Driving circuit for brushless DC motors

Details Driving circuit for brushless DC motors Driving circuit for brushless DC motors

1985-12-03

1986-12-30

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 602

Patent

active

046331506

ABSTRACT:
A driving circuit for a brushless DC motor having a small amount of torque ripple comprises a magnetic pole position detecting circuit for detecting positions of magnetic poles of a rotor magnet and delivering polyphase signals indicating the positions, a rectifier adder circuit for producing a sum of positive or negative portions of the polyphase signals from the magnetic pole position detecting circuit, a first error amplifier for adjusting a gain of the magnetic pole position detecting circuit to make an output signal of the rectifier adder circuit to be proportional to an instruction signal, a power supply circuit for supplying currents to armature coils in response to the polyphase signals, a modulating signal producing circuit for producing a modulating signal synchronized with the rotation of the motor, and a second error amplifier for adjusting a gain of the power supply circuit to make the currents supplied to the armature coils to be proportional to the modulating signal.

REFERENCES:
patent: 4114073 (1978-09-01), Uzuka
patent: 4442386 (1984-04-01), Uchida et al.

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