Electric motor speed control apparatus and method

Details Electric motor speed control apparatus and method Electric motor speed control apparatus and method

1989-07-14

1991-02-26

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318802, 318757, H02P 540

Patent

active

049964704

ABSTRACT:
The speed of an induction motor is reduced by initially using dynamic electrical braking to slow the motor to a speed at which it will not remain synchronized to the A.C. supply frequency. At this point, A.C. cycle skipping is employed to apply current to the motor at an effective frequency which is a fundamental frequency component of the A.C. supply line frequency. The motor becomes synchronized at this fundamental frequency component. If desired, the motor can be brought to a complete stop by discontinuing the cycle skipping and using the dynamic braking again for a given period of time. This technique provides a very controlled stopping of the motor enabling equipment driven by the motor to be accurately positioned.

REFERENCES:
patent: 3665273 (1972-05-01), Enslin
patent: 3908158 (1975-09-01), Studtmann
patent: 4070605 (1978-01-01), Hoeppner
patent: 4176306 (1979-11-01), Asano et al.
patent: 4461985 (1984-07-01), Stitt
patent: 4481456 (1984-11-01), Meyerand, Jr. et al.
patent: 4491197 (1985-01-01), Nishiwaki
patent: 4524316 (1985-06-01), Brown et al.
patent: 4833386 (1989-05-01), Unsworth
patent: 4862052 (1989-08-01), Unsworth et al.
"Low Cost Electronic Speed Controller for Small Induction Motors," conference in London, England, Sep. 25-27, 1979.

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