scholarly journals The Diagnostics of the rotor misalignment of a permanent magnet motor

2022 ◽  
Vol 1211 (1) ◽  
pp. 012023
Author(s):  
A A Afanasev ◽  
V S Genin ◽  
L N Vasileva ◽  
V G Grigorev
Keyword(s):  
Magnetic Field ◽  
Circular Ring ◽  
Stator Winding ◽  
Rotor Speed ◽  
Permanent Magnet Motor ◽  
Specialized Software ◽  
Brushless Motor ◽  
Electromagnetic Moment ◽  
Software And Hardware ◽  
The Magnetic Field

Abstract A mathematical model of the magnetic field in the working gap of a brushless motor is considered in a case of rotor misalignment arising during manufacture, for example, due to defects in end shields, or in operation due to bearing wear. a gap in a uniform (circular ring). The stator gearing is taken into account on average using the Carter coefficient, the magnetic field in the inhomogeneous air gap, created by the rotor magnets and the stator winding current, is assumed to be plane-parallel, having a two-dimensional character. It was found that the rotor misalignment associated with the rotational movement of the eccentricity causes nonsinusoidality of the idle EMF and pulsation of the electromagnetic moment with a frequency 3p times higher than the rotor speed. When the eccentricity is stationary, a variable EMF is induced along the rotor shaft, causing an alternating current in the circuit: shaft-bearings-bearing shields-stator housing. To clarify the nature of the defect in order to identify the actual misalignment of the rotor, it is recommended to control currents and voltages using specialized software and hardware complexes for spectrum analysis.

scholarly journals A comparative analysis of the parameters of a rotating magnetic field inductor when using concentric and loop windings

2021 ◽  
pp. 12-18
Author(s):  
V. I. Milykh ◽  
M. G. Tymin
Keyword(s):  
Magnetic Field ◽  
Single Layer ◽  
Rotating Magnetic Field ◽  
Geometrical Parameters ◽  
Stator Winding ◽  
Electromagnetic Parameters ◽  
Working Chamber ◽  
Three Phase ◽  
Technological Processing ◽  
The Magnetic Field

Introduction. Three-phase inductors of a rotating magnetic field are used in grinders, separators and stirrers for the technological processing of bulk and liquid substances. This occurs in a cylindrical working chamber under the influence of ferromagnetic elements in the form of pieces of iron wire, which move together with the field. Problem. By analogy with three-phase induction motors, for the stator of inductors a concentric winding is adopted, which is a diametric single-layer winding. When moving from such motors to an inductor, its operating conditions have changed due to the significantly increased non-magnetic space inside the inductor compared to the motor clearances. The difference in the frontal parts of the phase windings has become essential for the electromagnetic parameters and the structure of the magnetic field in the inductor working chamber. Therefore, a loop shortened stator winding, which is symmetrical, can be considered as an alternative to a concentric diametric winding. Goal. The aim of the work is to compare the dimensional and electromagnetic parameters of a rotating magnetic field inductor in two versions of its three-phase winding: concentric single-layer diametrical and loop shortened two-layer. Methodology. Comparison of the windings is carried out through a detailed analysis of the geometrical parameters of their frontal parts, as well as through numerical-field calculations of the electromagnetic parameters of the inductor as a whole and the distribution of the magnetic field in its working chamber. Results. A significant difference in the geometrical parameters of the frontal parts of the two windings under inductor conditions was revealed. The loop version of the winding makes it possible to reduce the length of the winding conductor, its active resistance, as well as the reactance of its frontal dissipation. At the same time the asymmetry of the phase windings is excluded and an increase in the homogeneity of the magnetic field in the inductor working chamber is provided. Originality. The scientific novelty of the work lies in the development of a method of comparative analysis of the windings under the conditions of the rotating magnetic field inductor and in revealing the advantages of a loop shortened winding compared to the used concentric diametric winding. Practical value. The loop shortened stator winding recommended for the inductor will eliminate the asymmetry of its electromagnetic system. Thereby, the quality of its work in the technological processing of different substances is significantly increased due to ensuring the homogeneity of the magnetic field in the working chamber. At the same time, the copper conductor of the winding is still saved, and the efficiency of the inductor is also increased by reducing the power of electrical losses.

MAIN CHARACTERISTICS ELECTRIC VIBRATORS BASED ON A LINEAR MOTOR WITH PERMANENT MAGNETS

2021 ◽  
Vol 4 (3) ◽  
pp. 4-10
Author(s):  
Kamoliddin Oqyolov ◽  
◽  
Nurzod Abduqodirov ◽  
Gulnoza Jalilova ◽  
Nuriddin Abduxakimov
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Experimental Studies ◽  
Calculated Data ◽  
Linear Motor ◽  
Stator Winding ◽  
The Finite Element Method ◽  
Magnetic Forces ◽  
Electro Magnetic ◽  
The Magnetic Field

The design of an electric vibrator created on the basis of a linear motor with permanent magnets is considered, and the calculation of the magnetic field and the electromagnetic force acting on the motor armature is performed by the finite element method. The results of experimental studies confirming the reliability of the obtained calculated data are presented]. The purpose of this work is to study the distribution of the magnetic field and the electro-magnetic forces in a coaxial-linear permanent magnet electric motor (PM), which is the basis for the creation of avibration installationKeywords: vibration, magnets, magnetic induction, stator winding, electric vibrator

Hybrid Synchronous Motor Magnetic Field Analysis

2015 ◽  
Vol 792 ◽  
pp. 26-32
Author(s):  
Elena E. Suvorkova ◽  
Yuriy N. Dementiev ◽  
Lev K. Burulko
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Synchronous Motor ◽  
Field Analysis ◽  
Permanent Magnet Motor ◽  
Magnetic Field Analysis ◽  
Hybrid Motor ◽  
The Magnetic Field ◽  
Starting Torque ◽  
Made In

This paper introduces researching results of hybrid synchronous motor rotor permanent-magnet part magnets’ magnetization influence on its starting torque. The magnetic field analysis is made in reluctance synchronous motor and synchronous permanent-magnet motor, as main parts of the hybrid motor.

