Artykuły w czasopismach: „Magnetoelectric machines”

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Lokhnin, V. V., N. A. Kolesnik i V. I. Marsov. "Magnetoelectric machines on modern vehicles". Izvestiya MGTU MAMI 9, nr 2-1 (20.01.2015): 133–35. http://dx.doi.org/10.17816/2074-0530-67271.

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SMIRNOV, Alexander Yu. "Design of magnetoelectric machines with annular armature winding". Elektrichestvo 2, nr 2 (2021): 60–65. http://dx.doi.org/10.24160/0013-5380-2021-2-60-65.

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Design strategy of synchronous machines with annular armature winding and rotor placed PMs is discussing, which can provide advantages instead of general ones with drum armature winding in two-pole machine magnetic systems with developed outer diameter. Tie derivations between of stator bore volume, torque and electromagnetic loads via Magnetic constant (Arnold’s), equations for linear load, for PMs magnetic conductivity in dependence from rated parameters of magnetically hard material, for phase’s EMF. Slots filling by areas of rectangular wires and of coil and major insulation are taking into consideration. Numerical testing, executed via torque-angle (static) curves calculation by means of finite-element method, shows that the motors, that designed with appropriated torque multiplicity are satisfying to initial technical requirements, that is confirms methodic validity. During numerical testing tooth harmonics, provided by stator tooth structure, influence was evaluating and was given recommendations for reduction this influence. The results of power and torque characteristics comparison with traditional machine supplied by drum winding represented, which confirms capability of declared advantages receipt.

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Garganeev, А. G., S. V. Leonov i D. F. Fedorov. "Research of Highly Effective Magnetoelectric Disc Type Synchronous Motor". Applied Mechanics and Materials 792 (wrzesień 2015): 143–46. http://dx.doi.org/10.4028/www.scientific.net/amm.792.143.

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The electrical and magnetic materials development, as well as the electrical machines principles of design, prepared the base for the research and new designs of high-performance disk-type electric machines development for use, for example, as a high-performance valve gearless electric drive part.

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TATEVOSYAN, A. A., N. A. KHLYANOV i A. A. MAKAROVA. "STUDY OF THE DISTRIBUTION OF FORCES OF INTERACTION BETWEEN PROTOTYPES OF PERMANENT MAGNETS AND A MAGNETIC REFLECTOR, THEIR IDENTIFICATION BY THE CRITERION OF THE SAME VOLUME MAGNETIZATION". Actual Issues Of Energy 3, nr 1 (2021): 075–79. http://dx.doi.org/10.25206/2686-6935-2021-3-1-75-79.

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The relevance of the research topic is due to the trend towards the use of permanent magnets in the designs of electromechanical converters, which is expressed in the multi-pole design of synchronous magnetoelectric machines operating in generator and motor modes. The paper presents the improvement of the method of identification of permanent magnets given in based on the study of the distribution law of magnetic forces of interaction between prototypes of permanent magnets and a magnetic reflector for compliance with the normal distribution according to Pearson's criterion. The possibility of using the methods and properties of the normal distribution law in solving the problem of identifying permanent magnets with the same volume magnetization and sampling permanent magnets from a pilot batch for the development and creation of magnetoelectric machines for various purposes is shown.

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SMIRNOV, A. Yu. "Experience in designing magnetoelectric machines with annular armature winding". Elektrotekhnika, nr 12 (2021): 13–19. http://dx.doi.org/10.53891/00135860_2021_12_13.

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Smirnov, A. Yu. "Experience in Designing Magnetoelectric Machines with Ring Armature Winding". Russian Electrical Engineering 92, nr 12 (grudzień 2021): 732–37. http://dx.doi.org/10.3103/s1068371221120130.

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Tatevosyan, A. A., i A. V. Bubnov. "Development of general approach to optimal design of high-tech energy-efficient electrical systems based on low-speed synchronous magnetoelectric machines". Omsk Scientific Bulletin, nr 168 (2019): 46–51. http://dx.doi.org/10.25206/1813-8225-2019-168-46-51.

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Safiullin, R. A., i I. F. Yangirov. "CONICAL SPIRAL VIBRATION SENSOR WITH IMPROVED METROLOGICAL CHARACTERISTICS". Electrical and data processing facilities and systems 17, nr 3-4 (2021): 49–62. http://dx.doi.org/10.17122/1999-5458-2021-17-3-4-49-62.

