Electricity: motive power systems – Induction motor systems – Power-factor control
Patent
1979-05-04
1980-12-30
Rubinson, Gene Z.
Electricity: motive power systems
Induction motor systems
Power-factor control
318800, 318812, H02P 736
Patent
active
042426251
ABSTRACT:
A standard three phase induction motor starts with all three of its input connections connected to the three phase power line. Two of these connections are through triacs which remain continously conducting below said motor's particular most energy-efficient speed, which is above about 95% of synchronous speed. This assures full starting torque and undiminished overload handling capability. The triacs, in response to a control signal, may open the circuits over a sufficiently wide portion of the sine wave input voltage to substantially maintain said particular efficient speed under all rated load conditions. To assure smooth operation and maximum energy savings, the two triacs conduct differently at very light motor loads. The DC control voltage which determines the operation of the triacs is generated by a frequency discriminator circuit which receives its information from a load detecting device that is frequency modulated by load/speed related properties inherent to induction motors.
REFERENCES:
patent: 3470436 (1969-09-01), Steele
patent: 4052648 (1977-10-01), Nola
patent: 4176307 (1979-11-01), Parker
patent: 4190793 (1980-02-01), Parker et al.
Parker Louis W.
Rubinson Gene Z.
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