Patent US2422012A successfully refreshed from Google Patents.
US3673477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pole-changing, three-phase alternating current induction motor, with single-layer stator winding
Assignee: National Research Development Corp UK
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Filing: 1970-02-09
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Granted: 1972-06-27
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Expires: 1990-02-09
Abstract
Abstract A three-phase, two-speed pole-changing induction motor, using the pole-changing method of pole-amplitude modulation, which has a single-layer stator winding, diamond or concentric coils being used as preferred. The stator coil layout is derived from the stator coil layout of a corresponding double-layer winding for the same alternative pole-numbers. The present invention provides a two-speed, three-phase alternating current electric motor having a single layer stator winding with alternative connections providing alternative polenumbers by a modified method of pole-amplitude modulation.
Inventors
- 👤 Alexander Richard Wil Broadway
- 👤 William Fong
- 👤 Gordon Hindle Rawcliffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:56
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/12; H02K17/14; H02K3/00; H02K3/04; H02K3/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A three-phase alternating current, two-speed, pole-amplitude modulation pole-changing, induction motor having a stator winding, with diamond coils wound in a 6N-slot stator, where N is an integer, the coil sides in odd-numbered stator slots defining phase bands in the sequence A, B, C and A, C, B, according to the sense around the stator circumference considered, the corresponding other side of each coil being located in an evennumbered slot, uniformly spaced by an odd number of slots throughout the winding.
Claim 2
Dependent Claim
80 words
A three-phase alternating current, two-speed, pole-amplitude modulation pole-changing, induction motor having a stator winding, with diamond coils wound in a 6N-slot stator, where N is an integer, the coil sides in odd-numbered stator slots defining phase bands in the sequence A, B, C and A, C, B, according to the sense around the stator circumference considered, the corresponding other side of each coil being located in an evennumbered slot, uniformly spaced by an odd number of slots throughout the winding.
Claim 3
Dependent Claim
102 words
A three-phase alternating current, two-speed, pole-amplitude modulation pole-changing, induction motor having a stator winding, with concentric coils wound in a 6N-slot stator, where N is an integer, the coil sides in odd-numbered stator slots defining phase bands in the sequence A, B, C and A, C, B, according to the sense around the stator circumference considered, ''''go'''' and ''''return'''' coil sides of each phase-winding being spaced apart throughout the winding by a uniform and odd number of slots, individual ''''go'''' and ''''return'''' sides of the same phase-windings and the same switched parts thereof for pole-changing being connected together to form concentric coils.
Claim 4
Dependent Claim
102 words
A three-phase alternating current, two-speed, pole-amplitude modulation pole-changing, induction motor having a stator winding, with concentric coils wound in a 6N-slot stator, where N is an integer, the coil sides in odd-numbered stator slots defining phase bands in the sequence A, B, C and A, C, B, according to the sense around the stator circumference considered, ''''go'''' and ''''return'''' coil sides of each phase-winding being spaced apart throughout the winding by a uniform and odd number of slots, individual ''''go'''' and ''''return'''' sides of the same phase-windings and the same switched parts thereof for pole-changing being connected together to form concentric coils.
Claim 5
Dependent Claim
78 words
A three-phase alternating current, two-speed, pole-amplitude modulation pole-changing, induction motor having a stator winding, with concentric coils wound in a 6N-slot stator, where N is an integer, the coil sides in successive slots defining phase-bands in the sequence A, B, C and A, C, B, according to the sense around the stator circumference considered, individual ''''go'''' and ''''return'''' sides of the same phase-windings and the same switched parts thereof for pole-changing being connected together to form concentric coils.
Claim 6
Dependent Claim
78 words
A three-phase alternating current, two-speed, pole-amplitude modulation pole-changing, induction motor having a stator winding, with concentric coils wound in a 6N-slot stator, where N is an integer, the coil sides in successive slots defining phase-bands in the sequence A, B, C and A, C, B, according to the sense around the stator circumference considered, individual ''''go'''' and ''''return'''' sides of the same phase-windings and the same switched parts thereof for pole-changing being connected together to form concentric coils.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |