US3562612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor powered reversible dual motor drive with voltage and current feedback
Assignee: Westinghouse Electric Corp
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Filing: 1968-10-21
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Granted: 1971-02-09
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Expires: 1988-10-21
Abstract
Abstract Described is a thyristor power system for a pair of motors which drive a common shaft. Two power supplies, a motor controller, and an internal system of feedback networks are so arranged that the motors are automatically regulated to provide substantially equal load division. The arrangements also features adaptability of interconnection of two motors and two power supplies, in various mode to accommodate emergency loss of a one motor or one power supply, or to accommodate special cases of loading.
Inventors
- 👤 William A Munson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:33
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/68; H02P5/69
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A system for supplying electrical power to a pair of direct current motors drivingly connected to a common shaft, comprising a pair of reversible thyristor power supplies, first switch means for connecting either of said motors to either of said power supplies, second switch means for connecting both of said power supplies in parallel to either one of said motors, third switch means for connecting both of said motors in series to either one of said power supplies, a thyristor firing circuit for each of said power supplies, an error integrating voltage controller responsive to a bipolar reference signal for controlling both of said firing circuits, and means for applying voltage and current feedback signals from said motors to said error integrating voltage controller.
Claim 2
Independent Claim
124 words
A system for supplying electrical power to a pair of direct current motors drivingly connected to a common shaft, comprising a pair of reversible thyristor power supplies, first switch means for connecting either of said motors to either of said power supplies, second switch means for connecting both of said power supplies in parallel to either one of said motors, third switch means for connecting both of said motors in series to either one of said power supplies, a thyristor firing circuit for each of said power supplies, an error integrating voltage controller responsive to a bipolar reference signal for controlling both of said firing circuits, and means for applying voltage and current feedback signals from said motors to said error integrating voltage controller.
Claim 3
Dependent Claim
85 words
The system of claim 1 wherein said means for applying voltage and current feedback signals to said controller comprises a device for deriving a voltage feedback signal from at least one of said motors and for applying said voltage feedback signal to said voltage controller, meanS for deriving current feedback signals from both of said motors and for summing said current feedback signals to derive a current limit signal for said voltage controller, and means for applying said current limit signal to said voltage controller.
Claim 4
Dependent Claim
34 words
The system of claim 1 wherein said error integrating voltage controller includes voltage signal integrator means for integrating any differential between said reference signal and the summation of said voltage and current feedback signals.
Claim 5
Dependent Claim
74 words
The system of claim 1 wherein each of said thyristor power supplies comprises a pair of output conductors, first and second unidirectional rectifier units of the phase gated type connected across said conductors in mutually oppositely poled relationship, the thyristor firing circuit for each power supply acting to vary the polarity and magnitude of the output from said pair of output conductors in response to a change in the output of said voltage controller.
Claim 6
Dependent Claim
44 words
The system of claim 4 including a source of three-phase alternating current, said unidirectional rectifier units each being constructed and arranged to receive the three-phase components in three individual phase gated device networks, and means connecting said device networks to said thyristor firing circuit.
Claim 7
Dependent Claim
51 words
Apparatus in accordance with claim 5 wherein each of said device networks includes first and second thyristor devices connected in series across said pair of output conductors, the circuit junction point between the two thyristors of each network forming the input terminal for a three-phase component of the alternating current source.
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |