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Rotor and Motor

A technology for rotors and motors, applied in the direction of magnetic circuit rotating parts, magnetic circuit shape/style/structure, electromechanical devices, etc., can solve the problems of torque reduction, air gap widening, etc., and achieve the goal of increasing torque and preventing magnetic flux leakage Effect

Active Publication Date: 2022-02-08
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the case of Patent Document 2, since the magnet is held by the cover of the non-magnetic member, there is a concern that the air gap will widen and the torque will decrease.

Method used

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Embodiment Construction

[0019] Hereinafter, a rotor and a motor according to embodiments of the present invention will be described with reference to the drawings. In addition, the scope of the present invention is not limited to the following embodiments, and can be changed arbitrarily within the scope of the technical idea of ​​the present invention. In addition, in the following drawings, in order to facilitate understanding of each structure, the actual structure may be different from the scale, number, etc. in each structure.

[0020] In addition, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional rectangular coordinate system. In the XYZ coordinate system, the Z-axis direction is the same as figure 1 The axial parallel direction of the central axis J is shown. The X-axis direction is the direction perpendicular to the Z-axis direction, and is figure 1 left and right directions. The Y-axis direction is a direction perpendicular to the two directions of th...

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PUM

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Abstract

The invention provides a rotor and a motor. The rotor is a rotor of an alternating motor, wherein the rotor has: a shaft that rotates about a central axis extending in an up-down direction; a rotor core fixed to the shaft; and a plurality of magnets that Arranged on the surface of the rotor core, provided at intervals in the circumferential direction around the central axis; and a cover member that holds the magnet on the surface of the rotor core, and the rotor core The core has: a plurality of salient pole portions provided between the magnets adjacent in the circumferential direction to protrude radially outward about the central axis; and a plurality of concave portions respectively located in the salient pole portions. Both sides in the circumferential direction of the rotor core are recessed radially inward, the cover member is made of a magnetic material, and each of the magnets is pressed radially inward between the adjacent salient pole portions in the circumferential direction of the rotor core. to the rotor core.

Description

technical field [0001] The invention relates to rotors and motors. Background technique [0002] Generally, an alternating type rotor has a bridge portion connecting a real pole portion (magnetic pole constituted by a magnet) and a pseudo pole portion (magnetic pole constituted by an iron core). Patent Document 1 discloses an alternating rotor having bridges. However, compared with the case without the bridge portion, the leakage magnetic flux increases and the magnetic flux contributing to the torque decreases when the bridge portion is present. [0003] For example, in the case of a rotor core composed of an electromagnetic steel sheet with bridges and an electromagnetic steel sheet without bridges, the leakage paths of magnetic flux are reduced, but leakage flux from the bridges cannot be avoided. In addition, even if it is intended to reduce the thickness of the bridge portion, the minimum thickness of the bridge portion depends on the plate thickness, so it is difficu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27
CPCH02K1/278
Inventor 田中邦明
Owner NIDEC CORP