Speed control system for small size D-C electric motor

Details Speed control system for small size D-C electric motor Speed control system for small size D-C electric motor

1978-05-11

1980-02-19

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318331, 318471, H02P 500

Patent

active

041896661

ABSTRACT:
A speed control system for a d-c electric motor comprising a three-terminal space control IC to provide a constant voltage source having a negative internal resistance equal in absolute value to the internal resistance of the motor and thereby render the motor rotatable at a constant controlled speed. A resistance element having a positive temperature coefficient is used as an external circuit element for the IC so that rotation speed variations relative to load torque variations will be substantially constant despite variations in the ambient temperature.

REFERENCES:
patent: 3705337 (1972-12-01), Grabl

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