Claims
- 1. A process for preventing film stripping and grooving of a commutator on a high-powered, high-speed dynamoelectric machine that has a plurality of sets of brush holders, each said set comprising an even number of brush holders mounted in juxtaposed pairs on an associated brush holder stud for supporting a brush of predetermined standard size in each brush holder and in sliding cooperation with the commutator, said process comprising the steps of:
- (a) removing each of said brush holders and the brushes therein from the mounting studs associated respectively therewith,
- (a-1) modifying each said pair of the standard size brush holders and securing them together to make an extra-wide brush holder thereof,
- (b) replacing each juxtaposed pair of said brush holders, respectively, with an extra-wide brush holder that is effective when mounted on its stud to support an extra-wide brush in sliding cooperation with the commutator,
- (b-1) mounting said modified and secured together, extra-wide brush holders to the respective studs with the mounting means used to originally mount standard size brush holders to the studs,
- (c) disposing an extra-wide brush, having a width substantially greater than the width of one of said standard size brushes, in operating position in each of said extra-wide brush holders, and
- (d) electrically connecting in parallel each of said extra-wide brushes in a set of brushes mounted in common on the respective studs thereby to limit current density unbalance between the brushes in each set to a range of 10 to 15% of average brush current.
- 2. A process as defined in claim 1 wherein said even number of originally provided brush holders comprises at least six, and wherein the width of each of said extra-wide brushes is about twice the width of one of said standard size brushes.
- 3. A process as defined in claim 2 wherein the width of each extra-wide brush is more than twice and less than three times the width of one of said standard size brushes.
- 4. A process as defined in claim 1 including the steps of:
- (a-2) modifying each pair of said standard size brush holders by removing a side thereof facing the juxtaposed brush holder of its pair, and
- (a-3) securing each pair of standard size brush holders together by moving the juxtaposed edges thereof into abutting relation and fusing predetermined abutting surfaces thereof together.
- 5. A process as defined in claim 1 including the steps of:
- (a-4) fusing parts of a first bar to at least two points on a first outer surface of each modified brush holder in a juxtaposed pair, thereby to further secure them together, and
- (a-5) fusing parts of a second bar to at least two points on an outer second surface opposite to said first outer surface of each modified brush holder in each juxtaposed pair, thereby to further secure them together.
- 6. A method of making a high-powered, high-speed dynamoelectric machine with a plurality of extra-wide brush holders and associated extra-wide brushes, each of said brushes being mounted in cooperative sliding relationship with a commutator on the machine to prevent film stripping and grooving of the commutator, comprising the steps of:
- (a) providing a dynamoelectric machine having an armature, a commutator electrically connected therewith, and a plurality of studs for mounting sets of brush holders in operating position adjacent to the armature,
- (b) determining the minimum even number of standard size brushes required to carry the rated high armature current of the machine,
- (c) providing a plurality of extra-wide brushes equal in number to half the number of standard size brushes determined by step (b) and making each of said extra-wide brushes about twice as wide as the width of one of said standard size brushes,
- (d) providing a plurality of extra-wide brush holders, each adapted to support one of said extra-wide brushes in operating position,
- (d-1) making each of said extra-wide brush holders by; (1) modifying a pair of standard size brush holders that were originally adapted to mount one of said standard size brushes in operating position, thereby to enable each pair of said standard size brush holders to support an extra-wide brush in operating relationship to the commutator, and (2) securing the standard size brush holders together in said pairs, thereby to provide said plurality of extra-wide brush holders, and
- (e) mounting a plurality of extra-wide brush holders in sets on respective brush holder studs to position each of said extra-wide brushes in operating relationship on the commutator, thereby to restrict current density unbalance between the extra-wide brushes in each set to a range of 10 to 15% of the average brush current.
- 7. A method as defined in claim 6 including the step of:
- (b-1) dividing the number of standard size brushes determined by step (b) into at least three and no more than four, pairs of brushes for each of said sets, and
- (c-1) making each of said extra-wide brushes more than twice and less than three times as wide as the width of one of said standard size brushes.
Parent Case Info
This application is a division of application Ser. No. 378,579, filed May 17, 1982, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
55-103059 |
Aug 1980 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
378579 |
May 1982 |
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