scholarly journals A Method to Improve Torque Density in a Flux-Switching Permanent Magnet Machine

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5308
Author(s):  
Junshuai Cao ◽  
Xinhua Guo ◽  
Weinong Fu ◽  
Rongkun Wang ◽  
Yulong Liu ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
Electromotive Force ◽  
Fem Analysis ◽  
Torque Ripple ◽  
Electromagnetic Torque ◽  
Torque Density ◽  
Output Torque ◽  
Two Machines

With the continuous development of machines, various structures emerge endlessly. In this paper, a novel 6-stator-coils/17-rotor-teeth (6/17) E-shaped stator tooth flux switching permanent magnet (FSPM) machine is introduced, which has magnets added in the dummy slots of the stator teeth. This proposed machine is parametrically designed and then compared with the conventional 6/17 E-shaped stator tooth FSPM machine through finite element method (FEM) analysis. Then, combined with the results of FEM, the performance of two machines is evaluated, such as electromagnetic torque, efficiency, back electromotive force (back-EMF). The final results show that this novel 6/17 FSPM machine has greater output torque and smaller torque ripple.

Analysis of Electromagnetic Excitation Sources of Noise and Vibration in Interior Permanent Magnet Motor

2001 ◽  
Author(s):  
Hong-Seok Ko ◽  
Kwang-Joon Kim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
Torque Ripple ◽  
Permanent Magnet Motor ◽  
Electromagnetic Excitation ◽  
Noise And Vibration ◽  
Current Harmonics ◽  
Interior Permanent Magnet ◽  
Interior Permanent Magnet Motor

Abstract The purpose of this paper is to characterize electromagnetic excitation forces in an IPM (Interior Permanent Magnet) motor and to analyze their effects on noise and vibration. To do this, the electromagnetic excitation forces are classified into three parts and contribution of each to the noise and vibration is investigated. The first is cogging torque; in order to overcome drawbacks of finite element method in the initial design stage, an analytical method is proposed. The second is electrical torque ripple due to current harmonics; a simple equation for characterizing the current harmonics with respect to the electrical torque ripple is developed. The third is the excitation force related to distribution of electromagnetic forces in air-gap; existence of this force is understood by finite element method. The influence of the electromagnetic forces on the noise and vibration is investigated by doing modal analysis and operational deflection shape analysis.

scholarly journals Reducing Torque Ripples of the Axial Flux PM Motors by Magnet Stepping and Shifting

2018 ◽  
Vol 8 (1) ◽  
pp. 2385-2388
Author(s):  
E. Cetin ◽  
F. Daldaban
Keyword(s):  
Permanent Magnet ◽  
Electromotive Force ◽  
Torque Ripple ◽  
Electric Machines ◽  
Permanent Magnet Machines ◽  
Axial Flux ◽  
Element Analysis ◽  
Torque Density ◽  
Research Goal ◽  
Torque Ripples

Higher efficiency on electric machines is the research goal of many studies. An example is the axial flux permanent magnet machines. These machines have some advantages like their watt/kg efficiency and torque density. This study aims to develop the performance characteristics of the axial flux permanent magnet machines. A new rotor magnet poles design in axial flux machines is suggested to mitigate the torque ripples. The method of stepping and shifting of the magnets is used. Two different designs are compared to verify the proposed approach. 3D finite element analysis is used for simulations. Torque ripple and back electromotive force waveforms are obtained from computer analysis. As a conclusion, the suggested method is found to be useable and mitigates the torque ripples. In addition to that, back EMF waveforms are turned to sinusoidal by the suggested design.

scholarly journals Design and Analysis of Linear Fault-Tolerant Permanent-Magnet Vernier Machines

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Liang Xu ◽  
Jinghua Ji ◽  
Guohai Liu ◽  
Yi Du ◽  
Hu Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
Electromotive Force ◽  
Fault Tolerant ◽  
Time Stepping ◽  
Detent Force ◽  
Electromagnetic Characteristics ◽  
Long Stroke ◽  
High Thrust

This paper proposes a new linear fault-tolerant permanent-magnet (PM) vernier (LFTPMV) machine, which can offer high thrust by using the magnetic gear effect. Both PMs and windings of the proposed machine are on short mover, while the long stator is only manufactured from iron. Hence, the proposed machine is very suitable for long stroke system applications. The key of this machine is that the magnetizer splits the two movers with modular and complementary structures. Hence, the proposed machine offers improved symmetrical and sinusoidal back electromotive force waveform and reduced detent force. Furthermore, owing to the complementary structure, the proposed machine possesses favorable fault-tolerant capability, namely, independent phases. In particular, differing from the existing fault-tolerant machines, the proposed machine offers fault tolerance without sacrificing thrust density. This is because neither fault-tolerant teeth nor the flux-barriers are adopted. The electromagnetic characteristics of the proposed machine are analyzed using the time-stepping finite-element method, which verifies the effectiveness of the theoretical analysis.

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