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In order to design a contactless position sensor using coil impedance, the sensitivity and the linearity of impedance against the displacement are required. Therefore, it is very important to clarify the factors which affect the performance of position sensor. In this paper, the effects of winding density in coil on the sensitivity and impedance linearity are clarified by means of the experimental...
Electrical Machines are the devices which produce torque by the interaction of the stator and rotor flux linkages. To obtain the maximum torque, the winding current is usually controlled according to the waveforms of back-EMF. However, few papers study about how to design the stator winding and control the winding current according to the excitation flux linkage waveforms. If we focus on the excitation...
This presents a methodology to determine detail design directions of an 150kW-class IPMSM and its detail design. The basic design of the stator and rotor was conducted. After dividing the designed models into the best cases and the worst cases based on rotor shape parameters, Sensitivity Analysis and 3D Voltage-Inductance Map parameters were analyzed. Then, the design direction for the final model...
This paper presents a current sensor for current measurement in high frequency high voltage pulse power supplies, the output of which is DC current superposed with impulse current waveform. The current sensor is made of two magnetic cores. One works in fluxgate principle to measure DC current. While the other is based on transformer effects for impulse current measurement. The impulse current sensor...
The importance of numerical modelling and simulation by means of finite element analysis (FEA) has witnessed an increase as computational capability and software development have been substantially improved. These techniques can provide unique insight and aid detailed analysis of phenomena such as plasma arcs. In this digest, a two dimensional cold plasma chamber model has been simulated in a Multiphysics...
In this paper, a new breast cancer detection method that combines thermography and high frequency imaging techniques is presented. The proposed method uses the distribution and variation of the temperature on the breast surface in order to estimate the location and size of a breast malignant tissue (a cancerous tumor). First, breast tissue is excited with a printed dipole antenna array following which...
Charging time and power transfer efficiency are the main issues of wireless power transfer for electric vehicle. It is proposed in this paper to resolve both of the issues using the concept of transformer induction. An autonomous robot arm equipped with several sensors is mounted to the vehicles undercarriage to carry the receiving coil and locate it at the right place which is into the transmitting...
There is a developing enthusiasm for electric vehicle (EV) innovations as a result of their lower fuel utilization and greenhouse emission output. Integrating EV's with highway wireless power transfer (WPT) technology can conveniently reduce charging time and possibly expand their travel distance. There are several issues with the current WPT technology for electric vehicles: 1) low efficiency due...
This paper proposes an innovative hybrid multi-objective (MO), fast converging optimization algorithm, enabling global optimum tracking in permanent magnet traction motor design. The methodology developed is based on Artificial Bee Colony (ABC) technique, strength pareto evolutionary algorithm (SPEA2) and Differential Evolution (DE) strategy ensuring fast and reliable convergence to the optimal Pareto...
The near-field validation of the numerical models of portable wireless devices is becoming indispensable, especially, when checking SAR (specific absorption rate) compliance for regulatory limits by computer simulation. The current practice for such validation is to compare measured and simulated electromagnetic fields in a standard flat phantom. This paper proves that a cheaper and faster technique...
PEEC-based methodology appears very attractive for the analysis of fast voltage transients which may appear across and inside magnets in fusion devices in case of off-normal events. In this paper, we aim at illustrating how Adaptive Cross Approximation coupled with hierarchical matrix (H-matrix) arithmetics can provide an effective method to allow the solution of large scale problems typical of real...
This work is concerned with error control in the numerical approximation of magnetic fields. It is shown how linearization and discretization error can be balanced with respect to a desired numerical accuracy, reflecting an uncertainty in the solution. The uncertainty itself is roughly estimated using a gradient based worst-case approach. The different error measures are illustrated using a numerical...
In this paper the hybrid FEM-GDBCI (Finite Element Method — Galerkin Dirichlet Boundary Condition Iteration) method is described for the finite element solution of a variety of low-frequency electromagnetic field problems in open boundary domains. The method assumes a Dirichlet boundary condition on the truncation boundary and its imposition is made by means of a Galerkin integral equation over the...
An innovative method in reducing the electromagnetic interference of electric machine drives has been proposed in this paper. In this method, matrix converter with wide band gap switches is used for controlling the permanent magnet synchronous machine drive. This control system not only make the controlling smooth but also have the capability to reduce the electromagnetic interference, since the switching...
Based on a low-frequency stable formulation of Maxwell's equations, we propose a finite element and reduced basis scheme which allows for a robust and accurate evaluation of the system in any frequency. The approach considers in particular the limit cases, as the frequency tends to zero or to a maximal frequency for which a discretization is reasonable.
In the field of computational electromagnetics, taking into account the rotation of a sub-domain is required to simulate certain devices such as electrical machines. We propose a sliding surface method based on a spatial Fourier interpolation in order to take into account any rotation angle with a very simple numerical implementation.
Laminated busbars acquire significant importance even if they are a passive component in converters. Their flat and overlapped conducting layers allow good heat dissipation and reduced stray inductance. Topology optimization enables balancing the amount of copper used with the maximum temperature and stray inductance of the busbar.
To eliminate the inaccuracy of existing models and methods in predicting the transients of an insulated gate bipolar transistor in an arbitrary free-carrier injection condition, a coupled circuit-ambipolar diffusion equation model and its numerical solution methodology are proposed. The accuracy of the proposed model is validated by comparisons of the computed and tested results.
This paper deals with the losses caused by the welding to fix laminated cores of a traction motor. Although a number of studies have been performed on the motor design to increase the motor efficiency, there are few technical studies to implement the effect of manufacturing process, such as welding, on the motor design. However, the losses may have a significant effect on the motor performances. Thus,...
A well established firefly algorithm is improved in order to detect as many local solutions of a given objective function as possible with a minimum number of function calls. This is done by stressing the disposition of this algorithm to cluster the fireflies around good local solutions. This enhanced Firefly Algorithm will be applied for the optimal design of a disk type magneto-rheologic fluid clutch...
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