WO2015105510A1 - Drive unit for multiphase permanent magnet synchronous motor - Google Patents

Drive unit for multiphase permanent magnet synchronous motor Download PDF

Info

Publication number
WO2015105510A1
WO2015105510A1 PCT/US2014/011264 US2014011264W WO2015105510A1 WO 2015105510 A1 WO2015105510 A1 WO 2015105510A1 US 2014011264 W US2014011264 W US 2014011264W WO 2015105510 A1 WO2015105510 A1 WO 2015105510A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase
drive
drives
windings
conveyance system
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/US2014/011264
Other languages
French (fr)
Inventor
Zbigniew Piech
Cezary JEDRYCZKA
Wojciech Szelag
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.)
Otis Elevator Co
Original Assignee
Otis Elevator Co
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
Application filed by Otis Elevator Co filed Critical Otis Elevator Co
Priority to EP14877715.4A priority Critical patent/EP3095184A4/en
Priority to US15/111,028 priority patent/US9932204B2/en
Priority to CN201910603551.XA priority patent/CN110492825A/en
Priority to CN201480073036.0A priority patent/CN105917572B/en
Priority to HK16112700.8A priority patent/HK1224437B/en
Priority to PCT/US2014/011264 priority patent/WO2015105510A1/en
Publication of WO2015105510A1 publication Critical patent/WO2015105510A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
    • B66B11/04—Driving gear ; Details thereof, e.g. seals
    • B66B11/0407—Driving gear ; Details thereof, e.g. seals actuated by an electrical linear motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
    • B66B1/28—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/22—Multiple windings; Windings for more than three phases
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/04—Machines with one rotor and two stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/12—Machines characterised by the modularity of some components

