Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1981-06-12
1984-06-19
Rubinson, G. Z.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318812, 318786, H02P 736
Patent
active
044555210
ABSTRACT:
A circuit is disclosed for controlling operation of a single phase electric motor to obtain maximum efficiency over a complete range of load conditions for the motor. Under conditions of less than full load, single phase motors waste electricity when full AC power is continuously supplied thereto. At less than full load, the torque requirements of a motor are reduced and therefore the flux can be reduced, thus increasing the efficiency. An electrical switch, in electrical series with the motor, is used to control the motor flux by reducing the "on time" of the switch and thereby decreasing the voltage applied to the motor. The ratio of auxiliary winding voltage to main winding voltage is the parameter used in the instant invention to provide a measure of the load condition of the motor and thus operate the electrical switch.
REFERENCES:
patent: 3441823 (1969-04-01), Schlabach
patent: 3855509 (1974-12-01), Wright
patent: 4041395 (1977-08-01), Hill
patent: 4091662 (1978-05-01), Emanuel
patent: 4162435 (1979-07-01), Wright
patent: 4176307 (1979-11-01), Parker
patent: 4238717 (1980-12-01), Knight et al.
patent: 4378520 (1983-03-01), Ford
"Power Factor Controller"; NASA; George C. Marshall Flight Center, Marshall Space Flight Center, Alabama; Apr. 2, 1979; pp. 11-13.
Day Alvin L.
Jordan Howard E.
Keane Patrick
Reliance Electric Company
Rubinson G. Z.
Stanley Ronald R.
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