Rotor Of Asynchronous Motor Research Articles

Creating a computer model of a synchronous motor for the implementation of the project «Creation of a series of electric motors with a modernized rotor for electric transport of low power»

RELEVANCE. The challenges of creating modern permanent magnet synchronous motors require solving technical problems in conjunction with economic realities. Due to the use of permanent magnets in the construction of synchronous motors, their cost limits their industrial application. Therefore, there is an urgent issue of optimizing the design of synchronous motors, which can be solved by changing the topology.TARGET. The goal is to create more economical permanent magnet synchronous motors (PMSMs) in low-power electric vehicles. It is planned to implement a new method for constructing PMSM. This solution will reduce weight and size parameters and increase specific power, which are important indicators for electric transport.METHODS. To modernize modern synchronous motors, a complex topological optimization method based on a genetic algorithm is proposed.RESULTS. A computer model was obtained in the form of calculation of electromagnetic fields in the stator and rotor of a synchronous motor with permanent magnets.CONCLUSION. Modeling the parameters of synchronous motors with permanent magnets has a low degree of development in the domestic mechanical engineering due to the lack of developed infrastructure in the field of low-power electric transport; the creation of domestic developments in this area is of a strategic nature.

State feedback method of inter-turn short circuit in rotor winding of induction motor based on improved association rule algorithm

Aiming at timely feedback and processing of asynchronous motor rotor windings, a feedback method based on an improved association rule algorithm of asynchronous motor rotor windings is studied. Based on the inter-turn short circuit mechanism of asynchronous motor windings, the fuzzy association rule mining method is used to mine the inter-turn short circuit mechanism of asynchronous motor windings. The method mines the rotor-side electrical parameters as the input of the deep neural network and uses the deep neural network to output the short-circuit state feedback results of the rotor windings of the asynchronous motor. The experimental results show that when the A-phase of the asynchronous motor is the faulty phase, the A-phase current of the rotor winding inter-turn short circuit increases significantly, and the phase angle difference deviation has a positive correlation, which effectively feedbacks the asynchronous motor rotor winding inter-turn short-circuit state.

Optimizing geometric parameters for the rotor of a traction synchronous reluctance motor assisted by partitioned permanent magnets

This paper considers partitioning parameters and the mutual arrangement of magnets in the rotor of the traction synchronous-jet engine with permanent partitioned magnets. The synthesis of geometrical parameters for the rotor of a synchronous reluctance motor with partitioned permanent magnets was proposed on the basis of solving the problem of conditional optimization. To solve the synthesis problem, a mathematical model has been built to determine the electromagnetic momentum of a synchronous reluctance motor with partitioned permanent magnets. It is based on the calculation of the electromagnetic momentum of the engine employing the results of a finite-element analysis of the magnetic field in the flat-parallel statement of the problem. The model is implemented in the finite-element analysis FEMM environment and makes it possible to determine the electromagnetic momentum of the engine with a variety of partitioning of permanent magnets. As an analysis problem, it is proposed to use a mathematical model of the magnetic field of the engine. The problem of conditional optimization of the rotor of a synchronous reluctance motor was stated according to the geometric criteria of the rotor. Restrictions are set on geometric, strength indicators, as well as on the level of electromagnetic momentum. The chosen optimization method is the Nelder-Mead method. Based on the results of solving the problem of synthesizing parameters for the partitioned rotor of the traction motor of trolleybus wheels, it was established that the volume of permanent magnets was reduced by 2.27 times compared to the base structure; their optimal geometric dimensions were determined (5 mm, 5.2 mm, and 5 mm), as well as the distance between them, 17.8 mm and 15.3 mm, and the engine load angle, which is 121.12 electrical degrees. Based on the results of solving the problem of synthesizing parameters for the partitioned rotor of a trolleybus traction synchronous reluctance motor, its optimal geometric parameters have been determined

ESTIMATION OF EDDY CURRENTS AND POWER LOSSES IN THE ROTOR OF A SCREW ELECTROTHERMOMECHANICAL CONVERTER FOR ADDITIVE MANUFACTURING

