Simplified analysis of iron loss in three-phase transformer considering rotating loss

2013 ◽  
Vol 33 (1/2) ◽  
pp. 74-84
Author(s):  
Yang Liu ◽  
Yanli Zhang ◽  
Dexin Xie ◽  
Baodong Bai
Keyword(s):  
Design Methodology ◽  
Silicon Steel ◽  
Iron Loss ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
Content Type ◽  
Three Phase ◽  
The Finite Element Analysis ◽  
Simplified Method ◽  
Property Measurement

Purpose – A simplified method for calculating iron loss of three-phase transformer is proposed in this paper. The rotating iron loss measured from 2-D vector magnetic property measurement system of gain-oriented silicon steel sheet can be taken into account in this method. The paper aims to discuss these issues. Design/methodology/approach – The finite element analysis formulation is combined with the magnetic reluctivity model expressed by diagonal tensor for 2-D nonlinear and anisotropic magnetic problem, while the iron loss is computed in terms of the interpolation of rotational loss curves measured under various loci of controlled magnetic flux density B. Findings – The iron loss of three-phase transformer is obtained by the proposed method. And the calculating iron loss is verified with experimental results. Originality/value – The method presented in this paper enables the iron loss of three-phase transformer to be more accurately calculated and more easily applied, considering the rotational iron loss.

Analysis of 24Slot wound field salient rotor switched-flux machine based on 2D-FEA

2016 ◽  
Vol 13 (5) ◽  
pp. 381-385 ◽  
Author(s):  
Faisal Khan ◽  
Erwan Sulaiman ◽  
Hassan Ali Soomro ◽  
Fairoz Omar ◽  
Zarafi Ahmad
Keyword(s):  
High Speed ◽  
Design Methodology ◽  
Optimization Method ◽  
Optimized Design ◽  
Flux Linkage ◽  
Element Analysis ◽  
Content Type ◽  
Three Phase ◽  
Rotor Poles ◽  
Dimensional Finite Element

Purpose The paper aims to propose and compare two new structures of a three-phase wound field salient rotor (WFSR) switched-flux motor (SFM) with 24 stator slots and 10 or 14 rotor poles, respectively, for high-speed operation. Design/methodology/approach The paper outlines the motor general construction and design concept of proposed machines. Flux linkage, average torque, rotor mechanical strength and torque–speed characteristics of both machines were analyzed and compared by two-dimensional finite element analysis (2D-FEA). Deterministic optimization method was adopted to enhance the characteristics of 24Slot-10Pole WFSR SFM. Findings The paper provides simulation results and discusses how 24Slot-10Pole WFSR SFM structure is superior to the 24Slot-14Pole in the aspects of flux linkage, average torque and power. It further concludes that the optimized design of 24Slot-10P has achieved 58 and 72 per cent higher average torque and power compared to initial design, as well as high average torque and power compared to 24Slot-14P design. Originality value Optimized structure of the 24Slot-10Pole WFSR SFM with non-overlapping windings has been proposed.

Optimization design of titanium alloy connecting rod based on structural topology optimization

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bin Zheng ◽  
Yi Cai ◽  
Kelun Tang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Topology Optimization ◽  
Optimization Design ◽  
Equivalent Stress ◽  
Connecting Rod ◽  
Element Analysis ◽  
Content Type ◽  
The Finite Element Analysis ◽  
Maximum Equivalent Stress

Purpose The purpose of this paper is to realize the lightweight of connecting rod and meet the requirements of low energy consumption and vibration. Based on the structural design of the original connecting rod, the finite element analysis was conducted to reduce the weight and increase the natural frequencies, so as to reduce materials consumption and improve the energy efficiency of internal combustion engine. Design/methodology/approach The finite element analysis, structural optimization design and topology optimization of the connecting rod are applied. Efficient hybrid method is deployed: static and modal analysis; and structure re-design of the connecting rod based on topology optimization. Findings After the optimization of the connecting rod, the weight is reduced from 1.7907 to 1.4875 kg, with a reduction of 16.93%. The maximum equivalent stress of the optimized connecting rod is 183.97 MPa and that of the original structure is 217.18 MPa, with the reduction of 15.62%. The first, second and third natural frequencies of the optimized connecting rod are increased by 8.89%, 8.85% and 11.09%, respectively. Through the finite element analysis and based on the lightweight, the maximum equivalent stress is reduced and the low-order natural frequency is increased. Originality/value This paper presents an optimization method on the connecting rod structure. Based on the statics and modal analysis of the connecting rod and combined with the topology optimization, the size of the connecting rod is improved, and the static and dynamic characteristics of the optimized connecting rod are improved.

