Dynamic braking of A.C. motors

Details Dynamic braking of A.C. motors Dynamic braking of A.C. motors

1979-04-02

1982-01-19

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Braking

318757, H02P 318, H02P 704

Patent

active

043119484

ABSTRACT:
A three-phase electric motor is partially braked as a result of self-excitation when the power supply is disconnected and a capacitor is connected across one of the windings. The motor is then rapidly brought to a standstill by applying a short-circuit (or connecting a relatively low impedance) across one or both of the other windings, and essential condition being that the short-circuit is initiated within a predetermined range of values of phase angle in a waveform of the self-excitation. Preferred ranges of phase angle are established for selected configurations of mechanical and electronic short-circuiting switches.

REFERENCES:
patent: 2973467 (1961-02-01), Choudhury et al.
patent: 3153182 (1964-10-01), Choudhury
patent: 4181197 (1980-01-01), Tanabe et al.
patent: 4215304 (1980-07-01), D'Atre et al.

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