US Patent No: 4,924,125
Number of patents in Portfolio can not be more than 2000
Electric motor or alternator
Stats
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May 8, 1990
Issued date -
May 3, 1989
filing date -
07/349,939
serial no -
Expired
status
Importance
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Abstract
A permanent magnet rotary dynamo electric machine such as a high speed three phase brushless motor has at least one stator and at least one rotor spaced apart from one another by a cylindrical gap therebetween. A plurality of permanent magnetic poles are provided by a plurality of rare earth magnets positioned side by side on the inside of a cup shaped rotor and oriented parallel to the rotor axis. The stator has a plurality of wound poles of shallow depth which are wound on or close to the surface of a substrate of low magnetic permeability (less than 20 times that of air). The wound poles are positioned adjacent the cylindrical gap so as to intersect the magnetic flux paths between adjacent permanent magnetic poles.
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First Claim
Related Publications
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International Classification(s)
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- [Patents Count]
Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,217,508 DC motor | 89 | 1978 | |
| 4,417,167 DC Brushless motor | 40 | 1981 | |
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| 4,651,066 Ferrite permanent magnet electrical machine and the application thereof within vehicle traction drives | 48 | 1984 | |
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| 4,426,606 Emergency stop device for brushless motors | 21 | 1982 | |
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| 4,260,920 Multi-pole permanent magnet rotor | 40 | 1978 | |
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| 4,733,118 Low damping torque brushless D.C. motor | 68 | 1986 | |
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| 4,665,331 Brushless DC micromotor | 33 | 1986 | |
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| 4,471,252 Rotary dynamo electric machine with protection against demagnetization of low flux portion of permanent magnet poles | 15 | 1982 | |
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| 4,692,631 Turbine alternator with a central clear optical path | 20 | 1986 | |
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| 4,636,671 Magneto generator for internal combustion engine | 12 | 1984 | |
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| 4,268,769 Motor for rotary brush | 21 | 1978 | |
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| 4,418,296 Magneto-generator for engine ignition systems | 6 | 1981 | |
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| 4,303,843 Multiple magnetic flywheel driven by a centrifugal clutch | 24 | 1980 | |
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| 4,638,201 Electronically commutated dc motor | 30 | 1986 | |
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| 4,645,961 Dynamoelectric machine having a large magnetic gap and flexible printed circuit phase winding | 63 | 1983 | |
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| 4,438,342 Novel hybrid electric vehicle | 60 | 1981 | |