Definitions

  • the subject matter disclosed herein relates generally to drive units, and more particularly to a drive unit for use with a multiphase permanent magnet synchronous motor for use in a conveyance system.
  • Conveyance systems such as elevator systems, use machines to impart force to a car carrying passengers.
  • the machines employed may need to provide varying power levels depending on the application. For example, an elevator for hoisting larger loads requires a higher power machine.
  • the machines are driven by a drive unit having electrical power requirements meeting the machine load requirements.
  • a high power drive unit needs to be developed or sourced, and tested for proper operation (e.g., certified). The process of selecting a specific drive unit for each machine load is time consuming and costly.
  • a conveyance system includes a car; a machine for imparting motion to the car, the machine including a stator and a rotor, the stator including 12*k stator teeth, the rotor including l l*k rotor poles, wherein k is a natural even number, the machine including windings located at the stator teeth, the windings arranged in 6 phases; and a drive unit for providing drive signals to the machine, the drive unit including a plurality of drives, the number of drives being an integer multiple of 2.
  • the windings associated with each phase and coupled to a common drive are arranged in electrical series
  • the windings associated with each phase and coupled to a common drive are arranged in electrically parallel branches, each branch include windings arranged in electrical series.
  • the windings associated with each phase and coupled to a common drive are arranged in electrical parallel.
  • the number of drives equals 2.
  • the number of drives equals 4.
  • the drives include a first drive and a second drive, the first drive generating drive signals of a first phase, second phase and third phase, the second drive generating drive signals of a fourth phase, fifth phase and sixth phase.
  • the first phase and fourth phase are offset by an angle of 30 degrees.
  • the car is an elevator car.
  • a conveyance system includes a car; a machine for imparting motion to the car, the machine including a stator and a rotor, the stator including 18*k stator teeth, the rotor including 17*k rotor poles, wherein k is a natural even number, the machine including windings located at the stator teeth, the windings arranged in 9 phases; and a drive unit for providing drive signals to the machine, the drive unit including a plurality of drives, the number of drives being an integer multiple of 3.
  • the windings associated with each phase and coupled to a common drive are arranged in electrical series.
  • each phase and coupled to a common drive are arranged in electrically parallel branches, each branch include windings arranged in electrical series.
  • the windings associated with each phase and coupled to a common drive are arranged in electrical parallel.
  • the number of drives equals 3.
  • the number of drives equals 6.
  • the drives include a first drive and a second drive, the first drive generating drive signals of a first phase, second phase and third phase, the second drive generating drive signals of a fourth phase, fifth phase and sixth phase.
  • the first phase and fourth phase are offset by an angle of 40 degrees.
  • the drives include a third drive, the third drive generating drive signals of a seventh phase, eighth phase and ninth phase.
  • the first phase and seventh phase are offset by an angle of 80 degrees.
  • the car is an elevator car.
  • FIG. 1 is a block diagram of components of an elevator system in an exemplary embodiment
  • FIG. 2 depicts a stator and rotor in an exemplary embodiment
  • FIG. 3 depicts stator teeth in an exemplary embodiment
  • FIGs. 4-6 depict windings of a 6 phase permanent magnet synchronous motor coupled to 2 drives in exemplary embodiments
  • FIGs. 7-8 depict windings of a 6 phase permanent magnet synchronous motor coupled to 4 drives in exemplary embodiments
  • FIG. 9 depicts stator teeth in an exemplary embodiment
  • FIGs. 10-12 depict windings of a 9 phase permanent magnet synchronous motor coupled to 3 drives in exemplary embodiments.
  • FIGs. 13-14 depict windings of a 9 phase permanent magnet synchronous motor coupled to 6 drives in exemplary embodiments.
  • FIG. 1 is a block diagram of components of an elevator system 10 in an exemplary embodiment.
  • Elevator system 10 includes a source of AC power 12, such as an electrical main line (e.g., 440 volt, 3-phase).
  • the AC power 12 is provided to a drive unit 20.
  • Drive unit 20 includes a plurality of drives, with each drive generating drive signals arranged in three phrases.
  • Each drive may include a rectifier to convert the AC power 12 to a DC voltage.
  • Each drive may include an inverter to convert the DC voltage to multiphase, AC drive signals.
  • Drive signals from the drive unit 20 are supplied to a multiphase machine 22 to impart motion to elevator car 23.
  • machine 22 is a multiphase, permanent magnet synchronous motor.
  • Various configurations of motor phases and drives are described in further detail herein.
  • a controller 24 provides control signals to the drives of drive unit 20 to control generation of the drive signals.
  • Controller 24 may be implemented using a general- purpose microprocessor executing a computer program stored on a storage medium to perform the operations described herein.
  • controller 24 may be implemented in hardware (e.g., ASIC, FPGA) or in a combination of hardware/software. Controller 24 may also be part of an elevator control system.
  • FIG. 2 depicts a stator 30 and rotor 32 of machine 22 in an exemplary embodiment.
  • Stator 30 includes a plurality of stator teeth 34, upon each of which a phase winding is wound as described herein.
  • Rotor 32 includes a plurality of permanent magnets 36, defining rotor poles.
  • stator 30 has 48 stator teeth and rotor 32 has 44 rotor poles.
  • Embodiments of a 6 phase machine 22 include machines having 12*k stator teeth and l l*k rotor poles (where k is natural even number, e.g. 2, 4, 6, . . .).
  • FIG. 3 depicts a 12-tooth section of a stator having 48 stator teeth.
  • machine 22 is a 6 phase, permanent magnet synchronous motor.
  • the six phases in FIG. 3 are represented by letters, where ABCDEF correspond to positive windings for each phase and ABCDEF correspond to negative windings for each phase.
  • the pattern of windings in FIG. 3 is AA EE BB FF CC DD, where letters A-F correspond to six phases.
  • the pattern of windings in the next 12 stator teeth is electrically reversed, i.e., AA EE BB FF CC DD.
  • FIG. 4 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 2 galvanic separated 3 phase drives.
  • a first drive 40 of drive unit 20, generates three phase drive signals, ABC, with each phase separated by 120 degrees.
  • the windings are arranged such that all the windings associated with phase A are in series, all the windings associated with phase B are in series and all the windings associated with phase C are in series.
