Rotary electric machine

Patent metadata

Field	Value
Publication number	US-9419498-B2
Application number	US-201114127629-A
Country	US
Kind code	B2
Filing date	Jun 30, 2011
Priority date	Jun 30, 2011
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A rotary electric machine according to the present invention includes a stator including a stator core and stator coils, a rotor provided rotatably with a gap to the stator, a housing that stores the stator and the rotor, a fan that circulates air inside the housing through the gap in the housing, a heat exchanger that cools the air circulated by the fan, and an air guiding plate including an air guiding route formed therein for guiding the air cooled by the heat exchanger such that the cooled air flows into the gap without coming into contact with the stator coils.

First claim

The invention claimed is:

1. A rotary electric machine, comprising:
a stator including a stator core and stator coils;
a rotor provided rotatably with a gap to the stator;
a housing that stores the stator and the rotor;
a fan that circulates air inside the housing through the gap in the housing;
a heat exchanger that cools the air circulated by the fan; and
an air guiding plate including an air guiding route formed therein for guiding the air cooled by the heat exchanger such that the cooled air flows into the gap without coming into contact with the stator coils, the air guiding plate extending from an edge of the heat exchanger to an edge of the stator adjacent to the gap.

2. The rotary electric machine according to claim 1 , wherein
the housing includes a tubular body, and a front bracket and a rear bracket that each cover an end of the body and support an end of the rotating shaft, and
the heat exchanger is attached so as to be in contact with the front bracket or the rear bracket and is cooled by outside air through the front bracket or the rear bracket in contact with the heat exchanger.

3. The rotary electric machine according to claim 2 , wherein
the air guiding plate is placed at a cooled-air inlet of the gap such that an end portion of the stator coils is outside the air guiding route.

4. The rotary electric machine according to claim 3 , wherein
the air guiding plate is placed between a cooled-air outlet of the heat exchanger and an end surface of the stator core such that the end portion of the stator coils is outside the air guiding route.

5. The rotary electric machine according to claim 4 , wherein
the rotor is placed inside the stator, and
the heat exchanger is an annular body, and this annular heat exchanger is placed on the front bracket or the rear bracket concentrically with a rotating axis of the rotor, and the cooled-air outlet has an opening in an end surface, facing the stator, of the annular heat exchanger, and
the air guiding plate is formed in a funnel shape such that the cooled air flowing from the cooled-air outlet is guided by the air guiding route in a direction along the rotating axis to flow into the gap.

6. The rotary electric machine according to claim 1 , further comprising a rotating shaft connected to the rotor, wherein
the fan is mounted on the rotating shaft.

7. The rotary electric machine according to claim 6 , wherein
the fan is a forced draft fan or a centrifugal fan, either of which is mounted on one end of the rotating shaft.

8. The rotary electric machine according to claim 6 , wherein
the fan includes a first fan placed at one end of the rotating shaft and a second fan placed at another end of the rotating shaft, and one of the first and second sending fans is a forced draft fan, and another is a centrifugal fan.

9. The rotary electric machine according to claim 1 , wherein
the heat exchanger includes first and second heat exchangers each provided at an end of the rotating shaft.

10. The rotary electric machine according to claim 9 , wherein
the stator includes a plurality of stator radial ducts that extends from an axially middle portion of the gap in a radial direction through to a peripheral surface, and
the fan includes first and second forced draft fans each provided at an end of the rotating shaft.

11. The rotary electric machine according to claim 10 , wherein
the rotor includes a plurality of rotor radial ducts formed from the axially middle portion of the gap toward an inner diameter direction and a rotor axial duct that extends from both end surfaces of the rotor in a rotating shaft direction and is in communication with the rotor radial ducts.

12. The rotary electricity according to claim 9 , wherein
the stator includes a plurality of stator split cores,
the rotor includes a plurality of rotor split cores,
a stator radial duct structure is provided between two consecutive stator split cores of the plurality of stator split cores, the stator radial duct structure including a plurality of duct spaces that penetrates the stator from an axially middle portion of the gap in a radial direction,
a rotor radial duct structure is provided between two consecutive rotor split cores of the plurality of rotor split cores, the rotor radial duct structure including a plurality of duct spaces that penetrates the rotor from an axially middle portion of the rotor axial duct in the radial direction, and
the fan includes first and second forced draft fans each provided at an end of the rotating shaft.

13. The rotary electric machine according to claim 1 , wherein
the fan is provided at an outer periphery side of the stator, and is driven to rotate from an outside of the rotary electric machine.

14. The rotary electric machine according to claim 1 , wherein
the heat exchanger performs heat exchanging between a cooling medium supplied from an outside of the rotary electric machine and the air inside the housing.

15. The rotary electric machine according to claim 14 , wherein
the housing includes a tubular body, and a front bracket and a rear bracket that each cover an end of the body, and
the heat exchanger is not in contact with the front bracket or the rear bracket and is provided in proximity to the rotor.

Assignees

• Kimura Mamoru
• Komura Akiyoshi
• Hitachi Ltd

Inventors

• Kimura Mamoru
• Komura Akiyoshi

Classifications

• H02K9/08 Primary

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

• H02K9/10 Primary

  by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing · CPC title