AC Losses in Form-Wound Coils of Surface Mounted Permanent Magnet Vernier Machines

Surface mounted permanent magnet Vernier (SPM-V) machines, because of their high torque density and multi-pole structure, are promising candidates for low-speed direct-drive applications. To achieve density, the SPM-V machines generally designed with gear ratios. Therefore, operating frequencies can be much higher than those conventional SPM machines. This potentially increases alternating current (AC) winding losses, especially form-wound coils proposed high-power article investigates AC losses (including skin effect, proximity rotor PM induced, circulating losses) in stator a 3 MW machine different slot/pole number combinations. The study reveals that have significantly counterparts similar conditions. reduce novel flux shunt concept is along other techniques such as increasing turns/coil (with terminal voltage being kept constant) parallel strands/turn, providing extra clearance at slot opening. With loss reduction implemented, comparable efficiency but counterparts. Moreover, was also found to very effective reducing potential risk (PM) irreversible demagnetization, key issue power ratings.