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14 pages, 4679 KiB

Open AccessArticle

A Sensorless Control Strategy for Permanent Magnet Synchronous Motor at Low Switching Frequency

by Zhao Xue, Lin Li, Xiaolu Wang and Xin Wang

Electronics 2022, 11(13), 1957; https://doi.org/10.3390/electronics11131957 - 22 Jun 2022

Cited by 3 | Viewed by 1956

Abstract

The high-frequency (HF) square-wave voltage injection method can be used in permanent magnet synchronous motor (PMSM) drive systems. However, when the switching frequency is too low, the injection frequency will also decrease, which will reduce the update frequency of the HF response current, [...] Read more.

The high-frequency (HF) square-wave voltage injection method can be used in permanent magnet synchronous motor (PMSM) drive systems. However, when the switching frequency is too low, the injection frequency will also decrease, which will reduce the update frequency of the HF response current, making it difficult to extract the position quadrature signal and affecting the accuracy of position estimation and control performance. This paper proposes a method for extracting position quadrature signals based on sampling rate transformation, and a signal processing strategy based on Cascade Integrator Comb (CIC) interpolation filtering, which can solve the problem of waveform distortion caused by the low sampling rate of the extracted position quadrature signal. This strategy can increase the sampling rate of the position quadrature signal to the pulse width modulation (PWM) update frequency by interpolating in the sampling current, thereby reducing the harmonic content of the position quadrature signal and improving the position estimation. precision. In addition, the PWM update frequency and estimated rotational speed information are used to compensate for the delay caused by position estimation and inverter update, which effectively improves the accuracy of position estimation. Finally, the effectiveness of the proposed control strategy is verified by simulation. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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14 pages, 4178 KiB

Open AccessArticle

Estimation of Total Nitrogen Content in Rubber Plantation Soil Based on Hyperspectral and Fractional Order Derivative

by Rongnian Tang, Xiaowei Li, Chuang Li, Kaixuan Jiang, Wenfeng Hu and Jingjin Wu

Electronics 2022, 11(13), 1956; https://doi.org/10.3390/electronics11131956 - 22 Jun 2022

Cited by 5 | Viewed by 1881

Abstract

Soil total nitrogen (TN) is a vital nutrient element that affects the growth and rubber production of rubber trees. Especially in the coastal environment, soil nutrients will show significant differences. Using hyperspectral technology to detect soil nitrogen ion content in the offshore environment [...] Read more.

Soil total nitrogen (TN) is a vital nutrient element that affects the growth and rubber production of rubber trees. Especially in the coastal environment, soil nutrients will show significant differences. Using hyperspectral technology to detect soil nitrogen ion content in the offshore environment can provide technical support for nutrient management. Preprocessing hyperspectral data is a crucial step in accurate spectral model estimation. At the same time, it is considered that the traditional first-order and second-order derivatives are easily unbalanced between the signal-to-noise ratio, resulting in the loss of adequate information. Therefore, this work focuses on the feasibility of fractional order derivative (FOD) combined with partial least squares regression (PLSR) to estimate its TN content. By collecting soil samples from rubber plantations, the TN content of the soil samples was determined, and the spectral reflectance was measured. The FOD of the original spectrum was preprocessed with an interval of 0.2, and 11 spectral curves were obtained. Then, successive projections algorithm (SPA) was used to extract spectral features, and partial least squares regression (PLSR) models of soil TN content were established. The research results show that compared with the traditional integer derivative, FOD has a tremendous advantage in balancing spectral information and noise and can provide more abundant characteristic variables, which helps establish a more robust estimation model. In the range of orders 0–2, the model established by the 1.8-order is the best. Under that circumstance, the determination coefficients of validation (R²v) is 0.649, and the ratio of the performance to deviation (RPD) is 1.72. Combined with FOD, it is feasible and practical to establish an accurate and rapid estimation model of soil TN content, which can provide an important reference for large-scale detection of soil TN content in rubber plantations. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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12 pages, 4118 KiB

