Electromagnetic Analytical Methods Research Articles

Electromagnetic Performance Analysis of Wind Power Generator With Outer Permanent Magnet Rotor Based on Turbine Characteristics Variation Over Nominal Wind Speed

In this paper, we investigate the electromagnetic performance of wind power generators with outer permanent magnet rotors on the bases of variations in the turbine characteristics over nominal wind speeds by employing various proposed analytical techniques. We have employed an electromagnetic analytical method for calculating electrical parameters such as back EMF constant, synchronous inductance, and phase resistance on the basis of the magnetic field distribution calculated in previous studies. Moreover, curve fitting and finite element methods have been used for core losses analysis, while the d-q model employing the coordinate transformation theorem has been used for analyzing generation performances. To validate our techniques, we compared the performance results obtained using our analytical methods with those obtained by experimental setups. In addition, we propose optimized wind turbine characteristics for our model from the analysis results of electromagnetic performances obtained by considering three types of turbine characteristics.

Analysis on Dynamic Characteristic and Circuit Parameter of Linear Switched Reluctance Motor by Electromagnetic Analytical Method

This paper deals with analysis on dynamic characteristic and circuit parameter of linear switched reluctance motor by electromagnetic analytical method. Above all, using space harmonic method, which is electromagnetic method, the air-gap flux density is analyzed in the both align and unaign positions, and the inductance profile, force characteristic and resistance per phase are calculated by means of the process. The validity of the analyzed results are demonstrated by the finite element method(FEM) and manufacture of the prototype machine. Second, the dynamic simulation is analyzed by the use of circuit parameters derived from analytical method, and the operating system of the prototype machine is manufactured to demonstrated the validity of simulation analysis. As a result, it is considered that the characteristic equation suggested in this paper will contribute to the design, analysis and application of LSRM.

Characteristics in the State of Motion of Induction Type Two-Dimensional Drive Motor

We have proposed the “surface induction motor” which is an induction type of two-dimensional motion motor with a circular shaped primary core. The primary member is composed of a toroidal core and the armature winding of separated coils for each current supply. The secondary member is a conducting plate with a back iron plate. As it can make a flexible traveling field in any region on the circle, the motor enables an arbitrary directional planar drive including a rotation. We have reported the characteristics at standstill so far. This paper presents the characteristics at movement. The slip and speed characteristics for the rotating motion and the linear motion respectively are cleared experimentally and theoretically. For the analysis, the two-dimensional electromagnetic analytical method is used, in which the direction of circumference of the toroidal core is transformed to the direction of x-axis. In linear motion, the traveling fields in both sides for the moving direction are made along the semicircle. To study theoretically about the slip characteristics of linear movement for the speed of traveling field, we propose the polygon model with linear motors arranged along the semicircle. The validity of the analysis is proved by experimental results. It is cleared that the equivalent synchronous speed in the moving direction for the traveling field speed is 0.884, By comparing with the two linear motors configuration for two-dimensional drive, the advantage of surface induction motor is shown.