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Relevance Currently, vibration of parts of various machines is widely used to increase the intensity and efficiency of technological processes for extracting raw materials and semi-finished products (granulating, drying, dissolving and leaching, extracting, adsorption gas separation, etc.). In other cases, on the contrary, it is necessary to eliminate the harmful effect of vibration on production processes to slow down the movement of units and mechanisms, to damp vibrations in various ways (controlled shock absorption systems, electromagnetic dampers, vibration protection, etc.). For active control of oscillatory processes occurring in these machines, vibration sensors directly connected to them are used. The main element of various vibration sensors is a sensitive element that converts mechanical movement into an electromagnetic signal, which allows it to be further processed. As sensitive elements of electromechanical transducers of vibration sensors for measuring small vibrations of the surfaces of vibration objects, classical strain gauge, magnetoelectric, magnetostrictive, piezoelectric and frequency-pulse elements are used. The design and creation of new vibration sensors with improved metrological characteristics is an urgent task for electrical engineering and electromechanics. In this work, the basic formulas and graphs of the experimental output data of the metrological characteristics of the new design of the vibration sensor are obtained. Aim of research To investigate the metrological characteristics of a new design of a conical spiral vibration sensor. Research methods To determine the oscillatory processes, the methods of the theory of electrical circuits, magnetic fields, methods of mathematical analysis and the theory of electrical oscillatory processes in (beats, induction, etc.) folded circuits are used. Results A new design of a conical spiral vibration sensor has been developed and its metrological characteristics have been investigated.

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Zubkov, Yuri V., i Vladislav E. Vereshagin. "Designing of traction motor stators core". Vestnik of Samara State Technical University. Technical Sciences Series 30, nr 4 (1.02.2023): 102–14. http://dx.doi.org/10.14498/tech.2022.4.7.

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Electric drive is widely used in automotive practice. Its basis is an electric traction motor (TM), which, compared with an internal combustion engine (ICE), has such advantages as high efficiency, high overload capacity, a wide range of speed control, and the possibility of torque direct transmission to the drive wheels. The main requirements for a traction motor are high efficiency over the entire load range, ease of speed and torque control, high overload capacity, small weight and dimensions, regenerative braking capability, wide speed control range, simplicity and ease of maintenance. The most widely used as traction motors are synchronous electric machines with excitation from permanent magnets (PM). They are characterized by high torque density, efficiency and power consistency over a wide speed range. However, there are a number of problems that hinder the introduction of these electric machines in the traction drive of home cars, one of which is the lack of a methodology for choosing the design of an armature and an inductor at the stage of calculating the main dimensions of an TM with magnetoelectric excitation, taking into account the variety of schemes and methods of winding, PM placement in the inductor. The article deals with the issues of choosing electromagnetic loads for various cooling methods, the size of the non-magnetic gap, an algorithm for electromagnetic calculation based on the maximum torque, containing a number of refining cycles, is proposed. The values of inductances and design factors are determined by numerical simulation of the magnetic field. The features of the design and circuit design of the core and armature winding are considered. Distribution curves of magnetomotive forces of distributed and concentrated windings are obtained, their harmonic analysis is made, recommendations are given on the configuration of the TD armature active zone.

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CHERNOV, A. E., i A. V. AKIMO. "COMPARATIVE ANALYSIS OF THE ENERGY CAPACITY OF THE EXCITATION SYSTEM OF THE TRACTOR GENERATORS". Traktory i sel hozmashiny 84, nr 1 (15.01.2017): 46–53. http://dx.doi.org/10.17816/0321-4443-66274.

