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This paper describes the importance of residual magnetism in the stator of a brushless exciter used in a self-starting alternator set. It then shows how a pragmatic hysteresis model within finite element simulations of the exciter can be used to optimize the material properties required to obtain the maximum residual exciter armature voltage, while also minimizing the losses associated with using...
This paper presents an unconventional flat-type linear permanent magnetic generator based energy harvesting system which employs a cascaded boost-buck two-stage converter, with a maximum power control algorithm optimized for low frequency human horizontal foot motion, for Li-Ion battery charging. The dynamic model of the linear generator is built and the analytical equations for maximum power generation...
This paper presents a new dual-stator doubly salient brushless DC generator (DSBLDCG). The key of the proposed generator is to reduce the voltage and torque ripples. Finite element analysis (FEA) of the generator is carried out to investigate the magnetic field distribution at different rotor positions. Furthermore, flux-linkage and inductance characteristics are also given. The simulation of the...
This paper proposes and implements a new 24/16-pole hybrid excitation doubly salient brushless DC generator(HEDS-BLDCG) with dual terminal output. Configuration and flux control principle of the generator are presented. Two-dimensional finite element analyses(2D-FEA) are made to investigate the static field distribution characteristics of this new type of generator. Field-circuit coupled analysis...
This paper presents the design and analysis of a direct-coupled radial-flux permanent magnet generator (PMG) for wind turbine applications. The analysis of the design was carried out using finite-element analysis (FEA). The design data is used in optimizing the configuration and magnetic flux density of the PMG. For evaluating the performance of the proposed PMG, the prototype generator is implemented...
High-speed permanent magnetic generator (HSPMG) is a common and important power generation equipment in distributed generation systems. In this paper, a 100kW level HSPMG is studied, and the transient 2-D electromagnetic field is analyzed by using FEA, from which losses distributions (heat sources), especially eddy loss in rotor sleeve in machines are determined. Then, the 3-D thermal field is calculated,...
This paper deals with the characteristic analysis of the integrated power system applied for the electric propulsion ships. This includes the electric power system modeling which is accomplished with the electric power network mainly composed of generators, switchboards, variable frequency devices, electric motors, and etc. In addition, performance comparison between the permanent magnet synchronous...
This paper presents a fault detection system based on multilayer feedforward artificial neural network (ANN) for detection of one or several broken parallel coils of a small generator. This fault type cannot visibly influence on machinepsilas normal performance and since the performance of a faulty machine with broken coils is similar to that of a healthy one with unbalance load, therefore detection...
The paper presents a single phase, slotless axial flux permanent magnet synchronous machine for induction heating gen sets. A full scale prototype of the machine (110 kVA, 400 Hz, 690 A) has been designed and subsequently analyzed through FEM analysis (FEA). Induced current distributions in the permanent magnets (PMs) and in the rotors are also calculated through FEA and it is seen that the resulting...
In full hybrid electrical vehicles, two separate electric machines and two power inverters are required. One machine operates as a generator and the other works both as a generator and motor. The two electric machines are connected to an intelligent gearbox called planetary gear set together with engine. In this paper, a new machine - dual mechanical port (DMP) machine is proposed, which combines...
The stator of the linear magnetic flux compression generator (LMFCG) consists of a helical coil, epoxy (insulator) and a casing, of which the helical coil is the key part. In order to grasp the detailed state about the helical coil under the impact of pulsed current, a 3D solid model of the helical coil was set up and the magnetic-structural coupling analysis of coil was carried out. Some useful conclusions...
Analytical calculus and computational models of multiphysics problems were used in order to solve an overheating problem and simultaneously increasing reactive power in a generator group of a hydroelectric power plant (HPP). All of them present the same geometrical, mechanical and electromagnetic characteristics. A method of iteration using finite elements analysis (FEA) called simplified virtual...
The design of 2-dimensional equivalent model for claw-pole type generator is presented in this paper. On the basis of 3D geometry, 2D equivalent model is designed and 2D FEA is performed. Comparing to other analysis method for claw-pole type machine, such as 3D FEA and MEC, presented method can be more practically used and directly applied to industry. Flux distribution in the air-gap and flux density...
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