Open AccessArticle

Research on Buffer Characteristics of a New 2D Digital Buffer Valve for Vehicle Shift

by Qihui Zhang, Yi Liu, Wei Xiong, Jian Ruan, Jun Tang and Janping Tan

Electronics 2022, 11(12), 1846; https://doi.org/10.3390/electronics11121846 - 10 Jun 2022

Cited by 2 | Viewed by 1885

Abstract

The clutch is currently developing towards high power, high stability, and intelligent operation. The traditional hydraulic buffering valve mostly uses a passive hydraulic buffer valve or a high speed on-off valve and a proportion valve. It has a single buffering characteristic and poor [...] Read more.

The clutch is currently developing towards high power, high stability, and intelligent operation. The traditional hydraulic buffering valve mostly uses a passive hydraulic buffer valve or a high speed on-off valve and a proportion valve. It has a single buffering characteristic and poor adaptability. It is difficult to meet the requirements. Therefore, a new theory and a new method are proposed. In the field of clutch oil pressure control, the 2D digital buffer valve is designed using 2D digital technology. The structure of the 2D digital buffering valve is described. Based on the working principle of the valve, a mathematical model is set up. MATLAB/Simulink is used to solve the model. The results are analyzed in this paper. Finally, a valve test platform is built and an experimental study carried out. The research indicates that the 2D digital buffering valve has a good static characteristic. The linearity is 9.25%, and the hysteresis is 0.106. The response time of the 2D digital buffer valve is about 55 ms, and the valve overshoot is only 18.62%. During shifting, the maximum deviation is 0.165 MPa, and the steady-state error is 0.056 MPa. Different buffer control signals as the input and the output of the valve can follow the input change. The experimental and simulation results are consistent. The rationality of the mathematical model has been verified. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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21 pages, 6250 KiB

Open AccessArticle

SLAM, Path Planning Algorithm and Application Research of an Indoor Substation Wheeled Robot Navigation System

by Jianxin Ren, Tao Wu, Xiaohua Zhou, Congcong Yang, Jiahui Sun, Mingshuo Li, Huayang Jiang and Anfeng Zhang

Electronics 2022, 11(12), 1838; https://doi.org/10.3390/electronics11121838 - 9 Jun 2022

Cited by 14 | Viewed by 5307

Abstract

Staff safety is not assured due to the indoor substation’s high environmental risk factor. The Chinese State Grid Corporation has been engaged in the intelligentization of substations and the employment of robots for inspection tasks. The autonomous navigation and positioning system of the [...] Read more.

Staff safety is not assured due to the indoor substation’s high environmental risk factor. The Chinese State Grid Corporation has been engaged in the intelligentization of substations and the employment of robots for inspection tasks. The autonomous navigation and positioning system of the mobile chassis is the most important feature of this type of robot, as it allows the robot to perceive the surrounding environment information at the initial position using its own sensors and find a suitable path to move to the target point to complete the task. Automatic navigation is the basis for the intelligentization of indoor substation robots, which is of great significance to the efficient and safe inspection of indoor substations. Based on this, this paper formulates a new navigation system, and builds a chassis simulation environment in the Robot Operating System (ROS). To begin with, we develop a novel hardware and sensor-based chassis navigation system experimental platform. Secondly, to conduct the fusion of the odometer and inertial navigation data, the Extended Kalman Filter (EKF) is used. The map’s creation approach determines how the environmental map is created. The global path is scheduled with the A* algorithm, whereas the local path is scheduled with the Dynamic Window Method (DWA). Finally, the created robot navigation system is applied to an auxiliary operation robot chassis suited for power distribution cabinet switch and the navigation system’s experimental analysis is conducted using this platform, demonstrating the system’s efficacy and practicability. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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21 pages, 3074 KiB

