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A motor and stator core technology, applied in the direction of the casing/cover/support, magnetic circuit shape/style/structure, electrical components, etc., can solve the problem of no setting of the outer diameter of the stator core, single outer diameter, etc., to reduce Iron loss, the effect of improving energy efficiency

Inactive Publication Date: 2016-08-10
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the stator core of JP-A-2008-283838, both the part covered by the front cover or the rear cover and the part not covered have a single outer diameter.
That is, in Japanese Patent Laid-Open No. 2008-283838, the outer diameter of the stator core is not effectively set according to the outer diameter of the motor

Method used

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Embodiment Construction

[0051] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. Hereinafter, the direction along the central axis of the motor will be referred to as the up-down direction, and the side of the large-diameter portion relative to the small-diameter portion of the stator core will be referred to as up, and the shape and positional relationship of each part will be described. However, this is only an up-down direction defined for convenience of description, and does not limit the posture of the motor of the present invention during use.

[0052]

[0053] figure 1 It is a longitudinal sectional view of a motor according to an embodiment of the present invention. Such as figure 1 As shown, the motor 1A has a stationary part 2A and a rotating part 3A. The rotating part 3A rotates around the central axis 9A extending vertically.

[0054] The rotating unit 3A has a shaft 31A, a rotor holder 32A, and a magnet 33A. The shaft 31A...

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Abstract

The present invention provides a motor, and is characterized in that: a housing used for maintaining a stator core has a bottom which is arranged closer to a lower side than a coil and an outside cylinder part which is extended upwards from a periphery part of the bottom; the stator core has a small diameter part which is arranged at a radial inner side of the outside cylinder part and a large diameter part which is arranged at a position closer to an upper side than the small diameter part and has a peripheral surface having the diameter larger than the diameter of a peripheral surface of the small diameter part and in an approximately cylinderical shape; and the peripheral surface of the large diameter part is exposed from the housing, thus iron loss caused by contact with the housing can be reduced; in addition, a magnetic circuit in the stator core can be enlarged at the large diameter part, thus iron loss of the stator core can be reduced; as a result, an energy efficiency of the motor can be raised.

Description

technical field [0001] The present invention relates to an inner rotor type motor. Background technique [0002] Conventionally, an inner rotor type motor in which a rotating portion having a magnet is rotated inside a coil has been known. For example, Japanese Patent Application Laid-Open No. 2006-109575 describes a brushless motor including a rotor having magnets and a stator disposed on the outer peripheral side of the rotor. Also, JP-A-2008-283838 describes an inner rotor type motor having a stator core excited by coils and a rotor rotatably supported with respect to the stator core. [0003] The brushless motor in Japanese Patent Application Laid-Open No. 2006-109575 has a cylindrical cover with a bottom as a member for holding the stator (paragraphs 0003, 0039, figure 1 ). Furthermore, the cover portion covers the outer peripheral surface of the stator core. Therefore, in the structure of JP 2006-109575 A, iron loss occurs in the vicinity of the outer peripheral su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/14H02K5/16
Inventor 本田武北垣宏
Owner NIDEC CORP
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