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DEVELOPMENT OF BRUSHLESS AC MOTOR CONTROL ALGORITHMS FOR EPS APPLICATION

机译：EPS应用的无刷交流电机控制算法的开发

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摘要

This paper describes a torque controller design method of brushless AC (BLAC) motor for electric power steering (EPS) system. Especially, this paper is focused on two types of advanced control methods that can be used in reducing torque ripples and in extending the operational region of the BLAC motor. A motor torque ripple compensation algorithm is proposed to improve steering feel of the objective EPS system at regions which require lower speed and higher torque assistance characteristics. The algorithm compensates bad effects of asymmetric back electromotive force (BEMF). The instantaneous electrical angle, compensator gain and delay factor of sinusoidal function are utilized in the algorithm. A flux weakening algorithm is also applied to reduce the catch-up phenomenon that occurred frequently in EPS systems under rapid steering conditions. The applied algorithm uses the differences of dq-axis voltages between the controller outputs and the saturated voltages. So it doesn't need to establish any complicated flux weakening table which conventional algorithms uses. Finally, we propose a torque controller of the BLAC motor for the EPS system. The controller described in this paper can be easily implemented in software and no additional hardware or sensor is needed. The feasibility of the controller has been verified by simulations and experimental results on laboratory and entry level compact car. The results show satisfactory performance of the torque controller in applying to the EPS system.
机译：本文介绍了一种用于电动转向（EPS）系统的无刷AC（BLAC）电机的扭矩控制器设计方法。特别是，本文集中于两种类型的先进控制方法，可用于减小扭矩涟漪和延伸布拉克电动机的操作区域。提出了一种电动机扭矩脉动补偿算法，以改善需要较低速度和更高扭矩辅助特性的区域的目标EPS系统的转向感。该算法补偿了不对称背电动势（BEMF）的不良影响。算法中利用正弦函数的瞬时电角度，补偿器增益和延迟因子。磁通弱化算法也被应用于减少在快速转向条件下在EPS系统中经常发生的追赶现象。应用的算法使用控制器输出和饱和电压之间的DQ轴电压的差异。因此，不需要建立传统算法使用的任何复杂的磁通弱化表。最后，我们提出了一种用于EPS系统的BLAC电动机的扭矩控制器。本文描述的控制器可以在软件中容易地实现，并且不需要额外的硬件或传感器。通过模拟和实验室和进入水平紧凑型汽车的模拟和实验结果验证了控制器的可行性。结果显示了扭矩控制器在施加到EPS系统时的令人满意的性能。

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