Winding step change method for long stator linear synchronous motor stator section of medium-speed maglev train

Abstract

The present invention discloses a step changing method for a stator segment winding of a medium speed magnetic suspension train long stator linear synchronous motor. The step changing system for the stator segment winding of the medium speed magnetic suspension train long stator linear synchronous motor comprises: a main converter unit U1, an auxiliary converter U2, two sets of feeder cables, anda row of long stator linear synchronous motor stator segment winding placed in the middle of the track. The main converter unit U1 is a large-capacity converter that satisfies power output requirements in state of traction acceleration etc.; the auxiliary converter unit U2 has a smaller capacity than the main converter unit U1, and is used for current regulation of a next stator segment winding during step changing process. When the train runs on a stator segment winding n, the main converter unit U1 participates in power supply. When the train is in state of changing step from the stator segment winding n to a stator segment winding n+1, the stator segment winding n is supplied by the main converter unit U1, and the stator segment winding n+1 is supplied in parallel by the main converterunit U1 and the auxiliary converter unit U2. When the train fully enters the stator segment winding n+1, only the main converter unit U1 supplies power.

Description

technical field [0001] The invention relates to a step changing method for a stator section winding of a long stator linear synchronous motor of a maglev train. Background technique [0002] The maglev train is a new type of transportation tool, and its essence is a long-stator linear synchronous motor, that is, the car body is the motor mover, and the railway track is the motor stator. It uses the electromagnetic force generated by the linear motor to drive the vehicle, which has the advantages of high speed, energy saving and safety. The stator of the long stator linear synchronous motor is much longer than the mover, and only the covered part of the stator can produce effective traction. The uncovered part of the stator winding impedance will only consume energy. Great waste of electric energy. Therefore, a segmented power supply method must be adopted, that is, the stator of the linear motor is divided into several segments, and only the winding of the stator segment w...

AI Technical Summary

Problems solved by technology

The short-circuit method only needs one converter, the wiring is relatively simple, and it is easier to implement in engineering, but the output current of the converter will be reduced to zero during the switching period, and the train will lose traction

The traction force will not decrease during the switching process of the step-skipping method, but only one converter is in the normal operation after the switching is completed, and the other one is idle, resulting in a waste of resources

The two-step method is the most economical and practical step-changing method, with high operational reliability, but the traction force is reduced to half of the original during the step-changing process, and there is a speed loss

The traction force of the three-step method will not be reduced, there is no speed loss, and it is beneficial to switch during high-speed operation, but it requires three converters, the wiring is complicated, and there is always a converter in a waiting state when running at a non-switching point , not put into work, resulting in waste of resources

[0004] For medium-speed maglev trains with a single center-mounted long-stator linear synchronous motor structure, a step-changing method similar to the three-step method can be used, and two converters are alternately powered, but this method also always requires a converter It is in a waiting state and has the disadvantage of wasting resources

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