Comparison of power factor between permanent magnet assisted synchronous reluctance motor with neodymium-iron-boron and ferrite magnets

In this paper, the design of a permanent magnet assisted synchronous reluctance motor (PMASynRM or PMASRM) is presented as a replacement for a suitable permanent magnet in a simulated synchronous reluctance motor (synrm). In addition to solving the important problems faced by typical synchronous reluctance motors (low power factor and high torque ripple) it can provide more power of coping and then other common motors such as induction motors (IM). A common motor model was created for simulation in Maxwell finite element software. Then, ferrite and neodymium-iron-boron (NdFeB) magnets were compared as the permanent magnet The results show that the fields of average torque, Back-emf voltage and efficiency, and the torque ripple are all greater in the neodymium-iron-boron magnet than the ferrite magnet. Finally the power factors for both magnets are calculated from the power, voltage and current simulations as 0.68 in ferrite magnet and 0.89 in neodymium-iron-boron magnet. The results also indicated that a higher power factor in the second model than the first one.