Classifications

• • 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
  • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
  • H02P6/14—Electronic commutators
  • H02P6/16—Circuit arrangements for detecting position
• • 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
  • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
  • H02P6/04—Arrangements for controlling or regulating the speed or torque of more than one motor

Definitions

• the invention relates to a method for controlling the synchronized operation of at least two polyphase electric motors with synchronized operation, each motor being provided with a stator part equipped with electric coils and a rotor with N pairs of poles magnetized radially in direction. alternated.
• the invention also relates to a drive device comprising at least two of these polyphase motors with which are associated means for detecting the position of said rotor and power electronics for supplying the coils of each of their phases.
• the present invention relates to the field of synchronous brushless type motors, with permanent magnets on the rotor and stator windings.
• the document FR-2,754,953 already describes such a polyphase electric motor consisting, on the one hand, of a fixed part or stator equipped with electric coils and, on the other hand, of a part mobile or rotor.
• This presents NI pairs of poles magnetized radially in alternating directions, NI being equal to 4 or 5.
• the stator it comprises N2 identical poles, N2 being equal to 9 so that these poles are spaced 40 ° apart. They are also grouped consecutively in threes so that each phase is made up of a W-shaped circuit grouping three consecutive poles of the stator.
• the central pole of the W carries the winding of said phase.
• the central poles of two W circuits are angularly spaced 120 °.
• these means for detecting the position of the rotor can take different embodiments, in particular that of an optical encoder, a system for detecting the induced voltage, at least one magnetic element, etc.
• power electronics generally consisting of transistors, manages the supply of the coils corresponding to the phases of the motor. More particularly as a function of this position of the rotor, these phases are supplied according to selected sequences.
• this method does not make it possible to have a rigorous positioning and synchronism of all the motors since the position of each rotor is not managed directly by the synchronization circuit. It is therefore, for example, possible for one of the rotors to have several electrical turns (phase power cycles) ahead of the others, since the position of a rotor is only detected on a full turn rotor.
• this system requires a lot of components, in particular, for each motor, a logic electronics managing, starting from the determination of the position of the rotor, the switching of the phases through their power electronics. A synchronization circuit completes, finally, this set.
• document EP-0 246 522 discloses a device for controlling direct current motors with electronic switching, these motors also comprising means for detecting the position of the rotor. In the end, it is a question of ensuring the synchronized operation of two identical motors by supplying them according to a determined sequence, as soon as, by means of the means for detecting the position of the rotors, it is found that these are in the same position.
• the drivers are only authorized to supply the phases of two motors in a sequence determined at the time of starting, only when the signals coming from the encoder of the first motor are equal to the signals of the encoder of the second engine and the same goes for the next power sequence.
• the solution according to the invention is intended to ensure more fluid control of these motors, this by avoiding any risk that the motors, intended to operate in synchronized manner, can get offset from each other, over more than one electric turn.
• the invention relates to a method for controlling the synchronized operation of at least two polyphase electric motors each provided with a stator part equipped with electric coils and a rotor with N pairs of poles magnetized radially in alternating direction, characterized by the fact that s
• a unique synchronization supply sequence for the motors is defined by logic synchronization electronics; • applying said defined supply sequence to the motor phase coils in an identical manner using at least one power electronics.
• the invention also relates to a drive device for implementing the method, comprising at least two polyphase electric motors with synchronized operation, each motor being provided with a stator part equipped with electric coils and an N-pair rotor. of poles magnetized radially in alternating directions, with these motors being associated with means for detecting the position of their rotor and a power electronics for supplying the coils of each of their phases, this device also comprising a logic synchronization electronics connected to the means for detecting the position of the rotor of each of these motors in order, according to the detected position of the rotors, to control, according to the same supply sequence, the phases of each motor.
• Figure 1 is a schematic and schematic representation of a drive device according to the invention comprising two synchronous brushless motors.
• Figure 2 is a representation identical to Figure 1 corresponding to the case where the motors are identical allowing the use of a single power electronics.
