WO1989012350A1 - Systeme de moteur a induction polyphase et procede de fonctionnement - Google Patents

Systeme de moteur a induction polyphase et procede de fonctionnement Download PDF

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Publication number
WO1989012350A1
WO1989012350A1 PCT/US1988/001863 US8801863W WO8912350A1 WO 1989012350 A1 WO1989012350 A1 WO 1989012350A1 US 8801863 W US8801863 W US 8801863W WO 8912350 A1 WO8912350 A1 WO 8912350A1
Authority
WO
WIPO (PCT)
Prior art keywords
induction motor
stator winding
rotor
motor system
conductors
Prior art date
Application number
PCT/US1988/001863
Other languages
English (en)
Inventor
Max Ben-Aaron
Original Assignee
Ben Aaron Max
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 claimed from US06/833,982 external-priority patent/US4749933A/en
Application filed by Ben Aaron Max filed Critical Ben Aaron Max
Priority to PCT/US1988/001863 priority Critical patent/WO1989012350A1/fr
Publication of WO1989012350A1 publication Critical patent/WO1989012350A1/fr

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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
    • 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
    • H02P25/18—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 with arrangements for switching the windings, e.g. with mechanical switches or relays
    • H02P25/20—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 with arrangements for switching the windings, e.g. with mechanical switches or relays for pole-changing
    • 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
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/12—Asynchronous induction motors for multi-phase current
    • H02K17/14—Asynchronous induction motors for multi-phase current having windings arranged for permitting pole-changing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • 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
    • 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
    • H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
    • 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
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • 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
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/01—Asynchronous machines

Definitions

  • This invention relates to electric motors and, more particularly, to a polyphase induction motor system with an integral electronic controller which dynamically varies the operating characteristics of the motor to provide desired startup, acceleration, operating speed and efficiency.
  • Three phase motors are widely used for industrial service because three phase power can be generated and distributed more economically in large quantities than single phase power.
  • induction motor includes a stator containing a stator winding and a rotor containing a rotor winding.
  • the operation of three phase induction motors depends on a rotating magnetic field in the air gap between the stator, or stationary part, and the rotor, or rotating part, of the motor.
  • the rotating magnetic field causes rotation of the rotor at nearly the frequency of the power source.
  • the rotor of a so-called squirrel cage motor has a laminated iron core with slots on its periphery.
  • Uninsulated conductors are imbedded in the slots of the cylindrical rotor core and are connected to each other at each end of the rotor.
  • the squirrel cage motor is the most widely used motor of any type because of its rugged simplicity and low cost. It is used to drive such loads as fans, blowers, machines, centrifugal pumps and motor-generator sets.
  • a polyphase induction motor is simple in the sense that the rotor is the only moving part and electrical connections to the rotor are not required. In addition, polyphase induction motors operate with high efficiency at, or near, full load.
  • polyphase induction motors are not used in home appliances.
  • polyphase induction motors have two major disadvantages. When lightly loaded, they have much
  • the motor speed is determined by the power source frequency and the number of poles in the stator winding, thereby making variable speed operation difficult.
  • Variable speed operation of induction motors has been achieved by a number of techniques. Multiple windings provide a number of pole configurations and a number of discrete operating speeds. The voltage of the stator supply can be varied to provide some speed variation.
  • an induction motor system comprising a housing, a stator supported by the housing and including a plurality of stator winding elements positioned about an axis of rotation, a rotor mounted in the housing for rotation about the axis of rotation, means for supplying electrical energy to the motor
  • the dynamic control means can vary the operating speed of the motor by varying the number of magnetic poles and by varying the fundamental frequency component of the individual currents in the elements of the stator winding.
  • the control means can vary the number of phases in the fundamental frequency component of the stator winding currents and can vary the power supplied to the motor and the torque by energizing more or fewer stator winding elements.
  • the dynamic control means can include switching means for individually supplying current through each element of said stator winding in one direction or the opposite direction, memory means for storing a predetermined switching sequence for each element of said stator winding to give a desired operating characteristic, and processor means for sequencing through the switching sequence stored in said memory means and energizing said switching means in accordance with said stored sequence.
