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This paper aims to examine the quality of forces calculated analytically in comparison to those simulated using the
finite element method (FEM). The study focuses on various wound-rotor synchronous machines, covering different stator slot
opening designs and the presence of ferromagnetic wedges. The results demonstrate that the simulated forces can be reliably
predicted using analytical expressions in conjunction with empirically derived correction factors. These correction factors are
specific to two distinct stator tooth geometries and remain valid across a broad range of load conditions. Additionally, the
influence of rotor topology on the correction factors is examined, considering a cylindrical rotor and two salient-pole rotor
designs: one with an arc-shaped pole shoe and the other with a trapezoidal pole shoe. The results indicate that the correction
factor exhibits minimal variation across different rotor topologies. The influence of stator tooth design on electromagnetic force
characteristics is further illustrated through time-domain force waveforms and their corresponding harmonic spectra,
highlighting the role of slot geometry in shaping the electromagnetic force profile.
Wound-rotor synchronous machine, Force calculation, Forces on stator teeth, FEM, Analytical method
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