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This research analyzes the vibration phenomenon in certain types of fractional slot permanent magnet synchronous machines that excites low order radial forces. The study utilizes a motor topology from the group having 12-stator slots and 10-rotor poles (12s10p) to identify and propose several design-based solutions to reduce vibration. Some electromagnetic design feature variations in the motor geometry...
This paper presents an evaluation of noise and vibration in a distributed winding permanent magnet synchronous motor driven by voltage source pulse width modulation (PWM) inverters. The permanent magnet synchronous motor (PMSM) is widely used as an important driving source in a variety of fields. However, it generates electromagnetic noise and vibration because of PWM inverters. This paper describes...
This paper investigates the influence of converter-fed operation on magnetic forces and radial vibration in a hydrogenerator. Flux density distribution is computed using time-stepping finite element (FE) analysis and used to calculate force density distribution based on Maxwell stress tensor. Both temporal and spatial characteristics of selected flux density and force density waves are studied. Important...
With the development of electric vehicles, more and more attentions have been put on understanding and attenuating the noise, vibration, and harshness (NVH) of traction machines. NVH in machines are mainly caused by the electromagnetic force, which is complex vector functions of both time and space, and models are desired for accurately evaluating its characteristics. In this paper, analytical models...
Electric vehicles (EVs) have attracted growing interests worldwide because of their advantages of zero emission, low noise and energy saving. Fractional slot interior permanent magnet synchronous motors (IPMSMs) are attractive for EV applications due to their high power density and high efficiency. However, the fractional-slot IPMSMs normally suffer large vibration noise induced by the abundant harmonics...
The aim of the present paper is to diagnose the mechanical faults in induction motors. We have chosen this part in order to contribute to the diagnosis of electrical machines. The raising of stator current allows detecting the fatigue of the machine failure. The manner of the treatment decides the efficiency of the applied technique. We have examined the static eccentricity fault by a vibration signal...
This paper introduces a novel method of measuring vibration displacement using three axes accelerometer, which effectively overcomes the shortcomings of traditional measurement method based on single axis accelerometer. Firstly, the frequency domain method is used to remove the trend items and noises in the three axes acceleration signals. Then, the three axes accelerations are fused for the resultant...
This paper compares the air gap field, magnetic radial force and vibration between SPM and IPM machines having 6-pole/54-slot winding topology together with the identical stator but different rotor topologies. A simplified analytical method is analyzed and its results are validate by Finite element method. It is shown that the vibration of the IPM is much higher than that in SPM when motor is in on-load...
This paper characterises vibration signals using modulation signal bispectrum method in order to develop an effective and reliable feature sets for detecting and diagnosing faults from both the bearings and impellers in a centrifugal pump. As vibration signals contain high level background noises due to inevitable flow cavitation and turbulences, effective noise reduction and reliable feature extraction...
The modal truncation problem of non-classically damped systems is constantly encountered in the dynamic analysis of engineering. The present study is designed to calculate the frequency response functions of the non-classically damping systems accurately on account of the Neumann expansion theory and the frequency shifting technique. Considering the first and the second term influence of the Neumann...
The development of Condition-Based Maintenance and Prognostics and Health Management systems can be fostered by models that accurately reproduce the effects and propagation of faults. Conventional methods applied to the analysis and simulation of rotor asymmetries in induction machines are based in the classical 2-D finite element approach, which is unable to reflect its complex effects, such as interbar...
The radiated acoustic noise from a traction motor at low speeds is dominated by the noise of electromagnetic origin. For a motor operated from pulse width modulated (PWM) converters, the switching frequency of the converter will have a large impact on the noise. The total harmonic distortion of the motor phase currents and thus also the exciting forces, will decrease with increasing switching frequency...
Bearing fault diagnosis in induction motors is an open field of research. The use of the stator current to monitor the bearing condition has some advantages over other signals such as vibration and acoustic emission, but it has proven to be less effective than for another kind of faults. This paper proposes to overcome these difficulties by an automatic classifier that uses a significant amount of...
This research analyzes two stator design features as structural solutions to reduce noise and vibration in permanent magnet synchronous machines (PMSM). The study was focused on a surface mounted PMSM with 12-stator slots and 10-rotor poles where vibration is a well-known issue. The structural-harmonic analysis was used to quantify the vibration by analyzing the radial deformation and acceleration...
The analysis of the vibration response of electrical machines has importance in noise prediction and more recently, fault diagnosis. This work presents a strongly coupled 2-D magnetomechanical simulation of an induction machine under heavy operational conditions: a direct-on-line startup. Both healthy and broken bar states are simulated in a time span long enough to allow the detailed study of the...
Vibrational anharmonicity in molecular solids is of key importance for fundamental physical properties such as thermal expansion and specific heat capacity. In solids, anharmonic character is largely dictated by intermolecular forces, and can be assessed using terahertz vibrational spectroscopy to probe the sub-100cm−1 motions. Significant anharmonicity can be readily identified by anomalous red shifting...
The paper describes the usage of the electrical power steering (EPS) motor as an actuator to perform active noise cancellation in passenger cars. Therefore, the existing field oriented controller for the motor current is modified and the demanded currents required for the power steering are superimposed with additional signals e.g., sinusoidal signals with frequencies of 50–500Hz that generate vibrations...
Increasing levels of noise and vibration are early indicators for an evoluting error or defect on an electrical machine. There are many different approaches in monitoring the health of an electrical machine, e.g. noise-, vibration- or current-based methods. This paper investigates and compares different methods for noise analysis. Each method provides an own representation of the analysed signal....
This paper investigates the flux density and radial force spatial harmonics in large salient pole synchronous hydro-generators. Vibration due to magnetic forces are mainly caused by low order harmonics in the airgap flux density distribution. The influence of winding layout and airgap length on the lowest order radial force component are analysed. Airgap flux density and radial force density distributions...
This paper provides a detailed investigation of the influence mechanism on vibration and noise of permanent magnet synchronous motors with skewed stators. Several skewed stator structures are researched to show the features of the flux and force. The finite element method is used to analyze the motor vibrations, displacements of deformation, and modals considering the mechanism of skewed stator. The...
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