  • the system can include means for sensing the motor operation and providing inputs to the processor means for adjusting the operation to provide instantaneously or programmably alterable characteristics.
  • the system can further include means for externally or internally presetting or overriding the operation of the motor system to have predetermined operating characteristics.
  • FIG. 1 is a simplified block diagram of an induction motor system in accordance with the present invention
  • FIGS. 2A-2D are simplified axial and cross-sectional views of an induction motor in accordance with the present invention.
  • FIG. 3 is a diagram of the switching circuit shown in FIG. 1;
  • FIG. 4 is a software flow diagram for one mode of operation of the present invention
  • FIG. 5 is a graph plotting motor speed as a function of supply frequency for different pole configurations indicating a strategy for smoothly accelerating the motor
  • FIG. 6 is a software flow diagram for another mode of operation of the present invention.
  • an induction motor system having an electronic controller for individually controlling the conductors which comprise the stator winding.
  • the motor system includes a polyphase induction motor which is similar to conventional polyphase induction motors in respect to the motor housing except that space is provided for the electronic controller.
  • the stator can be the same as conventional motors, except for windings modified as described below.
  • a squirrel cage rotor is identical to those used in prior art induction motors.
  • the present invention can also utilize a conventional wound rotor or, for synchronous operation, a rotor
  • the motor of the present invention differs from prior art polyphase induction motors in that a novel stator winding configuration is effectively utilized in conjunction with a novel electronic controller for supplying energizing current to stator windings.
  • FIG. 1 A block diagram of an induction motor system in accordance with the present invention is shown in FIG. 1.
  • the induction motor includes a laminated stator 10 supported by a housing 11 and a rotor 12 supported by bearings in the housing end bells 11a for rotation within a generally cylindrical opening 14 in the stator 10.
  • the stator 10 is comprised of a plurality of conductors 20, as best seen in FIG. 2A, positioned in axial slots in the laminations of the stator 10. Each slot in the stator 10 can include two or more conductors 20 as shown in FIG. 2C.
  • the conductors 20 can be imbedded in closed stator slots as illustrated in FIG. 2D.
  • the rotor 12 includes a plurality of axial rotor windings 16 connected together at their ends.
  • the motor is constructed in accordance with prior art techniques except for the unique electrical connections to the stator conductors 20 as described hereinafter.
  • the motor may have a two-pole or four-pole configuration.
  • the conductors 20 are individually connected at one end to a stator winding switching circuit 24, and at the opposite end are connected together in common to the center-tapped ground terminal of a power supply 26.
  • the switching circuit 24 receives power on leads 28 and 30 from the power supply 26 and supplies power to the conductors 20 in a dynamically programmable fashion as described hereinafter.
  • the switching circuit 24 is controlled by a programmable controller 32 which, in a preferred embodiment, is a microcomputer and associated memory unit and interface circuitry.
  • the programmable controller 32 provides the necessary control signals to energize selected conductors 20 in the stator 10 with currents in one direction or the opposite direction. The currents through each of the conductors 20 are changed dynamically as a function of time in accordance with the controller 32
  • the stator produces a rotating magnetic field in a gap 34 between the stator 10 and the rotor 12 which causes the rotor to rotate at a predetermined speed and drive a load 36.
  • the rotation of the rotor 12 can be sensed by an optional speed sensor 38, the output of which is connected to the programmable controller 32.
  • optional inputs can be supplied to the programmable controller 32 from an external source, such as manual switches or an external control system, for determining the speed, acceleration and other operating characteristics of the motor.
  • the controller 32 comprises a microprocessor, such as a type 6502, RAM for temporary storage, ROM for storage of operating routines and tables, and interface circuitry.
  • the power supply 26 can be a center-tapped supply of simple design which converts single phase a.c. to positive and negative d.c. Very little regulation is required.
  • each conductor 20 in the stator windings is connected in common to a reference potential such as the center tap of the d.c. power supply.