Magnetic Evaluation for Uprating 400 mW Coal Fired Generator

2015 ◽  
Vol 799-800 ◽  
pp. 1356-1360
Author(s):  
Imam Djunaedi ◽  
Hilman Syaeful Alam ◽  
Aditya Sukma Nugraha
Keyword(s):  
Magnetic Field ◽  
Power Plants ◽  
Magnetic Saturation ◽  
Stator Winding ◽  
Operating Life ◽  
The Core ◽  
Magnetic Analysis ◽  
Current Design ◽  
Full Class ◽  
The Magnetic Field

One of the considerations many power plants today is whether they can get more power out of their existing equipment especially generator. However, it is required design review and feasibility study in order to extend the operating life and increase the capability and reliability. In this study, analysis of magnetic field was performed due to power uprating in order to prevent a saturation of the magnetic field in the core laminate which can lead to the emergence of heat concentration. Based on the results of magnetic analysis using finite element, there are no saturation of the magnetic field in the core lamination which can lead to the magnetic saturation and heat concentration, both for existing and uprating conditions.Therefore, the increasing a design margin on the generators from the current design of the margin of 471,000 kVA to 494,550 kVA with the 0.85 power factor will not pose a problem as long as all of the following recommendations can be implemented. Although it is predicted, there will be no saturation and hotspots on the generator, but the risk of temperature rise due to the uprating should be reduced by replacing the stator winding using the Full Class F Insulation which is resistant to temperatures up to 155 °C.

scholarly journals Calculation and study of the magnetic field of the stator winding of a turbine generator

2020 ◽  
Vol 216 ◽  
pp. 01118
Author(s):  
Gulzoda Mustafakulova ◽  
Akmal Egamov ◽  
Utkir Mirkhonov ◽  
Jasurbek Nizamov
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Laplace Equation ◽  
Analytical Method ◽  
Magnetic Circuit ◽  
Stator Winding ◽  
Turbine Generator ◽  
Magnetic Circuits ◽  
The Magnetic Field ◽  
A Current

An analytical method is presented for calculating the electromagnetic field of the stator winding of an alternating current machine, a turbine generator by solving the Laplace equation, first for a point conductor with a current i, by the method of separating variables when representing the space of the machine location consisting of five regions. The purpose of the work is to show that for all three components of the air gap field created by the winding, the magnetic circuit is common, but the magnetic circuits are different for each of them.

Analysis of the magnetic field in a permanent-magnet motor, carried out by the finite element method

1989 ◽  
Vol 72 (1) ◽  
pp. 1-5 ◽  
Author(s):  
V. N. Savov ◽  
Zh. D. Georgiev ◽  
E. S. Bogdanov
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
The Finite Element Method ◽  
Permanent Magnet Motor ◽  
The Magnetic Field ◽  
Element Method

scholarly journals Does the magnetic field of a multipole stator winding drive flow of a ferrofluid in a cylindrical container?

2010 ◽  
Vol 9 ◽  
pp. 152-155
Author(s):  
Isaac Torres-Díaz ◽  
Carlos Rinaldi
Keyword(s):  
Magnetic Field ◽  
Stator Winding ◽  
Cylindrical Container ◽  
The Magnetic Field

scholarly journals Effect of a Uniform Magnetic Field on Corrosion of Ni-Al Bronze in 3.5 wt% NaCl

CORROSION ◽  
10.5006/2531 ◽  
2017 ◽  
Vol 74 (2) ◽  
pp. 197-209 ◽  
Author(s):  
Hedda Nordby Krogstad ◽  
Roy Johnsen ◽  
Michael Coey
Keyword(s):  
Magnetic Field ◽  
Uniform Magnetic Field ◽  
Corrosion Current ◽  
Anodic Current Density ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Permanent Magnet Motor ◽  
Anodic Current ◽  
Rotating Disc ◽  
The Magnetic Field

Following the observation of enhanced corrosion of parts of a seawater-immersed permanent magnet motor made from Ni-Al bronze, a laboratory study of the effect of uniform magnetic field on the corrosion of this alloy in a 3.5 wt% NaCl solution has been performed. The results have been compared with measurements of enhanced convection with a rotating disc electrode. The largest effect of the magnetic field was an enhancement of the anodic current density of 52% in a field of 800 mT. This enhancement was equivalent to that resulting from gentle stirring with the rotating disc electrode with diameter 10 mm at 20 rpm. The increase in corrosion current varied with the magnitude of both the magnetic field and the initial corrosion current, and increased with both. The effect can be explained in terms of the Lorentz force, and modeling was performed to quantify the flow induced in the electrolyte by this force.

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