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US3569753A
Expired / Lapsed
US
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Self-starting single phase motor
Assignee: Lockheed Martin Corp
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Filing: 1968-07-02
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Granted: 1971-03-09
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Expires: 1988-07-02
Abstract
Abstract A permanent magnetic motor is provided having main and angularly displaced auxiliary windings and means for detecting the direction of rotation of the motor''s permanent pole rotor and for producing control signals to cause the motor to rotate in a desired direction. The structure for detecting the rotor rotational direction comprises two separate electrical windings which inductively couple with the magnet pieces of the rotor so that when the rotor rotates, voltages are induced in both of the windings, which voltages are compared to determine whether the rotor is moving in a clockwise or counterclockwise direction of rotation. If the desired direction of rotation is detected, then the input signal applied to the main winding is not altered. If the direction of rotation is opposite to the desired rotation, then a signal of opposite polarity is applied to the main windings. In the event no signal output is detected from the two electrical windings, indicating that the motor did not start, then a pulse of either polarity is applied to the auxiliary winding, such that it initiates rotation, and then direction is sensed and controlled, as above. Thus, the motor may be started and once started may be rotated in a selected direction of rotation.
Inventors
- 👤 Jirair A Babikyan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:02
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/24; H02K29/00; H02K29/06; H02K29/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
91 words
A self-starting single phase synchronous motor, comprising: a rotor assembly, said rotor assembly being mounted for rotation and having a plurality of field magnetic pieces; a stator assembly, said stator assembly having a main winding and a first and second rotation direction detecting windings, said rotation direction detecting windings being angularly displaced from each other; and said rotor assembly being arranged to project a magnetic field through said stator assembly so as to inductively couple a signal into each of said rotation direction detection windings upon rotation of said rotor assembly.
Claim 2
Dependent Claim
91 words
A self-starting single phase synchronous motor, comprising: a rotor assembly, said rotor assembly being mounted for rotation and having a plurality of field magnetic pieces; a stator assembly, said stator assembly having a main winding and a first and second rotation direction detecting windings, said rotation direction detecting windings being angularly displaced from each other; and said rotor assembly being arranged to project a magnetic field through said stator assembly so as to inductively couple a signal into each of said rotation direction detection windings upon rotation of said rotor assembly.
Claim 3
Dependent Claim
27 words
A self-starting single phase synchronous motor in accordance with claim 1, in which said stator assembly further includes an auxiliary winding angularly displaced from said main winding.
Claim 4
Dependent Claim
85 words
A self-starting single phase synchronous motor in accordance with claim 2, in which said rotor assembly comprises first and second field units, said first and second field units mounted for rotation together on an axis, said first and second field units being spaced apart in the direction of said axis to provide a gap, said magnetic pieces arranged to direct a magnetic field of uniform intensity across said gap, said stator assembly being disposed in said gap and secured against rotation with said field units.
Claim 5
Dependent Claim
47 words
A self-starting single phase synchronous motor in accordance with claim 3, in which said main winding, said auxiliary winding and said first and second rotation direction detecting windings are disposed in planes parallel to and electrically insulated from each other, said planes being perpendicular to said axis.
Claim 6
Dependent Claim
34 words
A self-starting single phase synchronous motor in accordance with claim 3, in which each of said field units comprise a plurality of equally spaced magnetic pieces located in a circular fashion around said axis.
Claim 7
Dependent Claim
49 words
A self-starting single phase synchronous motor in accordance with claim 5, in which said main winding and said auxiliary winding each comprise a metallic type winding bonded to a substrate and each defining a tortuous path corresponding to spaces around and between said magnet pieces of said field units.
Claim 8
Dependent Claim
71 words
A self-starting single phase synchronous motor in accordance with claim 6, in which the angular displacement between said main winding and said auxiliary winding is such that at one position of said rotor''s rotation cycle the radial portions of said main winding are in registration with the spaces between said magnetic pieces and the radial portions of said auxiliary winding are substantially in registration with the center of said magnetic pieces.
Claim 9
Dependent Claim
28 words
A self-starting single phase synchronous motor in accordance with claim 6, in which the angular displacement between said main winding and said auxiliary winding is pi /2 radians.
Claim 10
Dependent Claim
112 words
A self-starting single phase synchronous motor as defined in claim 6 in which said first and second rotor direction detecting winding each comprise a metallic type winding bonded to a substrate substantially perpendicular to said axis, each having a generally spiral configuration and defining a series of alternately positive and negative slope winding sections joined at their adjacent ends, said sections defining a path such that at one position of said motor''s rotation cycle each of said winding sections of one of said detecting windings cross one corner of said adjacent magnetic piece on said field unit, passes over the geometric center of said magnetic piece and across the opposite corner thereof.
Claim 11
Dependent Claim
47 words
A self-starting single phase synchronous motor in accordance with claim 9 in which each of said first and said second rotation direction detecting windings is comprised of N winding sectIons, where N is equal to the number of said magnetic pieces on one of said field units.
Claim 12
Dependent Claim
59 words
A self-starting single phase synchronous motor in accordance with claim 9 in which the angular displacement between said first and second rotation direction detecting windings is one-half of the mechanical angle which lies between a centerline which passes through one of said magnetic pieces and a centerline which passes through an adjacent magnetic piece lying in the same plane.
Claim 13
Dependent Claim
29 words
A self-starting single phase synchronous motor in accordance with claim 9 in which the electrical angle between said first and second rotation direction detecting windings is pi /2 radians.
Claim 14
Dependent Claim
74 words
A self-starting single phase synchronous motor in accordance with claim 9 in which said winding sections of said one of said direction detecting windings crosses one corner of said adjacent magnetic pieces on said field units, passes over the geometric center of said magnetic piece and across the opposite corner thereof when the radial portions of said main winding are substantially in registration with the spaces between said magnetic pieces on said field units.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |