Patent US3696258A successfully refreshed from Google Patents.
US3696258A
Expired / Lapsed
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Electret motors capable of continuous rotation
Assignee: General Time Corp
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Filing: 1970-07-30
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Granted: 1972-10-03
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Expires: 1990-07-30
Abstract
Abstract An electric motor comprises a rotor including a plurality of electret portions and a stator including an array of fixed electrode pairs for driving the electret rotor in response to an applied AC voltage. A significant advantage of this motor is the fact that it does not require either wound conductive coils or a laminated metal core; consequently, it can be more easily fabricated than typical prior art motors. In a preferred embodiment, the rotor comprises a rotatably mounted circular disc including a plurality of electret portions disposed at equal angular intervals around the rotor disc. The stator can comprise a pair of fixed discs, having a plurality of opposing electrode portions.
Inventors
- 👤 Wilmer C Anderson
- 👤 Robert W Windebank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:25
CPC Classifications
G; G04; G04C; G04C3/00; G04C3/16; H; H02; H02N; H02N1/00; H02N1/002; H02N1/004; Y; Y10; Y10S; Y10S55/00; Y10S55/39
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
An electric motor capable of continuous rotation comprising, a rotor mechanically coupled to a rotatable shaft, said rotor comprising a disc having a plurality of electret poles uniformly distributed around the circumference in a circular pattern, and a stator including a pair of plates positioned on each side of said rotor and being coaxially aligned therewith, each plate having a plurality of electrodes uniformly distributed about the circumference thereof in a circular pattern.
Claim 2
Dependent Claim
73 words
An electric motor capable of continuous rotation comprising, a rotor mechanically coupled to a rotatable shaft, said rotor comprising a disc having a plurality of electret poles uniformly distributed around the circumference in a circular pattern, and a stator including a pair of plates positioned on each side of said rotor and being coaxially aligned therewith, each plate having a plurality of electrodes uniformly distributed about the circumference thereof in a circular pattern.
Claim 3
Dependent Claim
23 words
A motor according to claim 1 wherein the circular patterns of said electret poles and said electrodes are of substantially the same radius.
Claim 4
Dependent Claim
21 words
A motor according to claim 2 wherein the electrodes of the stator plates are opposite one another to form electrode pairs.
Claim 5
Dependent Claim
23 words
A motor according to claim 3 wherein said rotor is rotatably mounted between said stator plates at a position substantially equidistant between them.
Claim 6
Dependent Claim
18 words
A motor according to claim 4 wherein there are at least as many electrode pairs as electret poles.
Claim 7
Dependent Claim
18 words
A motor according to claim 5 wherein the number of electrode pairs equals the number of electret poles.
Claim 8
Dependent Claim
14 words
A motor according to claim 6 wherein successive electret poles have the same polarity.
Claim 9
Dependent Claim
30 words
A motor according to claim 6 wherein; successive electret poles have inverted polarities; and means are provided for inverting the polarity of the AC voltage applied to successive electrode pairs.
Claim 10
Dependent Claim
16 words
A motor according to claim 1 adaPted to operate in response to a multiphase AC voltage.
Claim 11
Dependent Claim
22 words
A motor according to claim 9 wherein the number of electrode pairs is an integral multiple of the number of electret poles.
Claim 12
Dependent Claim
58 words
A motor according to claim 10 wherein; the number of electrode pairs is twice the number of electret poles; successive electret poles are of inverted polarity; and means are provided for applying to successive electrode pairs, AC signals having a 90* phase difference, and for inverting the polarity of successive electrodes receiving AC signals of the same phase.
Claim 13
Dependent Claim
47 words
An electric motor capable of continuous rotation comprising: a plurality of rotors coupled to a common rotatable shaft, each of said rotors including one or more electret poles; and a stator including a plurality of electrodes for driving said rotors in response to an applied AC signal.
Claim 14
Dependent Claim
47 words
An electric motor capable of continuous rotation comprising: a plurality of rotors coupled to a common rotatable shaft, each of said rotors including one or more electret poles; and a stator including a plurality of electrodes for driving said rotors in response to an applied AC signal.
References Cited (Backward Citations)
US2232143A
Cited
US2993159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |