Patent US3784850A successfully refreshed from Google Patents.
US3784850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric pulse motor
Assignee: Fujitsu Ltd
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Filing: 1971-12-27
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Granted: 1974-01-08
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Expires: 1991-12-27
Abstract
Abstract The disclosure relates to an improved electric pulse motor having an arrangement wherein, with respect to a rotor element having a number of rotor-teeth, a stator assembly including a number of geometrically and electrically paired laminated U-shape stator elements is assembled based upon the conventional arrangement, but, the rotor element is provided with a specific construction for strengthening the rotor-teeth, so that radially extended rotor-teeth are reduced in axial thicknesses so as not to increase moment of inertia, making it possible to obtain a large magnetic attractice force from the stator elements so as to provide a large output torque. The stator elements are also provided with a structure and members to provide a large magnetic attractice force so that a large output torque is obtainable from the electric pulse motor.
Inventors
- 👤 S Inaba
- 👤 Y Ikebe
- 👤 S Yamamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:11
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/02; H02K37/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
An electric pulse motor comprising: a single rotor having a rotor shaft and a plurality of radially extending rotor teeth spaced at equal tooth pitch on a hub which is formed unitary with said rotor teeth and is mounted on the rotor shaft, said rotor further having supporting members, each of which is disposed between adjacent rotor teeth for providing a physical connection between said adjacent rotor teeth; side plate means comprising a pair of plates; bearing means mounted on each said plate for rotatably supporting said monostage rotor between said plates; a stator including a plurality of geometrically and electrically paired U-shaped stator elements mounted stationary in said side plate means while maintaining predetermined spaces between different paired stator elements, said paired U-shaped stator elements consisting of a pair of U-shaped stator cores, each made of U-shaped magnetic material laminations, said paired Ushaped stator cores having stator teeth formed on at least a pair of mutually opposing end surfaces thereof to axially face said rotor teeth, and; excitation winding means wound on each said stator core.
Claim 2
Dependent Claim
177 words
An electric pulse motor comprising: a single rotor having a rotor shaft and a plurality of radially extending rotor teeth spaced at equal tooth pitch on a hub which is formed unitary with said rotor teeth and is mounted on the rotor shaft, said rotor further having supporting members, each of which is disposed between adjacent rotor teeth for providing a physical connection between said adjacent rotor teeth; side plate means comprising a pair of plates; bearing means mounted on each said plate for rotatably supporting said monostage rotor between said plates; a stator including a plurality of geometrically and electrically paired U-shaped stator elements mounted stationary in said side plate means while maintaining predetermined spaces between different paired stator elements, said paired U-shaped stator elements consisting of a pair of U-shaped stator cores, each made of U-shaped magnetic material laminations, said paired Ushaped stator cores having stator teeth formed on at least a pair of mutually opposing end surfaces thereof to axially face said rotor teeth, and; excitation winding means wound on each said stator core.
Claim 3
Dependent Claim
47 words
An electric pulse motor as claimed in claim 1, wherein said paired U-shaped stator cores have stator teeth formed on both pairs of mutually opposing end surfaces thereof for providing an outer magnetic pole pair and an inner magnetic pole pair along said radially extending rotor teeth.
Claim 4
Dependent Claim
37 words
An electric pulse motor as claimed in claim 2, further comprising a cylindrical casing arranged between said side plate means to define air gaps between said magnetic poles of said U-shaped stator cores and said rotor teeth.
Claim 5
Dependent Claim
57 words
An electric pulse motor as claimed in claim 1, further comprising core members fixed on said pair of mutually opposing end surfaces of said paired U-shaped stator cores, each of said core members being made of radially laminated magnetic material and having a surface provided with said stator teeth formed thereon to axially face said rotor teeth.
Claim 6
Dependent Claim
19 words
An electric pulse motor as claimed in claim 1, wherein said supporting members are integral of said rotor teeth.
Claim 7
Dependent Claim
36 words
An electric pulse motor as claimed in claim 1, wherein said supporting members are resin material embedded in the spaces between adjacent rotor teeth so as to have the same axial thickness as said rotor teeth.
Claim 8
Dependent Claim
25 words
An electric pulse motor as claimed in claim 1, wherein said supporting members consist of a rim-shaped beam disposed on tops of said rotor teeth.
Claim 9
Dependent Claim
23 words
An electric pulse motor as claimed in claim 5, wherein said supporting members have openings for decreasing weight and the moment of inertia.
Claim 10
Dependent Claim
19 words
An electric pulse motor as claimed in claim 5, wherein said supporting members are formed as shortened curved portions.
Claim 11
Dependent Claim
22 words
An electric pulse motor as claimed in claim 5, wherein said supporting members comprise rim-shaped beam members disposed between said rotor teeth.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |