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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7 views

Melt plastic powder bed with radiant heat?

I want to melt a bed of plastic powder so that the powder bed once melted and then cooled forms a solid sheet of plastic. In order to melt the powder I'm thinking of passing a nichrome (Ni80/Cr20) ...
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What motor is best for 20kg kart

With the driver the total weight is roughly 80kg. I’m trying to build a drift tricycle and was wondering what sort of motor I should be looking at. I Plan on having a 2:1 ratio to double my torque. ...
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Backstepping control of second order nonlinear system

$\dot{x_{1}}=x_{2}^2-3sin(x_{1})x_{2}$ $\dot{x_{2}}=x_{1}^3-3x_{2}cos(x_{1})+u^\frac{1}{2}$ Question: Using the backstepping method and Lyapunov function, design the controller(u) that will make the ...
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Why isn't an all wheel electric steering system used?

If we had electric motors at each wheel and micro-controller sending them power, through an electronic speed controller, one could easily make left and right turns simply my decreasing, or increasing ...
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0answers
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How to calculate the min/max temperature output of a Thermoelectric Cooler (TEC) Module?

I'm characterizing a temperature regulated bath that uses TEC modules. I unfortunately do not have access to the bath due to the lock down situation, and have now turned to doing some calculations ...
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5answers
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How do electric companies supply electricity to homes in countries where energy is privatized?

Before I start, sorry if this doesn't make sense English is not my first language. In my country electricity is nationalized so there is only one energy company and one grid. When you build new ...
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3answers
63 views

When an elevator has two buttons next to it, ^ and v, what do they actually mean?

Both as a kid and as an adult, I've encountered elevators lined up next to each other, or single ones, which have two buttons on each floor (outside of the elevator): ...
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1answer
48 views

Running a well pump rated for 230V on 208V power

I have a well with a 1.5 HP pump. The pump is rated for 240V input. At the moment, the only nearby available power is 4-wire 208Y 3phase. I am considering connecting two of the three phases to the ...
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1answer
37 views

how to determine how much speed a motor will produce under load?

I am working on a one-wheel project, I would like to use an electric go kart motor chain driven to a 30 cm diameter wheel and get 90 kg at least 13 m/s with an acceleration of 3 m/s2, I ...
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4answers
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Why do color TVs make black and white snow?

If you let a color TV display something from an unplugged display port, it displays snow, right? Randomly varying black or white pixels on the whole screen. My guess was that the television was ...
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Difference between derivative of Gyroscope data and (Yaw, Pitch and Roll) angles

I have just been reading through some feed but I honestly don't quite understand why a 3-axis gyroscope data would not be the same as the roll pitch and yaw angle. I am working on a project which ...
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2answers
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What are these outdoors “mystery boxes” for in the USA?

While watching random videos shot in the USA (in the present time), I've noticed these little weird outdoors boxes: What is the purpose of these? They look like they might be related to ventilation ...
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Find nodal voltages for an electric circuit (engineering circuit analysis 8th edition practice problem 4.5)

The question is to find all node voltages. I thought I made all the right steps, however the textbook has a different answer. I hope you’d be able to point out my mistake. $\ v_1 $ is $\ 3V $. What I ...
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2answers
37 views

Chemical engineering equivalancy to the spring-mass-damper/RLC circuit

I understand the equivalency between the MSD and RLC circuits. Mass ~ resistance, spring ~ inductor, damper ~ capacitor. With the equations of the form MSD: $$ m\ddot{x} + c\dot{x}+ kx = F $$ ...
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Wobbling DC motor head

I have used 250 watt DC motor, for DIY electric potters wheel. Motor rated with RPM 3300 and geared reduction to 330 RPM. The issue I am facing is wobbling of the motor head. This issue is with the ...
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1answer
47 views

What motor torque specs that is suited for a horizontal to vertical 90 degree lift?

