[특허]Torque regulating induction motor system

Torque regulating induction motor system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02P-005/40
출원번호	US-0568120 (1975-04-14)
발명자 / 주소	Plunkett Allan Barr (Erie PA)
출원인 / 주소	General Electric Company (Erie PA 02)
인용정보	피인용 횟수 : 66 인용 특허 : 0

초록 ▼

A torque regulating alternating current induction motor control system comprising a motor flux sensing coil arrangement mounted on the induction motor stator for sensing the actual flux produced across the rotor-stator air gap of the motor and deriving a motor flux voltage signal proportional to the actual motor flux. An integrating circuit integrates the voltage signal to obtain a feedback sensed actual motor flux signal representative of the actual air gap flux. An actual torque feedback circuit converts the actual air gap flux and stator current signal to an actual value of torque feedback control signal. A first feedback control loop is responsive to the actual torque feedback control signal and a command value of torque signal and controls the frequency of operation of a power converter supplying the induction motor. A second feedback control loop also responsive to the feedback sensed actual value of flux converts the flux signal into a (V/Hz) voltage control signal for maintaining a substantially controlled value of rotor-stator air gap flux level. The first and second feedback control loops are interconnected and coact to maintain operation of the induction motor at a controlled value of torque. The actual torque feedback circuit includes a flux signal processing circuit for deriving from the output motor flux signals respective direct and quadrature axes flux signal components and combines these signals with direct and quadrature axes motor current signal components in multiplier circuits for multiplying the quadrature axis flux signal by the direct axis motor current signal and for multipyling the direct axis flux signal by the quadrature axis motor current signal. A summing circuit sums the two products to derive an output actual value of torque developd by the induction motor in accordance with the expression T=K(ydiqs -yqids). The system is designed primarily for use with a three-phase, variable voltage, variable speed, alternating current induction motor intended for traction motor drives and makes available a new and novel actual torque measuring arrangement for use in such systems.

대표청구항 ▼

An improved torque regulating control system for an alternating current induction motor having a stator and a rotor spaced from one another by an air gap, said stator including a winding adapted to be excited by a controllable source of electric power so as to produce electromagnetic flux across said air gap, wherein the improvement comprises: a. motor flux feedback means including means mounted on the motor stator adjacent to said air gap for sensing the actual flux produced across said air gap when saId stator winding is excited and means coupled to said flux sensing means for deriving output actual flux signals representative in magnitude and phase of the actual air gap flux; b. actual torque feedback circuit means responsive to said actual flux signals and to sensed motor stator line currents for deriving an actual value of torque feedback control signal; c. first feedback control loop means responsive to said actual value of torque feedback control signal for controlling the operation of the power source so as to vary the frequency of stator excitation in a manner that maintains operation of the induction motor at a controlled value of torque; and d. second feedback control loop means responsive to said actual flux signals for controlling the power source so as to control the amplitude of stator excitation in a manner that produces a substantially controlled air gap flux level.

이 특허를 인용한 특허 (66)

Lipo Thomas A. (Madison WI) Moreira Julio C. (Madison WI), Air gap flux measurement using stator third harmonic voltage and uses.
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Cutler John H. (Roanoke VA) Walker Loren H. (Salem VA), Apparatus and method for providing a signal proportional to flux in an AC motor for control of motor drive current.
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Takai,Takatoshi; Ito,Takeshi; Tsuji,Hiroya, Control apparatus for controlling traction motor equipped in vehicle.
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Kurosawa Ryoichi (Tokyo JPX), Control devices of induction motors.
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Hucker David J. (Rockford IL by Alice H. Hucker ; legal representative), Frequency and voltage control for inverter powered AC motor.
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D\Atre John D. (Ballston Lake NY), Gain normalization technique for controlled current induction motor system.
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Edelson Jonathan S., High phase order cycloconverting generator and drive means.
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Dadpey Habib (Atlanta GA) Shero David J. (South Park Township ; Alleghany County PA) Merlino Paul J. (West Newton PA), Induction motor control apparatus and method.
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Bose Bimal K. (Latham NY), Induction motor drive system.
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Wieland, Andrew D.; Sauvageau, Joe S., Interface for an enclosure for housing an electrical or electronic device.
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Wu, Long; Shaw, Robert, Interior permanent magnet machine systems and methods for controlling interior permanent magnet machines.
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Singh, Brij N.; Tremel, Chris J.; Gilman, Alan K., Machine systems including pre-power diagnostics.
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D'Atre ; John D. ; Lipo ; Thomas A. ; Plunkett ; Allan B., Means for stabilizing an a-c electric motor drive system.
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Wu, Long; Shaw, Robert, Method and apparatus for characterizing an interior permanent magnet machine.
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Boettner, Fred H.; Cutler, John H.; Walker, Loren H., Method and apparatus for determining the resistance of an AC motor stator.
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Izosimov Dimitrij B. (Ulica Profsojuznaja YUX) Sabanovic Asif (Sarajevo YUX), Method and apparatus for the control of synchronous motors.
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Nagase Hiroshi (Hitachi JPX) Okuyama Toshiaki (Toukai JPX), Method and apparatus of controlling induction motors.
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Tremel, Chris J; Vilar, Eric, Method and controller for an electric motor with fault detection.
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Wu, Long; Shaw, Robert, Method and system controlling an electrical motor with temperature compensation.
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Wu, Long; Shaw, Robert; Kusumba, Srujan, Method and system for controlling an electric motor with compensation for time delay in position determination.
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Wu, Long; Shaw, Robert, Method and system for controlling an electric motor with variable switching frequency at variable operating speeds.
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Kurosawa Ryoichi (Tokyo JPX), Method and system for controlling induction motors.
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Wu, Long; Shaw, Robert, Method and system for determining a position of a rotor of an electric motor with noise reduction.
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Curtiss William P. (Winthrop MA), Polyphase motor drive system with balanced modulation.
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Hirata Akio (Fuchu JPX), Speed control method for AC motors and an apparatus for the control.
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Dutta, Sumit; Thyagarajan, Lav; Wu, Long; Wanner, Kent D., System and method for an inverter for self-excitation of an induction machine.
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Wu, Long; Shaw, Robert; Tremel, Chris J.; Wanner, Kent D., System for calibrating an electrical control system.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Torque regulating induction motor system 원문보기

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Torque regulating induction motor system 원문보기

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