3D printing technologies for large-scale structures allow architects and builders to considerably expand the design boundaries of structures and increase the efficiency of their construction. Mobile robotic platforms for 3D printing are increasingly being implemented in the construction sector, as well as in the production of road surfaces, allowing to solve the problem of limited working space. The typical design of the extruder assembly of a robotic platform for 3D printing large-scale structures can be improved by combining an electric motor, an auger extruder, and a heater in one housing. The proposed auger-type electrothermomechanical converter uses an external auger rotor, which simultaneously performs the functions of an asynchronous motor rotor, a heating element, an actuator, and a protective housing. The purpose of this study was to evaluate the efficiency of using an auger converter as part of a mobile robotic platform for additive manufacturing. For converters operating in difficult conditions, the use of field calculation methods is relevant. In this study, a field calculation was performed using the finite element method and the spatial distribution of eddy currents in the section of the hollow ferromagnetic rotor was found. Pictures of the three-dimensional distribution of the z-component, the normal component of the density of eddy currents, as well as the distribution of the dissipated power density, which considers all types of losses in the rotor, were obtained using the Comsol Multiphysics software and computing complex. The practical value of the obtained results lies in the possibility of predicting optimal indicators of the influence of the thermal regime on the material, as well as the speed of rotation of the converter rotor. This will determine the mechanical properties of the material at the output of the device.

Design optimization of vehicle asynchronous motors based on fractional harmonic response analysis

Abstract. To make vehicles more reliable and efficient, many researchers have tried to improve the rotor performance. Although certain achievements have been made, the previous finite element model did not reflect the historical process of the motor rotor well, and the rigidity and mass in rotor optimization are less discussed together. This paper firstly introduces fractional order into a finite element model to conduct the harmonic response analysis. Then, we propose an optimal design framework of a rotor. In the framework, objective functions of rigidity and mass are defined, and the relationship between high rigidity and the first-order frequency is discussed. In order to find the optimal values, an accelerated optimization method based on response surface (ARSO) is proposed to find the suitable design parameters of rigidity and mass. Because the higher rigidity can be transformed into the first-order natural frequency by objective function, this paper analyzes the first-order frequency and mass of a motor rotor in the experiment. The results proved that not only is the fractional model effective, but also the ARSO can optimize the rotor structure. The first-order natural frequency of asynchronous motor rotor is increased by 11.2 %, and the mass is reduced by 13.8 %, which can realize high stiffness and light mass of asynchronous motor rotors.

Topological optimization of the rotors of permanent magnet synchronous motors

Permanent magnet synchronous motors are increasingly used in the oil industry. These motors need to be made more energy efficient. To do this, it is necessary to optimize the rotor of a synchronous motor by changing the design through topological optimization. Designing an electrical machine as a heuristic process does not guarantee finding the best solution. Methods are needed that complement the experience and intuition of the designer to find the optimal (rational) solution. Topological optimization is currently performed using the finite element method to reduce mass and improve the stiffness of structures. The proposed method allows you to transfer topological optimization to electromagnetic processes in permanent magnet synchronous motors to determine the direction of magnetization and the size of permanent magnets, for a given mass-dimensional parameters. Optimization of the rotor of a serial permanent magnet motor based on a genetic algorithm is proposed. A new topology of the rotor of the motor was calculated and an increase in the torque was obtained by 18.2%, which indicates that topological optimization is promising for synchronous motors with permanent magnets.

Study of compensation of reactive power of short-circuited rotor of asynchronous motor

This paper provides an overview of the current state of reactive power compensation technologies. Principles of operation, design characteristics are presented. One of the basic questions connected with improvement of quality of the electric power in branches which will be solved both at a design stage and at the stages of functioning of industrial systems of electrical supply is the compensation of jet capacity, including a choice of corresponding sources, calculation and regulation of their capacity, placing of sources in the power supply system. Rational coverage of reactive power in industrial electrical networks involves many problems aimed at increasing the efficiency of electrical installations.

Synthesis of the rotor frequency of the asynchronous motor rotor, based on the concept NN

Synthesis of the rotor frequency of the asynchronous motor rotor, based on the concept NN

Sensorless vector control of a permanent magnet synchronous motor

The most common control system for a synchronous motor with permanent magnets is a vector control system. The construction of such a system has a number of difficulties, one of them is the need to have information about the current position of the rotor. Data on the position of the rotor can be obtained using sensors, or include a supervisor in the control system. The article describes an adaptive observer of the position and speed of the rotor of a synchronous motor with permanent magnets. This observer is used in the system of sensorless vector control of the electric drive. The presented version of the observer of the engine state is realized by creating a model in the Matlab Simulink software package. The results of experimental verification of the presented observer at the stand with the use of an engine with a power of 200 W are shown. The aim of the work is to develop an observer that is stable to changing drive parameters. This is achieved by using a relay unit in the view of the observer, which implements the slip mode.

