Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1984-07-10
1986-11-18
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318806, 363 39, 307105, H02P 540
Patent
active
046238301
ABSTRACT:
In this context, a frequency converter generates a multiphase alternating current of variable frequency which current feeds an alternating-current machine via alternating-current lines into which for each alternating current phase line one commutating choke is integrated for limiting the change of current with respect to time di/dt. Since the efficiency of a synchronous motor is best when fed with a sinusoidal alternating current, a frequency-variable filter is provided as a bypass circuit to the synchronous motor which makes the alternating current sinusoidal within a predeterminable frequency range. The frequency of the alternating current is measured with a frequency meter and monitored for exceeding a limit in a frequency limit detector. The filter can be tuned step-by-step by means of switching signals to different frequencies by changing the inductance or capacitance of series-tuned circuits step-by-step. Undesirable harmonic frequencies can thus be attenuated with-in a relatively large frequency range.
REFERENCES:
patent: 2241832 (1941-05-01), Wahlquist
patent: 3395327 (1968-07-01), Kaiser et al.
patent: 3501686 (1970-03-01), Tveteras et al.
patent: 3555291 (1971-01-01), Dewey
patent: 3859542 (1975-01-01), Kennedy
patent: 3881137 (1975-04-01), Thanawala
patent: 4039926 (1977-08-01), Steigerwald
patent: 4308575 (1981-12-01), Mase
patent: 4355241 (1982-10-01), Hingorani
Peneder Franz
Suchanek Vojen
BBC Brown Boveri & Company Limited
Smith Jr. David
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