Voltage Harmonics Impact on Line Start Permanent Magnet Synchronous Motor: A New Computational Method

Line start permanent magnet synchronous motor (LSPMSM) is a promising solution to reach IE4 super premium efficiency which also complies with the IEC standard frame. Voltage harmonics has been showing an ever-increasing trend in the power system grid for the past few decades. Input power consumption, losses, energy efficiency, and torque ripples in a motor are affected due to voltage harmonics. Hence, a study of voltage harmonics and their impact is essential to understand the loss characteristics and steady-state performance in LSPMSM. The losses identified in the existing literature are quite complex, and the effects of winding overhanging and skin effects are excluded in those studies. In this proposed work, a new computational method is developed to identify the various losses, efficiency, and temperature rise that are comprised of a combination of analytical calculation and finite element analysis (FEA). Stator copper loss and rotor copper loss are calculated from fast Fourier transform. The losses calculated from the proposed methodology are much closer to the prototype testing. Hence, the proposed method provides an opportunity for the designer to reduce the impact of voltage harmonics on LSPMSM during the design stage.