scholarly journals STACKED DELTA DESIGN OF THREE-PHASE PERMANENT-MAGNET FAULT CURRENT LIMITERS

2021 ◽  
Vol 18 (1) ◽  
pp. 26-35
Author(s):  
Mohamed ELADAWY ◽  
Ibrahim Metwally
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Finite Element Simulation ◽  
Voltage Drop ◽  
Dynamic Performance ◽  
Iron Core ◽  
Fault Current ◽  
Element Simulation ◽  
Three Phase ◽  
Realistic Representation

This paper proposes an improvement for the dynamic performance of presaturated stacked permanent magnet biased three-phase fault current limiter (PMFCL) through COMSOL finite element simulation. The nonlinear demagnetization behavior of the permanent magnet, especially in the upper part of the B-H curve with negative magnetic field intensity, has been modelled through the Jiles-Atherton method. This enables a realistic representation of the PMFCL dynamic behavior throughout its entire operations of pre-fault, fault and fault removal, respectively. The experimental measurements have been considered to validate the trends of the simulation outcomes during the entire operation of PMFCL. Extensive finite element simulation shows that the stacked design of PMFCL can increase the capability of fault current limiting with proper selection of the number and arrangement of the AC coils around the iron core (soft magnet). Results reveal that the division of AC coils into series differential connected subcoils, with an even number, can increase the limiting capability with increasing the AC coil number of turns, without exceeding the permissible tolerances of voltage drop and power losses. Moreover, this stacked design is subjected to parametric investigation for different fault types, either symmetrical or unsymmetrical, or even when changing the fault current peak value.

Dynamic Characteristics Analysis and Finite Element Simulation of Steel–BFPC Machine Tool Joint Surface

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Jiaxing Shen ◽  
Ping Xu ◽  
Yinghua Yu
Keyword(s):  
Neural Network ◽  
Finite Element ◽  
Machine Tool ◽  
Finite Element Simulation ◽  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Joint Surface ◽  
Element Simulation ◽  
Neural Network Prediction ◽  
Network Prediction

Abstract The dynamic performance of the steel–Basalt fiber polymer concrete (BFPC) machine tool joint surface (referred to as the joint surface) has a significant impact on the overall BFPC machine tool performance; however, its dynamic characteristics remain unclear. In order to solve this problem, the influence of roughness and surface pressure on the dynamic performance of joint surface was studied experimentally, and a neural network prediction model for the dynamic performance of the joint surface was established. A BFPC bed was designed and manufactured, and BFPC bed’s dynamic performance was tested experimentally. The finite element simulation model of BFPC bed was established with equivalent spring-damper element. The BFPC bed’s dynamic performance without considering the influence of the joint surface and considering the influence of the joint surface was studied separately. The results show that the maximum error of the natural frequency of the BFPC bed was 6.937% considering the influence of the joint surface, which was much lower than the error without considering the influence of the joint surface. The maximum amplitude error of the X-axis and Z-axis acceleration of the BFPC bed was 6.917% and 5.15%, which were much smaller than the error without considering the influence of the joint surface. It proves the accuracy of the neural network prediction model for dynamic performance of the joint surface and the validity of the finite element simulation method for the joint surface. It provides theoretical support for the design analysis of BFPC machine tool.

Cogging Torque Reducing in Dual-Rotor Motor by Suitable Selection Inner and Outer Slot Opening Widths

2011 ◽  
Vol 383-390 ◽  
pp. 490-496
Author(s):  
Jia Kuan Xia ◽  
Yu Ji Zhao ◽  
Cheng Yuan Wang ◽  
Ting Dong
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Finite Element Simulation ◽  
Simulation Method ◽  
Reverse Phase ◽  
Cogging Torque ◽  
Element Simulation ◽  
Torque Curve ◽  
Slot Opening ◽  
Selection Of

In order to reduce the cogging torque in dual-rotor permanent magnet (PM) ring torque motor, the expression of cogging torque is deduced on the motor, and the influence rules of the resulting cogging torque are analyzed with change the inner and outer slot opening widths. According to the dual-rotor PM ring torque machine, the method for reducing the cogging torque amplitude and leading a reverse phase torque curve by suitable selection of the inner and outer slot opening widths is proposed. The results of simulation show that selecting the appropriate slot opening widths can effectively reduce cogging torque by the finite element simulation method.

Design of Five-Phase Transformer through Finite Element Simulation

2015 ◽  
Vol 761 ◽  
pp. 12-16
Author(s):  
Kasrul Abdul Karim ◽  
Lim Geok Yin ◽  
Nor Azizah Mohd Yusoff ◽  
Md Nazri Othman ◽  
Auzani Jidin
Keyword(s):  
Finite Element ◽  
Finite Elements ◽  
Finite Element Simulation ◽  
Design Process ◽  
Phase Angle ◽  
Motor Drive ◽  
Diagram Method ◽  
Element Simulation ◽  
Three Phase ◽  
Simulation Results

The interests in multiphase (more than three) system are escalating recently especially in the motor drive applications. Thus, this paper introduces the graphical phasor diagram method in designing the multiphase transformer connection. The proposed method eases the design process of the static multiphase transformer that produces multiphase output from the standard three phase input. The transformer connection was simulated in ANSYS Maxwell and the multiphase waveform with appropriate phase angle was obtained. The design of five-phase transformer using graphical phasor and simulation results from the finite elements software are presented in this paper.

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