Two stage electrical braking for a variable speed AC induction m

Details Two stage electrical braking for a variable speed AC induction m Two stage electrical braking for a variable speed AC induction m

1983-06-15

1985-04-30

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Braking

318760, H02P 324

Patent

active

045146772

ABSTRACT:
A two-stage electrical braking system for a variable speed alternating current induction motor powered from a variable frequency, variable voltage power source utilizes capacitance connected across a primary winding of the motor in a first stage of braking and short-circuits the primary winding in a second braking stage. The system is arranged such that the control of the two braking stages is independent of the motor terminal voltage and braking can be initiated by either a braking command or automatically upon interruption of power to the system. The control system uses a fixed time delay to initiate the second stage of braking a predetermined time interval after the first stage is initiated.

REFERENCES:
patent: 2477155 (1949-08-01), Fuge
patent: 3153182 (1964-10-01), Choudhury
patent: 3581168 (1971-05-01), Kirkby
patent: 4305030 (1981-12-01), Lorenz

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