无刷直流电机pwm控制的研究3.docVIP

摘 要 无刷直流电机是利用电子换相代替电刷机械换向的一种新型直流电机，它既具有传统有刷直流电动机的调速性能，又具有交流电机结构简单、运行可靠、维护方便等优点。而且体积小、效率高，在许多领域已得到了广泛的运用。然而无刷直流电机也存在转矩脉动、无位置传感器的位置检测难等一些缺点，如何解决这些问题使得对无刷直流电机的研究更有意义。 MATLAB是矩阵实验室的简称，是美国MathWorks公司出品的商业数学软件，用于算法开发、数据可视化、数据分析以及数值计算的高级技术计算语言和交互式环境，主要包括MATLAB和Simulink两大部分。它在数学类科技应用软件中在数值计算方面首屈一指。主要应用于工程计算、控制设计、信号处理与通讯、图像处理、信号检测、金融建模设计与分析等领域。 论文从研究永磁无刷直流电机的结构出发，详细论述了其工作原理及换相过程。通过分析，在理论上得到了换相过程引起转矩脉动的主要因素，并介绍减小换相转矩脉动的方法。根据无刷直流电机的数学模型，建立了无刷直流电机本体在MATLAB中的仿真模型，并建立了系统仿真模型，对无刷直流电机的控制进行了仿真实验。 关键词：无刷直流电机；转矩脉动；仿真模型 Abstract Brushless DC motor is a new electronics brush machinery commutation which using the electronic phase change one kind of new DC motor, it both has the traditional advantage which have brushes DC motors velocity modulation performance, and has the alternating current machine structure to be simple, movement is reliable, maintenance convenience and so on. Moreover the volume is small, the efficiency is high, and it has obtained the widespread utilization in many domains. However Brushless DC motor also have the torque pulsation, the non-position transducers position to examine and some shortcomings, so how to solve these problems make Brushless DC motor research to be more meaningful. MATLAB is Matrix lab , is the MathWorks company business mathematics software is used to develop, data visualization algorithm, data analysis and numerical calculation of senior technical calculation language and interactive environment, including MATLAB and Simulink two most. It in mathematics class technology application in numerical fields. Mainly applied in engineering design, calculation, the control signal processing and communication, image processing and signal detection, financial modeling design and analysis. The paper start from studying Brushless DC motors structure and then elaborated its principle of work and the phase change process in detail. By the analysis, we can obtain the phase change process to cause the torque pulsation primary factor theoretically, and introd