Analytical approach to cogging torque calculation of PM brushless motors

By J. Gieras. IEEE transactions on industry applications, 2004

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Analytical Solution for Cogging Torque in Surface Permanent-Magnet Motors Using Conformal Mapping (2008, methodology): “The analytical field solutions, which can be found in the literature [3], [5], [9], [13], [14], are able to provide fairly good estimates of only the radial component of flux density and, therefore, are not suitable for cogging torque calculation using Maxwell stress approach.”
Cogging Torque Reduction in Permanent Magnet Machines (2006, background): “The air-gap reluctance varies periodically, thus causing the cogging torque to be periodic [9].”
Force Calculations in 3-D Cylindrical Structures Using Fourier Analysis and the Maxwell Stress Tensor (2013, methodology): “In classical rotating or linear machines, the Maxwell stress tensor [20]–[22] as well as the virtual work method [23]–[25] are often used to calculate the cogging torque.”