Study on High performance Direct Torque Control of Switched Reluctance motor

研究了适用于感应电机和无刷直流电机驱动的高性能开关磁阻电机直接转矩控制方法。由于开关磁阻电机的转矩不像感应电机和无刷直流电机那样简单地与电机的磁通成正比，现有的研究方法不能简单地推广到开关磁阻电机。本文的目的是开发一种适用于开关磁阻电机的转矩直接控制方法，并将其应用于减小开关磁阻电机的转矩脉动问题。1)从开关磁阻电机直接转矩控制的原理出发，从理论上分析了开关磁阻电机直接转矩控制的物理意义。这些重要的知识有助于直观地理解驱动原理，也有助于提出一些新的驱动方法。2)利用MALAB/Si…建立了仿真模型更多的Mulink软件，以检验上述研究的结果。在仿真模型的基础上，对不同的直接转矩控制方法进行了验证，以减小转矩脉动。3)搭建了实验装置，将本文提出的方法成功地应用于开关磁阻电机的直接转矩控制。4)速度控制在电机驱动中非常重要，但开关磁阻电机的速度指令与磁链之间的关系并不明确。根据电机的磁特性，找出了速度指令与磁链的关系表，利用该表可以很好地实现大范围的速度控制。5)研究了无速度传感器控制方法。即使直接转矩控制技术在原理上也不需要位置或速度传感器，但在电机的速度控制系统中，通常需要速度传感器。我们注意到，在直接转矩控制技术中，旋转的磁通矢量是必不可少的，并且旋转的磁通矢量的角度与电机转子的位置非常相似，因为开关磁阻电机是同步电机。这些研究为今后的工作提供了有用的信息。较少

We studied about the high performance drive method of switched reluctance motors using direct torque control technique that is useful in the driving of induction motors and blushless DC motors. Because the torque of switched reluctance motors is not simply proportion to the motor's flux that contrary on the case of induction motors and blushless DC motors, existing methods used in such motors can not be simply extended to switched reluctance motors. Our purpose is to develop a torque direct control method that is suitable for switched reluctance motors, and then use the method to reduce the torque ripple problem of switched reluctance motors.1) We studied from the principle of direct torque control about switched reluctance motors, not only from theoretic analysis, but fined out the physical meaning. Such important knowledge are helpful for intuitively understand of the principle, as well as useful for proposing some new driving methods.2) We construct a simulation model using Malab/Si … More mulink software in order to exam the results of above studies. Based on the simulation model, we can testify different direct torque control methods in order to reduce the torque ripple.3) An experimental set has been made, using our proposed method we have succeeded for the direct torque control of switched reluctance motors. Using the torque meter equipment that is required in our proposal, we find out that the torque ripple waveform is reduced clearly.4) Speed control is very important in the drive of motors, but the relationship of speed command and flux in switched reluctance motors is not clear. We find out a table to express the relation of speed command and flux based on the magnetic characteristic of motors, sing the table, a wide rang of speed can be controlled very well.5) We studied about speed sensorless control method. Even the direct torque control technique dose not necessary position or speed sensor in principle, but in the speed control system of motors, the speed sensor is usual needed. We notice that the rotated flux vector is necessary in direct torque control technique, and the angel of the rotated flux vector is very similar to the position of the motor's rotor because switched reluctance motors are synchronous machines. These studies provide useful information for the future works. Less