WO2003084045A1 - System and method for braking a motor of a propulsion unit - Google Patents

System and method for braking a motor of a propulsion unit Download PDF

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Publication number
WO2003084045A1
WO2003084045A1 PCT/FI2003/000244 FI0300244W WO03084045A1 WO 2003084045 A1 WO2003084045 A1 WO 2003084045A1 FI 0300244 W FI0300244 W FI 0300244W WO 03084045 A1 WO03084045 A1 WO 03084045A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
propulsion unit
propeller
braking
short
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/FI2003/000244
Other languages
French (fr)
Inventor
Jari Ylitalo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Oy
Original Assignee
ABB Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP03712178A priority Critical patent/EP1488503B1/en
Priority to AU2003216754A priority patent/AU2003216754B2/en
Priority to US10/507,379 priority patent/US7218070B2/en
Priority to JP2003581337A priority patent/JP2005522170A/en
Priority to DK03712178T priority patent/DK1488503T3/en
Priority to KR1020047015283A priority patent/KR100968517B1/en
Application filed by ABB Oy filed Critical ABB Oy
Priority to DE60328976T priority patent/DE60328976D1/en
Priority to AT03712178T priority patent/ATE441242T1/en
Priority to CA2480255A priority patent/CA2480255C/en
Publication of WO2003084045A1 publication Critical patent/WO2003084045A1/en
Anticipated expiration legal-status Critical
Priority to NO20044660A priority patent/NO331291B1/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/22—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing
    • B63H23/24—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/13—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines using AC generators and AC motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/003—Dynamic electric braking by short circuiting the motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor
    • H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by short-circuit or resistive braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/32—Waterborne vessels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Definitions

  • the present invention relates to a propeller drive arrangement for vessels used in water-borne traffic and specifically to a propeller drive arrangement, which comprises a propulsion unit.
  • the invention further relates to an arrangement comprising a propulsion unit, which is rotatable in relation to the hull of the vessel.
  • the invention further relates to a system and a method for braking, i.e. reducing the speed and/or limiting the motion of a motor of a propulsion unit.
  • the drive device for the propeller shaft e.g. a diesel engine, a gas engine or an electric motor is provided inside the hull of the vessel, from which location the propeller shaft extends outside the hull of the vessel through a watertight sealed opening.
  • the propeller itself is located at the other end, i.e. the end extending outside the vessel, of the propeller shaft, which is connected either directly to the motor or to a gearbox, if any. In the majority of all vessels used in water- borne traffic this solution is used for providing the force necessary for their movement.
  • Figure 1 shows the structure of a propulsion unit according to prior art
  • Figure 2 shows a prior art propulsion unit with its turning arrangement
  • Figure 3 shows a prior art arrangement for supplying power to propulsion units.
  • FIG. 1 shows the structure of a propulsion unit according to prior art.
  • the prior art propulsion unit comprises a motor 1, a propeller 2, and a chamber 3, which is connected to the hull 5 of the ship by a hollow shaft 4.
  • Shipbuilders have lately started to provide vessels with propeller units of the described kind, wherein the motor 1, providing the driving power for the propeller shaft, as well as any gearbox, are disposed inside a special chamber 3, which is located outside the hull 5 of the ship, said chamber 3 being supported rotatably in relation to said hull 5.
  • the chamber 3, containing the motor 1, is rotatably supported in relation to the hull of the ship by the hollow shaft 4, which is extending through the bottom of the ship.
  • the unit is turnable relative the hull 5, whereby it, instead of any separate rudder equipment, can also be used for steering the vessel.
  • the FI patent No. 76977 discloses such a propulsion unit in more detail.
  • These units are also generally called azimuthing propulsion units, and the present applicant, for example, is offering such azimuthing units under the trade name AZIPOD ®.
  • these devices have been found to provide essential improvement in the maneuverability of a vessel.
  • the energy economy of the vessel has also been found to become more efficient.
  • the use of azimuthing propulsion units in various vessels for water-borne traffic has become more common, and they are assumed to grow increasingly popular.
  • FIG. 2 shows a prior art propulsion unit with its turning arrangement.
  • the propulsion unit according to prior art comprises a motor unit 6, a propeller 7, a supporting part 8, and a cabling unit 9 and motor units 10, 11 of the turning arrangement.
  • the motor unit 6 and the propeller 7 of the propulsion unit are being supported at the hull of the ship by the supporting part 8.
  • the driving electric power is supplied to the electric motor unit 6 by the cabling unit 9.
  • the motor units 10, 11 of the prior art turning arrangement turn the propulsion unit via a suitable gear set.
  • the prior art propulsion unit also comprises mechanical brake means for reducing and/or limiting the turning speed of the azimuthing propulsion unit.
  • FIG 3 shows a power supply arrangement according to prior art for propulsion units.
  • the prior art power supply arrangement for propulsion units comprises engine units 12, generator units 13, electrical power network switching panels 14, transformer units 15 for the propulsion system, frequency converters 16 for the propulsion units, frequency converters 17, 18 for the turning arrangement, propulsion units 19, 20 and a steering system 21.
  • the engine units 12 produce the power and the generator units 13 convert it to electric energy as input to the electrical power network.
