The new generation of electric locomotives is equipped with asynchronous traction motors., When these motors are fed with non-sinusoidal voltage, the skin effect in the rotor bars modifies the behaviour of the traction system. A mathematical model of a squirrel-cage induction motor is presented in this article. It considers skin effect in rotor bars for frequencies up to about 1500 Hz. The main idea is to represent the rotor bars as a lumped network of resistances and inductances.
The model is part of a complete simulation program for a full-power main line locomotive.It is used for a more accurate investigation of copper losses and torque pulsations in the motor.
Theinvestigations have been conducted at the Royal Institute of Technology, Stockholm, using a simulation language suitable for studying the dynamics of systems.
Current limitations of battery systems for fully electric vehicles (FEV) are mainly related to performance, driving range, battery life, re-charging time and price per unit. New cell chemistries are able to mitigate these drawbacks, but are more prone to catastrophic failures due to a thermal runaway. Therefore, new and more advanced management strategies are necessary to safely prevent the energy storage system from ever coming into this critical situation. In this paper, a novel battery management system (BMS) architecture is introduced, which will be able to meet these high requirements by introducing a network that has smart satellite J. Langheim (&) Á S. Carcaillet Á P. Cavro
After a short introduction into the project of an electrically driven citybus with two individual induction machines, this paper describes the power electronic hardware including IGBT‐inverter and on‐board supply system as well as the structure of the field‐oriented motor control. The on‐board power supply has been especially designed for this vehicle. It supplies electric loads such as board systems, measurement devices and control components. The induction machines are separately fed by two ICBT‐inverters. They are operated at a high switching frequency due to the low leakage inductance of the machines. Fast switching leads to high dU/dt‐values which may destroy the motor windings. In order to reduce the high dU/dt‐stress on the machines, an appropriate circuit has been developed and is presented. The induction machines are controlled by a field oriented control. The choice of the reference current components and the control structure assure a good dynamic performance and low machine losses. Measurements obtained in a laboratory test‐setup are presented.
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