scholarly journals Spectrum Analysis and Optimization of the Axial Magnetic Gear with Halbach Permanent Magnet Arrays

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 2003
Author(s):  
Fang Hu ◽  
Yilan Zhou ◽  
Hesong Cui ◽  
Xiao Liu
Keyword(s):  
Permanent Magnet ◽  
Axial Force ◽  
Spectrum Analysis ◽  
Parametric Analysis ◽  
Air Gap ◽  
Torque Density ◽  
Output Torque ◽  
Magnetic Gear ◽  
The Difference ◽  
Force Calculation

In order to study the contribution of each harmonic to the output torque and axial torque of the axial magnetic gear with Halbach permanent magnet arrays (HAMG), torque and axial force calculation formulas of the HAMG are proposed based on the air-gap flux density distribution of the HAMG. Because of the difference of the air-gap flux densities at different radii, two simplified torque and axial force calculation formulas are proposed and compared. To improve the torque capability of the HAMG, parametric analysis of eight dimensional parameters is firstly conducted. By parametric analysis, six parameters such as the inner radius have been found to have obvious impact on the output torque and output torque density of the HAMG. The optimization using Maxwell software is then executed for maximizing the output torque density of the HAMG. The output torque density of the optimized HAMG is improved from 78.1 kNm/m3 to 93.3 kNm/m3 with an increase of 19%. Furthermore, spectrum analysis is also presented to illustrate the significant output torque improvement based on the torque calculation formulas.

Development of spoke-type IPM magnetic gear

2020 ◽  
Vol 64 (1-4) ◽  
pp. 771-778
Author(s):  
Yuma Mizuana ◽  
Kenji Nakamura ◽  
Yuma Suzuki ◽  
Yuhei Oishi ◽  
Yuichi Tachiya ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Permanent Magnets ◽  
Acoustic Noise ◽  
Eddy Current Loss ◽  
Current Loss ◽  
Torque Density ◽  
Output Torque ◽  
Interior Permanent Magnet ◽  
Magnetic Gear

Magnetic gears can change output-torque and -speed without any mechanical contacts. Therefore, they have a low acoustic noise and vibration, and their maintainability and reliability are high. Especially, a flux-modulated type magnetic gear is expected to be put into practical use because its torque density is higher than that of other magnetic gears. For the practical use, further improvement of torque and losses is important, especially, reduction of eddy current loss in permanent magnets (PMs) due to asynchronous harmonic magnetic fluxes is necessary. This paper investigates an interior permanent magnet (IPM) structure to improve the efficiency by reducing the eddy current loss in PMs. In addition, this paper presents a method for increasing torque of the IPM magnetic gear by changing a position of magnetic-bridge.

Optimized Design of Magnetic Gear with High Torque Density and Permanent Magnet Utilization

2021 ◽  
Author(s):  
Yusheng Hu ◽  
Liyi Li ◽  
Bin Chen ◽  
Yong Xiao ◽  
Meiyang Liu ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Optimized Design ◽  
Torque Density ◽  
High Torque ◽  
Magnetic Gear

Study on Improvement of Transmission Torque for a Surface Permanent Magnet Type Magnetic Gear

2012 ◽  
Vol 721 ◽  
pp. 237-242 ◽  
Author(s):  
Masaru Oka ◽  
Takashi Todaka ◽  
Masato Enokizono ◽  
Kousuke Nagaya ◽  
Tomoyuki Fujita
Keyword(s):  
Permanent Magnet ◽  
Flux Density ◽  
Flux Distribution ◽  
Permanent Magnets ◽  
Torque Density ◽  
Magnetic Forces ◽  
Dimensional Finite Element ◽  
Flux Concentration ◽  
Magnetic Gear ◽  
Flux Density Distribution

Magnetic gears are a force transmitter consisting of permanent magnets. The mechanical input can be transmitted to an output shaft without contact by magnetic forces. The magnetic gears are not worn out because there is no friction. As a result, the running costs such as the maintenance fee can be suppressed and the resources can be saved. However, the transmission torques of the conventional magnetic gears, which have so far been developed, are very low. Besides, new structure models designed for high torque density need a lot of permanent magnets and multi-pole constructions. Those structures are complex and the manufacturing is difficult. In this research, we applied a flux concentration type surface permanent magnet arrangement to a surface permanent magnet type magnetic gear in order to improve the transmission torque and to reduce the amount of permanent magnets. The magnetic flux distribution, the gap flux density and the transmission torque of the developed new models are numerically analyzed by using the two-dimensional finite element method. In this paper, a permanent magnet structure optimized to reduce its amount and influence of the flux concentration type surface permanent magnet arrangement on the gap flux density distribution and transmission torque are reported.

scholarly journals Optimization Analysis of Automotive Asymmetric Magnetic Pole Permanent Magnet Motor by Taguchi Method

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Wenchao Zhang ◽  
Liwei Shi ◽  
Kaiwen Liu ◽  
Lintao Li ◽  
Jianning Jing
Keyword(s):  
Taguchi Method ◽  
Permanent Magnet ◽  
Flux Density ◽  
Magnetic Circuit ◽  
Harmonic Distortion ◽  
Air Gap ◽  
Total Harmonic Distortion ◽  
Initial Structure ◽  
Cogging Torque ◽  
Output Torque

In order to improve the air-gap flux density of the permanent magnet synchronous motor and reduce the cogging torque, a novel structure with asymmetric magnetic poles for automobile was proposed. Based on the characteristics of the parallel magnetic circuit, the magnetic flux path diagram is established. And the equivalent magnetic circuit model is established by the equivalent magnetic circuit method. The Taguchi method is used to be a multiobjective optimization algorithm. The total harmonic distortion of the air-gap flux density is the first optimization goal. The second and third optimization goals are the cogging torque and the average of output torque, respectively. And the torque ripple is a constraint condition. The optimized parameter combination is obtained by the Taguchi method. Finite element simulation analysis and prototype test are carried out for the optimized motor structure. The results show that the total harmonic distortion of air-gap flux density is reduced by 36.7% comparing with the initial structure. The cogging torque is reduced by 26.0%. And the average output torque is increased by 4.8%.

scholarly journals Magnetic gear with intersecting axes and straight stationary pole-pieces

2018 ◽  
Vol 10 (11) ◽  
pp. 168781401880886
Author(s):  
Xiuhong Hao ◽  
Hongqian Zhu ◽  
Xuemei Guan ◽  
Deng Pan
Keyword(s):  
Permanent Magnets ◽  
Design Parameters ◽  
Orthogonal Experimental Design ◽  
The Finite Element Method ◽  
Torque Density ◽  
Output Torque ◽  
Processing Cost ◽  
Magnetic Gear ◽  
Field Modulation ◽  
Static Torque

Based on the magnetic field modulation effect, this article presents a magnetic gear with intersecting axes and straight stationary pole-pieces. Except for a higher utilization of permanent magnets and a greater output torque, the magnetic gear with intersecting axes and straight stationary pole-pieces provides several advantages, such as a smaller volume, higher torque density, and lower processing cost. The magnetic gear with intersecting axes and straight stationary pole-piece topology is herein introduced and the deduced constraints of the structural design are outlined. The transmission mechanism is demonstrated by analyzing the output torque in the middle of the air gaps. The effects of the main design parameters on the maximum static torque are evaluated using the finite element method. Based on the orthogonal experimental design and the response surface method, the optimum design results are provided. Prototype of the magnetic gear with intersecting axes and straight stationary pole-pieces has been realized and the static torque has been verified experimentally.

Influence of unequal stator tooth width on the performance of outer-rotor permanent magnet machines

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 432-438
Author(s):  
Aimeng Wang ◽  
Dashuang Li
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Machines ◽  
Efficiency Improvement ◽  
Machine Model ◽  
Element Analysis ◽  
Torque Density ◽  
Output Torque ◽  
Tooth Width ◽  
Outer Rotor ◽  
High Torque

AbstractOuter-rotor permanent magnet machines for low-speed and high-torque applications have been used due to their high moment of inertia and torque density. In this paper, the 12-slot/10-pole outer-rotor fractional-slot permanent magnet machine model is established by finite element analysis, the influence of unequal stator tooth width and tooth tip width is investigated for the PM machine, and five different schemes of stator tooth and tip width are designed and analyzed. Detailed comparisons of the performance characteristics of the machines are presented including important issues such as output torque, magnetic field distribution, and tooth flux density. It is shown that the torque density and cogging torque and efficiency can be effectively improved by choosing reasonable tooth and tip width, which lays a foundation for further optimum design and efficiency improvement of the machine.

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.

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