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The paper describes the technique of comparing fundamentally different types of transverters rotors, namely generators with electromagnetic excitation and magnetoelectric generators. In all embodiments of the comparative analysis it is necessary to compare power capabilities of electrical machines made with different devices in excitation system (permanent magnets, excitation coils), which in principle cannot be implemented without knowing and comparing the magnetic characteristics of the power generators and inductors. To unify the content and progress of computational studies on determination of electromagnetic parameters of generators with different excitation systems and gaining on this basis visual representations of its advantages and disadvantages it is advisable to represent used in the calculations of generators characteristics of permanent magnets and electromagnets in the form of identical form and content analytic or graphic dependencies. This is about the dependence of the magnetic flows in calculated sections of the element excitation systems (in their neutral section Фэм and Фм from magnetomotive force of excitation system F3M и Фм). Most simply this problem is solved by bringing the magnetic characteristics of the electromagnets to the same form and with the same parameters and concepts as the magnetic characteristics of the permanent magnets. As a result of researches it is established that widely used in automobile and tractor electrical equip-ment permanent magnets-ferrites fabricated by powder metallurgy from a mixture of crushed iron oxide and strontium owing to the relatively low level of magnetic energy and low values of residual induction is unable to provide the same level of magnetic properties of the inductors that have the inductors of the generators with electromagnetic excitation, and therefore, their use in automotive generators should be considered inappropriate.

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Ivliev, Dmytro, Volodymyr Kosenkov, Oleksandr Vynakov, Elvira Savolova i Viktoria Yarmolovych. "Design of a direct current motor with a windingless rotor for electric vehicles". Eastern-European Journal of Enterprise Technologies 4, nr 5(112) (31.08.2021): 41–50. http://dx.doi.org/10.15587/1729-4061.2021.231733.

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Modern electric vehicles typically exploit synchronous motors with magnetoelectric excitation as traction engines. While possessing a series of undeniable advantages, the synchronous motor has one significant drawback ‒ the high cost predetermined by the high price of permanent magnets. In addition, the impossibility to disable a magnetic field in case of engine malfunction can lead to an emergency on the road. Given this, there is a need to design new structures of electrical machines with electromagnetic excitation. The structure of a DC traction motor with electromagnetic excitation involving the rotor or stator segmentation makes it possible to considerably weaken the field of the armature transverse reaction by decreasing magnetic conductivity of the magnetic circuit in the transverse direction. Therefore, such a structure lacks commutating poles and a compensation winding. There are no permanent magnets in the structure, all windings are stationary, an electronic switch is used instead of a collector, and a windingless low-inertia rotor does not require additional measures to remove heat. That all has made it possible to significantly reduce the cost of active materials for the traction engine and improve its reliability. To test the performance of the new design, a full-size model of the engine and a working experimental prototype were fabricated. Applying a synchronous jet engine with magnetization for the BMW i3 electric car as an analog, the engine calculations were performed and its simulation was carried out. The results of the analysis show that the mass of the new engine is 35 % greater than the mass of the analog but the cost of active materials is less than that of the analog by 63 %. The results testify to the possibility of implementing a given structure industrially

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Tatevosyan, A. A., i E. G. Andreeva. "Method of formation of numerical projection-grid algorithm on basis of «three-dimensional regular element» for calculation of 3D-models of magnetic field in cylindrical coordinate system for synchronous magnetoelectric machines as part of high-tech electrotechnical complexes". Omsk Scientific Bulletin, nr 168 (2019): 40–45. http://dx.doi.org/10.25206/1813-8225-2019-168-40-45.

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Tatevosyan, Aleksandr, Andrey Tatevosyan i Valeriya Fokina. "Electromagnetic Induced Force Study in the Magnetoelectric Generator Winding". Applied Mechanics and Materials 792 (wrzesień 2015): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amm.792.3.

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The paper considers the study of the electromagnetic force (EMF) of a synchronous generator based on the three-phase induction machine. The stand includes: a frequency converter, an induction motor, a synchronous generator, a three-phase rectifier, an active load resistance, power protection and inclusion industrial electrical network. The study provides an analytical solution to one of the main objectives within theoretical foundations of electrical engineering, formulated so to reflect the decision making while designing new types of synchronous generators with permanent magnets.

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AFANASYEV, Alexander A., Valery S. Genin, Vladimir A. VATKIN, Vyacheslav V. EFIMOV, Artem I. MALININ i Dmitry A. TOKMAKOV. "Analytical and Numerical Simulation of Magnetoelectric Valve Motors". Elektrichestvo 6, nr 6 (2021): 72–78. http://dx.doi.org/10.24160/0013-5380-2021-6-72-78.

