【作者】 张志杰；

【导师】 欧阳斌林；

【作者基本信息】 东北农业大学 ， 农业电气化与自动化， 2003， 硕士

【摘要】 由于异步电机交流变频调速有着明显的节能功效，以及可以实现连续调速等诸多优点，已成为电气传动领域的研究热点之一。本文主要介绍了一种专用于数字电机控制的新型数字信号处理器(DSP)TMS320F240，及其在变频调速系统中的应用。 本文在介绍了国内外变频调速的现状和变频调速的原理，以及TMS320F240DSP芯片主要特点的基础上，重点阐述了利用这一芯片构建的一个全数字化电机控制的变频调速系统。系统采用简单的开环电压/频率(V/F)控制理论，以及较新的空间矢量脉冲宽度调制(SVPWM)算法，得到了较好的电压空间矢量。 在器件选择上，采用了高性能的DSP芯片，使复杂的矢量控制算法得以方便的实现，采用IPM智能功率模块PM15RSH120，简化了硬件电路，提高了系统的可靠性。 本系统实现了电机的软启动、软关断功能，电机电流的谐波失真较少，电压利用率比常规的正弦波脉冲宽度调制(SPWM)有了较大的提高，器件的开关损耗也得到了明显的减少。而且，由于采用较高的载波频率(20kHz)，大大减少电机的高频噪声，实现所谓的静音变频。该系统具有控制简单，外围电路较少，性价比较高等优点，满足通用变频器，风机和泵类，空调用变频器的性能要求。更多还原

【Abstract】 In the field of electric driving , the adjustable speed control of AC asynchronous motor by inverter was a hot spot because of its energy saving function. A new DSP chip TMS320F240 used in the digital motor control (DMC) was presented, and its application in the VVVF system was discussed.The thesis introduced the actuality in the field of frequency conversion and its principle,and the mostly characteristic of DSP. A DSP based digital motor control system using V/F control and Space Vector PWM technique was developed. The space vector graphs of voltage were presented better.We adopted DSP to realize the complicated vector control algorithm, the IPM PM15RSH120 was used to enhance reliability and it also made hardware circuit simple.The system had auto startup and stop function by software .The DSP based motor control system had lower current harmonic,more efficient use of supply voltage than SPWM, less switch loss. On the other hand, this system make a lower noise for the PWM modulation. Frequency is up to 20KHZ. The system had the advantages of simple control, few peripheral, high performance and low price, which would meet the demands of general purpose inverter, and the inverters using in HVAC(Heating Ventilating Air Conditioning)sysytem..更多还原