  • the electric power is directed, via the switching panels 14 and the transformer units 15 for the propulsion system, to the frequency converters 16 for the propulsion units and the frequency converters 17, 18 for the turning arrangement.
  • the frequency converters 16-18 further establish the driving voltages to the motors for the propellers and the turning arrangements of the propulsion units 19, 20.
  • the task of the steering system 21 is to control the operation of the turning arrangement.
  • the operating principle of the frequency converter 16-18 is a technique known to a person skilled in the art, and thus it need not be explained here, except by mentioning, that the main general parts of a frequency converter are a rectifier, an intermediate direct-current circuit and an invertor.
  • frequency converters 16-18 are commonly used, for instance, as supply devices for alternating-current motors, while being particularly preferable in various controllable electric drives.
  • Frequency converters called P M frequency converters (PWM, pulse width modulation) which are based on the pulse width modulation technique and have a so called voltage intermediate circuit, are the frequency converters being utilized the most frequently.
  • braking means operating mechanically have been devised.
  • the object of the braking means is to prevent rotation of the propeller and to restrain the propeller essentially in a standard position or, respectively, to prevent the turning movement of the propulsion unit and to restrain the propulsion unit essentially in a standard position.
  • the object of the present invention is to eliminate the disadvantages of prior art and to provide a novel solution for reducing and/or limiting the speed of a motor of a propulsion unit.
  • An object of the invention is to provide a solution, in which the use of any separate mechanical brake means and problems related to such means will be avoided.
  • An object of the invention is to provide a solution, in which the use of any separate mechanical brake means, as the propulsion unit is recklessly turning, can be avoided.
  • An object of the invention is to provide a solution, by which the reliability and the overall economy of the turning ma- chinery of an azimuthing propulsion unit are improved compared to the known solutions.
  • a system for reducing the speed and/or limiting the motion of a motor of a propulsion unit, said system comprising a propulsion unit, a propeller, a propeller motor, said propeller motor containing a magnetization device, and a frequency converter connected to an electrical power network, the system being characterized in, that the system further comprises a switch arrangement, which switch arrangement comprises means for disconnecting the propeller motor from the electrical power network and means for essentially short-circuiting the stator windings of the propeller motor.
  • the propeller motor when a need for braking the propeller motor is detected, first, the propeller motor is disconnected from the electrical power network, after which the stator windings of the propeller motor are switched into a short-circuit.
  • the propeller motor is disconnected from the electrical power network, after which the stator windings of the propeller motor are switched into a short-circuit within the frequency converter.
  • the short-circuit is switched using semiconductors.
  • the short-circuit is implemented such, that the stator windings of the propeller motor simultaneously are also connected to equipment ground.
  • the switch arrangement is controlled by a control section of the frequency converter.
  • a synchronous motor is used as the propeller motor of the propulsion unit.
  • the braking system is implemented for switching more than one propulsion unit.
  • a system for reducing the speed and/or limiting the motion of a motor of a propulsion unit, said system comprising a propulsion unit, a propeller, motor units of the turning arrangement, said motor units containing a magnetization device, and a frequency converter connected to an electrical power network, the system being characterized in, that the system further comprises a switch arrangement, which switch arrangement comprises means for disconnecting the motor units from the electrical power network and means for essentially short-circuiting the stator windings of motor units.
  • the motor units are disconnected from the electrical power network, after which the stator windings of the motor units are switched into a short-circuit.
  • the motor units are disconnected from the electrical power network, after which the stator windings of the motor units are switched into a short-circuit within the frequency converter.
  • the short-circuit is switched using semiconductors .
  • the short-circuit is implemented such, that the stator windings of the motor units simultaneously are also connected to equipment ground.
  • the switch arrangement is controlled by a control section of the frequency converter.
  • synchronous motors are used as the motor units of the turning arrangement of the propulsion unit.
  • the braking system is implemented for switching more than one propulsion unit.
  • a method for reducing the speed and/or limiting the motion of a motor of a propulsion unit in a system comprising a propulsion unit, a propeller, a propeller motor, said propeller motor containing a magnetization device, and a frequency converter connected to an electrical power network, and a switch arrangement, the method being characterized in that first, a need for braking a propeller motor is detected, next, the propeller motor is disconnected from the electrical power network, after which the stator windings of the propeller motor are short-circuited.
  • the braking method is implemented for switching more than one propulsion unit.
  • a method for reducing the speed and/or limiting the motion of a motor of a propulsion unit in a system comprising a propulsion unit, a propeller, motor units of the turning arrangement, said motor units containing a magnetization device, and a frequency converter connected to an electrical power network, and a switch arrangement, the method being characterized in that first, a need for braking motor units is detected, next, the motor units are disconnected from the elec- trical power network, after which the stator windings of the motor units are short-circuited.
  • the braking method is implemented for switching more than one propulsion unit.
