MOTOR AND BRUSHLESS WIPER MOTOR

Title:

MOTOR AND BRUSHLESS WIPER MOTOR

Document Type and Number:

WIPO Patent Application WO/2020/100457

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide a technique for suppressing the occurrence of vibration and noise caused by an SPM brushless motor which has segment magnets as the magnetic circuit. This motor is provided with: a stator which has an annular stator core and multiple teeth protruding radially inwards from the inner peripheral surface of the stator core; a coil which is wound around the teeth; a shaft which rotates around the rotation axis radially inside of the stator core; a rotor core which is fixed to the shaft and which has the rotation axis as the radial center; magnets which are positioned on the outer peripheral surface of the rotor core; a salient pole which is positioned between magnets adjacent to each other in the circumferential direction on the outer peripheral surface of the rotor core and which protrudes radially outwards beyond the circumferential-direction end of the magnets; an applying unit which applies a voltage to the coil; and an applying control unit which controls the applying unit. The ratio of the number of magnetic poles of the magnets and the number of teeth is 2:3, the aforementioned voltage is a square wave, and application of the voltage is started at a time when the tip of the salient pole does not face an opening in the teeth.

Inventors:

OHORI RYO (JP)
SHIODA NAOKI (JP)

Application Number:

PCT/JP2019/038746

Publication Date:

May 22, 2020

Filing Date:

October 01, 2019

Export Citation:

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Assignee:

MITSUBA CORP (JP)

International Classes:

H02P6/10; B60S1/08; H02K1/27; H02P6/15

Foreign References:

JP2013085407A	2013-05-09
JP2000312447A	2000-11-07
JP2011004583A	2011-01-06
JP2004015968A	2004-01-15
JP2005210828A	2005-08-04
JP2016214081A	2016-12-15

Other References: