A Subdomain Model of Permanent Magnet Motors Considering Periodic/Half-periodic Boundary Conditions
In this paper,a subdomain model of surface-mounted permanent magnet motors considering periodic/half-periodic boundary conditions is proposed,which provides a fast and efficient tool for the design and optimization of large-capacity direct-drive multiphase permanent magnet propulsion motors used in ships.The principle and realization method of periodic boundary condition and half-periodic boundary condition are explained,and they are applied to the subdomain model based on equivalent surface currents to solve the air-gap magnetic field of the motor.The dimension and solving speed of the harmonic coefficient matrix in the subdomain model of the three solving domains are compared,indicating that the subdomain model considering the periodic/half-periodic boundary conditions can greatly reduce the matrix dimension and the solving time while ensuring the accuracy of the results.The no-load and loaded experiments are carried out.The experimental results of no-load back EMF and loaded torque are in good agreement with the analytical ones,which further illustrate the correctness of the subdomain model under the periodic/half-periodic boundary conditions.
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