Method for inhibiting temperature rise of motor bearing by alternating current-direct current-alternating current electric multiple units

Abstract

The invention relates to a method for inhibiting the temperature rise of a motor bearing by a traction converter of alternating current-direct current-alternating current electric multiple units. Themethod comprises the following steps that rotate speed signals of speed 1, speed 2, speed 3 and speed 4 of four motors and a vehicle speed signal n of a whole vehicle are detected in real time, and absolute values of the difference values of n-speed 1, n-speed 2, n-speed 3 and n-speed 4 are calculated correspondingly; if the absolute value of the difference value of any one is greater than a preset threshold signal Fset, actual torque given values of the motors are reduced by 10%, otherwise, the actual torque given values of the motors are increased by 10%; and the motor torque values subjected to the increase and decrease judgment is subjected to torque limiting processing and then is used as an actual torque output value Te, and meanwhile, the actual torque output value Te is compared with a given motor torque value Te *, and a smaller value is taken as the actual given value of the motor torque, and as the motor actual torque given value in the next judgment period. According to themethod, the problem that the alternating current-direct current-alternating current electric multiple units is in a low speed state and the motors are in a serious overload state due to load distribution imbalance caused by the problems such as wheel diameters and adhesion is solved, and the temperature rise of the motor bearing is effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of motor bearing temperature control, and in particular relates to a method for suppressing the temperature rise of a motor bearing for an AC / DC / AC electric train set. Background technique [0002] After years of high-speed railway construction, our country has a well-developed railway network, which is now the top in the world. The railway network extending in all directions connects all parts of China into one. [0003] In order to save the space of the train body and reduce the purchase cost of the train, the traction drive system of the EMU widely adopts the vehicle control method, and one traction converter drives all the parallel traction motors of the same EMU. This control method reduces the use of power devices and simplifies While improving the control structure, it also brings a series of problems. [0004] Due to manufacturing errors and different degrees of wear and tear of EMU wheels during op...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for suppressing the temperature rise of motor bearings for AC-DC-AC electric multiple units, which solves the problem of unbalanced load in the vehicle control mode

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