AC motor controller with voltage margin adjustment

Details AC motor controller with voltage margin adjustment AC motor controller with voltage margin adjustment

1993-12-23

1995-12-26

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 318432, 318434, 318801, H02P 528

Patent

active

054790816

ABSTRACT:
A motor controller for control of an AC motor which monitors the DC power provided to an inverter for synthesizing AC waveforms having the needed frequency and phase to power the motor. Information about variations in the DC power to the inverter are incorporated into the control strategy by adjusting a motor base frequency at which the motor moves from a constant torque to a constant horsepower mode of control. The change of control mode allows decrease in the field current, and hence a decrease in the required quadrature voltage while preserving the torque current. The torque current is ultimately limited by a user programmable direct voltage limit.

REFERENCES:
patent: 3781616 (1973-12-01), Mokrytzki et al.
patent: 3838322 (1974-09-01), Greenwell
patent: 3991352 (1976-11-01), Fry et al.
patent: 4461988 (1984-07-01), Plunkett
patent: 4649331 (1987-03-01), Jahns
patent: 5029263 (1991-07-01), Rozman
patent: 5032771 (1991-07-01), Kerkman et al.
patent: 5121043 (1992-06-01), Kerkman et al.

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