Results 21 to 30 of about 55,867 (251)
机车电传动, 2020 After the adoption of SiC device in traction converter for rail transit, the design of traction system will be negatively affected by the high switching speed and high switching frequency of power switch devices.
Yongjian ZHI +5 more
doaj
Energies, 2020 Adjustable speed drives use Pulse Width Modulation (PWM) to switch DC-bus voltage for the synthesis of three-phase voltages to provide power to the permanent magnet synchronous motor (PMSM).
Muhammad Aqil, Jun-Hyuk Im, Jin Hur
doaj +1 more source
Suppression of common-mode voltage in a PWM rectifier/inverter system
, 2001 This paper proposes a PWM rectifier/inverter system capable of suppressing not only supply harmonic currents but also electromagnetic interference (EMI).
S. Ogasawara +3 more
core +1 more source
Evaluation of Bearing Voltage Reduction in Electric Machines by Using Insulated Shaft and Bearings
, 2020 Bearing voltages and corresponding currents in electric machines driven by pulse width modulation (PWM) converters with fast switching and high dv/dt can cause premature bearing failures.
Peng Han +9 more
core +1 more source
A 3D Reduced Common Mode Voltage PWM Algorithm for a Five-Phase Six-Leg Inverter
Machines, 2023 Neutral point voltage control converters (NPVCC) are being considered for AC drive applications, where their additional degree of freedom can be used for different purposes, such as fault tolerance or common mode voltage (CMV) reduction.
Markel Fernandez +5 more
doaj +1 more source
Combined Effect of TID Radiation and Electrical Stress on NMOSFETs
Micromachines, 2022 The combined effect of total ionizing dose (TID) and electrical stress is investigated on NMOSFETs. For devices bearing both radiation and electrical stress, the threshold voltage shift is smaller than those only bearing electrical stress, indicating ...
Yanrong Cao +12 more
doaj +1 more source
Measurement of Direct Current Voltage Causing Electrical Pitting
Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2010 It is widely known that electrical pitting occurs when an electrical current is passed through a ball or roller bearing. The authors have investigated critical electrical current density causing electrical pitting and have shown that it occurs in a ball ...
Shoji NOGUCHI +2 more
doaj +1 more source
Pediatric Blood &Cancer, EarlyView.ABSTRACT Background Sickle cell disease (SCD) is a chronic, inherited hemoglobinopathy that requires frequent hospitalization for disease‐related complications. Canadian data on inpatient care is limited. This study compared caregiver‐reported hospital experiences of children with SCD to those with cystic fibrosis (CF), a chronic, autosomal recessive ...
Hailey M. Zwicker +11 more
wiley +1 more source
Wind Turbine Generator Reliability: An Exploration of the Root Causes of Generator Bearing Failures [PDF]
, 2013 Increasing the availability of multi-megawatt wind turbines (WT) is necessary if the cost of energy generated by wind is to be reduced. Reliability surveys have shown that WT generator bearings have a relatively high failure rate, with failures happening
WHITTLE, MATTHEW
core
WLI, XPS and SEM/FIB/EDS Surface Characterization of an Electrically Fluted Bearing Raceway
LubricantsElectrical bearing currents may disturb the performance of the bearings via electro-corrosion if they surpass a limit of ca. 0.1 to 0.3 A/mm2. A continuous current flow, or, after a longer time span, an alternating current or a repeating impulse-like ...
Omid Safdarzadeh +4 more
doaj +1 more source