Patent US6054837A successfully refreshed from Google Patents.
US6054837A
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Polyphase induction electrical rotating machine
Assignee: WheelTug PLC
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Filing: 1996-09-18
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Granted: 2000-04-25
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Expires: 2016-09-18
Abstract
Abstract A polyphase induction machine operated by an inverter drive system. The machine is constructed with concentrated full span windings. Twelve or more phases are used to sufficiently cover the airgap region, in contrast to the conventional three phases using distributed and chorded windings. Substantial efficiency and starting torque benefits are thereby obtained.
Inventors
- 👤 Jonathan Edelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:17
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; H02P27/08; H02K; H02K17/00; H02K17/02; H02K17/12; H02K3/00; H02K3/04; H02K3/28; H02K29/00; H02K29/03; H02P27/047
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
83 words
An electrical rotating machine comprising an induction machine, supplied with polyphase alternating current by variable voltage, variable frequency drive, the improvement wherein being the use of a plurality of phases numbering twelve or greater in both said induction machine and said drive, a stator of said induction machine being characterized by star connected, full span, concentrated windings, said stator of said induction machine having a ratio of phases to poles of greater than or equal to twelve phases per each two stator poles.
Claim 2
Dependent Claim
83 words
An electrical rotating machine comprising an induction machine, supplied with polyphase alternating current by variable voltage, variable frequency drive, the improvement wherein being the use of a plurality of phases numbering twelve or greater in both said induction machine and said drive, a stator of said induction machine being characterized by star connected, full span, concentrated windings, said stator of said induction machine having a ratio of phases to poles of greater than or equal to twelve phases per each two stator poles.
Claim 3
Dependent Claim
24 words
An electrical rotating machine as in claim 1, wherein said stator of said induction machine in further characterized as being a two pole stator.
Claim 4
Dependent Claim
53 words
An electrical rotating machine as in claim 1, wherein said stator of said induction machine is further characterized by having irregularly positioned windings, wherein said variable voltage, variable frequency drive is configured to produce an asymmetrical alternating current output suitable to supply said irregularly positioned windings of said stator of said induction machine.
Claim 5
Dependent Claim
27 words
An electrical rotating machine as in claim 1, wherein said variable voltage, variable frequency drive system is capable of variation of phase angle of said alternating current.
Claim 6
Dependent Claim
21 words
An electrical rotating machine as in claim 1, wherein said inverter drive system causes induction machine operation at high saturation levels.
Claim 7
Dependent Claim
24 words
An electrical rotating machine as in claim 5, wherein said high saturation levels are of flux density greater than 150,000 lines per square inch.
Claim 8
Dependent Claim
25 words
An electrical rotating machine as in claim 1, wherein said plurality of phases numbering twelve or greater is further limited to even number of phases.
Claim 9
Independent Claim
123 words
A method for employing rotating harmonic fields to increase torque and efficiency of a two pole electrical rotating machine comprising: a. wiring said electrical rotating machine with full span concentrated windings, said windings being positioned at relative electrical angles, the number of said windings being twelve or greater, the position of said windings possibly irregular, and b. supplying each of said windings with an individual phase of polyphase alternating current, said polyphase alternating current having a phase count of twelve or greater, and containing both fundamental and harmonic current, and c. controlling each of said phase of said polyphase alternating current such that the relative phase angle of each of said phases corresponds to said relative electrical angles of each of said windings.
Claim 10
Independent Claim
123 words
A method for employing rotating harmonic fields to increase torque and efficiency of a two pole electrical rotating machine comprising: a. wiring said electrical rotating machine with full span concentrated windings, said windings being positioned at relative electrical angles, the number of said windings being twelve or greater, the position of said windings possibly irregular, and b. supplying each of said windings with an individual phase of polyphase alternating current, said polyphase alternating current having a phase count of twelve or greater, and containing both fundamental and harmonic current, and c. controlling each of said phase of said polyphase alternating current such that the relative phase angle of each of said phases corresponds to said relative electrical angles of each of said windings.
Claim 11
Dependent Claim
80 words
An electrical rotating machine consisting of an induction machine operated by variable voltage, variable frequeney drive, the improvement wherein being the use of a plurality of phases numbering twelve or greater in both said induction machine and said drive, said induction machine being further characterized by full span concentrated windings, said drive system being further characterized by push/pull inverter legs driving both sides of each phase, said induction machine being further characterized by having each of said phases electrically independent.
Claim 12
Dependent Claim
80 words
An electrical rotating machine consisting of an induction machine operated by variable voltage, variable frequeney drive, the improvement wherein being the use of a plurality of phases numbering twelve or greater in both said induction machine and said drive, said induction machine being further characterized by full span concentrated windings, said drive system being further characterized by push/pull inverter legs driving both sides of each phase, said induction machine being further characterized by having each of said phases electrically independent.
Claim 13
Dependent Claim
19 words
An electrical rotating machine as in claim 9, wherein said stator of induction machine is a two pole stator.
Claim 14
Dependent Claim
62 words
An electrical rotating machine consisting of an induction machine, supplied with polyphase alternating current by variable voltage, variable frequency drive, the improvement wherein being the use or a plurality of phases numbering twelve or greater in both a stator of said induction machine and said drive, said stator of said induction machine being further characterized by star connected, full span, concentrated windings.
Claim 15
Dependent Claim
62 words
An electrical rotating machine consisting of an induction machine, supplied with polyphase alternating current by variable voltage, variable frequency drive, the improvement wherein being the use or a plurality of phases numbering twelve or greater in both a stator of said induction machine and said drive, said stator of said induction machine being further characterized by star connected, full span, concentrated windings.
Claim 16
Dependent Claim
23 words
An electrical rotating machine an in claim 11, wherein said stator of said induction machine is further characterized as a two pole stator.
Claim 17
Dependent Claim
36 words
An electrical rotating machine as in claim 11, wherein said stator of said induction machine is further characterized by a ratio of phases to poles of greater than or equal to twelve phases per two poles.
Claim 18
Dependent Claim
23 words
An electrical rotating machine as in claim 11, wherein said plurality of phases numbering twelve or greater is an even number of phases.
Claim 19
Dependent Claim
53 words
An electrical rotating machine as in claim 11, wherein said stator of said induction machine is further characterized by having irregularly positioned windings, wherein said variable voltage, variable frequency drive in configured to produce an asymmetrical alternating current output suitable to supply said irregularly positioned windings of said stator of said induction machine.
Claim 20
Dependent Claim
27 words
An electrical rotating machine as in claim 11, wherein said variable voltage, variable frequency drive system is capable of variation of phase angle of said alternating current.
Claim 21
Dependent Claim
21 words
An electrical rotating machine as in claim 11, wherein said inverter drive system causes induction machine operation at high saturation levels.
Claim 22
Dependent Claim
23 words
An electrical rotating machine as in claim 17, wherein said saturation levels are of flux density greater than 150,000 lines per square inch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-25 | 2003-10-25 | 2004-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-25 | 2007-10-25 | 2008-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-25 | 2011-10-25 | 2012-04-25 | $7700.00 | Window Closed / Lapsed |