Inverter-motor system with different control characteristics for

Details Inverter-motor system with different control characteristics for Inverter-motor system with different control characteristics for

1979-09-12

1982-02-23

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318729, 318798, H02P 534

Patent

active

043170749

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.

REFERENCES:
patent: 3394297 (1968-07-01), Risberg
patent: 3403318 (1968-09-01), Krauthamer et al.
patent: 3584279 (1971-06-01), Krauthamer

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