【作者】 陈银莲；

【导师】 孙玉坤；

【作者基本信息】 江苏大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 开关磁阻电机驱动系统(简称SRD)是一种新颖的机电一体化装置,具有结构简单、换能效率高等优点。SRD的位置信息,对于通过决定开通、关断换相时刻来准确控制转速和转矩及进一步优化电机运行性能来说是必要的。所以位置检测环节是开关磁阻电动机正常运转的基础。由于传统的直接安装位置传感器检测方案存在着易受环境干扰等弊端,导致了利用SRD电气参数解算位置信号的间接位置检测技术的产生和发展。本课题提出了一种新的间接位置检测技术,即低速时的脉冲注入法结合高速时的滑模观测器法,以TI公司电机控制专用芯片DSP(TMS320F240)为核心设计了无位置传感器运行的开关磁阻电动机驱动系统,并进行理论研究和实验探索。首先,回顾开关磁阻电机的发展历程和应用状况,并简要介绍间接位置检测技术的分类和实际应用情况。其次,详细介绍开关磁阻电机本体结构以及开关磁阻电机调速系统的组成和控制策略。第三,通过有位置传感器的开关磁阻电机转子位置检测原理说明转子位置信号的作用与换相逻辑,提出一种新的间接位置检测技术,即低速时的脉冲注入法结合高速时的滑模观测器法,并对该技术进行仿真。最后,设计了采用该间接位置检测技术的无位置传感器运行的数字系统,对象为一台1.22kW的开关磁阻电动机样机,以TMS320F240 DSP为核心,包括硬件电路设计和软件流程算法设计两部分,并在实际系统设计的基础上,进行了无位置检测器的开关磁阻电机实验研究,实验波形验证了相关理论。更多还原

【Abstract】 The switched reluctance motor drive system (SRD) is a novel mechanical -electrical device with the virtue of simple structure and high efficient. The rotor position information in SRD is essential in detaining the switching instants for proper control of speed, torque and further optimizing the motor operation performance. So rotor-position estimation is a necessary factor of a SRD to run properly. As the drawbacks of the traditional direct rotor-position detecting schemes, which are liable to be influenced by the environmental factors, the indirect rotor-position estimation techniques, applying some of SRD’s electrical parameters to work out rotor position information, are so that created and developed rapidly.This paper presented a novel position estimation technique for Switched Reluctance Motors (SRM). The technique combines two different methods to deliver high resolution position information over the wide speed range. At zero and low speeds, a voltage pulse injection method is used to estimate the rotor position. For higher speeds, a sliding mode observer (SMO) based algorithm is used and combined to work with the low speed algorithm. The design of the new sensorless drive system for SRM is based on the Texas Instruments TMS320F240 DSP.Firstly, this paper summarized the development and application of SRM, analyzed the indirect rotor position sensing methods of sensorless SRD.Secondly, this paper summarized the running mechanism of SRD and analyzed how to control this system, and also compared all control methods.Thirdly, this paper described the principle of rotor position sensing and commutation logic of SRM with the presence of position sensor, and then presented a novel direct rotor position sensing technique which combined a voltage pulse injection method at zero and low speeds to a sliding mode observer algorithm at higher speeds. The technique was simulated in MATLAB.Finally, this paper designed a sensorless drive system based on TMS320F240 DSP. In this chapter, the hardware design and the software design were all listed clearly. Experiments had been done on this practical system. The experimental results demonstrate the effectiveness of this new combined technique.更多还原