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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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12 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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24 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
29 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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Can a motor work within the center of another motor without magnetic interference or confliction on the rotors?

I'm imagining if it's possible to design a motor within another motor without having the magnetic field produced by one interfere with the other or their effect on the rotors conflicting? Can it be ...
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28 views

Convert Sankoo electric steam steriliser and drying machine to food dehydrator?

I have a spare Sankoo electric steam steriliser with drying functions and I want to convert it to a food dehydrator? Is this doable? How can I do it? It consumes ~150 Watt with the drying function ...
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20 views

How can I build a boot warmer? [closed]

I'm not going to build a boot dryer. Actually, I want to make a boot/shoe that is going to be warmed by the elements around the boot/shoe. At first, the elements need to be flexible because of the ...
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0answers
15 views

MCCB Trip during changeover

I have serious issue in my apartment. When the EB switch to DG, then DG switch to EB, MCCB will trip. Then i need to manually, go and move the main switch in ON position, to resume the power. No ...
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1answer
51 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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0answers
24 views

Calculate Roll from gyroscope (or fusion gyroscope with accelerometer)

I am working on a method to get the roll angle, while a device is moving. When I place my phone (or IMU) on a flat surface, it shows 0° roll angle. The problem is, if I make a lateral movement, the ...
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1answer
36 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
18 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
46 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
28 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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38 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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32 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
20 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
20 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
32 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
25 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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0answers
35 views

Why a zero too close to the imaginary axis gives bad berformances?

I am studying control systems, and I have found that if I consider I control scheme where I filter the reference , if the zero of the pre-filter is too close to the imaginary axis, we have a ...
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0answers
22 views

Nominal voltage ratings in Brazil?

What are the nominal voltage ratings and operating tolerances for 60-Hz electric power systems above 100 volts up to a maximum system voltage of 1 kV in Brazil? I am looking for a document like ANSI ...
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1answer
42 views

Dictionary of standardized engineering terms?

I think I once used a dictionary of engineering terms that was either a European effort or one of an (global) international standardization body - but I can't remember...
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1answer
40 views

What will happen if we place a couple of separate, small stators around a long rotor instead of 1 large stator around a short rotor?

My original theoretical consideration was using the electric motor's rotor as drive shaft in a car. It led me to this question: "What will happen if we place a couple of separate, small stators around ...
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1answer
67 views

Driving Gearbox in Reverse

https://www.maxongroup.com/maxon/view/product/251601 https://www.maxongroup.com/maxon/view/product/gear/spur/gs45/301171 Consider that this motor-gearbox combination is backdriven so that the motor ...
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0answers
17 views

Complementary sensitivity function in waterbed effect

I am studying the waterbed effect in control systems, and so I have studeird that from the Bode Integral, if I increase the sensitivity to avoid low frequency disturbances, I have amplification of ...
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1answer
46 views

What 's the function of COMP pin(Pin 3) in LM5030 - Push Pull IC?

I'm a student. Now, I am learning to use LM5030 IC to design a Push-Pull converter. So, I read LM5030's datasheet and can not understand the function of COMP pin (Pin 3). The red line is Feedback ...
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29 views

DC Motor with a power supply. How to handle regenerative braking?

I'm currently trying to build a balanced inverted pendulum using a reaction wheel. I bought a motor (12V max 30A), a motor driver (Cytron MD30C) and a power supply (0-24V 30A). My problem is when the ...
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1answer
41 views

Impact of Gearbox on Motor Inertia

If you consider a motor attached to a spur gearbox with a reduction ratio of say $r=50:1$ which is then back-driven so that the motor acts as a generator, what would be the effective moment of inertia ...
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0answers
35 views

Why does this magnetic charger cause short circuit when it sticks to the metal leg of my table?

Recently, I have bought this product. It is basically a USB cable, with a magnetic end, and a tiny attachment that goes into the mobile device. I plugged it into my laptop cooling stand (which has ...
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2answers
101 views

Embedded C Programming

I am currently a project intern, working on Light Fidelity (Li-Fi). Most part of the project deals with development of software for Renesas Micro controller. I have a simple doubt regarding timer and ...
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1answer
39 views

Limitations on the control effort

I am studying the mixed sensitivity design for control systems, and I have seen that the control effort has limitations given by the bandwidth of the process and by the bandwidth of the sensitivity ...
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0answers
21 views

Control effort in mixed sensitivity design

I am dealing with mixed sensitivity controller design in SISO systems and I am comparing this approch with the classic approch. In particular, I have placed a weight for the sensitivity function in ...
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0answers
21 views

PWM -electronic solenoid valve

I want to control the flow of chemical proportionate to the forward speed of the vehicle( if the speed is more discharge is more vice-versa). Need to integrate vehicle speed with encoder and control ...
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0answers
12 views

Design concept, how to power a guage?

