Patent US5548172A successfully refreshed from Google Patents.
US5548172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet line start motor having magnets outside the starting cage
Assignee: General Electric Co
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Filing: 1995-10-27
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Granted: 1996-08-20
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Expires: 2015-10-27
Abstract
Abstract A rotor for use in a line start permanent magnet motor comprises a rotor core having a shaft and including teeth defining slots; a rotor cage, at least a portion of which extends through the slots; and a layer of composite permanent magnet material at least partially coating the rotor core.
Inventors
- 👤 Gerald B. Kliman
- 👤 Mark A. Preston
- 👤 Donald W. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:10
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/46; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/2726; H02K15/00; H02K15/02; H02K15/03; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/4902; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
A rotor for use in a line start permanent magnet motor, comprising: a rotor core having a shaft and including teeth defining slots; a rotor cage, at least a portion of which extends through said slots; and a layer of permanent magnet material at least partially coating said core and comprising molded NdFeB composite material.
Claim 2
Dependent Claim
55 words
A rotor for use in a line start permanent magnet motor, comprising: a rotor core having a shaft and including teeth defining slots; a rotor cage, at least a portion of which extends through said slots; and a layer of permanent magnet material at least partially coating said core and comprising molded NdFeB composite material.
Claim 3
Dependent Claim
67 words
A rotor for use in a line start permanent magnet motor, comprising: a rotor core having a shaft and including teeth defining slots; a rotor cage, at least a portion of which extends through said slots; and a layer of permanent magnet material at least partially coating said core, wherein at least some of said teeth have side edges extending through said layer of permanent magnet material.
Claim 4
Dependent Claim
67 words
A rotor for use in a line start permanent magnet motor, comprising: a rotor core having a shaft and including teeth defining slots; a rotor cage, at least a portion of which extends through said slots; and a layer of permanent magnet material at least partially coating said core, wherein at least some of said teeth have side edges extending through said layer of permanent magnet material.
Claim 5
Dependent Claim
35 words
The rotor of claim 2, wherein said layer of permanent magnet material comprises a plurality of substantially parallel magnet strips, each of said magnet strips being situated between a respective pair of said side edges.
Claim 6
Dependent Claim
24 words
The rotor of claim 3, further including filler material between at least some of said magnet strips and respective pairs of said side edges.
Claim 7
Dependent Claim
22 words
The rotor of claim 4, wherein said filler material is one selected from a group consisting of an epoxy and a plastic.
Claim 8
Dependent Claim
23 words
The rotor of claim 3, wherein at least some of said magnet strips fill a space between respective pairs of said side edges.
Claim 9
Dependent Claim
28 words
The rotor of claim 3, wherein at least some pairs of said side edges have respective side edge portions which are at least partially slanted towards one another.
Claim 10
Dependent Claim
29 words
The rotor of claim 3, wherein each of said slots and each respective one of said magnet strips is separated by a respective thin web of the rotor core.
Claim 11
Dependent Claim
28 words
The rotor of claim 8, wherein at least some pairs of said side edges have respective side edge portions which are at least partially slanted towards one another.
Claim 12
Dependent Claim
34 words
The rotor of claim 8, wherein each respective thin web is thinner at a central portion of a respective one of said magnet strips and thicker closer to edges of the respective magnet strip.
References Cited (Backward Citations)
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US2710931A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-20 | 2000-02-19 | 2000-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-20 | 2004-02-19 | 2004-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-20 | 2008-02-19 | 2008-08-20 | $7700.00 | Window Closed / Lapsed |