PWM斩波方式对感应电机铁耗影响的仿真研究

发布时间：2018-01-05 19:30

本文关键词：PWM斩波方式对感应电机铁耗影响的仿真研究　出处：《浙江大学》2017年硕士论文　论文类型：学位论文

【摘要】：感应电机具有结构简单、制造容易、运行可靠等特点,因此应用广泛。在感应电机的损耗中,铁耗占据重要部分,铁耗的精确计算对于感应电机的设计与应用具有重要意义。准确计算铁耗能够帮助电机设计者选用合理的材料用量和冷却手段,避免电机过热,延长电机使用寿命。同时,目前国际能源问题日益严峻,而感应电机消耗了电网很大一部分电能。因此,减小感应电机的损耗、提高感应电机的效率具有重要意义。本文针对变频感应电机,研究脉宽调制(PWM)对电机的影响,并提出新的PWM斩波方式来减小变频感应电机的铁耗。本文在广泛阅读国内外文献的基础上,分析了目前有关脉宽调制对电机铁耗影响和计算变频感应电机铁耗的文献。接着,合理定义了电机内各个损耗的概念,深入分析了当下常用的电机铁耗计算模型和脉宽调制方式,为后续研究奠定了基础。接下来,通过MatlabSimulink和Maxwell仿真实验,研究了几种脉宽调制方式对感应电机铁耗的影响,并总结出了一个计算电机铁耗的经验公式。最后,为了减小高速变频感应电机的铁耗,设计了一种新型双逆变器与并绕绕组电机系统的拓扑结构以及相应的脉宽调制方法。相关的场路耦合时步有限元法的仿真结果表明,所提出的方法能够有效减小高速感应电机的铁耗,提升电机的总体效率。
[Abstract]:Induction motor has the characteristics of simple structure, easy manufacture and reliable operation, so it is widely used. In the loss of induction motor, iron consumption occupies an important part. The accurate calculation of iron loss is of great significance for the design and application of induction motor. The accurate calculation of iron loss can help the motor designer to choose reasonable material and cooling methods to avoid overheating. At the same time, the international energy problem is becoming more and more serious, and the induction motor consumes a large part of electrical energy in the power grid. Therefore, the loss of induction motor is reduced. It is very important to improve the efficiency of induction motor. In this paper, the effect of pulse width modulation (PWM) on induction motor is studied. A new PWM chopping method is proposed to reduce the iron loss of frequency conversion induction motor. The influence of pulse width modulation on iron loss of motor and the calculation of iron loss of variable-frequency induction motor are analyzed. Then, the concept of loss in motor is defined reasonably. The current iron loss calculation model and pulse width modulation are deeply analyzed, which lays the foundation for further research. Next, the simulation experiments are carried out by MatlabSimulink and Maxwell. The influence of several pulse width modulation modes on iron loss of induction motor is studied, and an empirical formula for calculating iron loss of induction motor is summarized. Finally, in order to reduce iron loss of high speed frequency conversion induction motor. In this paper, a new topology and pulse width modulation method of double-inverter and parallel winding motor system are designed. The simulation results show that the coupled time-step finite element method is related to the field circuit. The proposed method can effectively reduce the iron loss of the high speed induction motor and improve the overall efficiency of the motor.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM346

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