Speed control device for d-c motors

Details Speed control device for d-c motors Speed control device for d-c motors

1988-04-29

1989-05-16

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...

388824, 388902, 388930, 388934, 388935, H02P 500

Patent

active

048313122

ABSTRACT:
A speed control device for d-c motors includes an IC control circuit having such a construction that a reference voltage is generated across two of its terminals C and D. Additionally, a current proportional to the armature current of the d-c motor is kept flowing in the terminal D at all times. A transistor is connected across the terminals C and D of the control circuit so that motor revolution can be changed linearly by means of a variable resistor connected in parallel across the base and collector of the transistor. With this arrangement, the revolution of d-c motors can be accurately controlled.

REFERENCES:
patent: 4011491 (1977-03-01), Grover
patent: 4168455 (1978-09-01), Soeda

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