  • the windings arranged in series alternate polarity.
  • a second drive 42, of drive unit 20 generates three phase drive signals, DEF, with each phase separated by 120 degrees.
  • Phases DEF are offset from phases ABC, respectively, by an angle (e.g., 30 degrees).
  • the windings are arranged such that all the windings associated with phase D are in series, all the windings associated with phase E are in series and all the windings associated with phase F are in series.
  • the windings arranged in series alternate polarity.
  • FIG. 5 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 2 galvanic separated 3 phase drives.
  • Drives 40 and 42 are similar to those in FIG. 4.
  • windings for a respective phase are connected in two parallel branches, each branch having series connected windings. The windings arranged in series alternate polarity.
  • FIG. 6 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 2 galvanic separated 3 phase drives. Drives 40 and 42 are similar to those in FIG. 4. In the embodiment of FIG. 6, windings for a respective phase are connected in four parallel branches, each branch having a single positive-negative winding pair.
  • FIG. 7 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 4 galvanic separated 3 phase drives.
  • two drives 40 and 40' are used to generate drive signals for phases ABC.
  • Two drives 42 and 42' are used to generate drive signals for phases DEF. Windings of the same phase coupled to a common drive are connected in series.
  • Using two drives 40 and 40' for phases ABC and two drives 42 and 42' for phases DEF provides increased power over the embodiments of FIGs. 4-6, to handle higher loads.
  • FIG. 8 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 4 galvanic separated 3 phase drives.
  • two drives 40 and 40' are used to generate drive signals for phases ABC.
  • Two drives 42 and 42' are used to generate drive signals for phases DEF. Windings of the same phase coupled to a common drive are connected in parallel.
  • the above embodiments of FIGs. 4-8 relate to a 6 phase permanent magnetic synchronous motor coupled to a number of drives.
  • the number of drives in FIGs. 4-8 is 2 or 4, but in other embodiments the number of drives may be an integer multiple of 2.
  • Embodiments of a 9 phase machine 22 include machines having 18*k stator teeth and 17*k rotor poles (where k is natural even number, e.g., 2, 4, 6, . . .).
  • the stator includes 72 stator teeth and the rotor includes 68 poles.
  • FIG. 9 depicts an 18-tooth section of a stator having 72 stator teeth.
  • machine 22 is a 9 phase, permanent magnet synchronous motor.
  • the 9 phases in FIG. 9 are represented by letters, where ABCDEFGHI correspond to positive windings for each phase and ABCDEFGHI correspond to negative windings for each phase.
  • FIG. 10 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of 3 galvanic separated 3 phase drives.
  • all windings for a phase are connected in series.
  • a first drive 50, of drive unit 20, generates three phase drive signals, ABC, with each phase separated by 120 degrees.
  • the windings are arranged such that all the windings associated with phase A are in series, all the windings associated with phase B are in series and all the windings associated with phase C are in series.
  • the windings arranged in series alternate polarity.
  • a second drive 52, of drive unit 20 generates three phase drive signals, DEF, with each phase separated by 120 degrees.
  • Phases DEF are offset from phases ABC, respectively, by an angle (e.g., 40 degrees).
  • the windings are arranged all the windings associated with phase D are in series, all the windings associated with phase E are in series and all the windings associated with phase F are in series.
  • the windings arranged in series alternate polarity.
  • a third drive 54, of drive unit 20 generates three phase drive signals, GHI, with each phase separated by 120 degrees.
  • Phases GHI are offset from phases ABC, respectively, by an angle (e.g., 80 degrees).
  • the windings are arranged all the windings associated with phase G are in series, all the windings associated with phase H are in series and all the windings associated with phase I are in series.
  • FIG. 11 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of three galvanic separated three phase drives. Drives 50, 52 and 54 are similar to those in FIG. 10.
  • windings for a respective phase are connected in two parallel branches, each branch having series connected windings.
  • FIG. 12 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of 3 galvanic separated 3 phase drives.
  • Drives 50, 52 and 54 are similar to those in FIG. 10.
  • windings for a respective phase are connected in four parallel branches, each branch having a single positive-negative winding pair.
  • FIG. 13 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of 6 galvanic separated 3 phase drives.
  • two drives 50 and 50' are used to generate drive signals for phases ABC.
  • Two drives 52 and 52' are used to generate drive signals for phases DEF.
  • Two drives 54 and 54' are used to generate drive signals for phases GHI. Windings of the same phase coupled to a common drive are connected in series.
  • two drives 50 and 50' for phases ABC, two drives 52 and 52' for phases DEF and two drives 54 and 54' for phases GHI provides improved power over the embodiments of FIGs. 10-12, to handle higher loads.
  • Already existing drives are used to drive portions of the windings for a phase, eliminating the need to develop and certify drives with higher power.
  • FIG. 14 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of 6 galvanic separated 3 phase drives.
  • two drives 50 and 50' are used to generate drive signals for phases ABC.
  • Two drives 52 and 52' are used to generate drive signals for phases DEF.
  • Two drives 54 and 54' are used to generate drive signals for phases GHI. Windings of the same phase coupled to a common drive are connected in parallel.
  • FIGs. 10-14 relate to a 9 phase permanent magnetic synchronous motor coupled to a number of drives.
  • the number of drives in FIGs. 10-14 is 3 or 6, but in other embodiments the number of drives may be an integer multiple of 3.
  • Embodiments reduce cost for machines with higher load requirements. Using a plurality of drives rather than a single high power drive avoids costs of high power drive development. Using multiple drives provides redundancy. In case of one drive fails, the machine can still operate in a service mode with lower performance. Embodiments provide lower torque ripple which reduces noise and vibration levels. Embodiments provide lower content of magnetomotive force at higher harmonics, with a reduction of core losses and solid losses in the rotor of the machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Control Of Ac Motors In General (AREA)
  • Windings For Motors And Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

