DC motor speed controller having protection

Details DC motor speed controller having protection DC motor speed controller having protection

1987-10-27

1989-07-25

Ro, Bentsu

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388900, 388903, 388910, 388937, H02P 706

Patent

active

048517437

ABSTRACT:
A controller for a battery-driven DC motor controls the average motor current by switching a series-connected FET on and off with a pulse-width-modulated gate signal. Motor speed is changed by changing the duty cycle of the signal, which is generated by an oscillator. An undervoltage protection circuit senses the battery voltage and compares it with a reference system that has hysteresis. An overload protection circuit senses the motor current, integrates the sensed signal, and compares the result with a Zener reference diode that is connected in an amplifier circuit for positive feedback. The oscillator's pulse-width-modulated output, the undervoltage protection circuit's output, and the overload protection circuit's output are input to a "NOR" logic gate, whose output drives the gate of the FET.

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patent: 4581711 (1986-04-01), Hirata et al.
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patent: 4611154 (1986-09-01), Lambropoulos et al.
patent: 4677356 (1987-06-01), Tsuneda et al.

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