Mathieu Sarrazin

Electromagnetic and Structural Analysis for a Surface-Mounted PMSM Used for Light-EV

This paper presents the performances of a surface-mounted permanent-magnet synchronous machine (SM-PMSM) from the electromagnetic and structural analysis point of view, which are evaluated numerically and through tests. The goal is to evaluate the possibility to use this SM-PMSM for the propulsion of a light-electric vehicle (L-EV), knowing that on one hand it has the best power density and, on the other hand, a torque wave with high ripples induces vibration and noise. This paper discusses the limits and the advantages for such a propulsion solution in order to evaluate its suitability for the L-EV applications.

Characterizing the motorization of a light electric vehicle through FEM and NVH tests

The purpose of the paper is to present the summary of results related to the characterization of the motorization of a light electric vehicle (L-EV). This analysis is made based on both a numerical approach, by using the electromagnetic as well as structural dynamics finite element method (FEM), and an experimental approach evaluating the noise, vibration and harshness (NVH) behavior.

NVH analysis of a 3 phase 12/8 SR motor drive for HEV applications

In this study different noise and vibration measurements on a multi-phase 12/8 switched reluctance (SR) motor for automotive applications are carried out on a test rig and analysed with vibro-acoustic techniques. When evaluating the behaviour of rotating machinery for HEV applications, it is necessary to perform a vibro-acoustic analysis. The reason for this is that these specific noise and vibration contribute significantly to the perceived overall sound quality in the passenger compartment and outside the vehicle. Vibrations or high frequency tonal acoustic noise could be annoying for the passengers or could even cause long term damage. Therefore, the noise and vibration must be deliberately optimized. In case of a SR motor, the radial magnetic force between stator and rotor is a main excitation source to create large deformations of the stator housing, causing serious vibrations and acoustic noise. Measurements and results of simulations in different load conditions are compared. In addition, the dominant vibration modes are verified by modal analysis and operational deflection shapes. The unpleasant tonal acoustic radiation of this electric motor is objectively quantified by noise metrics. Finally, the relationship between the current profiles, radial magnetic forces, and mechanical and acoustic vibrations is investigated to obtain a better insight into the root cause of the vibro-acoustic behaviour of the motor.

Real-time co-simulation platform for electromechanical vehicle applications

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.

Signature analysis of Switched Reluctance and Permanent Magnet electric vehicle drives

The paper discusses the advanced spectral analysis performed on two important classes of electric drive systems, namely Switched Reluctance Motors (SRM) and Permanent Magnet Synchronous Machines (PMSM). In particular, the noise and vibration signatures as a function of operating speed are analyzed by using a waterfall analysis and an order analysis. The harmonic and modulation components attributable to the motor configuration, the motor operating principles and the Variable Speed Drives (VSD) are identified in two cases for each motor type. Furthermore, a number of approaches to improve the noise and vibration performance have been evaluated, in particular by acting on the controls of the variable speed drive. Some comments on additional noise source phenomena such as caused by phase unbalance are given.

Model-based design and testing for electric vehicle driveability analysis

In this paper a model-based design and testing method focusing on the electric vehicle driveability aspect is proposed. The design approach is divided into two steps. The first step is the Model-in-the-Loop co-simulation coupling a vector-controlled electric drive modelled in MATLAB/Simulink to a planar forward-facing electric vehicle LMS Imagine. Lab Amesim model. The second step represents a mechanical-level Hardware-in-the-Loop test for a physical electric drive that integrates the electric vehicle model in the real-time testing case. Two different sampling times of the vehicle control unit are considered and their influence on the vehicle responsiveness and on the longitudinal jerk acting on the driver is analysed through both offline simulation and real-time testing.

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

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.

Noise and vibration behavior and analysis conditions of a 45kW induction motor

A medium power induction motor (IM), of 45kW, is under study and the main results in terms of noise and vibrations are presented here. Several operating conditions will be verified as well as their influence on the structural behavior of the IM. The IM is considered to be capable to assure the propulsion of an electric car, which involves specific constraints. Thus, the tests were performed on a driving cycle and the main measurements are depicted here to prove the noise and vibration behavior of the studied motor.