CONTRIBUTION OF SPATIAL HARMONICS AND TOOTH PULSATION IN IRON LOSS OF POLYPHASE INDUCTION MOTOR

Vinay Jaiswal

Keywords

Iron loss, spatial harmonics, squirrel cage, threephase induction motor

Abstract

The contribution of spatial harmonics and tooth pulsation in iron loss of three-phase squirrel-cage induction motor (IM) has been calculated using lumped circuit approach. An equivalent circuit considering spatial harmonics has been used for the same. An empirical formula has been developed and validated for tooth pulsation loss. Iron loss due to fundamental, spatial harmonics components and tooth pulsation has been determined and compared with experimental results. It is found that the iron loss due to stator spatial harmonics is in the same range as that due to fundamental component, the tooth pulsation loss is in the range of 25–35% for 2-pole and 20–30% of total iron loss for 4-pole IMs. The percentage errors between computed and average experimental results for total iron losses are within acceptable limits (±5%) without taking too much of computation time compared to the numerical methods.

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