I have this simple design to lift an access door, but I am looking for the motor specs to do this heavy duty job. This is a simple design, I have added some information of the time, length of the part ...
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22 views

Best way to go about “HiPot” testing setup

What is the best way to set up a dielectric strength test? I am planning on using two threaded copper rods for adjustable movement that will receive the voltage. In between the two rods will be the ...
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1answer
27 views

How to predict out wavelength emitted from gasses

I'm trying to figure out which gas emits a specific wavelength when excited. Say I want to develop an LED that emits a certain wavelength. How would I figure out which gas emits that specific ...
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4answers
84 views

How do you create a negative and positive voltage(-6V and 6V) with a singular voltage source?

I'm trying to use a battery to activate an op amp schmitt trigger but learned that there needs to be both a positive and negative voltage supplied to Vcc+ and Vcc-. I've seen a lot of schematics ...
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4answers
80 views

What sensors/methods can be used from the roadside to determine if a truck is loaded or empty - without weighing it?

What sensor, using what physical principle, can penetrate a closed rectangular object like the trailer of a truck and tell if the space is empty or loaded? Why is this question relevant? One of the ...
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1answer
24 views

Bar heater operating on a duty cycle - possible problems?

It's easy to obtain a room-scale radiant heater (of the order of 700-800W per bar, eg this three-bar heater) that operates very simply and easily - you turn it on, it consumes electricity, it ...
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1answer
40 views

Heating tape that has leads like picture below

Does anyone know where I can find Heating tape that has these same leads or know what they are called? It is meant to be plugged into the second picture attatched.
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3answers
35 views

Design Input: Rotary motion to Linear motion, What system should I choose?

I am posting this here because of the multidisciplinary knowledge needed to tackle this issue. Problem: I have to make an electromechanical device that is required to have controllable (downward) ...
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2answers
55 views

can base current be far less than collector current?

I'm using an NPN transistor to pull the gate of a P-channel FET low. I'm driving the base with 3.3v and a 10k series resistor. I have a 100k resistor in series with the collector and the gate of the P-...
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1answer
23 views

How is the most basic display driven?

I am curious how taking the most basic display such as this OLED one that works with the ardunio is driven: i.e. We are using just a clock and data line to drive a 128x64 pixel display. The pixels ...
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25 views

Extreme temperature quick disconnect terminals

I am doing R&D work and am in need of terminals that can withstand 1,000 degrees Celsius, but cannot seem to find anything anywhere. The highest temperature ratings I have found are around 600 ...
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1answer
44 views

why is there a lead (Pb) warning on extra heavy duty batteries?

I have some batteries labelled as Extra Heavy Duty with a picture of a trashcan and the letters Pb for lead, and an x over the trashcan which I believe means not to discard in the trash. The ...
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1answer
27 views

How is digital image-data converted to a laser projection in laser printers?

By laser projection I mean the laser beam that is projected onto the photosensitive drum in the laser printer. The printer receives digital image data from a computer processes it and projects it onto ...
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16 views

solving short electricity interruptions with an UPS

Context A plastics factory with installed power of about 500 kVA. Most of the consumption is represented by motors and resistances. Problem There are several (8+ a day) power interruptions, lasting ...
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1answer
44 views

How does dynamic braking work with railway locomotives?

General Electrics boasts that its Evolution series diesel-electric locomotives are capable of dynamic braking. Dynamic braking uses the electrical traction motors on the locomotive axles - motors are ...
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1answer
43 views

BJT Output Characteristics Question

Ok, so I am pretty confused at the moment with a question that I have been given to work out by my lecturer and was wondering if I could get some guidance with it. I will attach images of the question ...
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1answer
31 views

Does the voltage rating on transformer plates account for losses?

According to basic electrical machinery theory, all transformers experience power losses due to winding resistances, eddy currents, leakage flux and hysteresis. So when a load is connected to, say, a ...
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1answer
22 views

Emulate normally closed relay with 2 normally open relays

Good afternoon, I have recently ordered a normally closed relay to fix on my car's daylight-running lights. When the main lights come on the DLR should switch-off. Unfortunately amazon has delivered ...
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1answer
39 views

What are the drawbacks of inceasing the bandwidth of the system?