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An analytical method for calculating the magnetic field of a magnetoelectric valve motor is proposed, based on the tearing of its active region into a set of geometrically homogeneous bands, at the boundaries of which the conditions for the conjugation of their magnetic fields are met: scalar magnetic potentials and normal components of magnetic induction do not undergo a jump (break). If the magnetic sheets of the windings, for calculation convenience, are located at the boundaries of the specified bands, then the magnetic potentials at the boundaries will have a jump by the value of the total current of the magnetic sheet. To increase the accuracy of the calculation, you should increase the number of bands (sampling) of the active region. When using the computational technology of Fourier variables separation, the conjugation conditions will be reduced to solving a system of linear equations to find the corresponding Fourier constants. As sources of the magnetic field of the motor, in addition to permanent magnets and stator winding currents, the magnetization of the ferromagnetic sections of its magnetic circuit is proposed. The results of magnetic field calculation by this analytical method are compared with the data of the numerical simulation of the considered machine based on the mathematical program ELCUT 6.3.

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Pereira, Nélson, Ana Catarina Lima, Vitor Correia, Nikola Peřinka, Senentxu Lanceros-Mendez i Pedro Martins. "Magnetic Proximity Sensor Based on Magnetoelectric Composites and Printed Coils". Materials 13, nr 7 (7.04.2020): 1729. http://dx.doi.org/10.3390/ma13071729.

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Magnetic sensors are mandatory in a broad range of applications nowadays, being the increasing interest on such sensors mainly driven by the growing demand of materials required by Industry 4.0 and the Internet of Things concept. Optimized power consumption, reliability, flexibility, versatility, lightweight and low-temperature fabrication are some of the technological requirements in which the scientific community is focusing efforts. Aiming to positively respond to those challenges, this work reports magnetic proximity sensors based on magnetoelectric (ME) polyvinylidene fluoride (PVDF)/Metglas composites and an excitation-printed coil. The proposed magnetic proximity sensor shows a maximum resonant ME coefficient (α) of 50.2 Vcm−1 Oe−1, an AC linear response (R2 = 0.997) and a maximum voltage output of 362 mV, which suggests suitability for proximity-sensing applications in the areas of aerospace, automotive, positioning, machine safety, recreation and advertising panels, among others.

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Kotin, D. A., i I. А. Ivanov. "Using of a single-phase synchronous multi-winding generator with permanent magnets for the power supply of an autonomous consumer". Power engineering: research, equipment, technology 24, nr 1 (24.05.2022): 29–38. http://dx.doi.org/10.30724/1998-9903-2022-24-1-29-38.

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THE PURPOSE. Consider the existing ways of using electromechanical converters for power supply of an autonomous consumer. Conduct a comparative analysis of electromechanical converters, scenarios and conditions for their use in the power supply of an autonomous consumer. To develop a proposal to eliminate the shortcomings in existing models of synchronous generators in order to increase their controllability. To develop a mathematical description of a synchronous generator with magnetoelectric excitation from permanent magnets of a single-phase type with a simplified design as a universal example of the functioning of the entire proposed line of synchronous generators. Carry out mathematical modeling of the generator proposed for consideration in order to confirm the proposed method of regulating the generated parameters, such as current and voltage, without the need to change the generator shaft rotation speed.METHODS. When solving the problem, the method of describing an electric machine in a dq-coordinate system using a multi-winding description of the machine was used; to confirm the proposed control method, mathematical modeling with the SimInTech environment was used.RESULTS. The article describes the relevance of the topic, considers the features of the operation of various electromechanical converters for power supply of an autonomous consumer, indicates the conditions for the use of one type or another of the architects of the power supply system in conjunction with electromechanical converters. A line of synchronous generators with magnetoelectric excitation is proposed in order to improve their controllability, namely, the ability to regulate the output generated parameters.CONCLUSION. Using of the proposed synchronous generators with excitation from permanent magnets will allow for additional regulation of the generated parameters, thereby allowing either completely or partially to exclude additional semiconductor converting equipment, thereby reducing losses during the conversion of electrical energy. Moreover, it is possible to regulate the generated current and voltage discretely by two times increasing one of these values, this method of regulation depends on the design of the generator.

