US3564342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor control system
Assignee: Westinghouse Electric Corp
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Filing: 1969-05-22
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Granted: 1971-02-16
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Expires: 1989-05-22
Abstract
Abstract Disclosed is a system for operating a chopper-controlled seriesparallel plural motor network, for instance the four traction motors of a vehicle (such as a rapid transit railway car) at a fraction of the line voltage per motor during a starting phase, by controlling the chopper in response to a comparison of the motor voltage and the line voltage thereby to regulate the motor voltage to a desired fraction of the line voltage, for example 25 percent of the line voltage per motor in the four motor case.
Inventors
- 👤 Terry D Sanders
- 👤 Lalan G Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:21
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/18; B; B60; B60L; B60L9/00; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
Electrical apparatus comprising: A. a motor system; B. direct current supply means; C. a controllable chopper having a power circuit connected in series between the direct current supply means and the motor system, said chopper having a control circuit responsive to control signals for controlling the chopper so as to control the power flow from said supply means to said motor system; D. current control means for applying to said control circuit a command signal representing desired motor system current for controlling the cHopper to provide actual motor system current in accordance with the command signal; and E. voltage control means for overriding said current command signal to hold said motor system voltage at a predetermined fraction of the supply voltage.
Claim 2
Dependent Claim
121 words
Electrical apparatus comprising: A. a motor system; B. direct current supply means; C. a controllable chopper having a power circuit connected in series between the direct current supply means and the motor system, said chopper having a control circuit responsive to control signals for controlling the chopper so as to control the power flow from said supply means to said motor system; D. current control means for applying to said control circuit a command signal representing desired motor system current for controlling the cHopper to provide actual motor system current in accordance with the command signal; and E. voltage control means for overriding said current command signal to hold said motor system voltage at a predetermined fraction of the supply voltage.
Claim 3
Dependent Claim
102 words
The combination as in claim 1 wherein said voltage control means comprises: F. means for providing a first signal that is a function of the supply voltage; G. means for providing a second signal that is a function of the motor system voltage; and H. control means responsive to said first and second signals for turning said chopper off when the motor system voltage exceeds a predetermined fraction of the supply voltage and turning said chopper on when the motor system voltage drops below said predetermined fraction, whereby said motor system voltage is regulated to a predetermined fraction of the supply voltage.
Claim 4
Dependent Claim
18 words
The combination as in claim 1 wherein said motor system comprises a plurality of motors connected in series-parallel.
Claim 5
Dependent Claim
67 words
The combination as in claim 1 wherein said motor system includes a plurality of motors connected in series-parallel, and wherein said voltage control means regulates said motor system to a predetermined fraction of the supply voltage such that the voltage across each motor is limited to the value that would be obtained across the motor if all the motors were connected in series across the supply voltage.
Claim 6
Dependent Claim
18 words
The combination as in claim 2 wherein said motor system comprises a plurality of motors connected in series-parallel.
Claim 7
Dependent Claim
67 words
The combination as in claim 2 wherein said motor system includes a plurality of motors connected in series-parallel, and wherein said voltage control means regulates said motor system to a predetermined fraction of the supply voltage such that the voltage across each motor is limited to the value that would be obtained across the motor if all the motors were connected in series across the supply voltage.
Claim 8
Dependent Claim
33 words
The combination as in claim 2 wherein said control means H comprises means for shorting said command signal to ground when the motor system voltage exceeds said predetermined fraction of the supply voltage.
Claim 9
Dependent Claim
108 words
The combination as in claim 1 wherein said voltage control means comprises: I. means for providing a first signal that is a function of the supply voltage; J. means for providing a second signal that is a function of the motor system voltage; K. means for comparing said first and second signals to provide a control output dependent on relations between said signals; and L. means responsive to said control output when the motor system voltage exceeds a predetermined fraction of the supply voltage for overriding said current command signal and controlling said chopper to regulate the motor system voltage to a predetermined fraction of the supply voltage.
Claim 10
Dependent Claim
67 words
The combination as in claim 8 wherein said motor system includes a plurality of motors connected in series-parallel, and wherein said voltage control means regulates said motor system to a predetermined fraction of the supply voltage such that the voltage across each motor is limited to the value that would be obtained across the motor if all the motors were connected in series across the supply voltage.
References Cited (Backward Citations)
US3205420A
Cited
US3317802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |