【摘要】：PWM變頻供電驅(qū)動電機系統(tǒng)共模電壓在電機耦合電容作用下會在軸承上產(chǎn)生軸電壓和軸電流,影響電機的安全運行。對電機耦合電容的準確計算有助于合理預測軸電壓的大小。本文在分析驅(qū)動系統(tǒng)共模模型基礎上,建立了電機耦合電容計算的有限元分析模型,求得電容參數(shù)。比較了二維和三維有限元下電容計算結(jié)果,指出繞組端部對定子繞組與轉(zhuǎn)子間耦合電容Cwr有較大的影響,計及端部時得到的電容Cwr更接近實測結(jié)果。采用定子繞組電磁散線計算模型可以大大提高定子繞組與鐵心間電容Cwf計算精度。在不同電機端部結(jié)構(gòu)參數(shù)下進行分析計算,發(fā)現(xiàn)定子繞組端部伸直部分長度和鼠籠端環(huán)的軸向長度是影響電容Cwr的兩個主要參數(shù)。對變頻供電下的感應電動機進行三維瞬態(tài)電場有限元分析,表明軸電壓為共模電壓的鏡像,證明了電容分析模型是有效的。
[Abstract]:The common-mode voltage of the motor system driven by PWM frequency conversion will produce shaft voltage and current on the bearing under the action of the motor coupling capacitance, which will affect the safe operation of the motor. The accurate calculation of the coupling capacitance of the motor is helpful to reasonably predict the magnitude of the shaft voltage. In this paper, based on the analysis of the common mode model of the drive system, the finite element analysis model for the calculation of the coupling capacitance of the motor is established, and the capacitance parameters are obtained. The results of capacitance calculation under two and three dimensional finite element method are compared. It is pointed out that the end part of the winding has a great influence on the coupling capacitance Cwr between the stator winding and the rotor, and the capacitance Cwr obtained when the end part is taken into account is closer to the measured result. The calculation accuracy of Cwf between stator winding and iron core can be greatly improved by using the electromagnetic dispersion line calculation model of stator winding. Through the analysis and calculation of the end structure parameters of the motor, it is found that the length of the stator winding end elongation part and the axial length of the squirrel cage end ring are the two main parameters that affect the capacitance Cwr. Three-dimensional transient electric field finite element analysis of induction motor powered by frequency conversion shows that shaft voltage is the mirror image of common-mode voltage, and the capacitance analysis model is effective.
【作者單位】： 北京交通大學電氣工程學院;
【基金】：國家自然科學基金(51107004) 中央高�；究蒲袠I(yè)務費專項資金(2013JBM016)資助項目
【分類號】：TM346

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