I have a doubt concerning the closed loop frequency responce of a control system. Suppose I have the following situation: in which is plotted the frequency response of a system with different ...
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1answer
21 views

Problem with RHP zero in transfer function

I have a transfer function with a RHP zero in $s=+1$, and I am trying to show in Matlab thath this limitation is present. In particular, initially I had a MIMO system, which I decoupled and then I ...
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1answer
43 views

Do kids under a certain age not hear the warning beeps that smoke detectors make when they are running out of battery power?

I've always been very annoyed by those regular single beeps that smoke detectors start doing increasingly often as the batteries start to run out, to warn the user to replace the batteries. Lately, I'...
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1answer
29 views

Simple negative ion detector circuit?

There are the "consumer" negative ion detectors which are about 50 USD, reviews appear to indicate that they are not measuring very much at all. Then there are the professional ones which are $800 ...
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0answers
27 views

How can I find the length of 12 gauge wire needed for a cone of if I know it's surface area

So I'm working on a personal project, and I need to figure out how much 12 gauge wire (which is ~2mm thick) I would need to cover a cone shaped rubber core, which has a surface area of roughly 3,417,...
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1answer
30 views

Question about flow temperature and storage temperature in a cogeneration plant

Let's assume I have a cogeneration plant that produces heat with a nominal output. The heat is given into a heat storage tank, which is filled from above. The maximum flow temperature of the ...
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1answer
70 views

Calculation of the specific CO2 emission of a cogeneration plant for the produced electricity

Suppose I have a cogeneration plant that runs on natural gas and produces heat and electricity. The heat effeicieny is $\eta_{th} = 0.4$ and the electricity efficiency is $\eta_{el} = 0.4$. The ...
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1answer
38 views

Limiting PID controller's output making the plant unstable and untunable

I am using the PID block in Simulink and limiting the output to (+/-)5. The plant becomes unstable and untunable after putting these limits. The plant is stable and tuneable otherwise if no limits are ...
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1answer
22 views

Which gerber file to use for pcb maker

I have a PCB maker at school, but no one really knows how it works, because it's a pretty old thing. I asked for the instruction manual and it turns out, the manual is also pretty old. If i want to ...
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1answer
63 views

Optimal control vs. nonlinear control

I have tried to compare between two courses, and there seems to be some overlap, but not as much. Which method is better when controlling a nonlinear system? Also, what is the main difference between ...
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2answers
34 views

Finding replaceable push pull transformer with similar specifications

I am a student and is making power project using Push-Pull transformer. I used the Reference design: TI Designs: TIDA-01352. I stuck to find 2 replaceable Push-Pull transformers as in suggesting ...
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0answers
39 views

Understanding transformer secondary winding

I purchased a step down transformer from a junk yard. I tested the transformer and it works but I am confused as to the secondary winding. The primary side has these markings G 0V 100V The secondary ...
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0answers
58 views

How can I calculate overcurrent from over voltage for the AP9101C IC

I designed a battery charging, protection, and boost circuit for a project I am working on. However, I made a complete noob mistake and forgot to find the overcurrent value for the battery protection ...
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1answer
23 views

Motor control sounds

I’m curious about the sound made by some types of high powered electric motors and related control devices. Many (but not all) large electrical motor systems make high pitched sounds that correlate to ...
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2answers
21 views

Electric Arc Furnace Steam Production

How much steam is emitted from an electric arc furnace in a unit of time? I have not been able to find any data on this which is strange considering the amount of water that is used to cool an ...
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1answer
35 views

What's the function of those coils there?

What do they do? The aux contacts are normally open and the device is MR PQM 500 reactive power compensation system.
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1answer
45 views

AC Motor On/OFF Control using SSR instead of contactor

I would like to control a 1-phase 3HP motor using a SSR ( the reason being, I need to switch it on/off using a signal (0-5VDC). Are normal SSRs (ex:Fotek 40A model) capable of handling the starting ...

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