Sensorless speed detection circuit and method for induction moto

Details Sensorless speed detection circuit and method for induction moto Sensorless speed detection circuit and method for induction moto

1995-03-09

1997-08-05

Wysocki, Jonathan

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

318254, 324177, H02P 700

Patent

active

056546203

ABSTRACT:
The present invention provides a sensorless circuit for detecting rotational speed of a rotor in an induction motor. The circuit includes a switch between the AC source driving the motor and a motor phase winding. When the switch is closed, there is developed across the phase winding a voltage waveform from the AC source. When the switch is subsequently opened, there is developed across the winding a residual voltage waveform induced by the rotor. The speed of the motor is determined by measuring a time interval between selected points on the voltage waveform.

REFERENCES:
patent: 4292573 (1981-09-01), Ebert et al.
patent: 4689542 (1987-08-01), Ibori et al.
patent: 4839589 (1989-06-01), Heinle
patent: 5247235 (1993-09-01), Tu et al.
patent: 5264772 (1993-11-01), Bahn

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