Questions tagged [electrical-engineering]
Study and applications of electricity, electronics, and electromagnetism. Use this tag when someone who has trained as an electrical engineer is likely to be able to answer your question.
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Are two solars panels more efficient than only one of twice the power output?
Is there any advantage to use two 50 W solar panels in parallels instead of one 100 W panel?
As we know, the effect of partial shadow on a solar panel can make the whole panel ineffective. We want to ...
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Controls architecture for stepper drivers
I am working on a project which deals with a large number of stepper motors and other devices. A key feature I want to achieve is create a modular/ expandable system, so that new devices can be easily ...
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Inductor calculations helper script and motor idea
I have an idea for a motor involving the use of a flyback transformer to recycle EMF in a custom designed pole-to-pole repulsion-attraction DC motor. I wrote a script to help with setting design ...
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So even though the raw materials of semiconductors are cheap why is their cost so high and why don't we use conductor for the same job?
The materials used in making semiconductor are cheap and readily available then does the cost of processors so high can't we use metals like copper and iron which very good conductor for manufacturing ...
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Electro Aero Dynanamics, thrust of ionic wind of a electric field
Closed. This question is off-topic. It is not currently accepting answers.
This question appears to be about engineering, which is the application of scientific knowledge to construct a solution to ...
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Is there a reason many EEE undergrad programms have a Complex Analysis Course?
I know the very broad applications of complex numbers in engineering, although I don't understand the applications of complex functions of complex variables. Things such as the Residues, Cauchy ...
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Failed in upload firmware to esp32
I'm having an issue when uploading code to my ESP32. Previously, I had configured the partition scheme to 'minimal,' and I was able to upload code without any problems. However, after I fixed my ...
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Electricity generation from sand particles in airstream hitting surface [closed]
I read an experiment which demonstrated that metal filings fired at a surface using air blasts charges the particles, surface and airstream. I understand this is triboelectricity, resulting from ...
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How could we aproach development of touchscreen with morphing surface or morphing keyboard?
There is this technology of braille e-readers. It is relatively simple and reliable but it never had much commercial success probably because small customer base.
In past a company called Tactus tried ...
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What are the issues with using a general purpose motor on a variable frequency drive?
What happens in this scenario - a modern electrical motor, three phase, squirrel cage, that is not specifically designed for operation via frequency inverter, is in fact operated on an FI? How long ...
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RPI Pico GPIO output not producing square wave
I have an RPI Pico that is configured to pulse GPIO 5 every 1000 microseconds to control a stepper driver. For some reason, this pins output does not produce a square wave, instead I am seeing a ...
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Pressure Boosting Pump Running Overcurrent
I'm working on an industrial water re-circulating system that is having an overcurrent issue that is baffling everyone involved (design engineer/plumber/electrician/pump and motor Mfg).
The system ...
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Confusion regarding SI units of K (stiffnes)
I know that stiffness, K is equal to product of moment of inertia and square of natural frequency
K = Jωn2
Where K = stifness, J = moment of inertia and ωn = natural frequency
SI unit of J is kg m2, ...
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What does 12CC refer to when talking about voltage?
Is it 12V with a connector?
For example in the data sheet here: https://www.hydraulicmegastore.com/product/vcf12nc12cc/
Is this related in any way? (A DMP-12CC connector cable)
https://www.monacor.com/...
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Would a conical-shaped solenoid be propelled by its interaction with the Earth's magnetic field?
I am wondering if the interaction between the magnetic field created by a conical-shaped solenoid and the Earth's magnetic field will result in this conical-shaped solenoid being propelled through the ...
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Calculating runtime of battery
I'm a CS guy so I am pretty clueless when it comes to electrical engineering, so maybe you people can help me with this one. I have a Battery with 550 mAh capacity. I also have a small e-paper display ...
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Using the electrolysis of water to cool a room
Browsing the internet yesterday I came across this very esoteric paper which purports to describe the construction of a device which uses the electrolysis of water into hydrogen and oxygen (a highly ...
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Methods for precission control of a freezer cooling output
I am doing some experiments in fractional freezing with a modified residential deep freezer. I have programmed my own PID controller on an Arduino setup such that it will not cycle the refrigeration ...
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Tunable phase delay for RF modulation
I've been trying to understand if there's a way to create two RF signals at the same frequency with a fixed, tunable phase delay. The goal is for one to trigger an RF-modulated laser and the other an ...
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Controlled oscillation of a piano string by electromagnetic, mechanical, or other means
What would be a good way to actively control the loudness of an acoustic piano note over time after the note has already been struck by the hammer, such as by actively changing the amplitude of a ...
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Braking system for a miniature ‘Drop tower’ rollercoaster
The tower itself is only max 400mm.
Designing the lifting system isn’t the problem but slowing down the gondola is posing a slight problem, any suggestions?
I have looked into using magnets but I can’...
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BLDC motor don't rotate through the C code flashed nor ST Pilot Motor unless I manually rotate it first
I'm using the nucleo-f302r8 + x-nucleo-ihm08m1 + a BLDC motor. I'm trying to make the motor spin on the press of a push-button. I made a C code for it but unfortunately, my motor seems stuck when I ...
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LED moving head bearing
I'm in the process of building a simple led moving head like This ADJ Pocket Pro, my POC will be much simpler but you get the direction I'm going. Electronics are working, now I just need a proper way ...
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Would it be feasible to use the water vapor produced from hydrogen internal combustion engines to power a steam generator in a car?
In a standard internal combustion engine, exhaust temperatures typically approach 400-500 degrees Celsius for standard applications. If we consider that the primary exhaust gas of hydrogen engines is ...