  • Figure 1 shows the structure of a propulsion unit according to prior art
  • Figure 2 shows a prior art propulsion unit and its turning arrangement
  • Figure 3 shows a prior art power supply arrangement for propulsion units
  • Figure 4 shows a system according to the present invention for braking a motor of a propulsion unit
  • Figure 5 shows a typical short-circuit curve for a permanently magnetized motor of a propulsion unit according to the present invention
  • Figure 6 shows an alternative system according to the present invention for braking a motor of a propulsion unit
  • Figure 7 shows a method according to the present invention for braking a motor of a propulsion unit
  • Figure 8 shows an alternative method according to the present invention for braking a motor of a propulsion unit
  • Figure 9 shows another alternative method according to the present invention for braking a motor of a propulsion unit.
  • FIG. 4 shows a system according to the present invention for braking a motor of a propulsion unit.
  • the braking system for a motor of a propulsion unit according to the invention comprises a load 22 of the propulsion unit, a permanently magnetized motor 23 of the propulsion unit, a frequency converter 25 connected to an electrical power network 24, and a switch arrangement 26.
  • the load 22 there may be either a propeller 22 or a turning device 22 for the propulsion unit.
  • Reference number 27 indicates a control section of the frequency converter.
  • the switch arrangement 26, according to the present invention, of the braking system for the motor of the propulsion unit comprises means for disconnecting the motor 23 from the electrical power network, and means for short-circuiting the stator windings of the permanently magnetized motor 23.
  • the short-circuit can also be implemented such, that the stator windings of the motor 23 simultaneously are connected to equipment ground.
  • the switch arrangement 26 can be controlled e.g. by the control section 27 of the frequency converter.
  • a synchronous motor 23 can be utilized as the permanently magnetized motor 23 of the propulsion unit.
  • the motor units 10, 11 of the turning arrangement can, for example, also constitute the permanently magnetized motors 23.
  • the braking method, according to the present invention, for a motor of a propulsion unit can also be implemented for switching more than one motor.
  • Figure 5 shows a typical short-circuit curve of a permanently magnetized motor of a propulsion unit according to the present invention.
  • the short-circuit curve of the motor is indicated by the reference numeral 28.
  • the stator windings of the permanently magnetized motor are short-circuited, the short-circuit moment is so large, that it is generously sufficient for resisting the moments induced by the ship's movements and sea currents. Thus at all times one stays to the left of the moment curve's peak value.
  • the rotational speed of the propeller is then less than 10 % of its nominal speed, typically about 2 - 5 % of the nominal speed.
  • Figure 6 shows an alternative system, according to the present invention, for braking a motor of a propulsion unit.
  • the alternative braking system, according to the present invention, for a motor of a propulsion unit comprises a propeller 29, a permanently magnetized motor 30 of the propulsion unit, a frequency converter 32 connected to an electrical power network 31, and a switch arrangement 33.
  • a control section of the frequency converter is indicated by the reference numeral 34.
  • the switch arrangement 33 of the braking system, according to the present invention, for a motor of a propulsion unit comprises means for disconnecting the motor 30 from the electrical power network and means for short-circuiting the stator windings of the permanently magnetized motor 30.
  • the motor 30 is disconnected from the electrical power network.
  • the stator windings of the permanently magnetized motor 30 are switched into a short-circuit within the frequency converter 32.
  • the short-circuit implemented within the frequency converter can be switched also using semiconductors.
  • a synchronous motor 30 can be used as the permanently magnetized motor 30 of the propulsion unit.
  • the short-circuit can also be implemented such, that the stator windings of the motor 30 simultaneously are connected to equipment ground.
  • the switch arrangement 33 can be controlled, for example, by a control section 34 of the frequency converter.
  • the motor units 10, 11 of the turning arrangement, for example, can here also constitute the permanently magnetized motors 30.
  • the braking system, according to the present invention, for a motor of a propulsion unit can also be implemented for switching more than one propulsion unit.
  • Figure 7 shows a method according to the present invention for braking a motor of a propulsion unit.
  • the braking system for a motor of a propulsion unit according to the invention comprises a propeller, a permanently magnetized motor of the propulsion unit, a frequency converter connected to an electrical power network, and a switch arrangement.
  • a need for braking the motor is detected 35.
  • the motor is disconnected 36 from the electrical power network.
  • the stator windings of the motor are short-circuited 37.
  • the method for braking a motor of a propulsion unit according to the present invention can also be implemented for switching more than one motor.
  • FIG 8 shows an alternative method, according to the present invention, for braking a motor of a propulsion unit.
  • the braking system for a motor of a propulsion unit according to the invention comprises a propeller, a permanently magnetized motor of. the propulsion unit, a frequency converter connected to an electrical power network, and a switch arrangement.
  • a need for braking the motor is detected 35.
  • the motor is disconnected 36 from the electrical power network.
  • the disconnection of the motor from the electrical power network is checked 38.
  • the stator windings of the motor are short- circuited 37.
  • the method for braking a motor of a propulsion unit, according to the present invention can also be implemented for switching more than one propulsion unit.
  • Figure 9 shows another alternative method, according to the present invention, for braking a motor of a propulsion unit.
  • the braking system for a motor of a propulsion unit according to the invention comprises a propeller, a permanently magnetized motor of the propulsion unit, a frequency converter connected to an electrical power network, and a switch arrangement.
  • the motor units 10, 11 of the turning arrangement for example, can here also constitute the permanently magnetized motors.
  • absence of supply power to the motor is detected 39.
  • the stator windings of the motor are short-circuited 40.