Open AccessArticle

RETRACTED: Energy Efficiency Maximization for Hybrid-Powered 5G Networks with Energy Cooperation

by Yang Cao, Ye Zhong, Xiaofeng Peng and Song Pan

Electronics 2022, 11(10), 1605; https://doi.org/10.3390/electronics11101605 - 18 May 2022

Cited by 5 | Viewed by 2404 | Retraction

Abstract

The extensive deployment of 5G cellular networks causes increased energy consumption and interference in systems, and to address this problem, this paper investigates the optimization problem of joint energy harvesting and energy cooperation to maximize energy efficiency (EE). First, considering user equipment (UE) [...] Read more.

The extensive deployment of 5G cellular networks causes increased energy consumption and interference in systems, and to address this problem, this paper investigates the optimization problem of joint energy harvesting and energy cooperation to maximize energy efficiency (EE). First, considering user equipment (UE) quality of service (QoS) constraints, cellular base station power constraints, and renewable energy harvesting constraints, we construct a mixed-integer nonlinear programming problem for joint resource allocation. This problem is difficult to solve directly, thus we combine the fixed-variable method to solve the complex original problem in three less difficult subproblems of user association, power allocation, and energy cooperation by solving them separately using Lagrangian method, improved particle swarm optimization algorithm, and matching theory, respectively. Finally, the final solution to the original problem is obtained by combining the above three algorithms through convergent iterative algorithms. The simulation results show that the joint algorithm proposed in this paper has a better performance in throughput and energy efficiency compared with the comparison algorithms. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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13 pages, 1985 KiB

Open AccessArticle

Research on Polarization Coding Cooperative Communication Scheme for FSO System

by Yang Cao, Huaijun Qin, Xiaofeng Peng, Yuhan Wang and Zupeng Zhang

Electronics 2022, 11(10), 1597; https://doi.org/10.3390/electronics11101597 - 17 May 2022

Cited by 2 | Viewed by 1346

Abstract

To solve the problems of interruption events and the high bit-error rate of the FSO system caused by atmospheric turbulence, an FSO cooperative communication scheme based on system polarization code is proposed. In this scheme, the upper limit of the average bit-error rate [...] Read more.

To solve the problems of interruption events and the high bit-error rate of the FSO system caused by atmospheric turbulence, an FSO cooperative communication scheme based on system polarization code is proposed. In this scheme, the upper limit of the average bit-error rate of the atmospheric turbulence channel is used to construct the frozen bit set of the system polarization code, and the information bit set of the

S - R

link is recovered by using the ownership relationship between the frozen bit set of the

S - R

link and the

S - D

link at the destination node. Finally, the information bits of the

S - R

link and

S - D

link are combined using equal gain combination, and the original information is recovered by decoding. The simulation results show that the FSO cooperative communication system can overcome the influence of atmospheric turbulence and improve the system performance, and the bit-error rate performance of the FSO cooperative communication system can be improved by at least 0.5dB; the outage probability of the FSO cooperative communication system can be reduced to less than 10⁻⁷, and it shows a stable inhibitory effect on strong turbulence conditions. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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13 pages, 4221 KiB

Open AccessArticle

Research on Orbital Angular Momentum Multiplexing Communication System Based on Neural Network Inversion of Phase

by Yang Cao, Zupeng Zhang, Xiaofeng Peng, Yuhan Wang and Huaijun Qin

Electronics 2022, 11(10), 1592; https://doi.org/10.3390/electronics11101592 - 17 May 2022

Cited by 1 | Viewed by 1806

Abstract

An adaptive optical wavefront recovery method based on a residual attention network is proposed for the degradation of an Orbital Angular Momentum multiplexing communication system performance caused by atmospheric turbulence in free-space optical communication. To prevent the degeneration phenomenon of neural networks, the [...] Read more.

An adaptive optical wavefront recovery method based on a residual attention network is proposed for the degradation of an Orbital Angular Momentum multiplexing communication system performance caused by atmospheric turbulence in free-space optical communication. To prevent the degeneration phenomenon of neural networks, the residual network is used as the backbone network, and a multi-scale residual hybrid attention network is constructed. Distributed feature extraction by convolutional kernels at different scales is used to enhance the network’s ability to represent light intensity image features. The attention mechanism is used to improve the recognition rate of the network for broken light spot features. The network loss function is designed by combining realistic evaluation indexes so as to obtain Zernike coefficients that match the actual wavefront aberration. Simulation experiments are carried out for different atmospheric turbulence intensity conditions, and the results show that the residual attention network can reconstruct the turbulent phase quickly and accurately. The peaks to valleys of the recovered residual aberrations were between 0.1 and 0.3 rad, and the root means square was between 0.02 and 0.12 rad. The results obtained by the residual attention network are better than those of the conventional network at different SNRs. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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16 pages, 2677 KiB

Open AccessArticle

An Additive Manufacturing Direct Slicing Algorithm Based on a STEP Model

by Xingguo Han, Zhuangchao Zhan, Xiaohui Song and Lixiu Cui

Electronics 2022, 11(10), 1582; https://doi.org/10.3390/electronics11101582 - 16 May 2022

Cited by 3 | Viewed by 2760

Abstract

The Standard Template Library (STL) file is the most common data format for the description of an additive manufacturing (AM) geometric model, but it has some disadvantages, such as large errors of the geometric model description, the easy loss of topology information, data [...] Read more.

The Standard Template Library (STL) file is the most common data format for the description of an additive manufacturing (AM) geometric model, but it has some disadvantages, such as large errors of the geometric model description, the easy loss of topology information, data duplication, large file sizes, and so on. Aiming at these problems, a direct slicing algorithm based on a Standard for the Exchange of Product Model Data (STEP) model was proposed. For the parts composed of basic types of surfaces such as boundary curves, spherical surfaces and cylindrical surfaces, the traditional geometric method was used to calculate the intersection. For the parts with complex surfaces, the three-dimensional models were described based on Non-Uniform Rational B-Spline (NURBS) surfaces. The NURBS surfaces were layered using a discrete tracking algorithm, the tracking starting point was determined, the intersection line between the tangent plane and each NURBS sub-surface was obtained, and the closed layer contour was formed. Finally, the slicing simulations and printing experiments of solid parts were carried out using the direct slicing algorithm based on the STEP model. It was shown that the dimensional accuracy and surface quality of the printed parts from this algorithm had been significantly improved. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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16 pages, 6533 KiB

Open AccessArticle

Research on the Finite Time Compound Control of Continuous Rotary Motor Electro-Hydraulic Servo System

by Xiao-Jing Wang, Qi-Zheng Zhang and Chun-Hui Li

Electronics 2022, 11(10), 1515; https://doi.org/10.3390/electronics11101515 - 10 May 2022

Viewed by 1598

Abstract

Aiming at the influence of friction, leakage, noise and other nonlinear factors on the performance of the electro-hydraulic servo system of a continuous rotary motor, a finite-time composite controller for the aforementioned servo system is proposed. First, a mathematical model of the electro-hydraulic [...] Read more.

Aiming at the influence of friction, leakage, noise and other nonlinear factors on the performance of the electro-hydraulic servo system of a continuous rotary motor, a finite-time composite controller for the aforementioned servo system is proposed. First, a mathematical model of the electro-hydraulic servo system was analyzed, and the input and output angle data of the motor were collected for system identification. Subsequently, the ARMAX identification model of the continuous rotary motor system was obtained. Then, according to the observed advantages, namely faster capability of the finite-time controller (FTC) to converge the system, and ability of the finite-time observer to reduce the steady-state error of the system, the finite-time controller and finite-time state observer of a continuous rotary electro-hydraulic servo motor were respectively designed. Finally, comparison with PID control simulation shows that the compound controller could effectively improve the control accuracy and performance of the system. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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15 pages, 1868 KiB

