I. IntroductionNetwork simulation has become more important for EMC analysis of conducted disturbances in power electronics over the last years. However, accurate models for the EMI frequency range from 10kHz up to 30MHz are rare and in most cases it is very difficult to obtain the appropriate model parameters. Furthermore, simulation time becomes more and more critical, if EMI phenomena of the whole power electronic system have to be investigated. Therefore, a good compromise between simulation time and model accuracy need to be found. Frequency domain simulations have been established for that task because of its high simulation speed even with complex models. On the other hand nonlinear behaviour of disturbance sources cannot be modeled in frequency domain [3]. Thus, time domain simulation is advantageous for certain simulation problems.Models for induction machines as a part of the EMI noise path have been presented by different authors. Weber has presented an exact model for frequency domain simulation [5] which is a further development of a proposed model by Zhong [6]. This model applies frequency dependent parameters and has high component count which leads to extensive simulation times. Thus, it is not useful for time domain simulations even when dependencies on the frequency are neglected. High frequency models of induction machines for time domain simulations have not been developed up to a comparable accuracy or they are not suitable to simulate both common mode (CM) and

From the EMC point of view, the integration of electric drive systems into today's cars represents a substantial challenge. The electric drive system is a new component consisting of a high-voltage power source, a frequency converter, an electric motor and shielded or unshielded high-power cables. Treating this new electric drive system or its components as a conventional automotive component in terms of EMI test procedures and emission limits would lead to substantial incompatibility problems. In this paper, the EMC issues related to the integration of an electric drive system into a conventional passenger car are investigated. The components of the drive system have been analyzed being either noise sources or part of the coupling path within the new electrical system of the car. The obtained results can also be used to determine the acceptable noise levels on a high voltage bus of an electric drive system

EMC-analysis of power electronic systems is strongly supported by network simulations. Simulations at the system level provide not only the prediction of EMI but also deep insight into the EMC relevant effects. To model the system properly, it is necessary to model source and target of EMI and also all parts of the coupling paths. EMI-filters can be designed efficiently using network based modeling approaches. In this paper a model for induction machines' EMC behaviour simulation is parameterized in the frequency range from some kHz up to 100 MHz. The high-frequency characteristics of induction machines with power ratings from 370 W up to 45 kW are compared and a model library is set up for both, frequency and time domain

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So far, methodical design of EMI filters for power electronic applications fails, because coupling among the filters' components is not predicted accurately. A method of calculating coupling with EMI capacitors is presented. The method is verified by experimental results. The presented results prove the possibility of simulating field coupling in circuits including the circuit's components. In particular, when miniaturizing power electronic devices, the calculated coupling among conductors and components must be taken into account to ensure EMC at the system level