US3579161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic device
Assignee: Singer General Precision Inc
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Filing: 1969-10-17
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Granted: 1971-05-18
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Expires: 1989-10-17
Abstract
Abstract An electromagnetic device in which a rotor rotates within a stator in response to a plurality of electromagnets formed on the stator being selectively magnetized to cause attraction and repulsion with a north pole portion and a south pole portion of the rotor. Two or more spaced permeable bars are carried by the rotor, and are adapted to provide a variable reluctance path for magnetic flux passing between the rotor and the stator.
Inventors
- 👤 Sigmunt J Kremzner
- 👤 William Pasechnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:42
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/10; H02K37/12; H02K37/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
217 words
An electromagnetic device comprising a pole piece in the form of a rotor and having an axis of rotation and having a north pole member and a south pole member disposed at diametrically opposite ends thereof, electromagnetic means in the form of a stator disposed in proximity to said pole piece and having at least five equispaced teeth having respective curved inner surfaces of substantially identical size and shape adapted to be selectively magnetized to magnetically attract and repel said pole members to cause relative angular movement between said pole piece and said electromagnetic means, and at least one arcuate-shaped permeable bar disposed on each of said pole members and being angularly offset from the radial axis of its pole member, said bar being long enough to overlap two adjacent teeth of said electromagnetic means, said bar having a curved outer surface coinciding with a curved outer surface of its respective pole member, said bar and its pole member having a combined outer surface of selective size and shape facing the inner surfaces of the two adjacent teeth of the electromagnetic means, said bars being spaced diametrically apart and each adapted to provide a variable reluctance path for magnetic flux passing between its pole member of said pole piece and the adjacent teeth of said electromagnetic means.
Claim 2
Dependent Claim
217 words
An electromagnetic device comprising a pole piece in the form of a rotor and having an axis of rotation and having a north pole member and a south pole member disposed at diametrically opposite ends thereof, electromagnetic means in the form of a stator disposed in proximity to said pole piece and having at least five equispaced teeth having respective curved inner surfaces of substantially identical size and shape adapted to be selectively magnetized to magnetically attract and repel said pole members to cause relative angular movement between said pole piece and said electromagnetic means, and at least one arcuate-shaped permeable bar disposed on each of said pole members and being angularly offset from the radial axis of its pole member, said bar being long enough to overlap two adjacent teeth of said electromagnetic means, said bar having a curved outer surface coinciding with a curved outer surface of its respective pole member, said bar and its pole member having a combined outer surface of selective size and shape facing the inner surfaces of the two adjacent teeth of the electromagnetic means, said bars being spaced diametrically apart and each adapted to provide a variable reluctance path for magnetic flux passing between its pole member of said pole piece and the adjacent teeth of said electromagnetic means.
Claim 3
Dependent Claim
50 words
The device of claim 1 wherein there are two bars of substantially identical shape disposed on axially opposite sides of each of said pole members, and wherein said rotor includes a ring member of substantially constant thickness having four recesses on the radially outer edge thereof forming a cross-shaped rotor.
References Cited (Backward Citations)
US3235761A
Cited
US3482126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |