Capacity-expanding main circuit of railway train AC traction electric motor

Abstract

A train alternating current traction electric motor capacity-enlarging main circuit is used for overcoming the power restraint of the motor train and locomotive. The circuit is installed with a transfer switch between the main current transformer and the pulling motor. Each phase of the stator winding of the pulling motor are divided into a plurality of segments according to pole and phase. Each segment of each phase of the stator winding is series-connected to parallel connection through the transfer switch thereby keeping the constant of the flux and winding current of the electric motor. The line voltage does not exceed the rated value and the capability of the pulling motor is doubled. The driving force and braking force of the motor train and locomotive are reinforced to obtain the effects of increasing the speed and increasing the transporting ability.

Description

Technical field: [0001] The technology of the invention relates to the technical field of electric drive of railway trains, and its scope belongs to electric locomotives, EMUs and electric drive diesel locomotives of trunk lines and intercity rail transits, and is the main circuit part from the converter to the AC traction motor. Background technique: [0002] The capacity of the traction motor plays a decisive role in the operation of the train. For example, Japan's 300 series electric vehicle group, when the speed reaches 136km / h after starting, enters the constant power stage of the traction motor power of 300kw, and when the maximum operating speed reaches 270km / h, the traction force will drop below 50%, "China Star" Even down to less than 1 / 3, all current AC traction motors have capacity limitations, which have the following disadvantages: [0003] A. When the train is towing, the traction force of medium and high speed becomes smaller and the resistance becomes larger...

AI Technical Summary

Problems solved by technology

[0003] A. When the train is towed, the traction force at medium and high speeds becomes smaller and the resistance increases, making the acceleration smaller, making it difficult to increase the speed, even approaching the limit, which affects the capacity and speed of the entire operation

[0004] B. Train braking should be controlled in sections, regenerative and resistance braking power is insufficient, and the deceleration at medium and high speeds is also small. Emergency braking under normal and fault conditions must form a composite braking with disc braking, especially for trains. When the speed is above 300km / h, the power of the disc brake is not enough, and the difficulty of braking results in a longer braking distance, which also affects the overall running speed, capacity and even safety and reliability.

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