Sensorless brushless motor

Details Sensorless brushless motor Sensorless brushless motor

1988-09-30

1989-10-17

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02P 602

Patent

active

048749931

ABSTRACT:
In a brushless motor of the kind not employing a sensor for detecting rotor position, a rotational reference position of the rotor is detected based on an induction voltage in a stator excitation coil, and an energization switching point of the stator excitation coil is determined to occur a delayed time from the reference position. The time delay is increased or decreased in response to the rotational speed of the motor, so that energization switching of the excitation coils is performed at the optimum position in accordance with corresponding changes in the rotational speed of the motor. Signal masking is performed so that noise generated by the excitation coil switching does not interfere with the detection of the rotor reference position.

REFERENCES:
patent: 4070606 (1978-01-01), Morozumi et al.
patent: 4132930 (1979-01-01), Schalk
patent: 4136308 (1979-01-01), King
patent: 4295085 (1981-10-01), Lafuze
patent: 4449086 (1984-05-01), Hoffman et al.
patent: 4473781 (1984-09-01), Nielsen
patent: 4484123 (1984-11-01), Raducanu
patent: 4603283 (1986-07-01), Oltendorf
patent: 4651068 (1987-03-01), Meshkat-Razavi
patent: 4712050 (1987-12-01), Nagasawa et al.

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