Apparatus for detecting the speed of an electric motor

Details Apparatus for detecting the speed of an electric motor Apparatus for detecting the speed of an electric motor

1979-01-29

1980-10-07

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318334, 318471, H02P 516

Patent

active

042271290

ABSTRACT:
Apparatus for detecting the speed of an electric motor that forms part of a web transport system employs a bridge circuit adapted to measure the back emf of the motor. Thermally induced changes to the armature resistance of the motor are compensated for by varying the bridge resistances, such changes being identified by comparing the bridge circuit signal output with a reference signal.

REFERENCES:
patent: 3475672 (1969-10-01), Oltendorf
patent: 3737751 (1973-06-01), Lima
patent: 3860361 (1975-01-01), Gucker

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