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Rotational position sensing apparatus

A technology for rotating position and sensing equipment, applied in the direction of converting sensor output, electromechanical devices, measuring devices, etc., can solve the problems of long processing time and inability to form fixed components at low cost

Active Publication Date: 2014-03-26
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case where the protrusion is formed in the fixing member through a machining process, the processing time is relatively long, and thus the fixing member cannot be formed at low cost.
Furthermore, in the case where the protrusions are formed in the fixing member by a hydroforming process, advanced forming techniques are required, and thus the fixing member cannot be formed at low cost

Method used

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Examples

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Embodiment Construction

[0016] Embodiments of the present disclosure will be described. In the present embodiment, the rotational position sensing device of the present disclosure is applied to an electric motor of an electric power steering device mounted in a vehicle such as an automobile.

[0017] First, refer to Figures 1 to 6 The structure of the electric motor of this embodiment will be described.

[0018] like figure 1 As shown in , an electric motor 1 serving as a power generating / electric machine of the present disclosure includes a housing 10 , a stator 11 , a rotor (serving as a rotatable body) 12 , a rotational position sensing device 13 and a control device 14 . Generally, a generating / electric machine is defined as a device used to convert mechanical energy to electrical energy or vice versa. Therefore, although the generator-motor of the present disclosure is implemented as an electric motor in the present embodiment, the generator-motor of the present disclosure may be implemented...

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Abstract

A rotational position sensing apparatus includes a rotational position sensing magnet (130) and a fixing member (131). The fixing member (131) is made of a non-magnetic material and is fixed to a rotatable shaft (120) of a rotor (12). The fixing member (131) includes a plurality of projections (131c-131j), which radially inwardly project and are arranged one after another in a circumferential direction at an inner peripheral surface of a first peripheral wall portion (131a) within a space (131p), which is defined by the first peripheral wall portion (131a) and a bottom wall portion (131b) and holds the rotational position sensing magnet (130).

Description

technical field [0001] The present disclosure relates to a rotational position sensing device. Background technique [0002] For example, DE102008040318A1 teaches a rotational position sensing device which senses the rotational position of a rotatable body, more particularly a rotational position of a rotor of an electric motor. [0003] The rotational position sensing device includes a rotational position sensing magnet, a fixing member, and a magnetic sensor. The rotational position sensing magnet generates magnetic flux for sensing the rotational position of the rotor with the magnetic sensor. The stationary member holds the rotational position sensing magnet and is configured in the form of a cylindrical cup. The fixing member is fixed to an inner ring of a bearing that rotatably supports the rotor. The fixing member includes a peripheral wall portion, a bottom wall portion, and a protrusion (ridge). The peripheral wall portion is configured in a cylindrical tubular ...

Claims

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Application Information

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IPC IPC(8): H02K11/00
CPCG01B7/30G01D5/00G01D11/30G01D5/145
Inventor 谷口真若菜刚志今井博史后藤昌宏
Owner DENSO CORP
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