US3736482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery powered electric traction system
Assignee: Fiat SpA
•
Filing: 1971-10-28
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Granted: 1973-05-29
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Expires: 1991-10-28
Abstract
Abstract A speed controlled electric traction system comprising a direct current compound electric motor having means for controlling its speed from zero up to its maximum value with a minimum energy loss on the speed regulation. The means for controlling the speed of the motor comprise a rheostat in series with the shunt field windings of the motor and linked to a voltage controller in series with the series field winding and armature of the motor. The voltage controller can be one of a number of different types such as a rheostat, a potentiometer allied to a controlled rectifier or a potential dividing switch arrangement acting on the individual cells of the battery. The voltage controller of the armature circuit and the rheostat of the shunt winding are linked together and to an operating member such that as the motor is controlled from standstill the maximum voltage is applied to the shunt winding as the voltage on the armature winding is progressively increased up to a maximum value, and thereafter the voltage on the armature winding is maintained at a maximum while the voltage on the shunt field winding is progressively reduced until the motor attains its maximum speed.
Inventors
- 👤 G Brusaglino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:17
CPC Classifications
B; B60; B60L; B60L50/00; B60L50/50; B60L50/52; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/70; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/905
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
290 words
A battery powered electric motor system comprising in combination: a direct current compound electric motor battery means for supplying power to said motor, a rheostat in series with the shunt field winding of said compound electric motor, a voltage regulating device in circuit with the armature and series field winding of said compound electric motor, said voltage regulating device being linked to said rheostat for adjusting movement therewith, an operating means for adjusting said rheostat and said voltage regulating device, said operating means being movable between a rest position corresponding to de-energization of said motor, and a second position corresponding to maximum speed of said motor, said rheostat and said voltage regulating device being connected to said operating means such that a said operating means is moved from said rest position towards said second position said rheostat maintains said shunt field winding at maximum voltage while said voltage regulating device supplies said armature circuit with a progressively increasing voltage up to the maximum provided by said battery whereafter, on further movement of said operating means toward said second position said voltage regulating device maintains said armature circuit at said maximum value while said rheostat progressively reduces the voltage of said shunt field winding until said motor obtains its maximum speed, first circuit means for maintaining said motor energized when said operating means is returned to said rest position while said motor is running, as long as the speed of said motor remains above a predetermined value, and second circuit means for directly supplying power from said motor to said battery means when said operating means is returned to said rest position while said motor is running and as long as the speed of said motor remains above a predetermined value.
Claim 2
Dependent Claim
290 words
A battery powered electric motor system comprising in combination: a direct current compound electric motor battery means for supplying power to said motor, a rheostat in series with the shunt field winding of said compound electric motor, a voltage regulating device in circuit with the armature and series field winding of said compound electric motor, said voltage regulating device being linked to said rheostat for adjusting movement therewith, an operating means for adjusting said rheostat and said voltage regulating device, said operating means being movable between a rest position corresponding to de-energization of said motor, and a second position corresponding to maximum speed of said motor, said rheostat and said voltage regulating device being connected to said operating means such that a said operating means is moved from said rest position towards said second position said rheostat maintains said shunt field winding at maximum voltage while said voltage regulating device supplies said armature circuit with a progressively increasing voltage up to the maximum provided by said battery whereafter, on further movement of said operating means toward said second position said voltage regulating device maintains said armature circuit at said maximum value while said rheostat progressively reduces the voltage of said shunt field winding until said motor obtains its maximum speed, first circuit means for maintaining said motor energized when said operating means is returned to said rest position while said motor is running, as long as the speed of said motor remains above a predetermined value, and second circuit means for directly supplying power from said motor to said battery means when said operating means is returned to said rest position while said motor is running and as long as the speed of said motor remains above a predetermined value.
Claim 3
Dependent Claim
65 words
The battery powered electric motor system of claim 1 wherein said voltage regulating device is another rheostat connected between said battery and said armature circuit of said motor and said second circuit means includes a diode connected across the terminals of said other rheostat to allow the passagE of reverse current from said motor to said battery to by pass the resistance of said rheostat.
Claim 4
Dependent Claim
72 words
The battery powered electric motor system of claim 1 wherein said first circuit means for maintaining said motor energized when said operating means is returned to said rest position while said motor is running as long as the speed of said motor remains above a predetermined value, comprises a relay controlled by a dynamo driven by said motor, said relay controlling a separate supply circuit between said armature circuit and said battery.
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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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |