Electromagnetic Characteristics Analysis of IPMSM for xEV Compressor using Vector Control

In general, interior permanent magnet synchronous motors are analyzed using the finite element method (FEM) by assuming that the input current is sinusoidal at a specific speed. However, in reality, it is operated through a drive system composed of a controller, compensator, and inverter. Therefore, the harmonic current is generated by an inverter that uses the pulse-width modulation method. The harmonic current increases the torque ripple and electromagnetic loss, and reduces the efficiency. Herein, the harmonic current is obtained from the simulation of a vector control system. Subsequently, FEM analysis was performed using the harmonic current, and the results were compared with those of a sinusoidal current.