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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...
In this paper, a five-phase hybrid-excitation flux-switching (HEFS) machine with “E”- core stator cell is proposed and analyzed. The topology and operation principle are investigated. Moreover, the armature winding connection method is analyzed and the analytical sizing equations are derived to determine the main design parameter of HEFS machine. The electromagnetic performance, including the conventional...
This paper presents the design optimization and performance analyses of a wound-field type brushless synchronous machine (WF-BSM) for traction drives in hybrid electric vehicles (HEVs). Research on a WF-BSM with free rare-earth magnet becomes an attractive research topic recently due to several advantages of robust rotor structure, high power capability that suitable for high-speed motor drive system...
The most common practice when designing high speed synchronous reluctance (SyR) machine consists in performing the electromagnetic design followed by a finite element rotor structural verification at the maximum operating speed. This approach could lead to sub-optimal designs because it neglects the effect of the rotor structural parts on the electromagnetic performance and vice versa. In order to...
This paper presents a high-speed 3 kW 80 krpm surface-mounted permanent magnet (SMPM) motor for compressor applications. The design procedure using finite element analysis (FEA) is presented with a particular focus on the efficiency calculation. The paper also aims to give general indications to provide a cost-efficient solution. A prototype is built and experimental results are given and compared...
An optimal design of internal Ferrite permanent magnet motor with embedded key FEM verification is presented with the scope to increase the efficiency of the small power motors without to use the expensive, rare earth permanent magnets. Two internal flux concentration topologies are analyzed and the geometric dimensions and performances are presented for three cases, all at 1kW rated power at 4500rpm...
This paper considers the electromagnetic and structural co-design of synchronous reluctance (SyR) machines for high-speed applications, with the aid of optimization algorithms. The aim of this work is twofold. First, three commercial electrical steel grades are compared to establish quantitatively how steel properties influence the performance of high-speed SyR machines. The considered steel grades...
The purpose of this paper is to characterize the performance of a novel dual-stator six slot four pole (6/4) flux switching permanent magnet machine. The proposed dual-stator 6/4 topology eliminates even order harmonics in the flux linkage and back electromotive force, which are present in the conventional single stator topology. The resulting back electromotive forces of the proposed dual-stator...
Axial flux magnetically geared machines offer the potential to achieve exceptional torque densities at high diameters. This work proposes a topology for an axial flux magnetically geared machine, in which the electric machine is placed in the bore of the axial flux magnetic gear. This new topology offers the advantage of correctly matching the size of the electric machine to its required torque without...
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