Results 41 to 50 of about 80,128 (213)
Direct torque control for dual three-phase induction motor drives [PDF]
, 2004 A direct torque control (DTC) strategy for dual three-phase induction motor drives is discussed in this paper. The induction machine has two sets of stator three-phase windings spatially shifted by 30 electrical degrees.
Bojoi, R. +4 more
core +1 more source
Atmospheric Circulation Response to Short-Term Arctic Warming in an Idealized Model [PDF]
, 2020 Recent Arctic sea ice loss in fall has been posited to drive midlatitude circulation changes into winter and even spring. Past work has shown that sea ice loss can indeed trigger a weakening of the stratospheric polar vortex, which can lead to delayed ...
Hell, Momme C. +2 more
core +2 more sources
Energies, 2021 In order to expand the speed range for an indirect matrix converter–surface mounted permanent magnet synchronous motor drive (IMC-SPMSM), a wide speed range operation control strategy based on a flux-weakening control and an over-modulation method is ...
Nuofan Zou +3 more
doaj +1 more source
Variable-speed Generators with Flux Weakening [PDF]
, 1993 A cost-competitive, permanent-magnet 20 kW generator is designed such that the following criteria are satisfied: an (over) load capability of at least 30 kW over the entire speed range of 60-120 rpm, generator weight of about 550 lbs with a maximum ...
Carlin, P. W. +2 more
core +1 more source
Sensorless Direct Flux Vector Control of Synchronous Reluctance Motors Including Standstill, MTPA, and Flux Weakening [PDF]
IEEE Transactions on Industry Applications, 2017 This paper proposes a sensorless direct flux vector control scheme for synchronous reluctance motor drives. Torque is controlled at constant switching frequency, via the closed loop regulation of the stator flux linkage vector and of the current component in quadrature with it, using the stator flux oriented reference frame.
Yousefi-Talouki, Arzhang +2 more
openaire +2 more sources
IEEE Access, 2019 Fractional slot concentrated winding machines (FSCWMs) with the low operation speed and large diameter usually have a large number of poles and slots; thus, numerous pole/slot combinations are feasible.
Zichong Zhu +3 more
doaj +1 more source
An Adjustable Wide-Range Speed-Control Method for Sensorless IPMSM Drive Systems
IEEE Access, 2022 This paper proposes an adjustable wide-range speed-control method for sensorless IPMSM drive systems from standstill, low-speeds, middle-speeds, and high-speeds in the flux-weakening region.
Muhammad Syahril Mubarok, Tian-Hua Liu
doaj +1 more source
Stokes diagnostics of simulated solar magneto-convection [PDF]
, 2007 We present results of synthetic spectro-polarimetric diagnostics of radiative MHD simulations of solar surface convection with magnetic fields. Stokes profiles of Zeeman-sensitive lines of neutral iron in the visible and infrared spectral ranges emerging
A. Vögler +47 more
core +2 more sources
Advanced deep flux weakening operation control strategies for IPMSM
International Journal of Electrical and Computer Engineering (IJECE), 2021 This paper proposes an advanced flux-weakening control method to enlarge the speed range of interior permanent magnet synchronous motor (IPMSM). In the deep flux weakening (FW) region, the flux linkage decreases as the motor speed increases, increasing instability.
Pham Quoc Khanh, Ho Pham Huy Anh
openaire +2 more sources
Alkalinity responses to climate warming destabilise the Earth’s thermostat
Nature Communications, 2023 The weathering alkalinity flux from mid-latitudes to the ocean will be strongly altered by climate warming by 2100. Under different emissions scenarios either a strengthening or a weakening of the flux and thus of the oceanic CO2 buffer is predicted.
Nele Lehmann +7 more
doaj +1 more source