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Daneev, A. V., R. A. Daneev i V. N. Sizykh. "IMPLEMENTATION OF A RATIONAL METHOD OF NUMERICAL ANALYSIS TRANSITIONAL PROCESSES IN A VALVE MAGNETOELECTRIC GENERATOR WITH SIX-PHASE ZERO RECTIFICATION CIRCUIT". Izvestiya of Samara Scientific Center of the Russian Academy of Sciences 24, nr 1 (2022): 67–78. http://dx.doi.org/10.37313/1990-5378-2022-24-1-67-78.

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The article poses and solves the problem of developing a universal simulation model of a six-phase magnetoelectric generator (MEG) with a half-wave rectifier based on the mathematical modeling technique, taking into account the rational form of representation of the valve generator (VG) equations and the optimal, in terms of machine time, organization computational procedures. The mathematical description of the gate MEG is based on the method of representing the model equations in a homogeneous coordinate basis of variables, which makes it possible to describe the electromagnetic processes of the SH by a system of differential equations (DE) of the minimum order (in terms of the number of independent circuit circuits - chords of a tree of a directed graph) order. This method is preferred due to the fact that the power structure of the investigated VG does not contain capacitive elements.

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Zhu, Weihao, Chen Yang, Bin Huang, Yan Guo, Longtao Xie, Yangyang Zhang i Ji Wang. "Predicting and optimizing coupling effect in magnetoelectric multi-phase composites based on machine learning algorithm". Composite Structures 271 (wrzesień 2021): 114175. http://dx.doi.org/10.1016/j.compstruct.2021.114175.

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Golubev, A. N., i A. V. Aleynikov. "Control algorithm to improve the vibronoise characteristics of synchronous multi-phase magnetoelectric electric drive". Vestnik IGEU, nr 6 (28.12.2021): 38–44. http://dx.doi.org/10.17588/2072-2672.2021.6.038-044.

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Vibrations and noises occur during the operation of synchronous motors. To reduce them, more advanced engine designs and special control algorithms are used. The application of a multiphase (m > 3) synchronous motor design allows you to influence the configuration of the magnetic field in a wider range. Thus, the task to develop a control algorithm that improves the vibration-noise characteristics of a multiphase motor is relevant. The finite element method is used to calculate the magnetic field in a 2D formulation, implemented in the Elcut software package. Also, the simulation methods with the MatLab Simulink package are applied. The authors suggest the algorithm to control multiphase synchronous motors with permanent magnets that reduces the level of vibrations. Improvement of vibration-noise characteristics is achieved when the motor is supplied with currents of the certain form, and they compensate the pulsation of electromagnetic forces that occur between various parts of the electric machine. This algorithm is based on the measurement of the electromagnetic forces and the torque directly in the process of control. The results of modeling the operation of the engine with the developed control algorithm are presented. The authors have compared the characteristics obtained using the developed control algorithm and the characteristics that correspond to the sinusoidal source supply. The vibration-noise characteristics of a permanent magnet synchronous motor can be improved by using the control system. This control system generates currents in an appropriately synthesized form. In this case, the power consumption will increase slightly.

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Chumack, Vadim, Volodymyr Bazenov, Oksana Tymoshchuk, Mykhailo Kovalenko, Serhii Tsyvinskyi, Iryna Kovalenko i Ihor Tkachuk. "Voltage stabilization of a controlled autonomous magnetoelectric generator with a magnetic shunt and permanent magnet excitation". Eastern-European Journal of Enterprise Technologies 6, nr 5 (114) (21.12.2021): 56–62. http://dx.doi.org/10.15587/1729-4061.2021.246601.

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The paper presents the results of testing and research of the characteristics of a controlled autonomous magnetoelectric synchronous generator with a magnetic shunt. Structurally, the studied generator is a modified asynchronous machine in which the rotor is made with permanent magnets and an additional system in the form of a magnetic shunt. By adjusting the winding current of the magnetic shunt, the output voltage of the generator is regulated. The following characteristics were investigated: the no-load characteristic during operation with permanent magnets and when the winding current of the magnetic shunt changes with forward and reverse polarity. Also, the external characteristic for active and active-inductive loads; the control characteristic when the load current changes at a constant generator voltage. Analysis of the obtained characteristics makes it possible to determine the limits of regulation of the external characteristic, which is ≈40 % relative to the main magnetic flux. The obtained regulation depth allows maintaining the stability of the external characteristic for power factors not exceeding 0.9, which is the usual passport value for autonomous power plants based on synchronous generators. Comparison of the data of research conducted on the experimental setup shows sufficient convergence for engineering and practical tasks. The maximum quantitative difference is 9.3 %, which suggests the adequacy of the previously developed mathematical model. The control characteristic, constructed experimentally at constant generator voltage, is the control law of the magnetic shunt winding for the studied generator. The investigated version of a synchronous generator with a magnetic shunt should be used for autonomous power plants, renewable energy systems, and autonomous power supply systems.

