scholarly journals Design and Thermal Modeling of Modular Hybrid Excited Double-Sided Linear Flux Switching Machine

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8511
Author(s):  
Himayat Ullah Jan ◽  
Faisal Khan ◽  
Basharat Ullah ◽  
Muhammad Qasim ◽  
Malak Adnan Khan ◽  
...  
Keyword(s):  
Equivalent Circuit Model ◽  
Geometric Optimization ◽  
Force Density ◽  
Iron Core ◽  
Lower Efficiency ◽  
Split Ratio ◽  
Iron Losses ◽  
Tooth Width ◽  
Dc Excitation ◽  
Long Stroke

This paper presents a Hybrid Excited Double-Sided Linear Flux Switching Machine (HEDSLFSM) with a crooked tooth modular stator. Generally, the conventional stators are made of a full-length iron core, increasing manufacturing costs and iron losses. Higher iron losses result in lower efficiency and lower overall performance. A U-shaped modular stator with a crooked tooth is used to lower iron consumption and increase the machine’s efficiency. Ferrite magnets are used to replace rare earth magnets, which also reduces the machine cost. Two DC excitation windings are used above and below the ferrite magnet to reduce the PM volume. 2D electromagnetic performance analysis is done to observe the key performance indices. Geometric optimization is used to optimize the Split Ratio (S.R), DC winding slot area (DCw), and AC winding slot area (ACw). Stator Tooth Width (STW), space between the modules (S.S.), and crooked angle (α) are optimized through JMAG in-built Genetic Algorithm (G.A.) optimization. High thrust force density and modular stator make it a good candidate for long-stroke applications like railway transits. The thermal analysis of the machine is performed by FEA analysis and then validated by 2D LPMC (Lumped Parametric Magnetic Equivalent Circuit) model. Both analyses are compared, and an error percentage of less than 4% is achieved.

scholarly journals Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2781 ◽  
Author(s):  
Noman Ullah ◽  
Abdul Basit ◽  
Faisal Khan ◽  
Wasiq Ullah ◽  
Mohsin Shahzad ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Thrust Force ◽  
Low Cost ◽  
Harmonic Distortion ◽  
Geometric Optimization ◽  
Force Density ◽  
Permanent Magnet Machines ◽  
Force Ripple ◽  
Long Stroke

Double sided linear flux switching permanent magnet machines (DSLFSPMMs) exhibit high thrust force density, high efficiency, low cost and robust double salient secondary (stator) structures. The aforementioned unique features make DSLFSPMM suitable for long stroke applications. However, distorted flux linkage waveforms and high detent forces can exaggerate thrust force ripples and reduce their applicability in many areas. In order to enhance thrust force performance, reduce thrust force ripple ratio and total harmonic distortion (THD) of no-load flux linkages, two structure-based advancements are introduced in this work, i.e., asynchronous mover slot and stator tooth displacement technique (AMSSTDT) and the addition of an active permanent magnet end slot (APMES). Furthermore, single variable geometric optimization (SVGO) is carried out by the finite element method (FEM).

Development of High-Force-Density Iron-Core Linear Synchronous Motor

2012 ◽  
Vol 132 (4) ◽  
pp. 480-486 ◽  
Author(s):  
Masanobu Kakihara ◽  
Toshiyuki Hoshi ◽  
Toru Shikayama ◽  
Motomichi Ohto
Keyword(s):  
Synchronous Motor ◽  
Force Density ◽  
Iron Core ◽  
Linear Synchronous Motor

Detent Force Modeling and Analysis for Vertical Permanent-Magnet Linear Synchronous Motor Using Equivalent Magnetic Network Method

2011 ◽  
Vol 143-144 ◽  
pp. 148-153 ◽  
Author(s):  
Xiao Zhuo Xu ◽  
Xu Dong Wang ◽  
Hai Chao Feng ◽  
Ji Kai Si
Keyword(s):  
Permanent Magnet ◽  
Equivalent Circuit Model ◽  
Synchronous Motor ◽  
Iron Core ◽  
Modeling And Analysis ◽  
Force Modeling ◽  
Detent Force ◽  
Linear Synchronous Motor ◽  
Calculation Results ◽  
Magnetic Network

This paper investigates the detent force modeling of a slotted iron core type vertical permanent magnet linear synchronous motor (PMLSM) for ropeless elevator applications. Variable network non-linear magnetic equivalent circuit model is established to predict the detent force of PMLSM. The topology structure of equivalent magnetic circuit is developed and the permeances are derived and calculated. The end effect of two end teeth is essential for analysis of detent force and it is focused in the modeling. Magnetic saturation of primary iron-core also be taken into account. In final some 3-D finite-element numerical calculation results are used to validate the feasibility of the proposed method.

Optimal Design of a Double-Sided Permanent Magnet Linear Synchronous Motor for Ropeless Elevator System

2013 ◽  
Vol 416-417 ◽  
pp. 99-103
Author(s):  
Li Ren Huang ◽  
Ji Wei Dong ◽  
Qin Fen Lu ◽  
Yun Yue Ye ◽  
Yi Chen
Keyword(s):  
Permanent Magnet ◽  
Low Cost ◽  
Element Model ◽  
Synchronous Motor ◽  
Underground Mines ◽  
Force Density ◽  
Iron Core ◽  
Linear Synchronous Motor ◽  
Deep Underground ◽  
Force Ripple

The ropeless elevator driven by linear motor is expected to be a new solution to vertical transportation of skyscrapers and the deep underground mines. Due to high thrust force density, low force ripple and low cost etc., a double-sided permanent magnet linear synchronous motor (DPMLSM) with slotted iron core and multi-segment primary is proposed and designed. Based on the erected 2D finite element model, the structure is optimized in order to reduce the detent force. Moreover, the influence of manufacture error on force performance is also investigated. It is shown the proposed DPMLSM is suitable for the ropeless elevator.

