International Journal of Applied Electromagnetics and Mechanics - Volume Pre-press, issue Pre-press

Authors: Yin, Shuli | Sato, Kazuki | Ito, Yuki | Ota, Hiroaki | Otomo, Yoshitsugu | Igarashi, Hajime

Article Type: Research Article

Abstract: An automatic design optimization of a wireless power transfer system is performed using Monte Carlo tree search (MCTS). Several key factors, i.e., the compensation network, shapes and geometrical parameters of the coils are determined after searches, in order to achieve the high transfer efficiencies for coaxial aligned and misaligned cases. The improved Selection policy in MCTS, called first play urgency (FPU), is implemented for optimization. It proves to be a more promising technique for finding optimal solutions when the searching volume is limited, compared with the original MCTS with using the upper confidence bound applies to tree (UCB1).

Keywords: First play urgency, Monte Carlo tree search, optimal design, wireless power transfer systems

DOI: 10.3233/JAE-230220

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-13, 2024

Authors: Ke, Zhihao | Yi, Huiyang | Zhang, Penghui | Feng, Yuexin | Liang, Le | Deng, Zigang

Article Type: Research Article

Abstract: A model predictive control (MPC) method based on Q-learning algorithm, named QMPC, is proposed for weakly damped, nonlinear and open-loop unstable magnetic levitation platform (MLP) systems. In addition, the design of MPC controller for the MLP system, the state space of the MLP system airgap, the action space of the predictive horizon and control horizon, the reward and punishment function are also included in this research. Based on the Simscape and MATLAB/Simulink, the joint simulation of the MLP control system is realized. Compared with PID controller and traditional MPC controller, the simulation results show that QMPC controller has better disturbance …rejection ability and tracking performance under six working conditions. Show more

Keywords: Magnetic levitation platform, Q-learning algorithm, model predictive control, disturbance rejection ability, tracking performance

DOI: 10.3233/JAE-240003

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-24, 2024

Authors: Zhao, Shuai | Xu, Xinjun | Bi, Yaxuan

Article Type: Research Article

Abstract: Taking the surface profile of C45 steel grinding as the research object, a two-dimensional finite element contact model of rough surface and smooth rigid surface was established by using ANSYS software, and the stress distribution characteristics and rules of contact surface were analyzed under 0–10 MPa normal load. On this basis, the force-magnetic coupling model was established by using ANSYS APDL language. Furthermore, the influence of stress under on leakage magnetic field of contact surface under different load conditions was studied. The results indicated that according to the zero-crossing point of the normal component of the leakage magnetic field or the …extreme point of the tangential component, the number of stress concentrations on the contact surface and the stress level of the corresponding area can be effectively determined. This innovative approach offers valuable insights for future studies on surface contact stress distribution between components. Show more

Keywords: Rough surface, surface contact property, finite element method, stress-magnetization effect

DOI: 10.3233/JAE-230407

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-10, 2024

Authors: Yang, Chaojun | Zheng, Shaoqing | Peng, Zhizhuo | Zhu, Jiwei | Ding, Yifei

Article Type: Research Article

Abstract: In this paper, a steady-state and dynamic response model is proposed to predict the working characteristics of the electromechanical transmission system including eddy-current magnetic couplers. Considering the influence of mechanical characteristics of motor and load device on the performance of eddy-current magnetic couplers, the system is divided into input and output for kinematic analysis. The expressions of electromagnetic torque versus speed are obtained through layer analysis of the eddy-current magnetic coupler during steady-state and then, the dynamic response model of the system is established by combining the kinematic analysis with the motor, the eddy-current magnetic coupler and three typical loads …(constant torque load, quadratic rate load and constant power load). The dynamic characteristics during starting and speed-regulation of the system under constant torque loads are analyzed using the proposed model. The variations of the torque and speed with time of input and output are calculated by numerical integration. Finally, the speed and torque during starting and speed-regulation computed with the dynamic response model are compared with those obtained from the experimental results. The result shows a good agreement. Show more

Keywords: Electromechanical transmission system, eddy-current magnetic couplers, a steady-state and dynamic response, working characteristics, mechanical characteristic, kinematic analysis

DOI: 10.3233/JAE-230111

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-22, 2024

Authors: Guo, Liyan | Sun, Zihan | Yang, Wenqian | Wang, Huimin | Li, Xinmin

Article Type: Research Article

Abstract: Permanent magnet-assisted synchronous reluctance motor (PMSRM) has been widely used in many fields due to their advantages of less permanent magnets and low cost. However, the permanent magnet torque and reluctance torque of the traditional PMSRM reach their maximum values at different current angles. Therefore, the utilization ratio of the total torque to each torque component is low, which leads to the low power density of the PMSRM. To solve this problem, a new rotor structure suitable for PMSRM is proposed in this paper. The rotor can improve the total torque by increasing the maximum value of permanent magnet torque …and the utilization rate of total torque to each torque component. Thus, the power density of the motor is effectively improved. In order to realize the matching design of each parameter in the proposed rotor structure, the Taguchi method is used to optimize the design, and the influence of each optimization variable on torque and torque ripple is analyzed. The finite element simulation analysis method is used to establish the electromagnetic simulation model of the traditional structure, the new structure proposed and the optimized structure of the new structure by Maxwell simulation software. The simulation results show that the proposed new rotor structure not only effectively improves the torque density, but also effectively reduces the torque ripple. Show more

Keywords: PMSRM, power density, asymmetric rotor, finite element method, Taguchi method

DOI: 10.3233/JAE-220262

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-17, 2024

Authors: Lv, Pin | Wang, Kaixuan | Su, Xunwen | Zhai, Yuelin | Cheng, Lushuai | Wang, Haoming

Article Type: Addendum

DOI: 10.3233/JAE-249001

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-1, 2024