Space Harmonics Modelling and Analysis of a 3 Phase Asymmetrical Unevenly Chorded Winding

By modifying the design specifications, a higher energy-efficiency can be attained and undesirable operational conditions within the induction motor can be mitigated. When analyzing motor design and torque generation mechanism, it becomes evident that, despite a sinusoidal supply voltage and frequency, variations occur at each angular position within the motor due to the influence of its geometric structure. This phenomenon, stemming from the distribution of windings, gives rise to a structural feature known as space harmonics. Previous studies showed that it is possible to reduce or eliminate, the disturbing effects of space harmonics by structural changes. This study focuses on the possibility of application of an asymmetrical spaced stator slots with chorded double-layer 3-phase winding which is open to accommodating different numbers of turns from different phases in the same slot. The calculations were performed and results are shared for the impact of slot and winding distribution on space harmonics.