Rotary electric machine and bearing changing method

Patent metadata

Field	Value
Publication number	US-9401629-B2
Application number	US-201114123386-A
Country	US
Kind code	B2
Filing date	Jun 2, 2011
Priority date	Jun 2, 2011
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A rotary electric machine includes a stator core; a rotor that includes a laminated core, core holders, and cooling fans; a frame that includes a tubular unit that encloses the stator core and the rotor, and a first bracket and a second bracket that extend in a direction of a rotor shaft and supports the rotor shaft; and cartridges that are detachably attached to the first bracket and the second bracket and rotatably supports the rotor shaft, wherein groove-like or hole-like holding portions, which hold end portions of bearing attaching and detaching jigs inserted through the first bracket and the second bracket, are provided in the cooling fans.

First claim

The invention claimed is:

1. A rotary electric machine comprising:
a stator;
a rotor that includes
a rotor core that is arranged on an inner peripheral side of the stator and is formed by laminating magnetic steel sheets,
a core holder that covers both ends of the rotor core, and
a cooling fan that is attached to the core holder;

a frame that includes
a tubular unit that encloses the stator and the rotor, and
a rotor shaft supporting unit that supports the rotor shaft; and

a bearing unit that is detachably attached to the rotor shaft supporting unit and rotatably supports the rotor shaft, wherein
the cooling fan includes a main plate that is formed such that a diameter of the main plate increases toward the bearing unit from the core holder,
a groove-like or hole-like holding portion, configured to hold an end portion of a bearing attaching and detaching jig inserted through the rotor shaft supporting unit, is provided in the main plate, and
the main plate includes a thick portion that is thicker than a portion in which the holding portion is not provided.

2. The rotary electric machine according to claim 1 , wherein
the groove-like holding portion is provided along a circumferential direction of the cooling fan, and
a plurality of the hole-like holding portions are provided on a concentric circle centered on an axial center portion of the rotor shaft.

3. The rotary electric machine according to claim 1 , wherein
a side surface of the holding portion is formed in a tapered shape such that the end portion of the bearing attaching and detaching jig is capable of coming into contact with the side surface of the holding portion, and
a non-contact portion is formed between the end portion and a bottom surface of the holding portion.

4. A bearing changing method of changing a bearing unit, which is applied to a rotary electric machine that includes a stator; a rotor that includes a rotor core that is arranged on an inner peripheral side of the stator and is formed by laminating magnetic steel sheets, a core holder that covers both ends of the rotor core, and a cooling fan that is attached to the core holder; a frame that includes a tubular unit that encloses the stator and the rotor, and a rotor shaft supporting unit that supports the rotor shaft; and the bearing unit that is detachably attached to the rotor shaft supporting unit and rotatably supports the rotor shaft, and in which the cooling fan includes a main plate that is formed such that a diameter of the main plate increases toward the bearing unit from the core holder, a groove-like or hole-like holding portion, configured to hold an end portion of a bearing attaching and detaching jig inserted through the rotor shaft supporting unit, is provided in the main plate, and the main plate includes a thick portion that is thicker than a portion in which the holding portion is not provided, the bearing changing method comprising:
a jig attaching step of attaching the bearing attaching and detaching jig to the rotor shaft supporting unit;
a rotor fixing step of causing the holding portion to hold an end portion of the bearing attaching and detaching jig and fixing the rotor by screwing the bearing attaching and detaching jig into the rotor shaft supporting unit; and
a bearing changing step of detaching the bearing unit from the rotor shaft supporting unit and attaching a new bearing unit to the rotor shaft supporting unit.

5. The bearing changing method according to claim 4 , wherein
the groove-like holding portion is provided along a circumferential direction of the cooling fan, and
a plurality of the hole-like holding portions are provided on a concentric circle centered on an axial center portion of the rotor shaft.

6. The bearing changing method according to claim 4 , wherein the end portion of the bearing attaching and detaching jig is formed in a tapered shape such that a top portion of the holding portion is capable of coming into contact with the end portion before the end portion reaches a bottom surface of the holding portion.

Assignees

• Kaneko Kenta
• Mitsubishi Electric Corp

Inventors

• Kaneko Kenta

Classifications

• H02K5/1732

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title

• F16C35/042

  Housings for rolling element bearings for rotary movement · CPC title

• H02K9/08 Primary

  by gaseous cooling medium circulating wholly within the machine casing (H02K9/10 takes precedence) · CPC title

• F16C2380/26

  Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators · CPC title

• Y10T29/49009

  Dynamoelectric machine · CPC title