Heating of induction cage machine supplied with voltage containing negative-sequence subharmonics

摘要

This work studies the influence of negative-sequence voltage subharmonics on an induction cage machine. The results of thermal tests are shown for subharmonics of various frequencies. Their effect on windings temperature rise is analysed. The influence of subharmonics on stator currents is presented. The differences in the impact of positive-sequence and negative-sequence subharmonics on an induction motor are discussed. The results of experimental investigations are presented for a 3-kW, totally-enclosed fan-cooled machine.