Search

To improve the chattering problem caused by the terminal sliding mode control (TSMC) and sliding mode observer (SMO) in permanent magnet synchronous linear motor (PMLSM) control systems, this study presents the design of a continuous terminal sliding mode control (CTSMC) controller and an improved SMO. By enhancing the sliding mode surface, CTSMC enhances the dynamic response and robustness of the system. The observer replaces the traditional sliding mode switching law with a super-twisting (ST) algorithm, a twisting algorithm that makes use of the structural characteristics of the second-order sliding mode to ensure output continuity and reduce the observed buffeting. The sliding mode gain of the ST algorithm is optimized using the particle swarm optimization (PSO) algorithm to acquire the optimal parameters and fully exploit the observer's performance potential. Finally, the proposed method is simulated and tested. The comparison results show that the proposed method boosts the system's dynamic response and robustness and reduces chattering. [ABSTRACT FROM AUTHOR]

To enhance the control performance of a permanent magnet linear synchronous motor (PMLSM) and to improve its dynamic response performance and steady-state accuracy, a PMLSM model predictive integrated control (MPC) system based on a super-twisting sliding mode observer (ST-SMO) is proposed. According to the mathematical model of a PMLSM, this paper designs a three-step model to predict the comprehensive control correction factor, optimize the prediction speed and current, reduce the response time, and enhance the system's stability. Meanwhile, in order to solve the problem of the PMLSM's high dependence on mechanical sensors, the ST-SMO is introduced to observe the rotation speed of PMLSM, which has better tracking performance and observation accuracy than a traditional sliding mode observer (SMO). Finally, the experimental verification is carried out on the PMLSM experimental platform. The software simulation and hardware experiment results show that the control system designed in this paper not only simplifies the overall structure of the system, but it also has better control performance and tracking ability. Compared with traditional control methods and SMO, it has better control performance, stability, and speed-tracking performance. [ABSTRACT FROM AUTHOR]

With the development of clean technology, inefficient motors that have been used for many years and the recyclable motor with damaged components are facing phase-out and scrap, leaving a large amount of waste resources and serious environmental pollution problems to be solved urgently. The purpose of this paper is to research the remanufacturing technology of obsolete permanent magnet synchronous motor (PMSM) and explore its future development prospects. In this paper, the PMSM is explored through theoretical analysis and finite element simulation, constructing the evaluation system of the remanufacturing of PMSM, and analyze the key problems of the remanufacturing scheme and design of PMSM. Secondly, the finite element model of the damaged PMSM is restored, by combining theory and magnetic thermal coupling simulation, the temperature of the motor is analyzed, and the data comparison of the finite element simulation is carried out with the experimental results, verifying the feasibility of remanufacturing of PMSM. On this basis, a water cooling structure is added to protect the stator winding insulation from high temperature damage and prevent the permanent magnet from demagnetizing due to high temperature., ensure the reliability of the motor under long-term operation, which prolongs the life of the motor, indirectly reduces the consumption of the motor manufacturing industry, reduces pollutants, saves energy and enterprise production costs, and promotes the sound development of motor in manufacturing industry. [ABSTRACT FROM AUTHOR]

Temperature rise has always been one of the main researchfocusesof the motor. When the temperature is too high, it will have a serious impact on the stability and reliability of motor performance. Due to the special structure of electromagnetic piezoelectric hybrid drive motor (EPHDM), the loss and temperature distribution of electromagnetic drive part and piezoelectric drive part werestudied. By analyzing the operation principle of the motor, the loss of each part wasresearched. On this basis, the loss of the electromagnetic driving part and piezoelectric driving part werecomputed by using the coupling iterative calculation method. The temperature contour map of the motor wasanalyzed by simulation, and the temperature characteristics of each part of the motor werestudied. Finally, the experimental verification of the prototype, the reliability of the theoretical model, and simulation results wereproved. The results showed that the temperature distribution of the motor is reasonable, the winding temperature is relatively high, and the core temperature and piezoelectric stator temperature are relatively low. The analytical and experimental methods are provided for the further study of heat source optimization. [ABSTRACT FROM AUTHOR]

Piezoelectric-driven multi-degree-of-freedom motors can turn off self-lock, withstand high and low temperatures, are small in size and compact in structure, and can easily achieve miniaturization. However, they have a short life cycle and limited applications. In addition, high-intensity operation will result in a decrease in their stability. Electromagnetic-driven multi-degree-of-freedom motors, on the other hand, are simple and highly integrated, but they are large in volume and lack positioning accuracy. Therefore, combining the two drive modes can achieve complementary advantages, such as improving the motor's torque, accuracy, and output performance. Firstly, the structure of the hybrid drive motor is introduced and its working principle is analyzed. The motor can achieve single and hybrid drive control, which is beneficial to improving the performance of the motor. Secondly, the influence of magnetization mode, permanent magnet thickness, slot torque, and stator mode on the motor is analyzed. Thirdly, the structure of the motor is determined to be 6 poles and 15 slots, the thickness of the permanent magnet is 12 mm, and the radial magnetization mode is used. Finally, the mixed torque and speed of the motor in the multi-degree-of-freedom direction are tested by experiments, which indirectly verifies the rationality of the structure design. [ABSTRACT FROM AUTHOR]

A piezoelectric actuator (PEA) has the characteristics of high control precision and no electromagnetic interference. To improve the degree of freedom (DOF) to adapt to more working scenes, a piezoelectric–electromagnetic hybrid-driven two-DOF actuator is proposed. The PEA adopts the composite structure of the lever amplification mechanism and triangular amplification mechanism. The structure effectively amplifies the output displacement of the piezoelectric stack and increases the clamping force between the driving foot and the mover. The electromagnetic actuator (EMA) adopts a multi-stage fractional slot concentrated winding permanent magnet synchronous actuator, which can better match the characteristics of PEA. The structure and working principle of the actuator are introduced, the dynamic analysis is carried out, and the factors affecting the clamping force are obtained. At the same time, the air gap magnetic field is analyzed, and the structural size of the actuator is optimized. The experiment shows that the maximum driving speed can reach 348 mm/s, the load capacity is 3 kg, the optimal initial rotor angle is 49°, the maximum torque is 2.9 N·m and the maximum speed is 9 rad/s, which proves the stability and feasibility of the actuator. [ABSTRACT FROM AUTHOR]

In recent years, the world has paid more and more attention to the waste of resources and energy consumption. Enterprises in various countries hope to promote sustainable development through the recycling of products and at the same time improve their competitiveness in the global market environment. From the perspective of green and circular economy, the motor manufacturing industry can reduce cost and satisfy the requirements of green production by recycling and dismantling the discarded but valuable materials, and remanufacturing motors with ineffective designs. Based on the large-scale asynchronous motor, this article gives the scheme and process of remanufacturing to a permanent magnet synchronous motor, including the disassembly, life evaluation, design and remanufacturing of the motor. The permanent magnet rotor was used to replace the squirrel-cage rotor of the asynchronous motor, and the magneto-thermal coupling analysis of the new motor is carried out by finite element method. The simulation and the experimental results were compared to verify the feasibility of recycling and remanufacturing of the asynchronous motor. A simple economic comparison was made with scrapped and manufactured new motors to verify the practical significance of the transformation technology, which simplifies the recycling process, reduces recycling costs, and increases the utilization rate of used motors. The analysis results provide the guide and show the important significance for the motor remanufacturing industry for the circular economy. [ABSTRACT FROM AUTHOR]