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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What would be the efficiency of dielectric elastomers if these were made with copper wire instead?
My apologies if this isn't the right Stack to ask about dielectric elastomers, but I couldn't find any other search result on other stacks about dielectric elastomers, except here.
So, no matter how ...
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First order dynamics of tyre parameters identification
I am looking for methods to determine relaxation length (or time constant) of a tyre for a bicycle model vehicle.
the equation describing the dynamics of tyre force is a given as follows:
tau.dFij/dt =...
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Strange problem with Impedance?
I've encountered a strange problem with a 12V key-fob device. We use a device to remote control a relay via a key-fob transmitter. It's installed in a plastic box that is mounted at an operator ...
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How do I wire up this Single Phase AC Motor? (Wye Arrangement)
The no-volt-release switch stopped latching on my single-phase planer thicknesser. The motor is under 1.1kw (1.5hp) and I understood that I would be able to drop in a generic switch.
However now ...
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Do oppositely charged fused spheres align in electric fields
Molecules in solids get polarized and the resulting dipoles align with the external bias field. Can this be done with lightweight spheres that are oppositely charge on their surfaces? Like surfaces ...
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Is Isolated Barrier Necessary for Equipment with Hazardous Area Certification Ex e ib mb I IC T6 Gb?
The equipment holds the certification Ex e ib mb I IC T6 Gb, where "ib" signifies intrinsic safety. This certification confirms that the equipment is specifically engineered to restrict ...
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Simulation of the direct piezoelectric effect using FEM
I have to simulate the direct piezoelectric effect, i.e. the generation of electrical charge under an applied mechanical strain using FEM with FEniCS. My geometry is a freestanding quadratic prism (a ...
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How can I calculate power dissipating through a Eaton moulded circuit breaker?
Excuse my English. I am trying to figure out how to calculate the power dissipating through a CB by Eaton. Not much info is given on resistance.
Assuming I selected a 250 CB, how can I calculate the ...
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Entropy change in particle electric dipole alignment
Suppose a bunch of micron sized particles are charged positively on one half of their surface, and negative on the other. If they are arranged randomly, I understand they will have high entropy, as ...
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How to measure linear displacement in real-time?
I'm trying to sense the position and orientation of an object in real-time using an Arduino. I'm able to measure orientation with ease using a 9-DOF IMU.
I cant seem to figure out how to measure ...
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Does triboelectric generator made with powder and wire mesh work?
One of the greatest challenges for triboelectric generators is surface charge, which ultimately depends on surface area. Why don't we make one triboelectric layer a powdered form and a crazy forest of ...
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Is a matrix a control system with memory?
In control systems, a system is said to have memory if the output is dependent on previous inputs. By that definition, is a matrix of arbitrary dimensions a system with memory? (I am new to controls.)
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How does the magnetic field in a synchronous machine with two pole-pairs distribute if I only apply DC-voltage on two phases? (Star connection)
I am struggeling to understand the following:
If I consider a synchronous motor with only one polepair and apply dc-voltage to two of the three phases this results in a static magnetic field.
The ...
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Why is the 8085 microprocessor not provided with a G register?
I know that there are 7 general purpose registers( A,B,C,D,E,H and L). I am told that F is missing as F is said to be corresponding to flag register but I am not able to understand why they left out G....
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What are some ways to produce a pre-determined sequence of a large number of dice rolls?
What are some ways to produce a pre-determined sequence of a large number of dice rolls (on the order of 100-1000 times) using biased dice or a biased human roller given the constraints that multiple ...
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Amplification of the P-component
Given again in this simulation is an unknown system. This time the excitation source is not known. In addition, the P, I and D components are not shown individually in the scope, but summed up.
are ...
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Matrix Calculation
I would like to Calculate Q. The transpose of U matrix is a 2x5 matrix and U is a 5x2 matrix. Therefore, I was expecting a 5*5 Matrix, which wasn't the case. Can someone please help me to solve Q
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How can I keep a low voltage electromagnet on continuously for long durations of time?
Background
I have an application that requires an electromagnet (either 5v or 12v) to be powered on for long durations of time (up to a few hours). While looking for one online, I was having a hard ...
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Selecting microprocessor for microcontroller
I have decided to build my own microcontroller.I will also create a IDE in Python or C to be able to program it.I am in the process of selecting a microprocessor.I have looked at some microprocessors ...
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Error Equation of a Control Loop
I want to calculate the error of a control loop. Therefore, the system and the general processes and models are defined as follows:
The equation for error is described as follows:
I do not ...
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How to observe open loop characteristics with loading conditions?
I have derived transfer function of a dc motor (armature controlled). Its input is armature voltage and output is speed of motor in rad/s. How do I observe open loop characteristics with an external ...
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Does static electricity dissipate if object is sealed in insulator sphere?
I rub a piece of glass against some silk. Normally, left in open air, it would lose its acquired charge. What will happen if after rubbing, I immediately seal it inside a sphere made of insulator ...
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How to identify electric motors, find pinouts, etc
This is my first question here so I apologize if I do anything wrong in making this post.
I recently pulled the electric motors out of two junked home appliances (a 120v clothes washing machine and a ...
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Why does a car generator employs an alternator (i.e. AC) when power supply is provided by a battery (i.e. DC)?
An alternator generates AC current, whereas batteries (as far as I know) provide/are charged with DC current. So I'm wondering, how is this apparent mismatch explained?
Do car manufacturers employ a ...
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stepper motor rpm speed with different step angles
I am wondering if two stepper motors with different step angles - one 0.9 degrees, other 1.8 degrees would have the same speed (rotations per minute). I assume all other parameters are the same.
