Research on Control Strategy in Electrical Drive

我们开展了电机控制方法的研究项目，主要成果如下：采用模型参考自适应系统理论，提出了转子电阻辨识的新方法。理论和实验均取得了较好的识别效果。为了提高无速度传感器矢量控制系统的稳定性，提出了一种新型的全阶观测器方案。通过建立系统的线性模型，设计了控制增益。采用基于DSP的变频器驱动系统进行了研究，计算结果与实验结果具有良好的相关性。研究了永磁同步电动机在极低速运行时的速度控制问题。此外，还实现了考虑磁链饱和的线性转矩控制。对“半波整流无刷同步电动机”的无位置传感器控制、“交流励磁无刷同步电动机”的电压矢量控制和“圆柱转子式开关磁阻电动机”的脉冲角控制进行了研究。这些特殊机器是我们提出的。提出了一种新型的直线电机燃油泵系统，并对其控制方法进行了研究。采用非线性规划技术对电机设计参数进行优化的方法由长崎大学提出，采用有限元分析与优化程序相结合的方法对电机结构进行优化的方法由拉奎拉大学提出。然后，将上述两种方法结合起来，提出了一种新的电机优化方法。本文对矩阵变换器的控制方法进行了研究，提出了一种新的控制策略，使输出电压达到电源电压的0.866倍，改进了输入电流波形，并提出了一种新的触发顺序来消除电压和电流尖峰。少

We have carried out the research project on control method of electric machines, Principal esults of this work are as follows ;1. We proposed new method of the rotor resistance identification by adapting the model reference adaptive system theory. Good results of the identification are obtained theoretically and exerimentally.2. In order to improve the stability of the vector control system without speed sensor, we proposed new type scheme in which a full order observer is developed. By deriving a linear model of the system, the control gains are designed. The DSP based inverter drive system is used for this study and good co-relation between the computed results and experimental ones is obtained.3. We studied the speed control at very low speed operation of the permanent magnet synchronous motor. Furthermore a linear torque control taking into account the saturation of flux is realized.4. We made research of position sensor less control for a "half-wave rectifid brushless synchronous … More motor", voltage vector control for an "ac-excited brushless synchronous motor" and pulse angle control for a "cylindrical-rotor type switched reluctance motor". These special machines were proposed by us. We also proposed a new type fuel pump system with linear motor and now investigate the control method.5. A method of optimizing the design parameters of the electric machines using nonlinear programming technique is developed by Nagasaki University and a method of optimizing the motor configuration using the finite element analysis combined with the optimization routine is developed by University of L'Aqila. Then, we proposed a new optimization method of the electric machine with comibining above two methods.6. We research on a control method for matrix converters, in which we proposed a novel control strategy to generate the output voltage of 0.866 times the supply voltage and improve the input current wave forms and a novel firing sequence to eliminate the voltage and current spikes. Less