H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/103
H02P 23/00 (2006.01)
Patent
CA 1173495
IMPROVED ENERGY ECONOMIZER FOR INDUCTION MOTORS Abstract of the Disclosure A standard, unmodified AC induction motor has its stator winding energized from a sine wave source through. a signal-responsive wave modifier operative to control the portion of each cycle of the sine wave which is coupled from said source to the stator winding. A motor current demodula- tor, responsive to efficiency-related parameters of the inrush current to the stator winding each time the current in the stator winding increases from zero, produces a control signal for the wave modifier, which signal varies with a decrease in motor operating efficiency below the maximum inherent efficiency of the motor to increase the field den- sity of the stator winding in response to increases in motor load and to decrease said stator field density in response to decreases in said load and/or to maintain the most energy- efficient stator field density at rated motor loads when the voltage magnitude of the sine wave source increases or de- creases from its nominally rated magnitude.
380119
Gowling Lafleur Henderson Llp
Parker Louis W.
LandOfFree
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