LAUSR

Harmonic leakage inductance occupies a high proportion in the synchronous inductance of fractional slot concentrated winding permanent magnet synchronous motor (FSCW-PMSM), and the synchronous inductance determines the operating performance of the motor. To calculate the harmonic leakage inductance and synchronous inductance of the FSCW-PMSM fed by inverters, two-dimensional finite element analysis and the analytical method are used to study the influence of time-harmonic current on the harmonic leakage inductance of the three-phase FSCW-PMSM in this study, and the influence mechanism is revealed. The relationship between the time-harmonic magnetic field and space harmonic magnetic field is obtained, and the harmonic leakage coefficient and the working harmonic coefficient with different slot-pole combinations are investigated. The results show that the time-harmonic current can reduce the harmonic leakage inductance and increase the magnetising inductance, but has little effect on the synchronous inductance under the unsaturated condition. A prototype was manufactured and tested to verify the accuracy of the analysis model. The research results provide beneficial help for the design of the three-phase FSCW-PMSM fed by inverters.