A shaft control braking method and system matching a permanent magnet synchronous traction system

Abstract

The invention provides an axle-controlled braking method and system matching a permanent magnet synchronous traction system, including: during the axle-controlled braking process of the train, if the permanent magnet traction motor on the target axle on the target bogie fails, all the The traction control unit of the target axle sends a fault signal to other traction control units on the train; the fault signal includes the missing braking force of the faulty permanent magnet traction motor; after receiving the fault signal, the other traction control unit According to the missing braking force and the total number of normal permanent magnet traction motors on the train, the actual braking force of each normal permanent magnet traction motor is determined. The present invention can prevent the supplementary air braking force from being applied to the other axles that are normally operated by electric braking when a traction control failure occurs on a certain axle, resulting in the extra supplementary air braking force of the normally applied electric braking force axle, and the total braking force exceeding the normal Axle sticking is limited, and the wheel slips causing a mixed action of traction and braking.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to an axle control braking method and system matching a permanent magnet synchronous traction system. Background technique [0002] Compared with the traditional AC asynchronous traction system, the permanent magnet synchronous traction system has significant advantages such as high power density, high efficiency, high power factor, low noise, and light weight. The permanent magnet traction system is applied to the traction of rail transit vehicles, which can increase traction power, save energy and reduce consumption, reduce maintenance, and reduce life cycle costs. At the same time, compared with the single-car traction / braking control in the traditional scheme, the permanent magnet synchronous traction system can realize the single-axis control of traction / braking, that is, when the traction control unit fails, it will only affect the traction of the four axles of the car. ...

AI Technical Summary

Problems solved by technology

[0004] When the remaining three axles exert their maximum braking force and still cannot recover to the total electric braking force of the four axles working normally, according to the principle of braking force distribution, the missing braking force needs to be supplemented by the braking system, but the design of the braking system is Control or frame control, at this time, the braking force supplemented on the faulty shaft will also be supplemented to the other normal working shafts, causing the shaft with normal electric braking power to supplement the air braking force, and the braking force exceeds the normal shaft adhesion limit, and the wheels will stop Will slide, causing traction anti-skid and braking anti-skid mixed action

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