scholarly journals Evaluation of Methodology for Lightning Impulse Voltage Distribution over High-Voltage Windings of Inductive Voltage Transformers

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5144
Author(s):  
Bojan Trkulja ◽  
Ana Drandić ◽  
Viktor Milardić ◽  
Igor Žiger
Keyword(s):  
High Voltage ◽  
Equivalent Circuit Model ◽  
Boundary Element Methods ◽  
Design Stage ◽  
Iron Core ◽  
Voltage Distribution ◽  
Specific Design ◽  
Impulse Voltage ◽  
Lightning Impulse ◽  
Capacitance Matrix

Knowledge of lightning impulse (LI) voltage distribution over transformer windings during the design stage of the transformer is very important. Specific design differences in inductive voltage transformers make the transient analysis approach different to the approach to the power transformers. In this paper, a methodology for acquiring lightning impulse voltage distribution over high-voltage (HV) winding of inductive voltage transformers is presented and evaluated. Resistance, inductance, and capacitance matrices are calculated using the integral and boundary element methods (BEM) approach. Additionally, in order to improve the capacitance matrix solver, adaptive cross approximation (ACA) is applied. These parameters are then used to solve the equivalent circuit model in time domain. In order to evaluate the methodology, an experimental and numerical investigation of the layer discretisation, iron core influence, and accuracy of the proposed methodology is performed. The comparison of numerical results with measurements confirms the validity of the methodology.

Embedded Simple Excited Automotive Alternator Modeling using Magnetic Equivalent Circuits

2017 ◽  
Vol 7 (3) ◽  
pp. 1145
Author(s):  
Moufida Klach ◽  
Helmi Aloui ◽  
Rafik Neji ◽  
Mohamed Gabsi ◽  
Michel Lecrivain
Keyword(s):  
Numerical Method ◽  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Saturation Effect ◽  
Equivalent Circuits ◽  
Resistive Load ◽  
Dc Excitation ◽  
Automotive Alternator ◽  
Excitation Winding

This paper presents the modeling by Magnetic Equivalent Circuit model (MEC) of a Simple Excited Automotive Alternator (SE2A) where DC-excitation winding is transferred from rotor side to statorone rather than in conventional automotive claw pole alternators, to overcome the disadvantages of the ring-brush system. Following the resolution of the MEC using Newthon-Raphson numerical method, the alternator performances at both no-load and under resistive load regimes is achieved considering the saturation effect. It has been found that alternator’s performances carried out using the proposed MEC are with closed proximity to experimental records on a built prototype of the considered alternator.

scholarly journals A Double-Sided Linear Primary Permanent Magnet Vernier Machine

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yi Du ◽  
Chunhua Zou ◽  
Xianxing Liu
Keyword(s):  
Permanent Magnet ◽  
Power Factor ◽  
Thrust Force ◽  
Force Density ◽  
Iron Core ◽  
Element Analysis ◽  
Detent Force ◽  
The Finite Element Analysis ◽  
High Thrust ◽  
New Machine

The purpose of this paper is to present a new double-sided linear primary permanent magnet (PM) vernier (DSLPPMV) machine, which can offer high thrust force, low detent force, and improved power factor. Both PMs and windings of the proposed machine are on the short translator, while the long stator is designed as a double-sided simple iron core with salient teeth so that it is very robust to transmit high thrust force. The key of this new machine is the introduction of double stator and the elimination of translator yoke, so that the inductance and the volume of the machine can be reduced. Hence, the proposed machine offers improved power factor and thrust force density. The electromagnetic performances of the proposed machine are analyzed including flux, no-load EMF, thrust force density, and inductance. Based on using the finite element analysis, the characteristics and performances of the proposed machine are assessed.

scholarly journals Design and Analysis of Tubular Slotted Linear Generators for Direct Drive Wave Energy Conversion Systems

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6171
Author(s):  
Naily Akmal Mohd Zamri ◽  
Taib Ibrahim ◽  
Nursyarizal Mohd Nor
Keyword(s):  
Wave Energy ◽  
Attractive Alternative ◽  
Direct Drive ◽  
Element Analysis ◽  
Split Ratio ◽  
Tooth Width ◽  
Vertical Speed ◽  
Energy Conversion Systems ◽  
Pitch Ratio ◽  
Main Dimension

Linear generator utilization in a wave energy converter (WEC) is an attractive alternative to a rotary generator. This paper presents the design of a permanent magnet linear machine (PMLM) for WEC applications in low wave power areas. In this paper, the wave height and vertical speed of Malaysian water is used for the simulation and design. Two design variants are introduced which are tubular PMLM with no spacer (TPMLM-NS) and tubular PMLM with spacer (TPMLM-S). Finite element analysis (FEA) has been conducted to investigate the performance and to refine the main dimensions of the design in terms of split ratio, pitch ratio and tooth width. The FEA results are then validated using an analytical method which is established according to the design’s magnetic field distribution. Based on main dimension refinement, it can be deduced that both the split ratio and the pitch ratio have a significant influence on the airgap flux density and back EMF of the design. The obtained FEA results also reveal that the TPMLM-NS variant is capable of producing 240 V back EMF, 1 kW output power with satisfactory efficiency. Consequently, this indicates the capability of the design to convert wave energy with good performance. Additionally, good agreement between the analytical predictions and FEA results was obtained with a low percentage of error, thus providing concrete assurance of the accuracy of the design.

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