Application of Teaching-Learning-Based Optimization Algorithm in Rotor Fault Diagnosis for Asynchronous Motor

To improve the accuracy of rotor fault diagnosis of an asynchronous motor, a method of teaching-learning- based optimization combined with BP neural network (TLBO-BP) is proposed. For the sake of further enhancing the optimization capability of teaching- learning-based optimization (TLBO) algorithm, the elite learning strategy is applied to perform the information feedback between teachers and students once again. Subsequently, according to the feature vectors of rotor fault, TLBO algorithm is adopted to search for the initial weights and thresholds of BP neural network, and then the fault diagnosis model of the asynchronous motor rotor is built. The experimental results indicate that the TLBO-BP approach has higher diagnostic accuracy, and can effectively identify the rotor fault modes of an asynchronous motor.

On the Design and Construction Assessments of a Permanent-Magnet-Assisted Synchronous Reluctance Motor

By appropriately inserting ferrite magnets into the rotor of a synchronous reluctance motor (SynRM), the machine operational power factors and torque outputs can be improved. With specific rotor structures to accommodate those ferrites, many of these permanent-magnet-assisted SynRMs (PMA-SynRMs) have been proposed to comply the expected operational objectives. For construction convenience, the ferrites that being inserted into the flux barriers of these PMA-SynRMs are generally in rectangular shapes; hence, some adjustments on the rotor flux barriers and additional bridges are required. Such changes will inevitably affect the performance of the original SynRMs with optimized rotor structures, and these tradeoffs are thus to be recovered by parts of those adopted ferrites. This paper will provide an evaluation index that can characterize the performance of PMA-SynRMs with different volume compositions of the ferrites, along with the impact assessments of the SynRMs with modified flux barriers such that those ferrites can be properly allocated. Based on the designs obtained from thorough 3-D finite-element analyses, a 3-hp PMA-SynRM will be constructed and the related experimental measurements will also be supported to validate the design adequacies.

Управляемая вибрация звеньев подвижности производственного механизма

Introduction. The work subject is investigating friction characteristics of the moving surfaces of the production mechanism (PM) links including executive mechanisms (EM), and work tools (WT) of technological machines (TM) in the low-speed zone of an asynchronous motor (AM) powered from an autonomous voltage inverter (AVI) in the “AVI - AM” system. The work objective is to find a technical solution to the reduction of the friction effect in the PM links on the frequency-controlled drive (FCD) mechanical characteristics in the low- and creep-speed zone, and also, to the validation of the rated vibration feasibility of the mobile links in the PM guides under the starting-braking AM modes. Materials and Methods. To solve the research problems, the concept of bimodal AVI control that provides the formation of quasi-sinusoidal voltage for AM power supply in the “AVI - AM” system with the harmonic coefficients K u u > 8% is used. The program control of the amplitudes of the fundamental 5th and 7th harmonics of the stator current is applied. These harmonics form the fluctuating torques on the AM shaft and cause the normalized vibration of the PM links. Research Results. The justification and experimental proof of the AVI control feasibility providing a project change in the AM shaft vibration amplitude and a decrease in the effective friction coefficient of the PM moving links aiming at the elimination of the seizure of the links under the PM operation conditions are obtained. Such an effect is possible under the AM rotor spinning in the low current frequency (0.5-20 Hz) zone which is typical for the slow-speed motion of PM under the starting-braking FCD modes. Discussion and Conclusions. The application domain of the developed technical solution covers many PMs with FCD for which the short-time operation modes (with CY of 40% and more) are considered basic. Thus, the use of the effect of vibration linearization of the friction coefficient in the PM links allows the following: to reduce the AM breakaway voltage and significantly extend the FCD speed control range, to increase the ride quality and improve the PM out put link kinematics on which the WT is fixed.

