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The thrust and levitation force of the long stator linear synchronous motor (LSLSM) are key points to evaluate the performance of the maglev train. However, it is not easy to be achieved due to the non-linear and dynamic coupling characteristics between thrust and levitation force. In this paper, the finite element analysis model of long stator linear synchronous motor is built for analyzing the thrust...
A tubular flux-switching permanent-magnet linear machine (PMLM) is proposed and designed for free-piston energy converter. The influences of several main structure parameters on the machine performances are investigated. The power, power density and efficiency are improved by optimizing the structure parameters. Further, characteristic of the detent force is studied and the detent force is reduced...
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...
This paper studies the magnetic stress and vibration characteristic of the permanent magnet assisted synchronous reluctance machine (PM-SynRM). Firstly, the frequency and spatial orders of radial stress are investigated by analytical equations. Then, two PM-SynRMs are designed, and their open-circuit and armature magnetic stresses are calculated by finite element method (FEM) and compared with the...
In this paper, a segmented-stator linear vernier permanent magnet machine (LVPMM) is proposed for syringe pump systems. The proposed machine adopts segmented-stator linear vernier machine configuration. The mover is sandwiched between the segmented stators. By using the sinusoidal shaped magnets, the harmonics of the back electromotive force is reduced. By selecting an appropriate slot-pole combination...
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...
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...
Electromagnetic acoustic noise from electrical machines has increasingly become an area of attention for both academia and industry. In electric propulsion systems, this is a main contributor to the total acoustic noise and it is usually perceived as annoying due to its tonal appearance. This paper presents an alternative rotor design for a permanent magnet synchronous machine with the objective to...
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...
Linear oscillating motor provides short-stroke reciprocate motion with high efficiency and long lifespan, receiving much attention, especially in aerospace applications. LEHA is a novel flight actuation system, in which linear oscillating motor plays an important role. Thus, high output performance of LEHA relies on detailed researches into dynamics of linear motor. In this study, dynamics model is...
This paper presents an analysis of the air gap radial Maxwell forces in some three-phase, inner rotor Concentrated Winding surface Permanent Magnet Synchronous Machine (CW-PMSM). Two modular winding machines and one asymmetric, winding machine are considered and simulated by a Finite Element method (FE). The air gap Maxwell pressure results from multiplication of the flux density harmonics due to...
To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex modeling of machine's behavior in case of eccentrically placed rotor. The life time of machine's bearing becomes very important issue of...
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...
Since the expansion of renewables in Germany, a fast start-up of turbine generators increases in importance to compensate load peaks and reactive power. Therefore, the machines need an excitation field at standstill. Conventional brushless excitation systems consist of two different synchronous machines, which are not able to provide currents to the rotating part of the generator without rotational...
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...
This paper deeply discusses the effect of eccentricity, including static, dynamic and mixed eccentricity on the performance of FSCW SPM servo motor analytically and using finite element analysis (FEA) to validation. The effect of different kinds of eccentricity on magnetic field including magnet field and armature reaction field is described with three factor called modulation factor. The frequency...
Noise and vibration of permanent magnet synchronous machines (PMSM) are one of the important targets using to estimate motor operation performance. Therefore, if effectively identify the source of noise and vibration of PMSM, it could be taken some appropriate measures to suppress the noise and vibration of the motor. This article will take surface-mounted permanent magnet synchronous motor as the...
Basic principles of a new type of induction motor, called Variable Impedance (Z) Induction Motor (VZIM), are introduced. The main goal of implementing this new structure of induction motors is to counteract the existing compromise in the design stage of induction motors between high starting torque at standstill and high breakdown torque and high efficiency at rated speed by combining these features,...
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