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In order to improve the structural performance of a five-axis gantry milling machine, a design idea of adopting parallel optimum design for key components and complete machine was investigated. Using CAE (Computer Aided Engineering) software, the finite element analysis model of the five-axis gantry milling machine key components and the complete machine were established. Then the static stiffness...
The design of piezoelectrically actuated plano-convex shaped resonators has been studied to optimize their Q-factor and signal spectrum at high temperatures. The investigated arrays of thickness-shear-mode (TSM) resonators consist of langasite, a high temperature stable material. As viscoelastic damping and an increasing conductivity decreases the Q-factor at elevated temperatures, design optimizations...
Three dimensional finite element model for solidly mounted film bulk acoustic resonator (SMFBAR) devices with 23?? c-axis-tilted ZnO film is developed and simulated using CoventorWare??. Electromechanical coupling coefficient for 23?? c-axis-tilted ZnO film calculated as high as 19% in quasi-shear mode. The particle vibration of the device at resonant frequency was measured in both quasi-shear and...
We theoretically investigate the thermally tunable photonic crystal fiber (PCF) coupler infiltrated with nematic liquid crystals. The thermo-optical responsive NLC offers thermal tunability of the fiber coupler. The proposed design can find promising sensor applications.
This paper studies multi-layered composite right-/left-handed transmission lines (ML CRLH TL). To realize wideband response from left-handed passband to right-hand passband without band gaps and other undesired parasitic resonances, a balanced ML CRLH TL with defected parallel plates is newly proposed and demonstrated theoretically by using FEM-based EM simulator. A wide passband from 2.0 GHz to 9...
Equivalent circuit parameters of doubly fed induction generator (DFIG) play an important role in the estimation of steady state and dynamic performance of wind turbine system. A new method based on magnetic field finite element analysis is proposed to improve the calculation of the DFIG parameters, especially the inductances. The magnetic field excited by the stator or rotor current is exactly divided...
This paper proposes a novel doubly salient machine. The topology of the machine is described. The flux within the air gap of the novel doubly salient machine is excited by both permanent magnets and field coils. The current of the field coils can be regulated to strengthen or weaken the flux level in the air gap. Therefore, the output voltage of the machine can be controlled easily. The method of...
This paper presents the operational principles, design and transient analysis of a new three-phase 12/14-pole doubly salient electrical magnet (DSEM) generator for its application in direct-driven wind power generation. Design equations, finite element and dynamic analysis of the new generator are described. The 12/14-pole DSEM generator with constant self-inductance has lower voltage ripple compared...
This paper presents the result of the two-dimensional finite element analysis on the effects of rotor pole arc variation and number of teeth per rotor pole with different teeth depths and stator excitation pattern on various performance parameters like cogging torque, developed torque, harmonic torques, torque ripple and phase inductance for an 6/8, three phase flux reversal motor. A novel excitation...
To increase the output dynamic response and decrease the stable ripple of VRM, With multi-core combination, a split-phase coupling array integration inductance (short for SCAII) is applied in the four-phase VRM. Without considering the impact of leakage magnetic flux, the effect of SCAIIpsilas parameters is analyzed on the performance of VRM. The SCAIIpsilas complanation structure, is given and using...
This paper presents a method for analyzing and optimizing electromagnetic susceptibility (EMS) of solid state relay (SSR) in the presence of incident wave. The model of SSR is built in Ansoft HFSS and analyzed by finite element method (FEM). The SSR is tested with electromagnetic interference (EMI) from different directions and the results show that the SSR is sensitive to the EMI whose electrical...
Switched reluctance motors are often running in status of two phases excited simultaneously. Mutual coupling has effects on not only the flux distribution and magnetic saturation, but also the ability of torque output. The two adjacent phases of switched reluctance motor can be excited in two modes, the long-flux-path mode and short-flux-path mode. The calculation method of mutual inductance in two-phase...
This paper investigates and compares the inductance evaluation methods for interior permanent magnet synchronous motors (IPMSM). Three major finite element methods will be discussed. First, their detail calculation processes are presented as well as their fundamental principles. Not only the results, but also their solving method, computation time and complexity are compared. Then, the discussion...
The electric energy supply is necessary for different moving systems. Classical energy transfer is realized by flexible cables or slip rings, which are usually becoming weakness or performance limitations of the system. The contactless inductively coupled power transfer is a kind of new power transfer technologies. The electromagnetic induction technique has been used to achieve wide range power transfer...
Discontinuous primary permanent magnet linear synchronous motor (DPPMLSM) has many merits in long-stroke transportation, including vertical, horizontal, and slanted model system, however, detent force of DPMLSM is particularly troublesome requiring positioning accuracy specially at low speed region as well as of position control and is different from short primary type and short secondary type PMLSM...
This paper presents a new procedure for coupling element-free Galerkin method with finite element method (FEM-EFGM). The coupling model is based on overlapping domain decomposition method (DDM), which the domain is decomposed into FEM subdomain and EFGM subdomain, then obtaining the iterative solutions by some techniques. The solutions are more accurate and could eliminate influence of irregular interface...
Method for 3D dynamic finite element analysis of electromagnetic problems involving movement was presented, in which the external circuits, nonlinear magnetic properties, eddy-current effects and movement are taken into account. In the method, the problem of voltage excitation problem was solved by the field-circuit directly coupled technique, and the 3D electromagnetic torque was calculated through...
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