Open AccessArticle

Study on Static Characteristics of Ultra-Precision Aerostatic Motorized Spindle under Gas–Magnetic Field Coupling

by Wenbo Wang, Pengyun Song, Hechun Yu and Guoqing Zhang

Electronics 2022, 11(9), 1434; https://doi.org/10.3390/electronics11091434 - 29 Apr 2022

Viewed by 1608

Abstract

In the working process of ultra-precision aerostatic motorized spindles, the journal and the rotor must have a certain eccentricity to have a certain bearing capacity and stiffness, which will induce the unbalanced magnetic pull (UMP). The intercoupling of the UMP and the gas [...] Read more.

In the working process of ultra-precision aerostatic motorized spindles, the journal and the rotor must have a certain eccentricity to have a certain bearing capacity and stiffness, which will induce the unbalanced magnetic pull (UMP). The intercoupling of the UMP and the gas film force will affect the motion state of the rotor and the accuracy of spindles. In order to deeply study the influence of the UMP caused by the rotor eccentricity on the equilibrium position of aerostatic spindles, a physical model of an aerostatic spindle based on slit throttling gas bearing is established and the coupling effect between the rotor and the motor rotor is studied and analyzed as a whole. The equilibrium position of the rotor under the combined action of gravity, the gas film force and the UMP is deduced, and a gas–magnetic field coupling calculation program based on the finite difference method is proposed. The calculation results show that with the increase in rotational speed, the equilibrium position of the rotor will move to the center of the journal in the micron scale, and the moving amplitude will gradually slow down. The UMP caused by rotor eccentricity can offset the rotor equilibrium position in nanometer scale, and the influence degree decreases sharply as the rotor moves to the journal center. With the increase in rotational speed, the direct stiffness and the cross stiffness will increase, and the amplitude of the cross stiffness is greater than the direct stiffness. This study is of great significance for further studying the influence of the rotor eccentricity on the equilibrium position and the accuracy of the rotor. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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23 pages, 5384 KiB

Open AccessArticle

Research on the Modeling of Bending-Torsional Coupling and Vibration Characteristics of Planetary Roller Screw Mechanism

by Linping Wu, Shangjun Ma, Pan Deng and Qiangqiang Huang

Electronics 2022, 11(9), 1395; https://doi.org/10.3390/electronics11091395 - 27 Apr 2022

Cited by 4 | Viewed by 2006

Abstract

A general bending-torsional coupling dynamic model of the planetary roller screw mechanism is developed by the lumped mass method in this paper to analyze the vibration characteristics. Firstly, the components of the planetary roller screw mechanism are treated as lumped mass, and the [...] Read more.

A general bending-torsional coupling dynamic model of the planetary roller screw mechanism is developed by the lumped mass method in this paper to analyze the vibration characteristics. Firstly, the components of the planetary roller screw mechanism are treated as lumped mass, and the meshing relationships are expressed by the spring element. Secondly, the natural vibration characteristics of the planetary roller screw mechanism are analyzed, and four vibration modes based on the bending-torsional coupling dynamic model are summarized: carrier mode, torsional mode, transverse mode and roller mode. This reveals the vibration characteristics when the two kinds of meshing pairs (thread pair and gear pair) come into meshing synchronously. Then, the relationships between the structural parameters and the natural frequency of each vibration mode are discussed. Finally, the matrix equation is simplified according to the characteristics of vibration mode, and the analytic expressions of natural frequency under carrier mode and roller mode are obtained. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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16 pages, 2516 KiB

Open AccessArticle

Evaluation of the Influence of Shaft Shape Errors on the Rotation Accuracy of Aerostatic Spindle—Part 1: Modeling

by Guoqing Zhang, Jianming Zheng, Hechun Yu, Ting Chen, Kai Zhang and Guozhu Dou

Electronics 2022, 11(9), 1304; https://doi.org/10.3390/electronics11091304 - 20 Apr 2022

Cited by 3 | Viewed by 2042

Abstract

In the research on the aerostatic spindle, for quantifying the influence of shaft shape errors on its rotation accuracy, the calculation models of unbalanced air film force (UAFF) and centrifugal inertia force (CIF) are established. Based on the typical shape of the shaft, [...] Read more.

