000085797 001__ 85797
000085797 005__ 20180501105856.0
000085797 0247_ $$2doi$$a10.5075/epfl-thesis-3569
000085797 02470 $$2urn$$aurn:nbn:ch:bel-epfl-thesis3569-2
000085797 02471 $$2nebis$$a5168778
000085797 037__ $$aTHESIS_LIB
000085797 041__ $$aeng
000085797 088__ $$a3569
000085797 245__ $$aComparative study and selection criteria of linear motors
000085797 269__ $$a2006
000085797 260__ $$aLausanne$$bEPFL$$c2006
000085797 300__ $$a239
000085797 336__ $$aTheses
000085797 520__ $$aInitially, linear motors have been particularly dedicated to transportation systems. Nowadays, linear motors are meant to replace a system using a rotating motor and a transmission to realize a linear movement. With linear motors the performances increase considerably since the mechanical limitations are removed. This leads to a better precision, a higher acceleration and a higher speed of the moving part. Therefore, direct drives with linear motors are increasingly used in industrial applications although these solutions need often more investment costs. Different linear motor structures and technologies exist. They can be either induction or synchronous motors with a transverse or a longitudinal flux. Furthermore, linear motors may have several topologies. They can be either long or short stator and double or single sided. All these variants may be combined giving therefore numerous possibilities to perform a linear movement. Hence, to make the best choice for a given application, a global methodology based on the comparison of optimized motors is presented in the thesis. This design methodology is based on figure of merits which are bound to the specifications of the studied application. This method differs from a conventional one since optimized motors with the same objective function are compared. The optimized motors are obtained by an indirect method based on an optimization algorithm (Sequential Quadratic Programming, SQP). An indirect approach differs from the conventional deterministic one for which at least one parameter must be fixed to obtain a motor pre design, since there are constraints and validity domain which are introduced. The proposed methodology can be applied either to rotating or to linear motor design. The use of an optimization program to perform motor designs requires analytical motor models. The models developed in this thesis take into account the thermal behavior of the motors in order to achieve more realistic results. Furthermore, the analytical models of synchronous motors are thoroughly studied leading to several interesting conclusions. They are based on well known algorithms developed for rotating motors. The proposed models are very accurate in comparison with the FEM program, except for a transversal flux linear motor for which the obtained results are not worthwhile enough to be optimized. This is caused by the structure of the motor which is close to a reluctant motor and imposes to model the motor by a lumped magnetic scheme. Moreover, a global analysis of the windings due to the particularity of linear motor to have an even or odd number of poles is presented in the thesis. The methodology proposed in the thesis is successfully used for an innovative application which deals with a multi mobile system for a lift. For this lift, several cabins travel in the same shaft implying linear motors to move autonomously each cabin. First, by comparing the different motor technologies, the best motor type is selected. Afterwards, the motor windings for the selected motors are analyzed and compared in order to find the most adapted one for this application. The motor is finally optimized, leading to a motor design proposal. This motor design takes into account the thermal behavior, the material cost and the electrical characteristic of the linear motor.
000085797 6531_ $$alinear motors
000085797 6531_ $$aanalytical models
000085797 6531_ $$adesign methodology
000085797 6531_ $$acomparison methodology
000085797 6531_ $$aoptimization processes
000085797 6531_ $$alift system
000085797 6531_ $$amulti mobile system
000085797 6531_ $$amoteurs linéaires
000085797 6531_ $$amodèles analytiques
000085797 6531_ $$améthodologie de dimensionnement et de comparaison
000085797 6531_ $$aprocessus d'optimisations
000085797 6531_ $$atechnologie pour ascenseur
000085797 700__ $$0(EPFLAUTH)115273$$aChevailler, Samuel$$g115273
000085797 720_2 $$0240205$$aJufer, Marcel$$edir.$$g105519
000085797 8564_ $$s5122719$$uhttps://infoscience.epfl.ch/record/85797/files/EPFL_TH3569.pdf$$yTexte intégral / Full text$$zTexte intégral / Full text
000085797 909C0 $$0252066$$pLAI$$xU10351
000085797 909CO $$ooai:infoscience.tind.io:85797$$pDOI$$pthesis$$pthesis-bn2018$$pDOI2$$pSTI
000085797 918__ $$aSTI$$dEDPR
000085797 919__ $$aLAI
000085797 920__ $$a2006-7-3$$b2006
000085797 970__ $$a3569/THESES
000085797 973__ $$aEPFL$$sPUBLISHED
000085797 980__ $$aTHESIS