Alternating-current machine drive

Details Alternating-current machine drive Alternating-current machine drive

H - Electricity

02

M

318/111

H02M 1/12 (2006.01) H02P 25/02 (2006.01)

Patent

CA 1218694

Abstract of the Disclosure 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 the 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 alter- nating current sinusoidal within a predeterminable frequency range. The frequency of the alternating cur- rent 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 within a relatively large frequency range.

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