US3560816A
Expired / Lapsed
US
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Driving system for traction purposes
Assignee: ABB Norden Holding AB
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Filing: 1968-10-14
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Granted: 1971-02-02
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Expires: 1988-10-14
Abstract
Abstract An electrical traction system with parallel-connected groups of series motors is provided with means for switching over to a condition with a constant number of field ampere turns when maximal adhesion is desired.
Inventors
- 👤 Sigfrid Franzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:54
CPC Classifications
B; B60; B60L; B60L50/00; B60L50/10; B60L50/11; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/7072
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
Driving system for traction purposes comprising a plurality of direct current motors mechanically connected to different wheel axles, the motors being divided into parallel-connected groups, each group comprising at least one rotor and being provided with means to excite the motor poles selectively with a constant number of ampere turns or with a number of ampere turns substantially proportional to the rotor current, the excitation with a constant number of ampere turns being intended for starting and relatively low speeds.
Claim 2
Dependent Claim
80 words
Driving system for traction purposes comprising a plurality of direct current motors mechanically connected to different wheel axles, the motors being divided into parallel-connected groups, each group comprising at least one rotor and being provided with means to excite the motor poles selectively with a constant number of ampere turns or with a number of ampere turns substantially proportional to the rotor current, the excitation with a constant number of ampere turns being intended for starting and relatively low speeds.
Claim 3
Dependent Claim
100 words
Driving system according to claim 1, in which there are at least two motors in each group and the field windings of the motors of each of said groups are series connected with each other and with the rotors of the group, and wherein said selective exciting means comprises a controllable current source, and means to connect said current source to said series-connected windings for additional excitation at starting and low speeds, the control magnitude of the current source consisting of the difference between a reference value and a magnitude which is proportional to the current through the field windings.
Claim 4
Dependent Claim
30 words
Driving system according to claim 1, in which said selective exciting means comprises a tachometer means responsive to the speed for switching between the two excitation alternatives of the system.
Claim 5
Dependent Claim
77 words
Driving system according to claim 1 in which each motor comprises a rotor and a field winding series connected therewith, wherein said selective exciting means comprises a controllable current source and means to connect said current source across said field winding, for additional excitation at starting and low speeds, the control magnitude of the current source consisting of the difference between a reference value and a magnitude which is proportional to the current through said field winding.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |