Design and FEM validation for an axial Single Stator Dual Rotor PMSM

A novel synchronous machine-the single stator dual PM rotor brushless, axial-flux, concentrated double layer fractional tooth winding, single inverter with dual frequency PWM independent control for two shafts - has been proven in previous papers of these authors to be able to improve the machine efficiency and boost the torque density. This paper will present the key design equations and design procedure of the Single Stator Dual Rotor PMSM by the equivalent magnetic circuit method, analyze skewed PM angle effects on machine performance and give design guidelines to achieve specific design objectives. A quasi-3D finite-element analysis with specialized software is given to prove the effectiveness of the design equations and find the main characteristics of the machine.