Title:
ブラシレスモータ駆動制御回路及びそれを用いたブラシレスモータ装置
Document Type and Number:
Japanese Patent JP4514108
Kind Code:
B2
Abstract:
There is provided a brushless motor drive control circuit capable of assuring an S/N ratio of a predetermined counter electromotive voltage and suppressing lowering of efficiency of a brushless motor at a high-speed rotation. More specifically, the brushless motor drive control circuit includes: counter electromotive voltage filter circuits for inputting 3-phase counter electromotive voltage induced at the end of each of the stator coils and switching between a first and a second time constant according to the rotation speed of the rotor so as to pass a low-range frequency component corresponding to the time constant; counter electromotive voltage detection comparators for inputting the counter electromotive voltage which has passed through the counter electromotive voltage filter circuit and comparing it with voltage at a neutral point so as to output counter electromotive voltage polarity signals as the comparison results; and a motor driver control circuit for switching/controlling the time constant of the counter electromotive filter circuits and controlling the motor driver according to the counter electromotive voltage polarity signals.
Inventors:
Maeda Kihiro
Application Number:
JP2004160355A
Publication Date:
July 28, 2010
Filing Date:
May 28, 2004
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H02P6/18; H02P6/06; H02P6/08; H02P6/182
Domestic Patent References:
| JP63039490A |
Foreign References:
| WO2003036787A1 |
Attorney, Agent or Firm:
Tsuneo Fujikawa