Showing papers by "Herman Van der Auweraer published in 2015"

Study of torque ripple and noise for different rotor topologies of a synchronous reluctance machine

Abstract: The use of electric machines as traction in electric vehicles raises the concern of the vibration and the noise level generated by the structure. Radial forces in the stator of electrical machines have a high contribution to these vibrations. This paper presents a coupled finite element method (FEM) for calculating the radial force, torque ripple and predict the acoustic noise in synchronous reluctance machines (SynRMs). The knowledge of the modal parameters of the stator structure (mode shapes and natural frequencies) and the frequency spectrum of the radial magnetic force can be effectively used to design SynRMs with minimal noise through geometrical design variations at an early stage. An automatic process has been developed for designing a synchronous reluctance machine, to enable faster implementation of the geometry modifications and investigation of electromechanical properties while regarding also the problems related to noise. The practicality of the automation is demonstrated on modifying the rotor geometrical design for a SynRM that would apply for traction of small electric vehicles. The effect of the stator geometry or winding distribution on acoustic noise can also be analyzed with the model presented in this paper.

Real-time co-simulation platform for electromechanical vehicle applications

Abstract: Simulating components of hybrid and electric vehicle drivetrains present new challenges for development processes and tools. This paper describes a Model Based Design (MBD) approach for these particular vehicle applications. Advantages of this approach are reduction of development time and cost, faster and easier testing, reduction of failures, etc. More in detail, the following paragraphs deal with the real-time system modeling and virtual prototyping, the different validation stages of a component development process and the corresponding experimental setup to perform real-time tests. Finally, detailed results are shown for a Model-in-the-loop (MiL) and a Hardware-in-the-loop (HiL) simulation.

Experimental noise and vibration analysis of switched reluctance machines comparison of soft and hard chopping in transient conditions

Abstract: This paper presents a comparison of soft and hard chopping on an 8/6 SRM in terms of noise, vibration and harshness. Transient-state measurements are used to plot speed-frequency signatures of current, vibration and acoustic noise of the SRM for different load torques. With this technique speed-related frequencies can be distinguished from resonance frequencies, and therefore, more information can be extracted from the plots. The results show that hard chopping increases the loudness of acoustic noise compared to soft chopping, with a frequency shift to higher values. This however leads to an attenuation of the vibration and noise amplitudes at the most critical resonance of the SRM, situated at a relatively low frequency.

Automatic generation of simulation models for early stage evaluation of physical system topologies (WIP)

Abstract: Nowadays, simulation tools cannot describe architectural variability. As such, they are mostly only used during the later stages of the design, when the architecture has already been fixed. This paper demonstrates how simulation tools can still be used in the early stages of physical system design before the system architecture is fixed, by using automatic generation of simulation models.The paper classifies the approaches to automatically generate and execute simulation models according to different criteria and explains how one can choose a suitable approach given particular criteria. Additionally, it describes some best practices for using simulation tools within optimization loops.

Torque Ripple and Nois nt Rotor Topologies of nous Reluctance Mach

Abstract: The use of electric machines as vehicles raises the concern of the vibration generated by the structure. Radial force electrical machines have a high contribution This paper presents a coupled finite element calculating the radial force, torque rippl acoustic noise in synchronous reluctance m The knowledge of the modal parameters of (mode shapes and natural frequencies) a spectrum of the radial magnetic force can be design SynRMs with minimal noise through variations at an early stage. An automati developed for designing a synchronous relu enable faster implementation of the geometry investigation of electromechanical properti also the problems related to noise. The automation is demonstrated on modifying th design for a SynRM that would apply for electric vehicles. The effect of the stator ge distribution on acoustic noise can also be model presented in this paper. traction in electric and the noise level es in the stator of to these vibrations. t method (FEM) for le and predict the machines (SynRMs). the stator structure and the frequency e effectively used to h geometrical design c process has been uctance machine, to y modifications and ies while regarding practicality of the he rotor geometrical r traction of small eometry or winding analyzed with the

Two methods of generating random excitations with increased kurtosis for in-house testing of vehicle components

Abstract: Random vibration testing with increased kurtosis introduces realistic high peaks into shaker drive signals. This is required for more accurate simulation of land vehicle vibrations. Two methods of controlling kurtosis by manipulation of the IFFT phases were developed, tested, and compared. The first method generates high-kurtosis excitations with random noise pattern and the second method produces peaks shaped in the form of an impact response superimposed on random vibration background such as when a vehicle moves over a distinctive irregularity on the road or rail track.