Dynamoelectric machine stator test device

• US 5,341,095 A
• Filed: 01/27/1993
• Issued: 08/23/1994
• Est. Priority Date: 01/27/1993
• Status: Expired due to Term

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Marfin, Alan A., Dailey, George F., Shelton, James W.
• Primary Examiner(s): Karlsen, Ernest F.
• Application Number:
  US08/010,091
• Time in Patent Office: 573 Days
• Field of Search: 324/158 MG, 324/545, 324/546, 340/648, 322/99, 104/283, 104/284
• US Class Current: 324/765.01
• CPC Class Codes: G01R 31/34 Testing dynamo-electric machines

Abstract

A stator testing device for a dynamoelectric machine formed from a plurality of laminations defining a plurality of substantially parallel stator teeth each extending over a preselected length of the stator. The stator testing device includes a housing having a bottom face adapted to be disposed adjacent the stator teeth and a face cover extending outwardly from said bottom face. A chattock coil for detecting stator axial currents is disposed within said housing. The chattock coil has a pair of end portions with bottom surfaces each extending to the bottom face of said housing. A pair of brackets are removably attached to the face cover of said housing, and a magnet is removably attached to each bracket. The magnets are located on the brackets so that the bottom surfaces of the pair of magnets are positioned adjacent to selected corners of adjacent stator teeth and remain in positional relationship to the selected corners as the housing is moved over a preselected length of said stator.

Claims

1. A hand-held testing device for a dynamoelectric machine stator formed from a plurality of laminations configured to define a plurality of substantially parallel teeth each having a pair of corner portions, an outer surface between the corner portions and extending over a preselected length of the stator, the testing device comprising:

(a) a housing having a bottom face adapted to be disposed adjacent the stator teeth and a face cover extending outwardly from said bottom face;

(b) coil means for detecting stator axial currents and disposed within said housing, said coil means having a pair of end portions with bottom surfaces each extending to said bottom face of said housing;

(c) bracket means removably attached to said face cover of said housing; and

(d) a pair of magnets each having a bottom surface, each of said pair of magnets being removably attached to said bracket means and located on said bracket means so that said bottom surfaces of said pair of magnets are positioned adjacent to selected corners of adjacent teeth and remain in adjacent positional relationship by magnetic attraction to said selected corners as said housing is moved over a preselected length of said stator.

2. The apparatus as in claim 1 wherein said bracket means includes a pair of brackets movably attached to said face cover so that said pair of brackets may be spaced a preselected distance apart and so that each of said brackets may be positioned at a preselected angle relative to said bottom face.

3. The apparatus as in claim 2 wherein said bracket means is attached to said housing by non-metallic attachment means.

4. The apparatus as in claim 3 wherein the magnet means are positioned at least one and one half inches from a centerline extending through the end portions of said coil means.

5. The apparatus as in claim 4 wherein said bracket means has a L-shaped configuration.

6. The apparatus as in claim 5 wherein said bracket means has an arcuate shaped surface adapted to be disposed adjacent the stator to conform generally to the shape of the stator.

7. The apparatus as in claim 6 wherein the face cover of said housing includes a plurality of slots for receiving the attachment means and permitting the attachment means and the pair of brackets to be positioned at a preselected location on said face cover.

8. The apparatus as in claim 7 wherein said bracket means has a side support attached to said L-shaped bracket for strengthening said bracket means.

9. The apparatus as in claim 8 wherein said magnet means are high strength neodymium magnets.

10. The apparatus as in claim 1 wherein said bracket means includes a wheel attached to said bracket for permitting said housing to slidably move along the stator.

11. A hand held testing device for a dynamoelectric machine stator formed from a plurality of laminations configured to define a plurality of substantially parallel teeth each having a pair of corner portions, an outer surface between said corner portions and extending over a preselected length of the stator, the testing device comprising:

(a) a housing having two face covers, two side faces and a top arranged to form a box-like housing;

(b) coil means for detecting axial currents and disposed within said housing, said coil means having two end portions each terminating at a bottom face of said housing disposed between the two face covers;

(c) at least two L-shaped brackets secured to, each of said face covers; and

(d) a pair of magnets each having a bottom surface, each of said pair of magnets being removably attached to one of said brackets and located on said bracket so that said bottom surfaces of said pair of magnets are positioned adjacent to selected corners of adjacent teeth and remain in positional relationship by magnetic attraction to said selected corners as said housing is moved over a preselected length of said stator.

12. The apparatus as in claim 11 wherein each of said magnets is a high strength neodymium magnet.

13. The apparatus as in claim 11 wherein, each of said magnets is a neodymium boron magnet.

14. The apparatus as in claim 11 wherein said pair of magnets function to maintain the positional relationship between said housing and the stator when said housing is positioned on the stator.