Determining asynchronous motor couple

Details Determining asynchronous motor couple Determining asynchronous motor couple

1980-12-05

1983-12-06

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324158MG, 361 23, G01R 2100, G01R 3100

Patent

active

044196253

ABSTRACT:
A device determines the mean power absorbed from a current supply by measuring the current in a phase, and the voltage between two phases, determining the product thereof, and integrating the product.
A first potentiometer provides a proportion of the voltage which is an image of the current, and subtracts it from that voltage between phases. A second potentiometer provides a proportion of the voltage between phases and subtracts if from the product. A third potentiometer provides a proportion of a constant voltage and subtracts it from that product. The third potentiometer is adjusted so that the output power of the integrator shall be zero when the motor rotates under no-load condition.

REFERENCES:
patent: 2448533 (1948-09-01), Laurance

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