IP Library › Granted Patent US 7,051,421
Granted Patent B2
US 7,051,421 · App. 10/431,744 · Granted May 30, 2006

Method of fabricating a rotor

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Quick Facts
Patent No.
US 7,051,421
App. No.
10/431,744
Granted
May 30, 2006
Kind
B2
Abstract

An electric traction motor for a vehicle including a housing, a wound stator field located in the housing, a rotor magnetically interacting with the wound stator field, high energy magnets configured in the rotor, and low energy magnets configured in the rotor.

Claims (15)

1. A method of fabricating a rotor for an electric traction motor comprising the steps of:

forming cavities in the rotor;

injecting high energy magnetic material in a portion of the cavities;

injecting low energy magnetic material in a portion of the cavities; and

post-magnetizing the magnetic material using a wound stator of the electric traction motor.

2. The method of claim 1 further comprising the step of bonding said high energy and low energy magnetic material with a plastic.

3. A method of fabricating an electric traction motor comprising:

providing a stator for the electric traction motor;

providing a rotor for the electric traction motor;

forming cavities in the rotor;

injecting high energy magnetic material in a portion of the cavities;

injecting low energy magnetic material in a portion of the cavities; and

postmagnetizing the magnetic material with the stator.

4. The method of claim 3 further comprising bonding said high energy and low energy magnetic material with a plastic.

5. The method of claim 3 further comprising energizing said high energy magnets with a magnetizing field of more than 2000 kA/m.

Assignments (12)
RELEASE OF SECURITY INTEREST Recorded Nov 7, 2014
From: WILMINGTON TRUST COMPANY
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 034183/0680 →
CHANGE OF NAME Recorded Feb 10, 2011
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 025780/0902 →
SECURITY AGREEMENT Recorded Nov 8, 2010
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: WILMINGTON TRUST COMPANY
Reel/Frame 025327/0262 →
RELEASE OF SECURITY INTEREST Recorded Nov 4, 2010
From: UNITED STATES DEPARTMENT OF THE TREASURY
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 025245/0347 →
RELEASE OF SECURITY INTEREST Recorded Nov 4, 2010
From: UAW RETIREE MEDICAL BENEFITS TRUST
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 025311/0725 →
SECURITY AGREEMENT Recorded Aug 28, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UAW RETIREE MEDICAL BENEFITS TRUST
Reel/Frame 023161/0911 →
SECURITY AGREEMENT Recorded Aug 27, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UNITED STATES DEPARTMENT OF THE TREASURY
Reel/Frame 023156/0001 →
RELEASE OF SECURITY INTEREST Recorded Aug 21, 2009
From: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES; CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 023127/0273 →
RELEASE OF SECURITY INTEREST Recorded Aug 20, 2009
From: UNITED STATES DEPARTMENT OF THE TREASURY
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 023124/0470 →
SECURITY AGREEMENT Recorded Apr 16, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES; CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
Reel/Frame 022553/0399 →
SECURITY AGREEMENT Recorded Feb 4, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UNITED STATES DEPARTMENT OF THE TREASURY
Reel/Frame 022201/0547 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 13, 2009
From: GENERAL MOTORS CORPORATION
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 022092/0703 →