Motor speed control circuit apparatus

Details Motor speed control circuit apparatus Motor speed control circuit apparatus

1977-07-22

1979-03-06

Smith, Jr., David

Electricity: motive power systems

Supplied or controlled by space-transmitted electromagnetic...

46254, 244190, 318269, H04Q 702

Patent

active

041433076

ABSTRACT:
A pulse width modulated DC motor speed control circuit for models including a demodulator for receiving an input pulse having a width which may vary from a reference width, and for generating a first positive output pulse having a width proportional to the variation when the width of the input pulse is less than the reference width and for generating a second positive output pulsehaving a width proportional to the variation when the width of the input pulse exceeds the reference width, and a braking circuit for receiving the first output pulse and in response thereto causing any back EMF generated by the motor to be shorted for the duration of the output pulse, and a driving circuit for receiving the second output pulse and in response thereto connecting a source of power across the motor for the duration of the output pulse.

REFERENCES:
patent: 3260912 (1966-07-01), Gregory
patent: 3548271 (1970-12-01), Kampfer
patent: 3957230 (1976-05-01), Boucher et al.

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