Rotary Electric Machine

Patent metadata

Field	Value
Publication number	US-2019199162-A1
Application number	US-201816180615-A
Country	US
Kind code	A1
Filing date	Nov 5, 2018
Priority date	Dec 26, 2017
Publication date	Jun 27, 2019
Grant date	—

Abstract

A rotary electric machine of the present invention includes: a stator; a rotor placed on an inner diameter side of the stator through an air gap and fixed to a rotating shaft; a stator frame supporting the stator; a casing storing the stator and the rotor; an outer fan fixed to the rotating shaft; a heat exchanger installed above the casing for heat exchange between outside air taken through the outer fan and internal air to remove heat; and an outer fan duct installed on an end portion of the casing in an axial direction, provided with the outer fan in an inside of the outer fan duct, and formed with a ventilation path through which the outside air is delivered to the heat exchanger. A plate-shaped member has at least a curved surface portion. The plate-shaped member forms the ventilation path of the outer fan duct.

First claim

What is claimed is:

1 . A rotary electric machine comprising:
a stator; a rotor placed on an inner diameter side of the stator through an air gap, the rotor being fixed to a rotating shaft; a stator frame configured to support the stator; a casing configured to store the stator and the rotor; an outer fan fixed to the rotating shaft; a heat exchanger installed above the casing, the heat exchanger being configured to exchange heat between outside air taken from an outside through the outer fan and internal air having cooled the stator and the rotor to remove heat; and an outer fan duct installed on an end portion of the casing in an axial direction, the outer fan duct being provided with the outer fan in an inside of the outer fan duct, the outer fan duct being formed with a ventilation path through which the outside air is delivered to the heat exchanger, wherein a plate-shaped member has at least a curved surface portion at which the outside air is introduced into the heat exchanger, and the plate-shaped member forms the ventilation path of the outer fan duct.

2 . The rotary electric machine according to claim 1 ,
wherein an outside air introduction guide plate is installed in an inside of the ventilation path at a position near the heat exchanger, the outside air introduction guide plate being configured to guide the introduced outside air, and the outside air introduction guide plate has a curved surface portion at which the outside air is introduced into the heat exchanger.

3 . The rotary electric machine according to claim 2 ,
wherein the ventilation path of the outer fan duct is formed of
a first ventilation path located on a far side from the heat exchanger and
a second ventilation path located on a near side to the heat exchanger, the second ventilation path communicating with the first ventilation path;
the first ventilation path is partitioned from the second ventilation path by an intermediate plate having an opening; and the second ventilation path has a curved surface portion at which the outside air is introduced into the heat exchanger.

4 . The rotary electric machine according to claim 3 ,
wherein the outside air introduction guide plate is installed in an inside of the second ventilation path.

5 . The rotary electric machine according to claim 4 ,
wherein the first ventilation path is formed of:
a first outer fan duct outer plate;
the intermediate plate;
a side plate placed on a side surface between the first outer fan duct outer plate and the intermediate plate;
an upper plate placed on an upper part of the first outer fan duct outer plate, the intermediate plate, and the side plate; and
a lower plate placed on a lower part of the first outer fan duct outer plate, the intermediate plate, and the side plate,
the second ventilation path is formed of:
a second outer fan duct outer plate;
the intermediate plate;
a side plate placed on a side surface between the second outer fan duct outer plate and the intermediate plate;
the upper plate placed on an upper part of the second outer fan duct outer plate, the intermediate plate, and the side plate; and
the lower plate placed on a lower part of the second outer fan duct outer plate, the intermediate plate, and the side plate;
the intermediate plate and the second outer fan duct outer plate have a curved surface portion at which the outside air is introduced into the heat exchanger, and the first outer fan duct outer plate is formed with an outside air intake into which the outside air is taken.

6 . The rotary electric machine according to claim 5 ,
wherein the outside air intake is formed on the upper part of the first outer fan duct outer plate, the second ventilation path communicates with the first ventilation path through the opening of the intermediate plate, and the outside air is guided from the second ventilation path to the heat exchanger.

7 . The rotary electric machine according to claim 6 ,
wherein on the first ventilation path, a plate-shaped beam is installed on a space formed by the first outer fan duct outer plate, the intermediate plate, the upper plate, and the side plate, the plate-shaped beam is formed with a ventilation hole, and the outside air flows in an inside of the first ventilation path through the ventilation hole.

8 . The rotary electric machine according to claim 7 ,
wherein on the side plate located between the first outer fan duct outer plate and the intermediate plate and the side plate located between the second outer fan duct outer plate and the intermediate plate, a beam is installed, and the beam includes a plurality of beams installed at regular intervals from a height near a lower end of the plate-shaped beam to downward.

9 . The rotary electric machine according to claim 8 ,
wherein the first outer fan duct outer plate is joined to the intermediate plate and the second outer fan duct outer plate is joined to the intermediate plate using a pipe-shaped beam or a columnar beam.

10 . The rotary electric machine according to claim 9 ,
wherein the rotating shaft extends penetrating a wall at end portion of the casing on the outer fan duct side and the second outer fan duct outer plate of the outer fan duct, the outer fan is connected to a tip end of the rotating shaft, and the outer fan is placed in the inside of the second ventilation path.

11 . The rotary electric machine according to claim 2 ,
wherein the ventilation path is formed of:
a first outer fan duct outer plate located on a far side from the heat exchanger;
a second outer fan duct outer plate located on a near side to the heat exchanger;
a side plate placed on a side surface between the first outer fan duct outer plate and the second outer fan duct outer plate;
a lower plate placed on a lower part of the first outer fan duct outer plate, the second outer fan duct outer plate, and the side plate, and
the first outer fan duct outer plate and the second outer fan duct outer plate have a curved surface portion at which the outside air is introduced into the heat exchanger.

12 . The rotary electric machine according to claim 11 ,
wherein the first outer fan duct outer plate is formed with an outside air intake into which the outside air is taken, and the outside air intake is covered with an outside air intake net.

13 . The rotary electric machine according to claim 12 ,
wherein on the ventilation path, a plate-shaped beam is installed on a space formed by the first outer fan duct outer plate, the second outer fan duct outer plate, and the side plate, the plate-shaped beam is formed with a ventilation hole, and the outside air flows in the inside of the ventilation path through the ventilation hole.

14 . The rotary electric machine according to claim 13 ,
wherein on the side plate located between the first outer fan duct outer plate and the second outer fan duct outer plate, a beam is installed, and the beam includes a plurality of beams installed at regular intervals from a height near a lower end of the plate-shaped beam.

15 . The rotary electric machine according to claim 14 ,
wherein the first outer fan duct outer plate is joined to the second outer fan duct outer plate using a pipe-shaped beam or a columnar beam.

Assignees

• Hitachi Ltd

Inventors

• Sato Misato
• Mori Takeshi
• Sugimoto Kenichi
• Koyama Takayuki

Classifications

• H02K2205/09

  Machines characterised by drain passages or by venting, breathing or pressure compensating means · CPC title

• H02K9/06

  with fans or impellers driven by the machine shaft · CPC title

• H02K9/18

  wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing · CPC title

• H02K5/24 Primary

  specially adapted for suppression or reduction of noise or vibrations · CPC title

• H02K5/20

  with channels or ducts for flow of cooling medium · CPC title