Title:
BRUSHLESS MOTOR AND WIPER DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/157558
Kind Code:
A1
Abstract:
A brushless motor provided with a stator (21) having armature coils (21a, 21b, 21c), a rotor (22) caused to rotate by a rotating magnetic field, and a switching element (30a), wherein the brushless motor is characterized by: having a rotation number control unit (33) for switching between a low-speed mode and a high-speed mode; in the low-speed mode, the rotation number control unit (33) supplying current at a predetermined energization timing to the armature coils (21a, 21b, 21c), and controlling the number of rotations of the rotor (22) by controlling the duty ratio; and, in the high-speed mode, the rotation number control unit (33) supplying a current to the armature coils (21a, 21b, 21c) at an energization timing more advanced than the energization timing in the low-speed mode, and thereby performing magnetic-field weakening control that makes the rotating magnetic field weaker than in the low-speed mode and controlling the number of rotations of the rotor (22).
Inventors:
KIMURA MASAAKI (JP)
TANAKA HIROTO (JP)
IWAZAKI TAMOTSU (JP)
ANNAKA TOMOHIKO (JP)
KOJIMA NAOKI (JP)
KITAZAWA JUNYA (JP)
TANAKA HIROTO (JP)
IWAZAKI TAMOTSU (JP)
ANNAKA TOMOHIKO (JP)
KOJIMA NAOKI (JP)
KITAZAWA JUNYA (JP)
Application Number:
PCT/JP2013/061336
Publication Date:
October 24, 2013
Filing Date:
April 16, 2013
Export Citation:
Assignee:
MITSUBA CORP (JP)
International Classes:
H02P6/08; B60S1/08; H02K11/00
Domestic Patent References:
| WO2011121792A1 | 2011-10-06 |
Foreign References:
| JP2010017055A | 2010-01-21 | |||
| JP2010093977A | 2010-04-22 | |||
| JP2008174177A | 2008-07-31 | |||
| JP2011230670A | 2011-11-17 | |||
| JP2007202391A | 2007-08-09 | |||
| JP2007143278A | 2007-06-07 | |||
| JP2010093977A | 2010-04-22 |
Other References:
See also references of EP 2840700A4
Attorney, Agent or Firm:
TSUTSUI, Yamato et al. (JP)
Tsutsui Daiwa (JP)
Tsutsui Daiwa (JP)
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