  • the alternative method for braking a motor of a propulsion unit according to the present invention can also be implemented for switching more than one propulsion unit.
  • a device and a method have been provided by the present invention, by which a novel solution for braking a motor of a propulsion unit of a vessel is achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Stopping Of Electric Motors (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Control Of Multiple Motors (AREA)
  • Valve Device For Special Equipments (AREA)
  • Braking Arrangements (AREA)
  • Regulating Braking Force (AREA)
  • Control Of Electric Motors In General (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of Ac Motors In General (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)

Abstract

The present invention relates to a propeller drive arrangement for vessels used in water-borne traffic, and specifically to a propeller drive arrangement containing a propulsion unit, and to such an arrangement, which contains a propulsion unit, which is turnable relative the hull of the vessel. Particularly the present invention relates to a system and a method for braking a motor of a propulsion unit. The solution for braking the propulsion unit according to the present invention is based on short-circuiting a permanently magnetized motor.

Description

System and method for braking a motor of a propulsion unit
Field of the invention
The present invention relates to a propeller drive arrangement for vessels used in water-borne traffic and specifically to a propeller drive arrangement, which comprises a propulsion unit. The invention further relates to an arrangement comprising a propulsion unit, which is rotatable in relation to the hull of the vessel. The invention further relates to a system and a method for braking, i.e. reducing the speed and/or limiting the motion of a motor of a propulsion unit.
Background of the present invention
In the most common cases the propulsion of various ships or equivalent vessels (such as e.g. passenger ships and passenger ferries, cargo ships, barges, oil tankers, ice breakers, off-shore vessels, naval ships etc.) is achieved by a pushing or pulling force produced by a rotatable propeller or several propellers. Separate rudder devices have conventionally been used for steering the vessels.
Conventionally the driving or rotating arrangements for the propellers have been implemented such, that the drive device for the propeller shaft, e.g. a diesel engine, a gas engine or an electric motor is provided inside the hull of the vessel, from which location the propeller shaft extends outside the hull of the vessel through a watertight sealed opening. The propeller itself is located at the other end, i.e. the end extending outside the vessel, of the propeller shaft, which is connected either directly to the motor or to a gearbox, if any. In the majority of all vessels used in water- borne traffic this solution is used for providing the force necessary for their movement.
Prior art is described below with reference to the accompanying drawings, in which:
Figure 1 shows the structure of a propulsion unit according to prior art, Figure 2 shows a prior art propulsion unit with its turning arrangement, and Figure 3 shows a prior art arrangement for supplying power to propulsion units.
Figure 1 shows the structure of a propulsion unit according to prior art. The prior art propulsion unit comprises a motor 1, a propeller 2, and a chamber 3, which is connected to the hull 5 of the ship by a hollow shaft 4. Shipbuilders have lately started to provide vessels with propeller units of the described kind, wherein the motor 1, providing the driving power for the propeller shaft, as well as any gearbox, are disposed inside a special chamber 3, which is located outside the hull 5 of the ship, said chamber 3 being supported rotatably in relation to said hull 5.
The chamber 3, containing the motor 1, is rotatably supported in relation to the hull of the ship by the hollow shaft 4, which is extending through the bottom of the ship. Thus, the unit is turnable relative the hull 5, whereby it, instead of any separate rudder equipment, can also be used for steering the vessel. Among others, the FI patent No. 76977, to the present applicant, discloses such a propulsion unit in more detail. These units are also generally called azimuthing propulsion units, and the present applicant, for example, is offering such azimuthing units under the trade name AZIPOD ®. In addition to the advantages gained from the elimination of a long propeller shaft and separate rudder equipment, these devices have been found to provide essential improvement in the maneuverability of a vessel. The energy economy of the vessel has also been found to become more efficient. In recent years, the use of azimuthing propulsion units in various vessels for water-borne traffic has become more common, and they are assumed to grow increasingly popular.
Figure 2 shows a prior art propulsion unit with its turning arrangement. The propulsion unit according to prior art comprises a motor unit 6, a propeller 7, a supporting part 8, and a cabling unit 9 and motor units 10, 11 of the turning arrangement. The motor unit 6 and the propeller 7 of the propulsion unit are being supported at the hull of the ship by the supporting part 8. The driving electric power is supplied to the electric motor unit 6 by the cabling unit 9. The motor units 10, 11 of the prior art turning arrangement turn the propulsion unit via a suitable gear set. The prior art propulsion unit also comprises mechanical brake means for reducing and/or limiting the turning speed of the azimuthing propulsion unit.
Figure 3 shows a power supply arrangement according to prior art for propulsion units. The prior art power supply arrangement for propulsion units comprises engine units 12, generator units 13, electrical power network switching panels 14, transformer units 15 for the propulsion system, frequency converters 16 for the propulsion units, frequency converters 17, 18 for the turning arrangement, propulsion units 19, 20 and a steering system 21. In the power supply system according to prior art, the engine units 12 produce the power and the generator units 13 convert it to electric energy as input to the electrical power network. In the electrical power network, the electric power is directed, via the switching panels 14 and the transformer units 15 for the propulsion system, to the frequency converters 16 for the propulsion units and the frequency converters 17, 18 for the turning arrangement. The frequency converters 16-18 further establish the driving voltages to the motors for the propellers and the turning arrangements of the propulsion units 19, 20. The task of the steering system 21 is to control the operation of the turning arrangement.