• Figure 3 is a schematic representation of an example of a three-phase motor.
• FIG. 4 represents the electrical diagram of connection of the three phases of the motor and also of the three Hall probes constituting the means of detection and position of the rotor.
• FIG. 5 is a vector representation of the three phases of the motor and the representation of the six angular sectors determined by the three position detectors.
• the present invention relates to a drive device 1 incorporating at least two synchronous electric motors 2, 3 brushless, an embodiment of which is illustrated in Figure 2, Figures 3 and 4 contributing to understand how it works.
• such a brushless synchronous electric motor is of the polyphase type and comprises a stator part 4 excited by electric coils 5 corresponding to the different phases 6, knowing that this motor 2, 3 also comprises a rotor 8 with N pairs of rotor poles 9 magnetized radially in alternating directions.
• N is equal to 5.
• the stator part 4 comprises P poles 10. These are grouped consecutively by three so as to define a phase consisting of a circuit in W grouping three consecutive stator poles, the central stator pole 11 carrying the winding 3 of the corresponding phase 6 .
• Such a motor 2, 3 comprises means 12 for detecting the position of the rotor 8, these means being illustrated in the drawings in the form of magnetic sensors, more precisely Hall effect probes 13.
• these detection means 12 take position, between each of the phases 6, in a housing 14 equidistant between two stator poles 10 consecutive not belonging to the same phase 6.
• FIG. 4 represents the electrical connection diagram of the three phases 6 of a motor 2, denoted respectively 6a, 6b, 6c, as well as the three Hall 13 probes, noted, respectively, 13a, 13b, 13c.
• the star mounting of the windings 5 requires three output wires for the supply of the phases 6. There are always two windings 5 supplied at the same time and a winding 5 in which no current flows.
• Hall effect probes 13 as detection means 12, these have a common supply and mass, hence a conventional assembly with five dedicated wires.
• FIG. 5 is a vector representation of the three phases 6a, 6b, 6c of the motor 2, 3 and the representation of the six angular sectors 15 determined by the three position detection elements 13 and noted, respectively, 15a, 15b, 15c, 15d , 15th, 15f anti-trigonometrically.
• the three phases 6a, 6b, 6c are electrically offset by 120 °.
• six stable positions are obtained, inside a pair of poles, here represented by the vectors 16a, 16b, 16c, 16d, 16e, 16f.
• the vector 16a represents the stable position obtained by supplying the motor between the output wires 17a and 17b, the current flowing from 17a to 17b.
• the switching points of the position detectors 13 are located graphically on the same vectors. Consequently and through this type of assembly, the rotation of the motor is obtained by applying two by two to the phase coils, successive supply sequences, well known to those skilled in the art.
• the drive device 1 comprising at least two of this type of motors 2, 3, is provided with at least one power electronics 18 for supplying their coils 5 of the phases 6, knowing that it furthermore comprises a single synchronization logic electronics 19 for their operation.
• this electronic synchronization electronics 19 is provided capable, depending on the position determined by the detection means 12 of the rotors 8 of each motor 2, 3, to control, according to an identical supply sequence, the phases 6 of each of these motors 2, 3.
• the motors 2, 3 do not include logic electronics which are specific to them, controlled by an independent synchronization circuit for controlling the supply sequences of their phases.
• an independent synchronization circuit for controlling the supply sequences of their phases.
• none of the motors 2, 3 provided capable of operating synchronously with the drive device 1 can be offset by more than one electric turn relative to the other motors.
• this maximum electrical offset corresponds to a rotation of 180 ° of the rotor 8.
• the logic synchronization electronics 19 is provided capable of determining, as a function of the identified positioning of their rotor 8, the supply sequence to be applied from identical to phases 6 of these motors 2, 3. More precisely, by this means the coils 5 of these motors 2, 3 are supplied in an identical manner so as to obtain, as the case may be, a maximum torque at the level of the rotor of the lagging motor and, on the contrary, d '' a reduced, or even zero, torque to the rotor corresponding to the motor which is ahead.
• the drive device according to the invention is not only very simple in design with respect to the known devices insofar as it only has one electronic component logic 19, but in addition, it makes it possible to guarantee perfect synchronization of operation of the motors 2, 3 since no offset of more than one electric revolution can occur in this case.
• the drive device according to the invention can find its application, typically in the field of motor vehicle windscreen wiper control.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Cites Families (5)

• 2002
  • 2002-07-30 FR FR0209686A patent/FR2843248B1/fr not_active Expired - Lifetime
• 2003
  • 2003-07-10 US US10/515,721 patent/US20050206333A1/en not_active Abandoned
  • 2003-07-10 EP EP03750799A patent/EP1525657A1/de not_active Withdrawn
  • 2003-07-10 WO PCT/FR2003/002174 patent/WO2004017510A1/fr not_active Ceased

Non-Patent Citations (1)

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