Dimitri Torregrossa

Prediction of Acoustic Noise and Torque Pulsation in PM Synchronous Machines With Static Eccentricity and Partial Demagnetization Using Field Reconstruction Method

Permanent magnet synchronous machines (PMSM) are widely used in industrial applications. Partial demagnetization and static eccentricity are among common faults in PMSM. These faults will alter the acoustic behavior and torque pulsation by a significant margin. In this paper, results of a thorough investigation on the impact of these faults on the force distribution, vibration, and acoustic behavior of the PMSM is presented. Our force analysis is based on the field reconstruction method which is a very efficient technique for multi-physics field problems in electromechanical energy converters.

Multiphysics Finite-Element Modeling for Vibration and Acoustic Analysis of Permanent Magnet Synchronous Machine

This paper aims to describe a numerical modeling process for estimating the electromagnetic noise radiated from a permanent magnet synchronous machines. The original contributions concern the inclusion of a complete evaluation of the electromagnetic forces acting on the stator teeth, a complete 3-D structural finite-element model and a point wise approximation for acoustic calculation. Structural and acoustic responses of the targeted machine have been derived and validated using experiments. Superior precision of the proposed method has been substantiated through experiments.

Fast Computation of Electromagnetic Vibrations in Electrical Machines via Field Reconstruction Method and Knowledge of Mechanical Impulse Response

The main objective of this paper is to provide an efficient computational model for fast and accurate calculation of electromagnetically induced vibrations in electrical machines. Although a three-phase permanent-magnet synchronous machine has been used in this paper, the same methodology can be extended to other types of electric machinery. A brief comparison between the different methods for structural analysis in electrical machines is introduced. The method proposed in this paper uses finite-element analysis in order to extract the impulse responses that are used in calculating the vibration. A field reconstruction method is used for the electromagnetic field analysis.

Active Mitigation of Electromagnetic Vibration Radiated by PMSM in Fractional-Horsepower Drives by Optimal Choice of the Carrier Frequency

A novel approach to quickly evaluate the electromagnetic vibration emitted by a permanent-magnet synchronous machine in A fractional-horsepower drive is detailed. Field reconstruction method and mechanical impulse response are used. The impulse response for rapid evaluation of vibrations at critical points is used after the design of a torque and speed controller. The vibration obtained using a three-phase pulsewidth-modulation technique and nonclassic space-vector modulations are compared by simulation results. An optimal choice of the carrier frequency, by an optimization method, for the two modulation techniques allows for a 35% reduction of the vibration in the targeted machine under different operating conditions. The peak-to-peak force-magnitude reduction reaches 8%.

Forces and vibrations analysis in industrial PM motors having concentric windings

Industrial applications involving torque BLDC motors require high efficiency over a large speed range. In order to achieve such specifications, the flux weakening is necessary, which could lead to relative high mechanical vibrations and consequently to audible noise. Furthermore, to decrease cogging torque and to satisfy motor manufacturing constraints, concentric windings are usually considered. Such motor configurations lead to harmonics of the electromagnetic forces being the sources of mechanical vibrations. This paper focuses on the electromagnetic forces created in SMPM and IPM motors for two concentric windings: one and two coils per slot. These forces are determined using a lumped magnetic scheme and 2D FE simulations. 3D FE simulations permit to determine the mechanical modes and the acoustic power. The acoustic measurements confirm the analysis and the proposed improvement.

A New Passive Methodology for Reducing the Noise in Electrical Machines: Impact of Some Parameters on the Modal Analysis

This paper presents a 3-D finite-element modal analysis to reduce the acoustical power radiated by a brushless permanent-magnet synchronous machines and avoid any resonance phenomena. The method is able to analyze the impact of some design parameters on all the resonance frequencies for reducing the total sound power and gives some guidelines to their choice. A less noisy prototype has been analyzed in simulation without any acoustic calculation and then built and validated with experimental results.

A new passive methodology for controlling the noise in electrical machines: Impact of some parameters on the modal analysis

This paper presents an initial state of the art about the most important techniques for reducing noise in an electrical machine. The FEM 3D modal analysis (realized with the software Ansys 11.0) is then proposed to study and reduce the acoustical power radiated by a brushless machine and avoid any resonance phenomena. The method is able to analyze the impact of some design parameters on all the resonance frequencies for reducing the total sound power and gives some guidelines to their choice.

New Estimation of Electromagnetic Sound Power Radiated by a PM Machine: an Active and Passive Control Guideline

This paper presents an initial state of the art about the estimation of the sound power emitted by electrical machines. The paper proposes a new method, more accurate, to evaluate the sound power emitted by a PM machine by a 3D FEM mechanical analysis. It also takes into account tangential forces applied on the teeth. Finally the papers shows the impact of any harmonic force in the global emitted sound power in order to establish the most disturbing force. It proposes a guideline for active and passive noise control.

Detection of faults in PMSM using Field Reconstruction Method and Mechanical Impulse Response

A novel approach for quick evaluation of the electromagnetically induced vibration in a Permanent Magnet Synchronous Machine (PMSM) is introduced. Field Reconstruction Method (FRM) and Mechanical Impulse Response (MIR) are used for this purpose. The electromagnetic forces and vibration emissions are analyzed in time and frequency domain for healthy and faulty cases. These analyses allow for detecting specific properties of forces and vibration which are later on used for identifying various fault conditions. The proposed concept has been experimentally verified. Comparison of the vibration emissions for different operating conditions under various types of faults are presented as well.

Regressive Method for the Determination of Fuel Cell Pem Parameters in Order to Develop a Fuel Cell Pem Emulator

After a brief introduction about the polarization curve, this paper addresses a new method for correcting the values of measured voltages. By knowing this, it is possible to determinate, by a mathematical regression, the parameters allowing to describe the electrical behavior of a PEM fuel cell system. These parameters, obtained by experimental setup permit a fuel cell stack model to be obtained in order to construct its emulator. The emulator has been simulated and validated using Matlab Simulink.