Fast Response AC Servo System using a Novel Flux Observer

本课题的研究目的是利用状态观测器来改善交流伺服系统的性能。首先，本文介绍了感应电机在连续时域内的线性状态方程，并在此基础上设计了Gopinath型磁链观测器。其次，我们推广了观测器的设计方法，发现可以得到十种观测器。他们被分为四组。本计画的另一个目的是实现实际的控制系统。我们利用M-G装置构建了由被测感应电机和负载侧直流电机组成的实验系统。感应电机由功率晶体管PWM逆变器驱动。将磁链观测器解释到离散时间域，并在微机系统中实现对二次磁链分量的估计。我们从估计的角度证实了观测器的优良性能。 ...更多信息 离子速度和估计误差。本文还提出了单采样延迟的补偿方法，这对今后控制系统的开发具有一定的参考价值。在此基础上，提出了利用二次电流测量磁链真分量的方法。针对产生大转动惯量的负载模拟器，讨论了减小观测器对电机参数变化敏感性的方法，提出了描述敏感性的结构不稳定性指标。结果表明，在基于磁链观测器的矢量控制系统中，磁链相位反馈方法是最有效的，但目前的控制系统计算周期长，这对整个控制系统的构建是一个致命的困难。我们计划设计一个高性能的控制系统，使用DSP（数字信号处理器）。我们也将介绍一个加速度控制伺服系统，我们最近提出的伺服机构的一个新的设计概念。少

The aim of this project is to improve the performance of AC servo system by using a state ovserver.First, we introduced the linear state equations of induction machine in the continuous time domain and designed the Gopinath type flux observer based on them. Next, we generalized the design method of the observers and found that ten kinds of observers can be obtained. They are categorized to four groups. The effectiveness of these theoretical developments were confirmed through some simulations.Another aim of the project is to realize the actual control system. We constructed the experimental system using M-G set consisting of the tested induction machine and the loadside DC machine. The induction machine was driven by the power transistor PWM inverter. The flux observer which was interpreted to the discrete time domain and implimented in the microprocessor system estimated the secondary flux components. We confirmed the excellent performances of the observer in the viewpoints of estimat … More ion speed and the estimation error. We also developed the compensation method of the one sample delay, which will be useful for the future control system development. Further, we developed the measuring method of the true flux components using secondary current. The load simulator was developed which generate a large inertia moment.We discussed the method of reducing the sensitivity of the observer to the motor parameter variation, and proposed the structural instability index which describes the sensitivity. We showed that the flux phase feedback method is most effective in the vector control system based on the proposed flux observer.Finally, we found that the present control system requires long calculation period, which has a fatal difficuity in the construction of the whole control system. We plan to design a high performance control system using DSP (Digital Signal Processor). We are also going to introduce an acceleration control servo system which we proposed recently as a novel design concept of servo mechanism. Less