Rotor assembly for an electric machine

Patent metadata

Field	Value
Publication number	US-2016352174-A1
Application number	US-201315027464-A
Country	US
Kind code	A1
Filing date	Nov 4, 2013
Priority date	Sep 6, 2013
Publication date	Dec 1, 2016
Grant date	—

Abstract

A rotor assembly for an electric machine includes a core and a cap wherein electrical windings are wound about the rotor assembly to define a pole. The rotation of the rotor and rotor pole relative to a stator generates a current supplied from the electric machine to a power consuming device.

First claim

What is claimed is:

1 . A rotor assembly for an electric machine comprising:
a core having at least one post about which a winding may be wound to define a pole for the electric machine, with the at least one post at least partially defining a winding seat; a cap overlying the post and the winding seat to collectively define an axial extending winding slot with the core; and an interlock removably coupling the cap and the post.

2 . The rotor assembly of claim 1 wherein the interlock comprises a projection on one of the cap and the post and a recess on the other of the cap and the post, wherein the projection is received within the recess to removably couple the cap to the post.

3 . The rotor assembly of claim 2 wherein the projection and the recess have complementary cross sections.

4 . The rotor assembly of claim 3 wherein the complementary cross sections are at least one of: at least partially circular or at least partially trapezoidal.

5 . The rotor assembly of claim 2 wherein the interlock further comprises at least one corner finger extending from one of the cap and the post and abutting a corner of the other of the cap and the post.

6 . The rotor assembly of claim 5 wherein the corner finger is spaced from the projection.

7 . The rotor assembly of claim 6 wherein there are at least two corner fingers, with at least one corner finger on each side of the projection.

8 . The rotor assembly of claim 7 wherein the projection extends from the cap, a corresponding recess is formed in the post, and the corner fingers extend from the cap and abut opposing corners on the post.

9 . The rotor assembly of claim 8 wherein the post comprises a channel along at least one corner and the corresponding finger is received within the channel.

10 . The rotor assembly of claim 1 further comprising an anti-rotation lock configured to retard the relative rotation of the cap and the post.

11 . The rotor assembly of claim 10 wherein the anti-rotation lock comprises at least one corner finger extending from one of the cap and the post and abutting a corner of the other of the cap and the post.

12 . The rotor assembly of claim 10 wherein the core comprises at least one of a solid body or a unitary body.

13 . The rotor assembly of claim 1 wherein the cap comprises a plurality of laminations and the core does not comprise a plurality of laminations.

14 . The rotor assembly of claim 1 wherein the core comprises at least one internal cooling passage adjacent at least a portion of the winding slot.

15 . The rotor assembly of claim 1 wherein the core further comprises a thermal conductor provided on the winding seat.

Assignees

• Ge Aviation Systems Llc

Inventors

• Huang Hao
• Jia Xiaochuan

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

• H02K19/38 Primary

  Structural association of synchronous generators with exciting machines · CPC title

• H02K1/28

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title

• H02K3/52 Primary

  Fastening salient pole windings or connections thereto · CPC title

• H02K1/32

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