Mathematical Modeling, Finite Element Analysis, and Experimental Verification of Cross-Coupled 2-DOF Tubular SPMSM

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This paper proposes a cross-coupled two-degree-of-freedom (2-DOF) tubular surface permanent magnet synchronous motor (SPMSM). In the proposed motor, the stator part consists of two bobbins with helical three-phase windings. The mover part is a shaft on which the segment permanent magnets are pasted in the checkered pattern. As a result, two orthogonal Lorentz forces in helical directions can be generated. The thrust force can be controlled as a sum and the rotational torque can be controlled as difference. This implies that the proposed motor has modal decomposition function of common mode and differential mode as a distinctive feature of its structure. This paper establishes the mathematical modeling of the proposed motor to represent the motion principle. The finite element analysis (FEA) results show the adequacy of the established theory. Moreover, the utility of the proposed motor is verified through experimental results obtained from prototype.