Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-11-30
1984-03-13
Rubinson, G. Z.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318803, 318807, H02P 742
Patent
active
044370504
ABSTRACT:
Stabilized operation of an inverter and an a-c motor, driven by the inverter, is obtained in the presence of sudden undesired load changes by controlling the inverter so that both the amplitude and frequency of the inverter output a-c voltage will be functions of, and will vary directly with, the d-c bus voltage, with the result that anytime an abrupt abnormal load change causes the d-c bus voltage to vary, a frequency change occurs to compensate for the load change and to stabilize the bus voltage. By employing the d-c bus voltage to regulate the inverter frequency, if there is a sudden decrease, for example, in the mechanical load on the motor, the d-c bus voltage, which will tend to increase, causes the frequency of the inverter output voltage to increase, thereby increasing the motor speed so that the electrical load change across the d-c bus is reduced. As a result, the d-c bus voltage tends to remain relatively constant in spite of the abrupt mechanical load change. When there is a normal variation in load demand, necessitating a different steady state motor speed, a set point or reference voltage may be adjusted to change the amplitude and frequency of the inverter output voltage to the levels needed to drive the motor at the new required speed.
REFERENCES:
patent: 3546551 (1970-12-01), Risberg et al.
patent: 4158163 (1979-06-01), Eriksen et al.
patent: 4274042 (1981-06-01), Walker et al.
patent: 4280085 (1981-07-01), Cutler et al.
patent: 4281276 (1981-07-01), Cutler et al.
patent: 4291264 (1981-09-01), Siemon
"Volts/Hertz Control-Induction Machines" -K. Fukazawa et al., 1 AS 1981 IEEE pp. 619-627.
Borg-Warner Corporation
Moose Richard M.
Rubinson G. Z.
Tracy James E.
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