Motor control apparatus and motor controlling method

Details Motor control apparatus and motor controlling method Motor control apparatus and motor controlling method

1990-06-28

1991-09-10

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318808, 318800, H02P 5402

Patent

active

050477048

ABSTRACT:
In a motor control apparatus and a motor controlling method, when a connector is disconnected while an operation signal is ON, an excitation current component signal becomes zero and does not reach a predetermined value even after a predetermined period of time. In this case, a current component signal discriminating circuit discriminates that an amplitude of the excitation current component signal is equal to or less than the predetermined value, a timer issues an alarm signal because the predetermined period has passed from input of the operation signal, and a stop circuit stops operation of an inverter upon reception of the alarm signal, so that the inverter is prevented from breakdown.

REFERENCES:
patent: 4426610 (1984-01-01), Kawada et al.
patent: 4451771 (1984-05-01), Nagase et al.
patent: 4532464 (1985-07-01), Igarashi et al.
patent: 4628475 (1986-12-01), Azusawa et al.
patent: 4808903 (1989-02-01), Matsui et al.
patent: 4939437 (1990-07-01), Farag et al.

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