Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1981-05-28
1984-04-10
Truhe, J. V.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318803, 318809, H02P 534
Patent
active
044423942
ABSTRACT:
The invention relates to an inverter circuit for operating a speed-controllable asynchronous motor. The inverter circuit is of the type wherein the voltage and frequency are substantially proportional until the nominal frequency has been reached at nominal voltage. The circuit includes and inverter, a desired value control, a D.C. voltage supply with a voltage regulator which sets the voltage depending on the desired value, and a voltage-operated frequency regulator. The circuit can be operated at frequencies above the nominal frequency to avoid damage to the inverter which would otherwise be caused by (1) high voltage due to the motor operating as a generator or by (2) the rapid reduction of the speed setting controls which is not accompanied by a corresponding drop in the voltage supplied to the inverter.
REFERENCES:
patent: 4158163 (1979-06-01), Eriksen et al.
patent: 4230979 (1980-10-01), Espelage et al.
patent: 4274042 (1981-06-01), Walker et al.
patent: 4276505 (1981-06-01), Bose
patent: 4314190 (1982-02-01), Walker et al.
patent: 4317074 (1982-02-01), Erth
patent: 4320331 (1982-03-01), Plunkett
Beierholm Hans M.
Henriksen Niels J.
Danfoss A/S
Easton Wayne B.
Moose Richard M.
Truhe J. V.
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