【作者】 杨凌志；

【导师】 熊光煜；

【作者基本信息】 太原理工大学 ， 电机与电器， 2004， 硕士

【摘要】 交流电机调速是一门综合性的学科，其中涉及到电力电子技术，自动控制，计算机，电机等方面的知识。高性能的交流调速系统实现很困难，这是因为交流电机是多变量、强耦合的非线性系统，不易实现高性能转矩控制。异步电机无速度传感器矢量控制增加了系统的简易性，矢量控制技术解决了交流电机电压的解耦与转矩控制问题，其基本思路是应用坐标变换将三相等效为二相，实现定子励磁电流分量与转矩电流分量之间的解耦，达到对交流电机磁链与电流分别控制的目的，交流电机等效为直流电机实现高性能调速。随着电力电子技术的进步，计算机技术飞跃发展，高度集成的专用模块和高精度的数字信号处理器应用于交流传动系统中，促进矢量控制技术的迅猛发展，日趋成熟。 当今，无速度传感器矢量控制是交流传动发展的主要方 太原理工大学硕士研究生学位论文向之一。显然，增加速度传感器，使系统可靠性降低，成本增加，环境适应能力降低。因此，无速度传感器矢量控制技术受到众多学者关注。无速度传感器矢量控制中，最关键的问题是如何进行速度推算和转子磁链估计。基于定子电流转矩分量进行速度推算[3]，基于转子磁链q轴分量进行速度推算[27]，使速度推算精度得到较大提高。 本文首先介绍了交流传动的发展现状，接着阐述矢量控制基本原理、坐标变换和异步电机在不同坐标系下的数学模型[sl[27]，深入研究了基于定子电流转矩分量进行速度推算[3]及基于转子磁链q轴分量进行速度推算[27]两种速度推算办法，对电压解祸环节进行了修正，在基于转子磁链q轴分量进行速度推算[27]调速系统中增加了磁链闭环部分。在此理论基础上，设计了无速度传感器矢量控制系统仿真图，应用电压控制理论，进行了控制系统动态仿真，并对结果进行理论分析，通过仿真结果验证了修正环节的有效性和正确性，电机调速特性有所提高。更多还原

【Abstract】 The AC motor speed controlling is a complex subject, it includes the knowledge of many other subjects such as the electric and electronic technology, the control engineer, the computer and the induction motor etc. The realization of the good performance AC control system is a hard work. This is because the AC motor is a strongly-coupled nonlinear system with many variables. The torque is not easy to control either. The method of the rotor flux position checking improves greatly the development of motor control system. The induction motor speed-sensorless FOC system makes it much easier to control the system. The FOC control theory realizesthe decoupling of the stator voltage and the torque control. The basic idea is using the coordinate transformation to change the three-Phase system to the two-Phase system and it realizes the decoupling between field current and torque current of the stator current. The method makes it possible to control the flux and current respectively, just like the DC motor. With the development of the electric and electronic technology and the development of computer, high-integrated special modules and high-precision digital signal processor(DSP)are applied to AC drive so that vector control has been developed rapidly.Now, the speed-sensorless FOC is one of the most important developing directions of the motor control system. The FOC control needs to get the accurate position of the rotor flux. It is always through the speed sensor. But if we do that it will result in the degrading of the credibility and adaptability and cost increasing of the control system. So many scholars have paid much attention to the speed-sensorless FOC control method. The speed and flux checking is the key problem. Inthis article, we calculate the speed by using the stator flux searching and improved the result precision.In this article, first we introduce the now state of the motor control development. Then we induce the basic theory of the coordinate transformation. And based on it, we designed an mathematic model by using MATLAB/SIMULINK.更多还原