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A novel doubly salient permanent magnet motor named flux switch permanent magnet motor (FSPM) was designed and analyzed. The stator and rotor of FSPM are all salient structures. There are a marked verge domino effect and serious saturation phenomenon. Due to high nonlinearities of FSPM, finite element method (FEM) was used to analyze magnetic field distribution, permanent magnet flux linkage, electromotive...
In this paper, an axial-radial flux compound-structure permanent-magnet synchronous machine (CSPMSM) which consists of one axial-flux PMSM and one radial-flux PMSM is investigated. The purpose of this kind of machine is to keep the internal combustion engine (ICE) operating at maximum efficiency by harmonizing its two machines during all driving cycles in hybrid electric vehicle (HEV), and therewith...
The flux-switching permanent magnet (FSPM) machine exhibits competitive torque capability and power density due to the high flux density. As a penalty, the cogging torque is relative large, resulting in unfavorable torque pulsation. Due to the simple and robust rotor construction, additional dummy slots are adopted to reduce the cogging torque without skewing magnets or teeth. The optimal dimensions...
Firstly, the topology and operation principle of the permanent-magnet BLDC motor for automatic door are researched in the paper. A method for decreasing cogging torque by cooperating of pole number and slot number is given. To increase the inner space utilization rate and the motor efficiency, the double-layer-and-short-pitch windings are employed. Secondly, taking terminal voltage as input, transient...
A comparing study is done for interior permanent magnet synchronous motors (IPMSM) with different pole and slot combinations. The effect on winding factor, electromagnetic torque components, salient ratio, cogging torque and torque ripple for different pole and slot combinations are calculated. The characteristics of torque performance, losses and demagnetizing ability for different slots per pole...
This paper presents the result of the two-dimensional finite element analysis on the effects of rotor pole arc variation and number of teeth per rotor pole with different teeth depths and stator excitation pattern on various performance parameters like cogging torque, developed torque, harmonic torques, torque ripple and phase inductance for an 6/8, three phase flux reversal motor. A novel excitation...
This paper deals with a design to improve operating characteristic of spoke type BLDC motor. By reason of variation magnetic field, cogging torque is generated. Cogging torque of Spoke type motor is bigger than other type permanent magnet motor. So, this paper presents a design notch on stator and variation rotor shape to reduce cogging torque of Spoke Type motor. Through Fourier formulation of magnetic...
In this paper, the static and dynamic electromagnetic performance, including the airgap field distribution, the back-emf waveform, the cogging torque, and the torque-speed characteristic and the efficiency, of three alternative Halbach permanent magnet brushless motors, employing anisotropic bonded NdFeB Halbach cylinder with and without rotor back-iron, as well as segmented Halbach cylinder with...
Permanent magnet synchronous generators (PMSGs) have a bright prospect in the small wind turbine applications. Finite element method (FEM) is a powerful tool to study and design PMSGs, as reported in this paper. First, FEM is employed to study the PMSG's output voltage. Valuable conclusions have been drawn regarding of the PMSG's performance and manufacture cost. Second, a FEM model, which can be...
In this paper, an analytical modeling of an axial flux permanent magnet synchronous generator (AFPMSG) is investigated. The proposed model is based on an exact two dimensional (2D) solution of the magnetic field in the generator. Then, the generator's quantities such as the phase electromotive force (EMF), the cogging torque and electromagnetic torque are written based on the developed exact 2D solution...
The concentrated windings designs are often used in small BLDC motors as well as in AC servomotors due to their shorter end windings and smaller packing size. They are not yet frequently used in larger electrical machines due to concerns about torque density. For example, for a design with slot/ pole ratio of 1.5, the winding factor decreases to 0.866 which the penalty of smaller packaging size is...
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