  • the opposite end of each conductor 20 is connected to a
  • switch 40 having three possible states. In one state the conductor is connected to a positive voltage +V so as to cause positive current pulses to flow through the conductor 20. In a second position, the conductor is connected to a negative voltage -V so as to cause negative current pulses to flow through the conductor 20. In a third position, the conductor 20 is open-circuited and no current pulses flow. As a result, each individual conductor 20 of the stator winding can be programmed for positive or negative current pulses or no current pulses, resulting in an overall dynamic programming of motor operation. The programming of stator conductor currents simulates particular operating modes of the motor.
  • the conductors 20 are energized to form coils which create magnetic fields which rotate in the air gap 34 and cause rotation of the rotor 12. It will be understood that by appropriate programming of the currents energizing the conductors 20, various modes of operation can be obtained.
  • the fundamental frequency component determines the speed of rotation of the motor.
  • the number of magnetic poles in the motor can be varied by changing the relative phasing of the fundamental frequency components applied to each of the conductors 20. By changing the effective number of poles in the stator, the frequency of rotation is changed in discrete steps.
  • the combination of pole configurations and variable fundamental frequency allows for wide variation of motor speed, under programmed control.
  • each stator slot contains two or more conductors. These conductors can be energized separately using the arrangement shown in FIG. 2B with different currents to produce additional control over the operation of the motor.
  • fundamental frequency variation and pole number changes can be used to slow down and reverse the direction of motor rotation and to provide dynamic braking.
  • FIG. 3 A detailed example of one version of an operational switching circuit 24 is shown partially in FIG. 3.
  • the conductors 20 are connected at one end in common to the center tap terminal of the power supply 26.
  • each slot in the stator has one upper conductor and a lower conductor although more conductors may be supplied if the economics of the solid state switching circuitry so warrant.
  • the circuitry shown is representative of the circuitry for each slot and is repeated for each conductor in each slot in the stator.
  • Electronic switches 44 connect a particular conductor 20 to the positive voltage +V, while the electronic switches 46 connect a particular conductor 20 to the negative voltage -V.
  • switches 44, 46 can be on or both switches 44, 46 can be off.
  • the integral controller will insure that both switches connected to a conductor 20 cannot be on simultaneously.
  • the switches 44, 46 can be any convenient switching device such as MOSFET transistors, bipolar transistors or reed relays.
  • a solid state device provides
  • the switching circuit 24 further includes a plurality of shift registers 48, one for each of the switches 44, 46.
  • the serial outputs of the shift registers 48 are connected to the switches 44, 48 and control the switch states.
  • Each of the shift registers 48 has a clock input for transferring data out through the serial output.
  • the shift registers 48 receive inputs in parallel format from latches 50 which store data received from the controller 32 on a data bus.
  • the other will contain only “0"'s.
  • a "1" strobed out from said shift register 48a or 48b turns the corresponding switch 46a or 44b on or leaves it on if it is already on; a "0" turns it off.
  • the latches 50 and the shift registers 48 each contain eight bits, or one byte although wider data paths can be utilized. Data is strobed into each of the latches 50 from the data bus when an addressing signal is received from
  • circuitry shown in FIG. 3 is but one example of suitable logic for energizing the conductors 20 in a dynamically programmable manner.
  • the logic can be implemented with commercially available devices. In future systems, the logic can be implemented with custom LSI devices to reduce size, cost and power requirements.
  • the conductors 20 can be energized by pulse width modulated digital signals which simulate sine waves in terms of the magnetic fields produced.
  • the simulated sine waves supplied to the various conductors 20 must be shifted in phase to produce three. phase excitation.
  • one half cycle of the sine wave is broken down into 64 intervals, each represented by an eight bit byte.
  • a complete cycle of the sine wave is generated by 1,024 bits. Since the positive and negative half cycles of the sine wave are the same except for polarity, 512 bits and polarity can be used to represent a full cycle.
  • the bit pattern, given in groups of eight bits, is shown in Appendix A.
  • the controller 32 insures that only one of each pair of shift registers associated with a particular conductor 20 contains "1"'s during an interval, while the other shift register is held reset. This insures that only one of the voltages +V, -V is connected to a conductor 20 at a particular time.
