Method and apparatus for determining the speed of rotation of an

Details Method and apparatus for determining the speed of rotation of an Method and apparatus for determining the speed of rotation of an

1997-07-25

1999-03-16

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318459, 318779, 378131, G01P 346, H01J 3510

Patent

active

058834877

ABSTRACT:
A speed control apparatus for determining and controlling the speed of rotation of a rotor in an AC motor. The motor includes a stator having main and auxiliary windings. Main and auxiliary winding controllers control the operational input signals supplied to the main and auxiliary windings by a signal generator. A pulse generator is connected to the main winding for providing a test pulse during a speed measurement operation. The test pulse magnetizes a portion of the rotor which induces a feedback EMF signal in the auxiliary winding. A feedback sensor circuit receives the feedback signal and forwards it to a microprocessor. The microprocessor calculates the rotational speed of the rotor based on the feedback signal.

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