US3732357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-starting synchronous integrated motor-wheel drive
Assignee: Westinghouse Electric Corp
•
Filing: 1971-11-10
•
Granted: 1973-05-08
•
Expires: 1991-11-10
Abstract
Abstract A color filter wheel for a color television system is integrated into a motor to decrease size and weight, and to minimize noise associated with bearings and gears. The wheel is rotatably mounted on a frame and has rotor poles mounted concentrically about its axis of rotation and stator poles mounted on the frame in operative spaced relationship to the rotor poles. Different pairs of stator poles are sequentially aligned with different pairs of rotor poles as the wheel rotates and are sequentially energized by a pulsating DC source for causing rotation of the filter wheel. Means are provided for varying the frequency of the pulsating DC source for ease of starting the wheel and for synchronizing the wheel rotation with the scanning frames of the television camera.
Inventors
- 👤 F Rushing
- 👤 R Aulthouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:17
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
131 words
In a color television system in which a wheel having a plurality of radially spaced color filters is rotatably mounted on an axis in front of a television camera and drive means rotate said wheel so that said color filters interrupt the light input to the camera in synchronism with the electronic scanning of each frame of said camera; the improvement in said drive means comprising: rotor elements mounted concentrically with said axis of rotation around the periphery of said wheel; stator elements fixedly mounted with respect to said wheel and concentric with said axis of rotation of said wheel, said stator elements being spaced from said rotor elements by an air gap; and means to sequentially magnetize said stator elements to cause rotation of said wheel about its mounting axis.
Claim 2
Dependent Claim
131 words
In a color television system in which a wheel having a plurality of radially spaced color filters is rotatably mounted on an axis in front of a television camera and drive means rotate said wheel so that said color filters interrupt the light input to the camera in synchronism with the electronic scanning of each frame of said camera; the improvement in said drive means comprising: rotor elements mounted concentrically with said axis of rotation around the periphery of said wheel; stator elements fixedly mounted with respect to said wheel and concentric with said axis of rotation of said wheel, said stator elements being spaced from said rotor elements by an air gap; and means to sequentially magnetize said stator elements to cause rotation of said wheel about its mounting axis.
Claim 3
Dependent Claim
23 words
A color television system according to claim 1 wherein said stator elements form an arc about said axis of rotation of said wheel.
Claim 4
Dependent Claim
19 words
A color television system according to claim 2 wherein said stator elements form an arc of less than 180*.
Claim 5
Dependent Claim
28 words
A color television system according to claim 1 wherein said rotor and stator elements are so spaced that a torque results when said stator elements are sequentially energized.
Claim 6
Dependent Claim
67 words
A color television system according to claim 1 wherein said rotor elements include a plurality of poles of magnetizable material spaced about the circumference of said wheel; and said stator elements include a plurality of magnetizable poles aligned with said rotor poles as said wheel rotates, said stator poles being spaced such that different pairs of wheel and stator poles are sequentially aligned as said wheel rotates.
Claim 7
Dependent Claim
39 words
A color television system according to claim 5 wherein said magnetizing means comprise a DC source, a coil surrounding each of said stator poles, and means for sequentially coupling said DC source to said coils surrounding said stator poles.
Claim 8
Dependent Claim
26 words
A color television system according to claim 6 and further comprising means for varying the frequency of coupling said stator pole coils with said DC source.
Claim 9
Dependent Claim
52 words
A color television system according to claim 5 wherein two of said pairs of said wheel and stator poles are aligned during a given time interval so that the magnetic flux resulting from energized stator poles follows a closed loop through two of said rotor poles and two of said stator poles.
Claim 10
Dependent Claim
25 words
A color television system according to claim 8 wherein there are at least three sets of stator poles which are sequentially magnetized during each cycle.
Claim 11
Dependent Claim
23 words
A color television system according to claim 5 wherein there are at least three stator poles which are sequentially energized during each cycle.
Claim 12
Dependent Claim
20 words
A color television system according to claim 1 wherein said rotor elements are mounted about the circumference of said wheel.
Claim 13
Dependent Claim
148 words
In an apparatus for use in connection with television cameras for producing color pictures, said apparatus comprising: a frame; a wheel having a plurality of color filters arranged radially about said wheel; means mounting said wheel on said frame for rotational movement about a central axis thereof; and means for rotatably driving said wheel about said axis; the improvement in said rotatable driving means comprising; magnetizable rotor elements mounted around the periphery of said wheel concentrically with said central axis; stator elements mounted on said frame and arranged in an arc shape, said stator elements being operably spaced from said rotor elements by an air gap; means for sequentially magnetizing said stator elements; and said stator elements being so spaced from each other that said sequential energizing of said stator elements produces a torque between different pairs of rotor and stator elements, thereby causing rotation of said wheel.
Claim 14
Dependent Claim
148 words
In an apparatus for use in connection with television cameras for producing color pictures, said apparatus comprising: a frame; a wheel having a plurality of color filters arranged radially about said wheel; means mounting said wheel on said frame for rotational movement about a central axis thereof; and means for rotatably driving said wheel about said axis; the improvement in said rotatable driving means comprising; magnetizable rotor elements mounted around the periphery of said wheel concentrically with said central axis; stator elements mounted on said frame and arranged in an arc shape, said stator elements being operably spaced from said rotor elements by an air gap; means for sequentially magnetizing said stator elements; and said stator elements being so spaced from each other that said sequential energizing of said stator elements produces a torque between different pairs of rotor and stator elements, thereby causing rotation of said wheel.
Claim 15
Dependent Claim
57 words
An apparatus according to claim 12 wherein said stator elements are connected by a magnetizable material and said rotor elements are connected by a magnetizable material, and wherein said stator elements are magnetized in pairs so that a circular flux path is formed between each magnetized pair of stator elements and a corresponding pair of rotor elements.
Claim 16
Dependent Claim
34 words
An apparatus according to claim 12 wherein said magnetizing means includes a DC source, a magnetizing coil surrounding each of said stator elements, and means sequentially coupling said DC source to said magnetizing coils.
Claim 17
Dependent Claim
49 words
An apparatus according to claim 14 and further comprising means to vary the frequency of said sequential coupling means so that said wheel can be started at a relatively low frequency of magnetizing said coils and thereafter brought up to a higher speed for synchronization with a television camera.
Claim 18
Dependent Claim
16 words
An apparatus according to claim 12 wherein said rotor elements are circumferentially spaced about said wheel.
Claim 19
Dependent Claim
17 words
An apparatus according to claim 12 wherein said stator elements form an arc of less than 180*.
Claim 20
Dependent Claim
16 words
An apparatus according to claim 12 wherein said stator elements form an arc of about 90*.
References Cited (Backward Citations)
US2329194A
Cited
US2312800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |