Cantilever stator

Patent metadata

Field	Value
Publication number	US-2016156245-A1
Application number	US-201414557224-A
Country	US
Kind code	A1
Filing date	Dec 1, 2014
Priority date	Dec 1, 2014
Publication date	Jun 2, 2016
Grant date	—

Abstract

An electric motor includes: a housing having a first rotor bearing and a stator support surface; a cantilever stator that includes a lamination stack, a first side of the lamination stack abutting the stator support surface and a second side of the lamination stack abutting a stator endbell that has a second rotor bearing, wherein the cantilever stator is held by way of tie rods attaching the stator endbell to the housing; and a rotor in the cantilever stator, the rotor held by the first and second rotor bearings.

First claim

What is claimed is:

1 . An electric motor comprising:
a housing having a first rotor bearing and a stator support surface; a cantilever stator that includes a lamination stack, a first side of the lamination stack abutting the stator support surface and a second side of the lamination stack abutting a stator endbell that has a second rotor bearing, wherein the cantilever stator is held by way of tie rods attaching the stator endbell to the housing; and a rotor in the cantilever stator, the rotor held by the first and second rotor bearings.

2 . The electric motor of claim 1 , wherein the cantilever stator is positioned by at least one pin, a first end of the pin extending into one of the first and second sides of the lamination stack, and a second end of the pin extending into a corresponding one of the stator support surface and the stator endbell.

3 . The electric motor of claim 2 , wherein the first end of the pin extends into a hole that is stamped into at least an outer lamination of the lamination stack.

4 . The electric motor of claim 2 , wherein the cantilever stator is positioned by multiple pins at each of the first and second sides of the lamination stack.

5 . The electric motor of claim 1 , wherein the tie rods are positioned evenly around a circumference of the stator endbell.

6 . The electric motor of claim 1 , wherein the tie rods pass through openings in the stator endbell, extend along an outer surface of the cantilever stator, and are attached to the housing at the stator support surface.

7 . The electric motor of claim 1 , wherein the housing and the stator endbell are cast pieces.

8 . The electric motor of claim 1 , further comprising a bucket that covers the stator endbell, tie rods and cantilever stator, the bucket attached to the housing.

9 . The electric motor of claim 8 , further comprising reinforcement struts on the bucket.

10 . The electric motor of claim 9 , wherein the bucket is essentially cylindrical, and wherein the reinforcement struts comprise at least a first pair of crossing reinforcement struts on a bottom or a side surface of the bucket.

11 . The electric motor of claim 10 , wherein the reinforcement struts further comprise at least a second pair of crossing reinforcement struts on another of the bottom or the side surface of the bucket.

12 . The electric motor of claim 8 , wherein the bucket is configured to react torque generated by the electric motor.

13 . An electric motor comprising:
a housing having a stator support surface; a cantilever stator; means for holding the cantilever stator onto the stator support surface; and a rotor in the cantilever stator.

14 . A method of assembling an electric motor, the method comprising:
positioning a cantilever stator and a housing relative each other so that a first side of a lamination stack of the cantilever stator abuts a stator support surface on the housing; placing a rotor within the cantilever stator so that the rotor is held by at least a first rotor bearing in the housing; placing a stator endbell against a second side of the lamination stack, the rotor being held by at least a second rotor bearing on the stator endbell; and attaching the stator endbell to the housing using tie rods, thereby holding the cantilever stator.

15 . The method of claim 14 , further comprising positioning the cantilever stator relative to the housing using at least one pin.

16 . The method of claim 14 , wherein attaching the stator endbell to the housing comprises passing the tie rods through openings in the stator endbell so that the tie rods extend along an outer surface of the cantilever stator, and attaching the tie rods to the housing at the stator support surface.

Assignees

• Tesla Motors Inc

Inventors

• Pearce Jr Edwin M
• Robbins Jim
• Heines Scott
• Nelson David F
• Pinkley Gary A
• Balsamo Michael
• Barton Augusto E

Classifications

• H02K5/00

  Casings; Enclosures; Supports · CPC title

• H02K5/15 Primary

  Mounting arrangements for bearing-shields or end plates · CPC title

• H02K15/14

  Casings; Enclosures; Supports · CPC title

• H02K5/203

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