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This paper presents the design and analysis of a novel machine family of Slotless Permanent Magnet Brushless DC motors (PMBLDC) for precise positioning applications of spacecrafts. Initial design, selection of major parameters and air gap magnetic flux density are estimated using the analytical model of the machine. The proportion of the Halbach array in the machine was optimized using FE to obtain...
When a place catches fire it is well observed fact that a large amount of time is wasted by the fire man to extinguish fire due to huge distance present between the place of the fire and the water hose or water monitor. Because of which large amount of water is wasted due to evaporation of water loss during jet impact. It is impossible to take water monitor close to fire because of high temperature...
This paper will describe how finite element analysis can be utilize to design and model the performance of rotary electrical machines. Special interest placed on the induction motor since the design is simple, and has greatest influence in operation of electrical power system. Transient AC analysis has been studied as it is necessary to examine the motor's performance dynamically. Opera 2D software...
In this paper, we investigate the effect of the reset-pulse parameters of a phase-change memory line cell on the electrical cell properties. By means of electrothermal finite-element simulations and measurements, the characteristics of the reset state (resistance after switching, threshold voltage, and stability of the state) are related to the physical parameters during reset switching (the temporal...
The eddy loss of stator windings in synchronous generator was calculated using analysis method and finite-element method, the distributed characteristic of stator windings temperature field was studied. In this paper, the distribution characteristic of eddy current of windings in rectangular slot was analyzed first by using analytical method, and the mathematical representations of eddy current were...
This paper uses multi-conductor transmission line (MTL) to model transformer windings. According to the symmetry of windings, a 2D equivalent finite element model can be set up under ANSYS environment. On the basis, finite element method (FEM) is used to calculate the distributed parameters in transformer windings. In the process of calculation, the skin effect is focused on. The frequency-dependent...
A method for calculating the performance of double-sided linear induction motor (DLIM) with short secondary is presented in this paper. The analytical solution of air gap flux density is firstly deduced from one-dimensional (1-D) electromagnetic field equations, then in the equivalent circuit of the motor, to take both longitudinal and transverse end effects into account, the correction coefficients...
A new approach employing the circuit analysis theory instead of electromagnetic field theory is presented to calculate the rotor resistances and inductances of single-phase induction motors. The resistance and inductance parameters are obtained at positive sequence and negative sequence frequencies, respectively, with skin effect consideration. The rotor bar is divided into many thin-layers with their...
The skin effect of rotor current is one of key factors which affect the simulation accuracy of three-phase induction motors with deep rotor bars. This paper proposes an improved dynamic model considering the skin effect of three-phase induction motors at arbitrary operation, from the starting to rated-load operation. The simulation results using the proposed model are compared with those from the...
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