Motor speed control device for use in an image forming apparatus

Details Motor speed control device for use in an image forming apparatus Motor speed control device for use in an image forming apparatus

1990-10-31

1992-02-04

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

388811, 388911, H02P 100

Patent

active

050862618

ABSTRACT:
A motor speed control device for use in an image forming apparatus with a differential phase detection circuit for outputting differential phase data between the clock pulse and a frequency proportional signal representative of the motor speed and a differential speed detecting circuit for outputting differential speed data between the length of the clock signal and the length of the speed signal. A pulse width modulated signal obtained from the two signals controls the speed of the motor.

REFERENCES:
patent: Re33500 (1990-12-01), Bisseling
patent: 4240014 (1980-12-01), Muller
patent: 4278925 (1981-07-01), Minakuchi
patent: 4348625 (1982-09-01), Sharp
patent: 4964117 (1990-10-01), Shier

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