Operation Of Synchronous Motor Research Articles

A deep residual neural network model for synchronous motor fault diagnostics

Synchronous motors play a significant role in a wide range of industrial applications. Their reliable operation is paramount. Any faults in synchronous motors can lead to costly downtime, decreased productivity, and potential safety hazards. By accurately diagnosing and classifying faults, we can proactively address issues before they escalate, ensuring the smooth operation of synchronous motors and minimizing the risk of equipment failure. The accurate diagnosis and fault detection in synchronous motors pose a significant challenge in their operation and maintenance. In the existing models, the feature data at various depths are not thoroughly extracted to maximize their feature extraction capability. Additionally, they employ a single support vector machine to make the final decision on the output. The single support vector machine may not consistently produce more accurate outcomes. Therefore, this paper proposes a novel fault diagnosis model based on a deep residual neural network and multiple support vector machines to diagnose mechanical and electrical faults of synchronous motors. The proposed model improves upon existing fault diagnosis models in two key aspects. Firstly, by employing a deep neural network, the model is able to effectively process and extract fault features from the motor fault dataset, capturing more nuanced information that may be missed by existing models. Secondly, the use of multiple support vector machines enhances the decision-making capability of the model, allowing for more accurate fault diagnosis. By combining these two aspects, the proposed model achieves superior diagnostic performance compared to single support vector machine-based models. Our proposed model has been rigorously evaluated using mechanical and electrical fault datasets, and the results of experimental tests clearly demonstrate its superior diagnostic performance when compared to existing fault diagnosis models. The synergy of deep neural networks and multiple support vector machines not only improves fault detection accuracy but also enhances the robustness and generalizability of the model, making it a valuable tool for real-world industrial applications.

IMPROVING THE EFFICIENCY OF 6–10 KV POWER GRIDS OF INDUSTRIAL ENTERPRISES THROUGH OPTIMAL REACTIVE POWER CONTROL

"The article deals with improving the efficiency of an industrial power system, which is determined by the level of power losses in its elements. One of the most important methods of increasing the efficiency of power supply systems and distribution networks that ensure the transmission and distribution of electricity is to reduce the amount of electrical energy that is expended in this process. Reducing power losses in electrical grids is achieved by reducing the reactive component of the electric current, i.e., by increasing the cos φ. The Electrical Installation Code recommends, first of all, using the synchronous motors available at the enterprise. It is reasonable to solve the problem of minimizing active power losses in the power grid using the method of mathematical modeling and mathematical programming. The article presents the main features of the criterion programming method for solving a class of problems with a positive degree of difficulty, which is quite well-known in the electric power industry for solving optimization problems. We propose the method of criterion programming to solve the problem of improving the efficiency of the power grid by optimal control of the operation of synchronous motors according to the reactive power mode. "

Parameter Identification of Permanent Magnet Synchronous Motor Based on Improved MRAS Algorithm

During the operation of a permanent magnet synchronous motor, the electrical parameters of the motor will be affected by the temperature and the saturation of the magnetic chain, which will lead to a decrease in the effectiveness of the control algorithm for motor control. In this paper, we address the problem that the traditional MRAS algorithm has under-ranked equations when identifying motor parameters, and the three parameter identification values are coupled with each other and affect each other, which leads to scattered identification results and slow identification speed. In this paper, we propose a segmentation identification algorithm that combines the traditional MRAS algorithm with the recursive least squares method. In this paper, the inductance value is first identified by the recursive least squares method, and then the inductance value is substituted into the MRAS to identify the stator resistance and rotor magnetic chain, which effectively solves the problems of equation under-ranking and slow identification speed in the traditional MRAS, thus improving the stability of the permanent magnet synchronous motor operation.

Harmonic error observation of permanent magnet synchronous motor and its angle lag compensation method

During the permanent magnet synchronous motor operation, the inherent back-EMF output voltage harmonics of the permanent magnet synchronous motor shows the high harmonic noise signal, which is not conducive to the high precision control system. The harmonic error compensation method based on feedforward compensation is adopted to solve this problem and improve the system response characteristics and control accuracy. Firstly, in this paper, the torque harmonic error of a 12-pole 18-slot permanent magnet synchronous motor is analyzed and compensated. Then, this paper compensates the lag problem, which caused by the lag phase of the space voltage vector and harmonic lag. Finally, the experimental and observational simulation analysis results show that the method proposed in this paper can effectively suppress the error caused by the signal sampling lag. And the observation accuracy of permanent magnet synchronous motor is significantly improved.

Optimal pulse width modulation for permanent magnet synchronous motor drive with improved torque and thermal losses using pulse numbers

This paper utilises the concept of pulse numbers to provide a new optimal pulse width modulation strategy for permanent magnet synchronous motor operation. The benefits of traditional modulation systems are preserved, as is an improvement in torque and thermal loss reduction. The continuous modulation approaches' performance limitations are solved by separating the performance constraints based on the drives surface area. The rotating component, which is regulated through odd and even pulse numbers, is used to mimic torque and thermal losses. With increases to 20 rpm and 30 rpm speeds, the suggested methods boost the 6% to 8% line current. Thermal losses are reduced by 21° C to 23° C, and torque is improved by 2 to 4 Nm. The proposed system is implemented by creating a MATLAB model that ensures the theoretic concept.

A Review about Flux-Weakening Operating Limits and Control Techniques for Synchronous Motor Drives

This paper deals with motor design aspects and control strategies for the flux-weakening (FW) operation of synchronous motors. The theory of FW is described by taking into account different control schemes. The advantages and drawbacks of each one are discussed, as well. Moreover, some motor design considerations for achieving an effective FW operation are illustrated for permanent magnet (PM), wound rotor (WR) and reluctance (REL) synchronous machines, using the per unit approach. The distinguishing characteristic of this review provides two-fold attention on both machine design and control strategies obtained by several collaborations with industrial and commercial companies.

Self Controlled Excitation System for Constant Power-Factor Operation of Synchronous Motor. (Dept. E)

Self Controlled Excitation System for Constant Power-Factor Operation of Synchronous Motor. (Dept. E)

Control algorithm to improve the vibronoise characteristics of synchronous multi-phase magnetoelectric electric drive

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.

Protection against the Effects of the Asynchronous Operation of Synchronous Motors Based on the Principle of Comparison of the Machine Power Factor

<span style="font-family: 'Times New Roman',serif; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-US">This paper deals with the possibility of using the principle of comparison of the operational power factor for evaluation of the asynchronous operation of synchronous motors. This way of definition of the asynchronous operation is possible to use for motors protection and other protective systems of drives with synchronous motors.</span>

Diagnostics method of developing defects in inter-pole connectors during operation of synchronous motors

The principles of damage detection of synchronous motors during operation are presented. The expediency of detecting developing defects in synchronous motors maintenance has been determined. The reasons for failure of synchronous motors of rolling mill are identified and substantiated. In proper use, the weakest point is the inter-pole connector that connects the coils of the poles in the excitation winding. The action of the contact resistance of the inter-pole connector on the thermal condition of the rotor as a whole is substantiated. The test mode method is developed to diagnose developing defects in inter-pole connector by thermal imaging control. The proposed method was tested on synchronous motors of rolling mill . The accuracy of the method is confirmed by the measurement of the contact resistance at the inter-pole connector joint and the capillary method. Recommendations were made for the application of the test mode method for the operation of synchronous motors in the conditions of continuous production.

Вплив змін напруги і частоти мережі живлення на роботу синхронних двигунів.

Вплив змін напруги і частоти мережі живлення на роботу синхронних двигунів.

Способ управления током возбуждения как средство обеспечения устойчивости работы синхронного двигателя

Способ управления током возбуждения как средство обеспечения устойчивости работы синхронного двигателя

Vector control of asymmetrical six-phase synchronous motor

AbstractVector control scheme has been well adopted for higher performance applications of AC motor. Therefore, this paper presents an extensive development and investigation of vector control scheme for asymmetrical six-phase synchronous motor in a new two-axis (M–T) coordinate system. Phasor diagram has also been developed in a simplified way, followed by its implementation technique. Analytical results have been presented for four-quadrant operation of synchronous motor, employing the developed vector control scheme. In analytical control model, common mutual leakage reactance between the two winding sets occupying same stator slot has been considered.

