Analysis and Calculation of Electromagnetic Torque for the Voltage Source Traction Motors

2013 ◽  
Vol 446-447 ◽  
pp. 672-677
Author(s):  
Xiao Yu Wu ◽  
Zhe Ming Chen ◽  
Ze Hao Huang
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Voltage Source ◽  
Electromagnetic Torque ◽  
Motor Speed ◽  
Traction Motor ◽  
Traction Motors ◽  
Vehicle System ◽  
Mathematical Formulas ◽  
The Time Domain

The traction motor installed on the high-speed train is powered by inverter. A large number of harmonics may appear when motor is operating. Then the motor speed generate oscillation and finally the dynamic characteristic is affected in vehicle system. In this paper, relied on the electromagnetism of traction motor, the mechanism about emerging harmonic torque is analyzed. In addition, based on the equivalent circuit, the method of calculating the parameters in harmonic circuit is proposed. Two mathematical formulas are also proposed to obtain the fundamental electromagnetic torque and the harmonic electromagnetic torque on traction motor. The time domain and frequency domain distributions of the torques are gained and analyzed. Finally a calculation example of traction motor harmonic torque was analyzed and calculated, and prepared for further study of harmonic torque impacting on vehicle system dynamic performance.

Uncontrolled Generation of Synchronous Traction Motors in EV/HEV/PHEV

2013 ◽  
Vol 446-447 ◽  
pp. 497-502
Author(s):  
Xiao Feng Ding ◽  
Zhen Li
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Simple Analytical Model ◽  
Motor Speed ◽  
Traction Motors ◽  
Battery Capacity ◽  
Interior Permanent Magnet ◽  
Drive Signals ◽  
The Impact

Interior permanent magnet synchronous motor (IPMSM) systems are vulnerable to uncontrolled generation (UCG) when the inverter switches loss their drive signals suddenly during flied weakening high speed operation. At this point, uncontrolled rectifier is composed by freewheel diodes in the inverter, the current comes from the motor through the rectifier, and then charges the battery. This paper develops a simple analytical model of this system firstly, and then carries out the simulation of UCG transient process to investigate the impact of the motor speed, battery capacity and other factors on UCG and feedback-power obtained throughout the process. Moreover, circuit improvement is presented in order to avoid destruction risk of the battery, motor, inverter and other relevant components during UCG.

Vibration Transfer Analysis of High Speed Train Considering Car body Flexibility

2012 ◽  
Vol 605-607 ◽  
pp. 1168-1171 ◽  
Author(s):  
Tian Li Chen ◽  
Jing Zeng ◽  
Yao Hui Lu ◽  
Li Min Zhang
Keyword(s):  
System Dynamics ◽  
Vibration Frequency ◽  
High Speed ◽  
Natural Vibration ◽  
Dynamic Performance ◽  
System Dynamic ◽  
Natural Vibration Frequency ◽  
Car Body ◽  
Vehicle System ◽  
Vehicle System Dynamics

In order to research the influence of the flexible car body on the vehicle system dynamic performance and to achieve the reasonable match between high speed and lightweight，it is necessary to build vehicle system dynamic model with the rigid car body replaced by the flexible car body. Due to the lower structure natural vibration frequency of car body, the influence of carbody flexibility on vehicle system dynamic performance is more influential. The influences of structural vibration of car body on vehicle system dynamics performance were studied by finite element analysis (FEA) method and multi-body system (MBS) dynamics theory. Rigid-flexible coupled vehicle system dynamic models were built up and the car body key location’s vibration was analyzed through vibration transmission chain. The results show that the influences of high speed carbody structure vibration on vehicle system dynamics performance are distinguished especially in the domain of car body natural vibration frequency.

scholarly journals Numerical Investigation into the Critical Speed and Frequency of the Hunting Motion in Railway Vehicle System

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Jianfeng Sun ◽  
Maoru Chi ◽  
Wubin Cai ◽  
Xuesong Jin
Keyword(s):  
High Speed ◽  
Critical Speed ◽  
Dynamic Performance ◽  
Decisive Role ◽  
Creep Model ◽  
Railway Vehicle ◽  
Sudden Increase ◽  
Nonlinear Creep ◽  
Vehicle System ◽  
Hunting Frequency

