US3836802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet motor
Assignee: General Electric Co
•
Filing: 1973-09-06
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Granted: 1974-09-17
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Expires: 1993-09-06
Abstract
Abstract A dynamoelectric machine in which the stator has permanent magnet poles composed of a soft magnetic material. The sides of each magnet pole have rare earth magnets around and in contact with their outer extremities. The surfaces of these rare earth magnets in contact with the magnet poles have the same polarity as the surface of the magnet poles which they contact. The rare earth magnets serve to reduce stray magnetic flux and thereby concentrate the magnetic flux in the air gap between the stator and the rotor.
Inventors
- 👤 R Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:21
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04; H02K23/40; H02K23/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A dynamoelectric machine comprising: a rotor; a stator consisting of at least two permanent magnet poles composed of soft magnetic material having an inner surface spaced a short distance from said rotor to form an air gap, said poles also having at least one side surface and an outer surface; at least one rare earth magnet surrounding and in contact with the side surface of each of said magnet poles, the rare earth magnet having the portion of its surface in contact with its associated magnet pole of the same polarity as the magnet pole.
Claim 2
Dependent Claim
95 words
A dynamoelectric machine comprising: a rotor; a stator consisting of at least two permanent magnet poles composed of soft magnetic material having an inner surface spaced a short distance from said rotor to form an air gap, said poles also having at least one side surface and an outer surface; at least one rare earth magnet surrounding and in contact with the side surface of each of said magnet poles, the rare earth magnet having the portion of its surface in contact with its associated magnet pole of the same polarity as the magnet pole.
Claim 3
Dependent Claim
20 words
A dynamoelectric machine as claimed in claim 1 in which the rare earth magnets are composed of cobalt and samarium.
Claim 4
Dependent Claim
130 words
A dynamoelectric machine comprising: a rotor; a stator consisting of at least two permanent magnet poles composed of soft magnetic material, each pole having an inner surface spaced a short distance from said rotor to form an air gap, said magnet poles being of square cross-sectional configuration to provide four sides; a rare earth magnet positioned in proximity to each of the four sides of each magnet pole, the inner surfaces of oppositely disposed rare earth magnets having the same polarity and with the inner surfaces of at least one set of oppositely disposed magnets having the same polarity as their associated magnet pole; and magnetic return path elements connected to the surface of two oppositely positioned rare earth magnets at surfaces of said magnets opposite the said magnet pole.
Claim 5
Dependent Claim
130 words
A dynamoelectric machine comprising: a rotor; a stator consisting of at least two permanent magnet poles composed of soft magnetic material, each pole having an inner surface spaced a short distance from said rotor to form an air gap, said magnet poles being of square cross-sectional configuration to provide four sides; a rare earth magnet positioned in proximity to each of the four sides of each magnet pole, the inner surfaces of oppositely disposed rare earth magnets having the same polarity and with the inner surfaces of at least one set of oppositely disposed magnets having the same polarity as their associated magnet pole; and magnetic return path elements connected to the surface of two oppositely positioned rare earth magnets at surfaces of said magnets opposite the said magnet pole.
Claim 6
Dependent Claim
39 words
A dynamoelectric machine as claimed in claim 3 which includes means to rotate two oppositely disposed rare earth magnets whereby the polarity of the rotatable rare earth magnets may be varied with respect to the nonrotatable rare earth magnets.
Claim 7
Dependent Claim
24 words
A dynamoelectric machine as claimed in claim 4 in which the means to rotate the two rare earth magnets consists of a ring gear.
Claim 8
Dependent Claim
20 words
A dynamoelectric machine as claimed in claim 4 in which the rare earth magnets are composed of cobalT and samarium.
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |