US5355070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction motor drive stability control circuit
Assignee: AC Propulsion Inc
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Filing: 1993-03-10
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Granted: 1994-10-11
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Expires: 2013-03-10
Abstract
Abstract A circuit generates phase pole command signals for controlling operation of an induction motor. To minimize instabilities occurring within the motor, a stability control circuit generates a phase shift signal, which is input to reference signal generators to adjust phase reference signals. When in a motoring mode, the phases of the reference signals are advanced monotonically with respect to the electro-motive force of the induction motor. When in a regeneration mode, the phases of the reference signals are decreased monotonically with respect to the electro-motive force. The resulting adjustment to the phases of the reference signals minimizes instabilities within the feedback control of the induction motor.
Inventors
- 👤 Alan G. Cocconi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:57
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; B; B60; B60L; B60L50/00; B60L50/50; B60L50/51; B60L2220/00; B60L2220/10; B60L2220/12; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A stability controller for a polyphase electric motor comprising: means for receiving a phase reference signal; means for generating a phase shift signal that increases monotonically with motor e.m.f.; and means for generating phase pole command signals from said phase reference and phase shift signals, wherein said means for generating phase pole command signals from a comparison of said phase reference and said phase shift signals comprises: a first differential amplifier receiving said phase reference signal and a first current input signal and outputting a first error signal; a second differential amplifier receiving said phase reference signal and a second current input signal and outputting a second error signal; a summer receiving said first and second error signal and outputting a negative sum of said first and second error signals; a triangular wave oscillator; and fourth, fifth and sixth differential amplifiers, each receiving a signal from said triangular wave oscillator and respectively receiving said first, second and negative sum signals, said fourth, fifth and sixth differential amplifier outputting said phase pole command signals.
Claim 2
Dependent Claim
173 words
A stability controller for a polyphase electric motor comprising: means for receiving a phase reference signal; means for generating a phase shift signal that increases monotonically with motor e.m.f.; and means for generating phase pole command signals from said phase reference and phase shift signals, wherein said means for generating phase pole command signals from a comparison of said phase reference and said phase shift signals comprises: a first differential amplifier receiving said phase reference signal and a first current input signal and outputting a first error signal; a second differential amplifier receiving said phase reference signal and a second current input signal and outputting a second error signal; a summer receiving said first and second error signal and outputting a negative sum of said first and second error signals; a triangular wave oscillator; and fourth, fifth and sixth differential amplifiers, each receiving a signal from said triangular wave oscillator and respectively receiving said first, second and negative sum signals, said fourth, fifth and sixth differential amplifier outputting said phase pole command signals.
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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) | 1997-10-10 | 1998-04-11 | 1998-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-10 | 2002-04-11 | 2002-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-10 | 2006-04-11 | 2006-10-11 | $7700.00 | Window Closed / Lapsed |