Deceleration apparatus for motor and drive circuit for use in mo

Details Deceleration apparatus for motor and drive circuit for use in mo Deceleration apparatus for motor and drive circuit for use in mo

1990-04-05

1992-09-29

Ro, Bentsu

Electricity: motive power systems

Braking

Dynamic braking

318254, 318380, H02P 314

Patent

active

051516373

ABSTRACT:
A deceleration apparatus of an AC servo motor for use in an industrial sewing machine performs a regenerating braking operation during a motor deceleration period. At an early time in the regenerating braking operation of the motor, an intermittent regenerating braking operation is carried out by supplying a current in a control circuit of a motor drive circuit. Subsequently, a continuous regenerating braking operation in the motor is carried out. A drive element comprising a switching element or a transistor in the control circuit is protected in accordance with an intermittent regenerating braking operation or a small regenerating braking current.

REFERENCES:
patent: 3947740 (1976-03-01), Tsuboi
patent: 3969661 (1976-07-01), Morinaga et al.
patent: 4401926 (1983-08-01), Morton et al.
patent: 4423363 (1983-12-01), Clark et al.
patent: 4732099 (1988-03-01), Neki et al.
patent: 4787021 (1988-11-01), Hokari et al.
patent: 4791344 (1988-12-01), Yoshida et al.

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