Title:
モータ駆動回路
Document Type and Number:
Japanese Patent JP5726572
Kind Code:
B2
Abstract:
A motor driving circuit includes an inverter circuit which supplies a driving current to a coil of a single phase brushless DC motor, a position detection sensor which detects a magnetic pole position of a magnet rotor of the motor and outputs a position detection signal, and a controller which controls the inverter circuit based on the position detection signal and a speed instruction signal for instructing a rotating speed of the motor. At a time of startup of the motor, the controller makes a pulse width of a PWM signal for controlling the inverter circuit constant in a first time period which starts after the position detection signal zero-crosses and lasts until the position detection signal zero-crosses next time, and narrows the pulse width of the PWM signal as time elapses in a second time period immediately after the first time period.
Inventors:
Takahiro Sakaguchi
Application Number:
JP2011042305A
Publication Date:
June 03, 2015
Filing Date:
February 28, 2011
Export Citation:
Assignee:
Minebea Co., Ltd.
International Classes:
H02P6/10; H02P6/06; H02P6/08; H02P6/26
Domestic Patent References:
| JP2007174778A | ||||
| JP2007060862A | ||||
| JP2008109805A |
Attorney, Agent or Firm:
Hirohito Katsunuma
Yasukazu Sato
Yasushi Kawasaki
Takeshi Sekine
Akaoka Akira
Yasukazu Sato
Yasushi Kawasaki
Takeshi Sekine
Akaoka Akira