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This paper deals with the design of the rotor of synchronous reluctance machines, characterized by a multi flux-barrier structure. In particular, the focus will be on the proper design of flux-barriers geometry. An analytical model is adopted to compute the impact of the rotor flux-barriers on the torque, focusing on the torque ripple. Thanks to proper assumptions, the analytical model is simplified...
In this paper, a proposed analytical model is introduced for acceptable optimization of an axial flux permanent magnet (AFPM) machines. Nowadays the finite-element model is one of the most powerful tool to analysis the electrical machine. However, sometimes this method can be very time-consuming for further optimization. Therefore, in this paper, a hybrid analytical model based on sub-domain algorithm...
Electrical and mechanical faults in a three phase Induction machine is modelled and analysed, to identify potential fault signatures. Electrical, magnetic and torque signatures are analysed for various faults and their combinations, for potential fault signature identification. A multi-physics Finite Element tool is chosen for this analysis considering the possibilities to extend the study to thermal...
This paper investigates an induction machine using a novel concept of a converter-fed rotor. The stator is directly connected to the grid while the rotor is fed by a converter with a floating capacitor over the dc-link. In earlier work this topology has shown to be capable of improving the power factor and efficiency of a 4-pole induction machine. This paper explores the possibility to improve the...
This paper approaches the design using two optimization techniques for a permanent magnet generator used in a micro-wind turbine, with a major importance on the overall performances of the energy conversion system. The proposed micro-wind generator has two armatures and both are rotating in opposite directions.
Salient pole wound field synchronous machines (WFSMs) are widely used for various electric power generation, such as hydro and wind generators [1], because there is free of permanent magnet and it can be directly controlled by the DC winding.
We developed a parallel computation method for the electromagnetic field analysis of rotating machines with the 3-D finite element method with prismatic edge elements. We clarified the usefulness of the method through the dynamic characteristics analysis of an IPM motor.
An axial flux permanent-magnet (AFPM) motor requires 3-dimensional (3-D) modeling and analysis in order to describe completely its 3-D behavior. Although the 3-D finite element analysis (FEA) provides accurate solution, its computational cost limits its use as a design tool. To address this problem, a 3-D field reconstruction method (FRM) is introduced as an alternative to the 3-D FEA. In this paper,...
The contact interfaces for the rod-fastened rotor of a heavy-duty gas turbine rotor were analyzed and classified into three kinds. In order to predict the effects of contact interfaces on the rotor dynamic characteristics of the heavy-duty gas turbine generator set, the torsional characteristics of the contact segments were studied firstly. The piecewise bilinear torsional deformation model for the...
This paper presents an analytical model for an electrostatically actuated torsional micromirror having both a yoke layer, and a mirror layer. In particular, a relationship between the actuation voltage and the angle of rotation of the micromirror was derived from first principles. This model was then verified by means of finite element analysis and it was noted that there is a good agreement between...
This paper presents a high performance torque control of Permanent Magnet Synchronous Motors using a real time simulator with a Finite Element Analysis (FEA) based motor model. This model can simulate some behaviors of the actual motor includes nonlinear characteristics such as spatial harmonics and magnet saturations. Therefore, a model based control developed with FEA based motor model takes some...
This paper describes an interior permanent magnet synchronous motor (IPMSM) employing ferrite magnets instead of rare earth magnets that can be driven at high speeds. Neodymium and dysprosium are raw materials of rare earth magnets used in IPMSM, and the prices of these materials rose until recently. Although the prices are stable at present, the use of high performance rare earth magnets is increasing...
This paper deals with the unbalanced forces due to the rotor eccentricity. It describes two analytical models suitable for surface permanent magnet machine and synchronous reluctance machine, suitable to predict the flux density with a non-uniform air gap. The radial force on the rotor of the two machines is estimated in case of different rotor eccentricities, at no load and under load conditions...
A spur gear is the most common type of gears. They are mounted on parallel shafts, as shown in Fig. 1(a). Mechanical spur gears, which play important roles in transmission systems, inherently suffer from the drawbacks of high transmission loss, bulky size, high noise, wear-and-tear [1,2]. Magnetic spur gears can readily replace mechanical spur gears. Magnetic spur gears have no cut teeth or cogs and...
In order to fully analyze the characteristics of the excitation assistance switched reluctance wind power generator (EASRG), a static model and a dynamic model are built to perform the simulation of the EASRG. The static model is set up by using 3D finite element method (FEM), based on which the static magnetization and torque profiles could be obtained. The dynamic model employing two look-up tables...
The magnetic circuit of transverse flux reluctance machines causes magnetic flux in three spatial directions. 3-D FEM can be used designing the magnetic circuit, but it requires a relatively long computation time. Therefore 3-D FEM is not useful for an optimization tool. This paper compares four much faster design methods: A simple analytical approach, a magnetic equivalent network, a modified 2-D...
Limited-angle rotational compliant mechanism is required in micropositioning applications where a high-resolution rotational motion with a large range and compact size is needed. This paper presents the conceptual design, analytical modeling, and FEA performance evaluation of a novel compliant rotational micropositioning mechanism, which is designed based on a rotary flexure bearing. To enlarge the...
This paper deals with the modeling and control of a magnetically levitated planar motor. The actuator considered has moving coils and stationary magnets. The principal objective is to develop a model which can be implemented in simulation. Therefore, the data obtained by a finite element method (FEM) are used to derive mathematical expressions of the force and torque produced by this motor. Moreover,...
This paper is about an analytical computation method for a transverse flux permanent magnet excited machine. The analytical computation method makes use of a magnetic equivalent circuit with lumped elements considering saturation. The magnetic values of the magnetic equivalent circuit are solved via nodal analysis. Having the entire magnetic equivalent circuit of one pole pair of the transverse flux...
This paper deals with the analysis and design of a line-start synchronous machine. Such an investigation is carried out by means of an analytical model based on equivalent circuit parameters estimated by finite element (FE) analysis. Different approaches are considered for such a model, comparing their features. The main purpose is to obtain a rapid and precise procedure that allows to properly design...
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