【摘要】：隨著電力電子技術(shù)和微機(jī)控制技術(shù)的進(jìn)步,變頻感應(yīng)電機(jī)在工業(yè)生產(chǎn)中得到了廣泛應(yīng)用。然而,變頻器輸出的非正弦信號(hào)使變頻感應(yīng)電機(jī)的設(shè)計(jì)變得困難和復(fù)雜。為了精確合理的設(shè)計(jì)變頻器供電下的感應(yīng)電機(jī),提出了一種基于場(chǎng)路耦合法的感應(yīng)電機(jī)及其變頻控制系統(tǒng)設(shè)計(jì)和分析的新方法。該方法基于感應(yīng)電機(jī)電磁有限元分析模型和變頻控制系統(tǒng)模型,利用場(chǎng)路禍合協(xié)同仿真技術(shù),能夠有效地分析出感應(yīng)電機(jī)與控制系統(tǒng)之間的相互耦合特性及變頻感應(yīng)電機(jī)的性能等。另外,感應(yīng)電機(jī)采用變頻器供電時(shí),電機(jī)鐵耗的分析和計(jì)算也變得更加復(fù)雜,這是變頻感應(yīng)電機(jī)設(shè)計(jì)中的難題之一。本文的主要工作如下： 首先,介紹了變頻感應(yīng)電機(jī)的基礎(chǔ)理論,包括兩大基本變頻控制方式,SPWM、 CHBPWM和SVPWM三種變頻調(diào)制技術(shù),變頻感應(yīng)電機(jī)的數(shù)學(xué)模型及其矢量控制理論。 其次,介紹了變頻感應(yīng)電機(jī)性能分析方法,包括損耗、效率、電磁轉(zhuǎn)矩等穩(wěn)態(tài)性能的計(jì)算和分析。主要針對(duì)于鐵耗的計(jì)算進(jìn)行了詳細(xì)闡述,包括鐵磁材料損耗產(chǎn)生的物理機(jī)理和各項(xiàng)損耗計(jì)算模型及不同的電機(jī)鐵耗計(jì)算模型等。 然后,提出了一種基于場(chǎng)路耦合法分析變頻感應(yīng)電機(jī)系統(tǒng)性能的新方法。利用Maxwell+Simplorer的仿真平臺(tái),搭建了變頻感應(yīng)電機(jī)場(chǎng)路耦合的仿真模型,包括感應(yīng)電機(jī)的電磁分析模型和基于轉(zhuǎn)子磁場(chǎng)定向的SVPWM矢量控制變頻調(diào)速系統(tǒng)模型。實(shí)現(xiàn)了變頻感應(yīng)電機(jī)從空載起動(dòng),然后突加負(fù)載運(yùn)行這一動(dòng)態(tài)過(guò)程的仿真研究。在控制系統(tǒng)模型中給出了各環(huán)節(jié)的詳細(xì)設(shè)計(jì)過(guò)程,包括坐標(biāo)變換、轉(zhuǎn)速調(diào)節(jié)器、電流調(diào)節(jié)器、轉(zhuǎn)子磁鏈觀測(cè)器和SVPWM等模塊。 最后,基于場(chǎng)路耦合法計(jì)算分析了變頻器供電下感應(yīng)電機(jī)的鐵耗,通過(guò)樣機(jī)空載實(shí)驗(yàn)驗(yàn)證了計(jì)算的準(zhǔn)確性和有效性。此外,針對(duì)于電機(jī)鐵心內(nèi)部鐵耗的分布情況和磁化方式進(jìn)行了研究和分析,仿真分析了變頻器控制參數(shù)載波比、調(diào)制系數(shù)和直流母線電壓對(duì)電機(jī)鐵耗的影響。
[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.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM346

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