The design and comparison of three permanent magnet motors for a constant power of 45 kW at 1 000 rot/min rated speed, and 3 000 rot/min maximum speed, with concentrated windings and different kinds of water jacket cooled stator and PM rotor is presented. Motor A and motor B have surface mounted magnets and equal tooth widths with coils wound on each tooth, but different number of stator slots, while motor C has buried magnets and unequal tooth widths and coils wound on each second tooth. The simulation results show that motor A has the smallest current rating and the highest power factor but has the biggest cogging torque and torque ripple at load. Motor B produces the smoothest torque and smallest cogging torque but also the highest total losses. Motor C yields the lowest total losses and has the better thermal behavior but has the lowest power factor and the highest current rating.

Keywords: Synchronous motor, Permanent magnet, Concentrated winding.