Electric machine with rotor cooling and corresponding cooling method

• US 20070024130A1
• Filed: 07/23/2004
• Published: 02/01/2007
• Est. Priority Date: 08/01/2003
• Status: Active Grant

• Current Assignee: Innomotics GmbH (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Schmidt, Valerias
• Granted Patent: US 7,646,119 B2
• Time in Patent Office: Days
• US Class Current: 310/61
• CPC Class Codes: H02K 1/265 Shape, form or location of the slots
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 15/024 with slots
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft

Abstract

The aim of the invention is to optimize cooling of a rotor using simple means. A rotor is provided, comprising rotor pressure rings (1) such that at least one of the two rotor pressure rings (1) is configured in order to enable targeted guiding of the coolant through the axial bores (3, 3′) in the rotor. In a special embodiment, the rotor pressure ring (1) can be formed in such a manner that it produces, in several bores (3′) in the rotor sheet stack (8), a flow of coolant in a first direction and in other bores (3), a flow of coolant in the other direction. An even, opposite flow cooling can be exclusively obtained by the contour of the rotor pressure ring (1).

Claims

1. A rotor device, with

a laminated core arrangement (8), which has a plurality of axial bores (3, 3′

) for the conduction of a coolant, and

two rotor pressure rings (1, 101), between which the laminated core arrangement (8) is fixed axially,

wherein

at least one of the two rotor pressure rings (1, 101) is configured for the targeted routing of coolant through the axial bores (3, 3′

),

characterized in that

a plurality of coolant routing walls (5) project obliquely outward on the at least one rotary pressure ring (1, 101), so that they conceal in each case one or more of the bores (3, 3′

) in the axial direction.

2. The rotor device as claimed in claim 1, wherein the axial bores (3, 3′

) is combined into a plurality of groups by means of at least one of the rotor pressure rings (1, 101), so that the coolant stream through the bores (3, 3′

) of a group is essentially identical.

3. The rotor device as claimed in claim 2, wherein in each case two, three or four bores (3, 3′

) are combined in a group.

4. The rotor device as claimed in one of the preceding claims, wherein the bores (3, 3′

) or groups of bores (3, 3′

) are coolable contradirectionally with respect to one another.

5. The rotor device as claimed in one of the preceding claims, wherein radii for improving the coolant flow are formed or cast on at predetermined edges of the at least one rotor pressure ring (1, 101).

6. The rotor device as claimed in one of the preceding claims, wherein the at least one rotor pressure ring (1) is configured as a fan.

7. The rotor device as claimed in claim 6, wherein the at least one rotor pressure ring (1, 101) is produced in one piece.

8. The rotor device as claimed in one of the preceding claims, wherein the at least one rotor pressure ring (1, 101) is manufactured from spheroidal graphite iron.

9. The rotor device as claimed in one of the preceding claims, wherein the two rotor pressure rings (1) possess a similar construction and are arranged on a common axis about a bore or a group of bores (3, 3′

) so as to be offset in the circumferential direction.

15. An electric machine having a rotor device as claimed in one of claims 1 to 9.

10-14. -14. (canceled)