The operating principle of the frequency converter 16-18 is a technique known to a person skilled in the art, and thus it need not be explained here, except by mentioning, that the main general parts of a frequency converter are a rectifier, an intermediate direct-current circuit and an invertor. Presently frequency converters 16-18 are commonly used, for instance, as supply devices for alternating-current motors, while being particularly preferable in various controllable electric drives. Frequency converters called P M frequency converters (PWM, pulse width modulation) , which are based on the pulse width modulation technique and have a so called voltage intermediate circuit, are the frequency converters being utilized the most frequently.
Should one or more of the propellers get damaged, it should be possible to move the vessel for service. The problem is, that should the vessel be moved, the damaged propeller will easily start rotating and causes additional damage to the propulsion device and possibly also to the vessel. Accordingly, should there occur a break-down in the electric power supply to the motors in the turning arrangement for the propulsion unit, a sudden turning of the propulsion unit might cause additional damage to the propulsion device and possibly also to the vessel. If the propulsion device is free recklessly to turn this way and that, the maneuverability of the vessel is considerably impaired.
In propulsion units according to prior art, braking means operating mechanically have been devised. The object of the braking means is to prevent rotation of the propeller and to restrain the propeller essentially in a standard position or, respectively, to prevent the turning movement of the propulsion unit and to restrain the propulsion unit essentially in a standard position.
Summary of the present invention
The object of the present invention is to eliminate the disadvantages of prior art and to provide a novel solution for reducing and/or limiting the speed of a motor of a propulsion unit.
An object of the invention is to provide a solution, in which the use of any separate mechanical brake means and problems related to such means will be avoided.
An object of the invention is to provide a solution, in which the use of any separate mechanical brake means, as the propulsion unit is recklessly turning, can be avoided.
An object of the invention is to provide a solution, by which the reliability and the overall economy of the turning ma- chinery of an azimuthing propulsion unit are improved compared to the known solutions.
According to a first aspect of the present invention a system is provided for reducing the speed and/or limiting the motion of a motor of a propulsion unit, said system comprising a propulsion unit, a propeller, a propeller motor, said propeller motor containing a magnetization device, and a frequency converter connected to an electrical power network, the system being characterized in, that the system further comprises a switch arrangement, which switch arrangement comprises means for disconnecting the propeller motor from the electrical power network and means for essentially short-circuiting the stator windings of the propeller motor.
Preferably, when a need for braking the propeller motor is detected, first, the propeller motor is disconnected from the electrical power network, after which the stator windings of the propeller motor are switched into a short-circuit. Alternatively, when a need for braking the propeller motor is detected, first, the propeller motor is disconnected from the electrical power network, after which the stator windings of the propeller motor are switched into a short-circuit within the frequency converter. Preferably the short-circuit is switched using semiconductors.
Preferably, the short-circuit is implemented such, that the stator windings of the propeller motor simultaneously are also connected to equipment ground. Preferably, the switch arrangement is controlled by a control section of the frequency converter. Preferably, a synchronous motor is used as the propeller motor of the propulsion unit. Preferably, the braking system is implemented for switching more than one propulsion unit.
According to another aspect of the invention, a system is provided for reducing the speed and/or limiting the motion of a motor of a propulsion unit, said system comprising a propulsion unit, a propeller, motor units of the turning arrangement, said motor units containing a magnetization device, and a frequency converter connected to an electrical power network, the system being characterized in, that the system further comprises a switch arrangement, which switch arrangement comprises means for disconnecting the motor units from the electrical power network and means for essentially short-circuiting the stator windings of motor units.
Preferably, when a need for braking the motor units is detected, first, the motor units are disconnected from the electrical power network, after which the stator windings of the motor units are switched into a short-circuit. Alternatively, when a need for braking the motor units is detected, first, the motor units are disconnected from the electrical power network, after which the stator windings of the motor units are switched into a short-circuit within the frequency converter. Preferably the short-circuit is switched using semiconductors .
Preferably, the short-circuit is implemented such, that the stator windings of the motor units simultaneously are also connected to equipment ground. Preferably, the switch arrangement is controlled by a control section of the frequency converter. Preferably, synchronous motors are used as the motor units of the turning arrangement of the propulsion unit. Preferably, the braking system is implemented for switching more than one propulsion unit.
According to a third aspect of the invention, a method is provided for reducing the speed and/or limiting the motion of a motor of a propulsion unit in a system comprising a propulsion unit, a propeller, a propeller motor, said propeller motor containing a magnetization device, and a frequency converter connected to an electrical power network, and a switch arrangement, the method being characterized in that first, a need for braking a propeller motor is detected, next, the propeller motor is disconnected from the electrical power network, after which the stator windings of the propeller motor are short-circuited.
Preferably, before the stator windings of the propeller motor are short-circuited, a check is made to ensure, that the propeller motor is disconnected from the electrical power network. Preferably, the braking method is implemented for switching more than one propulsion unit.
