A Full-Period Generating Mode for Bearingless Switched Reluctance Generators
ABSTRACT A bearingless switched reluctance generator (BSRG) is developed, which is operated in full-period generating mode. In the proposed 12/8 bearingless generator, two sets of windings are embedded in the stator. The coils of excitation winding wound on each stator pole are separately controlled, whereas the coils of generation winding are connected in series for each phase. To begin with, the voltage equations of the generator are built for the dynamic analysis model. Then, the mathematical model of radial force is derived for the control of the unbalanced magnetic force. Furthermore, a control algorithm is introduced to generate the required radial forces and output voltage. Finally, dynamic analysis results are included to verify the proposed analysis.
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ABSTRACT: The analysis and comparation of the half-coiled short-pitch windings with different phase belt are presented in the paper. The half-coiled short-pitch windings can supply the odd and even harmonics simultaneously, which can be applied in multiphase bearingless motor (MBLM). The space harmonic distribution of the half-coiled short-pitch windings with two kinds of phase belt is studied wi th respect to different coil pitch, and the suitable coil pitch can be selected from the analysis results to reduce the additional radial force and torque pulse. The two kinds of half-coiled short-pitch windings are applied to the five- and six-phase bearingless motor, and the comparation from the Finite Element Method (FEM) results shows that the winding with phase belt is fit for the five phase bearingless motor and the winding with phase belt is suitable for the six phase bearingless motor. Finally, a five phase surface-mounted permanent magnet (PM) bearingless motor is built and the experimental results are presented to verify the validity and feasibility of the analysis. The results presented in this paper will give useful guidelines for design optimization of the MBLM.Journal of Electrical Engineering and Technology 01/2014; 9(1). · 0.52 Impact Factor
Conference Paper: A novel converter to enhance SRG performance[Show abstract] [Hide abstract]
ABSTRACT: This paper presents a novel approach to increase the excitation flux in magnetizing state and prolong stored energy discharge in a Switched Reluctance Generator (SRG). This purpose is achieved by using a multi-winding SRG in which the coils in every phase can be paralleled in magnetization period and then shift to series connection in demagnetizing time. It's demonstrated that faster phase charging and more ideal generating function is achievable. Reconfiguration from parallel to series and vice versa is accomplished by a new Parallel to Series Converter (PSC). This accomplishment is first proved theoretically, and then through Finite Element (FE), the simulation of this model is developed. Finally, comparing the conventional asymmetric bridge with the proposed converter, its significant advantages are analyzed. Applying the new converter, excitation current reaches to about nine times higher than the Conventional Series Converter (CSC), and demagnetizing period lasts about three times longer than Conventional Parallel Converter (CPC).2014 5th Power Electronics, Drive Systems & Technologies Conference (PEDSTC); 02/2014
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ABSTRACT: This paper investigates a new converter circuit for a three windings per phase, 6 by 4 switched reluctance generator. This converter utilizes forward topology for the generator converter circuit. The switched reluctance generator and energy conversation are described in this paper. Simulation results are presented finally. This converter output voltage is compared with conventional bifilar converter output voltage.Power Electronics, Drive Systems and Technologies Conference (PEDSTC), 2013 4th; 01/2013