Search results for "magnetisation"

showing 5 items of 5 documents

An IPMSM torque/weight and torque/moment of inertia ratio optimization

2014

In this paper, a torque/weight and torque/moment of inertia ratio optimization procedure for interior permanent magnet syncronous motors (IPMSMs) is presented. More in detail, a performance comparison between several IPMSM rotor structures has been carried out in order to determine the optimum geometry that can maximize the torque/weight and torque/moment of inertia ratios. A commercial motor, with known electrical and mechanical characteristics, has been taken as reference. Its rotor structure has been modified several times, obtaining different rotor geometries and, therefore, many IPMSM models with different electrical and mechanical characteristics. The finite element method (FEM) analy…

ynchronous motorStall torquetorque-weight ratio optimizationMaterials scienceoptimisationpermanent magnet motorfinite element methodtorque-load-angle characteristicSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettricilaw.inventioninterior permanent magnet syncronous motorPermanent magnetmagnetisationControl theorylawRotorTorque sensorTorquetorque/weight ratioInduction motorDamping torqueFEM analysiLoad modelingTorque motorRotor (electric)finite element analysis;magnetisation;optimisation;permanent magnet motors;rotors;synchronous motors;IPMSM rotor structures;finite element method;interior permanent magnet syncronous motors;torque-load-angle characteristics;torque-moment of inertia ratio optimization;torque-weight ratio optimization;Induction motors;Load modeling;Permanent magnet motors;Permanent magnets;Rotors;Stators;Torque;FEM analysis;IPMSM;optimization;permanent magnets;torque/moment of inertia ratio;torque/weight ratioControl engineeringtorque-moment of inertia ratio optimizationStatorMoment of inertiafinite element analysiIPMSMDirect torque controlTorqueIPMSM rotor structureoptimizationtorque/moment of inertia ratio
researchProduct

A field induced ferromagnetic-like transition below 2.8 K in Li2CuO2: An experimental and theoretical study

1998

The low temperature magnetic properties of the Li2CuO2 compound have been investigated by means of superconducting quantum interference device magnetometry. We find in addition to an antiferromagnetic phase below 9.5 K a ferromagnetic-like steep rise of the magnetization around 2.8 K. The observed low temperature behavior is discussed by considering second and fourth order magnetocrystalline effective anisotropy coefficients, in addition to the exchange couplings reported in the literature. Work at the Institut de Ciencia dels Materials was supported by the Spanish Comisión Interministerial de Ciencia y Technología Grant No. CICYT MAT 96-1037.

Field (physics)MagnetometerExchange InteractionsGeneral Physics and AstronomyExchange Interactions (Electron)Magnetizationlaw.inventionMagnetizationMagnetisationAntiferromagnetism:FÍSICA [UNESCO]lawPhase (matter)Magnetic propertiesFerromagnetic MaterialsCopper OxidesLi2CuO2AntiferromagnetismAntiferromagnetic MaterialsLithium OxidesAnisotropyCondensed matter physicsTemperature Range 0000-0013 KChemistryTemperature DependenceUNESCO::FÍSICALithium Compounds ; Ferromagnetic-Antiferromagnetic Transitions ; Ferromagnetic Materials ; Antiferromagnetic Materials ; Magnetisation ; Magnetic Anisotropy ; Exchange Interactions (Electron) ; Lithium Oxides ; Copper Oxides ; Magnetization ; Exchange Interactions ; Antiferromagnetism ; Ferromagnetism ; Temperature Dependence ; Temperature Range 0000-0013 KMagnetic AnisotropyMagnetic anisotropyFerromagnetismLithium CompoundsFerromagnetismFerromagnetic-Antiferromagnetic TransitionsJournal of Applied Physics
researchProduct

Mixed Fault Classification of Sensorless PMSM Drive in Dynamic Operations Based on External Stray Flux Sensors