According to a fourth aspect of the invention a method is provided for reducing the speed and/or limiting the motion of a motor of a propulsion unit in a system comprising a propulsion unit, a propeller, motor units of the turning arrangement, said motor units containing a magnetization device, and a frequency converter connected to an electrical power network, and a switch arrangement, the method being characterized in that first, a need for braking motor units is detected, next, the motor units are disconnected from the elec- trical power network, after which the stator windings of the motor units are short-circuited.
Preferably, before the stator windings of the motor units are short-circuited, a check is made to ensure, that the motor units are disconnected from the electrical power network. Preferably, the braking method is implemented for switching more than one propulsion unit.
Several considerable advantages are achieved by the present invention. It enables the replacement of the known system based on the use of mechanical brake means and thus the elimination of the problem items mentioned above. There is good overall economy in the solution based on utilizing the electric motor. The braking arrangement based on the electric drive is also extremely reliable.
The basic elements needed for the braking solution based on the use of an electric motor already exist in modern vessels, and, accordingly, the construction of a separate mechanical braking system is avoided.
Brief description of the drawings
The present invention is described below in detail with reference to the accompanying figures, in which: Figure 1 shows the structure of a propulsion unit according to prior art, Figure 2 shows a prior art propulsion unit and its turning arrangement, Figure 3 shows a prior art power supply arrangement for propulsion units, Figure 4 shows a system according to the present invention for braking a motor of a propulsion unit,
Figure 5 shows a typical short-circuit curve for a permanently magnetized motor of a propulsion unit according to the present invention,
Figure 6 shows an alternative system according to the present invention for braking a motor of a propulsion unit,
Figure 7 shows a method according to the present invention for braking a motor of a propulsion unit,
Figure 8 shows an alternative method according to the present invention for braking a motor of a propulsion unit, and
Figure 9 shows another alternative method according to the present invention for braking a motor of a propulsion unit.
Figures 1 - 3 were described above . The solution according to the present invention is presented below with reference to Figures 4 - 9, which show the implementation of a solution according to the present invention.
Detailed description of specific embodiments
Figure 4 shows a system according to the present invention for braking a motor of a propulsion unit. The braking system for a motor of a propulsion unit according to the invention comprises a load 22 of the propulsion unit, a permanently magnetized motor 23 of the propulsion unit, a frequency converter 25 connected to an electrical power network 24, and a switch arrangement 26. As the load 22 there may be either a propeller 22 or a turning device 22 for the propulsion unit. Reference number 27 indicates a control section of the frequency converter.
The switch arrangement 26, according to the present invention, of the braking system for the motor of the propulsion unit comprises means for disconnecting the motor 23 from the electrical power network, and means for short-circuiting the stator windings of the permanently magnetized motor 23. When a need for braking the motor 23 is detected, first the motor 23 is disconnected from the electrical power network. Subsequently he stator windings of the motor 23 are switched into a short-circuit. The short-circuit can also be implemented such, that the stator windings of the motor 23 simultaneously are connected to equipment ground.
The switch arrangement 26 can be controlled e.g. by the control section 27 of the frequency converter. For example a synchronous motor 23 can be utilized as the permanently magnetized motor 23 of the propulsion unit. The motor units 10, 11 of the turning arrangement can, for example, also constitute the permanently magnetized motors 23. The braking method, according to the present invention, for a motor of a propulsion unit can also be implemented for switching more than one motor.
Figure 5 shows a typical short-circuit curve of a permanently magnetized motor of a propulsion unit according to the present invention. The short-circuit curve of the motor is indicated by the reference numeral 28. When the stator windings of the permanently magnetized motor are short-circuited, the short-circuit moment is so large, that it is generously sufficient for resisting the moments induced by the ship's movements and sea currents. Thus at all times one stays to the left of the moment curve's peak value. The rotational speed of the propeller is then less than 10 % of its nominal speed, typically about 2 - 5 % of the nominal speed.
Figure 6 shows an alternative system, according to the present invention, for braking a motor of a propulsion unit. The alternative braking system, according to the present invention, for a motor of a propulsion unit comprises a propeller 29, a permanently magnetized motor 30 of the propulsion unit, a frequency converter 32 connected to an electrical power network 31, and a switch arrangement 33. A control section of the frequency converter is indicated by the reference numeral 34.
The switch arrangement 33 of the braking system, according to the present invention, for a motor of a propulsion unit comprises means for disconnecting the motor 30 from the electrical power network and means for short-circuiting the stator windings of the permanently magnetized motor 30. When a need for braking the motor 30 is detected, first, the motor 30 is disconnected from the electrical power network. After that, the stator windings of the permanently magnetized motor 30 are switched into a short-circuit within the frequency converter 32.
The short-circuit implemented within the frequency converter can be switched also using semiconductors. For example, a synchronous motor 30 can be used as the permanently magnetized motor 30 of the propulsion unit. The short-circuit can also be implemented such, that the stator windings of the motor 30 simultaneously are connected to equipment ground. The switch arrangement 33 can be controlled, for example, by a control section 34 of the frequency converter. The motor units 10, 11 of the turning arrangement, for example, can here also constitute the permanently magnetized motors 30. The braking system, according to the present invention, for a motor of a propulsion unit can also be implemented for switching more than one propulsion unit.
