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Optimization of maximum torque output in the wide speed range of a PMSM traction control system

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Abstract

This paper introduces a permanent magnet synchronous motor maximum torque control method for the wide speed range of a traction control system. This method tracks the maximum torque per ampere operating point and generates a d-axis current command according to the injection of a high-frequency angle signal to the current. This method is parameter independent when looking for the maximum torque per ampere operating point. By not injecting any real signal to a permanent magnet synchronous motor, this method does not increase the amount of copper and iron losses resulting from real signal injection. To obtain a maximum torque output in a wide speed range, this method considers the maximum amplitude limits of voltage and current when the traction motor runs in a flux weakening control field. This method is also robust to current and voltage harmonics, speed mutations, and torque disturbances. Experiment and analysis are conducted on a permanent magnet synchronous motor traction control system prototype under various operating conditions to verify the effectiveness of this method.

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Correspondence to Jilong Liu.

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Zhang, W., Xiao, F., Liu, J. et al. Optimization of maximum torque output in the wide speed range of a PMSM traction control system. J. Power Electron. 20, 152–162 (2020). https://doi.org/10.1007/s43236-019-00008-3

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  • DOI: https://doi.org/10.1007/s43236-019-00008-3

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