H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/108
H02P 27/06 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1160280
Abstract An inverter-motor combination is regulated in accordance with this invention to minimize deterioration of the power factor as the inverter is reduced from 100% load. This is accomplished by sensing the motor current and providing a control signal to regulate the inverter output frequency in accordance with a first function, representing virtually linear decrease in frequency as the load is reduced from 100% to substantially 70% of full load. A constant voltage stage is connected to regulate the d-c bus controller to provide a modified control signal for regulating the d-c bus level according to a second function, maintaining the d-c bus voltage at virtually 100% while the load is reduced to 70%. Thus the d-c bridge is not phased back and the power factor of the complete system is not degraded over this described operating range. This invention differs from earlier systems in that as the motor speed is reduced below base speed or 100% load, the frequency of the inverter output voltage is reduced but the amplitude of this voltage remains substantially constant in the region from about 70% load to 100% load.
358474
Borg-Warner Corporation
Macrae & Co.
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