Universal sensor probe with adjustable members configured to fit between a plurality of slot openings of varying widths

• US 7,466,126 B2
• Filed: 07/12/2004
• Issued: 12/16/2008
• Est. Priority Date: 07/12/2004
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Shah, Manoj Ramprasad, Carl, Ralph James Jr., Lee, Sang-Bin
• Primary Examiner(s): Patidar; Jay M
• Application Number:
  US10/889,619
• Publication Number:
  US 20060006848A1
• Time in Patent Office: 1,618 Days
• Field of Search: 324/207.15-207.17,219,228,234,236-241,529,772 318/490
• US Class Current: 324/219
• CPC Class Codes: G01R 31/346 Testing of armature or field windings
• CPC Class Codes: H02K 11/20 for measuring, monitoring, testing, protecting or switching rectifiers H02K11/04; power electronics H02K11/33

Abstract

An aspect of the invention is directed to a variable sensor head for use in multiple electric machines with varying slot openings comprising a ferromagnetic core; a first adjustable portion and a second adjustable portion positioned in communication with the ferromagnetic core wherein the first adjustable portion and the second adjustable portion are adjusted to fit between a plurality of slot openings of varying widths between a pair of lamination teeth of an electric machine. According to another embodiment, the first and second adjustable portions are sliding portions where the sliding portions may be spring biased to provide a close fit between the pair of lamination teeth. According to another embodiment, the first and second adjustable portions are adjustable screws. According to another embodiment, the first adjustable portion is a plurality of nested steel sheets providing a spring biased tension and the second adjustable portion is in communication with the plurality of nested steel sheets for contacting one of the pair of lamination teeth. According to another embodiment, a ferromagnetic core comprises an adjustable portion including a plurality of corrugated laminations creating a plurality of nested wavy springs.

Claims

1. A variable sensor head for use in multiple electric machines with varying slot openings, the variable sensor head comprising:

a ferromagnetic core; and

a first adjustable portion and a second adjustable portion positioned in communication with the ferromagnetic core wherein the first adjustable portion and the second adjustable portion are adjusted to fit between a plurality of slot openings of varying widths between a pair of teeth of an electric machine.

2. The variable sensor head of claim 1, wherein the first and second adjustable portions are sliding portions.

3. The variable sensor head of claim 2, wherein the sliding portions are spring biased to provide a close fit between the pair of teeth which are lamination teeth.

4. The variable sensor head of claim 3, wherein a surface of each of the sliding portions in contact with the pair of lamination teeth are coated with a slippery plastic material.

5. The variable sensor head of claim 3, wherein a surface of each of the sliding portions in contact with the pair of lamination teeth are coated with one or more of iron powder and ferromagnetic fluid to reduce an effective air gap.

6. The variable sensor head of claim 1, wherein the first and second adjustable portions are adjustable screws and the pair of teeth are lamination teeth.

7. The variable sensor head of claim 6, wherein a surface of each of the adjustable screws in contact with the pair of lamination teeth are coated with a slippery plastic material.

8. The variable sensor head of claim 6, wherein a surface of each of the adjustable screws in contact with the pair of lamination teeth are coated with iron powder to reduce an effective air gap.

9. The variable sensor head of claim 6, wherein a surface of each of the adjustable screws in contact with the pair of lamination teeth are coated with a ferromagnetic fluid to reduce an effective air gap.

10. The variable sensor head of claim 1, wherein the first and second adjustable portions are made of magnetic material.

11. The variable sensor head of claim 10, wherein the magnetic material comprises one or more of laminations and soft magnetic composite.

12. The variable sensor head of claim 1, wherein the first adjustable portion is a plurality of nested steel sheets providing a spring biased tension.

13. The variable sensor head of claim 12, wherein the second adjustable portion is in communication with the plurality of nested steel sheets for contacting one of the pair of teeth, wherein the pair of teeth are lamination teeth.

14. The variable sensor head of claim 1, wherein the core, first adjustable portion and the second adjustable portion comprise a magnetic material for effective flux transfer.

15. A variable sensor head for use in multiple electric machines with varying slot openings, the variable sensor head comprising:

a ferromagnetic core; and

an adjustable portion positioned in communication with the ferromagnetic core wherein the adjustable portion is adjusted to fit between a plurality of slot openings of varying widths between a pair of teeth of an electric machine.

16. A variable sensor head for use in multiple electric machines with varying slot openings, the variable sensor head comprising:

a ferromagnetic core comprising an adjustable portion wherein the adjustable portion is adjusted to fit between a plurality of slot openings of varying widths between a pair of teeth of an electric machine; and

a coil surrounding the ferromagnetic core.

17. The variable sensor head of claim 16, wherein the adjustable portion comprises a plurality of corrugated laminations creating a plurality of nested steel sheet bellows.

18. The variable sensor head of claim 17, wherein the plurality of corrugated laminations comprise a ferromagnetic material.

19. The variable sensor head of claim 17, wherein the plurality of nested steel sheet bellows are spring biased.