I have a 12V battery that I want to monitor using a fuel gauge IC, should the fuel gauge be powered by the 12V battery? Or something else? (can you please provide an example if so?)
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16 views

Why is it desirable to have high g value for sensing applications, while high d value is desirable for actuation in piezoelectricity?

In piezoelectric materials, two parameters are defined to construct relations between electrical and mechanical energy conversions. These parameters are the charge constant d and the charge constant g....
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0answers
25 views

Problem reading control effort frequency response plot

I am trying to plot the frequency response control effort of a control scheme in Matlab, and in particular I want to do this for different values of tau, which is a constant used to add a pole at high ...
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1answer
16 views

I just learned about signed magnitude ,1's complement and 2's complement representation and I want to make sure that I understood them

So if I have the number 17 ( 8 bit code), the signed-magnitude representation is : 00010001 For -17 : 10010001 For 1's complement 17 = 00010001 For 1's complement -17 = 11101110 For 2's complement 17 =...
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1answer
52 views

Problem with performances of a control scheme

I am trying to prove with Matlab that if I have an improper system and I place poles at higher and higher frequencies the performances of the system improves. In particular I am considering the ...
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0answers
24 views

Design op-amp circuit from transfer function

What is the best way to design a circuit based on the following transfer function: 9216 / (s^2 + 48s + 9216)
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1answer
36 views

Why large industrial units combine induction and synchronous motors?

We usually use induction motors to turn electrical energy to mechanical, however synchronous motors are the machines on the other side of the grid (generation). A week ago we had a student visit to ...
2
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1answer
32 views

Fourier serie signal approximation

I have to approximate the red function with Fourier harmonics. I am calculating complex Ck the following way. I am not sure what to put for period - T (6 or 2pi or what?). What integral limits to ...
3
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1answer
112 views

How do I transition to legit freelancing, coming from a background of unethical projects?

I am a recent electronics engineering graduate, currently legally working as an embedded software engineer in a company. In the future, I would like to become a freelancer, like signing up on a ...
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11 views

Standing wave node counter

I have a an assignment to complete this Term, the assignment consist in making a machine that would produce standing waves in various frequencies, (for example the typical motor connect to a string ...
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2answers
35 views

Voltage at node A respective to the ground

I want to calculate the voltage at node $A$ respective to the ground. $R_1=1.8\text{k}\Omega, R_2=3.8\text{k}\Omega, R_3=1.8\text{k}\Omega, R_4=5.8\text{k}\Omega, R_5=2.4\text{k}\Omega$ and $V1=4.3V, ...
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2answers
44 views

Designing a loaded voltage divider?

I was wondering how to design this circuit in depth, since I have no idea what to do.
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1answer
52 views

Circuit analysis, voltage in and voltage out

I want to solve $V_o$ in terms of $V_i$ from the following circuit. $R_1=95.7 \Omega, R_2=9.1 k\Omega, R_3=1.0 M\Omega$ So the solution is form $V_o=kV_i$ and I want the factor k. I know that:...
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1answer
62 views

Why is it bad to run power through BNC (RG58) cables?

A standard practice in many academic labs, which I'm told is "bad practice", is to use RG58 cables (i.e. standard BNC cables) for power distribution. Question 1: Why is this considered bad practice?...
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1answer
48 views

Can the core of electrical transformers be made solely from copper?

Most electrical transformers that I am aware of have either copper or aluminum cable wound around an iron core. Can the iron core be replaced with a copper core? Would there be any performance ...
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1answer
30 views

Why do pitching machines use wheels and not solenoids, actuators, servos or peumatic cylenders?

I guess that generating movement is harder then keeping a wheel rolling, but in terms of power consumption is it possible to compare the power consumption of a motor for driving wheels to that of a ...
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1answer
42 views

How much rain water run off do I need to power an LED greenhouse

My question essentially is how much water to power green house LED lights. Specifics bellow : Say I have a warehouse with a flat roof with a bunch of water tanks or the whole thing being a water tank....