  • the corresponding switch is turned on or off in accordance with the data in the shift register.
  • the shift register is clocked with 1,028 pulses to complete a cycle of the fundamental sine wave.
  • the switching circuit 24 is the means whereby the stator winding is programmed to a given configuration.
  • each conductor 20 is paired with one which represents the other side of a coil for producing magnetic fields in the gap 34. Since one end of each conductor 20 is grounded, the two conductors comprising a coil are energized with pulses that are the same, but of opposite polarity so that equal and opposite currents flow and a coil, which corresponds to an actual single turn coil in a conventional. motor, is formed.
  • a coil which corresponds to an actual single turn coil in a conventional. motor
  • each of the switches 44, 46 for energizing the conductors 20 the configuration of the stator winding is programmable.
  • phase A is started at byte 0 in Appendix A
  • phase B is started at bit 172 (in byte 168) with positive polarity
  • phase C is started at bit 172 with negative polarity.
  • Another important parameter in the operation of the present invention is the cross-over point of the fundamental component of the sine wave; that is, the point during the data stream at which the polarity of the voltage connected to conductor 20 must be switched from positive to negative, or vice versa.
  • the cross-over points are 0 for phase A, byte 256 for phase B and byte 256 for phase C.
  • each slot of the stator 10 is provided with an upper conductor and a lower conductor.
  • pulse width modulated power from the supply 26 is switched to each of the upper and lower conductors in slots 1-24 by the switching circuit 24 and the controller 32 as described above, the motor operates in the same manner as if three phase, sinusoidal power were supplied to the stator windings with the phases connected as shown in Table 1.
  • the pulse width modulated signals supplied to the upper and lower conductors in slots 1-24 must be appropriately phased to produce the same rotating magnetic fields as produced by three phase power.
  • the necessary pulse width modulated signals are generated by the controller 32 and the switching circuit 24 by means of the software subroutine illustrated in FIG. 4, which uses the bit stream shown in Appendix A and the information shown in Table 1.
  • the subroutine requires the number of slots (24, in this case), the starting point for each phase in Appendix A (bit 0 for phase A, bit 172 positive for phase B and bit 172 negative for phase C), and the cross-over point where each phase changes polarity (bit 0 for phase A, bit 256 for phase B and bit 256 for phase C).
  • the subroutine variables are (1) a table of current polarities (twice the number of slots); (2) a table
  • the routine shown in FIG. 4 takes bytes from a table in ROM memory corresponding to Appendix A, loads them into the appropriate latch 50 in the switching circuit 24 while keeping track of slot numbers, cross-over points and current status.
  • This subroutine can be cycled continuously to produce a 4-pole configuration. If the clock rate is held constant, the speed will be constant; if the clock rate is increased or decreased, the speed will be increased or decreased in proportion.
  • this subroutine can be incorporated into another routine which varies the sine wave fundamental frequency component and number of poles in the stator configuration. Such a routine is described hereinafter.
  • the motor is started and accelerated smoothly to a predetermined speed; for example, 3600 rpm.
  • the starting and acceleration to the predetermined speed will be accomplished by configuring the motor in a first pole configuration, accelerating up to a first speed, switching the motor to a second pole configuration, accelerating to a second speed, and then switching to a third pole configuration and accelerating to the final operating speed. It is
  • N the speed of operation of a polyphase induction motor
  • p the number of poles produced by the stator winding
  • the present example is illustrated in FIG. 5.
  • the frequency is increased from 20 Hz to 50 Hz.
  • the configuration is then switched to four-pole and the frequency is increased from 30 Hz to 50 Hz.
  • the configuration is switched to two-pole and the frequency is increased from 20 Hz to 60 Hz.
  • the motor is smoothly and rapidly accelerated up to the synchronous speed of 3600 rpm, operating at 60 Hz.
  • the necessary switching for the frequency and pole variation shown in FIG. 5 is performed by the controller 32 and the switching circuit 34 in accordance with a routine in FIG. 6.
  • the routine requires models of a two-pole configuration, a four-pole configuration and a six-pole configuration stored in memory. These models will provide the necessary phase and polarity information for each conductor 20 in the stator similar to the information contained in Table 1.