A conveyance system includes a car; a machine for imparting motion to the car, the machine including a stator and a rotor, the stator including 12*k stator teeth, the rotor including 11*k rotor poles, wherein k is a natural even number, the machine including windings located at the stator teeth, the windings arranged in 6 phases; and a drive unit for providing drive signals to the machine, the drive unit including a plurality of drives, the number of drives being an integer multiple of 2.

Description

DRIVE UNIT FOR MULTIPHASE PERMANENT MAGNET SYNCHRONOUS MOTOR
FIELD OF INVENTION
[0001] The subject matter disclosed herein relates generally to drive units, and more particularly to a drive unit for use with a multiphase permanent magnet synchronous motor for use in a conveyance system.
BACKGROUND
[0002] Conveyance systems, such as elevator systems, use machines to impart force to a car carrying passengers. The machines employed may need to provide varying power levels depending on the application. For example, an elevator for hoisting larger loads requires a higher power machine. The machines are driven by a drive unit having electrical power requirements meeting the machine load requirements. Typically, when a machine is required to handle higher loads, a high power drive unit needs to be developed or sourced, and tested for proper operation (e.g., certified). The process of selecting a specific drive unit for each machine load is time consuming and costly.
BRIEF SUMMARY
[0003] According to an exemplary embodiment, a conveyance system includes a car; a machine for imparting motion to the car, the machine including a stator and a rotor, the stator including 12*k stator teeth, the rotor including l l*k rotor poles, wherein k is a natural even number, the machine including windings located at the stator teeth, the windings arranged in 6 phases; and a drive unit for providing drive signals to the machine, the drive unit including a plurality of drives, the number of drives being an integer multiple of 2.
[0004] Alternatively or additionally in this or other embodiments, the windings associated with each phase and coupled to a common drive are arranged in electrical series
[0005] Alternatively or additionally in this or other embodiments, the windings associated with each phase and coupled to a common drive are arranged in electrically parallel branches, each branch include windings arranged in electrical series.
[0006] Alternatively or additionally in this or other embodiments, the windings associated with each phase and coupled to a common drive are arranged in electrical parallel.
[0007] Alternatively or additionally in this or other embodiments, the number of drives equals 2. [0008] Alternatively or additionally in this or other embodiments, the number of drives equals 4.
[0009] Alternatively or additionally in this or other embodiments, the drives include a first drive and a second drive, the first drive generating drive signals of a first phase, second phase and third phase, the second drive generating drive signals of a fourth phase, fifth phase and sixth phase.
[0010] Alternatively or additionally in this or other embodiments, the first phase and fourth phase are offset by an angle of 30 degrees.
[0011] Alternatively or additionally in this or other embodiments, the car is an elevator car.
[0012] According to an exemplary embodiment, a conveyance system includes a car; a machine for imparting motion to the car, the machine including a stator and a rotor, the stator including 18*k stator teeth, the rotor including 17*k rotor poles, wherein k is a natural even number, the machine including windings located at the stator teeth, the windings arranged in 9 phases; and a drive unit for providing drive signals to the machine, the drive unit including a plurality of drives, the number of drives being an integer multiple of 3.
[0013] Alternatively or additionally in this or other embodiments, the windings associated with each phase and coupled to a common drive are arranged in electrical series.
[0014] Alternatively or additionally in this or other embodiments, the windings associated with each phase and coupled to a common drive are arranged in electrically parallel branches, each branch include windings arranged in electrical series.
[0015] Alternatively or additionally in this or other embodiments, the windings associated with each phase and coupled to a common drive are arranged in electrical parallel.
[0016] Alternatively or additionally in this or other embodiments, the number of drives equals 3.
[0017] Alternatively or additionally in this or other embodiments, the number of drives equals 6.
[0018] Alternatively or additionally in this or other embodiments, the drives include a first drive and a second drive, the first drive generating drive signals of a first phase, second phase and third phase, the second drive generating drive signals of a fourth phase, fifth phase and sixth phase.
[0019] Alternatively or additionally in this or other embodiments, the first phase and fourth phase are offset by an angle of 40 degrees. [0020] Alternatively or additionally in this or other embodiments, the drives include a third drive, the third drive generating drive signals of a seventh phase, eighth phase and ninth phase.
[0021] Alternatively or additionally in this or other embodiments, the first phase and seventh phase are offset by an angle of 80 degrees.
[0022] Alternatively or additionally in this or other embodiments, the car is an elevator car.
[0023] Other aspects, features, and techniques of embodiments of the invention will become more apparent from the following description taken in conjunction with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Referring now to the drawings wherein like elements are numbered alike in the FIGURES:
[0025] FIG. 1 is a block diagram of components of an elevator system in an exemplary embodiment;
[0026] FIG. 2 depicts a stator and rotor in an exemplary embodiment;
[0027] FIG. 3 depicts stator teeth in an exemplary embodiment;
[0028] FIGs. 4-6 depict windings of a 6 phase permanent magnet synchronous motor coupled to 2 drives in exemplary embodiments;
[0029] FIGs. 7-8 depict windings of a 6 phase permanent magnet synchronous motor coupled to 4 drives in exemplary embodiments;
[0030] FIG. 9 depicts stator teeth in an exemplary embodiment;
[0031] FIGs. 10-12 depict windings of a 9 phase permanent magnet synchronous motor coupled to 3 drives in exemplary embodiments; and
[0032] FIGs. 13-14 depict windings of a 9 phase permanent magnet synchronous motor coupled to 6 drives in exemplary embodiments.
DETAILED DESCRIPTION
[0033] FIG. 1 is a block diagram of components of an elevator system 10 in an exemplary embodiment. Although embodiments are described with respect to an elevator system, it is understood that embodiments may be applied to other conveyance systems (e.g., trains, automobiles, marine). Elevator system 10 includes a source of AC power 12, such as an electrical main line (e.g., 440 volt, 3-phase). The AC power 12 is provided to a drive unit 20. Drive unit 20 includes a plurality of drives, with each drive generating drive signals arranged in three phrases. Each drive may include a rectifier to convert the AC power 12 to a DC voltage. Each drive may include an inverter to convert the DC voltage to multiphase, AC drive signals. Drive signals from the drive unit 20 are supplied to a multiphase machine 22 to impart motion to elevator car 23. In an exemplary embodiment, machine 22 is a multiphase, permanent magnet synchronous motor. Various configurations of motor phases and drives are described in further detail herein.
[0034] A controller 24 provides control signals to the drives of drive unit 20 to control generation of the drive signals. Controller 24 may be implemented using a general- purpose microprocessor executing a computer program stored on a storage medium to perform the operations described herein. Alternatively, controller 24 may be implemented in hardware (e.g., ASIC, FPGA) or in a combination of hardware/software. Controller 24 may also be part of an elevator control system.
[0035] FIG. 2 depicts a stator 30 and rotor 32 of machine 22 in an exemplary embodiment. Stator 30 includes a plurality of stator teeth 34, upon each of which a phase winding is wound as described herein. Rotor 32 includes a plurality of permanent magnets 36, defining rotor poles. In the embodiment of FIG. 2, stator 30 has 48 stator teeth and rotor 32 has 44 rotor poles. Embodiments of a 6 phase machine 22 include machines having 12*k stator teeth and l l*k rotor poles (where k is natural even number, e.g. 2, 4, 6, . . .).
[0036] FIG. 3 depicts a 12-tooth section of a stator having 48 stator teeth. In the embodiment of FIG. 3, machine 22 is a 6 phase, permanent magnet synchronous motor. The six phases in FIG. 3 are represented by letters, where ABCDEF correspond to positive windings for each phase and ABCDEF correspond to negative windings for each phase. The pattern of windings in FIG. 3 is AA EE BB FF CC DD, where letters A-F correspond to six phases. The pattern of windings in the next 12 stator teeth is electrically reversed, i.e., AA EE BB FF CC DD.
