Patent US3180844A successfully refreshed from Google Patents.
Patent US3693034A successfully refreshed from Google Patents.
US3693034A
Expired / Lapsed
US
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Pulse motor assembly
Assignee: Tokai Rika Co Ltd
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Filing: 1971-04-06
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Granted: 1972-09-19
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Expires: 1991-04-06
Abstract
Abstract A pulse motor assembly comprising a plurality of synchronous motors connected in tandem. Each of the synchronous motors includes a rotor having pole teeth each tapering towards its free end which is formed as a sharp pointed end. The north and south poles of permanent magnet stator included in the respective synchronous motors are staggered from each other by a distance equivalent to one pole pitch divided by the number of the synchronous motors connected.
Inventors
- 👤 Tokuzo Inariba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:04
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/10; H02K37/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A pulse motor assembly comprising: a casing; a partition of soft magnetic material provided in said casing to form magnetically shielded rooms in cooperation with the casing; a rotary shaft made of non-magnetic material and rotatably supported by said casing, and a plurality of synchronous motors mounted in the respective rooms formed by said partition and each including a multiphase exciting coil, a permanent magnet stator disposed concentrically with said exciting coil and magnetized to provide north and south poles alternating on the periphery thereof, and a rotor fixed to said rotary shaft and having a plurality of pole teeth each tapered from its base portion towards its free end and disposed between said exciting coil and said permanent magnet stator, said north and south poles of the permanent magnet stators included in the respective synchronous motors being staggered from each other by a distance equivalent to one pole pitch divided by the number of the synchronous motors mounted.
Claim 2
Dependent Claim
159 words
A pulse motor assembly comprising: a casing; a partition of soft magnetic material provided in said casing to form magnetically shielded rooms in cooperation with the casing; a rotary shaft made of non-magnetic material and rotatably supported by said casing, and a plurality of synchronous motors mounted in the respective rooms formed by said partition and each including a multiphase exciting coil, a permanent magnet stator disposed concentrically with said exciting coil and magnetized to provide north and south poles alternating on the periphery thereof, and a rotor fixed to said rotary shaft and having a plurality of pole teeth each tapered from its base portion towards its free end and disposed between said exciting coil and said permanent magnet stator, said north and south poles of the permanent magnet stators included in the respective synchronous motors being staggered from each other by a distance equivalent to one pole pitch divided by the number of the synchronous motors mounted.
Claim 3
Dependent Claim
100 words
The device of claim 1 in which said casing includes an axially extending peripheral wall of soft magnetic material and a pair of end walls, said plurality of synchronous motors being axially spaced along and within said casing with one in each said room, said partition comprising a single soft magnetic material plate extending in radially overlapping relation with the rotors of two adjacent motors, said rotors of said adjacent motors being separated by said plate, said plate extending radially into contact with said casing peripheral wall, each said adjacent motor having an alternately magnetic circuit including the same plate.
Claim 4
Dependent Claim
44 words
The device of claim 2 including a pair of coaxial locking rings extending fixedly and coaxially from opposite sides of said plate into adjacent rooms, said rotor teeth in said adjacent rooms being spaced radially between said locking rings and said permanent magnet stator.
Claim 5
Dependent Claim
73 words
The device of claim 3 in which the two motors in the two rooms separated by said plate are arranged in mirror imaged, back to back relation, said plate being located in axially centered but spaced opposed relation to the permanent magnet stators of said two motors and separated therefrom by radial portions of the two rotors of said two motors, the pole teeth of said two rotors extending away from said plate.
Claim 6
Dependent Claim
59 words
The device of claim 2 in which two coils are provided for each stator and set of pole teeth and including switch means for actuating said two coils alternatively so that one is energized while the other is deenergized, all pole teeth of a given synchronous motor being energized by said multiphase exciting coil with the same magnetic polarity.
References Cited (Backward Citations)
US3348083A
Cited
US3549918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |