US4433260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hysteresis synchronous motor utilizing polarized rotor
Assignee: Kearfott Guidance and Navigation Corp
•
Filing: 1982-10-12
•
Granted: 1984-02-21
•
Expires: 2002-10-12
Abstract
Abstract A hysteresis synchronous motor in which a rotor includes arcuate permanent magnets mounted adjacent to the hysteresis ring material. Permanent magnetic poles are induced in the ring material by the rotating electromagnetic stator field. After start-up, the rotor remains synchronized with the rotating field due to the mutual attraction of opposite magnetic poles.
Inventors
- 👤 Leon E. Weisbord
- 👤 Francis W. Wessbecher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:46
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K19/00; H02K19/02; H02K19/04; H02K19/08; Y; Y10; Y10S; Y10S310/00; Y10S310/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
In a hysteresis synchronous motor having a centrally disposed shaft having a longitudinal axis and a stator coaxial with the shaft and a rotor assembly, said rotor assembly comprising: connecting means for mounting the rotor assembly on the shaft; first and second hysteresis rings coaxial with the shaft and mounted in axially spaced relationship to each other; a plurality of peripherally spaced coplanar juxtaposed arcuate-shaped permanent magnets located in radially spaced coaxial relation to the shaft and forming an annular assembly located between the rings, the magnets having similar poles positioned in confronting relation to form a flux distribution around the periphery of the rotor, the distribution characterized by sharp flux peaks in the vicinity of the confronting poles, together with a first and second non-magnetic spacing means located between first and second confronting surfaces of the magnets and axially spaced said first and second hysteresis rings disposed on either side thereof for limiting the magnetic shunting effect of the rings.
Claim 2
Dependent Claim
161 words
In a hysteresis synchronous motor having a centrally disposed shaft having a longitudinal axis and a stator coaxial with the shaft and a rotor assembly, said rotor assembly comprising: connecting means for mounting the rotor assembly on the shaft; first and second hysteresis rings coaxial with the shaft and mounted in axially spaced relationship to each other; a plurality of peripherally spaced coplanar juxtaposed arcuate-shaped permanent magnets located in radially spaced coaxial relation to the shaft and forming an annular assembly located between the rings, the magnets having similar poles positioned in confronting relation to form a flux distribution around the periphery of the rotor, the distribution characterized by sharp flux peaks in the vicinity of the confronting poles, together with a first and second non-magnetic spacing means located between first and second confronting surfaces of the magnets and axially spaced said first and second hysteresis rings disposed on either side thereof for limiting the magnetic shunting effect of the rings.
Claim 3
Dependent Claim
19 words
The structure set forth in claim 1 wherein the rings are comprised of stacked laminations fabricated from hysteresis material.
Claim 4
Dependent Claim
16 words
The structure set forth in claim 1 wherein the rings are comprised of solid hysteresis material.
Claim 5
Dependent Claim
78 words
A synchronous hysteresis motor comprising: an output shaft; a stator; a rotor connected to the shaft and comprising: first and second axially spaced hysteresis rings defining an axial space therebetween; a plurality of peripherally spaced coplanar arcuate permanent magnets positioned in juxtaposition said first and second hysteresis rings within the space; first and second non-magnetic spacers respectively interposed between the coplanar magnets and said first and second hysteresis rings for limiting the magnetic shunting effect of the rings.
Claim 6
Dependent Claim
78 words
A synchronous hysteresis motor comprising: an output shaft; a stator; a rotor connected to the shaft and comprising: first and second axially spaced hysteresis rings defining an axial space therebetween; a plurality of peripherally spaced coplanar arcuate permanent magnets positioned in juxtaposition said first and second hysteresis rings within the space; first and second non-magnetic spacers respectively interposed between the coplanar magnets and said first and second hysteresis rings for limiting the magnetic shunting effect of the rings.
Claim 7
Dependent Claim
49 words
The structure set forth in claim 4 wherein the magnets are positioned so that similar poles are located in confronting relation to each other to form a flux distribution around the periphery of the rotor, the distribution characterized by sharp flux peaks in the vicinity of the confronting poles.
Claim 8
Dependent Claim
19 words
The structure set forth in claim 5 wherein the rings are comprised of stacked laminations fabricated from hysteresis material.
Claim 9
Dependent Claim
16 words
The structure set forth in claim 5 wherein the rings are comprised of solid hysteresis material.
References Cited (Backward Citations)
US2547599A
Cited
US2784331A
Cited
US2810085A
Cited
US3068373A
Cited
US3181018A
Cited
US3164735A
Cited
GB960944A
Cited
US3411059A
Cited
US3334254A
Cited
US3956650A
Cited
SU716117A1
Cited
US4347457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |