In a part of new type transit, linear induction motors (LIMs) have been used as a direct electromagnetic drive device without adhesion. In Japan, the LIM-driven train has been used in the subway in some large cities, as the LIM reduces the construction cost of tunnel because the thin shape makes the sectional area of tunnel small and the large gradability enables the minimum length of the route. In another case, the LIMs are used in magnetic levitation vehicle called HSST which will be used for the urban or intercity transit, and in an air suspended vehicle with low floor which aims to be used for a personal rapid transit. On these LIM-driven trains, there is the problem of large power consumption. That is, the efficiency is not satisfactory. In the induction type motor, the efficiency depends on the operating slip and the small slip is required fundamentally for the high efficiency. On the other hand, the LIM has its own end effect which decreases the efficiency and power factor in the small slip region. The influence of end effect becomes serious as the speed increases. That is, the essential measure for high efficiency is to overcome the end effect, which is a long-pending object. Under the condition that there is restriction on the length of LIM, the compensation of end effect is the only method for remarkable improve of the characteristics. The compensating winding method was proposed previously, but it was not effective. In the paper a new type of end effect compensator is proposed. Based on the proposed concept, the compensation method of the magnet rotator type and AC coil type of compensators are developed respectively. The utility is not yet confirmed. As for the long LIM with length of 10m, the analysis shows that the efficiencies are about 85% at 40 km/h and above 90% at 360 km/h respectively.


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    Title :

    Methods for improving efficiency of linear induction motor for urban transit


    Additional title:

    Methoden zur Verbesserung des Wirkungsgrades eines linearen Induktionsmotors für den Stadtverkehr


    Contributors:


    Publication date :

    2004


    Size :

    6 Seiten, 7 Bilder, 5 Tabellen, 4 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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