Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1979-07-05
1983-02-01
Truhe, J. V.
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318681, 318802, 318801, 318808, 318811, 318812, 363 56, 363134, 361 18, H02P 758
Patent
active
043718248
ABSTRACT:
An inverter (34) which provides power to an A. C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A. C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by the technique of waveform notching in which the shapes of the notches are varied to determine the average energy content of the overall waveform. Through this arrangement, the operational efficiency of the A. C. machine is optimized. The control circuit includes a microcomputer and memory element which receive various parametric inputs and calculate optimized machine control data signals therefrom. The control data is asynchronously loaded into the inverter through an intermediate buffer (38). A base drive and overlap protection circuit is included to insure that both transistors of a complimentary pair are not conducting at the same time. In its preferred embodiment, the present invention is incorporated within an electric vehicle (10) employing a 144 VDC battery pack (32) and a three-phase induction motor (18).
REFERENCES:
patent: 3609507 (1971-09-01), Beck
patent: 3629725 (1971-12-01), Chun
patent: 4126819 (1978-11-01), Stobbe et al.
patent: 4155113 (1979-05-01), Simmons
patent: 4213103 (1980-07-01), Birt
IBM Technical Disclosure Bulletin, Antistorage Overlap Circuit, B. E. Hart, vol. 16, No. 6, Nov. 1973.
Eaton Corporation
Indyk Eugene S.
Lewis J. G.
McCloskey R. J.
Truhe J. V.
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