Apparatus for supervising and controlling the output power of in

Details Apparatus for supervising and controlling the output power of in Apparatus for supervising and controlling the output power of in

1980-08-25

1982-07-20

Smith, Jr., David

Electricity: motive power systems

With signals, meters, recorders or testing devices

7386209, 324158MG, 340648, H02K 1100

Patent

active

043408478

ABSTRACT:
An apparatus for supervising and/or controlling the output power of an induction motor comprising means for generating a first voltage signal (Ha) which varies with the actual speed of the motor, means for generating a second voltage signal (S) corresponding to the synchronous speed of the motor, means for generating a third voltage signal (H) proportional to the speed of the motor at the rated maximum output, circuit means for generating voltage signals proportional to either S-H or S-Ha, a first meter responsive to the signal proportional to S-Ha for indicating the output power of the motor, a first voltage divider circuit coupled between the output of the circuit means for generating voltage signals proportional to S-H or S-Ha and the first meter to change the scale of the first meter, a second voltage divider circuit coupled to the output of the first voltage signal generating means and responsive to the frequency of the voltage source for the induction motor for producing an output voltage indicative of the actual speed of the motor in operation irrespective of the frequency of the voltage source, and a second meter responsive to the output voltage of the second voltage divider circuit.

REFERENCES:
patent: 2887654 (1959-05-01), Strassman
patent: 2938166 (1960-05-01), Hirsh
patent: 3573619 (1971-04-01), Ivec
patent: 4063112 (1977-12-01), Dumbeck
patent: 4091662 (1978-05-01), Emanuel
patent: 4141244 (1979-02-01), Dumbeck
patent: 4194129 (1980-03-01), Dumbeck

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