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Gamma Ray Bursts (GRBs) are the strongest explosions in the universe which might be associated with creation of black holes. Magnetic field structure and burst dynamics may influence polarization of the emitted gamma-rays. Precise polarization detection can be an ultimate tool to unveil the true GRB mechanism. POLAR is a space-borne Compton scattering detector for precise measurements of the GRB polarization...
This paper investigates the transient synchronization performance of a line-start permanent magnet synchronous machine (LS PMSM) taking into account the effect of the rotor cage slot design, active permanent magnet volume and load inertia. First the transient performances of a rotor cage with different slot profiles and the same cross sectional area are evaluated. The design optimization of LS PMSM...
This paper presents the implementation of the Taguchi method for a retrofit design of a line-start permanent magnet motor. To evaluate the viability of the method, the optimum designs obtained from both the Taguchi and a traditional optimization methods are compared. This outlines the respective advantages and disadvantages of both methods. It shows that the Taguchi method is an efficient and robust...
Magnetic gears and integrated magnetically geared machines have recently received much attention due to their exceptionally high torque densities. As in the design and analysis of conventional electrical machines, the finite element method (FEM) has been widely used for this class of electrical machine. For the sake of computational efficiency, the standard practice in FEM modeling is to reduce the...
This paper reviews the historic and current development of magnetic gear technologies. There has been considerable amount of research and development activities on magnetic gear technologies in recent years. However, it is still not clear if this technology is ready for potential industry applications. The purpose of this paper is to summarize the historic and current development work of magnetic...
This paper presents the design, construction and performance evaluation of a disc-type magnetically geared permanent magnet (MGPM) machine for wind power application. The electromagnetic design for both magnetically coupled and decoupled configurations are described. Considering the complex structure of a MGPM machine, special attention is also paid to the mechanical design aspects. The optimized...
This paper presents the design of a magnetically geared PM machine with an inner stator. Both magnetically coupled and decoupled configurations are evaluated. Key design aspects are discussed. The machine is optimized for maximum torque per active mass using two-dimensional finite element (FE) analysis. Special attention is also paid to cogging torque minimization. The performance characteristics...
This paper presents a comparison of the torque capability of two PM machines with integrated magnetic gears for low speed, high torque applications. The machines are also compared against a more conventional fractional-slot PM machine to evaluate the benefits of the geared machines. The comparison is based on the optimal torque per active mass that could be achieved within a given volume. The machines...
This paper presents the thermal analysis of a water-cooled interior permanent magnet (IPM) machine. An efficient quasi-3D lumped parameter thermal model is described and then applied to a practical IPM machine. The analytical model is validated by comparing its results with those obtained using detailed two-dimensional and three-dimensional finite element thermal analysis. Relevant conclusions are...
In this paper, the design of a prototype concentric-type magnetic gear is evaluated. The effects that the mechanical bridges connecting the modulator segments have on the performance of the gear have been analyzed by using detailed two-dimensional (2D) finite element (FE) analysis. The magnetic gear suffers significantly from end-effects, which result in a considerable decrease in the peak torque...
The layouts, formulation and winding factors of iron-and air-cored non-overlap winding permanent magnet machines are considered in this paper. The winding formulation gives information about the use of negative periodical boundary conditions in the finite element analysis. Particular attention is given to air-cored non-overlap windings, with entirely different results regarding optimal slot-pole combinations.
In this paper two different concentrated coil configurations for radial flux air-cored permanent magnet (RFAPM) machines are analysed and evaluated against a RFAPM machine that utilises overlapping coils. The comparative analysis of the different machines are done analytically. The analytical results are compared with finite element analysis results of simplified linearised equivalent models for the...
In this paper the performance of air-cored stator axial flux permanent magnet machines with different type of concentrated (non-overlapping) coil windings is evaluated. The evaluation is based on theoretical analysis and is confirmed by finite element analysis and measurements. It is shown that concentrated-coil winding machines can have similar performance as normal overlapping winding machines using...
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