Superconducting long stator linear motor and its control method

Abstract

The invention discloses a superconducting long-stator linear motor for a superconducting maglev train, comprising: a superconducting magnet installed at the position of the axis of the train bogie, and used to generate a first magnetic field with opposite polarities on both sides of the train; Multiple pairs of long stator coils, each pair of long stator coils is evenly laid in the grooves on both sides of the track, the centerline of the long stator coils is at the same height as the centerline of the coils in the superconducting magnet, and is used to form a The traveling wave magnetic field in the track direction and with opposite polarity makes the traveling wave magnetic field generate the first resultant force acting on the geometric center of the bogie under the action of the first magnetic field, so as to realize the traction and braking of the train; multiple pairs of 8-shaped coils are located in the superconducting magnet Between multiple pairs of long stator coils, it is used to generate the second resultant force used to control the train to be in a balanced position under the action of the first magnetic field, so as to realize the suspension guidance of the train. The invention improves the traction force density and the utilization rate of the superconducting magnet, and saves the cost of the maglev train.

Description

technical field [0001] The invention relates to the field of rail transportation, in particular to a single-magnet superconducting long-stator linear motor used for bilateral drive of superconducting maglev trains and a control method thereof. Background technique [0002] Superconducting maglev train is a unique train system developed by applying superconducting materials to maglev linear traction motors. It utilizes the zero-resistance and constant-current characteristics of superconducting materials and the strong magnetic field generated by superconducting coils, and uses superconducting materials for traction linear motors, and uses its traction to drive trains forward. The train is suspended above the track and has no contact and friction with the track. It is one of the important forms of ultra-high-speed rail transportation at present. [0003] In the existing superconducting traction linear motor technology, there are several solutions as follows. First, traction,...

AI Technical Summary

Problems solved by technology

Although this method can make the maglev structure of the maglev train simpler, it increases the difficulty of decoupling control

Second, the linear motor in the electromagnetic propulsion system of high-speed maglev traffic uses stator coils to achieve traction, and uses permanent magnets to achieve train suspension. The internal structure of this method is relatively redundant, and the reliability of traction and suspension capabilities is insufficient. The magnetic field strength is not too large, and the train suspension air gap will be very small, which has high requirements for the precision of track construction and car body manufacturing

Third, only superconducting coils are used to achieve train suspension, and permanent magnet synchronous motors are used to achieve train traction. Since the permanent magnet material limits the traction force of the linear motor, the traction and braking performance of this scheme is slightly insufficient

In addition, the superconducting traction linear motors in the prior art often have problems such as increased complexity of motor control due to internal structure, insufficient performance or insufficient reliability of traction and suspension forces, etc.

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