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An improvement equivalent circuit method (ECM) for analyzing finite and curved frequency selection surface (FSS) is proposed in this paper, double-square-loop FSS has been used in the curved FSS and the transmission coefficients of both TE and TM models have been analyzed by the ECM and full wave method. It has been shown that the improvement ECM has saved computational time in designing curved FSS,...
This paper presents an approach to the high power density design of high-current DC-DC converters which bears high transient load power. The transient thermal design of semiconductors to obtain the minimum cooling medium volume is proposed. Optimal dimensional design of the low-profile nanocrystalline transformer is also highlighted for achieving the minimized transformer loss in the steady state...
In order to comprehensively understand magnetic field distribution in soft magnetic composite (SMC) materials which apply to three-dimensional (3-D) flux electrical machine design, 3-D reluctivity tensor should be taken into account. A 3-D magnetic properties testing system fitting for cubic SMC sample has been constructed and calibrated by means of finite element method (FEM). According to the experimental...
This paper investigates the nonlinear model of the permanent magnet synchronous machines (PMSMs). In order to incorporate the structural and saturation saliencies, two parameters are defined to indicate the saturation ratios. An analytical model is derived and the inductance matrix is expressed in both stationary and rotating reference frames, respectively. An incremental inductance measure system...
In this paper a comprehensive magnetic model is developed for a surface mounted permanent magnet synchronous machine (SPMSM) considering both the structural and the saturation saliencies to enable the numerical simulation of new rotor position detection algorithms. With an identifiable parameter matrix, a numerical nonlinear inductance model is proposed, in which the rotor position and the stator...
Soft magnetic composite (SMC) materials are widely applied in three-dimensional (3-D) magnetic flux electrical machines. Conventional methods for analyzing the magnetic properties of SMC materials based on alternating excitation are not comprehensive due to the rotational magnetic properties in the rotating electrical machines. In order to completely understand and model the magnetization process...
This paper presents an analysis and optimal design of a capacitor-driven inductive coilgun. The electromagnetic FEA model of the capacitor-driven inductance coilgun is established and simulated by using Ansoft. In order to speed up the optimization, an equivalent circuit is designed for simulation of the performances of coilgun. A piece-wise model of projectile is built to account for the eddy current...
This paper presents the development of a permanent magnet motor with soft magnetic composite (SMC) stator core for driving a dishwasher pump. The unique properties of the SMC, such as 3D magnetic isotropy and molding production technique, have been taken into account in the design. 3D magnetic field finite element analysis is carried out to accurately compute the motor parameters and an equivalent...
Research on the wireless passive surface acoustic wave (SAW) impedance-loaded sensors has received significant attention in recent years. This paper concentrates on the simulation method of these sensors. In our previous work, the coupling-of-modes (COM) model of impedance-loaded SAW sensors was constructed based on the models of SAW IDT. The accuracy of this model depends on the accuracy of their...
In this paper, a software package of finite element (FE) analysis for induction machines is presented. The back-EMF in windings is expressed by magnetic vector potential, which is used to couple with transient finite element analysis. The equations of drive circuit and rotor bars are described by loop circuit equations. The pre-processing and post-processing of this package are developed based on...
In this paper, the thermal performance of a heater on membrane was analyzed from a ring heater by a conventional simplified model. Some preliminary principles of the structure design are concluded for heaters working in vacuum or in atmosphere. According to the principles, an optimized heater structure is demonstrated, and the coupled thermal-electrical finite element method (ANSYS) is employed to...
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