Reduction of core-end losses of dynamoelectric machines by using lower core loss iron silicon punching

• US 7,265,473 B2
• Filed: 08/28/2003
• Issued: 09/04/2007
• Est. Priority Date: 08/28/2003
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Shah, Manoj Ramprasad, Breznak, Jeffrey Michael, Salem, Sameh R., Marte, Judson Sloan, Walthers, Russell Earle
• Primary Examiner(s): Le; Dang
• Assistant Examiner(s): NGUYEN, HANH N
• Application Number:
  US10/649,784
• Publication Number:
  US 20050046300A1
• Time in Patent Office: 1,468 Days
• Field of Search: 310/254, 310/217, 310/216, 295/96
• US Class Current: 310/216.006
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: H02K 15/0006 Disassembling, repairing or modifying dynamo-electric machines repairing of cooling fluid boxes H02K15/0093
• CPC Class Codes: Y02P 80/30 Reducing waste in manufacturing processes; Calculations of released waste quantities
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

Electric machines can be improved or uprated to reduce core-end losses using lower core loss material such as high grade iron silicon. A machine uprating entails removing at least a last one of the stacked lamination packages at each end of the stator core, and re-stacking the removed lamination packages with the lower core loss material.

Claims

1. A method of uprating electric machines including a stator core with stacked lamination packages, the method comprising:

removing at least a last one of the stacked lamination packages at each end of the stator core; and

re-stacking the removed lamination packages with a lower core loss material.

2. A method according to claim 1, wherein the stacked lamination packages comprise grain-oriented iron silicon punching (M-6) having a with-grain core loss of about 0.573 at 1.5 T (W/lb), and wherein the re-stacking step comprises re-stacking the removed lamination packages with a higher grade grain-oriented iron silicon punching having a with-grain core loss less than M-6.

3. A method according to claim 1, wherein the re-stacking step comprises re-stacking the removed lamination packages with M-4 iron silicon punching.

4. An uprated electric machine assembled according to the method of claim 1.