This study presents a novel phase current reconstruction strategy for switched reluctance machines (SRMs) using two cross‐winding sensors. The currents are reconstructed by solving the linear equations associated with adjacent in different turn‐on regions. effect of sensor offset and power transistor fault on proposed method is analysed. On basis difference at rising edge each drive signal, an identification presented online compensation schemes adopted. For short‐circuit fault,...

Solubilities of CO2 have been measured in five low volatile organic solvents at temperatures ranging from 293.15 to 323.15 K with 10K intervals under a pressure 0 600.0 kPa using an isochoric saturation method. These were selected γ-butyrolactone (GBL), butyl lactate (BL), 1,1,3,3-tetramethylurea (TMU), 1,3-dimethyl-2-imidazolidinone (DMI), and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU). Henry's constants thermodynamic properties such as Gibbs free energy, enthalpy, entropy...

Power converter is critical but prone to be failure in switched reluctance motor (SRM) drives. The open- and short-circuit fault characteristics of freewheeling diode asymmetric bridge power are analyzed details. Based on logic judgment, four online diagnostic methods with digital phase current analysis proposed this paper. features extracted by analyzing the relationship between chopping signal information from some special positions. carried out according obtained detecting dc bus lower...

The regulation of phase currents is bound by the voltage power source for switched reluctance motor (SRM) drive with conventional asymmetric half-bridge (AHB) converter in electric vehicle (EV). To avoid drawback, an improved active boost self-balanced capacitor voltages proposed. First, problems existing AHB are analyzed different stages each current. Then working modes proposed investigated. corresponding control strategies implemented light two conduction sequences. reference obtained a...

Aiming at lowering the cost and enhancing current dynamics for switched reluctance motor (SRM) system, a novel-driven scheme is proposed by combing self-boost voltage converter (SBVC) chopping limit active regulation (CLAR) control strategy. First, working modes of SBVC are analyzed during one-phase two-phase operation situations. And dc-link pump-up mechanism capacitor parameters selection method developed. Then, CLAR strategy performed to adjust excitation demagnetization then shape...

In order to improve the fault-resilient capacity of switched reluctance starter/generator systems, this article presents a fault diagnosis and tolerant strategy for position sensors system. The method, based on capturing pulse edges signals, has very high flexibility reliability. Moreover, fault-tolerant control is proposed, which can be used in nonuniform variable speed conditions. principle proposed record three adjacent time intervals, updated each edge then fourth interval obtained...

The relationship model between the droplet lifetime and interface properties is established to characterize stability of oil droplets, then, influence alkali–surfactant–polymer (ASP) concentration on analyzed by theoretical calculations. dynamic characteristics oil-in-water (O/W) emulsions from ASP flooding were evaluated using emulsion (Civan model) based two-phase separation. effect was explored analyzing film strength qualitatively measuring interfacial tension ζ potential. results showed...

A new method for modeling stator winding fault with one shorted coil in a switched reluctance motor (SRM) is presented this paper. The based on artificial neural network (ANN), incorporated simple analytical model electromagnetic analysis to estimate the flux-linkage characteristics of SRM under fault. magnetic equivalent circuit ANN applied calculate nonlinear condition. 12/8 prototype system developed verify effectiveness proposed method. results are obtained from and experimental work...

Implementation of fault diagnosis for power converter is critical to improve the reliability electric vehicle (EV) with switched reluctance motor (SRM) drive. Conventional methods are usually suitable a single chopping mode or certain control strategy. To avoid problem, virtual current coefficient-based method transistors proposed considering different modes, strategies, and cases simultaneously. The multipoint detection obtain more information, which capable providing remarkable features....

To improve the speed synchronization performance of dual switched reluctance motor (SRM) drive with traditional sliding mode control (TSMC), improved (ISMC) based cross-coupling strategy is proposed. First, overall structure dual-SRM represented. Second, state variable introduced to reduce torque fluctuation and adjustment time dynamic process each SRM in system on surface reaching law. The adaptive law into controller avoid load observation. Third, ISMC-based method for designed. novel...

