In a multiple-pole and high-power PMSTM with high fundamental frequency, the harmonic frequency of the internal magnetic field increases accordingly.The harmonic magnetic field will induce eddy current in the winding, resulting in high-frequency eddy read more current loss,, which will cause additional copper loss to be greatly increased, and should not be ignored in the design process.AC winding loss is the sum of DC winding loss and eddy current loss.
The sources, calculation methods and influencing factors of AC winding loss of PMSTM with high frequency and power were studied.A detailed FEA model of an 8-pole 675 kW high-frequency PMSTM was established.The influence of stator slot opening sensory play depth, winding conductor parallel number, rotor rotating magnetic field and time harmonic of input current on AC winding loss were analyzed.
The calculation results show that the harmonic magnetic field has the greatest influence on the conductor current density distribution near the slot opening; Optimizing the slot opening depth and winding conductor parallel number can effectively reduce the eddy current loss of the winding, minimize AC winding loss, and improve the efficiency of PMSTM.