Results 21 to 30 of about 11,626 (218)

POSITION CONTROL OF A DC MOTOR USING PWM-PIM DIGITAL REDESIGN METHOD [PDF]

مجله مدل سازی در مهندسی, 2009
Pulse-width modulation (PWM) is a commonly used technique in control of electric DC motors. PWM control systems have on/off control inputs with fixed amplitude and variable duty cycle. Here, a PWM control law is determined from a given discrete-time (DT)
درگاهی کرمانی, بائی
doaj   +1 more source

An ampere‐second‐vector pulse width modulation technique and fault‐tolerant control for CSI11 fed five‐phase permanent magnet synchronous motor with multiple harmonic electromotive forces

IET Electric Power Applications, 2023
When dealing with safety‐critical applications that involve multiphase permanent magnet synchronous motors (PMSMs), the current source inverter (CSI) is a superior choice compared with the voltage source inverter.
Chao Chen, Zhen Chen, Xiaoyong Sun, Congzhe Gao, Xiangdong Liu   +4 more
doaj   +1 more source

Analysis of Different PWM Techniques for Enhanced Ultrahigh Gain Z-Network Topology

International Transactions on Electrical Energy Systems
In these modern times, the Z-source inverters (ZSIs) have become a revolutionary invention ever since the year 2002. The pulse-width modulation (PWM) technique used for most of the ZSIs is simple boost control PWM (SBC-PWM), and the SBC-PWM implies for a
Vadthya Jagan, Bhavadish Chary Maheshwaram, Mallesh Usirikapally, Praveen Kumar Balachandran, B. Nagi Reddy, Sankeerthana Mettu, C. Dhanamjayulu, G. Arunkumar, K. C. Saranya, Baseem Khan   +9 more
doaj   +1 more source

Frailty Exacerbates Disability in Progressive Multiple Sclerosis

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background To evaluate frailty in severe progressive multiple sclerosis (PMS) and to investigate the underlying mechanisms. Methods This prospective, cross‐sectional, multicenter study enrolled a late severe PMS group requiring skilled nursing (n = 53) and an age, sex, and disease duration‐matched control PMS group (n = 53).
Taylor R. Wicks, Anna Wolska, Diala Ghazal, Dejan Jakimovski, Bianca Weinstock‐Guttman, Alexander Burnham, Niels Bergsland, Michael G. Dwyer, Alan T. Remaley, Robert Zivadinov, Murali Ramanathan   +10 more
wiley   +1 more source

PWM Techniques for Two-Level Voltage Source Inverters: A Comparative Study

IEEE Access
Pulse width modulation (PWM) techniques are widely used to control the switching of semiconductors in power converters. This paper presents a comprehensive overview of PWM techniques for two-level voltage source inverters and provides a comparative ...
Battur Batkhishig, Pedro F. da Costa Goncalves, Giorgio Pietrini, Babak Nahid-Mobarakeh, Ali Emadi   +4 more
doaj   +1 more source

Use of Symptomatic Drug Treatment for Fatigue in Multiple Sclerosis and Patterns of Work Loss

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective To describe the use of central stimulants and amantadine for fatigue in MS and evaluate a potential association with reduced work loss in people with MS. Methods We conducted a nationwide, matched, register‐based cohort study in Sweden (2006 to 2023) using national registers with prospective data collection.
Simon Englund, Johan Reutfors, Thomas Frisell, Fredrik Piehl   +3 more
wiley   +1 more source

Comparison of Hysteresis Based PWM Schemes ΔΣ-PWM and Direct Torque Control

Applied Sciences, 2021
This paper presents the differences and similarities of ΔΣ-PWM as a hysteresis-based PWM scheme with direct torque control (DTC) using simulation models.
Kevin Klarmann, Malte Thielmann, Walter Schumacher   +2 more
doaj   +1 more source

Air Pollution and the Risk and Progression of Multiple Sclerosis: A Systematic Review and Meta‐Analysis

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Purpose Air pollution has been linked to several neurological conditions, including stroke and neurodegenerative diseases. Evidence regarding its association with multiple sclerosis (MS) remains conflicting, limited by small sample sizes. Methods PubMed, Embase, Scopus, and Cochrane controlled register of trials (CENTRAL) were searched on ...
Ahmad A. Toubasi, Thuraya N. Al‐Sayegh
wiley   +1 more source

PWM rectifier control comparison for aerospace applications [PDF]

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014), 2014
High-voltage DC-bus power quality is examined when the power network is supplied by a PWM rectifier controlled using different DC-bus voltage regulation schemes. Three controllers are compared, a voltage oriented control and two model predictive control schemes, predictive current fixed frequency and predictive direct power control.
Todd, R., Liu, K., Lau, Y.
openaire   +3 more sources

Structure–Function Decoupling of the Sensorimotor and Default Mode Networks in Black Americans With MS

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background and Objectives Multiple sclerosis (MS) exhibits racially disparate rates of disease progression. Black people with MS (B‐PwMS) experience a more severe disease course than non‐Hispanic White people with MS (NHW‐PwMS). Here we investigated structural and functional connectivity as well as structure–function decoupling in the ...
Emilio Cipriano, Giacomo Boffa, Maria Petracca, Marta Ponzano, Nicole Graziano, Claire Wigley, Claire Riley, Jonathan Howard, Pietro Bontempi, Sylvia Klineova, Fred Lublin, Matilde Inglese   +11 more
wiley   +1 more source