H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/73
H02P 7/36 (1980.01)
Patent
CA 1150344
ENERGY ECONOMIZER FOR POLYPHASE INDUCTION MOTORS Abstract of the Disclosure 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 syn- chronous speed. This assures full starting torque and un- diminished overload handling capability. The triacs, in re- sponse 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 un- der 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 de- termines 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.
360214
Gowling Lafleur Henderson Llp
Parker Louis W.
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