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Title:
MOTOR AND BRUSHLESS WIPER MOTOR
Document Type and Number:
WIPO Patent Application WO/2019/198464
Kind Code:
A1
Abstract:
Provided are a motor and a brushless wiper motor capable of preventing a rotor core from stopping at a rotation angle where permanent magnets are most easily demagnetized when the ratio of the number of magnetic poles of the permanent magnets to the number of teeth is 2:3. The motor is provided with: a rotor core 32; a plurality of permanent magnets 33 disposed on the outer circumferential surface 32b of the rotor core 32 and magnetized in parallel orientation; and a salient pole 35 saliently formed between the permanent magnets 33 adjacent in the circumferential direction of the outer circumferential surface 32b of the rotor core 32. The ratio of the number of magnetic poles of the permanent magnets 33 to the number of teeth is 2:3. Sloped surfaces 33e are formed on the side surfaces of the permanent magnets 33 in the circumferential direction. The angle θ2 between lines L3 and lines L2 is an electrical angle of 13°or more, said lines L3 connecting outer circumferential corner portions 33f where the sloped surfaces 33e and the outer circumferential surface 33a are connected to each other and the shaft center C1, said lines L2 connecting the radial direction outermost side of the circumferential direction side surface of the salient pole 35 and the shaft center C1.

Inventors:
OHORI,Ryo (2681 Hirosawa-cho 1-chome, Kiryu-sh, Gunma 55, 〒3768555, JP)
Application Number:
JP2019/012074
Publication Date:
October 17, 2019
Filing Date:
March 22, 2019
Export Citation:
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Assignee:
MITSUBA CORPORATION (2681, Hirosawa-cho 1-chome Kiryu-sh, Gunma 55, 〒3768555, JP)
International Classes:
H02K1/22; H02K1/27; H02K21/14
Domestic Patent References:
WO2017002873A12017-01-05
WO2014167645A12014-10-16
Foreign References:
JP2006081383A2006-03-23
JP2005065417A2005-03-10
JP2008245406A2008-10-09
JP2004048970A2004-02-12
JP2016175638A2016-10-06
Attorney, Agent or Firm:
UNIUS PATENT ATTORNEYS OFFICE (First Shin-Osaka MT Bldg. 2nd Floor, 5-13-9 Nishinakajima Yodogawa-ku, Osaka-sh, Osaka 11, 〒5320011, JP)
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