2022

This paper aims to classify local demagnetisation and inter-turn short-circuit (ITSC) on position sensorless permanent magnet synchronous motors (PMSM) in transient states based on external stray flux and learning classifier. Within the framework, four supervised machine learning tools were tested: ensemble decision tree (EDT), k-nearest neighbours (KNN), support vector machine (SVM), and feedforward neural network (FNN). All algorithms are trained on datasets from one operational profile but tested on other different operation profiles. Their input features or spectrograms are computed from resampled time-series data based on the estimated position of the rotor from one stray flux sensor t…

Support Vector Machinedemagnetisationinter-turn short circuitChemical technologydemagnetisation; inter-turn short circuit; machine learning; permanent magnet synchronous motor; variable speed; variable loadTP1-1185BiochemistryAtomic and Molecular Physics and OpticsAnalytical ChemistryComputingMethodologies_PATTERNRECOGNITIONmachine learningpermanent magnet synchronous motorvariable speedVDP::Teknologi: 500::Maskinfag: 570Magnetsvariable loadNeural Networks ComputerSupervised Machine LearningElectrical and Electronic EngineeringInstrumentationAlgorithmsSensors (Basel, Switzerland)
researchProduct

Optical and magnetic properties of ZnCoO thin films synthesized by electrodeposition

2008

Ternary Zn1−xCoxO crystalline films with different compositions were grown by electrodeposition. The Co content in the final compound is linked to the initial Co/Zn ratio in the starting solution. X-ray diffraction reveals a wurtzite structure for the Zn1−xCoxO films. Transmittance spectra show two effects proportional to Co content, a redshift of the absorption edge and three absorption bands, which are both interpreted to be due to the Co incorporated into the ZnO lattice. The amount of deposited charge was used to get a precise control of the film thickness. Magnetic measurements point out that Co(II) ions are isolated from each other, and consequently the films are paramagnetic. Francis…

Materials scienceCobalt ; Electrodeposition ; Magnetic susceptibility ; Magnetic thin films ; Magnetisation ; Paramagnetic materials ; Semiconductor growth ; Semiconductor thin films ; Semimagnetic semiconductors ; Zinc compoundsParamagnetic materialsAnalytical chemistryUNESCO::FÍSICAGeneral Physics and AstronomySemiconductor thin filmsMagnetic semiconductorCobaltSemiconductor growthMagnetic susceptibilityMagnetic susceptibilityMagnetizationParamagnetismNuclear magnetic resonanceMagnetic thin filmsMagnetisationAbsorption edgeElectrodeposition:FÍSICA [UNESCO]Semimagnetic semiconductorsZinc compoundsThin filmTernary operationWurtzite crystal structure
researchProduct

Field Reconstruction for Modeling Multiple Faults in Permanent Magnet Synchronous Motors in Transient States

2021

Conventional field reconstruction model (FRM) for electrical machines has proved its main strength in efficient computations of magnetic fields and forces in healthy permanent magnet synchronous machines (PMSM) or faulty machines in steady states. This study aims to develop a magnet library of different magnet defects and include inter-turn short-circuit (ITSC) in the FRM for PMSM. The developed FRM can model a combination fault between ITSC, and magnet defect in a PMSM in transient states. Within the framework, an 8-turn ITSC was modelled in both finite element analysis (FEA) and FRM, and then identified by the extended Park’s vector approach. The air-gap magnetic field reproduced b…

General Computer ScienceRotor (electric)Computer scienceStatorMathematics::General Mathematicsinter-turn short circuitfield reconstructionGeneral EngineeringFault (power engineering)Finite element methodlaw.inventionMagnetic fieldTK1-9971VDP::Teknologi: 500DemagnetisationlawControl theoryElectromagnetic coilMagnetpermanent magnet synchronous motorGeneral Materials ScienceTransient (oscillation)Electrical engineering. Electronics. Nuclear engineeringIEEE Access
researchProduct