Parallel Sensorless Speed Control using Flux-axis Current for Dual SPMSMs Fed by a Single Inverter

This paper proposes a sensorless speed control algorithm for parallel-connected dual Surface-mounted Permanent Magnet Synchronous Motors (SPMSMs) fed by a single inverter. For stable parallel operation of synchronous motors with a single inverter, each motor has to be constantly kept in the synchronization state regardless of load torque. If the master motor with the larger load is controlled, the synchronous state will be maintained. Therefore, detection of the master motor is essential. Conventionally, the master motor is determined by comparing the rotor position error from the relation between the back-EMF for torque angle and the flux position; consequently, the position sensor is deemed essential for finding the rotor position. The parallel sensorless speed control method proposed in this paper uses no position sensor, instead it compares the flux-axis current from the connection between the back-EMF for torque angle and current in unbalanced load conditions. The results of simulation and experiment conducted verify the efficacy of the proposed method.

К выбору методов мониторинга электроприводов энергетических объектов

The analysis of methods of monitoring of driving electric motors of strong power-intensive objects on the example of electric driving gas-distributing units of compressor stations of the main transport of gas is submitted. The statistics of technical condition and safety of functioning of driving turbocompressors on objects of PJSC Gazprom is offered. The operational factors influencing on reliability of isolation the stator windings of high-voltage electric motors are considered. Hardware, methodological and algorithmic means of expeditious monitoring of technical condition and forecasting of trouble-free operation of synchronous motors are presented. It is shown that introduction of modern and reliable monitors of technical condition of units and the forecast of their resource at compressor stations allows to cut considerably operational costs and to increase safety and fail-safety of work in the regular modes, and also to carry out transition to maintenance and repair on an actual state of electric drives of electrical power objects.

Analysis of In-Plant Power Supply Load Center with Powerful Synchronous Motors and Generators of Industrial Power Station

The research group analyzed the power supply scheme of the in-plant power supply load center and carried out experimental investigations of voltage levels and reactive power flows in this center. Start and stability of the synchronous motor operation in various operation modes and line patterns were studied using a computer-based mathematical model. Technical solutions offered in the paper will provide an opportunity to reduce the synchronous motor downtime caused by voltage reduction in the mains.

Torque Control Method for Permanent Magnet Synchronous Motor Operating in Field Weakening Region at Middle Speed Range

Torque Control Method for Permanent Magnet Synchronous Motor Operating in Field Weakening Region at Middle Speed Range

A Novel VSI- and CSI-Fed Active–Reactive Induction Motor Drive with Sinusoidal Voltages and Currents

Till date load-commutated inverter (LCI)-fed synchronous motor drive configuration is popular in high power applications (>;10 MW). The leading power factor operation of synchronous motor by excitation control offers this simple and rugged drive structure. On the contrary, LCI-fed induction motor drive is absent as it always draws lagging power factor current. Therefore, complicated commutation circuit is required to switch off thyristors for a current source inverter (CSI)-driven induction motor. It poses the major hindrance to scale up the power rating of CSI-fed induction motor drive. A new power topology for LCI-fed induction motor drive for medium-voltage drive application is proposed. A new induction machine (active-reactive induction machine) with two sets of three-phase winding is introduced as a drive motor. The proposed power configuration ensures sinusoidal voltage and current at the motor terminals. The total drive power is shared among a thyristor-based LCI, an insulated gate bipolar transistor (IGBT)-based two-level voltage source inverter (VSI), and a three-level VSI. The benefits of SCRs and IGBTs are explored in the proposed drive. Experimental results from a prototype drive verify the basic concepts of the drive.

Matlab™ Simulation of an Exact Mathematical Model of the Permanent Magnet Synchronous Motor With a Discontinuous Current Mode Operation

An exact model of a permanent magnet synchronous motor operating in the discontinuous current mode is developed. This motor behaves differently under light-and heavy-load conditions. Our mathematical model, based on this exact model, can represent motor responses under all of the different load conditions. Moreover, it can explain the flux-weakening effect with the phase-advanced angle. The model is implemented by using MATLAB™, which can solve the initial value problem of the represented systems described with complicated differential equations. In comparison with the PSPICE ™ platform, MATLAB™ is more convenient for designers to predict and evaluate the performance of their systems.

DC Link Pulsing Starting-Up and Low Speed Operation of Synchronous Motors

DC Link Pulsing Starting-Up and Low Speed Operation of Synchronous Motors