Analysis and Implementation of a 3-DOF Deflection-Type PM Motor

This paper proposes a new 3-DOF deflection-type permanent magnet (PM) motor with three-layer rotor and stator structure. Based on the analytical approach, the distribution of the magnetic field and torque of the proposed PM motor is analyzed and calculated by solving the Laplace equation in the spherical coordinates and the Lorentz force equation, respectively. With 3-D finite-element analysis, different magneto motive forces´ effects on the torque characteristics are discussed. A prototype motor has been implemented based on the analysis and design. The theoretical analysis of the magnetic field and the back electromotive force model of the rotor has been validated by the experiments on the prototype motor. The results verify the effectiveness of the theoretical analysis and the accuracy of the developed model.