Система высокочастотной инжекции в бездатчиковой модели определения углового положения ротора синхронного двигателя

The article deals with sensorless method for determining the angular position of the rotor of a synchronous motor by means of superimposing a high-frequency signal. The essence of the method is that a high frequency signal excites the voltage or current, which contain information-rotor position. S ignal processing techniques can estimate the rotor position by using appropriate methods. The pros and cons of the use of such systems to replace systems using rotor position sensor are presented. Among the advantages of the use of sensorless systems, noted the following: improving the reliability of the electric system, reducing the cost of the drive, improving the weight and dimensions. The area of the application of the species of the drive is showed. Circuit laboratory stand for experimental are powered-on. A derivation of the formula for the calculation of the angular decomposition in the rotor of a synchronous motor. Data obtained during the experiment for determining the angular position sensorless is analyzed. Findings allow us to conclude to reduce the cost and size of the system for determining the angular position and increase its reliability are presented.

Synchronous motor with hybrid permanent magnets on the rotor.

Powder metallurgy allows designers of electric motors to implement new magnetic circuit structures. A relatively new concept is the use of a magnet system consisting of various types of magnets on one rotor, for example sintered and bonded magnets. This concept has been applied to the design and manufacture of the four-pole rotor of a synchronous motor with 400 W power and a rotational speed of 1500 rpm. In this motor, the stator of an asynchronous motor type Sh 71-4B is applied. The application of the new construction of the rotor resulted in an increase in motor efficiency and power factor compared to an asynchronous motor with the same volume.

Определение углового положения ротора cинхронного двигателя в режиме векторно-импульсного пуска

This article discusses a method for sensorless determining the angular position rotor synchronous motors. It is known that there are difficulties in determining the angular position of the rotor in low speed range. Method using a high-frequency voltage injection, which allows to solve this problem is proposed in this article. The high-voltage signal processing circuit is examined and described in detail. A comparative analysis of the angular position of the rotor of a synchronous motor and the proposed sensorless method using a mechanical encoder is made. The obtained results suggest the possibility of using this method in the various systems of the drive.

Сравнение характеристик асинхронного двигателя с короткозамкнутым ротором при замене материала обмотки ротора и предложения по их улучшению

Have been analyzes the questions of the changes the geometry toothed zone asynchronous motor rotor, that must be done when changing the material of the rotor winding. It is noted that the use of the asynchronous generator with wound cast copper rotor winding instead of cast aluminum winding, is not a problem. But for motors with rotor copper windings should conduct additional studies to ensure acceptable starting characteristics and conservation of energy indicators. It was found that the deepening of rotor slot by 15 % will lead to increased influence of crowding out current and will provide for the asynchronous motor with a copper rotor winding same starting characteristics, which have been the engine with aluminum one. The results were obtained under the condition of conservation cross-sectional area of the groove, i.e. copper consumption and cost.

Research on the Observation Method for Asynchronous Motor Rotor Flux

Accurate acquisition of asynchronous motor rotor flux plays a significant part in the high-performance motor speed regulation system. For that reason, this paper gives the advantages and disadvantages of various methods for motor rotor flux observation based on the studying of them, also application guides are given. Finally, a combination model based on the voltage model of rotor flux observer and the current model of rotor flux observer is given, and simulation analysis based on the combination model is carried out by Matlab/Simulink to verify the effectiveness of it.

Breaks Strip Breakdown with the Parameter Identification Law Diagnosis Mouse Cage Asynchronous Motor Rotor

According to the three-phase squirrel-cage asynchronous motor rotor broken bar fault, presented with parameters identification method of asynchronous motor parameter identification to monitoring and diagnosis of rotor resistance variation of rotor bar breaking principle. Choose a three-phase squirrel-cage asynchronous motor in three working points of experiments, results show that the method is correct and feasible. This method is based on the three-phase squirrel-cage asynchronous motor steady state model parameter equation, using the method of least squares identification parameters, and consider the effects of temperature on the parameters, by the parameter variation in diagnosis of broken rotor bar fault. Advantages of simple scientific method, this method can also be used in conjunction with other methods and, on the three-phase squirrel-cage asynchronous motor rotor has no fault diagnosis.

Magnetic field and core loss evaluation of ALA-motor synchronous reluctance machines taking into account material anisotropy

Currently, much attention is paid to the behavior of thin laminations of anisotropic soft magnetic materials with respect to magnetization out of the easy axis. A method for analyzing flux distribution and loss calculation is proposed for electric machines exhibiting strong material and 'structural' anisotropy. The method takes into account the curvature in anisotropic and composite flux barrier regions by introducing equivalent reluctivities. The results of a case study on an axially laminated anisotropic (ALA) rotor of a synchronous reluctance motor (SynRM) are presented.