Effects of electroacupuncture of different frequencies on electromyography, NOS and ICC of colon in rats with slow transit constipation
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Acupuncture and Tuina Science"
DOI: 10.1007/s11726-020-1151-6
Abstract: Objective To observe the effects of electroacupuncture (EA) of different frequencies on transmission function, electromyography, nitric oxide synthase (NOS) content and interstitial cells of Cajal (ICC) expression of colon in rat models with slow transit… read more here.
Keywords: frequency group; frequency; group; low frequency ... See more keywords
Investigation of efficiency models in EnergyPlus and AMCA standard 207 for induction motors powered by variable frequency drives
Sign Up to like & getrecommendations! Published in 2019 at "Energy and Buildings"
DOI: 10.1016/j.enbuild.2019.04.045
Abstract: Abstract Variable frequency drives (VFDs) are widely applied on induction motors to reduce motor electrical power under partial load conditions by adjusting both the frequency and voltage. For centrifugal fan, pump and compressor applications, a… read more here.
Keywords: frequency drives; motor; motor efficiency; variable frequency ... See more keywords
A new pump selection method for large-power PV irrigation systems at a variable frequency
Sign Up to like & getrecommendations! Published in 2018 at "Energy Conversion and Management"
DOI: 10.1016/j.enconman.2018.08.071
Abstract: Abstract This paper presents a new method for selecting a pump for large-power PV irrigation systems working at a variable frequency. This can have a significant impact since the traditional way of selecting the pump… read more here.
Keywords: large power; pump; power irrigation; variable frequency ... See more keywords
Speed and torque estimation of variable frequency drives with effective values of stator currents
Sign Up to like & getrecommendations! Published in 2020 at "IFAC-PapersOnLine"
DOI: 10.1016/j.ifacol.2020.12.270
Abstract: Abstract We introduce a new method for torque and speed estimation of induction motors under voltage/frequency (V/f) open-loop control. In contrast to existing approaches that need the phase current, the proposed algorithm only requires the… read more here.
Keywords: speed torque; torque estimation; frequency; variable frequency ... See more keywords
Consensus structures of the Mo(v) sites of sulfite-oxidizing enzymes derived from variable frequency pulsed EPR spectroscopy, isotopic labelling and DFT calculations.
Sign Up to like & getrecommendations! Published in 2017 at "Dalton transactions"
DOI: 10.1039/c7dt01731f
Abstract: Sulfite-oxidizing enzymes from eukaryotes and prokaryotes have five-coordinate distorted square-pyramidal coordination about the molybdenum atom. The paramagnetic Mo(v) state is easily generated, and over the years four distinct CW EPR spectra have been identified, depending… read more here.
Keywords: frequency pulsed; spectroscopy isotopic; sulfite oxidizing; oxidizing enzymes ... See more keywords
Low THD Grid Connected Converter Under Variable Frequency Environment
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Access"
DOI: 10.1109/access.2019.2904141
Abstract: This paper is aimed at achieving unity power factor and low total harmonic distortion (THD) at the input side of a grid connected three-phase rectifier in a variable grid frequency environment. Variable grid frequency results… read more here.
Keywords: low thd; frequency; variable frequency; frequency environment ... See more keywords
Dynamic Online Grid Impedance Estimation and Its Effects on DC Capacitor Lifetime in Variable Frequency Drive
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Access"
DOI: 10.1109/access.2022.3197894
Abstract: Grid impedance plays a significant role in the performance and design considerations of nonlinear devices like Variable Frequency Drive (VFD). VFD operates across domestic, industrial, and residential applications under different grid configurations and capacities including… read more here.
Keywords: grid impedance; lifetime; impedance; frequency drive ... See more keywords
A Review of Modeling and Mitigation Techniques for Bearing Currents in Electrical Machines With Variable-Frequency Drives
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Access"
DOI: 10.1109/access.2022.3225119
Abstract: The converter switching in variable-frequency drives can generate high frequency common mode voltage between the machine winding and the converter ground, leading to high frequency parasitic currents which can flow through the machine bearings unless… read more here.
Keywords: bearing currents; frequency; frequency drives; variable frequency ... See more keywords
Multiple Harmonics Analysis for Variable Frequency Asymmetrical Pulsewidth-Modulated Wireless Power Transfer Systems
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Transactions on Industrial Electronics"
DOI: 10.1109/tie.2018.2850015
Abstract: Variable frequency asymmetrical pulsewidth modulation (VFAPWM) is widely used in wireless power transfer (WPT) systems to control the amount of power transferred. This control scheme is also adopted in Qi, one of the world's most… read more here.
Keywords: harmonics; multiple harmonics; variable frequency; asymmetrical pulsewidth ... See more keywords
Highly Efficient Single-Phase Buck–Boost Variable-Frequency AC–AC Converter With Inherent Commutation Capability
Sign Up to like & getrecommendations! Published in 2020 at "IEEE Transactions on Industrial Electronics"
DOI: 10.1109/tie.2019.2914644
Abstract: This paper introduces a novel single-phase buck–boost noninverting variable-frequency ac–ac converter that offers higher efficiency compared to the competitors. This converter utilizes a lower number of semiconductors. A simple and flexible switching strategy is also… read more here.
Keywords: buck boost; converter; phase buck; frequency ... See more keywords
Influence of Voltage Harmonics on Partial Discharge Diagnostics in Electric Motors Fed by Variable-Frequency Drives
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Transactions on Industrial Electronics"
DOI: 10.1109/tie.2021.3134085
Abstract: Typically, in partial discharges (PD) diagnostics tests carried out in a laboratory, harmonic content in a voltage waveform is ignored. However, during the operation of variable-frequency drives (VFD)-fed electric motors, the distorted voltage waveform is… read more here.
Keywords: electric motors; voltage waveform; voltage; harmonics ... See more keywords