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Questions related from Osama Arafa
My team has built a three-level three-phase PV inverter (grid-tied) of 20 kW rating and the point of common coupling is 50 Hz, 380 Vrms (line-to-line). For safe operation, we implemented too many...
09 September 2022 7,980 10 View
Hi colleagues, I have read interesting research titled "Instantaneous Voltage Measurement in PWM Voltage Source Inverters" authored 2007 by Prof. Todd D. Batzel, of Pennsylvania State University,...
30 January 2022 8,252 0 View
I am working on an algorithm that receives 4 pulsating inputs to produce two continuous outputs. A numerical model that enables numerical simulation is all that I have in hand. However, the...
26 March 2020 8,683 5 View
In two-level inverters, the duty ratio and complementary switching of upper and lower switches with dead-time insertion are all what is needed to drive the six switches of the inverter. DSP...
17 August 2019 6,591 5 View
The angle found by incremental encode interface is reset to zero by the index signal. In perfect situation, the mounting of the encoder should guarantee that the index happens at the very instant...
27 December 2018 1,363 1 View
A single phase micro grid composed of some synchronized diesel generators and some loads undergoes wide changes in operational frequency due to the dynamic interaction between its load and its...
13 October 2018 6,190 18 View
In an Internal Combustion Engine (ICE) the radiator, the coolant, the coolant circulating pump, the throttling or regulating thermostat and the fan switching thermostat are all working in tandem...
08 April 2018 7,354 4 View
Dear Mechanical Engineering experts, I need your urgent support: - How long does it take for an Internal combustion Engine to get the engine block overheated after a cooling system failure? and...
03 January 2018 4,923 7 View
For induction motor driven air blower (with no speed control), what is the impact of blocked suction and blocked discharge respectively on: - the motor speed - the motor power - the motor...
27 October 2017 831 5 View
On connecting renewable energy sources (wind, PV etc) to electric power grids, it is necessary to estimate the grid angle at the point of common coupling so that power electronics converters can...
16 March 2016 6,392 8 View
Some state estimators/observers in electrical drives applications need (as inputs) the voltages impressed on the machine terminals. Knowing that these voltages are always modulated using high...
25 July 2015 289 7 View
Permanent Magnet Synchronous Motors (in particular surface-mounted magnet type) can have two basic types of position encoder alignment or in other words back EMF can be sin or cosine functions of...
25 July 2015 8,004 2 View
I need from the co-author to provide a SIMULINK dynamic model of a "1.5 HP centrifugal pump combined with a pressurized air vessel and a valve on the discharge" ? The model should be ready for...
12 March 2015 3,591 2 View
I am working on a sensorless control scheme of PMSM based on Adaptive Luenberger (state) Obsever. It is relatively easy to set the observer gain to reach stable and successful observer tracking in...
23 February 2015 8,532 5 View
Sometimes motor builders don't provide this important piece of information that is critical to Field oriented control of sinusoidal (AC) permanent magnet brushless motors. In this question I...
02 January 2015 8,818 6 View
One of the areas that academic communities can exchange to support each other in upgrading and boosting research activities is the details of the core laboratory equipment that a certain...
01 January 1970 7,394 4 View
For Arabic Native speakers, occasionally we face some technical terms which are challenging for translators. The theory says that concepts and terms that are understandable can be expressed in any...
01 January 1970 4,586 10 View
Hello, power electronics specialists, In a business case, we meet this requirement, a client needs to make use of standard On-shelf VSI in modular size to operate in parallel to feed a single...
01 January 1970 9,128 0 View
