Title:
BRUSHLESS MOTOR
Document Type and Number:
WIPO Patent Application WO/2008/050637
Kind Code:
A1
Abstract:
A brushless motor (3) is provided with a rotor (22) having a magnet (33), and a stator
(21) having teeth (27) facing the magnet (33) through an air gap (45). At the leading
ends of the teeth (27), a plurality of auxiliary grooves (20) which face the air
gap (45) are formed. A ratio W/S of the groove width (S) of the auxiliary groove
(20) and the opening width (W) of an opening section (46) between the adjacent
teeth (27) satisfies inequalities of 0.9≤W/S≤1.1. A ratio θs/θw
of an angle (θw) between the center (M1) of the opening section
(46) and the center (M2) of the auxiliary groove (20) and an angle (θs)
between the centers (M2) of the adjacent auxiliary grooves (20) is
set within a range of 0.66≤θs/θw≤0.965.
Inventors:
OKUBO MASAYUKI (JP)
Application Number:
PCT/JP2007/070173
Publication Date:
May 02, 2008
Filing Date:
October 16, 2007
Export Citation:
Assignee:
MITSUBA CORP (JP)
OKUBO MASAYUKI (JP)
OKUBO MASAYUKI (JP)
International Classes:
H02K1/16; B62D5/04; H02K29/00
Foreign References:
| JPH1042531A | 1998-02-13 | |||
| JP2003061272A | 2003-02-28 | |||
| JPH08308198A | 1996-11-22 | |||
| JP2004194489A | 2004-07-08 |
Attorney, Agent or Firm:
TAKANO, Yasushi (Miyamasuzaka-Toho-Estate 602 1-12-12, Shibuy, Shibuya-ku Tokyo 02, JP)
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