A.C. Motor drive apparatus

Details A.C. Motor drive apparatus A.C. Motor drive apparatus

1983-03-11

1984-07-03

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, 318806, 318811, H05P 540

Patent

active

044581920

ABSTRACT:
An apparatus for driving an A.C. motor includes a circuit for computing the sum of polyphase A.C. signals used to drive a pulse-width modulation circuit for controlling an inverter, and for limiting the amplitude of a current command when said sum is other than zero. When an imbalance occurs in the polyphase A.C. signals, the current command amplitude is immediately limited in accordance with the state of the imbalance to prevent saturation of a current amplifier that is operable to produce the polyphase A.C. signals by amplifying the outputs of an arithmetic circuit. These outputs are difference currents obtained by computing the difference between polyphase command currents and corresponding ones of detected polyphase currents actually applied to the A.C. motor. Preventing saturation of the current amplifier assures that the polyphase currents actually applied to the A.C. motor will be held in a balanced state at all times.

REFERENCES:
patent: 3851234 (1974-11-01), Hoffman et al.
patent: 4320331 (1982-03-01), Plunkett
patent: 4322671 (1982-03-01), Kawada et al.
patent: 4361794 (1982-11-01), Kawada et al.

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