Abstract
Most of the motors used in industrial fields are interior permanent magnet synchronous motors (IPMSMs). The rotor structure of IPMSM is complex, and the rotor bridge region is affected by non-linear saturation, which increases the difficulty of modelling and calculation. The accuracy of traditional methods for the magnetic field prediction needs to be improved. An analytical model for IPMSM that accounts for the bridge saturation and the complex rotor structure is presented. This method transformed the structure of IPMSM equivalently, which makes it easier to use modelling in the polar coordinate system. Meanwhile, the bridge subdomain and the bridge saturation overflow subdomain are established separately based on the different saturation levels, and the relative permeability value of each subdomain is solved by the iterative permeability method. The magnetic field and electromagnetic performance obtained using the analytical method are compared with those of the finite element method. Finally, the analytical predictions are compared with the measured data to confirm the validity of the methods proposed.
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