scholarly journals Lumped Parameter Model and Electromagnetic Performance Analysis of a Single-Sided Variable Flux Permanent Magnet Linear Machine

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5494
Author(s):  
Basharat Ullah ◽  
Faisal Khan ◽  
Muhammad Qasim ◽  
Bakhtiar Khan ◽  
Ahmad H. Milyani ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Thrust Force ◽  
Lumped Parameter Model ◽  
Computational Time ◽  
Design Parameters ◽  
3D Analysis ◽  
Flux Linkage ◽  
Lumped Parameter ◽  
Variable Flux ◽  
Linear Machine

A new Single-sided Variable Flux Permanent Magnet Linear Machine with flux bridge in mover core is proposed in this paper. The flux bridge prevents the leakage flux from the mover and converts it into flux linkage, which greatly influences the performance of the machine. First, a lumped parameter model is used to find the suitable coil combination and no-load flux linkage of the proposed machine, which greatly reduces the computational time and drive storage. Secondly, the proposed machine replaces the expensive rare earth permanent magnets with ferrite magnets and provides improved flux controlling capability under variable excitation currents. Multivariable geometric optimization is utilized to optimize the leading design parameters like split ratio, stator pole width, width and height of permanent magnet, flux bridge width, the width of mover’s tooth, and stator slot depth at constant electric and magnetic loading. The optimized design increases the flux linkage by 44.11%, average thrust force by 35%, thrust force density by 35.02%, minimizes ripples in thrust force by 23%, and detent force by 87.5%. Furthermore, the results obtained by 2D analysis are verified by 3D analysis. Thermal analysis is done to set the operating limit of the proposed machine.

Analysis of a Pneumatically Coupled Cam-Actuated Mechanism

1981 ◽  
Vol 103 (3) ◽  
pp. 290-292
Author(s):  
S. LeQuoc ◽  
R. M. H. Cheng
Keyword(s):  
Amplitude Ratio ◽  
Nonlinear Function ◽  
Design Tool ◽  
Lumped Parameter Model ◽  
Design Parameters ◽  
Damping Factor ◽  
Resonance Amplitude ◽  
Orifice Area ◽  
Lumped Parameter ◽  
Wear And Tear

Cam-actuated mechanism with a pneumtic coupling is a design improvement upon the conventional system. Pneumatic dashpots are used which provide a cushioning effect, thus reducing the wear and tear of system components. This paper investigates the dynamic behavior of such a system based on a lumped parameter model with a damping factor which is a nonlinear function of the frequency. A digital computer is used as a design tool to determine the effect on the performance of changing design parameters. It is found that the system amplitude ratio peak depends largely upon the pneumatic damper orifice area and that a proper selection of the orifice area will yield a minimum resonance amplitude ratio.

Highly Reduced Lumped Parameter Models Representing Impedance Functions at the Interface of One-Dimensional Viscoelastic Continua

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Masato Saitoh
Keyword(s):  
Degrees Of Freedom ◽  
Reaction Force ◽  
Lumped Parameter Model ◽  
Computational Time ◽  
Dynamic Problems ◽  
Modal Expansion ◽  
Mass Element ◽  
Lumped Parameter ◽  
In Series ◽  
Impedance Functions

In recent dynamic problems dealing with high-frequency excitations, such as ultrasonic vibrations, a proper representation of rods transmitting kinetic energy from the interface attached to the vibrating system to the other end is strongly demanded for effectively reducing computational time and domain. A highly reduced lumped parameter model that properly simulates the dynamic characteristics of a uniform, isotropic, homogeneous, and viscoelastic rod subjected to excitations at its end is proposed in this paper. The model consists of springs, dashpots, and so called “gyro-mass elements.” The gyro-mass element generates a reaction force proportional to the relative acceleration of the nodes between which it is placed. This model consists of units arranged in series, each unit consisting of a spring, a dashpot, and a gyro-mass element arranged in parallel. A formula is proposed for determining the properties of the elements in the units based on the modal expansion. The results show that a notable reduction of 90% in the degrees of freedom is accomplished with high accuracy by using the proposed model consisting of a set of units associated with modes in a target frequency region and a supplemental unit associated with residual stiffness, which is advantageous for efficient numerical computations in recent dynamic problems.

Lumped-Parameter Network Thermal Analysis of Permanent Magnet Synchronous Motor

2014 ◽  
Vol 792 ◽  
pp. 233-238 ◽  
Author(s):  
Konstantinos Dimolikas ◽  
Themistoklis D. Kefalas ◽  
Petros Karaisas ◽  
Zachos K. Papazacharopoulos ◽  
Antonios G. Kladas
Keyword(s):  
Permanent Magnet ◽  
Transient Analysis ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Lumped Parameter Model ◽  
Network Configuration ◽  
Aerospace Application ◽  
Lumped Parameter ◽  
Thermal Chamber ◽  
Thermal Transient Analysis

This paper develops a model based on an original lumped-parameter network configuration for the thermal transient analysis of a permanent magnet synchronous motor (PMSM). The specific PMSM was designed and optimized for a demanding aerospace application. The validity of the proposed lumped-parameter model is verified by measurements carried out in a thermal chamber.

scholarly journals Improvement of Tubular Permanent Magnet Machine Performance Using Dual-Segment Halbach Array

2018 ◽  
Author(s):  
Minh-Trung Duong ◽  
Yon-Do Chun
Keyword(s):  
Permanent Magnet ◽  
Flux Density ◽  
Output Power ◽  
Flux Linkage ◽  
Improve Performance ◽  
Machine Performance ◽  
Halbach Array ◽  
Proposed Model ◽  
Flux Leakage ◽  
Linear Machine

In this paper, modification of dual-Halbach permanent magnet (PM) array is investigated to improve performance of tubular linear machine, in terms of flux density and output power. Instead of a classical Halbach array with only radial and axial PMs, proposed model involves insertion of mig-magnets, which have magnetized angle shifted from the reference magnetized angles of axial and radial PMs. This structure leads to elimination of flux leakage and concentration of flux linkage in middle of the coil; therefore, the performance of machine is increased.