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Vysotsky, V. E. "Brushless direct current motors with permanent magnets for marine electric drive systems: state and prospects". Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 15, nr 3 (30.07.2023): 476–89. http://dx.doi.org/10.21821/2309-5180-2023-15-3-476-489.

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The main trends in the development of designs, power semiconductor circuits and control systems of promising valve electromechanical converters — brushless DC motors with permanent magnets for marine electric drive and automation equipment, are discussed in the paper. A variant of their implementation in an adjustable electric drive is presented. The object of the study is a brushless direct current electromechanical system, including a synchronous machine with magnetoelectric excitation, covered by positional feedback through a dependent controlled valve switch, and the subject is structures, the circuit of the power part, control systems, the algorithm of functioning and characteristics. The purpose of the research is to evaluate the operational features, properties and possibilities of introducing brushless direct current motors with permanent magnets as marine electric drive systems of low and medium power. The results of research and development are embodied in experimental industrial samples. A variant with microprocessor control has been developed for marine electric drive systems. The switch is assembled on transistor switches that provide high reliability and enhance the functionality of the control system. The minimum necessary system of logical variables, ensuring the implementation of rational laws of switching and speed control, has been formed. Operational characteristics at various leading angles of switching on the switch valves are presented. The presence of pole shoes at the poles introduces significant features in the patterns of their change. The main advantages and features of the proposed design and circuit solutions are formulated in the conclusions. It is indicated that valve motors with excitation from permanent magnets are the most promising solution in terms of integrating an electromechanical converter into an adjustable marine electric drive of a range of small and medium capacities.Engines of this type are structurally simple and reliable, have rigid natural mechanical characteristics, do not require energy for excitation, have a large overload capacity and high speed in transients. Their distinctive feature is the high specific moment.

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Panteleev, S. V., A. N. Malashin i A. E. Kaleda. "Simulation of m-phase active voltage rectifier with space-vector modulation". Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 63, nr 4 (12.01.2019): 455–68. http://dx.doi.org/10.29235/1561-8358-2018-63-4-455-468.

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The autonomous power supply system (APSS) from synchronous magnetoelectric generator and active voltage rectifier (AVR) maximally meets the requirements of the minimum specific mass and the complete coordination of the primary electric power source with the load. With multiphase (m > 3) execution of the electric machine, it is possible to obtain a trapezoidal electromotive force (EMF) and increase the specific power conversion provided that the EMF and the current at the output of the m-phase generator are fully matched. Therefore, the aim of the work is to synthesize the space-vector modulation (SVM) algorithm of the active voltage rectifier to fully match the primary source of electrical energy with the load under the condition of a trapezoidal EMF of the generator. Synthesis of the PVM algorithm for the m-phase AVR is based on the use of a vector-matrix mathematical apparatus. Using the example of a nine-phase system, a SVM algorithm has been developed, the feature of which is the transformation of the generalized voltage vector m-phase coordinate system into (m – 1)/2 voltage vectors with different angular velocities in two-phase orthogonal stationary αβ coordinate systems. At the same time, based on the developed PVM algorithm, it is possible to independently control the (m – 1)/2 voltage vectors in the corresponding αβ planes, providing a signal similar to the EMF of the generator at the input terminals of the AVR. In order to confirm the theoretical propositions, an imitation model of the space-vector modulation unit for the realization of trapezoidal signals at the terminals of a nine-phase AVR has been developed. The efficiency of the developed algorithm is confirmed by the results of simulation modelling. As a result of the evaluation of the energy parameters (operating power) of the phase of power supply system direct current, it is established that the application of the developed space-vector modulation algorithm for the active voltage rectifier in order to fully match the trapezoidal shape of the EMF and the current at the output of the m-phase generator will increase the power of the APSS by 14 % compared to a power supply system of direct current with a sinusoidal form of the EMF and the current of the generator phase. It is established that the developed measuring device can be used to establish the presence of defects like “delamination”. The influence of the depth of the defect placement on the measured parameters is shown.