[0037] FIG. 4 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 2 galvanic separated 3 phase drives. In the embodiment of FIG. 4, all windings for a single phase are connected in series. A first drive 40, of drive unit 20, generates three phase drive signals, ABC, with each phase separated by 120 degrees. The windings are arranged such that all the windings associated with phase A are in series, all the windings associated with phase B are in series and all the windings associated with phase C are in series. The windings arranged in series alternate polarity. A second drive 42, of drive unit 20, generates three phase drive signals, DEF, with each phase separated by 120 degrees. Phases DEF are offset from phases ABC, respectively, by an angle (e.g., 30 degrees). The windings are arranged such that all the windings associated with phase D are in series, all the windings associated with phase E are in series and all the windings associated with phase F are in series. The windings arranged in series alternate polarity.
[0038] FIG. 5 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 2 galvanic separated 3 phase drives. Drives 40 and 42 are similar to those in FIG. 4. In the embodiment of FIG. 5, windings for a respective phase are connected in two parallel branches, each branch having series connected windings. The windings arranged in series alternate polarity.
[0039] FIG. 6 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 2 galvanic separated 3 phase drives. Drives 40 and 42 are similar to those in FIG. 4. In the embodiment of FIG. 6, windings for a respective phase are connected in four parallel branches, each branch having a single positive-negative winding pair.
[0040] FIG. 7 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 4 galvanic separated 3 phase drives. In the embodiment of FIG. 7, two drives 40 and 40' are used to generate drive signals for phases ABC. Two drives 42 and 42' are used to generate drive signals for phases DEF. Windings of the same phase coupled to a common drive are connected in series. Using two drives 40 and 40' for phases ABC and two drives 42 and 42' for phases DEF provides increased power over the embodiments of FIGs. 4-6, to handle higher loads.
[0041] FIG. 8 depicts an exemplary embodiment of a 48 tooth permanent magnetic synchronous motor supplied from a real 6 phase supply system composed of 4 galvanic separated 3 phase drives. In the embodiment of FIG. 8, two drives 40 and 40' are used to generate drive signals for phases ABC. Two drives 42 and 42' are used to generate drive signals for phases DEF. Windings of the same phase coupled to a common drive are connected in parallel. [0042] The above embodiments of FIGs. 4-8 relate to a 6 phase permanent magnetic synchronous motor coupled to a number of drives. The number of drives in FIGs. 4-8 is 2 or 4, but in other embodiments the number of drives may be an integer multiple of 2.
[0043] Other embodiments employ a 9 phase permanent magnetic synchronous motor. Embodiments of a 9 phase machine 22 include machines having 18*k stator teeth and 17*k rotor poles (where k is natural even number, e.g., 2, 4, 6, . . .). In one exemplary embodiment, the stator includes 72 stator teeth and the rotor includes 68 poles. FIG. 9 depicts an 18-tooth section of a stator having 72 stator teeth. In the embodiment of FIG. 9, machine 22 is a 9 phase, permanent magnet synchronous motor. The 9 phases in FIG. 9 are represented by letters, where ABCDEFGHI correspond to positive windings for each phase and ABCDEFGHI correspond to negative windings for each phase. The pattern of windings in FIG. 9 is AA EE II BB FF GG CC DD HH, where letters A-I correspond to 9 phases. The pattern of windings in the next 18 stator teeth is electrically reversed, i.e., AA EE II BB FF GG CC DD HH.
[0044] FIG. 10 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of 3 galvanic separated 3 phase drives. In the embodiment of FIG. 10, all windings for a phase are connected in series. A first drive 50, of drive unit 20, generates three phase drive signals, ABC, with each phase separated by 120 degrees. The windings are arranged such that all the windings associated with phase A are in series, all the windings associated with phase B are in series and all the windings associated with phase C are in series. The windings arranged in series alternate polarity. A second drive 52, of drive unit 20, generates three phase drive signals, DEF, with each phase separated by 120 degrees. Phases DEF are offset from phases ABC, respectively, by an angle (e.g., 40 degrees). The windings are arranged all the windings associated with phase D are in series, all the windings associated with phase E are in series and all the windings associated with phase F are in series. The windings arranged in series alternate polarity. A third drive 54, of drive unit 20, generates three phase drive signals, GHI, with each phase separated by 120 degrees. Phases GHI are offset from phases ABC, respectively, by an angle (e.g., 80 degrees). The windings are arranged all the windings associated with phase G are in series, all the windings associated with phase H are in series and all the windings associated with phase I are in series. The windings arranged in series alternate polarity. [0045] FIG. 11 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of three galvanic separated three phase drives. Drives 50, 52 and 54 are similar to those in FIG. 10. In the embodiment of FIG. 11, windings for a respective phase are connected in two parallel branches, each branch having series connected windings. The windings arranged in series alternate polarity.
[0046] FIG. 12 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of 3 galvanic separated 3 phase drives. Drives 50, 52 and 54 are similar to those in FIG. 10. In the embodiment of FIG. 12, windings for a respective phase are connected in four parallel branches, each branch having a single positive-negative winding pair.
[0047] FIG. 13 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of 6 galvanic separated 3 phase drives. In the embodiment of FIG. 13, two drives 50 and 50' are used to generate drive signals for phases ABC. Two drives 52 and 52' are used to generate drive signals for phases DEF. Two drives 54 and 54' are used to generate drive signals for phases GHI. Windings of the same phase coupled to a common drive are connected in series. Using two drives 50 and 50' for phases ABC, two drives 52 and 52' for phases DEF and two drives 54 and 54' for phases GHI provides improved power over the embodiments of FIGs. 10-12, to handle higher loads. Already existing drives are used to drive portions of the windings for a phase, eliminating the need to develop and certify drives with higher power.
[0048] FIG. 14 depicts an exemplary embodiment of a 72 tooth permanent magnetic synchronous motor supplied from a real 9 phase supply system composed of 6 galvanic separated 3 phase drives. In the embodiment of FIG. 14, two drives 50 and 50' are used to generate drive signals for phases ABC. Two drives 52 and 52' are used to generate drive signals for phases DEF. Two drives 54 and 54' are used to generate drive signals for phases GHI. Windings of the same phase coupled to a common drive are connected in parallel.
[0049] The above embodiments of FIGs. 10-14 relate to a 9 phase permanent magnetic synchronous motor coupled to a number of drives. The number of drives in FIGs. 10-14 is 3 or 6, but in other embodiments the number of drives may be an integer multiple of 3.
[0050] Embodiments reduce cost for machines with higher load requirements. Using a plurality of drives rather than a single high power drive avoids costs of high power drive development. Using multiple drives provides redundancy. In case of one drive fails, the machine can still operate in a service mode with lower performance. Embodiments provide lower torque ripple which reduces noise and vibration levels. Embodiments provide lower content of magnetomotive force at higher harmonics, with a reduction of core losses and solid losses in the rotor of the machine.
[0051] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. While the description of the present invention has been presented for purposes of illustration and description, it is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications, variations, alterations, substitutions, or equivalent arrangement not hereto described will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the invention. Additionally, while the various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as being limited by the foregoing description, but is only limited by the scope of the appended claims.