The critical speed and hunting frequency are two basic research objects of vehicle system dynamics and have a significant influence on the dynamic performance. A lateral dynamic model with 17 degrees of freedom was established in this study to investigate the critical speed and hunting frequency of a high-speed railway vehicle. The nonlinearities of wheel/rail contact geometry, creep forces, and yaw damper were all considered. A heuristic nonlinear creep model was employed to estimate the contact force between the wheel and the rail. The Maxwell model, which covers the influence of the stiffness characteristic, is used to simulate the yaw damper. To reflect the blow-off of the yaw damper, the damping coefficient is described by stages. Based on the mathematical model, the combined effects of vehicle parameters on the critical speed in the straight line and hunting frequency of the wheelset were investigated innovatively. The novel phenomenon that the hunting frequency exhibits a sudden increase from a smaller value to a larger value when the blow-off of the yaw damper occurs was discovered during the calculations. The extents to which various parameters affect the critical speed and hunting frequency are clear on the basis of the numerical results. Moreover, all of the parameter values were divided into three sections to determine the sensitive range for the critical speed and hunting frequency. The results show that the first section of values plays the decisive role on both the critical speed and the hunting frequency for all parameters analyzed. The investigation in this paper enriches the study of hunting stability and gives some ideas to probably solve the abnormal vibrations during the actual operation.

Nonlinear stability analysis of motor bogies for high-speed trains

2018 ◽  
Vol 233 (9) ◽  
pp. 885-895
Author(s):  
Kun Xu ◽  
Jing Zeng ◽  
Cai-Hong Huang
Keyword(s):  
Nonlinear Stability ◽  
High Speed ◽  
Dynamic Performance ◽  
Nonlinear Stability Analysis ◽  
Normal Form Theory ◽  
Traction Motor ◽  
Critical Speeds ◽  
Suspension Parameters ◽  
High Speed Trains ◽  
Linear And Nonlinear

The traction motor flexibly suspended on the bogie frame is conducive to the lateral dynamic performance of high-speed trains. At present, most of the researches about the influences of suspension parameters of the traction motor on the stability of the bogie are limited to the linear system. In this paper, according to the suspension mode of the traction motor of a certain type of high-speed train in China, the dynamic equations of the motorized bogie with eight degrees of freedom are derived, and the nonlinear stability of the bogie system is analyzed. The bifurcation diagrams of the bogie system with different motor suspension parameters are obtained by using the continuation algorithm, and the linear and nonlinear critical speeds of the system are studied. The study shows that the suspension stiffness, damping coefficient, and the mass of the motor significantly affect the critical speeds of the bogie system. Then the mechanisms of the influence of suspension parameters on the linear and nonlinear critical speeds of the bogie are analyzed by the root locus method and Hopf bifurcation normal form theory, respectively.

A Comprehensive Analysis and Solution for Traction Motor Speed Measurement in High Speed Train

2012 ◽  
Vol 253-255 ◽  
pp. 2052-2057
Author(s):  
Jin Qi Ren ◽  
Yao Hua Li ◽  
Qiong Xuan Ge ◽  
Xun Ma ◽  
Lu Zhao
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Speed Train ◽  
Motor Speed ◽  
Clock Period ◽  
Traction Motor ◽  
Speed Measurement ◽  
Speed Range ◽  
Update Rate ◽  
Hardware In Loop

In high speed train, to obtain precise speed is important to high performance control, though the transducers used in the train are usually low resolution. The speed measurement was analyzed both on precision and update rate according to the control requirement. A comprehensive measure and calculation solution for traction motor speed measurement is presented. Measure clock period is adjusted according to motor’s different speed range and can obtain good measurement precision both in low and high speed range. The speed update rate can also be guaranteed. The proposed method is implemented and validated by hardware in loop simulation system.

