Flux-weakening and output power capability estimation of the four-pole interior permanent magnet synchronous motor (IPMSM) determined from the finite element method (FEM) analysis of magnetic conditions is presented. The influence of the iron loss on the output power capability (OPC) and the constant-power speed range (CPSR) of the tested IPMSM is included in the analysis by the posterior iron loss calculation. Results of the calculations are partially verified by the measurements.
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