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"Magnetic Systems of Contactless Regulated Synchronous Generators with Basic Magnetoelectric Excitation". Bulletin of the South Ural State University series "Power Engineering" 20, nr 3 (październik 2020): 119–31. http://dx.doi.org/10.14529/power200312.

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The article is devoted to the search and research of ways to optimize magnetic systems of contactless synchronous generators with a capacity of 30–50 kVA used in Autonomous power supply systems for ground-based mobile objects. The main atten-tion is paid to electric generators with a combined excitation system, the air gap magnetic flux of which is created by the combined action of permanent magnets of the main inductor and an electromagnetic adjustment link necessary to maintain the constancy of the output voltage when the rotor speed and generator load change. Ac-cording to the authors, with an increase in the power of the source over 30–35 kVA, DC machines will be replaced by generators of this type. The article also describes a machine with a fundamentally new magnetic system, which contains elements of the design of electric machines with radial and axial flux. The proposed magnetic system, according to the authors, allows us to fully utilize the potential inherent in machines of both forms, improve the specific characteristics and, most importantly, maintain the highest technical reliability inherent in contactless Electrical Machines.

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Hu, Yong, Scott Broderick, Zipeng Guo, Alpha T. N’Diaye, Jaspal S. Bola, Hans Malissa, Cheng Li i in. "Proton switching molecular magnetoelectricity". Nature Communications 12, nr 1 (29.07.2021). http://dx.doi.org/10.1038/s41467-021-24941-9.

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AbstractThe convergence of proton conduction and multiferroics is generating a compelling opportunity to achieve strong magnetoelectric coupling and magneto-ionics, offering a versatile platform to realize molecular magnetoelectrics. Here we describe machine learning coupled with additive manufacturing to accelerate the design strategy for hydrogen-bonded multiferroic macromolecules accompanied by strong proton dependence of magnetic properties. The proton switching magnetoelectricity occurs in three-dimensional molecular heterogeneous solids. It consists of a molecular magnet network as proton reservoir to modulate ferroelectric polarization, while molecular ferroelectrics charging proton transfer to reversibly manipulate magnetism. The magnetoelectric coupling induces a reversible 29% magnetization control at ferroelectric phase transition with a broad thermal hysteresis width of 160 K (192 K to 352 K), while a room-temperature reversible magnetic modulation is realized at a low electric field stimulus of 1 kV cm−1. The findings of electrostatic proton transfer provide a pathway of proton mediated magnetization control in hierarchical molecular multiferroics.

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Zhou, Ying-Xin, Jia-Sheng Zu i Jing Liu. "Insights into fluidic endogenous magnetism and magnetic monopoles from a liquid metal droplet machine". Soft Science, 2021. http://dx.doi.org/10.20517/ss.2021.16.

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Magnetism and magnetic monopoles are among the most classical issues in physics. Conventional magnets are generally composed of rigid materials and may face challenges in extreme situations. Here, as an alternative to rigid magnets, we propose, for the first time, the generation of fluidic endogenous magnetism and construct a magnetic monopole through tuning with a liquid metal machine. Based on theoretical interpretation and conceptual experimental observations, we illustrate that when liquid metals, such as gallium alloy, in a solution rotate under electrical actuation, they form an endogenous magnetic field inside. This explains the phenomenon where two such discrete metal droplets can easily fuse together, indicating their reciprocal attraction via the N and S poles. Furthermore, we reveal that a self-fueled liquid metal motor also runs as an endogenous fluidic magnet owing to the electromagnetic homology. When aluminum is added to liquid gallium in solution, it forms a spin motor and dynamically variable charge distribution that produces endogenous magnetism inside. This explains the common phenomena where reflective collision and attractive fusion between running liquid metal motors occur, which are partially caused by the dynamic adjustment of their N and S polarities, respectively. On this basis, more experimental approaches capable of generating dynamic electrical fields also work for the same target. Finally, we propose that such a fluidic endogenous magnet could lead to a magnetic monopole and four technical routes to realize this are suggested. The first involves matching the interior flow of liquid metal machines. The second is the superposition between an external electric effect and the magnetic field. The third route involves composite construction between magnetic particles and a liquid metal spin motor. Finally, chemical methods, such as via galvanic cell reactions, are proposed. Overall, the present theory and identified experimental evidence illustrate the role of a liquid metal machine as a fluidic endogenous magnet and highlight promising methods for the realization of magnetic monopoles. A group of unconventional magnetoelectric devices and applications could therefore be possible in the near future.

