Development of a High Power Density In-Wheel Motor Using Halbach Array Magnets

In this study, a direct drive in-wheel system is proposed as high power density for reducing the intermediate parts, such speed reducer by increasing torque. We propose design strategy to show that multipolarization and improvement of gap magnetic flux can effectively increase density. A Halbach array magnet rotor combines main electrode magnets spoke with core adopted technique improving compare type conventional SPM using both circuit calculation FEM analysis. Moreover, actual sized motor prototype developed fabricated measures no-load induced back EMF. The measured EMF agrees well analyzed waveform.