Linear induction motor drive system

Abstract

A driving system of a linear induction motor (109) on the upper side of a tramcar (202) is equipped with: an electric power transformation device for outputting AC with variable voltage and variable frequency; a coil winding as the primary circuit of the linear induction motor and power-supplied by the power transformation device; a reaction plate (203) as the secondary conductor of the linear induction motor and arranged at upper side of the ground and driving the tramcar by means of the linear induction motor. The upper side of the tramcar is also provided with: a controller for calculatingattractive force; an attractive force monitoring controller (111) which implements the control in a manner of putting the result of the attractive force under the predetermined value. The controller for calculating attractive force corrects the voltage, current and frequency applied on the linear induction motor based on the attractive force result calculated according to the voltage, current andfrequency applied on the linear induction motor. Thus, the safety can be improved through monitoring the attractive force and restraining the over-attractive force.

Description

technical field [0001] 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 [0002] like 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 203 of the secondary circuit is laid between the two rails 204. When a three-phase AC is applied to the primary circuit coil of the linear induction motor 109 to generate a moving magnetic field, the magnetic field passes through the reaction pla...

AI Technical Summary

Problems solved by technology

[0008]However, in the above example, FIG. 3, if an excessive attractive force 210 is generated between the linear induction motor 109 and the iron-based magnetic material 212 of the reaction plate 203, the reaction plate 203 will be too large. is attracted by the linear induction motor 109, there is a possibility that the reaction plate 203 is damaged

[0009] Moreover, if an excessive attractive force 210 is generated between the linear induction motor 109 and the ferrous magnetic material 212, it may damage the binding device supporting the reaction plate 203. 206 and sleepers 209 bring damage

[0010] Moreover, if an excessive attractive force 210 is generated 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, therefore, 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

[0011] 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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