Claims

1. A conveyance system comprising:
a car;
a machine for imparting motion to the car, the machine including a stator and a rotor, the stator including 12*k stator teeth, the rotor including l l*k rotor poles, wherein k is a natural even number, the machine including windings located at the stator teeth, the windings arranged in 6 phases; and
a drive unit for providing drive signals to the machine, the drive unit including a plurality of drives, the number of drives being an integer multiple of 2.
2. The conveyance system of claim 1 wherein:
the windings associated with each phase and coupled to a common drive are arranged in electrical series.
3. The conveyance system of claim 1 wherein:
the windings associated with each phase and coupled to a common drive are arranged in electrically parallel branches, each branch include windings arranged in electrical series.
4. The conveyance system of claim 1 wherein:
the windings associated with each phase and coupled to a common drive are arranged in electrical parallel.
5. The conveyance system of claim 1 wherein:
the number of drives equals 2.
6. The conveyance system of claim 1 wherein:
the number of drives equals 4.
7. The conveyance system of claim 1 wherein:
the drives include a first drive and a second drive, the first drive generating drive signals of a first phase, second phase and third phase, the second drive generating drive signals of a fourth phase, fifth phase and sixth phase.
8. The conveyance system of claim 7 wherein:
the first phase and fourth phase are offset by an angle of 30 degrees.
9. The conveyance system of claim 1 wherein:
the car is an elevator car.
10. A conveyance system comprising:
a car; a machine for imparting motion to the car, the machine including a stator and a rotor, the stator including 18*k stator teeth, the rotor including 17*k rotor poles, wherein k is a natural even number, the machine including windings located at the stator teeth, the windings arranged in 9 phases; and
a drive unit for providing drive signals to the machine, the drive unit including a plurality of drives, the number of drives being an integer multiple of 3.
11. The conveyance system of claim 10 wherein:
the windings associated with each phase and coupled to a common drive are arranged in electrical series.
12. The conveyance system of claim 10 wherein:
the windings associated with each phase and coupled to a common drive are arranged in electrically parallel branches, each branch include windings arranged in electrical series.
13. The conveyance system of claim 10 wherein:
the windings associated with each phase and coupled to a common drive are arranged in electrical parallel.
14. The conveyance system of claim 10 wherein:
the number of drives equals 3.
15. The conveyance system of claim 10 wherein:
the number of drives equals 6.
16. The conveyance system of claim 10 wherein:
the drives include a first drive and a second drive, the first drive generating drive signals of a first phase, second phase and third phase, the second drive generating drive signals of a fourth phase, fifth phase and sixth phase.
17. The conveyance system of claim 16 wherein:
the first phase and fourth phase are offset by an angle of 40 degrees.
18. The conveyance system of claim 16 wherein:
the drives include a third drive, the third drive generating drive signals of a seventh phase, eighth phase and ninth phase.
19. The conveyance system of claim 18 wherein:
the first phase and seventh phase are offset by an angle of 80 degrees.
20. The conveyance system of claim 10 wherein:
the car is an elevator car.
PCT/US2014/011264 2014-01-13 2014-01-13 Drive unit for multiphase permanent magnet synchronous motor Ceased WO2015105510A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP14877715.4A EP3095184A4 (en) 2014-01-13 2014-01-13 Drive unit for multiphase permanent magnet synchronous motor
US15/111,028 US9932204B2 (en) 2014-01-13 2014-01-13 Drive unit for multiphase permanent magnet synchronous motor
CN201910603551.XA CN110492825A (en) 2014-01-13 2014-01-13 Delivery system
CN201480073036.0A CN105917572B (en) 2014-01-13 2014-01-13 Drive unit for polyphase permanent magnet synchronous motor
HK16112700.8A HK1224437B (en) 2014-01-13 Drive unit for multiphase permanent magnet synchronous motor
PCT/US2014/011264 WO2015105510A1 (en) 2014-01-13 2014-01-13 Drive unit for multiphase permanent magnet synchronous motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2014/011264 WO2015105510A1 (en) 2014-01-13 2014-01-13 Drive unit for multiphase permanent magnet synchronous motor