Integrated sliding mode and direct torque controls for improving transient traction in high-speed trains

2020 ◽  
pp. 107754632093202
Author(s):  
Iman Ferestade ◽  
Mehdi Ahmadian ◽  
Habibollah Molatefi ◽  
Bijan Moaveni ◽  
Vahid Bokaeian
Keyword(s):  
High Speed ◽  
Control Structure ◽  
Sliding Mode ◽  
Input Voltage ◽  
Open Loop ◽  
Motor Power ◽  
Traction Motor ◽  
Acceleration Time ◽  
Traction Motors ◽  
High Speed Trains

Wheel slip control in high-speed trains is used to reduce the acceleration time and produce the maximum traction motor power. For controlling slip in a complete model of a train consisting of the traction motors, it is needed to keep the adhesion coefficient as much as possible by controlling the input voltage. In this article, integrated sliding mode and direct torque controls are used to control the transient traction in a full model of a high-speed railcar consisting of a wagon, two bogies, four wheelsets, and four traction motors. Cosimulations in SIMPACK with MATLAB/Simulink are carried out to evaluate the performance of the designed control structure. By comparing the results of the open-loop and closed-loop simulations, it is shown the acceleration time of the high-speed railcar is decreased 26% and the production of the traction motor power is increased 32% for both dry and wet surface conditions. It is also shown that the designed control structure is stable and robust in the presence of uncertainties.

Inductor Saturation Compensation in Three-Phase Three-Wire Voltage-Source Converters via Inverse System Dynamics-I

2020 ◽  
Author(s):  
Ziya Özkan ◽  
Ahmet Masum Hava
Keyword(s):  
Dynamic Model ◽  
Dynamic Performance ◽  
Current Control ◽  
Inverse System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Two Phase ◽  
Inverse Dynamic ◽  
Three Phase ◽  
Steady State Current

In three-phase three-wire (3P3W) voltage-source converter (VSC) systems, utilization of filter inductors with deep saturation characteristics is often advantageous due to the improved size, cost, and efficiency. However, with the use of conventional synchronous frame current control (CSCC) methods, the inductor saturation results in significant dynamic performance loss and poor steady-state current waveform quality. This paper proposes an inverse dynamic model based compensation (IDMBC) method to overcome these performance issues. Accordingly, a review of inductor saturation and core materials is performed, and the motivation on the use of saturable inductors is clarified. Then, two-phase exact modelling of the 3P3W VSC control system is obtained and the drawbacks of CSCC have been demonstrated analytically. Based on the exact modelling, the inverse system dynamic model of the nonlinear system is obtained and employed such that the nonlinear plant is converted to a fictitious linear inductor system for linear current regulators to perform satisfactorily.

Dynamic Performance of High-Speed Electric Multiple Unit within Multi-Body System Simulation

2019 ◽  
Vol 12 (4) ◽  
pp. 339-349
Author(s):  
Junguo Wang ◽  
Daoping Gong ◽  
Rui Sun ◽  
Yongxiang Zhao
Keyword(s):  
High Speed ◽  
Rapid Development ◽  
Dynamic Performance ◽  
Body System ◽  
High Speed Railway ◽  
Evaluation Indexes ◽  
Actual Operation ◽  
Multiple Unit ◽  
The Stability ◽  
Multi Body

Background: With the rapid development of the high-speed railway, the dynamic performance such as running stability and safety of the high-speed train is increasingly important. This paper focuses on the dynamic performance of high-speed Electric Multiple Unit (EMU), especially the dynamic characteristics of the bogie frame and car body. Various patents have been discussed in this article. Objective: To develop the Multi-Body System (MBS) model of EMU, verify whether the dynamic performance meets the actual operation requirements, and provide some useful information for dynamics and structural design of the proposed EMU. Methods: According to the technical characteristics of a typical EMU, a MBS model is established via SIMPACK, and the measured data of China high-speed railway is taken as the excitation of track random irregularity. To test the dynamic performance of the EMU, including the stability and safety, some evaluation indexes such as wheel-axle lateral forces, wheel-axle lateral vertical forces, derailment coefficients and wheel unloading rates are also calculated and analyzed in detail. Results: The MBS model of EMU has better dynamic performance especially curving performance, and some evaluation indexes of the stability and safety have also reached China’s high-speed railway standards. Conclusion: The effectiveness of the proposed MBS model is verified, and the dynamic performance of the MBS model can meet the design requirements of high-speed EMU.

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