US5294875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enhanced polyphase motor operation using a solid state inverter
Assignee: Otis Elevator Co
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Filing: 1991-02-15
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Granted: 1994-03-15
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Expires: 2011-02-15
Abstract
Abstract A polyphase motor is powered by an inverter. Each phase winding in the motor comprises two electrically insulated, electromagnetically coupled, conductors, making up a "phase bundle." Each conductor in the bundle is powered by its own transistor drive. The drives for each phase winding respond to a common phase signal for instance from a pulse width modulator.
Inventors
- 👤 Narasimha K. Reddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:32
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/28; H02K11/00; H02K11/30; H02K11/33
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
A polyphase motor drive including an inverter and a polyphase motor, comprising: a plurality of phase drives, each phase drive responsive to a phase drive input signal, each phase drive for providing a current signal; a motor having a plurality of phase windings, each winding comprising at least two electrically insulated, electromagnetically coupled conductors wound together, each conductor corresponding to one of said phase drives, each of said conductors being responsive to a corresponding one of said current signals for providing current to said motor.
Claim 2
Dependent Claim
85 words
A polyphase motor drive including an inverter and a polyphase motor, comprising: a plurality of phase drives, each phase drive responsive to a phase drive input signal, each phase drive for providing a current signal; a motor having a plurality of phase windings, each winding comprising at least two electrically insulated, electromagnetically coupled conductors wound together, each conductor corresponding to one of said phase drives, each of said conductors being responsive to a corresponding one of said current signals for providing current to said motor.
Claim 3
Dependent Claim
18 words
The polyphase motor drive of claim 1, wherein said phase windings are wound together in the same slot.
Claim 4
Dependent Claim
84 words
A polyphase motor drive, including a polyphase motor, comprising: a plurality of phase drives, each phase drive including a pair of complementary transistors, each phase drive responsive to a phase drive input signal, each phase drive providing a current signal; a motor having a plurality of phase windings, each phase winding comprising at least two electrically insulated conductors, each conductor corresponding to one of said phase drive, each conductor responsive to a corresponding one of said current signals for providing currents to said motor.
Claim 5
Dependent Claim
84 words
A polyphase motor drive, including a polyphase motor, comprising: a plurality of phase drives, each phase drive including a pair of complementary transistors, each phase drive responsive to a phase drive input signal, each phase drive providing a current signal; a motor having a plurality of phase windings, each phase winding comprising at least two electrically insulated conductors, each conductor corresponding to one of said phase drive, each conductor responsive to a corresponding one of said current signals for providing currents to said motor.
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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) | 1997-03-14 | 1997-09-13 | 1998-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-14 | 2001-09-13 | 2002-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-14 | 2005-09-13 | 2006-03-15 | $7700.00 | Window Closed / Lapsed |