A Complete Equivalent Circuit for Linear Induction Motors With Laterally Asymmetric Secondary for Urban Railway Transit

Since the linear induction motor commonly work with a laterally asymmetric secondary as it is applied to pull rail vehicles, this paper presents a complete equivalent circuit model considering the asymmetry to predict thrust, vertical and transversal forces. First, six correction factors are presented to quantify the variations in the air-gap magnetic flux and secondary induced current as the linear induction motor operating with a laterally asymmetric secondary. Second, it develops a circuit model based on the existing T-model for the rotary induction motor and two correction factors for the magnetizing branch, which is used to indicate the electromagnetic variations in the air-gap flux and secondary plate due to the asymmetry. Third, the mathematical expressions for the thrust, vertical and transversal forces are derived by applying the equivalent circuit model. Then, the six correction factors are calculated with a prototype motor, and the results of them are comprehensively analyzed. Finally, the characteristics in the prototype motor are calculated with the mathematical expressions in a range of rated speed，and validated by the experimental measurements carried out on a test rig and line for linear motors

Многокоординатный прецизионный позиционер на базе сервоприводов

Общая информация об изделии. Разработка системы управления двигателями. Расчет и настройка регуляторов токового, скоростного, позиционного контуров. Разработка программного обеспечения для осуществления многокоординатного движения. Проверка максимально достижимых динамических характеристик.General product information. Development of motor control system. Calculation and tuning of current, speed, position loops. Software development for multi-axis movement. Checking the maximum achievable dynamic characteristics