Wpływ subharmonicznych i interharmonicznych napięcia na prądy w uzwojeniach silnika indukcyjnego

In power systems commonly appear various disturbances such as voltage unbalance, voltage deviations, frequency deviations (in autonomous power systems) and voltage waveform distortions. Voltage waveform distortions are usually associated with presence of higher harmonics. Also, in some power systems are appeared voltage components, which have frequency components higher than the fundamental frequency and are not an integer multiple of the fundamental one - called interharmonics. Sometimes interharmonics occur together with subharmonics, i.e. voltage components with frequency less than the fundamental one. Both interharmonics and subharmonics are the most seldom investigated power quality disturbances, and their impact on an induction machine is still not satisfactorily explained. This paper is devoted to the effect interharmonic and subharmonic voltage components on currents in windings of an induction machine. The results of experimental investigations are presented for two low-power induction cage machines.