Rotary electric machine including rectifying parts and intake parts

Patent metadata

Field	Value
Publication number	US-10874014-B2
Application number	US-201515560521-A
Country	US
Kind code	B2
Filing date	Apr 28, 2015
Priority date	Apr 28, 2015
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A cover covering a rectifying device includes a cover end wall portion, a cover outer wall portion, and a cover intermediate portion interposed between the cover end wall portion and the cover outer wall portion. The cover end wall portion includes an inner peripheral side intake portion, and the cover intermediate portion includes an outer peripheral side intake portion. The outer peripheral side intake portion includes an axial direction covering portion existing in a position that is closer to a rotary electric machine main body than the cover end wall portion in an axial direction, and a radial direction covering portion that connects the axial direction covering portion to an outer peripheral portion of the cover end wall portion. Intake holes are provided respectively in the inner peripheral side intake portion, the axial direction covering portion, and the radial direction covering portion.

First claim

The invention claimed is:

1. A rotary electric machine comprising:
a rotary electric machine main body having a stator, a rotor that rotates relative to the stator about an axis, a fan provided on an axial direction end portion of the rotor, and a frame that supports the stator and the rotor;
a rectifying device attached to the frame about the axis, and disposed on an axial direction outer side of the rotary electric machine main body; and
a cover covering the rectifying device,
wherein the cover includes a cover end wall portion positioned on the axial direction outer side of the rectifying device, a cover outer wall portion positioned on a radial direction outer side of the rectifying device, and a cover intermediate portion interposed between the cover end wall portion and the cover outer wall portion,
the cover end wall portion includes an inner peripheral side intake portion,
the cover intermediate portion includes an outer peripheral side intake portion,
the outer peripheral side intake portion includes an axial direction covering portion existing in a position that is closer to the rotary electric machine main body than the cover end wall portion in an axial direction and facing an axial direction, and a radial direction covering portion that connects the axial direction covering portion to an outer peripheral portion of the cover end wall portion and facing a radial direction,
intake holes are provided respectively in the inner peripheral side intake portion, the axial direction covering portion, and the radial direction covering portion, wherein at least one intake hole provided in the axial direction covering portion faces the axial direction and at least one intake hole provided in the radial direction covering portion faces the radial direction, and
a total surface area of the intake holes provided in the respective outer peripheral side intake portions is larger than a total surface area of the intake holes provided in the inner peripheral side intake portion.

2. The rotary electric machine according to claim 1 , wherein the cover outer wall portion includes an outer wall extension portion that projects further toward the cover end wall portion side than the axial direction covering portion in the axial direction.

3. The rotary electric machine according to claim 1 , wherein
the rectifying device includes a first rectifying unit, a second rectifying unit disposed between the first rectifying unit and the rotary electric machine main body in the axial direction, and a circuit board disposed between the first rectifying unit and the second rectifying unit in order to couple the first and second rectifying units to each other,
the first rectifying unit includes a first heat sink and a first rectifying element provided on the first heat sink,
the second rectifying unit includes a second heat sink and a second rectifying element provided on the second heat sink,
the second heat sink includes a plurality of second outer side fins disposed so as to extend in the axial direction,
the plurality of second outer side fins are disposed so as to deviate further toward the radial direction outer side than respective regions of the first rectifying unit and the circuit board when seen in the axial direction, and
the axial direction covering portion opposes the plurality of second outer side fins in the axial direction.

4. The rotary electric machine according to claim 3 , wherein
the first heat sink includes a first heat sink main body on which the first rectifying element is provided, and a plurality of first inner side fins disposed so as to project from the first heat sink main body and extend in the axial direction on a radial direction inner side of the first heat sink main body, and
the inner peripheral side intake portion opposes the plurality of first inner side fins in the axial direction.

5. The rotary electric machine according to claim 3 , wherein
the second heat sink includes a second heat sink main body on which the second rectifying element is provided, and a plurality of second inner side fins disposed so as to project from the second heat sink main body and extend in the axial direction on a radial direction inner side of the second heat sink main body, and
the plurality of second outer side fins project from the second heat sink main body, and are disposed on the radial direction outer side of the second heat sink main body.

6. The rotary electric machine according to claim 3 , wherein gaps exist respectively between the first rectifying unit, the second rectifying unit, and the circuit board.

7. The rotary electric machine according to claim 1 , wherein the intake holes are partitioned by a lattice in at least one of the axial direction covering portion and the radial direction covering portion.

8. A rotary electric machine comprising:
a rotary electric machine main body having a stator, a rotor that rotates relative to the stator about an axis, a fan provided on an axial direction end portion of the rotor, and a frame that supports the stator and the rotor;
a rectifying device attached to the frame about the axis, and disposed on an axial direction outer side of the rotary electric machine main body; and
a cover covering the rectifying device,
wherein the cover includes a cover end wall portion positioned on the axial direction outer side of the rectifying device, a cover outer wall portion positioned on a radial direction outer side of the rectifying device, and a cover intermediate portion interposed between the cover end wall portion and the cover outer wall portion,
the cover end wall portion includes an inner peripheral side intake portion,
the cover intermediate portion includes an outer peripheral side intake portion,
the outer peripheral side intake portion includes an axial direction covering portion existing in a position that is closer to the rotary electric machine main body than the cover end wall portion in an axial direction and facing an axial direction, and a radial direction covering portion that connects the axial direction covering portion to an outer peripheral portion of the cover end wall portion and facing a radial direction, and
a plurality of intake holes are provided respectively in the inner peripheral side intake portion, the axial direction covering portion, and the radial direction covering portion, wherein at least one intake hole provided in the axial direction covering portion faces the axial direction and at least one intake hole provided in the radial direction covering portion faces the radial direction,
the intake holes are partitioned by a lattice in at least one of the axial direction covering portion and the radial direction covering portion.

Assignees

• Mitsubishi Electric Corp

Inventors

• Akiyoshi Masao
• Kobayashi Yuzuru
• Honsho Kentaro

Classifications

• H02K11/05

  Rectifiers associated with casings, enclosures or brackets · CPC title

• H02K5/207

  with openings in the casing specially adapted for ambient air · CPC title

• H05K1/0201 Primary

  Thermal arrangements, e.g. for cooling, heating or preventing overheating · CPC title

• H02K19/365

  with a voltage regulator · CPC title

• H02K5/04

  Casings or enclosures characterised by the shape, form or construction thereof · CPC title