基于准Z源直流变换器的无刷直流电机换相转矩脉动抑制若干关键问题研究

发布时间：2018-01-16 08:05

  本文关键词：基于准Z源直流变换器的无刷直流电机换相转矩脉动抑制若干关键问题研究　出处：《上海理工大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： 无刷直流电机 准Z源变换器 转矩脉动抑制 系统仿真 控制算法

【摘要】：永磁无刷直流电机具有转矩输出大、效率高、响应速度快、寿命与可靠性高等特点,因此在办公自动化、数码电子、工业控制、汽车领域以及医疗设备等领域有着广泛的应用。但是采用方波驱动的无刷直流电机存在有转矩脉动问题。对于高精度高可靠性要求的系统,如何抑制转矩脉动则是衡量其性能的重要依据。近年来,通过增加前级直流变换器,调节在换相期间的母线直流电压,成为抑制换相转矩脉动的控制方法之一。本文首先阐述了无刷直流电机换相转矩脉动产生的几种原因,对换相期间相电流出现的几种情况进行了分析,验证了增加前级直流变换器来抑制换相转矩脉动方法的效果,建立了抑制转矩脉动所需的换相电压,换相时间的参数模型。同时简单介绍了准Z源直流变换器的工作原理及其特点,并对变换器的电子元器件参数设计提出了参考方案。接着,在MATLAB/Simulink环境下对无刷直流电机换相转矩脉动抑制方法进行仿真,对获取的实验数据进行分析。仿真结果证明,该电路能够动态的抑制换相转矩脉动,稳态情况下转矩脉动可以减少到8%以下,同时能够适当提高平均输出转矩。最后,搭建了基于STM32控制芯片的无刷直流电机控制电路,详细的介绍了硬件电路各个部分结构以及参数设计方法,换相转矩脉动抑制的软件控制算法,分析了不同转速情况下的相电流波形。实验结果证明本文提出的无刷直流电机转矩脉动抑制方法可靠有效。
[Abstract]:Permanent magnet brushless DC motor has the characteristics of large torque output, high efficiency, high response speed, high life and reliability, so in office automation, digital electronics, industrial control. Automobile and medical equipment are widely used. However, there is torque ripple problem in brushless DC motor driven by square wave, which requires high precision and high reliability. How to suppress torque ripple is an important basis to evaluate its performance. In recent years, the bus DC voltage during commutation period is adjusted by adding forward DC converter. It is one of the control methods to restrain commutation torque ripple. Firstly, several reasons of commutation torque ripple of brushless DC motor are described, and several situations of phase current during commutation are analyzed. The effect of the method of restraining commutation torque ripple by adding the former DC / DC converter is verified, and the commutation voltage needed to suppress the torque ripple is established. At the same time, the working principle and characteristics of quasi-Z-source DC / DC converter are briefly introduced, and the reference scheme for the design of the electronic components parameters of the converter is put forward. The commutation torque ripple suppression method of brushless DC motor is simulated in MATLAB/Simulink environment, and the obtained experimental data are analyzed. The circuit can dynamically suppress commutation torque ripple, steady state torque ripple can be reduced to less than 8%, at the same time can improve the average output torque. Finally. The brushless DC motor control circuit based on STM32 control chip is built. The hardware circuit structure and parameter design method and the software control algorithm of commutation torque ripple suppression are introduced in detail. The phase current waveform at different rotational speeds is analyzed and the experimental results show that the proposed torque ripple suppression method for brushless DC motor is reliable and effective.
【学位授予单位】：上海理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM33
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本文编号：1432235