Influence Of Permanent Magnetic Field Research Articles

RESEARCH ON WORK OF A STEPPER MOTOR OF ELECTRICITY METERS UNDER THE INFLUENCE OF AN EXTERNAL PERMANENT MAGNETIC FIELD CREATED WITH THE PURPOSE OF UNCOUNTED CONSUMPTION OF ELECTRIC ENERGY

Research on facts and circumstances of electrical energy uncounted consumption in the practice of conducting electrical engineering forensic examination is one of the most common. Study of the influence of a permanent magnetic field on operation of the electromechanical electricity meters is one of the areas of electrical engineering research, where scientific and practical analysis is absent in electrical engineering forensic examination. The tasks solved by electrical engineering forensic examination of electricity meters subjected to interference in their work due to the influence of an external permanent magnetic field are still being solved indirectly, mainly by examining the state of indicators of the effect of a magnetic field.
 The Article purpose is to determine the mechanism of interference in the operation of a stepper motor of electromechanical electricity meters of energy accounting meters under the influence of an external magnetic field artificially developed to disregard the consumption of electric power.
 The article examines the structure of a stepper motor of electronic-mechanical devices metering electric power. A research model of a stepper motor is built. The analysis of distribution of force magnetic lines in the magnetic system and in the magnetic shield of a stepper motor as a result of influence of an external magnetic field artificially created for the purpose of uncounted consumption of electric power in the absence of such an effect on the basis of modeling with the use of software and a mathematical apparatus: the finite element method. The mechanism of interference in the regular operation of a stepper motor of electricity meter is determined when approaching the metering device of an external permanent magnet with a high value of maximum specific energy in order to consume electric power negligently.

Influence of permanent magnetic fields on creep and microhardness of iron-containing aluminum alloy

The necessity and urgency of studying plastic strain of metals is determined by both scientific significances of the problem and requirements of practice. So the objective of this work is investigation of aluminum alloy creep under action of static magnetic fields. This subject matter is of practical importance for engineering since the parts of engineering constructions are subject to various loads which may lead to their damage or even creep rupture. Based on the experiments performed by us, it is found that creeping increases under stable magnetic field; the main features appear at the first creep stage. Investigation of these processes will help to predict time dependence of creep strain and its rate as well as durability and plasticity at destruction.

Influence of a Permanent Magnetic Field on the Composition and Content of Sugars in Leaves and Storage Roots of Radish Plants of Major Types of Magnetic Orientation

The influence of a weak permanent magnetic field (PMF) with a strength of 400 A/m on the composition and content of sugars was investigated in radish (Raphanus sativus L.) leaves and storage roots of the two major types of magnetic orientation (TMO): North–South (NS TMO) and West–East (WE TMO). Plants were grown in spring and autumn in a greenhouse of the Institute of Plant Physiology, Russian Academy of Sciences. The weak PMF changed the total sugar content in the leaves and storage roots of radish depending on the belonging of the radish plants to the NS or WE type of magnetic orientation, the growing season, and age of plants and the plant organ. The PMF was an environmentally significant factor, since radish plants of different types of magnetic orientation (NS and WE) had a different reaction to the effect of the field related to the peculiarities of their physiological status.

Performance of Lubricated Sliding Contact in Magnetic Field

Results of experimental studies concerning the influence of permanent magnetic field on wear of lubricated sliding contact operating at short stroke and high frequency are presented. It was found that horizontal magnetic is affecting performance of the contact. The jagged delamination regions produced in the presence of a magnetic field can be regarded as easily undergoing oxidisation because oxygen is readily adsorbed there. Magnetic field is likely to intensify the abrasive action by wear particles and mitigate wear of the plate specimen. It is postulated that all these effects are caused by the influence of magnetic field on the electrical charge of the worn surface created on Si3N4 ball.

Influence of permanent magnetic field on wear performance of dry sliding contacts

Abstract Results of experimental studies concerning the influence of permanent magnetic field on wear of dry sliding contact are presented. It was found that magnetic field of horizontal orientation is causing temporary reduction of material's hardness. It also facilitates and accelerates removal process of wear particles from the contact zone. Formation of bulges, consisting of accumulated and compacted anti-ferromagnetic material produced by oxidation, on both sides of the wear track appears to be also aided by the presence of magnetic field. Orientation of magnetic field relative to the sliding direction appears to be of significance. When it is parallel to the sliding direction then the surface roughness of the wear track and mass losses for the uncoated plate are on increase. Wear process of carbon steel coating seems to be significantly affected by magnetic field, which is manifested by the reduction of mass losses and decrease of wear track surface roughness. Additionally, presence of magnetic field promotes generation of very fine wear particles in case of a carbon steel coating.

Influence of magnetic field on wear in high frequency reciprocating sliding contacts

Results of experimental studies concerning the influence of permanent magnetic field on wear of dry sliding contact operating at short stroke and high frequency are presented. It was found that horizontal magnetic field with different orientations relative to the sliding direction is affecting performance of the contact. The increase in frequency of sliding reduces accumulated mass loss and lowers the surface roughness of the wear track in the presence of magnetic field. Enhanced chemisorptions of oxygen by a ferromagnetic material due to the influence of external magnetic field is postulated.

Effects of magnetic fields on the phosphating process

The influence of permanent magnetic fields (MF) 0.5 Tesla (T) on the morphology and corrosion protection (‘drop’ method) of phosphate coatings on high purity Zn (99.9) surfaces has been studied. Two types (i) of Zn phosphating and (ii) ZnCa phosphating solutions have been investigated. The weights of the phosphate coatings without MF differ, approximately twice (P Zn phosphate ∼ 8 g/m 2, while P ZnCa phosphate ∼ 4 g/m 2. ZnCa phosphate coatings are better defined and compact. The number of crystallites ranges from 3.3 10 −2/cm 2 to 3.3 10 −3/cm 2. The amount of crystallites increases in the case of ZnCa phosphating. Three variants of MF were applied: (i) phosphating in perpendicular MF, (ii) in MF parallel to the surface; (iii) phosphating solutions were pre-treated by MF for 10 min and then phosphating process was carried out. A zinc phosphating process in Zn phosphate solution is less influenced by MF in comparison with ZnCa phosphating solution. In this case, phosphate coating is fine grained and compacts, and the number of crystallites increases. The weight reduction of ZnCa phosphate coating reaches to 25%. Corrosion protection increases several times. The fact that the influence of MF remains when solutions are pre-treated in MF and then phosphating is carried out (‘memory’ effect), facilitates its industrial use.

Influence of permanent magnetic field on the phase transitions in some displacive type ferroelectrics and antiferroelectrics

Influence of permenant magnetic fields H = 4, 6, 8 and 10 kOe on the Curie temperature Tc of ferroelectrics BaTiO3, Pb(Sc1/2Ta1/2)O3, (Pb1/2Ba1/2)Bi2Nb2O9, K2Sr4Nb10O30, Pb5Ge3O11, and antiferroelectrics PbHfO3, Pb(Mg1/2W1/2)O3 has been investigated. Displacement of the Tc in H was discovdered, the ΔTHc (H) dependencies were found to be non-linear. Results obtained confirm the predictions of the vibronic theory of ferroelectricity.

Influence of permanent magnetic field on dielectric properties of transparent ferroelectric PLZT ceramics

Influence of permanent magnetic field on dielectric properties of transparent ferroelectric PLZT ceramics