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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- "So far, there are mainly two kinds of methods to work it out. One is that the additional set of conditional windings is wound on the stator core with the main windings    . It needs two sets of inverters to supply the currents to the torque-and suspension-winding respectively. "
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). DOI:10.5370/JEET.2014.9.1.162 · 0.52 Impact Factor
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ABSTRACT: This work has been made to achieve two goals. The first is to introduce a reliable operation by determining the least inductance of windings to start the motor from an unaligned position, based on three-pulse injection to the motor windings. The second is to enhance the performance of the whole system. This is done by vibration and harmonic reduction based on the delay angle between firing sequence pulses train. This work implements accurate rotor position estimation, which is very important for the performance operation of the switched reluctance motor. The key principle of the rotor position estimation is based on detecting and comparing of phase voltage and current responses relating to the stator inductance varied with the position of the rotor pole (maximum inductance when it is aligned and minimum inductance when it is unaligned). Experimental results are presented to verify the proposed method.ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 10/2013; 38(10). DOI:10.1007/s13369-013-0596-z · 0.37 Impact Factor
Conference Paper: Study on Switched Reluctance Generator for Rural Electrification[Show abstract] [Hide abstract]
ABSTRACT: This paper addresses the need for the utilization of cost effective, maintenance free electric machines in stand alone wind energy conversion system meant for rural areas. The suitability of switched reluctance machine as generator for stand alone rural wind energy conversion system has been explored through design and analysis. The design procedure, selection of pertinent topology, static and transient magnetic characteristics has been presented. Finite element analysis has been extensively used to refine as well as to analyze the finalized design.Industrial and Information Systems (ICIIS), 2009 International Conference on; 01/2010