| 摘要 |
In a transportation system, a vehicle driven by an induction motor, is guided along a given path. Adjacent to the path is at least a section of electrical conductor which is electrically connected to the induction motor by means of pickup or collector shoes on the vehicle. The speed of the vehicle is controlled by varying the frequency of the electrical power fed to the electrical conductor. This can be accomplished by using a power source whose frequency varies with time or by using several power sources, each having a different frequency; each of such power sources being connected to a different segment of the section; such segments being insulated from each other.
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