International Journal of Applied Electromagnetics and Mechanics - Volume 73, issue 3

Authors: Li, Xinmin | Li, Feilong | Hung, Wing San Tony | Qiu, Zhengjie | Wu, Yonglong | Zhang, Runzhi

Article Type: Research Article

Abstract: Magnetic gears have attracted the attention of many scholars due to their advantages of low noise, maintenance free, high torque density and inherent overload protection. In this paper, three speed regulation methods of high power magnetic gear transmission system are summarized and proposed, and the finite element analysis of the three speed regulation methods is carried out by COMSOL Multiphysics simulation software. The results show that when the sizes of the three magnetic gears are similar, the output torque and load power of the speed regulation method of the magnetic gear using the magnetic field modulated type is the largest. …On the contrary, the axial magnetic gear with air gap length regulation method has the lowest output torque and load capacity. Compared with the other two methods, the coupling length regulation method has the minimum eddy current loss and the simple speed regulation structure, which is the most suitable for high power magnetic gear. Show more

Keywords: Magnetic gear, speed regulation method, torque, power, finite element analysis

DOI: 10.3233/JAE-230046

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 73, no. 3, pp. 153-174, 2023

Authors: Pang, Yuyi | Yu, Haitao | Wang, Yao | Che, Zhiyuan | Ali, Murad | Ye, Zhicheng

Article Type: Research Article

Abstract: A novel control strategy based on finite time control and super-twisting observer is proposed to improve the control performance and robustness for permanent magnet synchronous linear motor (PMSLM) drive system. First of all, the velocity-current single loop control which called non-cascade structure control is proposed by the finite time control, then the response velocity of the PMSLM drive system can be improved. Secondly, to improve the disturbance rejection performance, a super-twisting observer is designed to feedforward the load. Furthermore, the strictly convergence of the proposed control strategy is implemented. Finally, comparative simulations and experiments are designed on PI control, sliding …mode control, and the proposed control method. Results demonstrate that the proposed method has better robustness and control performance. Show more

Keywords: Permanent magnet synchronous linear motor, non-cascaded structure, finite-time control, super-twisting observer

DOI: 10.3233/JAE-220200

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 73, no. 3, pp. 175-190, 2023

Authors: Guo, Benzhen | Li, Desheng | Tian, Jinshan | Ye, Lezhi | Wang, Bin | Li, Zequn

Article Type: Research Article

Abstract: In this article, a clear and concise analytical method for predicting the performance of a Liquid-cooling eddy current brake (LC-ECB) is proposed. The LC-ECB has a coolant channel in the rotor to allow direct cooling of the inner surface of the stator. The static air-gap magnetic field distribution is obtained by the dynamic magnetic equivalent circuit (MEC) method, and the magnetic flux leakage and global magnetic saturation effects are fully considered. The magnetic field intensity distribution function of the eddy current reaction magnetic field is derived for the first time based on Ampere circuital theorem. Considering the local magnetic saturation …and skin effect, a novel double-iteration algorithm based on the conservation principle of magnetic pressure drop is applied to obtain the transient air-gap flux density distribution, and then the brake torque expression is obtained. The finite element method (FEM) and experimental results show that the proposed method is feasible and effective. The new model is easy to program and can be easily used in the initial design and optimization of LC-ECB. Show more

Keywords: Eddy current brake, magnetic equivalent circuit, magnetic field distribution, magnetic saturation, skin effect

DOI: 10.3233/JAE-220246

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 73, no. 3, pp. 191-211, 2023

Authors: Alvarez-Flores, Jose L. | Vera-Reveles, Gustavo | Castillo-Soria, Francisco R. | Soriano-Equigua, Leonel | Maciel-Barboza, F.M. | Alcaraz-Valencia, Pablo A. | Cardenas-Juarez, Marco | Hernandez-Gomez, E.S. | Simon, Jorge

Article Type: Research Article

Abstract: The knowledge of dielectric properties of organic materials at microwave frequencies is important for different applications in agriculture, food, or other similar research areas. The method of the low-cost disturbed cylindrical cavity resonator is a common measurement technique that considers resonant frequency shift when inserting samples of materials inside the cavity. Frequency shifts together with the knowledge of the complex permittivity of a reference material allow the estimation of the permittivity of a material under test. In this paper, the complex permittivity, and the loss tangent of dried and powdered agricultural wastes from the state of Colima in Mexico are …obtained at 1.2853. The materials under test are coir and skins of rice, banana, lemon, watermelon, pineapple, and papaya since they are one of the most abundant agricultural wastes in the state of Colima in Mexico. Show more

Keywords: Colima, complex permittivity, disturbed cylindrical cavity resonator, Mexico, microwave frequencies, powdered agricultural waste products

DOI: 10.3233/JAE-230027

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 73, no. 3, pp. 213-223, 2023

Authors: Wu, Rui | Lin, Jianhong | Cai, Shuting

Article Type: Research Article

Abstract: A multi-mode wideband antenna based on multi-mode resonator is proposed with stable radiation patterns, which is composed of metal radiators, parasitic resonators, shorted patches fed by the U-shaped feedline, and a box-shaped reflector. A prototype of the proposed antenna is designed, fabricated, and tested. Measured results show that the antenna achieves an impedance bandwidth of 37.5% (0.67–0.98 GHz) for |S 11 | < −15 dB, a half-power beam width (HPBW) of 67.5 ± 2.4 degree at H-plane (horizontal plane), and a gain of 8.0 ± 0.5 dBi. Furthermore, the cross-polarization discrimination (XPD) is more than 15 dB at 0 degrees …and at least 11.2 dB within ±60 degrees at H-plane, respectively. The proposed antenna can be used in the modern communication systems for LTE700/GSM850/GSM900. Show more

Keywords: Multi-mode resonator, wideband, stable radiation pattern, LTE700/GSM850/GSM900

DOI: 10.3233/JAE-230116

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 73, no. 3, pp. 225-234, 2023