Electric brush motor for electric power turning device

An electric power steering, electric motor technology, applied in power steering mechanism, electric steering mechanism, electromechanical device, etc., can solve problems such as poor steering feel, reduction of motor boost torque, and increased noise.
CN1512647AInactive Publication Date: 2004-07-14MITSUBISHI ELECTRIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MITSUBISHI ELECTRIC CORP
Publication Date
2004-07-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

A brush motor for an electric power steering system comprises a four-pole field portion 3, an armature 4 having windings 9 wound around a core 5 with 22 slots 8 to constitute a lap winding, hooks 12 which are formed on one ends of 22 commutator segments 10 respectively and on which the windings 9 are hooked, and a cylindrical commutator 7 constructed by molding integrally the commutator segments 10 with a resin, and four brushes 18 which contact slidably to outer peripheral surfaces of the commutator segments 10, wherein, when the commutator 7 to which a sliding contact portion of the brush 18 contacts is sectioned perpendicularly to an axial direction, a relationship of 0.18<=(AxN) / (DxD)<=0.23 is satisfied,where A is a sectional area of one commutator segment, N is a number of the commutator segments, and D is a diameter of outer peripheral surfaces of the commutator segments.
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Description

technical field

[0001] The present invention relates to reducing the brush temperature of a brush motor for an electric power steering apparatus, the motor having a cylindrical commutator having a plurality of commutator segments fixed with resin, and sliding on the outer peripheral surface of the commutator segments of the commutator. Contact brushes. Background technique

[0002] In the existing brush motors for electric power steering devices, in order to reduce the temperature rise of the brushes, in addition to increasing the drop rate of the motor current, suppressing heat generation, or increasing the shape of the motor itself to increase the heat capacity, there are also tight Paste the brush holder device to absorb and dissipate the heat generated by the brush and reduce the temperature rise of the brush and other methods (for example, refer to Patent Document 1).

[0003] [Patent Document 1]

[0004] Japanese Patent Laid-Open No. 2002-153022 (paragraph

[0005] [000...

Claims

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