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This paper examines torque ripple, cogging torque, and radial forces in permanent magnet synchronous motors (PMSMs). Effect of slot number on electromagnetic torque (including cogging torque), and radial forces has been analyzed in different PMSM configurations having the same envelop dimensions and output requirements. Finite element technique is used for computation of the machine characteristics...
In this paper, we focus on the analytical calculation of the tangential forces that generate the armature and the cogging torque in brushless DC machines. We extend previously presented methods using conformal mapping to (i) avoid the singularity of the magnetic flux density at the tooth tip during the transformation and thereby overcome the limitations of this approach with respect to the calculation...
A fundamental disadvantage of 3-dimensional finite-element simulations is high computational cost when compared to 2-dimensional models. However, for 3-dimensional specific features full models are essential, in principle. An approach to avoid this necessity is the multi-slice method. It is a well known procedure to determine the torque of electrical machines with a skewed rotor only deploying slices...
An error estimation technique based on the L2 error norm is implemented in this paper for magnetostatic finite-element analysis. Convergence of both the global and local errors are used as indicators. The air gap is refined based on the rate of change in the calculated force and consists of layers. Results that highlight the accuracy of the combined methods for cogging torque calculations are displayed...
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