US3739248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self starting electrical motor
Assignee: Rockwell Collins Deutschland GmbH
•
Filing: 1971-12-13
•
Granted: 1973-06-12
•
Expires: 1991-12-13
Abstract
Abstract This invention relates to an electrical motor comprising a permanent magnetic rotor, a stator provided with a single phase operated winding and at least one auxiliary permanent-magnetic pole mounted on the stator for self-starting of said motor in a given direction, and more particularly to an electrical motor which is controlled in starting and running operation.
Inventors
- 👤 H Wehde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:21
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/22; H02K7/00; H02K7/10; H02K7/118
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
166 words
A self-starting single-phase electrical motor comprising, in combination: a permanent magnet rotor composed of a plurality of rotor poles having polarities which alternate about the rotor periphery; a stator having an outer surface facing said rotor and about which said rotor is rotatably mounted, said stator including a plurality of first stator poles; single phase excitation windings wound around said first stator poles to have alternately opposite winding directions from one said first stator pole to the next, current through said excitation windings producing a substantially radially directed magnetic field in front of said first stator poles; source means connected to supply such current to said excitation windings; and means defining at least two permanent magnetic auxiliary poles on said outer surface facing said rotor, said auxiliary poles being magnetized in a substantially radial direction and having a polarity which alternates around the periphery of said outer surface with the centers of said auxiliary poles being angularly offset from the centers of said first stator poles.
Claim 2
Dependent Claim
166 words
A self-starting single-phase electrical motor comprising, in combination: a permanent magnet rotor composed of a plurality of rotor poles having polarities which alternate about the rotor periphery; a stator having an outer surface facing said rotor and about which said rotor is rotatably mounted, said stator including a plurality of first stator poles; single phase excitation windings wound around said first stator poles to have alternately opposite winding directions from one said first stator pole to the next, current through said excitation windings producing a substantially radially directed magnetic field in front of said first stator poles; source means connected to supply such current to said excitation windings; and means defining at least two permanent magnetic auxiliary poles on said outer surface facing said rotor, said auxiliary poles being magnetized in a substantially radial direction and having a polarity which alternates around the periphery of said outer surface with the centers of said auxiliary poles being angularly offset from the centers of said first stator poles.
Claim 3
Dependent Claim
15 words
A motor as defined in claim 1, wherein said auxiliary poles are equally spaced apart.
Claim 4
Dependent Claim
25 words
A motor as defined in claim 1, wherein said source means comprises a source of voltage pulses of one polarity coupled to said excitation winding.
Claim 5
Dependent Claim
44 words
A motor as defined in claim 1, wherein said source means produces voltage pulses, and further comprising controlling means having its output coupled to said source means for reducing the duration and increasing the repetition frequency of the pulses during starting of said motor.
Claim 6
Dependent Claim
46 words
A motor as defined in claim 4, further comprising position for developing means coupled to said motor fordeveloping an output signal indicative of the position of said rotor, and wherein said controlling means is coupled to said position transducer and is responsive to its output signal.
Claim 7
Dependent Claim
32 words
A motor as defined in claim 1, wherein said means defining auxiliary poles comprise a thin layer of permanent magnetic material forming at least part of said outer surface of said stator.
Claim 8
Dependent Claim
39 words
A motor as defined in claim 6, wherein said auxiliary poles are radially magnetized, the magnetic axis of each said auxiliary pole lying on the angle bisector of an angle enclosed by mid-verticals of two adjacent first stator poles.
Claim 9
Dependent Claim
23 words
A motor as defined in claim 6, wherein said permanent magnetic material is an oxide powder bound with a thermoplastic or thermosetting material.
Claim 10
Dependent Claim
29 words
A motor as defined in claim 1, wherein adjacent ones of said first stator poles are magnetized with respectively opposite polarities upon flow of current in said excitation windings.
Claim 11
Dependent Claim
28 words
A motor as defined in claim 1, further comprising an inner gimbal of a gyroscope, said rotor being pivotally mounted on said inner gimbal for driving the gyroscope.
Claim 12
Dependent Claim
77 words
A motor as defined in claim 10, further comprising position transducer means coupled to said motor and responsive to the position of said rotor for developing an output signal indicative of the position of said rotor, and controlling means coupled to said transducer means and responsive to its output signal for developing a control signal, and wherein said source means is coupled to said controlling means and responsive to its control signal for generating an excitation signal.
Claim 13
Dependent Claim
63 words
A motor as defined in claim 10, wherein said source means includes generating means for generating a pulse-modulated high-frequency voltage, means coupled to said generating means for transmitting such voltage, through said gimbal and rectifier means within said gimbal for rectifying the voltage to produce an excitation signal, said excitation winding being coupled to said rectifier means for receiving the excitation signal there-from.
Claim 14
Dependent Claim
65 words
A motor as defined in claim 10, wherein said source means comprises generating means for generating a pulse-modulated high-frequency voltage, inductive means coupled to said generatinG means for transmitting the voltage through said gimbal, and rectifier means mounted on said gimbal for rectifying the voltage to produce an excitation signal, said excitation winding being coupled to said rectifier means for receiving the excitation signal therefrom.
Claim 15
Dependent Claim
65 words
A motor as defined in claim 10, wherein said source means comprises generating means for generating a pulse-modulated high-frequency voltage, capacitive means coupled to said generating means for transmitting the voltage through said gimbal, and rectifier means mounted on said gimbal for rectifying the voltage to produce an excitation signal, said excitation winding being coupled to said rectifier means for receiving the excitation signal therefrom.
Claim 16
Dependent Claim
74 words
A motor as defined in claim 10, further comprising position transducer means including photo-electric means responsive to the position of said rotor for developing an output signal indicative of the position of said rotor, and controlling means coupled to said transducer means and responsive to its output signal for developing a control signal, said source means being coupled to said controlling means and responsive to the control signal therefrom for generating an excitation signal.
Claim 17
Dependent Claim
55 words
A motor as defined in claim 15, further comprising a gyroscope housing and wherein said photo-electric means includes a light source and photo-electric transducer means mounted on said housing, light conducting means mounted on said gimbal in close proximity to its axis, and markings for absorbing light provided on said outer surface of said rotor.
Claim 18
Dependent Claim
15 words
A motor as defined in claim 16, wherein said light conducting means are glass fibers.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |