Design and analysis of PMLSM with SIN + 3rd shaping mover

2018 ◽  
Vol 37 (6) ◽  
pp. 2158-2175 ◽  
Author(s):  
Lufeng Zhang ◽  
Kai Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
Design Methodology ◽  
Thrust Force ◽  
Synchronous Machines ◽  
Content Type ◽  
Third Harmonic ◽  
Pitch Ratio ◽  
Sinusoidal Currents

Purpose The purpose of this paper is to investigate the electromagnetic performances of the permanent magnet linear synchronous machines (PMLSM) with sine and third harmonic (SIN + 3rd) shaping mover in comparison with the PMLSM with sine (SIN) shaping mover and conventional shaping mover. Design/methodology/approach The optimal amplitude of the injected third harmonic to re-shape the SIN + 3rd shaping permanent magnet (PM) for maximizing the thrust force is analytically derived and confirmed by finite element method (FEM). Furthermore, the PM edge thickness, the pole arc to pole pitch ratio and the tooth to slot ratio are optimized. It is found that the optimal amplitude of the injected third harmonic is one-sixth of the fundamental one, the optimal PM edge thickness, the pole arc to pole pitch ratio and the tooth to slot ratio are 0, 0.85 and 0.5 mm, respectively. In addition, the electromagnetic performances are analyzed and quantitatively compared for the PMLSM with SIN + 3rd shaping mover, SIN shaping mover and conventional shaping mover. Findings The average thrust force and efficiency of the PMLSM with SIN + 3rd shaping mover are improved significantly, while the thrust ripple is not increased, comparing to those of the PMLSM with SIN shaping mover. Meanwhile, the thrust ripple is lower than that of the conventional shaping mover. Research limitations/implications The purely sinusoidal currents are applied in this analysis and the influences of harmonics in the current on electromagnetic performances are not considered. Originality/value This paper presents a PMLSM with SIN + 3rd shaping mover to improve the thrust force and efficiency without increasing the thrust ripple, considering the effects of the amplitude of the injected third harmonic to re-shape the SIN + 3rd shaping PM, the PM edge thickness, the pole arc to pole pitch ratio and the tooth to slot ratio.

Numerical modeling of structural capacity of corroded bolted assembly

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Rachid Radouani ◽  
Mohamed Essahli ◽  
Younes Ech-Charqy
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Modeling ◽  
Stress Corrosion Cracking ◽  
Design Methodology ◽  
Bolted Joint ◽  
The Finite Element Method ◽  
Content Type ◽  
Structural Capacity ◽  
Resistant Moment

PurposeValidate the resistance of bolted connections in terms of stresses, resistant moment and contact pressure.Design/methodology/approachFinite element modeling of corroded bolted joint.FindingsThe three types of corroded assemblies are resistant to the applied loads.Originality/valueThe research is original, it studies the stress corrosion cracking of a bolted assembly's end plate by the finite element method.

Effects of piston design parameters on skirt-liner dynamic behavior

2016 ◽  
Vol 68 (2) ◽  
pp. 250-258 ◽  
Author(s):  
Ridha Mazouzi ◽  
Ahmed Kellaci ◽  
Abdelkader Karas
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Power Loss ◽  
Design Methodology ◽  
Great Influence ◽  
Structural Deformation ◽  
Design Parameters ◽  
Content Type ◽  
Piston Cylinder ◽  
Oil Film Pressure

Purpose – This paper aims to study the effect of piston skirt design parameters on the dynamic characteristics of a piston–cylinder contact. Design/methodology/pproach – This paper focuses on an analysis of the piston dynamic response. The oil-film pressure and the structural deformation were approximated, respectively, by finite difference method and finite element method. Findings – The results show that the design parameters such as clearance, offset and the axial location of piston pin have a great influence on the dynamics of the piston and hence on the piston slap phenomenon and the frictional power loss. Originality/value – All the results mainly focus on the slap noise of the engine and can be used in the piston–liner development at the development of the engine.

Thermal modeling and analysis of double-sided water-cooled permanent magnet linear synchronous machines

2016 ◽  
Vol 35 (2) ◽  
pp. 695-712 ◽  
Author(s):  
Yi Chen ◽  
Yihua Yao ◽  
Qinfen Lu ◽  
Xiaoyan Huang ◽  
Yunyue Ye
Keyword(s):  
Permanent Magnet ◽  
Water Flow ◽  
Flow Rate ◽  
Thermal Performance ◽  
Temperature Rise ◽  
Thrust Force ◽  
Water Flow Rate ◽  
Synchronous Machines ◽  
Coupled Analysis ◽  
Content Type

Purpose – With the popularization of permanent magnet linear synchronous machines (PMLSMs) in recent years, the temperature rise has attracted increasingly attention since excessive heat generated in the windings could deteriorate the electromagnetic performance. In order to solve this problem, adopting water-cooled system is an effective method. The purpose of this paper is to investigate a 12-slot/11-pole (12S/11P) water-cooled double-sided PMLSM, which adopts the all teeth wound concentrated winding and shifted armature ends. Design/methodology/approach – Based on 2D finite element analysis (FEA), the thermal performances, such as temperature distribution, the optimization of water flow rate and the influence of demagnetization, are investigated under the condition of continuous duty. Then the maximum current density and average thrust force are calculated for PMLSMs with or without water-cooled system. Finally, the detailed comparison is made between single-sided PMLSM and double-sided PMLSM. Findings – With water-cooled system, the thermal performance of PMLSM can be improved, such as an efficient decrease of temperature rise, restriction of permanent magnet demagnetization and a dramatic increase of the maximum thrust force. It is found that the water flow rate has a significant impact on temperature rise, which can be optimized according to demands. Originality/value – Electromagnetic and thermal coupled analysis is proposed in this paper. It can approximately predict thermal performance and save the manual iteration time at the same time. This method also can provide as a reference of thermal analysis for other PMLSMs.

Numerical simulation of Plateau’s problem of minimal surfaces using nonvariational finite element method

2016 ◽  
Vol 33 (5) ◽  
pp. 1490-1507 ◽  
Author(s):  
Garima Mishra ◽  
Manoj Kumar
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Minimal Surfaces ◽  
Design Methodology ◽  
Engineering Application ◽  
Content Type ◽  
Plateau’S Problem ◽  
Plateau's Problem ◽  
Element Method

Purpose – Numerical solution of Plateau’s problem of minimal surface using non-variational finite element method. The paper aims to discuss this issue. Design/methodology/approach – An efficient algorithm is proposed for the computation of minimal surfaces and numerical results are presented. Findings – The solutions obtained here are examined for different cases of non-linearity and are found sufficiently accurate. Originality/value – The manuscript provide the non-variational solution for Plateau’s problem. Thus it has a good value in engineering application.

Simulation on polytropic process of air springs

2016 ◽  
Vol 33 (7) ◽  
pp. 1957-1968 ◽  
Author(s):  
Xuebing Li ◽  
Yintao Wei ◽  
Yuan He
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Design Methodology ◽  
Air Spring ◽  
Content Type ◽  
Polytropic Process ◽  
Pneumatic Structures ◽  
Element Method

Purpose The purpose of this paper is to propose a method to simulate the polytropic process of air springs. Design/methodology/approach An iterative finite element method (FEM) is proposed. Findings The proposed method is reliable and effective in solving the polytropic process of air springs. Originality/value This work would be helpful for understanding the simulation of pneumatic structures, and the proposed modified FEM would be useful for improving the simulation of the mechanical behavior of an air spring.

Analytical calculation of leakage permeance of coreless axial flux permanent magnet generator

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jun Zhu ◽  
Shuaihui Li ◽  
Xiangwei Guo ◽  
Huaichun Nan ◽  
Ming Yang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
Magnetic Circuit ◽  
Axial Magnetic Field ◽  
Three Dimensional ◽  
Analytical Calculation ◽  
Content Type ◽  
Leakage Flux ◽  
Element Method

Purpose This paper aims to study the relationship between leakage flux coefficient and the coreless axial magnetic field permanent magnet synchronous generator (AFPMSG) size and obtain the expressions of leakage flux coefficient. Design/methodology/approach In this paper, a magnetic circuit model of coreless AFPMSG is proposed. Four kinds of leakage permeances of permanent magnet (PM) are considered, and the expression of no-load leakage flux coefficient is obtained. Solving the integral region of leakage permeances by generator size, which improves the accuracy of the solution. Findings Finite element method and magnetic circuit method are used to obtain the no-load leakage flux coefficient and its variation trend charts with the change of pole arc coefficient, air gap length and PM thickness. The average errors of the two methods are 2.835%, 0.84% and 1.347%, respectively. At the same time, the results of single-phase electromotive force obtained by magnetic circuit method, three dimensional finite element method and prototype experiments are 19.36 V, 18.82 V and 19.09 V, respectively. The results show that the magnetic circuit method is correct in calculating the no-load leakage flux coefficient. Originality/value The special structure of the coreless AFPMSG is considered in the presented equivalent magnetic circuit and equations, and the equations in this paper can be applied for leakage flux evaluating purposes and initial parameter selection of the coreless AFPMSG.

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