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This paper investigates a three-phase 12/8 poles bearingless doubly salient permanent magnet machine (BDSPMM) with suspending windings, armature windings and PMs on the stator. Based on the topology and operating principle, the influence of PM magnetization length on the performance of the BDSPMM is analyzed and a mathematical model of radial suspending force is deduced from the magnetic circuit....
The measured electromagnetic resistivity from the logging-while-drilling (LWD) tool is affected by mud-filtrate invasion. An inversion method is carried out to obtain accurate formation resistivity, resistivity of flushed zone, and invasion depth. We studied the invasion pattern of mud-filtrate based on the data of inversion. We observed that the invasion depth can be expressed as a function of parameters...
The posture of the laser head is requested strictly in the cutting along the intersecting line of laser processing robot, and the position model of intersecting line is complex. In order to meet these demands, a continuous trajectory planning method which is used to controlling the position and posture of laser head is proposed. For the normal direction of the surface keeping coaxial to the laser...
A computer-PLC (Programmable Logic Controller) control solution was proposed for the artificial trough rainfall simulator. The rainfall process with continuous changing intensities was simulated automatically with the control strategy. Frequency-tunable pulse signal of specified duty ratio was generated precisely using pulse module of PLC to drive nozzles oscillating at required frequency. Thus, arbitrary...
The Intelligent control methods are drawing great attentions due to their strong adaptive ability and learning ability. Because of strongly nonlinear magnetic characteristics of switched reluctance motor(SRM), modeling of the torque characteristics is difficult. In this paper, the new torque modeling approach based on artificial neural network(ANN) is investigated, where the training data are obtained...
Accurate modeling of flux-linkage characteristics is the basis of design and control of switched reluctance motor (SRM). The flux-linkage characteristic of SRM is a function of both the excitation current and rotor position. But due to the highly nonlinear characteristics of SRM, modeling is cumbersome. In this paper, three effective algorithms for modeling of SRM are investigated, which are based...
Accurate calculation of the flux linkage characteristics is the basis of design and control of bearingless switched reluctance motor (BSRM). In this paper, flux linkage of main-and suspended windings for a BSRM were calculated by using 3D finite element method (FEM). A new subregional fitting algorithm was proposed and a novel mathematical model of flux linkage was built by using Fourier series and...
This paper presents a method of optimizing number of turns of the main and radial force winding for a bearingless switched reluctance motor (BSRM) with 12/8 teeth configuration based on its mathematical model. The radial force and torque of BSRM are analyzed on condition of different combinations of the magnetomotive force of two kinds of windings. The winding configuration has a strongly influence...
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