Current limiting for DC electric motor start-up

Details Current limiting for DC electric motor start-up Current limiting for DC electric motor start-up

1993-11-02

1995-08-15

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318782, 318800, H02P 706

Patent

active

054422728

ABSTRACT:
A method for reducing motor start-up current in an electric motor control system. The method first prevents flow of current through the motor while slowly charging a parallel capacitor. Then, the motor control voltage is reduced and current is switched through the motor. The motor control voltage remains reduced until the motor starts turning. After the motor starts turning, the control voltage is slowly increased as the motor accelerates, limiting the current from the power supply.

REFERENCES:
patent: 3997832 (1976-12-01), Tanaka et al.
patent: 4544868 (1985-10-01), Murty
patent: 4839754 (1989-06-01), Gami et al.
patent: 4879498 (1989-11-01), Shinohara et al.
patent: 5268623 (1993-12-01), Muller
patent: 5327052 (1994-07-01), Sakurai et al.

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