Title:
ブラシレスモータ駆動回路
Document Type and Number:
Japanese Patent JP4680367
Kind Code:
B2
Abstract:
A motor drive circuit for driving a brushless motor having a rotor and exciting coils of respective phases. A square wave rotor position signal for each phase is produced wherein a half period of the rotor position signal corresponds to a time period from a polarity inversion of an induced voltage of the exciting coil to the next polarity inversion of the induced voltage. Based on the rotor position signal, excitation of the exciting coils is performed by controlling switching elements for conducting excitation currents by using square wave on-control and/or pulse width converted square wave pulse width modulation (PWM) control. A pulse width converted sinusoidal wave PWM signal is generated whose pulse width varies according to a sinusoidal function. Excitation of the exciting coils is controlled based on the pulse width converted sinusoidal wave PWM signal immediately before and after the square wave on-controlled portions and/or the pulse width converted square wave PWM controlled portions.
Inventors:
Tsuyoshi Mitsuda
Application Number:
JP2000308996A
Publication Date:
May 11, 2011
Filing Date:
October 10, 2000
Export Citation:
Assignee:
Renesas Electronics Corporation
International Classes:
H02P6/08; H02P6/06; H02P6/10; H02P6/18; H02P6/182; H02P6/28
Domestic Patent References:
| JP8126381A | ||||
| JP4087594A | ||||
| JP7222454A | ||||
| JP10174482A | ||||
| JP61106087A | ||||
| JP2000245190A |
Attorney, Agent or Firm:
Ken Ieiri