scholarly journals Analysis of PM Magnetization Field Effects on the Unbalanced Magnetic Forces due to Rotor Eccentricity in BLDC Motors

2013 ◽  
Vol 3 (4) ◽  
pp. 461-466 ◽  
Author(s):  
S. Mahdiuon-Rad ◽  
S. R. Mousavi-Aghdam ◽  
M. Reza Feyzi ◽  
M. B. B. Sharifian
Keyword(s):  
Single Phase ◽  
Brushless Dc ◽  
Magnetic Forces ◽  
Field Effects ◽  
Field Patterns ◽  
Rotor Eccentricity ◽  
Simulation Results ◽  
Harmonic Components ◽  
Magnetization Field

This paper investigates both static and dynamic eccentricities in single phase brushless DC (BLDC) motors and analyzes the effect of the PM magnetization field on unbalanced magnetic forces acting on the rotor. Three common types of PM magnetization field patterns including radial, parallel and sinusoidal magnetizations are considered. In both static and dynamic eccentricities, harmonic components of the unbalanced magnetic forces on the rotor are extracted and analyzed. Based on simulation results, the magnetization fields that produce the lowest and highest unbalanced magnetic forces are determined in rotor eccentricity conditions.

Modified Method for Minimizing Current Distortion of A Single Phase Bridge Rectifier Based on Current Injection

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Aasef Saleh Al-hyali ◽  
Hussien Zynal ◽  
Addelelah Mahmood
Keyword(s):  
Power Factor ◽  
Single Phase ◽  
Injection Technique ◽  
Nonlinear Load ◽  
Advantages And Disadvantages ◽  
Modified Method ◽  
Ac Power ◽  
Bridge Rectifier ◽  
Simulation Results ◽  
Harmonic Components

Single phase bridge controlled rectifier, nonlinear load,, produces harmonics that effects on power quality of the AC power system. These distortions cause different problems that need to be solved. Therefore, reducing harmonics is very important issue. In this paper, line injection technique is used to reduce harmonics on the ac side of the single-phase bridge controlled and uncontrolled rectifier. This method depending on injecting harmonic components of the dc converter current with an opposite phase to its ac side lines at a particular frequency to get sinusoidal wave as possible and improving the power factor. Two injection circuits are used. The simulation results of the modified suggested circuits have been compared in order to show the advantages and disadvantages of each type. Parameters of the injection circuits are chosen depending on derived mathematical equations. The system is modeled implemented by  Matlab/Simulink. Simulation results show that THD of the AC current reduced about 81% with power factor around unity.

Switching Angles Optimization of Single Phase PWM DC-AC Inverter by Particle Swarm Optimizations

2014 ◽  
Vol 18 (3) ◽  
pp. 435-442 ◽  
Author(s):  
Takuya Shindo ◽  
◽  
Kenya Jin’no
Keyword(s):  
Single Phase ◽  
Particle Swarm Optimization Algorithm ◽  
Harmonic Distortion ◽  
Particle Swarm ◽  
Design Procedure ◽  
Pso Algorithm ◽  
Evaluation Function ◽  
Swarm Optimization ◽  
Simulation Results ◽  
Harmonic Components

We consider the design procedure for a single-phase PWM DC-AC inverter using a particle swarm optimization algorithm. The switching operation is the most important component of the single-phase PWM DC-AC inverter. The PSO algorithm optimizes the switching angle effectively. The design procedure of the switching angle evaluates total harmonic distortion and the effective value of output. The proposed evaluation function restricts the scope to evaluating harmonic components. Based on numerical simulation results, we confirmed that the performance of the proposed design procedure was improved compared to the conventional sinusoidal PWM procedure. We develop an implementation circuit for our PWM DCAC inverter. By using the implemented circuit, we confirmed that results for implementation circuits are consistent with results for numerical simulations, indicating that the proposed algorithm exhibits better performance than the conventional sinusoidal PWM DC-AC inverter.

Optimizing Efficiency Driver Comprising Phase-Locked Loop for the Single-Phase Brushless DC Fan Motor

2012 ◽  
Vol 48 (5) ◽  
pp. 1937-1942 ◽  
Author(s):  
Yie-Tone Chen ◽  
Chun-Lung Chiu ◽  
Zong-Hong Tang ◽  
You-Len Liang ◽  
Ruey-Hsun Liang
Keyword(s):  
Single Phase ◽  
Phase Locked Loop ◽  
Brushless Dc

Simulation of Intrinsic Diffusion in Multicomponent Multiphase Systems

1998 ◽  
Vol 527 ◽  
Author(s):  
M. Hunkel ◽  
D. Bergner
Keyword(s):  
Single Phase ◽  
Diffusion Flux ◽  
Wind Effect ◽  
Concentration Profiles ◽  
Intrinsic Diffusion ◽  
Cross Terms ◽  
Multiphase Systems ◽  
Random Alloy ◽  
Simulation Results ◽  
Vacancy Flux

ABSTRACTA simulation model for intrinsic diffusion of multicomponent multiphase systems is presented. The model is not restricted onto a certain number of components or phases. For simplicity, Manning's random alloy model with vanishing vacancy wind effect is used. Then the cross terms of the diffusion flux can be neglected. The simulation routine uses equations for the fluxes, the equation of continuity and an equation for the change of the thickness of volume elements due to the vacancy flux. With this model diffusions paths, concentration profiles, fluxes of the components as well as marker positions can be calculated. The shift of interfaces and the growth of new phases can also be determined. The simulation results were compared with experimental data of the Cu-Fe-Ni system. Diffusion was studied in single-phase areas and across interfaces.

The Poynting Vector and the New Theory of a Transformer. Part 11. Three-Phase Three-Core Transformers without a Neutral Wire

2021 ◽  
Vol 1 (1) ◽  
pp. 23-34
Author(s):  
Mansur A. SHAKIROV ◽  
Keyword(s):  
Equivalent Circuit ◽  
Single Phase ◽  
Poynting Vector ◽  
Magnetic Circuit ◽  
Phase Zone ◽  
Field Patterns ◽  
Three Phase ◽  
Short Circuits ◽  
The Difference ◽  
Mathematical Relations

A topological equivalent circuit for a three-phase three-core transformer reflecting the spatial structure of its magnetic system is developed. Owing to this approach, it became possible to represent the magnetic fluxes of the magnetic circuit’s all main sections and the apertures for each of three phases directly in the circuit in the absence of the windings’ neutral wires. The circuit is constructed by stitching together the anatomical circuit models of single-phase transformers obtained in the previous parts with taking into account the relationships between the fluxes at the junctions of the phase zones in iron. Its validity is confirmed by the rigor nature of the physical and mathematical relations for idealized transformers with infinite magnetic permeability of iron and simplified magnetic field patterns, which corresponds to the generally accepted approach with neglecting the magnetization currents. The difference lies in the fact that the developed model takes into account the heterogeneity of magnetization in different parts of the magnetic circuit with allocating more than 30 sections in the iron and apertures. The transition to the model of a real three-core transformer is carried out by adding four nonlinear transverse magnetization branches in each extreme phase zone and eight branches in the central phase zone to the idealized equivalent circuit. It is shown that in cases of winding connections without neutral wires, there is no flux of the Poynting vector in interphase zones in any unbalanced mode. In this case, the problems connected with the occurrence of fluxes exceeding the no-load fluxes under the conditions of symmetric and asymmetric short circuits, as well as the occurrence of buckling fluxes in these modes in the region outside the transformer iron, are solved.

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