In the research on the aerostatic spindle, for quantifying the influence of shaft shape errors on its rotation accuracy, the calculation models of unbalanced air film force (UAFF) and centrifugal inertia force (CIF) are established. Based on the typical shape of the shaft, three composite cylinder models are constructed. The data sources are selected from the cylindricity measurement results of the shaft and substituted into the model for calculation. The results show that, for the shaft in this paper, when the roundness deviation is ≤1.25 μm and the cylindricity deviation is ≤2 μm, the influence of shape errors on the rotation accuracy of the shaft is small enough. The harmonic analysis of the data source shows that the magnitude and stability of the UAFF on the shaft are determined by the actual shape of the shaft’s cylindrical surface, and cannot be inferred only by the value of shape errors. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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18 pages, 10859 KiB

Open AccessArticle

Research on Stability Control Method of Electro-Mechanical Actuator under the Influence of Lateral Force

by Shuai Wu, Yong Zhou, Jianxin Zhang, Shangjun Ma and Yunxiao Lian

Electronics 2022, 11(8), 1237; https://doi.org/10.3390/electronics11081237 - 14 Apr 2022

Cited by 2 | Viewed by 2350

Abstract

This paper takes a multi-stage Electro-mechanical Actuator (EMA) as the research object, analyzes the lateral force of the multi-stage EMA in the vertical state, and the overall mathematical model of the multi-stage EMA system. Firstly, a permanent magnet synchronous motor module is built [...] Read more.

This paper takes a multi-stage Electro-mechanical Actuator (EMA) as the research object, analyzes the lateral force of the multi-stage EMA in the vertical state, and the overall mathematical model of the multi-stage EMA system. Firstly, a permanent magnet synchronous motor module is built in JMAG according to the engineering requirements. Then, the electrical control part and mechanical transmission part of the multi-stage EMA are established in AMESim, and the ideal motor module in AMESim is replaced with the motor model designed by JMAG to construct the overall model of the multi-stage EMA. The dynamic simulation model of lateral force is established in ADAMS to accurately simulate the impact of wind load on EMA in the actual environment, and this model is introduced into AMESim instead of the lead screw and nut module in AMESim. The improved active disturbance rejection control (ADRC) is used to replace the speed loop and positional loop in the traditional three closed-loop control, and the whole system stability servo control of multi-stage EMA is co-simulated. Finally, the experiment of the designed control method is carried out by LabVIEW. The result of the experiment shows that the multi-stage EMA system can effectively suppress the lateral force under the active disturbance rejection control and ensure the stable operation of the multi-stage EMA system. In addition, the system built by the co-simulation method is closer to real working conditions than the traditional mathematical model. The control parameters in the simulation can be effectively transplanted to the actual system with only minor adjustment to meet the engineering requirements. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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17 pages, 6890 KiB

Open AccessArticle

Research on Inter-Turn Short Circuit Fault Diagnosis of Electromechanical Actuator Based on Transfer Learning and VGG16

by Haibin Huangfu, Yong Zhou, Jianxin Zhang, Shangjun Ma, Qian Fang and Ye Wang

Electronics 2022, 11(8), 1232; https://doi.org/10.3390/electronics11081232 - 13 Apr 2022

Cited by 7 | Viewed by 2240

Abstract

In this paper, an inter-turn short-circuit fault of a permanent magnet synchronous motor in an electromechanical actuator is analyzed, and a fault diagnosis method based on transfer learning with a VGG16 convolution network is proposed. First, a 2D finite element model of an [...] Read more.