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What would be the best capacitor to use for a railgun that uses a capacitor as the projectile?
I have had a long-time interest and fascination with railgun technology and for a long time I have wanted to build a small-scale, simple railgun as a scientific experiment. This railgun is designed to ...
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Measuring Pressure of a Press Machine
I am designing a heat press and need pressure feedback of the force or pressure being applied to the product.
I need to measure the pressure between to press plates on a hydraulic press.
I would like ...
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Nuclear weapon doubts
Sorry I am not an Engineering professional or student. But I had a question regarding US Nuclear weapons. Specifically, is it possible that Nuclear weapons we created in the 50s still work?
The major ...
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Converting RMS to Maximum Power
If I have a sinusoidal voltage signal of amplitude $V_m$ driving a resistance $R$, what is the relationship between the RMS power $P_{rms}$ and the maximum power $P_{max}$ delivered to the resistance?
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Faulty capacitor identification
I was testing my SVPWM power board with a light bulb load instead of the AC servo motor. It worked a few times while testing. The bulb would turn on and my PWM was verified.
The last time I turned it ...
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Spinning, hot and cold reserve
I am facing a challenge in understanding the actual meaning of spinning reserve, hot reserve as well as cold reserve as used in power generation.
Anyone to help clarify for me please.
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Looking to make a retractable disco ball
I am looking to make a disco ball that sits in its normal position, attached to a ceiling, but to be able to hit a switch and it track upwards at a 90° angle to be hidden horizontally in a case. I am ...
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Viability of bladeless wind power generation
I have recently thought of two designs for bladeless wind power generation;
And
They both essentially ionizes the incoming wind which then passes through a coil, the flow of charged wind particles ...
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How does resistivity affect the susceptibility of a steel alloy to induction heating?
For context, my question is related to the use of heating to elongate studs for casing tightening and loosening. In turbine casing assembly, in addition to torquing the nuts, studs have holes drilled ...
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How to measure the electrical properties to ensure the performance of a thin electrode/insulator stack-up?
I am a mechanical engineer by trade, and I am looking at some basic electrical properties that I need to measure to ensure the device meets the desired performance. The device consists of a two-layer ...
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Why are the indices of term of the Cauchy Stress Tensor and Maxwell Stress Tensor opposite to each other?
For CST (https://en.wikipedia.org/wiki/Cauchy_stress_tensor), the first index represents the plane and the second index represents the direction:
For MST (https://en.wikipedia.org/wiki/...
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Solenoid Valve Resistance
This is basic but will a DC solenoid have 0 Ohms impedance when energized? For example, a valve in the closed position with 24VDC applied to the solenoid. Don't inductors have zero impedance for ...
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Will nanochaff of radius 5nm act as an electrical conductor for the purposes of jamming radar?
I was reading a great paper about nanochaff recently and I was wondering how small it could be made while still diffracting in the radio spectrum. Does anyone know if 5nm diameter chaff would still be ...
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Can wireless charging become more energy efficient?
I've stumbled upon a few articles saying that wireless charging takes more energy to charge something compared to the cable. Like this one.
Like in the test from the article, it takes 47.33 % more ...
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High speed linear actuator/motor design
I need to make a linear actuator to compress a spring 80mm in 0.1 seconds. This is a speed of 1600mm/s. It takes around 15kg of force to compress the spring. How can I design a linear actuator for ...
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Test method to find out the nominal voltage of an Electromagnetic Clutch?
Is there any (non-destructive) test method to find out the nominal voltage of an Electromagnetic Clutch?
I have an Electromagnetic Clutch from an very old machine that came for restoration, and there ...
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What are the protrusions on the side of some electric motors?
The question is straight forward. What are the protrusions attached to the main cylinder of this electric motor?
This one has two protrusions that are the same size. Others, like the motor for my ...
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Can an arduino display pixel art I make on my phone?
I'm planning on trying to make an app or use something like Blynk with a Seeeduino Board that supports Bluetooth to see if I can make the board display something I draw or type on my phone. Example ...
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What are parameters are to be considered while selecting Battery Management System?
what are factors to be considered while selecting bms? Does the BMS required change with cell chemistry and cell geometry? if yes, how does it depend. and also How do we determine the placement and no....
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S-Parameters and Received Power for Implant Antenna
I am simulating an implant antenna using the Ansys HFSS EM simulation tool - the simulation setup looks something like this, with a transmitting (TX) antenna of transmit power $P_{TX}$ and transmit ...
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How widely used are "classic" high-Tc superconductors?
Are there good examples of the "high temperature" superconductors developed since the late 80s being used commercially? These only work at temperatures that are high relative to liquid ...
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Design of a 3 Phase Linear Induction Motor
I am a Mechanical Engineer but need to use a 3 Phase Linear Induction Motor (LIM) for a MagLev project.
To demonstrate the working of LIM I need to design LIM for accelerating a 10 kg payload to ...
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Question about time system of first order system
can anyone plz explain this next step? how this has been done
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Automatic dishwasher opener
I have a Beko DFS28021X dishwasher. Unfortunately, it cannot open its door when the washing is done. I thought that this could be fixed using a stepper motor and a phototransistor (to detect the "...
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Examples of uses of different voltages as seen on motor nameplate
The electric motor nameplate (pictured) has a variety of different voltage configurations which are listed. I understand that the motor can be configured to run on different voltages by changing the ...
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Thermal cameras - what is the practical significance of NEDT in relation to accuracy?
(Hi, I put this question on the elec eng. stack exchange and someone suggested I move it here. This question has also been edited to make the actual question clearer and fix an error).
Using accuracy ...
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