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Why use batteries in series if voltage booster circuits exist?
I recently saw some DIY battery builds and something has been bothering me. So for example in one of the builds they needed 14V nominal so they put together 4x3.7v batteries in series so they achieved ...
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Using voltage inverters as voltage boost converters
So recently in one of my circuits I needed to have a -5V power supply, so I used a voltage inverter IC to get -5V from 5V. And the voltage across 5V and -5V is 10V so basically the voltage has been ...
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What is the intuitive explanation for why a system can be stable with a negative gain margin?
Beyond the math which shows that a gain of -1 and a phase of -180 (G(s)=-1)causes instability when the open-loop TF is taken to closed loop, the way I've always justified the instability of G(s)=-1 ...
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Find the series {$a_i$}$_{i=-\infty}^{+\infty}$ - Linear system course
I have a question. this is sub-question D:
Let $T${$x(t)$}$ = \int_{-\infty}^{t} [x(\tau) - x(\tau - 1)]d\tau$.
Consider the signal $x_3(t) = a_i, \forall t \in (i,i+1]$ and $\forall i \in \mathbb{Z}$....
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Alternators working parallel with a single neutral
I read a few articles on why neutral points of two alternators running parallel should not be connected to avoid circulating currents caused by difference in alternator windings and kind of understand ...
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Studio Monitor's Cone not making sound after playing loud music through it
I was playing some very loud pop music through a studio monitor (ADAM A8X), and after about 5 seconds the sound stopped coming out of the cone and only came through the speaker. After shutting it off ...
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How can I control my vehicle’s electric power steering system?
I’m trying to add lane keeping assist and adaptive cruise control to my 2017 Chevrolet Camaro, with the ultimate aim of using Comma.ai’s openpilot (or some other fork) to make my car drive itself. ...
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Wind triboelectricity shakers in series
I've seen shaker generators made with small plastic hemispheres with aluminum foil stuck on inside both, and a small ball wrapped in tape put in and sealed up. Then the shaker is vibrated and it ...
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Minimizing the MSE with symmetric scalar quantizers
Let $X$ be a scalar random variable with pdf $f(x)=e^{-2|x|}$. Among the class of symmetric 3 -point scalar quantizers find one which minimizes the MSE in quantizing $X$. Compute the MSE in this case.
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What causes a correctly sized circuit breaker to trip?
I have a suicide shower head and even though the breaker is correctly sized it trips after about 6-8 minutes of showering.
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Cooling capacity of sealed aluminum electronics enclosure
I need to design a sealed electronics enclosure that also functions as a heat sink. The main component I need to cool generates max 15W. This component will directly contact the walls. The remaining ...
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Probability of kitchen toaster breaking
does anyone have any data on the probability of a kitchen toaster breaking such as mechanical or electrical faults?
For a school project- teacher put me in charge to find this
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Is there an electrical analogue to mechanical fatigue with respect to dielectric strength?
Suppose I have an elastomeric specimen from a material sample known to have dielectric strength of, say, 15 kV/mm, as informed by previous dielectric strength testing. If I were to repeatedly subject ...
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Do any continuously-variable-speed electric motors use Alternating Current?
All the "energy-efficient" continuously-variable-speed electric motors I've seen in consumer applications (e.g., HVAC, water pumps – all motors producing on the order of one horsepower) ...
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What is the name of this power connector used in the USS Yorktown?
I found this in the USS Yorktown aircraft carrier (it’s open for public tours)
I know it’s a 3 phase connector of some kind, but what type of plug connects to it? Is it a nationwide standard or ...
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Does MEMS/Optical Gyroscope record Earth's Rotational and revolutional angular velocities
I am using a 3 axis gyroscope (Android device) to record angular velocities using a sensor data logger application.
When the device is placed stationary, the gyroscope recorded the following values:
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Building a laser-pointer array for my buddy's pool table
this is my first post here. I'm a software engineer by trade, but I have a 3d printer so that makes me a mechanical engineer, right?
Clearly not. However I do have some rudimentary skills and have ...
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Express method for economic evaluation of mechatronic devices
Are there quick methods for the economic evaluation of mechatronic devices that have not yet been widely adopted in industry, but are at the stage of prototyping and laboratory experiments?
Basic ...
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Calculate temperature of surroundings given heat source
Im designing a miniature 8" x 8" x 8" burnout oven, and I want to estimate what temperature it will internally reach given a set voltage and current.
For reference, its heating element ...
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Troubleshooting clipping
I am collecting data for a project, where I am measuring the room impulse response by playing a sine sweep from a speaker (QSC K8 1KW Active Loudspeaker) and measuring it from the other side of the ...
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Pumping machine (Centrifugal ) fails to pump
I have a centrifugal pumping machine that fails to pump up consistently. When powdered on, it spills up water, then stops and continues intermittently like that without a consistent flow of water out. ...
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How to pick transducers for an ultrasonic flow meter?
I am designing a flow meter with a team of students for a university project based on the time of flight principal. We are striving for a high accuracy. We are currently researching different ...
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Internal Stability and Small Gain Theorem
I am currently working on a MIMO feedback system and trying to determine its internal stability. The open loop gain of the system is stable and has no internal right half-plane pole-zero cancellations....
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Will providing below rated torque to a DC machine acting as a generator still allow it to rotate?
I'm working on a system that will generate electrical power from a mechanical input. If the mechanical input is unable to generate the required torque to meet the rated torque of the DC machine, will ...
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Smoked component on Lincoln 210 MP control board
Here is a picture of my Lincoln 210 MP welder's control board. I have a broken component, and have no idea how to identify what it is. I cannot find a board schematic, no information at all really. Is ...
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