Rotor assembly for motor

a technology for rotating parts and motors, which is applied in the direction of rotating parts of magnetic circuits, liquid fuel engines, magnetic circuit shapes/forms/constructions, etc., and can solve problems such as deterioration of driving motor performance and damage to permanent magnets

Active Publication Date: 2019-09-19
HYUNDAI MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure provides a rotor assembly for a motor that includes a rotor shaft, a permanent magnet, and a sleeve. The rotor shaft includes a cylindrical journal portion and a cylindrical center shaft portion with a smaller radius. The permanent magnet is inserted into the center shaft portion and is supported by the journal portion and the center shaft portion in the axial direction. The sleeve is inserted into the rotor shaft to surround the outer circumferential surface of the permanent magnet and the center shaft portion in the radial direction. The sleeve includes a first portion and a second portion integrally formed with the first portion, with the second portion having a larger radius than the first portion. The first and second portions support the outer circumferential surfaces of the journal portion and the center shaft portion in the radial direction. The rotor shaft also includes a rib portion protruding in the radial direction from the rear side end of the journal portion. The rotor assembly provides improved performance and stability of the motor.

Problems solved by technology

However, in the related art, the permanent magnet may be damaged in the process of cutting the permanent magnet to a semicircular shape, bonding, and grinding the permanent magnet as described above.
Also, the related art uses an unnecessary process such as cutting and bonding the permanent magnet.
Further, in the related art, if the permanent magnets cut off from each other are not accurately bonded or the bonded portions (clearance portions) of the permanent magnets are assembled to deviate in a circumferential direction from the center, performance of the driving motor may be deteriorated.

Method used

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Examples

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Embodiment Construction

[0041]It is understood that the term “vehicle” or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle that has two or more sources of power, for example both gasoline-powered and electric-powered vehicles.

[0042]The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms “a,”“an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It wil...

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PUM

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Abstract

A rotor assembly for a motor includes a rotor shaft having a journal portion formed in an axial direction and having a predetermined radius about an axis, and a center shaft portion extending along the axial direction from the journal portion and having a radius smaller than a radius of the journal portion about the axis; a cylindrical, integral permanent magnet inserted into the center shaft portion to surround an outer circumferential surface of the center shaft portion and being supported by the journal portion; and a sleeve inserted into the rotor shaft to surround an outer circumferential surface of the journal portion and an outer circumferential surface of the integral permanent magnet, supporting the integral permanent magnet in the axial direction, and supporting the outer circumferential surface of the center shaft portion in the radial direction.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims under 35 U.S.C. § 119(a) the benefit of Korean Patent Application No. 10-2018-0030379 filed in the Korean Intellectual Property Office on Mar. 15, 2018, the entire contents of which are incorporated herein by reference.BACKGROUND(a) Technical Field[0002]The present disclosure relates to a rotor assembly for a motor, more particularly, to the rotor assembly for the motor of an electric air compressor employed in a fuel cell system of a fuel cell vehicle.(b) Description of the Related Art[0003]In general, a fuel cell vehicle includes a fuel cell system that generates electric energy through an electrochemical reaction between hydrogen and air by a fuel cell as a power supply source for driving a driving motor.[0004]The fuel cell system includes a stack of fuel cells, a hydrogen supply system that supplies hydrogen to the stack, an air supply system that supplies air to the stack, and a cooling system that cools heat g...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04D25/06F04D29/053H02K7/18H02K1/27
CPCH02K1/2733F05B2240/60F04D25/0606H02K7/1823F04D29/284F04D29/053F05B2220/7068H02K1/2706H02K1/28H02K7/003F04D29/054Y02T10/70Y02T90/40Y02E60/50H02K5/163H02K7/14B60L50/72H01M8/04089F04D17/10F04D29/624
Inventor LEE, CHANG HAKIM, HYUNYOO
Owner HYUNDAI MOTOR CO LTD
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