Figure 7 shows a method according to the present invention for braking a motor of a propulsion unit. The braking system for a motor of a propulsion unit according to the invention comprises a propeller, a permanently magnetized motor of the propulsion unit, a frequency converter connected to an electrical power network, and a switch arrangement. In the method according to the present invention, first, a need for braking the motor is detected 35. When the need for braking has been detected, the motor is disconnected 36 from the electrical power network. After that, the stator windings of the motor are short-circuited 37. The method for braking a motor of a propulsion unit according to the present invention can also be implemented for switching more than one motor.
Figure 8 shows an alternative method, according to the present invention, for braking a motor of a propulsion unit. The braking system for a motor of a propulsion unit according to the invention comprises a propeller, a permanently magnetized motor of. the propulsion unit, a frequency converter connected to an electrical power network, and a switch arrangement. In the method according to the present invention, first, a need for braking the motor is detected 35. When the need for braking has been detected, the motor is disconnected 36 from the electrical power network. After the motor has been disconnected from the electrical power network, the disconnection of the motor from the electrical power network is checked 38. After that, the stator windings of the motor are short- circuited 37. The method for braking a motor of a propulsion unit, according to the present invention, can also be implemented for switching more than one propulsion unit.
Figure 9 shows another alternative method, according to the present invention, for braking a motor of a propulsion unit. The braking system for a motor of a propulsion unit according to the invention comprises a propeller, a permanently magnetized motor of the propulsion unit, a frequency converter connected to an electrical power network, and a switch arrangement. The motor units 10, 11 of the turning arrangement, for example, can here also constitute the permanently magnetized motors. In the method according to the present invention, first, absence of supply power to the motor is detected 39. When absence of supply power has been detected, the stator windings of the motor are short-circuited 40. The alternative method for braking a motor of a propulsion unit according to the present invention can also be implemented for switching more than one propulsion unit.
Thus, a device and a method have been provided by the present invention, by which a novel solution for braking a motor of a propulsion unit of a vessel is achieved. By the solution, several disadvantages of prior art are avoided, while achieving an advantage with regard to a simpler design and a better overall economy as well as ease of use and operational reliability.
It is to be appreciated, that the examples of embodiments of the present invention presented above are not limiting the scope of the invention as defined in the patent claims, but rather that the claims are intended to cover all modifications, similarities and alternatives included in the spirit and scope of the invention as defined in the accompanying patent claims.

Claims

Patent claims
1. A system for reducing the speed and/or limiting the motion of a motor of a propulsion unit, said system comprising a propulsion unit, a propeller (22) , (29) , a propeller motor (23) , (30) , said propeller motor containing a magnetization device, and a frequency converter (25) , (32) connected to an electrical power network (24), (31), characterized in, that the system further comprises a switch arrangement (26) , (33) , which switch arrangement (26) , (33) comprises means for disconnecting the propeller motor (23), (30) from the electrical power network and means for essentially short-circuiting the stator windings of the propeller motor (23) , (30) .
2. A system according to claim 1, characterized in that when a need for braking the propeller motor (23) is detected, first, the propeller motor (23) is disconnected from the electrical power network, after which the stator windings of the propeller motor (23) are switched into a short-circuit.
3. A system according to claim 1, characterized in that when a need for braking the propeller motor (30) is detected, first, the propeller motor (30) is disconnected from the electrical power network, after which the stator windings of the propeller motor (30) are switched into a short-circuit within the frequency converter (32) .
4. A system according to claim 3, characterized in that the short-circuit is switched using semiconductors.
5. A system, according to claim 2, 3 or 4, characterized in that the short-circuit is implemented such, that the stator windings of the propeller motor (23) , (30) simultaneously are also connected to equipment ground.
6. A system according to any one of the preceding claims 2-
5, characterized in that the switch arrangement (26) , (33) is controlled by a control section (27), (34) of the frequency converter.
7. A system according to any one of the preceding claims 2-
6, characterized in, that a synchronous motor (23), (30) is used as the propeller motor (23), (30) of the propulsion unit .
8. A system according to any one of the preceding claims 1-
7, characterized in, that the braking system is implemented for switching more than one propulsion unit.
9. A system for reducing the speed and/or limiting the motion of a motor of a propulsion unit, said system comprising a propulsion unit, a propeller (22), (29), motor units (10), (11) of the turning arrangement, said motor units (10), (11) containing a magnetization device, and a frequency converter (25), (32) connected to an electrical power network (24), (31) , characterized in, that the system further comprises a switch arrangement (26) , (33) , which switch arrangement (26) , (33) comprises means for disconnecting the motor units (10), (11) from the electrical power network and means for essentially short-circuiting the stator windings of motor units (10), (11).
10. A system according to claim 9, characterized in that when a need for braking the motor units (10), (11) is detected, first, the motor units (10), (11) are disconnected from the electrical power network, after which the stator windings of the motor units (10) , (11) are switched into a short-circuit .
11. A system according to claim 9, characterized in that when a need for braking the motor units (10) , (11) is detected, first, the motor units (10) , (11) are disconnected from the electrical power network, after which the stator windings of the motor units (10) , (11) are switched into a short-circuit within the frequency converter (32) .
