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Research on a unistor equivalent circuit of linear induction motor and its parameter estimation.

直线感应电机单阻等效电路及其参数估计研究

基本信息

批准号：
06650334
负责人：
UTSUMI Tatsumi
金额：
$ 0.77万
依托单位：
Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650334/
关键词：
Unistor LIM 3-phase equivalent circuit Power matrix Thrust ripple Instantaneous secondary power Ripple coefficients

项目摘要

By analyzing a 3-phase equivalent ciercuit of linear induction motor (LIM) based on an imaginary element unistor, investigators made the following points clear.(1) Input voltage and current on each terminal of 3-phase LIM are unbalanced under the driving condition. The cause of this phenomenon comes from the end effect of LIM.Therefore LIM should be represented by a 3-phase equivalent circuit with 4 terminals, not by a single phase equivalent circuit.(2) By reason of the effect of LIM,magnetic distribution in the air gap changes with velocity of secondary conductor. The iron loss and other parameters on the equivalent circuit are the functions of velocity. Therefore the determination of circuit parameters should be done under the driving condition.(3) The distribution of power was estimated by the complex power matrix. According to the power matrix, the power is usually unbalanced in each phase of LIM and source.(4) The instantaneous secondary power on the secondary resistance in each phase was estimated. This instantaneous secondary power produces the thrust ripple. As the thrust ripple is dangerous if it resonate with mechanical system of the vertical transportation, the decrease of ripple is the most problem to solve today.(5) Ripple coefficients K_C and K_S were induced and estimated from the equations of instantaneous secondary power. They were verified by the measurement of cylindrical LIM in vertical driving system.

通过对基于虚元电阻的直线感应电动机三相等效电路的分析，明确了以下几点。(1)三相直线感应电机在驱动工况下，各端输入电压和电流不平衡。这种现象的原因是由于直线感应电机的端部效应，因此直线感应电机应该用一个三相四端等效电路来表示，而不是用单相等效电路来表示。(2)由于直线感应电动机的作用，气隙中的磁场分布随次级导体的运动速度而变化。等效电路中的铁损等参数是速度的函数。因此，电路参数的确定应根据实际工况进行。(3)利用复功率矩阵估计功率分布。根据功率矩阵，功率通常在LIM和电源的每一相都是不平衡的。(4)估计了各相次级电阻上的瞬时次级功率。这种瞬时的次级动力产生推力涟漪。由于推力脉动与垂直运输机械系统发生共振是非常危险的，因此减小涟漪是目前最需要解决的问题。(5)从瞬时二次功率方程出发，推导并估算了涟漪系数KC和KS。通过对垂直驱动系统中圆柱形直线感应电机的测量，验证了这一结论。