Control for AC motor drive

Details Control for AC motor drive Control for AC motor drive

1985-02-26

1987-09-15

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, H02P 540

Patent

active

046942360

ABSTRACT:
Battery powered variable speed motor drives typically control the speed of the motor in accordance with a speed command. If the battery discharges to a point where the speed command is greater than that speed which can be supported by the battery voltage, the current drawn from the battery by the motor increases, thereby accelerating discharge of same. This problem is obviated by a control for an AC motor drive according to the present invention which includes means for deriving a signal from the output of the battery representing the maximum motor speed which the battery voltage can support, means for summing the maximum motor speed signal with the speed command signal to derive an error signal and means for summing the error signal with the speed command signal when the commanded speed is greater than that speed which can be supported by the battery voltage to reduce the speed command to the inverter and thereby maintain a predetermined voltage to frequency relationship in the inverter output.

REFERENCES:
patent: 3593103 (1971-07-01), Chandler
patent: 3718851 (1973-02-01), Graf et al.
patent: 3781614 (1973-12-01), Mokrytzki et al.
patent: 3806198 (1974-03-01), Graf et al.
patent: 3859579 (1975-01-01), Plunkett
patent: 3875483 (1975-04-01), Farr
patent: 4047083 (1977-09-01), Plunkett
patent: 4300086 (1981-11-01), Cesarz et al.
patent: 4316132 (1982-02-01), Geppert
patent: 4532464 (1985-07-01), Igarashi et al.
Bose, B. K., "A Microprocessor Based Control System for a Near-Term Electric Vehicle" IEEE Trans. on Ind. App., vol. IA-17, No. 6, 11/12-1981.

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