Method and system of braking and asynchronous motor

Details Method and system of braking and asynchronous motor Method and system of braking and asynchronous motor

1985-02-21

1986-09-16

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Braking

318760, H02P 324

Patent

active

046124900

ABSTRACT:
A braking direct current (d.c.) (u.sub.g) is injected by way of a diode into at least one of the motor windings at a make time (T.sub.1) which occurs after the tripping of the motor. The make time lies between, at the earliest, a first reference time (T.sub.r1) and, at the latest, a second reference time (T.sub.r2), the braking d.c. voltage (u.sub.g) being substantially equal to a back-voltage (u.sub.r) of the motor winding at the first reference time. The second reference time leads, by 5% of the full periodicity of the network voltage, the first peak in time of the back voltage to occur after the first reference time. The polarity of the braking d.c. voltage (u.sub.g) at the make time (T.sub.1) is opposite to the polarity towards which the back-voltage (u.sub.r) is tending at the first reference time.
The braking accuracy of d.c. braked asynchronous motors is improved without increased loading of the motor by relatively heavy currents.

REFERENCES:
patent: 3376485 (1968-04-01), Shibata et al.
patent: 3708734 (1973-01-01), Rowe
patent: 3866097 (1975-02-01), Anzai et al.
patent: 4417191 (1983-11-01), Schmidt

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