Modified Flux Linkage Observer for Sensorless Direct Thrust Force Control of Linear Vernier Permanent Magnet Motor

2019 ◽  
Vol 34 (8) ◽  
pp. 7800-7811 ◽  
Author(s):  
Wenxiang Zhao ◽  
Anchen Yang ◽  
Jinghua Ji ◽  
Qian Chen ◽  
Jihong Zhu
Keyword(s):  
Permanent Magnet ◽  
Force Control ◽  
Thrust Force ◽  
Flux Linkage ◽  
Permanent Magnet Motor

Novel linear switched-flux PM machine with 9/10 primary/secondary pole number combination

2015 ◽  
Vol 34 (6) ◽  
pp. 1656-1672 ◽  
Author(s):  
Qinfen Lu ◽  
Yanxin Li ◽  
Yunyue Ye ◽  
J.T. Chen ◽  
Z.Q. Zhu
Keyword(s):  
Permanent Magnet ◽  
Thrust Force ◽  
Load Condition ◽  
Design Parameters ◽  
Force Density ◽  
Direct Drive ◽  
Low Thrust ◽  
Element Analysis ◽  
Content Type ◽  
Force Ripple

Purpose – Due to linear structure, linear switched flux permanent magnet machines (LSFPMMs) also may have odd pole primary, such as 9, 15, 21, etc., without unbalanced magnetic force in equivalent rotary machines. The paper aims to discuss these issues. Design/methodology/approach – In order to increase the thrust force density, the influence of some major design parameters, including split ratio, PM thickness, primary slot width and secondary pole width, are investigated by finite element analysis. For reducing the thrust force ripple under on-load condition, the end auxiliary teeth are adopted and their positions are also optimized. Findings – This novel 9/10 primary/secondary poles LSFPMM has high average thrust force and low thrust force ripple by optimization. The results demonstrate that the odd pole primary may be a good candidate for long-stroke linear direct drive application. Originality/value – A novel 9/10 primary/secondary poles linear switched flux permanent magnet machine is developed in this paper. The similar conclusions could be obtained for other LSFPMMs with odd pole primary.

scholarly journals Analysis of design parameters of round-window stimulating type electromagnetic transducer by a nonlinear lumped parameter model of implanted human ear

2022 ◽  
Vol 19 (3) ◽  
pp. 2453-2470
Author(s):  
Zhaohai Liu ◽  
◽  
Houguang Liu ◽  
Jie Wang ◽  
Jianhua Yang ◽  
...  
Keyword(s):  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Round Window ◽  
Lumped Parameter Model ◽  
Design Parameters ◽  
Electromechanical Coupling Coefficient ◽  
Main Design ◽  
Lumped Parameter ◽  
Human Ear ◽  
Hearing Compensation

<abstract> <p>Round-window stimulating transducer is a new solution to treat mixed hearing loss. To uncover the factors affecting the round-window stimulation's performance, we investigated the influence of four main design parameters of round-window stimulating type electromagnetic transducer. Firstly, we constructed a human ear nonlinear lumped parameter model and confirmed its validity by comparing the stapes responses predicted by the model with the experimental data. Following this, an electromagnetic transducer's mechanical model, which simulates the floating mass transducer, was built and coupled to the human ear model; thereby, we established a nonlinear lumped parameter model of implanted human ear under round-window stimulation and verified its reliability. Finally, based on this model, the influences of the four main design parameters, i.e., the excitation voltage, the electromechanical coupling coefficient, the support stiffness, and the preload force, were analyzed. The results show that the change of excitation voltage does not alter the system's natural frequency. Chaotic motion occurs when the electromechanical coupling coefficient is small. Meanwhile, the stapes displacement appears to increase firstly and then decrease with the increase of the electromechanical coupling coefficient. The increase of the support stiffness enlarges the resonance frequency of the stapes displacement and reduces the stapes displacement near the resonance frequency, deteriorating the transducer's hearing compensation at low frequency. The preload force can improve the transducer's hearing compensation performance in mid-high frequency region.</p> </abstract>

Design and Modelling of a Portable Pico Linear Generator for Wave Energy Conversion System

2015 ◽  
Vol 785 ◽  
pp. 300-304
Author(s):  
Muhammad Faris Mohammad Naafi ◽  
Taib Ibrahim ◽  
Nursyarizal Mohd Noor ◽  
Muhammad Aizuddin Firdaus bin Mohamad Hamim
Keyword(s):  
Permanent Magnet ◽  
Wave Energy ◽  
Flux Distribution ◽  
Thrust Force ◽  
Wave Energy Conversion ◽  
Flux Linkage ◽  
Energy Converter ◽  
Linear Generator ◽  
Software Comparison ◽  
Energy Conversion System

This paper will focus on designing and modelling the portable pico linear generator for the wave energy converter application. The aim for this research is to develop a permanent magnet linear generator which has the weight less than 20 kg and can produce up to 80 W. A thorough literature review has been done on type of configurations, stator structure, magnetization and type of cored to select the best features of the linear generator. Three proposed designs of the permanent magnet linear generator is presented and each of the proposed design performance is simulated using the Ansys Maxwell software. Comparison on the preliminary result such as the air gap flux distribution, back-emf, flux linkage and thrust force of the three proposed designs will be shown and discussed.

Sign in / Sign up

Export Citation Format

Share Document