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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...
Use of a rotor type UAV that can perform three-dimensional movement and hover is being actively pursued. Although a multi-rotor type UAV is important, because it is driven by electric motors its application has the limitation of a short cruising time. In this study, the composition and control system of a single rotor UAV that achieves attitude control by pivotable vertical fins are proposed. Herein,...
This paper analyzes power generation from sea waves by using power conditioning system and linear permanent magnet generator. A buoy is placed on the ocean surface and connected to the linear generator. The wave energy is carried out from the movement of a buoy. An electrical conversion system is needed between the generator and the grid. For an analysis of the power system, the modeling of the linear...
Linear hybrid excitation flux reversal machines are very attractive for low cost long stroke applications due to their simple and cheap secondary structure. This paper proposes a new hybrid excitation flux reversal machines with consequent-pole permanent-magnet arrays first. Owing to the adoption of consequent-pole permanent-magnet arrays, usage of permanentmagnet material of the proposed machine...
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...
This paper presents a reluctance-type limited-angle torque motor (LATM), which is used for actuator or arming device in the aerospace industry, and its electromagnetic (EM) characteristics were examined with respect to changes in the rotor pole angle and the rotational position of the LATM. Among the various shape design parameters of the LATM, changes in the rotor pole angle theoretically influence...
One main target in modern design of mobile working machines is the reduction of hydraulic oil in the on board actuator systems. This results in making the systems more environmentally friendly and leads to the idea of replacing the hydraulic actuators by electric actuators. Here this approach is presented by implementing electrical tubular linear actuators in a sickle bar, which is coupled with a...
A flat double-stator linear induction machine (DSLIM) with short cage mover is investigated in this study. The performance of the machine is evaluated with three different control methods: The first uses a constant slip frequency and current amplitude and it operates without any specific machine parameters. The others are vector control methods: Field oriented control (FOC) and direct thrust force...
Although numerous valuable research has been conducted by many authors, the relation between evolving mechanical faults and their fault-indicating reflections in the electrical signals of rotating electric machinery still requires extensive attention. This lack of information implies serious obstructions in the evolution of applying motor current signature analysis as a complete and reliable condition...
High vibration and acoustic noise are known to be the most dominant disadvantages for utilizing SRMs in Hybrid electric vehicles or home appliance applications. One of the methods for mitigating these disadvantages is to introduce windows in the SRM structure to reduce the magnitude of the radial force responsible for stator deformation. Previous studies are focused on introducing windows in the rotor...
In this work, a linear permanent magnet machine design is presented for applications that require high acceleration. This design uses aluminum as a supporting material for the moving secondary to reduce mass. Force production is maintained through the use of a quasi-Halbach array of permanent magnets. Aluminum, however, is conductive and the additional losses in the moving secondary lead to higher...
The paper describes simulations and measurements performed on the double-layer planar motor (DLPM), in order to analyze the static decoupling of the machine. By standstill levitation of the translator above the stator, the static coupling of force and torque components can be obtained. Possible sources of cross-coupling are predicted using an electromagnetic model and the obtained results are used...
The inherent advantages such as high robustness, low cost and high starting torque have made switched reluctance machine a strong candidate for electric vehicle applications. However, the serious vibration and acoustic noise are very troublesome. In this paper, a semi-analytical vibration prediction model is developed and an enhanced vibration reduction method is presented via random-varying turn-off...
This work describes a concept of a magnetically levitated homopolar bearingless slice motor in temple design. The proposed setup consists of two oppositely magnetized permanent magnets on the rotor and stator and provides high axial stiffness. The fluctuation of the air gap field for torque generation is generated with a cross-shaped rotor iron. Compared to a diametrically magnetized drive, this concept...
This work addresses an efficient and highly reliable Noise-Vibration-Harshness simulation and analysis framework for electrical induction drives in E-mobility applications. Based on a combined nonlinear analytic and Finite-Element modeling structure in spatial frequency space the entire operational Noise-Vibration-Harshness-simulation is embedded in one simulation environment and can be performed...
The radial and lévitation forces, necessary to suspend a double conical permanent magnet synchronous rotor, are generated by superposition of the rotor field and two stator fields with one pole pair difference. Due to the superposition of the fields in the air gap, some force interferences are disturbing the levitated drive. The origin of these perturbations are explained and described in a simplified...
This work presents a novel bearingless (slice) motor concept, the bearingless Vernier motor. It is intended for low speed and high torque applications, as typical for direct drives. Design criteria are deduced by the help of an analytic model describing single phase force and torque generation. The feasibility of the model is also proven by finite element simulations. Based on these results the performance...
In this paper, the mathematical model of Z-axis force/position-servo system of assembly manipulator of precise assembly platform for optical lens is established, including the mathematical models of permanent magnet synchronous motor (PMSM) and ball screw of manipulator, and then the friction and gravity disturbance is analyzed and modeled. Finally, the simulation is established to demonstrate the...
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