Abstract
This paper presents an analytical model to calculate the d- and q-axis Inductance of dual three-phase surface-mounted permanent magnet motor accounting for eccentric pole and tooth saturation. The novel method combines the advantages of the subdomain model and lumped parameter magnetic circuit model. This motor is divided into several subdomains. And the eccentric pole is further subdivided into multiple symmetrical regions. Based on the Poisson’s and Laplace’s equations, the subdomain model is established. The reluctance of the tooth and the tip is calculated by the subdomain model and lumped parameter magnetic circuit model. According to the relationship between the tooth reluctance, tip reluctance and the corresponding air-gap reluctance, the equivalent air-gap magnetic density coefficient is obtained. Based on the coefficient, the new air-gap magnetic density and tooth magnetic density are solved. For the solution of saturation, this paper compares the density of two adjacent solutions until the error between the two is very small. Based on the iterative calculation, the d- and q-axis inductance is obtained. The finite element method and experiment are employed to validate the analytical model.
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