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US4745348A
Expired / Lapsed
US
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Apparatus for starting and running a plurality of three-phase motors from a single-phase power source
Assignee: Individual
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Filing: 1986-09-22
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Granted: 1988-05-17
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Expires: 2006-09-22
Abstract
Abstract An apparatus for starting and running a plurality of three-phase motors from a single-phase power source is described. Two of the main coils of a three-phase motor are used to run the motor as a single-phase induction motor. The third coil of a three-phase motor is used as a starting coil and is selectively powered through a switch and a capacitor. The capacitor provides the necessary difference in the phase angle of the current in the starting coil and the main coils to provide starting torque for the operation of the motor.
Inventors
- 👤 William T. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:35
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
Apparatus for starting and running a plurality of three-phase motors from a single-phase power source, each said motor having at least three terminals, said single-phase power source providing a predetermined voltage between a first conductor and a second conductor, comprising: phase shifting means connected to said first conductor for providing a phase-shifted voltage; first switching means connected to said phase shifting means for selectively applying said phase-shifted voltage to a third conductor; and a plurality of second switching means, each said second switching means being connected between said first, second, and third conductors, and a particular one of said motors for selectively connecting said first, second, and third conductors to said first, second, and third terminals, respectively, of said particular one of said motors; wherein said first switching means applies said phase-shifted voltage to said third conductor during starting of each of said three-phase motors.
Claim 2
Dependent Claim
145 words
Apparatus for starting and running a plurality of three-phase motors from a single-phase power source, each said motor having at least three terminals, said single-phase power source providing a predetermined voltage between a first conductor and a second conductor, comprising: phase shifting means connected to said first conductor for providing a phase-shifted voltage; first switching means connected to said phase shifting means for selectively applying said phase-shifted voltage to a third conductor; and a plurality of second switching means, each said second switching means being connected between said first, second, and third conductors, and a particular one of said motors for selectively connecting said first, second, and third conductors to said first, second, and third terminals, respectively, of said particular one of said motors; wherein said first switching means applies said phase-shifted voltage to said third conductor during starting of each of said three-phase motors.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1, wherein said phase shifting means comprises a capacitor.
Claim 4
Dependent Claim
14 words
The apparatus of claim 1, wherein said first switching means is a momentary switch.
Claim 5
Dependent Claim
15 words
The appartus of claim 1, wherein said first switching means is a push button switch.
Claim 6
Dependent Claim
16 words
The apparatus of claim 1, wherein each of said second switching means comprises a three-pole switch.
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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |