【作者】 宋鹏；

【导师】 王晓远；

【作者基本信息】 天津大学 ， 电机与电器， 2006， 硕士

【摘要】 盘式永磁电机功率密度高,动态性能良好,是理想的机电一体化组件。对这种电机的研究可以促进我国新一代高性能伺服电机及伺服系统发展。而且,考虑到我国具有丰富的稀土资源,这项研究更显得意义重大。本课题的研究目的,是希望能开发出适合于盘式无铁心永磁电机的驱动系统,充分发挥其结构和动态性能方面的优点。为此,本设计在控制方法上选择了转矩响应迅速的直接转矩控制方法。直接转矩控制应用于永磁同步电机的研究在国内外尚处在理论探索阶段,还不成熟;而对盘式无铁心永磁电机采用直接转矩控制方法,以期获得非常快速的转矩动态响应,这样的尝试更是首创。研究工作首先分析了盘式无铁心永磁电机的结构特点,对实验样机进行了磁路分析和参数计算,建立起电机的数学模型。接下来又重点研究了直接转矩控制在永磁同步电机上的应用,经过数学推导得到电磁转矩关于定、转子磁链矢量夹角的正弦值和这两个矢量幅值的乘积的表达式,并由此决定了对定子磁链的控制方式。为了改善系统的稳态性能,设计中还采用空间矢量调制的方法代替传统的滞环比较方法来生成电压PWM,这样做不但有效减少了稳态时的转矩脉动,而且降低了功率开关器件的开关损耗。在理论分析和计算机仿真的基础上,我们以DSP为控制核心,结合算法编程的实际需要选用高性能硬件来完成调速驱动系统设计。实验结果表明,设计出的盘式无铁心永磁电机直接转矩控制调速系统具有快速的转矩响应和良好的动态特性,其稳态时的转矩脉动也比传统直接转矩控制小很多。更多还原

【Abstract】 The disk type PM synchronous motor has high power density and excellent dynamic performance at the same output power or shaft torque. Considering abundant rare earth in China, research on this kind of motor shows great meaning to the development of high performance motor and its driving system.The aim of our study is to design a set of specialized driving system for disk type PMSM that makes full use of its advantage in structure and dynamic performance. Direct torque control method is used by the designed system due to its fast torque response, although it is still in a stage of theoretical study to control PMSM with DTC strategy. This paper proposed to execute DTC on a coreless disk type PMSM to get very fast dynamic torque response. Such work has been done by no one until our study begin.The research of this paper includes the following contents: first of all, the structure characters of coreless disk type PM motor are introduced. The mathematic model of prototype is built according to the results of magnetic circuit analysis and attributes calculation. Then the emphasis is put on theoretical discussion of PMSM DTC. It is mathematically proven that the increase of electromagnetic torque in a permanent magnet motor is proportional to the increase of the angle between the stator and rotor flux linkages. Therefore, the fast torque response can be obtained by adjusting the rotating speed of the stator flux linkage as fast as possible. To improve the steady-state behavior, our design substitutes Space Vector PWM for traditional hysteresis PWM. It leads to the reduction of torque ripple and switching losses of power transistors.Finally, the speeding driving system is designed based on theoretical analysis and computer simulation. High performance hardware with a DSP core is used to match requirements of software programming. Experimental results shows that the coreless disk type motor DTC system has extremely fast torque response and satisfying dynamic performance, and its torque ripple in steady-state is much smaller than normal DTC system.更多还原