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Rotation detection device and motor

A technology of rotation detection and rotation axis, applied in electromechanical devices, using electric/magnetic devices to transfer sensing components, electrical components, etc., can solve problems such as connection work and molding work troubles

Active Publication Date: 2016-04-27
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the structure of fixing the sensor magnet as described in Japanese Patent Laid-Open Nos. 2002-34207 and 2005-160161 requires a special mechanism to fix the sensor magnet to the holding member
In addition, the joining work and forming work described in the aforementioned documents are cumbersome

Method used

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  • Rotation detection device and motor
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  • Rotation detection device and motor

Examples

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Embodiment Construction

[0018] An embodiment of the present invention will now be described with reference to the accompanying drawings.

[0019] Such as figure 1 As shown, in this embodiment, the motor 11 is a so-called gear motor, and is used in, for example, a power window device. The motor 11 includes a motor main body 12 and a reduction unit 13 . The motor main body 12 includes a yoke housing 14 , two magnets 15 , an armature 16 , a brush holder 17 , and two brushes 18 .

[0020] The yoke housing 14 is tubular and has closed ends. Two magnets 15 are fixed to the inner surface of the yoke housing 14 . The armature 16 is rotatably housed inside the magnet 15 in the yoke housing 14 . The rotary shaft 20 passes through the armature 16 and includes a base end portion supported by a bearing 19 provided at the center portion of the closed end portion of the yoke housing 14 . The flange 14b extends radially outward from the open end 14a of the yoke housing 14 . The reduction unit 13 includes a gea...

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Abstract

The invention relates to a rotation detection device and a motor. The rotation detection device includes a sensor magnetic body and a detection element. The sensor magnetic body is circular, and is maintained by a maintaining part, so the sensor magnetic body can rotate with a rotation shaft. The sensor magnetic body includes a first end face and a second end face which are along the axial direction, and internal and external circumferential faces. The maintaining part includes a contact part which contacts with the first end face and an elastic extending part which extends along the axial direction and faces to the internal circumferential face or the external circumferential face of the sensor magnetic body. The elastic extending part deforms along the axial direction, and includes a contact protruding part which extends along the axial direction and contacts the second end face of the sensor magnetic body. The sensor magnetic body is connected with the maintaining part along the axial direction, and is supported by two sides of the contact part and the contact protruding part which are opposite to each other along the axial direction.

Description

technical field [0001] The invention relates to a rotation detection device and a motor. technical background [0002] Motors used in power window devices, power sunroof devices, and the like include a rotation sensor that detects the rotational state of the motor's rotating shaft to prevent foreign matter from getting caught between the moving body and the window frame. The rotation sensor includes a sensor magnet held by a holding member so as to be rotatable integrally with the rotation shaft, and a detection element which may be a Hall IC provided on a fixed body. [0003] Japanese Patent Laid-Open No. 2002-34207 describes a method of thermally bonding a holding member, which is a part of a drive-side rotary body of a joint that rotates integrally with the rotary shaft, to fix a sensor magnet to a rotary shaft. Japanese Patent Laid-Open No. 2005-160161 describes a method of insert molding a sensor magnet and embedding the sensor magnet in a holding member. [0004] How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K11/215
CPCG01D5/12H02K11/20
Inventor 本田哲也
Owner DENSO CORP
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