Winding insulation degradation may lead to phase‐to‐phase fault in switched reluctance machines (SRMs). First, the modes are described considering connected sequence of coils and behaviours analysed details. Second, equivalent circuit three‐phase windings is represented faulty SRM modelled based on derived electromechanical equations. Third, locations three current sensors optimised calculate incoming line outgoing each phase without utilisation any extra hardware. The can be detected...

This study presents a generalised fault diagnosis method for power transistors in the asymmetric half‐bridge converter of switched reluctance motor (SRM) drive. In order to extract remarkable features, three current sensors are rearranged. Each phase can be calculated by solving equations associated with detected values and coefficients obtained based on different switching states. Different faults preliminarily monitoring error between estimated bus actual current. After identification...

This study presents a low‐cost switched reluctance machine (SRM) drive system with reduced current sensors and position sensors. The reduction of is achieved by rearranging the location adopted sensors, each phase calculated decomposing from two special positions. realised optimising conventional slotted disc. Being different three‐phase 12/8 SRM system, developed only requires one sensor. First, proposed detection method illustrated in details. Second, measures to solve three key problems...

More electric aircraft (MEA) is expected to optimize performance, and the switched reluctance starter/generator (SR S/G) system recommended as a key technique for MEA implementation. In order improve safety reduce maintenance time, it necessary quickly identify locate electrical faults in system. This article proposes fault diagnosis method power converter of SR S/G MEA. Through distortion analysis cross-leg current, proposed methods are capable detecting both open circuit (OC) short (SC)...

The optoelectronics performances of two-dimensional Cu-doped SnO2 nanosheets were investigated by first-principles calculations on the basis density functional theory (DFT) and experiments. First, crystal structures built analyzed using DFT within generalized gradient approximation (GGA). total energy was discussed qualitatively quantitatively from three aspects: charge density, band structure, state density. results show that copper doping has little effect distribution because similar...

It is difficult to obtain an accurate mathematical model of a switched reluctance motor (SRM). In this article, the current difference-based model-free predictive control (CDB-MFPCC) strategy proposed. A novel updated method difference given considering delay. The beetle antennae search algorithm applied adjust proportional and integral coefficients increase dynamic response. Only phase at two consecutive sampling points required in method. Moreover, recursive least square-based strategies...

In order to improve the dynamic performance of speed synchronization method for dual switched reluctance motor (SRM) drive, an improved virtual-shaft control strategy is proposed. The scheme optimized from two aspects. First, torque distribution and adjustment introduced into overall dual-SRM drive. load SRMs observed with sliding mode observer. Then, feedforward reference each SRM calculated according virtual motor. operating states are rapidly reflected in method. Second, nonsingular...

This article proposes a novel cost-effective phase current sensing scheme for switched reluctance motor (SRM) drives. An online error correction strategy is involved in the proposed detection accuracy enhancement. First, operation principles of conventional schemes are illustrated SRM systems. Besides, types sensor errors and their impact on performance discussed detail. Then, with idea multiplexing multiple information measurement. Additionally, applicability analysis carried out....

Saturation and current measurement errors will decrease the accuracy of rotor position estimation for switched reluctance motor (SRM). To avoid drawbacks, a method based on unsaturated inductance reconstruction is proposed considering errors. Firstly, incremental, apparent inductances are analyzed. The calculated with similar triangle solution in normal condition during linear rising region. pulse injection, regression algorithm used to calculate virtual falling region adjacent phase. Then...

Accurate phase currents are necessary for the control and protection of motor drives. In this article, a novel current reconstruction strategy switched reluctance motors (SRMs) with single sensor is proposed. Firstly, characteristic unsaturated inductance analyzed. Secondly, location rearranged, all flow through in positive direction. The region directly obtained by dividing flux linkage inductance. linear region, calculated solving similar triangles according to relationship between...