Evaluation of a permanent magnet synchronous machine with a rotor coil for improved self-sensing performance at low speed

In this paper, an interior permanent magnet synchronous machine with a damping coil in the rotor for improved self-sensing capabilities at low speed and standstill is evaluated. Methods for measuring the differential inductive and resistive anisotropies are discussed. The measured load characteristics of these anisotropies, the additional PR losses and the dynamic behaviour are analysed and discussed for a prototype machine. The results show that the anisotropy can be increased effectively in the entire load range. Additionally, the cross-coupling is reduced. Combining existing rotor position tracking methods with the presented motor concept is a very promising way to achieve both, good machine performance and competitive self-sensing capabilities even at full torque and overload.

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