Motor rotation speed controlling apparatus

Details Motor rotation speed controlling apparatus Motor rotation speed controlling apparatus

1988-01-19

1990-08-14

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

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

388910, 388915, H02P 500

Patent

active

049493930

ABSTRACT:
The present invention is directed to a motor rotation speed controlling apparatus including a comparator, a detecting circuit for detecting a feedback signal of a motor, a motor driving transistor, and a circuit for changing the level of a constant voltage fed to the comparator. The comparator compares a saw-tooth voltage with a constant voltage and outputs a signal which has a duty cycle corresponding to the result of the comparison. The motor driving transistor drives the motor in response to the output signal from the comparator. To change the duty cycle of the output signal from the comparator, a circuit is used that changes the level of the constant voltage in response to a feedback signal detected by the detecting circuit.

REFERENCES:
patent: 3890554 (1975-06-01), Yoshitake et al.
patent: 4034274 (1977-07-01), Akima
patent: 4177412 (1979-12-01), Minakuchi
patent: 4332208 (1982-06-01), Watasue et al.
patent: 4424470 (1984-01-01), Finch
patent: 4458183 (1984-07-01), Neilson

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