变频感应电机场路耦合仿真和铁耗研究

发布时间：2018-09-04 06:09

【摘要】：随着电力电子技术和微机控制技术的进步,变频感应电机在工业生产中得到了广泛应用。然而,变频器输出的非正弦信号使变频感应电机的设计变得困难和复杂。为了精确合理的设计变频器供电下的感应电机,提出了一种基于场路耦合法的感应电机及其变频控制系统设计和分析的新方法。该方法基于感应电机电磁有限元分析模型和变频控制系统模型,利用场路祸合协同仿真技术,能够有效地分析出感应电机与控制系统之间的相互耦合特性及变频感应电机的性能等。另外,感应电机采用变频器供电时,电机铁耗的分析和计算也变得更加复杂,这是变频感应电机设计中的难题之一。本文的主要工作如下：首先,介绍了变频感应电机的基础理论,包括两大基本变频控制方式,SPWM、 CHBPWM和SVPWM三种变频调制技术,变频感应电机的数学模型及其矢量控制理论。其次,介绍了变频感应电机性能分析方法,包括损耗、效率、电磁转矩等稳态性能的计算和分析。主要针对于铁耗的计算进行了详细阐述,包括铁磁材料损耗产生的物理机理和各项损耗计算模型及不同的电机铁耗计算模型等。然后,提出了一种基于场路耦合法分析变频感应电机系统性能的新方法。利用Maxwell+Simplorer的仿真平台,搭建了变频感应电机场路耦合的仿真模型,包括感应电机的电磁分析模型和基于转子磁场定向的SVPWM矢量控制变频调速系统模型。实现了变频感应电机从空载起动,然后突加负载运行这一动态过程的仿真研究。在控制系统模型中给出了各环节的详细设计过程,包括坐标变换、转速调节器、电流调节器、转子磁链观测器和SVPWM等模块。最后,基于场路耦合法计算分析了变频器供电下感应电机的铁耗,通过样机空载实验验证了计算的准确性和有效性。此外,针对于电机铁心内部铁耗的分布情况和磁化方式进行了研究和分析,仿真分析了变频器控制参数载波比、调制系数和直流母线电压对电机铁耗的影响。
[Abstract]:With the development of power electronics and microcomputer control technology, frequency conversion induction motor has been widely used in industrial production. However, the non-sinusoidal signal output by frequency converter makes the design of frequency conversion induction motor difficult and complicated. In order to design induction motor accurately and reasonably, a new method of design and analysis of induction motor and its frequency conversion control system based on field circuit coupling method is proposed. The method is based on the electromagnetic finite element analysis model of induction motor and the frequency conversion control system model. The coupling characteristics between induction motor and control system and the performance of frequency conversion induction motor can be effectively analyzed. In addition, the analysis and calculation of the iron loss become more complicated when the inverter is used to supply the induction motor, which is one of the difficult problems in the design of the frequency conversion induction motor. The main work of this paper is as follows: firstly, the basic theory of frequency conversion induction motor is introduced, including two basic frequency conversion control methods: SPWM, CHBPWM and SVPWM. The mathematical model and vector control theory of frequency conversion induction motor. Secondly, the performance analysis method of frequency conversion induction motor is introduced, including calculation and analysis of steady state performance, such as loss, efficiency, electromagnetic torque and so on. The calculation of iron loss is discussed in detail, including the physical mechanism of the loss of ferromagnetic materials, various loss calculation models and different calculation models of iron loss of motor, etc. Then, a new method based on field-circuit coupling method is proposed to analyze the performance of variable-frequency induction motor system. Based on the simulation platform of Maxwell Simplorer, the simulation model of frequency conversion induction electric field circuit coupling is built, including the electromagnetic analysis model of induction motor and the SVPWM vector control system model based on rotor magnetic field orientation. The simulation study of the dynamic process of frequency conversion induction motor starting from no load and running suddenly with load is realized. In the control system model, the detailed design process of each link is given, including coordinate transformation, speed regulator, current regulator, rotor flux observer and SVPWM module. Finally, the iron loss of induction motor fed by inverter is calculated and analyzed based on the field-circuit coupling method, and the accuracy and validity of the calculation are verified by no-load experiment of the prototype. In addition, the distribution and magnetization mode of iron loss in motor core are studied and analyzed. The influence of frequency converter control parameter carrier ratio, modulation coefficient and DC bus voltage on the motor iron loss is simulated and analyzed.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM346

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