  • the routine uses pulse width modulation techniques as described above
  • the operation of the motor is entirely programmable in terms of speed and pole configuration.
  • various ones of the conductors 20 can be energized while others are not energized, thereby limiting the power delivered to the motor in light load conditions.
  • the motor can be programmed to decrease speed and to reverse direction, if so desired, or can be programmed to increase or decrease speed while running in accordance with any desired program.
  • the programmed starting described above can be used to reduce the starting transients which occur when full power is abruptly applied to the motor. Furthermore, regenerative braking can be accomplished by making the rotor speed overrun the rotating speed of the stator magnetic field. For battery operation, further switching is required to feed the regenerated power back to the batteries via solid state rectifiers.
  • the program for operation of the motor can be contained entirely within the controller 32; for example, in a ROM memory.
  • preset inputs as shown in FIG. 1 can be utilized to set different modes of operation, depending on the desired operating conditions.
  • a pole configuration or operating speed can be set from selector switches.
  • the motor system of the present invention can be part of a larger system and can be automatically and dynamically controlled from a remote computer or controller which supplies inputs on the preset lines.
  • speed sensors 38 or other sensors of motor operation, can be utilized to control the operation of the controller 32 and the motor in a feedback arrangement.
  • the sensor 38 can be used to determine when a desired operating speed is reached. From then on, the motor is maintained at a constant operating speed.
  • the programmable feature of the present invention can be utilized to shift the phases of the fundamental components supplied to the stator conductors 20 so as to eliminate harmonics and phase differences which otherwise would occur in a conventional motor.
  • the bit patterns shown in Appendix A can be tailored to reduce
  • An induction motor system in accordance with the present invention is particularly useful in applications where a high level of control is needed and use can be made of the programmable feature.
  • the induction motor system is also particularly useful in applications where the inherent flexibility can eliminate or greatly simplify mechanical linkages.
  • the present invention provides the advantages inherent in three phase motors while operating from a single phase a.c. or a d.c. supply.
  • a motor in accordance with the present invention can be used in a washing machine, for example, and would start emulating a 16 pole motor with a 10 Hz supply (75 rpm). After about a revolution, it would be dynamically braked and reversed, thereby providing the washing cycle.
  • the washing cycle can be provided without gears, clutches or other mechanical linkages.
  • the motor can gradually speed up, changing the number of poles and the supply frequency at predetermined points, as described above, to provide a smooth flow of power until the motor operates as a two-pole machine with a frequency high enough to spin the clothes dry to a greater degree than now possible.
  • the induction motor system of the present invention is in electric automobiles. Since the induction motor system of the present invention is compatible with low voltage, high current power sources, the battery pack in an electric car can be used. An electric car can be provided with an induction motor system in accordance with the present invention at each wheel with a central controller for controlling speed and torque so that mechanical clutches, differentials and gear boxes are not needed. The only moving part is the rotor of each motor. The efficiency of the polyphase induction motors under full load is typically over 90%. Great starting torque and a smooth increase in speed are achieved as described above and further economy can be achieved by dynamic braking techniques.
  • the induction motor system of the present invention can be closely matched to the load so as to provide high efficiency.
  • the present invention can be applied to linear induction motors since these operate on the same principles as rotating induction motors. If a rotor with a similar winding and controller replaces the squirrel cage rotor, a "variable speed" synchronous machine is obtained. Such a machine can
  • a polyphase induction motor system in which an internal pulse width modulated polyphase supply and the individual connections of the stator conductors are controlled by an integral, real-time microcomputer system so that the winding topology, the number of poles, the supply voltage and frequency, and the number of phases can be continuously and independently manipulated to provide desirable motor characteristics. These characteristics include high efficiency at all loads, variable speeds, smooth speed variation, smooth starting and acceleration, dynamic braking, reversing, stepping, jogging, constant torque, constant speed and constant power output.
