Power transformation device

Abstract

The invention provides a power transformation device for providing alternating current with variable voltage and variable frequency to linear induction motor for driving an electric car, and the linear induction motor is provided with a reaction plate arranged on ground and a coil winding carried on the electric car. The power transformation device is provided with an attractive force monitor controller which calculates the attractive force between the coil winding and the reaction plate and controls according to a manner that the calculation result of the attractive force is less than the set value.

Description

[0001] This application is a divisional application of an invention patent application with an application date of January 23, 2008, an application number of 200810008502.3, and an invention title of "Linear Induction Motor Drive System". technical field [0002] The present invention relates to a linear induction motor (linear induction motor) drive system, and more particularly to a linear induction motor for electric vehicles that drive a linear induction motor by using a power conversion device that outputs variable voltage and variable frequency alternating current and utilizes vector control drive system. Background technique [0003] Such as figure 2 As shown, in the linear induction motor train, the coil as the primary circuit of the linear induction motor 109 is mounted on the vehicle 202, and the iron-based magnetic material 212 and the non-magnetic conductor 211 such as aluminum or copper provided on the magnetic material 212 are combined as The reaction plate 20...

AI Technical Summary

Problems solved by technology

[0009] However, in the above example as image 3 As shown, if an excessive attractive force 210 is generated between the linear induction motor 109 and the ferrous magnetic material 212 of the reaction plate 203, the reaction plate 203 will be attracted by the linear induction motor 109 due to excessive force, and there is a reaction possibility of board 203 being damaged

[0010] Moreover, if an excessive attractive force 210 is generated between the linear induction motor 109 and the iron-based magnetic material 212, it may cause damage to the fastening device 206 and the tie 209 supporting the reaction plate 203.

[0011] And, if there is too much attractive force 210 between the linear induction motor 109 and the ferrous magnetic material 212, the shape of the reaction plate 203 will become convex, so that the gap between the linear induction motor 109 and the reaction plate 203 disappears, so , the reaction plate 203 will be in contact with the linear induction motor 109, which may damage the linear induction motor 109 and the reaction plate 203

[0012] In addition, if an excessive attractive force is generated between the linear induction motor 109 and the reaction plate 203, the running resistance increases and the acceleration decreases.

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