Dynamic drag arrangement for electrically propelled traction veh

Details Dynamic drag arrangement for electrically propelled traction veh Dynamic drag arrangement for electrically propelled traction veh

1977-01-26

1978-07-25

Hohauser, Herman J.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Braking

318376, H02P 314

Patent

active

041032110

ABSTRACT:
A propulsion system for traction vehicles utilizing separately excited electric traction motors in which a level of reverse motor torque is produced when speed control is released to effect a dynamic drag on the vehicle. The system simulates in an electric vehicle the dynamic drag effect characteristic of an internal combustion engine driven vehicle when the accelerator is released. The effect is attained by providing a motor armature regenerative current path through a load resistor and by maintaining motor field current at a selected minimum level when the speed control is released. A function generator adapted to regulate motor field current as a function of motor armature current provides a minimum field current signal when armature current is less than a selected value to thereby maintain field current and motor torque when the speed control is released.

REFERENCES:
patent: 3651388 (1972-03-01), Machin, Jr. et al.
patent: 3728599 (1971-07-01), Minami
patent: 4010407 (1977-03-01), Lombard

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