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Rotor of electric motor, and method for manufacturing rotor

a technology of electric motors and rotors, which is applied in the direction of dynamo-electric machines, magnetic circuit rotating parts, and shape/form/construction of magnetic circuits, etc., and can solve problems such as magnets or cover tubes being broken

Inactive Publication Date: 2019-11-07
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]In general, such a rotor is produced by injecting resin to the gap using an injection machine. In this instance, each magnet or the cover tube abuts with a mold of the injection machine, and thus, the magnets or the cover tube may be broken.

Problems solved by technology

In this instance, each magnet or the cover tube abuts with a mold of the injection machine, and thus, the magnets or the cover tube may be broken.

Method used

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  • Rotor of electric motor, and method for manufacturing rotor
  • Rotor of electric motor, and method for manufacturing rotor
  • Rotor of electric motor, and method for manufacturing rotor

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Embodiment Construction

[0022]Embodiments of the invention will be described below in detail based on the drawings. First, with reference to FIGS. 1 and 2, a rotor 10 according to an embodiment of the invention will be described.

[0023]Note that, in the following description, an axial direction corresponds to a direction along a rotational axis O of the rotor, a radial direction corresponds to a radial direction of a circle centered about the axis O, and a circumferential direction corresponds to the circumferential direction of the circle. Further, for convenience, the left direction in FIGS. 1, 3, and 6 to 13 corresponds to the front direction in the axial direction (axially frontward).

[0024]The rotor 10 is rotatably arranged radially inside of a stator (not shown) of an electric motor, and constitutes the electric motor together with the stator. The rotor 10 includes a rotary shaft 12, a rotor core 14, a plurality of magnets 16, a cover tube 18, and resin 20. The rotary shaft 12 is a columnar member exte...

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PUM

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Abstract

A rotor capable of preventing a magnet or a cover tube from being damaged by contacting a mold of an injection machine during production. The rotor includes a rotor core, a plurality of magnets arranged on the outside of the rotor core in the radial direction, a cylindrical cover tube surrounding the plurality of magnets, and resin charged to a gap defined between an outer peripheral surface of the rotor core and an inner peripheral surface of the cover tube. An axial dimension of the rotor core is greater than an axial dimension of each magnet, and an axial dimension of the cover tube.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This is a divisional application of U.S. application Ser. No. 15 / 397,838, filed Jan. 4, 2017, which claims the benefit of priority from Japanese Patent Application No. 2016-003638, filed on Jan. 12, 2016, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The invention relates to a rotor of an electric motor, and a method for manufacturing a rotor.2. Description of the Related Art[0003]A rotor of an electric motor, which includes a rotor core, a plurality of magnets arranged on the outside of the rotor core in the radial direction, a cylindrical cover tube surrounding the magnets, and resin charged to a gap between the rotor core and the cover tube, has been known (for example, Japanese Unexamined Patent Publication (Kokai) No. 2013-169103).[0004]In general, such a rotor is produced by injecting resin to the gap using an injection machine. In this instance, each magnet or th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02K1/27H02K15/03H02K15/14
CPCH02K1/2706H02K15/03H02K1/278H02K15/14H02K15/12
Inventor YAMADA, YASUONISHIFUKUMOTO, AKIRA
Owner FANUC LTD