International Journal of Applied Electromagnetics and Mechanics - Volume 55, issue 2

Authors: Wang, Shuaibing | Li, Lin | Zhao, Xiaojun | Xie, Yuqing

Article Type: Research Article

Abstract: The special hysteresis characteristics of the laminated core (LC) under DC bias are analyzed and the hysteresis loops are simulated by the hysteresis model based on consuming function. The field-circuit coupled time-periodic FEM (TPFEM) combined with the locally convergent fixed-point method is presented to calculate the excitation current and magnetic field of LC under DC bias. A method by increasing the resistance and setting up a compensation voltage artificially is proposed in this paper, which can solve the stability problems caused by the lack of convergence of solutions when the DC-biased condition becomes more serious. Besides, the excitation current of …LC with no-load and different loads under DC bias is analyzed based on the field-circuit coupled fixed-point TPFEM. Show more

Keywords: Hysteresis, time-periodic FEM, DC bias, fixed-point, voltage compensation

DOI: 10.3233/JAE-170056

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 55, no. 2, pp. 289-300, 2017

Authors: Rehman, Obaid Ur | Yang, Shiyou | Khan, Shafiullah

Article Type: Research Article

Abstract: The expansion of global optimum methods for electromagnetic design optimization has been successful in the last few years. However, there is no any universal algorithm to be equally successful for all engineering inverse problems. In this regard, inspired from the classical particle swarm optimization (PSO) method and quantum mechanics, this paper presents an improved quantum particle swarm optimizer (MQPSO) by using a tournament selection strategy. Also, a new index, called the torment best (tbest ), is incorporated into the QPSO to further enrich its performance. In addition, a new parameter updating strategy is proposed to tradeoff between the exploration and …exploitation searches. The feasibility and merit of the proposed approach are verified by the numerical results on mathematic test functions and an electromagnetic inverse problem, namely the TEAM workshop problem 22. Show more

Keywords: Global optimization, electromagnetic design problem, particle swarm optimization, quantum mechanics

DOI: 10.3233/JAE-170055

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 55, no. 2, pp. 301-311, 2017

Authors: Wang, Zhiyong | Guo, Fengyi | Yan, Xiaoming | Wang, Dan | Wang, Meng | Chen, Zhonghua

Article Type: Research Article

Abstract: With the continuous increase of electric locomotive running speed, pantograph arc occurs more and more frequently. The conducted electromagnetic noise caused by pantograph arc will effect seriously normal operation of on-board equipment. With the self-developed electromagnetic noise experimental system, eighty-six groups of conducted electromagnetic noise experiments under different sliding speed, contact pressure, contact current conditions were carried out with single-factor experimental method. Total harmonic distortion (THD) of contact current was proposed and used to reflect the interference level of the conducted electromagnetic noise. The effect of sliding speed, contact pressure and contact current on THD was analyzed. A regression model …of the conducted electromagnetic noise was established by using support vector machine (SVM). The independent variable of the model are sliding speed, contact pressure and contact current. The dependent variable of the model is THD. The model parameters were optimized by using particle swarm optimization algorithm. The effectiveness of the regression model was verified with experimental results. It can be used to further understand and forecast the conducted electromagnetic noise. Show more

Keywords: Pantograph arc, electromagnetic noise, total harmonic distortion, sliding electrical contact, SVM

DOI: 10.3233/JAE-170036

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 55, no. 2, pp. 313-327, 2017

Authors: Qian, Junbing | Yuan, Ruibo | Bao, Liping | Yang, Xiaojing

Article Type: Research Article

Abstract: In a precision active isolator, Lorentz motors (LM), a permanent magnet linear synchronous motor (PMLSM), often are used as an actuator. As a key equipment, the performance of the precision active isolator is directly affected by the LM. In the design of LM, many factors must be considered, a comprehensive analysis including active isolation system, structural dynamics, magnetic field and cooling, should be integrated to optimize a LM. First, a dynamical model about an active isolator is built. A measurement method of eccentricity in the precision active isolator is presented for the LMs. A simple decoupling magnetic equivalent circuit (MEC) …is proposed to predict MFD distribution of the air-gap in the design of LM, and an water cooling system is presented and analysed. Finally, an optimization combining effective cost function is used to find the optimal motor dimensions. The performance of the optimized LM is described by simulation and experimental results, which also confirm effectiveness of the optimized design. Show more

Keywords: Active isolator, lorentz motor, optimal design, water cooling, decoupling magnetic equivalent circuit

DOI: 10.3233/JAE-160076

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 55, no. 2, pp. 329-341, 2017