Abstract
In this paper, a sensorless position detection method of a two-phase switched reluctance motor (SRM) at standstill is proposed based on the voltage pulse injection method. Due to the torque dead zone and the lack of starting capability in the two-phase SRM, a rotor with a stepped structure is adopted to ensure continuous torque generation. The inductance characteristics of the asymmetric SRM are analyzed, and the region of the rotor position is categorized into linear regions and nonlinear regions with several key rotor positions and threshold values of self-inductance. A simple analytical model of the phase self-inductance profile of the asymmetric rotor SRM is proposed, which only requires a few linear equations, to replace the conventional look-up table. A pulse injection-based position estimation method is proposed based on the aforementioned analytical model. Short voltage pulses are injected into both phases at the same time to determine the position where the rotor is actually located at standstill. The proposed position detection method is simple and requires no extra circuitry. The simulation results are given and show the proposed estimation method can acquire a precise rotor position accurately at a standstill condition.
Highlights
A switched reluctance motor (SRM) has attractive features such as a robust rotor structure and a wide speed range, which endow it with strong competitiveness against conventional AC motors in a variety of applications, especially in harsh environments and high-speed operation conditions [1,2,3]
Multiple position sensorless control methods of SRMs have been proposed by scholars to exclude the adoption of position sensors [4,5,6]
In [13], a highly reliable SRM starting scheme was proposed using a set of pulse injection-based position estimation algorithms at different stages of starting
Summary
A switched reluctance motor (SRM) has attractive features such as a robust rotor structure and a wide speed range, which endow it with strong competitiveness against conventional AC motors in a variety of applications, especially in harsh environments and high-speed operation conditions [1,2,3]. In [13], a highly reliable SRM starting scheme was proposed using a set of pulse injection-based position estimation algorithms at different stages of starting. The effective modeling of the magnetic characteristics is a crucial step in the pulse injection-based sensorless method. A pulse injection-based position estimation method of a two-phase SRM at standstill is proposed. Among the various position sensorless control schemes, pulse injection is a popular method that can be applied to a wide speed range. Quation (1), Equation (1) can be derived as: By injecting short voltage pulses into the phase winding at a standstill co when no ratued=cRuir+rednLt(dθfto, ir)ito=rqRui +e pulses are small, which leads to g≫Le(nθe, ir)a.+tTioh∂nLe(∂fθrile,ois)wisstddi,tivt+ehiev∂ogLl∂(etθθan,gei)erωatteerdmcurrecn(a3tn)btyhethneb twedhefreroωmisEthqeuraottaiotionn(a3l )s.peIfedt.he magnetic circuit is unsaturated, the self-inductance inrroerlaeBtveydainncjuterctrtoienntght sfeohrcourttorrvrqoeulnteatggaeennpdeurlatshteisoenintetfolromtwhes,pthhaes,geewnineinrEadtiqendugacauttiraoresnntat(n3bd)yscttiahllnecovthnodlutiastgiobenepwnuhlesegenslected. PeakTTchuhururse,snb, tab.saTedsheeodnrooEtonqruEpaotqisouintaio(t5nio),instht(he5es)ne, latf-hvinaedilsauebclltfea-niifncetdhcueacnrteablaenticooebntsachianinpedbbebetywomebeetnaasiLunraeindndgbθthyiesmeasur pkenaokwnc,uwrrheicnht.caTnhbee roobttaoirnepdofsriotmiotnheisFEthMenanaalvyasiisl.able if the relationship between a known, which can be obtained from the FEM analysis
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