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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 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...
Aiming at the problem of existing larger speed fluctuation when the variable frequency air conditioning compressor running at low frequency, the reason of speed fluctuation in the low speed range for compressor is analyzed thoroughly in this paper, a speed fluctuation suppression strategy for the air conditioning compressor is proposed. Firstly, the periodic speed pulsation of compressor is reduced...
This paper presents a method for controlling torsional vibrations in rotating machines with nonlinear dynamics. The work is motivated by rotating machines with cam or crankshaft mechanisms that generate harmonic signal components in the angular speed with respect to the rotation angle. In the system description, the torsional vibrations are modeled as disturbances acting upon a linear plant. Thus,...
Feedforward control is widely used in industrial robot as a valid control method. High speed motion will bring the vibration for robot with flexible joints, which will affect the dynamic performance of robot. The residual vibration character is analyzed for palletizing robot using feedforward control method in this paper. Considering the vibration suppression constraints polynomials fitting method...
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,...
Switched reluctance machines have the drawback of a high acoustic excitation. This paper presents an acoustic optimization method that analyzes the signal of a vibration sensor in the control loop and is able to eliminate mode-0 borne vibrations. A search algorithm which determines the optimized control parameters is proposed. The potential of the control concept is described including measurement...
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...
In this paper, the open-loop control for permanent magnet synchronous motor (PMSM) driven by a square-wave voltage is proposed. The proposed control is able to transit from the PWM region to the square-wave voltage region via the over modulation region seamlessly. When the PMSM is driven by the square-wave voltage using the proposed control, the low-frequency torque vibration except 6th or 12th order...
Torsional vibration issues in elastic drive systems are a well-known topic both in the research area and in the industrial field. A considerable number of papers appear over the last two decades discussing the source of torque and speed ripple in variable speed drive (VSD) technologies and their connection with the mechanical characteristics as the torsional natural frequencies (TNFs). This paper...
This paper proposes a differential evolution (DE) optimization-based current profiling method for simultaneous reduction of the torque ripple and vibration of switched reluctance motors (SRMs). The mechanism of torque generation in SRMs produces radial forces in addition to the required tangential force. It has been shown that the radial forces acting on the stator are the main vibration source in...
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...
The characteristic of radial electromagnetic force and torque ripple of permanent magnet assisted synchronous reluctance motor (PMSynRM) under load condition was analyzed; considering to minimize the radial electromagnetic force and torque ripple, An effective and detailed method of suppressing vibration of PMSynRM was proposed. The validity of the proposed method is confirmed by both simulated and...
This paper presents a method for generating stator currents supplying a surface permanent magnets synchronous motor with lack of turns in one of its winding. The currents are calculated in order to minimize the torque ripple generated by the dissymmetry. The analytical model used is based on the role of the space harmonics of the stator and rotor flux density on generation of torque harmonics. This...
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...
Many mechanical faults in industrial processes are related to bearing damage, which can be detected by vibration analysis. This approach may be expensive due to the cost of sensors. Therefore, studies are performed in order to use the stator current to detect bearing damage. This study is to investigate the impact of the load in the bearing damage detection by using the stator current. A diagnostic...
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.
Flux-Switching machines (FSM) have been gaining attention during the last decade. Their electromagnetic behavior has been extensively studied for various topologies, i.e. U-core and E-core, simple (wound field or PM) and hybrid excitations FSM machines. Even though noise and vibrations of electromagnetic origins can be important drawbacks, depending on the application, only few studies are analyzing...
The switched reluctance motor is a good candidate for electrical traction and more specifically in automotive applications. The conventional switched reluctance motor presents two major drawbacks which are torque ripple and stator vibrations. In this work, a solution to limit these problems is proposed: a switched reluctance motor with magnetic slot wedges is used to reduce the impact of vibrations...
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