IMPROVED PERFORMANCES OF IPM MOTORS WITH TYPES OF DOUBLE V AND DELTA MAGNETS BY USING HIGH FLUX DENSITY MATERIALS

Abstract

The magnetic material has a big influence on the magnetic flux density in airgap of double V and delta
magnets of IPM motors. Many papers used different materials to raise tthe performances of this machine such
as materials of 35JN250, 35JNP5 and 50JNP7. In this paper, the material of Cobalt Steel-VaCoFlux with a high
magnetic flux density is proposed for types of double V and delta magnets in the rotor to improve the
efficiency of IPM motor. Two types of motor of 36 slots/6 poles with the slot fill winding and 72 slots/6 poles
with the hairpin winding are presented to investigate the electromagnetic torque, efficiency, back
electromotive force and magnetic flux density with different magnetic materials such as the silicon steel of
M350-35A and VaCoFlux 50-0.35. The arrangement designs of the double V and delta magnets are also
compared to evaluate and analyse the efficiency, torque and thermal. In addition, to improve the cogging
torque due to the number of stators or slots, the step skew rotor slices are also arranged with different
skewing angles to minimize the torque ripple. Finally, the cogging torque values and temperature distribution
of two motors will be compared and discussed to see validation of a good agreement.