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Motor

一种马达、传感器的技术，应用在马达领域，能够解决可靠性低、没有安全装置永磁体等问题

Active Publication Date: 2008-09-03
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, conventional motors include magnetic sensors and permanent magnets arranged in the same space as the stator and rotor without special safety devices to protect the permanent magnets from damage
In addition, motors with conventional resolvers are less reliable because they do not have special safety devices to prevent damage to the resolver

Method used

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Examples

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Embodiment Construction

[0018] Note that in the description of the preferred embodiments of the present invention herein, words such as up, down, left, right, up, down, top, and bottom used to describe the positional relationship and direction between the various components only indicate the positions in the drawings. and directions. These terms do not indicate the positional relationship and orientation of components installed in an actual device. It should also be noted that the reference numerals, figure numbers and supplementary notes shown below are used to help readers find corresponding components in the following description of the preferred embodiments to facilitate understanding of the present invention. It should be understood that these expressions in no way limit the scope of the present invention.

[0019] Fig. 1 is a schematic diagram of a power steering unit 8 (for example, EPS (Electric Power Steering)) having a motor 1 according to a first preferred embodiment of the present invent...

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PUM

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Abstract

A motor includes a sensor which magnetically detects an angular position centered about a central axis of a rotor core with respect to an armature. The sensor preferably includes a yoke which has a substantially annular shape, is made of a magnetic material, is arranged substantially perpendicularly to the central axis and is affixed to a shaft, a sensor magnet affixed at the yoke, a magnet cover which covers a surface of the sensor magnet other than a portion in contact with the yoke, a first Hall element and a second Hall element both of which are arranged facing in an axial direction a surface of the sensor magnet opposite from a surface thereof at which the yoke is arranged. Since the sensor magnet is covered by the yoke and the magnet cover, even when the sensor magnet is damaged, the damaged sensor magnet is prevented from damaging other components of the motor. By virtue of such configuration, the reliability of the motor is improved.

Description

technical field [0001] The invention relates to a motor. Background technique [0002] Traditionally, hydraulic power steering has been utilized in vehicles such as passenger cars to assist the operator in steering the vehicle. Hydraulic power steering utilizes a pump operated by the vehicle's engine to generate force that assists the operator in steering operations. In recent years, electric power steering systems utilizing motors operated by vehicle batteries have become available. The system is more efficient than traditional hydraulic power steering. [0003] Conventionally, a motor for driving an electric power steering system may include a magnetic sensor and a permanent magnet for detecting a rotational position of a rotor relative to a stator. [0004] Also conventionally, a motor for driving an electric power steering system may have a generally cylindrical shape with a cylindrical stator and a rotor disposed within the stator. In this motor, a resolver that det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K11/00
CPCH02K11/0021H02K11/215
Inventor 片冈央右田贵之芳贺英博
Owner NIDEC CORP
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