Papers by Keyword: EMF

Abstract: The paper considers the study of the electromagnetic force (EMF) of a synchronous generator based on the three-phase induction machine. The stand includes: a frequency converter, an induction motor, a synchronous generator, a three-phase rectifier, an active load resistance, power protection and inclusion industrial electrical network. The study provides an analytical solution to one of the main objectives within theoretical foundations of electrical engineering, formulated so to reflect the decision making while designing new types of synchronous generators with permanent magnets.

Abstract: The relation between the Electro Motive Force (EMF) and Total Harmonic Distortion (THD) was compared and verified by magnet arrangement. Using Halbach array, thrust was more increase by change of magnet arrangement. Moreover, the variable trend of cogging and THD by magnet ratio and magnet form change was checked.

Abstract: The aim of this work is a case study of the adaptation bilateral switched reluctance linear generator to the exploitation of energy of the sea. This type of generator can be used to convert wave energy in electrical energy. In this paper we present an analytical sizing and FEM simulation. As for the results, analysis of the data extracted through the simulations it was possible to calculate the emf. The emf was calculated in two cases of motion of the slider: first hypothesis has set the constant speed while the second is a variable speed according to the law of an oscillatory motion of the sea.

Abstract: Weight function is related with the sensor structure of electromagnetic flowmeter (EMF). Because of complex boundary conditions, it is difficult to solve the voltage differentiation equation of EMF directly to get weight function. The finite element numerical analysis method is tried to solve the weight function for the point and large-electrode EMF in this paper. The results prove it is feasible and efficient to obtain weight function of EMA by means of finite element numerical analysis.

Abstract: In this paper, modeling selects sensorless control of permanent magnet brushless DC motor in terms of work condition of submersible pump under water. Motor reduced by Hall sensor so that maintenance. Motor was controlled by state space and back EMF zero-crossing in Matlab/Simulink, and constitute total simulation system along with the other modules. Eventually, motor character was estimated in accordance with waveforms of simulation, which offers foundation for the design of actual motor control system.

Abstract: With the expansion of the scale of the communication network, the constant introduction of new business as well as the use of mobile network equipment from different hardware manufacturers, networks become larger and more complex, the device shows diversification, which makes the network management of the entire mobile communication network extremely complex. A complete set of advanced communications network management system to effectively manage a variety of physical devices and logical resources is particularly important. Based on TMN basic theory analysis of the network management function model, the intermediary function in the system model, unified network management system and the corresponding communication network equipment interoperable access interface, so that the whole network management system functional hierarchy is more clear, easy implementation of network management business module; the system based on the framework enables unified NMS network element management, network management can be independent of the specific equipment to avoid the R & D work duplication of each managed device interface and improve the development efficiency as well as the maintainability and scalability of the system, which laid the foundation for the provision of integrated access and reference for the design and development of next-generation telecommunications network management.

Abstract: The weight function method that uses a known weight function has been a general tool for the signal analysis of the electromagnetic flowmeter(EMF). However, it is difficult to solve the voltage equation directly by analytical method in order to get weight function for the partially filled pipe electromagnetic flowmeter(EMF-PF). The finite element numerical analysis method is tried to solve the weight function for the EMF-PF in this paper. The results show that weight function for EMF-PF relates to fill height of liquid in partially filled pipes, and there is a nonlinear function relationship between weight function for EMF-PF and fullness degree of liquid in the pipe.

Abstract: This paper describes Freescale company’s DSP device MC56F8013 implementation of a control method for sensorless BLDC motor, which is according to fuzzy neural network. The inductance of stator core varies according to the variation of rotor position, and the rotor position can be estimated with the variation of current response caused by six direction voltage vectors. Then use fuzzy neural network PI control method to optimize the dynamic performance, accelerate the rotor to a certain speed, and switch to EMF mode. The experiment results show that the proposed method can have fast response, strong robustness and superior performances.

Abstract: A series of Al-Si hypoeutectic alloy ingots were prepared by centrifugal casting (CC) both with and without an external electromagnetic field (EMF). The effects the EMF on grain refinement and on the solidification mechanism during centrifugal casting have been investigated using optical microscopy, scanning electron microscopy (SEM) and electron backscattering diffraction (EBSD) orientation measurements. The electromagnetic stirring effect caused by the EMF promotes the columnar-equiaxed transition (CET) resulting in a finer cast grain size. The silicon and aluminum nucleate and grow independently both with and without EMF