【作者】 刘瑞友；

【导师】 林忠岳；

【作者基本信息】 广西大学 ， 控制理论与控制工程， 2003， 硕士

【摘要】 直接转矩控制是一种转矩响应快的高性能的交流调速方法。本文采用TI公司TMS320F240 DSP为控制核心，进行了基于DSP无速度传感器直接转矩控制系统的研究。 本文详细阐述了直接转矩控制的基本原理和实现方法。直接转矩控制采用空间矢量的概念来分析异步电机的数学模型和控制其各物理量，直接在定子坐标系中计算和控制转矩和磁通，借助于离散的两点式调节 (Bang-Bang控制)产生PWM信号，直接对逆变器的开关状态进行优化控制，以获得转矩的高动态性能。本文采用DSP设计了直接转矩控制系统，详细推导了速度估计方法，进行了无速度传感器的速度闭环控制。针对系统存在的磁链偏差和转矩脉动问题，采取了改进的磁链计算方法和速度低通滤波、转矩滑动滤波等措施，提高了系统的性能。 在TMS320F240为核心的硬件基础上，采用汇编语言编制了系统控制软件，实现了无速度传感器直接转矩控制算法。实验结果表明本系统的设计是成功的，该系统转矩响应快，性能稳定，具有一定的实用价值。更多还原

【Abstract】 Direct Torque Control (DTC) technology is a high-performance adjustable speed method with fast torque response. In this thesis, a speed sensorless DTC system is studied, which based on DSP of TI inc.-TMS320F240 .Fundamental principle and implementation method of DTC are introduced in detail in this paper. In DTC system, the concept of space vector is introduced to analyze and control the AC motor, the electromagnetic torque and flux are caculated and controlled in the stator reference frame, and the optimal PWM gating signas are generated to control the inverter according to the output of the Bang-Bang regulator.In this paper ,the DTC system is designed based on DSP.A speed estimation method is derived detailedly and the sensorless speed close-loop control is conducted.In this system,there are some problems,such as flux drift and torque ripple.To resolve these problem,a modified flux caculation method and some measures such as speed LPF,torque slide filtering are adopted.The system performance is enhanced by these mersures.The system control software is designed in assemble language based on the hardware fundament with using TMS320F240 as core and a speed sensorless DTC algorithm is realised. The experimental results indicate that the design of this system is successful. The system has stable performance with fast response, so to some extent it is a practical useful system更多还原