04633150 is referenced by 34 patents and cites 6 patents.

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.

Title
Driving circuit for brushless DC motors
Application Number
6/804259
Publication Number
4633150
Application Date
December 3, 1985
Publication Date
December 30, 1986
Inventor
Yoshiaki Igarashi
Ikoma
JP
Hiroshi Minakuchi
Shiga
JP
Toshio Inaji
Mino
JP
Agent
Wenderoth Lind & Ponack
Assignee
Matsushita Electric Industrial
JP
IPC
H02P 6/02
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