In this paper, an inter-turn short-circuit fault of a permanent magnet synchronous motor in an electromechanical actuator is analyzed, and a fault diagnosis method based on transfer learning with a VGG16 convolution network is proposed. First, a 2D finite element model of an inter-turn short circuit fault of a permanent magnet synchronous motor was established in ANSOFT Maxwell, and then a simulation experiment analysis was completed. A three-phase current was chosen as a fault characteristic signal. Second, a fault diagnosis method with a VGG16 deep convolutional neural network and based on transfer learning was designed, and the fine tuning of the hyperparameters of the fault diagnosis model was completed by using grid search and cross verification methods. Finally, based on the transfer learning VGG16 model established in this paper, the inter-turn short circuit fault of a permanent magnetic synchronous machine (PMSM) was diagnosed and verified. The experimental results showed that the proposed convolutional network model based on transfer learning can identify faults effectively and accurately, and has a good engineering guidance significance. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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19 pages, 4468 KiB

Open AccessArticle

Research on Fractional-Order Global Fast Terminal Sliding Mode Control of MDF Continuous Hot-Pressing Position Servo System Based on Adaptive RBF Neural Network

by Liangkuan Zhu, Xinrui Chen, Xing Qi and Jian Zhang

Electronics 2022, 11(7), 1117; https://doi.org/10.3390/electronics11071117 - 1 Apr 2022

Cited by 2 | Viewed by 2093

Abstract

In this paper, a novel fractional-order global fast terminal sliding mode control (FGFTSMC) strategy based on an adaptive radial basis function (RBF) neural network is proposed to improve the performance of a medium density fiberboard (MDF) continuous hot-pressing position servo system with parameter [...] Read more.

In this paper, a novel fractional-order global fast terminal sliding mode control (FGFTSMC) strategy based on an adaptive radial basis function (RBF) neural network is proposed to improve the performance of a medium density fiberboard (MDF) continuous hot-pressing position servo system with parameter perturbation and external load disturbance. Primarily, the mathematical model of the MDF continuous hot-pressing position servo system is constructed based on the dynamic equation of the hydraulic system. Then, a FGFTSMC is designed to speed up the convergence rate of the system, in which an adaptive law is used to estimate the upper bound of the unknown parameters to overcome the existing parameter perturbation of the system. In addition, an RBF neural network is introduced to approximate the external load disturbance of the system. The stability of MDF continuous hot-pressing position servo system based on the control scheme developed in this paper is proven using the Lyapunov theory. Finally, the simulation results show that the presented control scheme can effectively ensure the tracking accuracy of the system and enhance the robustness of the system. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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Review

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24 pages, 3282 KiB

Open AccessReview

Parameters Identification of a Permanent Magnet DC Motor: A Review

by Mohamad Farid Fazdi and Po-Wen Hsueh

Electronics 2023, 12(12), 2559; https://doi.org/10.3390/electronics12122559 - 6 Jun 2023

Cited by 14 | Viewed by 6502

Abstract

Since permanent magnet direct current (DC) motors are mainly used in various industrial automation applications, the demand for electric motors is increasing rapidly. However, in the mass production of electric motors, often, only random inspections are used to check the specifications and performance [...] Read more.

Since permanent magnet direct current (DC) motors are mainly used in various industrial automation applications, the demand for electric motors is increasing rapidly. However, in the mass production of electric motors, often, only random inspections are used to check the specifications and performance of electric motors. For manufacturing or engineering application staff to have a more thorough understanding of the characteristics of the motor, it is necessary to conduct a full or quick inspection during the production process to ensure the quality of the electric motor. Based on this, this literature review reveals several methods and algorithms often used to estimate DC motor parameters, given the importance of knowing the parameters of the DC motor and the lack of research on estimating the parameters of the DC motor. Full article

(This article belongs to the Special Issue Mechatronic Control Engineering)

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