Özet:

Brushless DC motors (BLDC) are widely used in variable speed drive applications. Nowadays the relationship between the number of poles, slots and winding arrangements in BLDC motors continues to be a very challenging topic. The main objective of this work was to develop and compare four-pole BLDC motors with different slot numbers (6, 12 and 15) and winding arrangements. Three-dimensional finite element analysis (FEA) was conducted to characterize the proposed designs. The Total Harmonic Distortion (THDv) which tells the amount of harmonics present in the voltage have been obtained and compared based on the different slot numbers and winding arrangement. In the study, an extensive investigation of the THDv values in four-pole BLDC motors having different slot and winding configurations has been carried out. From the simulated results it is evident that the lowest THDv and corresponding sinusoidal back emf can be obtained by implementing 15 slots within four-pole designs. The performance values have been examined comparatively by analysing the motors at the rated condition.

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