12. A system according to claim 11, characterized in that the short-circuit is switched using semiconductors.
13. A system, according to claim 10, 11 or 12, characterized in that the short-circuit is implemented such, that the stator windings of the motor units (10) , (11) simultaneously are also connected to equipment ground.
14. A system according to any one of the preceding claims 10-13, characterized in that the switch arrangement (26), (33) is controlled by a control section (27), (34) of the frequency converter.
15. A system according to any one of the preceding claims 10-14, characterized in, that synchronous motors (10), (11) are used as the motor units (10) , (11) of the turning arrangement of the propulsion unit.
16. A system according to any one of the preceding claims 9- 15, characterized in, that the braking system is implemented for switching more than one propulsion unit.
17. A method for reducing the speed and/or limiting the motion of a motor of a propulsion unit in a system comprising a propulsion unit, a propeller (22) , (29) , a propeller motor
(23), (30), said propeller motor containing a magnetization device, and a frequency converter (25) , (32) connected to an electrical power network (24), (31), and a switch arrangement (26) , (33) characterized in, that in the method according to the invention, first, a need for braking a propeller motor (23), (30) is detected (35), next, the propeller motor (23), (30) is disconnected (36) from the electrical power network (24), (31), after which the stator windings of the propeller motor (23), (30) are short-circuited (37).
18. A method according to claim 17, characterized in that before the stator windings of the propeller motor (23) , (30) are short-circuited (37), a check is made to ensure (38), that the propeller motor (23) , (30) is disconnected from the electrical power network.
19. Method, according to claim 17 or 18, characterized in that the braking method is implemented for switching more than one propulsion unit.
20. A method for reducing the speed and/or limiting the motion of a motor of a propulsion unit in a system comprising a propulsion unit, a propeller (22), (29), motor units (10),
(11) of the turning arrangement, said motor units (10) , (11) containing a magnetization device, and a frequency converter (25), (32) connected to an electrical power network (24), (31), and a switch arrangement (26), (33) characterized in, that in the method according to the invention, first, a need for braking motor units (10), (11) is detected (35), next, the motor units (10) , (11) are disconnected (36) from the electrical power network (24), (31), after which the stator windings of the motor units (10), (11) are short-circuited (37) .
21. A method according to claim 20, characterized in that before the stator windings of the motor units (10), (11) are short-circuited (37), a check is made to ensure (38), that the motor units (10) , (11) are disconnected from the electrical power network.
22. Method, according to claim 20 or 21, characterized in that the braking method is implemented for switching more than one propulsion unit.
PCT/FI2003/000244 2002-03-28 2003-03-28 System and method for braking a motor of a propulsion unit Ceased WO2003084045A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DE60328976T DE60328976D1 (en) 2002-03-28 2003-03-28 SYSTEM AND METHOD FOR BRAKING AN ENGINE OF A DRIVE UNIT
AU2003216754A AU2003216754B2 (en) 2002-03-28 2003-03-28 System and method for braking a motor of a propulsion unit
US10/507,379 US7218070B2 (en) 2002-03-28 2003-03-28 System and method for braking a motor of a propulsion unit
JP2003581337A JP2005522170A (en) 2002-03-28 2003-03-28 System and method for braking a motor of a propulsion unit
DK03712178T DK1488503T3 (en) 2002-03-28 2003-03-28 System and method of braking a motor in a drive unit
EP03712178A EP1488503B1 (en) 2002-03-28 2003-03-28 System and method for braking a motor of a propulsion unit
CA2480255A CA2480255C (en) 2002-03-28 2003-03-28 System and method for braking a motor of a propulsion unit
KR1020047015283A KR100968517B1 (en) 2002-03-28 2003-03-28 System and method for braking the motor of the propulsion unit
AT03712178T ATE441242T1 (en) 2002-03-28 2003-03-28 SYSTEM AND METHOD FOR BRAKING A MOTOR OF A DRIVE UNIT
NO20044660A NO331291B1 (en) 2002-03-28 2004-10-28 System and method for braking an engine of a propulsion unit

Applications Claiming Priority (2)

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FI20020619 2002-03-28
FI20020619A FI115393B (en) 2002-03-28 2002-03-28 Method and system for braking a propulsion unit engine

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EP (1) EP1488503B1 (en)
JP (1) JP2005522170A (en)
KR (1) KR100968517B1 (en)
CN (1) CN1643772A (en)
AT (1) ATE441242T1 (en)
AU (1) AU2003216754B2 (en)
CA (1) CA2480255C (en)
DE (1) DE60328976D1 (en)
DK (1) DK1488503T3 (en)
ES (1) ES2328030T3 (en)
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EP1488503A1 (en) 2004-12-22
ATE441242T1 (en) 2009-09-15
FI20020619A7 (en) 2003-09-29
US20050170716A1 (en) 2005-08-04
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NO331291B1 (en) 2011-11-21
KR100968517B1 (en) 2010-07-08
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FI20020619A0 (en) 2002-03-28
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AU2003216754B2 (en) 2007-09-20
US7218070B2 (en) 2007-05-15
CA2480255A1 (en) 2003-10-09
CA2480255C (en) 2012-01-10
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NO20044660L (en) 2004-10-28
RU2301173C2 (en) 2007-06-20

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