Drive circuit for brushless motor

Details Drive circuit for brushless motor Drive circuit for brushless motor

1992-11-05

1995-05-09

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318439, 318138, H02K 2300, H02P 118

Patent

active

054143314

ABSTRACT:
A drive circuit for a brushless motor having a rotor formed of a permanent magnet and stator coils includes a plurality of magnetic sensors each for sensing a rotational position of the rotor of the brushless motor to generate a voltage signal in accordance with a magnitude of a magnetic flux density received from the rotor passing, power amplifiers each for converting the voltage signal from each corresponding magnetic sensor to a drive voltage having a predetermined phase and voltage value and supplying the drive voltage obtained to each corresponding stator coil, a speed control signal generating circuit for generating a speed control signal for control of the rotational speed of the brushless motor, and magnetic sensor controller for controlling the magnitude of the output voltage of each magnetic sensor in response to the speed control signal so that the output voltage of each magnetic sensor takes a value in accordance with the speed control signal.

REFERENCES:
patent: 3839661 (1974-10-01), Wada
patent: 4008425 (1977-02-01), Dickey
patent: 4135120 (1979-01-01), Hoshimi et al.
patent: 4258299 (1981-03-01), Takeda et al.

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