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"Magnetoelectric machine". American Journal of Gastroenterology 96, nr 2 (luty 2001): 584. http://dx.doi.org/10.1111/j.1572-0241.2001.03560.x.

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"Magnetoelectric machine". American Journal of Gastroenterology 96, nr 2 (luty 2001): 584. http://dx.doi.org/10.1016/s0002-9270(00)02353-4.

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Kuczynski, Karol, Maciej Lisicki, Piotr Bilski, Jerzy Szymanski i Adrian Bilski. "Magnetoelectric ring sensor—modelling and experimentation". Microsystem Technologies, 16.06.2023. http://dx.doi.org/10.1007/s00542-023-05472-3.

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AbstractThe paper presents the theoretical model and implementation of the magnetoelectric ring sensor. The designed device is capable of measuring the constant magnetic field of low amplitudes (even several dozen nT). To determine its capabilities and resolution, the hysteresis characteristics were evaluated and measured. Besides the theoretical description of the sensor, two heuristic approaches were used to approximate the internal characteristics (including the hysteresis loop), solving the regression task: a multilayered perceptron and support vector machine. Experiments show that the former has minimally Mean Square Error, which suggests its better applicability for heuristic modeling of the real-world device.

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ARORA, DIKSHA, Pradeep Kumar, KUMAR KAUSHALENDRA i Davinder Kaur. "Unravelling the magnetodielectric characteristics of strain-coupled PMN-PT/FSMA multiferroic heterojunction toward flexible MEMS applications". Journal of Physics D: Applied Physics, 25.07.2022. http://dx.doi.org/10.1088/1361-6463/ac83d0.

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Abstract Flexible microelectromechanical (MEMS) devices are poised to scaffold technological innovations in the fields of wearable sensors, implantable health monitoring systems and touchless human-machine interaction. Here, we report the magnetoelectric properties of cost-effective and room-temperature sensitive 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3/Ni50Mn35In15 (PMN-PT/FSMA) multiferroic heterostructure integrated on flexible stainless steel substrate via RF/DC magnetron sputtering technique. The growth of the pure perovskite phase of PMN-PT without any pyrochlore impurity is confirmed by the dominant (002) orientation of the tetragonal PMN-PT. The double logarithmic plot of current density with electric field validates an Ohmic conduction mechanism with low leakage current density of ~10-6 A/cm2. The anomaly observed in temperature-dependent dielectric and ferroelectric characteristics of the heterostructure overlap with the martensite transformation regime of the bottom Ni-Mn-In (FSMA) layer. The PMN-PT/Ni-Mn-In multiferroic heterostructure exhibits a significant magnetodielectric effect of ~3% at 500 Oe and can be used as an ultra-sensitive room-temperature magnetic field sensor. These results have been explained by an analytical model based on strain-mediated magnetoelectric coupling between interfacially coupled PMN-PT and Ni-Mn-In layers of the multiferroic heterostructure. Furthermore, the excellent retention of magnetodielectric response up to 200 bending cycles enhances its applicability towards flexible MEMS devices. Such PMN-PT based multiferroic heterostructures grown over the flexible substrate can be a potential candidate for piezo MEMS applications.

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Mahesh, Vinyas, Vishwas Mahesh, Sathiskumar A. Ponnusami i Dineshkumar Harursampath. "Machine learning assisted coupled frequency analysis of skewed multi-phase magnetoelectric composite plates with temperature and moisture dependent properties". Mechanics of Advanced Materials and Structures, 9.08.2023, 1–16. http://dx.doi.org/10.1080/15376494.2023.2242858.

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