Abstract
Power-efficient torque control of the Wound Rotor Synchronous Machine (WRSM) below base speed requires a minimization of electrical losses, namely copper losses. In this paper, the Maximum Torque per Ampere (MTPA) optimization problem is presented and solved using a convex pareto frontier of simulated or measured data points. Three filtered solution sets are mapped to current space using piecewise affine functions, which approximate the current using a piecewise linear function for a given torque. This set of piecewise linear functions enables a machine controller to implement MTPA online or as an offline lookup table. Simulated and experimental results are presented for a 65 kW, FEA-sampled WRSM. Compared to linear MTPA, the PWA MTPA functions are shown to reduce torque error by > 25%, reduce average copper loss by > 20%.
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