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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...
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...
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...
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...
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...
In this paper, rotor slits on the rotor's outer circumference is adopted to reduce certain harmonic components of radial forces and, hence, acoustic noise and vibration in an interior permanent magnet synchronous machine (IPMSM). The 48th order of harmonic component for the radial force is found to be responsible for the noise and vibration problem in the studied motor. For this purpose, the influential...
A radial composite ultrasonic motor is proposed in this paper. The configuration and the working principle of the motor are presented. Finite element model of the stator is developed and the dynamics of the stator are simulated based on modal analysis and harmonic analysis. A prototype of the stator is fabricated. The impedance-frequency characteristic and the radial vibration amplitude stimulated...
In this work we discuss the efficiency of various stator current signatures for monitoring shaft misalignment that could affect mechanical systems when driven by an induction machine speed-controlled. In that respect, we have considered the Motor Current Signature Analysis, the Current Space Vector, and the Current Park Loci, under no-load as well as under full load conditions. On the other hand,...
Abstract-Flux-switching permanent-magnet (FSPM) motors are been studied as a promising candidate for many industrial applications, but they suffer from vibration and acoustic noise of electromagnetic origins. This paper proposes a new five-phase fault-tolerant FSPM motor in order to reduce vibration and acoustic noise, which has double fault-tolerant teeth on stator. By cutting down the lowest harmonic...
Recently, research concerning condition monitoring and fault diagnosis of electrical machines have experienced extraordinarily dynamic activity. The increasing importance of these energy conversion devices and their widespread use in uncountable applications have motivated significant research efforts. Various faults are occurring in the stator as well as in the rotor of 3-phase squirrel cage induction...
Recently, research concerning condition monitoring and fault diagnosis of electrical machines. The increasing importance of these energy conversion devices and their widespread use in uncountable applications has motivated significant research efforts. Various faults are occurring in the stator as well as in the rotor of 3-phase squirrel cage induction motor such as bearing fault, broken rotor bar...
In this paper the external stray flux around a motor has been investigated as a possible new diagnostic instrument to detect generalized roughness. This very common bearing fault has been slightly considered in the literature so far. Stray flux was measured by two probes, one commercially available and one realized in laboratory; the diagnostic content of both signals has been compared also with the...
In this paper, current command to reduce noise and vibration of switched reluctance motors have been investigated. Noise and vibration were reported to be significantly reduced by making a radial force sum as flat as possible with current profiling. In order to realize flat radial force sum, dc, fundamental, and second harmonic components were required. The dc and fundamental components are determined...
This paper discusses the effect of the operating load as well as the suitability of combined startup and steady-state analysis for the detection of bearing faults in induction machines, Motor Current Signature Analysis and Linear Discriminant Analysis are used to detect and estimate the severity of an outer race bearing fault. The algorithm is based on using the machine stator current signals, instead...
This paper presents an application based on higher order spectra (HOS) for fault pattern extraction of induction motors. The focus was put on one of major HOS measures, the bispectrum in particular. The bispectrum is the third-order frequency domain measure, which contains information that conventional spectral analysis techniques cannot provide. A series of experiments for fault diagnosis of induction...
Permanent magnet synchronous motors (PMSMs) with salient rotor structure are attractive in the applications where high power density and high efficiency is of importance[1]. However, with the increasing of power density and rotating speed, acoustic noise and vibration problem [2] caused by electromagnetic (E.M.) force wave is very serious. But, the existing literatures [3-4] mainly research the non-salient...
Detection of faults in AFPM generators is important as they become increasingly deployed in wind turbines. Hence, this paper describes the techniques developed for implementing and diagnosing eccentricity faults in an axial-flux permanent magnet (AFPM) wind generator. The main features of the system are related to ease and correctness of the fault implementation, isolation of faults, in-situ capability...
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