  • the integral computer system provides a clean, simple and effective interface to external control devices. Such a system, drawing power from a single phase external power supply, can replace awkward and inefficient single phase motors while preserving the advantages of a polyphase motor system.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

Un système de moteur à induction, comportant un logement (10), un stator supporté par ce logement et comprenant une pluralité de conducteurs d'enroulement statorique (20) positionnés autour d'un axe de rotation, ainsi qu'un rotor (12) monté dans le logement de rotation autour de l'axe de rotation, est pourvu d'une unité de commande électronique intégrée (32) destinée à moduler de manière dynamique et programmable les courants fournis aux différents conducteurs de l'enroulement statorique. Les conducteurs de l'enroulement statorique sont reliés en commun à une extrémité et sont reliés individuellement à un circuit de commutation (24) à l'autre extrémité. Le circuit de commutation délivre des impulsions de courant positif ou négatif par l'intermédiaire de conducteurs sélectionnés. Des signaux à modulation d'impulsions en durée, générés par l'unité de commande, simulent des signaux d'excitation sinusoïdaux pour permettre diverses configurations de fonctionnement. La variation programmée de la fréquence, de la configuration polaire, de la mise en phase et du niveau de puissance permet de moduler en dynamique la vitesse de rotation, l'accélération, le couple, l'inversion, le freinage et le rendement dynamiques.
PCT/US1988/001863 1986-02-26 1988-06-02 Systeme de moteur a induction polyphase et procede de fonctionnement WO1989012350A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1988/001863 WO1989012350A1 (fr) 1986-02-26 1988-06-02 Systeme de moteur a induction polyphase et procede de fonctionnement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/833,982 US4749933A (en) 1986-02-26 1986-02-26 Polyphase induction motor system and operating method
PCT/US1988/001863 WO1989012350A1 (fr) 1986-02-26 1988-06-02 Systeme de moteur a induction polyphase et procede de fonctionnement

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WO1989012350A1 true WO1989012350A1 (fr) 1989-12-14

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US183548A (en) * 1876-10-24 Improvement in saddles for top rolls of spinning-machines
US2695369A (en) * 1952-05-24 1954-11-23 Robbins & Myers Submersible electric motor
US3175143A (en) * 1961-04-20 1965-03-23 Nat Res Dev Three phase, pole-changing rotary electric machine
US3252027A (en) * 1962-07-09 1966-05-17 Kaltenbach & Voigt Laminar windings for dynamoelectric machines
US3603866A (en) * 1970-03-24 1971-09-07 Kenneth E Opal Energizing system with digital control circuit for regulating multiphase inverter
US3753062A (en) * 1971-05-19 1973-08-14 Lear Motors Corp Polyphase motor system with dc motor characteristics
US4091294A (en) * 1972-09-01 1978-05-23 Kearney & Trecker Corporation A.C. motor control apparatus and method
US4117364A (en) * 1976-05-14 1978-09-26 Massachusetts Institute Of Technology Voltage waveform synthesizer and a system that includes the same
US4290108A (en) * 1978-07-06 1981-09-15 Siemens Aktiengesellschaft Control unit for a converter

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US183548A (en) * 1876-10-24 Improvement in saddles for top rolls of spinning-machines
US2695369A (en) * 1952-05-24 1954-11-23 Robbins & Myers Submersible electric motor
US3175143A (en) * 1961-04-20 1965-03-23 Nat Res Dev Three phase, pole-changing rotary electric machine
US3252027A (en) * 1962-07-09 1966-05-17 Kaltenbach & Voigt Laminar windings for dynamoelectric machines
US3603866A (en) * 1970-03-24 1971-09-07 Kenneth E Opal Energizing system with digital control circuit for regulating multiphase inverter
US3753062A (en) * 1971-05-19 1973-08-14 Lear Motors Corp Polyphase motor system with dc motor characteristics
US4091294A (en) * 1972-09-01 1978-05-23 Kearney & Trecker Corporation A.C. motor control apparatus and method
US4117364A (en) * 1976-05-14 1978-09-26 Massachusetts Institute Of Technology Voltage waveform synthesizer and a system that includes the same
US4290108A (en) * 1978-07-06 1981-09-15 Siemens Aktiengesellschaft Control unit for a converter

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