Results 61 to 70 of about 26,332,569 (198)

Influence of Air Layer Characteristics on the Heat Transfer Performance of Photovoltaic Dairy Barn Roofs

open access: yesAgriculture
To enhance energy utilization efficiency, dairy farmers have increasingly adopted photovoltaic (PV) panels on barn roofs. However, there is currently a general separation between the barn construction and the additional aspects of the PV system.
Qi Wang   +8 more
doaj   +1 more source

Harmonic Analysis of Airgap Magnetic Fields in Doubly-Fed Flux Reversal Permanent Magnet Machines

open access: yesIEEE Access, 2020
Doubly-fed flux reversal permanent magnet (DF-FRPM) machine with two independent armature windings accommodating in stator and rotor slots separately exhibits larger torque density than conventional FRPM due to higher utilization rate of rotor space.
Yuting Zheng   +4 more
doaj   +1 more source

Feed-Forward Method for Increasing Efficiency of BLDC Motors by Injection of Higher Time-Harmonic Components

open access: yesIEEE Access
BLDC motors are increasingly used in battery-powered and industrial applications due to their high efficiency and reliability. However, their performance is often degraded by current ripple and torque pulsations caused by higher-order harmonic components
Jan Stejskal, Miroslav Chomat
doaj   +1 more source

Detection of Inter-turn Faults in Five-Phase Permanent Magnet Synchronous Motors

open access: yesAdvances in Electrical and Computer Engineering, 2014
Five-phase permanent magnet synchronous motors (PMSMs) have inherent fault-tolerant capabilities. This paper analyzes the detection of inter-turn short circuit faults in five-phase PMSMs in their early stage, i.e. with only one turn in short circuit by
SAAVEDRA, H., RIBA, J.-R., ROMERAL, L.
doaj   +1 more source

The Influence of Measurement Methodology on the Accuracy of Electrical Waveform Distortion Analysis

open access: yesMeasurement Science Review, 2018
The present paper covers a review of documents that specify measurement methods of voltage waveform distortion. It also presents measurement stages of waveform components that are uncommon in the classic fundamentals of electrotechnics and signal theory,
Bartman Jacek, Kwiatkowski Bogdan
doaj   +1 more source

Current Controller with FOPI Modification for VSI-based Active Power Filter

open access: yesEmitor: Jurnal Teknik Elektro
The integration of photovoltaic (PV) systems into the grid, combined with nonlinear loads and bidirectional power flows, significantly impacts grid voltage stability and total harmonic distortion (THD) in low-voltage distribution systems.
Antonius Doddy Tyas Prasetyo   +2 more
doaj   +1 more source

Harmonic Analysis of a Nonstationary Series of Temperature Paleoreconstruction for the Central Part of Greenland [PDF]

open access: yesУчёные записки Казанского университета: Серия Естественные науки, 2016
The results of the investigations of a transformed series of reconstructed air temperature data for the central part of Greenland with an increment of 30 years have been presented.
T.E. Danova, B.V. Perelygin
doaj  

Operator Theory and Harmonic Analysis

open access: yesSpringer Proceedings in Mathematics & statistics, 2021
D. Albrecht, X. Duong, A. Mcintosh
semanticscholar   +1 more source

Machine-side Harmonic Suppression Strategy for Direct Driven Five-phase PMSG of Wind Power Generation System

open access: yesAdvances in Electrical and Computer Engineering
Wind power generation system with five-phase PMSG contains a large amount of third harmonic in the stator phase current of the machine side due to the dead-time effect of the converter and non-sinusoidal air-gap magnetic field.
JIANG, Z., ZHANG, J.
doaj   +1 more source

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