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). · 0.73 Impact Factor
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ABSTRACT: Some types of bearingless switched reluctance motors (BSRMs) have been developed up to now. Their differences mainly focus on different stator-rotor tooth number and winding structures: two layers of windings and single layer of windings for 12/8 or 8/6 BSRM. Their driving principles are just the same: driving current and radial force current are regulated to generate torque and radial force separately. The main difference is the loading of two currents on one single layer of windings or on two separate layers of windings. Further analysis proves that single layer winding structure has more advantages, for example simpler motor and winding structure. Based on the above researches, one 8/6 BSRM with simpler single layer of winding structure has been developed furthermore. Its main characteristic is that the total winding number of motor is decreased from eight to six, which is only two more than four windings of a normal 8/6 SRM. Only six converters are demanded to achieve levitation operation. Its special driving theory and speed regulation technique of the motor by applying three phase windings have been introduced. To testify the new idea, theoretical analysis and practical test have been finished for one test motor. One initial speed of 5000 r/min of levitation operation has been achieved.IEEE Transactions on Industrial Electronics 06/2012; 59(6):2592-2600. · 6.50 Impact Factor
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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