Electric machine

Patent metadata

Field	Value
Publication number	US-9831745-B2
Application number	US-201314135977-A
Country	US
Kind code	B2
Filing date	Dec 20, 2013
Priority date	Dec 21, 2012
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

An electric machine is supplied with air for cooling purposes. The electric machine has a housing ( 40 ) with cooling ducts for cooling air. To improve and/or simplify the cooling of the electric machine, air-distributing ducts ( 71 ) are formed in the housing ( 40 ) and emerge from a common air supply duct ( 70 ).

First claim

What is claimed is:

1. An electric machine, comprising: a housing, a rotor and a stator disposed in the housing, with the rotor being rotatable relative to the stator around a rotational axis that extends in an axial direction, an air supply duct extending in a circumferential direction in the housing at a position radially outward from both the rotor and the stator, air-distributing ducts formed in the housing and emerging from the air supply duct, the air-distributing ducts extending in the axial direction and being at positions radially outward from both the rotor and the stator, air distributing pockets extending radially in from positions on the air-distributing ducts spaced from the air supply duct, the air-distributing pockets communicating with an axial end of the rotor, and air-removing ducts extending out from the housing at an axial end of the housing spaced from the air-distributing pockets.

2. The electric machine of claim 1 , wherein the air-distributing pockets are recessed in an inner base surface of the housing.

3. The electric machine of claim 1 , wherein a first axial rotor end surface faces the air-distributing pockets.

4. The electric machine of claim 3 , wherein a second axial rotor end surface is connected to a fan wheel for conjoint rotation.

5. The electric machine of claim 4 , wherein the air-removing ducts are arranged in a region of the fan wheel.

6. The electric machine of claim 5 , wherein the air-removing ducts extend radially outward.

7. A motor vehicle with the electric machine of claim 1 .

8. The motor vehicle of claim 7 further comprising a bodywork part with an air inlet opening aligned to face a travel direction of the motor vehicle, at least one cooling air connection providing communication between the air inlet opening in the bodywork part and the air supply duct of the electric machine for providing a flow of cooling air to the electric machine.

9. The electric machine of claim 1 , wherein each of the air-distributing pockets have substantially equal radial dimensions.

10. An electric machine, comprising: a housing, a rotor and a stator disposed in the housing, with the rotor being rotatable relative to the stator around a rotational axis that extends in an axial direction, an air supply duct extending in a circumferential direction in the housing at a position radially outward from the rotor, air-distributing ducts formed in the housing and emerging from the air supply duct, the air-distributing ducts extending in the axial direction, air distributing pockets extending radially in from positions on the air-distributing ducts spaced from the air supply duct, the air-distributing pockets communicating with an axial end of the rotor, and air-removing ducts extending out from the housing at an axial end of the housing spaced from the air-distributing pockets, wherein the air-distributing pockets have substantially equal radial dimensions, each of the air-distributing pockets has a circumferential dimension, the circumferential dimension of at least one of the air-distributing pockets being different from the circumferential dimension of at least one other of the air-distributing pockets.

11. The electric machine of claim 1 , further comprising an air supply device communicating with the air supply duct and configured for guiding cooling air into the air supply duct.

12. The electric machine of claim 10 , wherein the air-distributing ducts are formed in the housing at positions radially outward from both the rotor and the stator.

Assignees

• Porsche Ag
• Porsche Ag

Inventors

• Schiek Werner
• Szinyi Odon

Classifications

• H02K9/197

  in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator · CPC title

• H02K5/20

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

• H02K9/02 Primary

  by ambient air flowing through the machine · CPC title

• H02K5/203

  specially adapted for liquids, e.g. cooling jackets · CPC title

• H02K5/207

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