According to indicators,a new V-rotor permanent magnet motor(NVRPM) for compressors with a rated power of 22 kW and a rated speed of 3 000 r/min was optimally designed.Considering that the large number of permanent magnet blocks in the V-rotor motor increases the magnetic leakage between rotor poles,and that the air gap magnetic field contains lots of harmonic components which is easy to increase the loss and reduce the efficiency,the optimization design of three structures was carried out on the initial V-rotor motor:adding multiple air slots on the rotor face,cosine type non-uniform air gap,segmented skew poles.Through finite element simulation of electromagnetic characteristics of NVRPM,calculating optimum skew pole angle,and analyzing the amplitude of cosine function in the non-uniform air gap,it is proved that the optimized NVRPM can reduce the loss by 22.6%,weaken the cogging torque by 98.2% and decrease the torque ripple by 11.7%.In addition,the experimental prototype was trial-produced and verified.Its test efficiency was as high as 96.32% and the operation area was wide and efficient.So the optimal design of NVRPM is practical and suitable for compressor production.