Patent US5880550A successfully refreshed from Google Patents.
US5880550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-speed dynamotor
Assignee: Ebara Corp
•
Filing: 1996-03-26
•
Granted: 1999-03-09
•
Expires: 2016-03-26
Abstract
Abstract A variable-speed dynamotor has a stator having a first set of windings that provide a number of poles for rotating a rotor and a second set of windings that provide a number of poles different from the number of poles provided by the first set of windings. Voltages or currents supplied to the second set of windings are controlled to generate radial forces acting on the rotor for thereby controlling a radial position of the rotor, suppressing vibrations of the rotor, adjusting rotational balancing of the rotor, and controlling radial damping of the rotor.
Inventors
- 👤 Tadashi Fukao
- 👤 Akira Chiba
- 👤 Chikara Michioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:38
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0474; F16C32/0493; F16C32/0497; F16C32/0444; H; H02; H02K; H02K7/00; H02K7/08; H02K7/09; H02P; H02P27/00; H02P27/04; H02P27/05; H02P2207/00; H02P2207/07; H02P2207/073; Y; Y02; Y02E; Y02E20/00; Y02E20/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
185 words
A variable-speed dynamotor comprising: a rotor having rotor windings which is connected to a first semiconductor power converter via a slip ring; and a stator having both a first set of windings that provide a number of poles and a second set of windings that provide a number of poles different from the number of poles provided by said first set of windings, said first set of windings being directly connected to power system terminals, and said second set of windings being connected to a second semiconductor power converter; whereby said first semiconductor power converter supplies currents to said rotor windings for generating electric energy in said first set of windings in the stator under a desired voltage at a desired frequency to the power system terminals regardless of the rotational speed of said rotor; and whereby said second semiconductor power converter supplies currents to said second set of windings for generating radial forces acting on said rotor for thereby controlling a radial position of said rotor, suppressing vibrations of said rotor, adjusting rotational balancing of said rotor, and controlling radial damping of said rotor.
Claim 2
Dependent Claim
185 words
A variable-speed dynamotor comprising: a rotor having rotor windings which is connected to a first semiconductor power converter via a slip ring; and a stator having both a first set of windings that provide a number of poles and a second set of windings that provide a number of poles different from the number of poles provided by said first set of windings, said first set of windings being directly connected to power system terminals, and said second set of windings being connected to a second semiconductor power converter; whereby said first semiconductor power converter supplies currents to said rotor windings for generating electric energy in said first set of windings in the stator under a desired voltage at a desired frequency to the power system terminals regardless of the rotational speed of said rotor; and whereby said second semiconductor power converter supplies currents to said second set of windings for generating radial forces acting on said rotor for thereby controlling a radial position of said rotor, suppressing vibrations of said rotor, adjusting rotational balancing of said rotor, and controlling radial damping of said rotor.
Claim 3
Dependent Claim
25 words
A variable-speed dynamotor according to claim 1, wherein said first set of windings comprises two-pole windings, and said second set of windings comprises four-pole windings.
Claim 4
Dependent Claim
25 words
A variable-speed dynamotor according to claim 1, wherein said first set of windings comprises four-pole windings, and said second set of windings comprises two-pole windings.
Claim 5
Dependent Claim
39 words
A variable-speed dynamotor according to claim 1, further comprising: a rotor radial position detector for detecting voltages and currents of said second set of windings and estimating said radial position of said rotor from the detected voltages and currents.
References Cited (Backward Citations)
US4338557A
Cited
US4503377A
Cited
US4625160A
Cited
JPH02193547A
Cited
US5083077A
Cited
US5260642A
Cited
US5291115A
Cited
US5384527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-08 | 2002-09-07 | 2003-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-08 | 2006-09-07 | 2007-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-08 | 2010-09-07 | 2011-03-09 | $7700.00 | Window Closed / Lapsed |