Publications (1)

Publication Number Publication Date
WO2015105510A1 true WO2015105510A1 (en) 2015-07-16

Family

ID=53524221

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2014/011264 Ceased WO2015105510A1 (en) 2014-01-13 2014-01-13 Drive unit for multiphase permanent magnet synchronous motor

Country Status (4)

Country Link
US (1) US9932204B2 (en)
EP (1) EP3095184A4 (en)
CN (2) CN110492825A (en)
WO (1) WO2015105510A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017027296A1 (en) * 2015-08-07 2017-02-16 Otis Elevator Company Rescue control and method of operating an elevator system including a permanent magnet (pm) synchronous motor drive system
WO2017027303A1 (en) * 2015-08-07 2017-02-16 Otis Elevator Company Elevator system including a permanent magnet (pm) synchronous motor drive system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2680793B1 (en) * 2017-01-24 2019-06-19 Ramos Angel Gabriel Ramos Configurable coil electric motor
CN113346702B (en) * 2021-06-23 2023-04-07 浙江盘毂动力科技有限公司 Method for weakening target harmonic in axial flux motor

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000201462A (en) * 1998-10-27 2000-07-18 Mitsubishi Electric Corp Thin large-diameter rotary electric machine and elevator using the same
JP2005110414A (en) 2003-09-30 2005-04-21 Okuma Corp Synchronous motor
JP2009050036A (en) * 2005-08-04 2009-03-05 Takahito Arai Motor controller achieving higher accuracy in low revolution zone
US20100201219A1 (en) * 2007-05-22 2010-08-12 Nils-Anton Moellgaard Electromotive Part Of An Elevator Drive
JP2010178442A (en) * 2009-01-28 2010-08-12 Hitachi Ltd Outer rotation type permanent magnet rotary electric machine and elevator apparatus using same
WO2010110483A2 (en) 2009-03-25 2010-09-30 Moog Japan Ltd. Electric motor system
US20120001512A1 (en) * 2008-10-09 2012-01-05 Feaam Gmbh Electric Motor
KR20120041318A (en) 2010-10-21 2012-05-02 현대엘리베이터주식회사 Emergency drive method of nine phase induction motor operating system for high speed elevator

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07298685A (en) * 1994-04-27 1995-11-10 Meidensha Corp Driving system of multiplex winding motor
JPH09331694A (en) * 1996-06-10 1997-12-22 Toshiba Corp Inverter motor
GB2345586A (en) * 1999-01-11 2000-07-12 Elliott Ind Ltd An electric motor, a wheel and drive apparatus for an electric vehicle
JP3896047B2 (en) 2002-07-26 2007-03-22 株式会社豊田中央研究所 Motor drive control device
GB0324785D0 (en) * 2003-10-24 2003-11-26 Electronica Products Ltd Magnetic gearing of permanent magnet brushless motors
JP2005295686A (en) * 2004-03-31 2005-10-20 Matsushita Electric Ind Co Ltd Generator
JP2006089225A (en) * 2004-09-24 2006-04-06 Matsushita Electric Ind Co Ltd Elevator equipment
US7277304B2 (en) 2005-09-23 2007-10-02 Gm Global Technology Operations, Inc. Multiple inverter system with single controller and related operating method
GB0600837D0 (en) * 2006-01-14 2006-02-22 Alstom Stators and electrical machines incorporating such stators
JP4745857B2 (en) * 2006-02-20 2011-08-10 三菱電機株式会社 Electric machine
US8146714B2 (en) * 2006-12-14 2012-04-03 Otis Elevator Company Elevator system including regenerative drive and rescue operation circuit for normal and power failure conditions
US7990098B2 (en) 2007-07-30 2011-08-02 GM Global Technology Operations LLC Series-coupled two-motor drive using double-ended inverter system
WO2010019126A1 (en) * 2008-08-15 2010-02-18 Otis Elevator Company Management of power from multiple sources in an elevator power system
DE102009000681A1 (en) * 2009-02-06 2010-08-12 Robert Bosch Gmbh synchronous machine
DE102010003217A1 (en) * 2010-03-24 2011-09-29 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Electric machine and steering device
FI122756B (en) * 2010-05-25 2012-06-29 Abb Oy Winding in an AC machine
CN202111547U (en) * 2011-06-24 2012-01-11 大连名阳实业有限公司 Fault Tolerant Flux Switching Permanent Magnet Motor
JP2013215028A (en) * 2012-03-31 2013-10-17 Nippon Densan Corp Single-phase induction motor
CN103219851B (en) * 2013-05-14 2015-03-11 山东理工大学 Motor for automobile idle-free system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000201462A (en) * 1998-10-27 2000-07-18 Mitsubishi Electric Corp Thin large-diameter rotary electric machine and elevator using the same
JP2005110414A (en) 2003-09-30 2005-04-21 Okuma Corp Synchronous motor
JP2009050036A (en) * 2005-08-04 2009-03-05 Takahito Arai Motor controller achieving higher accuracy in low revolution zone
US20100201219A1 (en) * 2007-05-22 2010-08-12 Nils-Anton Moellgaard Electromotive Part Of An Elevator Drive
US20120001512A1 (en) * 2008-10-09 2012-01-05 Feaam Gmbh Electric Motor
JP2010178442A (en) * 2009-01-28 2010-08-12 Hitachi Ltd Outer rotation type permanent magnet rotary electric machine and elevator apparatus using same
WO2010110483A2 (en) 2009-03-25 2010-09-30 Moog Japan Ltd. Electric motor system
KR20120041318A (en) 2010-10-21 2012-05-02 현대엘리베이터주식회사 Emergency drive method of nine phase induction motor operating system for high speed elevator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3095184A4