A Design Methodology for System Parameters Synthesis of Elastic Planar Linkages: Theory

1992 ◽  
Vol 114 (4) ◽  
pp. 536-541 ◽  
Author(s):  
Zine-Eddine Boutaghou ◽  
A. G. Erdman
Keyword(s):  
Design Methodology ◽  
Design Sensitivity ◽  
Element Analysis ◽  
System Parameters ◽  
Sensitivity Equations ◽  
The Finite Element Analysis ◽  
Planar Linkages ◽  
Multi Body ◽  
Four Bar Linkage ◽  
Theoretical Considerations

Existing formulations predict the displacement and stresses in multi-body systems that result from known system parameters. In contrast, the proposed design methodology enables structured selection of system parameters necessary to produce desired elastic displacements, stresses, and frequencies. This design process involves the development of inverse design equations, the finite element analysis, and the design sensitivity equations to obtain converged solutions satisfying desired design constraints. Part 1 (Theory) considers the theoretical considerations involved. Part 2 (Applications) applies the methodology to design a four-bar linkage and a six-bar linkage.

scholarly journals Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3887
Author(s):  
Jeong ◽  
Lee ◽  
Hur
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Component ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
Cogging Torque ◽  
Maxwell Stress Tensor ◽  
The Finite Element Analysis ◽  
Harmonic Components

This paper presents a mitigation method of slot harmonic cogging torque considering unevenly magnetized magnets in a permanent magnet synchronous motor. In previous studies, it has been confirmed that non-uniformly magnetized permanent magnets cause an unexpected increase of cogging torque because of additional slot harmonic components. However, these studies did not offer a countermeasure against it. First, in this study, the relationship between the residual magnetic flux density of the permanent magnet and the cogging torque is derived from the basic form of the Maxwell stress tensor equation. Second, the principle of the slot harmonic cogging torque generation is explained qualitatively, and the mitigation method of the slot harmonic component is proposed. Finally, the proposed method is verified with the finite element analysis and experimental results.

The Finite Element Analysis of a Shipyard's Lifting Eye with Load

2013 ◽  
Vol 631-632 ◽  
pp. 1006-1010
Author(s):  
Shao Fen Lin ◽  
Zhao Yi Zhu
Keyword(s):  
Finite Element ◽  
Working Conditions ◽  
High Reliability ◽  
Strength Analysis ◽  
Bearing Surface ◽  
Calculation Methods ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Simplified Method ◽  
Nonlinear Contact

As lifting points for ship block turning over and hoisting operation, the strength of the lifting eye directly affects the safety of the operation, therefore it is required for extreme high reliability. The conventional strength analysis can not exactly describe the actual stress and working conditions of the lifting eye, nonlinear contact and simplified finite element arithmetic are used for analyzing and checking the lifting eye's strength in this paper; and the stress force distribution formula, which can well reflect the true status of the pressure-bearing surface, is researched. Through the comparison of the various calculation methods, it can be found that the reasonable simplified method can approach the nonlinear contact finite element arithmetic with high precision and is characterized with higher calculation speed and more concise and practicable.

