Parameter Measurements with Unknown Input Observer for IPMSM Position Sensorless Control Based on Maximum Torque Control Frame

概要

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This paper proposes a parameter measurement method for interior permanent magnet synchronous motors that uses an unknown input observer for maximum-torque-control-frame-based position sensorless control. In position sensorless control, accurate motor parameters are required for rotor position estimation. Hence, these parameters need to be tuned in prior to the realization of position sensorless vector control. Generally, the mathematical model in the d-q axes needs to hold for the parameter measurement. This model in the d-q axes cannot hold, however, since accurate position estimation is impossible even if any pre-proposed position observers with inaccurate parameters are applied. The authors have already proposed a rotor position estimation method that uses an unknown input observer, which can help to realize significant robustness with respect to parameter mismatches. This paper proposes a parameter measurement method with assistance of the robustness of the unknown input observer of the previously proposed method. Finally, some experimental results demonstrate the feasibility and effectiveness of the proposed method in terms of maximum torque development.