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017027296A1 (en) * 2015-08-07 2017-02-16 Otis Elevator Company Rescue control and method of operating an elevator system including a permanent magnet (pm) synchronous motor drive system
WO2017027303A1 (en) * 2015-08-07 2017-02-16 Otis Elevator Company Elevator system including a permanent magnet (pm) synchronous motor drive system
CN107848734A (en) * 2015-08-07 2018-03-27 奥的斯电梯公司 Rescue control and method for operating an elevator system including a permanent magnet (PM) synchronous motor drive system
AU2016307422B2 (en) * 2015-08-07 2021-05-13 Otis Elevator Company Elevator system including a permanent magnet (PM) synchronous motor drive system
US11014778B2 (en) 2015-08-07 2021-05-25 Otis Elevator Company Rescue control and method of operating an elevator system including a permanent magnet (PM) synchronous motor drive system
CN107848734B (en) * 2015-08-07 2021-06-22 奥的斯电梯公司 Rescue control and method of operating an elevator system including a permanent magnet (PM) synchronous motor drive system
US11078049B2 (en) 2015-08-07 2021-08-03 Otis Elevator Company Elevator system including a permanent magnet (PM) synchronous motor drive system

Also Published As

Publication number Publication date
US20160340151A1 (en) 2016-11-24
CN110492825A (en) 2019-11-22
HK1224437A1 (en) 2017-08-18
CN105917572B (en) 2019-09-10
EP3095184A1 (en) 2016-11-23
CN105917572A (en) 2016-08-31
US9932204B2 (en) 2018-04-03
EP3095184A4 (en) 2017-10-04

Similar Documents

Publication Publication Date Title
CN105634225B (en) Brushless DC motor and electric power steering system using the same
CN110383639B (en) Rotary Motor System
US9932204B2 (en) Drive unit for multiphase permanent magnet synchronous motor
JPWO2015045013A1 (en) Energy conversion system
WO2018030143A1 (en) Drive device and electric motor drive device
Nguyen et al. Different virtual stator winding configurations of open-end winding five-phase PM machines for wide speed range without flux weakening operation
Nanoty et al. Design of multiphase induction motor for electric ship propulsion
Omar et al. Performances comparison of various design slot pole of Field Excitation Flux Switching Machines with segmental rotor
WO2015040529A3 (en) Hybrid operating synchronous electrical machine
Döbler et al. High performance drive for electric vehicles—System comparison between three and six phase permanent magnet synchronous machines
Choi et al. Design of multi-phase permanent magnet motor for ship propulsion
JP2011130525A (en) Electric motor drive system
HK1224437B (en) Drive unit for multiphase permanent magnet synchronous motor
US20130181641A1 (en) Unipolar switching apparatus of switched reluctance motor
JP2018050441A (en) Multiple AC motor drive system
US10576830B2 (en) Electric generator for diesel electric locomotive
Tripathi et al. Influence of three-phase symmetry on pulsating torque in induction motor drives
Vipin et al. Hardware implementation of space vector PWM control of Permanent Magnet Synchronous Motor
Ahmed et al. Reduction of cogging torque and torque ripple in Modulated Pole Machines by geometrical changes
CN110798015A (en) Power generator set
Ali et al. Design and investigation of segmented rotor dual stator HE FSM for aircraft applications
JP2020078198A (en) Multi-winding AC motor drive
CN211791115U (en) Power generator set
JPWO2012093492A1 (en) Rotating machine test equipment
Bu-lai et al. Modeling for a dual three-phase induction motor based on a winding transformation

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14877715

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 15111028

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

REEP Request for entry into the european phase

Ref document number: 2014877715

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2014877715

Country of ref document: EP