Simulation of iron losses in induction machines using an iron loss model for rotating magnetization loci in no electrical steel

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Martin Marco Nell ◽  
Benedikt Schauerte ◽  
Tim Brimmers ◽  
Kay Hameyer
Keyword(s):  
Finite Element ◽  
Flux Density ◽  
Core Loss ◽  
Induction Machine ◽  
Iron Loss ◽  
Magnetic Flux Density ◽  
Loss Model ◽  
Content Type ◽  
Iron Losses ◽  
Loss Models

Purpose Various iron loss models can be used for the simulation of electrical machines. In particular, the effect of rotating magnetic flux density at certain geometric locations in a machine is often neglected by conventional iron loss models. The purpose of this paper is to compare the adapted IEM loss model for rotational magnetization that is developed within the context of this work with other existing models in the framework of a finite element simulation of an exemplary induction machine. Design/methodology/approach In this paper, an adapted IEM loss model for rotational magnetization, developed within the context of the paper, is implemented in a finite element method simulation and used to calculate the iron losses of an exemplary induction machine. The resulting iron losses are compared with the iron losses simulated using three other already existing iron loss models that do not consider the effects of rotational flux densities. The used iron loss models are the modified Bertotti model, the IEM-5 parameter model and a dynamic core loss model. For the analysis, different operating points and different locations within the machine are examined, leading to the analysis of different shapes and amplitudes of the flux density curves. Findings The modified Bertotti model, the IEM-5 parameter model and the dynamic core loss model underestimate the hysteresis and excess losses in locations of rotational magnetizations and low-flux densities, while they overestimate the losses for rotational magnetization and high-flux densities. The error is reduced by the adapted IEM loss model for rotational magnetization. Furthermore, it is shown that the dynamic core loss model results in significant higher hysteresis losses for magnetizations with a high amount of harmonics. Originality/value The simulation results show that the adapted IEM loss model for rotational magnetization provides very similar results to existing iron loss models in the case of unidirectional magnetization. Furthermore, it is able to reproduce the effects of rotational flux densities on iron losses within a machine simulation.

Construction by Contour Crafting using sulfur concrete with planetary applications

2016 ◽  
Vol 22 (5) ◽  
pp. 848-856 ◽  
Author(s):  
Behrokh Khoshnevis ◽  
Xiao Yuan ◽  
Behnam Zahiri ◽  
Jing Zhang ◽  
Bin Xia
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Model ◽  
Design Methodology ◽  
Construction Material ◽  
Construction Process ◽  
Element Analysis ◽  
Content Type ◽  
Contour Crafting ◽  
Finite Element Analysis Simulation

Purpose This paper aims to report on the experiments with the Contour Crafting Automated Construction process using sulfur concrete as the choice of construction material. Design/methodology/approach Several experiments have been performed at centimeter and meter scales. A finite element analysis simulation model for the behavior of sulfur concrete-based structures has been developed. Experimental results were compared with the results of simulation. Findings Sulfur concrete has numerous terrestrial applications and is potentially an ideal construction material for planetary construction. Originality/value Experimental samples of sulfur concrete were fabricated using a novel mixer/extrusion system. The mechanism was proven to be durable and stable after more than 500 h of work.

Designs of low frictional coefficients for joint bearings by inlaying graphites and liquid spraying of MoS2

2018 ◽  
Vol 70 (9) ◽  
pp. 1630-1635 ◽  
Author(s):  
Jun Cao ◽  
Zhongwei Yin
Keyword(s):  
High Temperature ◽  
Design Methodology ◽  
Element Analysis ◽  
Content Type ◽  
Nuclear Plants ◽  
Temperature Environment ◽  
Frictional Coefficients ◽  
Practical Implications ◽  
Permissible Stresses ◽  
High Temperature Environment

PurposeThe purpose of this paper is to solve the problem of joint bearings that cannot work in high temperature because of their high frictional coefficients.Design/methodology/approachTwo methods of inlaying graphites and liquid spraying of MoS2are designed. The arrangement of graphites is shown and its frictional coefficients (COFs) are discussed. MoS2coating is deposited by liquid spraying. The ingredients of liquid spraying of MoS2are illustrated. Stresses, structure deformations and fatigue life are analyzed by finite element analysis.FindingsResults show that both two designed methods can decrease COFs effectively. All stresses are in the limit of the maximum permissible stresses. The new designed bearings can be safety worked in sealed and high temperature environment which are proved by fatigue analyses.Practical implicationsTwo new designs can help joint bearings work in nuclear plants because of their low COFs and litter wear. The new designs can improve bearings life.Originality/valueTwo methods of decreasing COFs of joint bearings are designed in this paper. The technologies are illustrated. The proper scopes of applications of two designed methods are discussed.

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