Patent Number: 6,512,343

Title: Motor driver

Abstract: A motor driver includes a driving waveform generator simply constructed. Because the generator produces a waveform having rather small numbers of steps divided and voltage levels divided. Respective phase-driving signals responsive to a step-like voltage waveform produced by the generator are applied to a power feeder, so that an alternate current--shaping in a sine wave and changing sequentially--runs through respective phase-coils. Further, phase-advancing control realizes phase agreement between respective phase-currents and back electromotive force generated each of the respective phases. As a result, a motor can be driven efficiently with less torque ripples, vibrations and noises.

Inventors: Yasohara; Masahiro (Hyogo, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: H02P 6/08 (20060101); H02P 6/10 (20060101); H02K 023/16 ()

Expiration Date: 01/28/2020