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This paper presents a 3-D analytical magnetic field analysis of an air-cored axial flux permanent-magnet machine The 3-D analytical magnetic distribution is established using the magnetic scalar potential and modified BESSEL functions in the cylindrical coordinate system. The analytical magnetic field distributions and electromagnetic force are derived and verified by the computational results using...
This paper presents a novel dual-stator hybrid excited synchronous wind generator (DSHESG). The structure characteristics are presented and no-load magnetic field is computed by 3-D finite element method. Static characteristics including magnetic flux density, EMF, inductances are analyzed. A closed-loop control system for field windings using PWM method is built on the basis of mathematical model...
Permanent magnet actuator has such advantages as free-maintenance and high reliability. In this paper, a new type of permanent magnet actuator used for lower voltage circuit breaker is analyzed based on 3-D finite element method. Typical flux density distributions are computed with different currents. Two control strategies, open-loop control and closed-loop control, for the permanent magnet actuator...
The structure and operation principle of a novel hybrid excitation claw-pole synchronous machine (HECSM) are introduced. The field-control capability based on the equivalent magnetic circuit method is analyzed. A 3D finite element analysis (FEA) is used to analyze no-load magnetic field distributions, air-gap flux, phase flux linkage and back EMF variation for different field currents. Furthermore,...
SF6 gas insulated transformer (GIT) has the advantages of nonflammable and non-explosive. However, there is a deviation in flows near the coils, which results the coil temperature overheat. In order to remove the deviation of flow, it is necessary to use force-directed-gas duct cooling system. In this paper, the force-directed-gas duct heat fluid coupled finite element method is presented based on...
Alternating current (AC) permanent magnet (PM) contactor is a new type of contactor, which coil does not consume energy during its working course. This paper proposes a new structure contactor and analyzes magnet field distributions of PM arrangements both on stator and on armature based on finite element method. The computed results of two arrangements are almost the same for making course, but for...
A novel dual-stator hybrid excited synchronous claw-pole generator (DSHESG) is proposed in this paper. The structure characteristics are described and the operation principle is introduced. Using finite element method, the field-control capability of DSHESG is studied. Some static characteristics including air gap flux density, no-load flux linkage, back-EMF, self-inductance of field windings, and...
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