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This paper comprehensively investigates the voltage distortion (i.e. terminal voltage ripple) mechanisms in surface-mounted permanent magnet (SPM) machines equipped with a single layer fractional slot concentrated winding (FSCW). Stator flux gaps can be used in FSCW machines to increase the pitch factor and hence the winding factor, as well as to simplify the manufacturing process. Furthermore, they...
In order to minimize the cogging torque and torque ripple for surface mounted permanent magnet (SPM) machines, this paper proposes a C-core modular stator which can be obtained by inserting flux gaps (FGs) into every stator tooth. The electromagnetic performances of C-core modular PM machines such as open-circuit flux linkage, phase back-EMF, cogging torque and torque ripple, etc. are comprehensively...
Based on the conventional hybrid excitation switched flux permanent magnet (HE-SFPM) machines, this paper proposes a novel HE-SFPM machine with hybrid magnets, e.g. Ferrite + NdFeB. By changing the magnet composition, e.g. changing the Ferrite and NdFeB quantities, different machine performance can be achieved. The frozen permeability method is used to identify the individual contribution of magnets...
The electromagnetic performance of alternative single layer modular switched flux permanent magnet (SFPM) machines, i.e. conventional, C-core, E-core and modular, is compared by finite element analysis in this paper. The comparison includes winding factor, open-circuit flux density, back-EMF and electromagnetic torque, together with the influence of four slot/pole number combinations (12s/10p, 12s/11p,...
This paper comprehensively investigates 3-phase, 12-slot, and 8-pole switched reluctance machines (SRMs) with different winding configurations, e.g. double/single layer, short/fully pitched. Comparisons in terms of self- and mutual inductances, and on-load torques have been carried out using 2-D finite element method (FEM) for conventional and mutually coupled, double layer winding switched reluctance...
In recent years, the applications of dc transmission method become more and more popular with the fast development of power electronics technology. The dc systems may face various kinds of faults during actual operation and the corresponding control strategies against these situations are of great significance to make the system keep stable operation. In this paper, a simple dc system topology structure...
This paper presents the electromagnetic loss and thermal modelling of a switched flux permanent magnet (SFPM) machine. A 2D finite element method is first used to calculate the stator and rotor iron losses as well as PM eddy current losses. Then, 3-D thermal modelling has been performed for analysing the temperature distribution within the SFPM machine, the calculated power losses have been applied...
This paper presents the electromagnetic loss analysis and mitigating methods of switched flux permanent magnet (SFPM) machines. The 2-dimentional finite element (2-D FE) method is used to calculate the flux density in all the mesh elements within stator and rotor iron cores, then the stator and rotor hysterisis, eddy current and excess losses are calculated. The PM eddy current losses have been calculated...
This paper presents a comparative study of magnetic force, vibration and acoustic noise of classical and mutually coupled switched reluctance motors (SRM) with 6-slot and 4-pole. Construction of 2D multi-physic models allows us to predict these two kinds of motor vibration and noise behavior which are mainly caused by radial magnetic force. With the same structure and same average output torque, the...
A magnetically shielded setup was developed for characterizing magnetoresistance (MR) and noise properties of magnetic tunneling junction (MTJ) sensors. A mu-metal shielding is installed to avoid the interference of external magnetic disturbance. Both MR curves and noise power spectra of MTJ sensors can be obtained for further data analysis. Moreover, a hard-axis magnetic field can be applied to eliminate...
This paper examines the fault diagnosis (including detection and localization) of a Flux Switching permanent magnet Motor (FSM). Electrical and mechanical models of fault due to a partial short-circuit on one phase is described and used on a numerical simulation in order to detect and localize the fault. Fault detection is realized by a diagnostic observer (Kalman filter) which generates residual...
This paper presents a novel structure of double salient interior permanent magnet machine (DSIPM machine) based on mutually coupled switched reluctance machine (MCSRM). Due to its salient rotor structure, the DSIPM machine can have less magnetic and iron materials as well as higher dynamic response than conventional IPM machines. The comparison of electromagnetic performances in terms of self and...
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