Current linkage harmonics and air-gap harmonic leakage inductance of tooth-coil permanent-magnet synchronous machines

This paper emphasizes the importance of current linkage harmonics for tooth-coil permanent magnet synchronous machines (TC-PMSMs). In the literature the importance of the current linkage harmonics for the design of TC-PMSMs has so far been underestimated. It is shown that the current linkage harmonics affect a lot the performance and efficiency of this type of machines. The torque capability and field-weakening capability strongly depend on the harmonic spectra of the current linkage waveform. Losses in a TC-PMSM are also dependent on the spectrum of the current linkage waveform of the selected slot-and-pole combination. This paper presents a thorough analysis of the influence of the current linkage harmonics on the synchronous inductance of TC-PMSMs.