Abstract
AbstractThe paper discusses the torque characteristics of spherical permanent magnetic (PM)motor adopting three-dimensional (3D)magnetic equivalent circuit(MEC). Taking into account the unsaturation of the magnetic field, the rotor and the stator are meshed in spherical coordinates and cylindrical coordinates respectively, and then the expressions of the reluctances and magnetomotive force(MMF) have been deduced. According to the relative position between the coordinate systems, the magnetic field in the air gap has been obtained by transforming the coordinate systems. Based on this, the Maxwell stress tensor(MST)method is applied to analyze the electromagnetic force and torque, the corresponding torque matrix is given, and the relationship between the motor torque and winding location is obtained. Compared with the finiteelement method(FEM), this method is proved to have a high accuracy and helpful to the optimization design of the PM spherical motor.KeywordsPM spherical motorElectromagnetic torqueMaxwell Stress Tensor3D Magnetic Equivalent Circuit
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