Motor speed controller

Details Motor speed controller Motor speed controller

1975-04-23

1978-01-03

Rubinson, Gene Z.

Electricity: motive power systems

Battery-fed motor systems

318332, 318341, H02P 500

Patent

active

040669343

ABSTRACT:
A control system for powering the direct current drive motor of an electric vehicle from a storage battery employs a semi-conductor switch to connect the battery to the motor. Speed control of the vehicle is achieved through operator control of an accelerator which provides an analog output voltage. A multi-vibrator provides a bi-valued output signal varying between 100% on time and 100% off time as a function of the accelerator output. The motor energizing switch is conditioned by this output and by the output of a circuit which compares the motor armature current to a reference value. The circuit includes protection elements so that the switch is opened when the armature current exceeds a preset maximum and is allowed to close again if the multivibrator is still in an "on" mode when the armature current decays below a lower preset value.

REFERENCES:
patent: 3223909 (1965-12-01), Sensing et al.
patent: 3349309 (1967-10-01), Dannettell
patent: 3441827 (1969-04-01), Payne
patent: 3716767 (1973-02-01), Kuriyama et al.
patent: 3855520 (1974-12-01), Stich

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