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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34 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
56 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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12 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
33 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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26 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
39 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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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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1answer
35 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
11 views

Calculate Scattering Parameters - RF Circuits

Can someone explain how to calculate scattering parameters for the circuit pictured. I need s12&S21. The answer is 1/3 but don't know it's obtained. s11=s22 =1/3. Za = 50 ohm Zb = 50 ohm Zc = ...
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20 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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20 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
11 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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21 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
47 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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22 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
31 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 ...
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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
43 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
57 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
47 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....
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31 views

How to obtain transfer function of servo?

I am using a servo motor and controlling it via arduino. Servo motor is part of a control system and I have to use System Identification techniques in order to obtain the servo's transfer function. ...
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1answer
35 views

What is the voltage at the ground electrode of a spark plug?

Since the voltage required to bridge the gap between the central electrode and the ground electrode of a spark plug can reach up to 40 000V and even more, my question is, how does the battery not die ...
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0answers
20 views

P-N junction depletion region

Before I explain my problem I'd like to mention I'm still green and about 2 weeks into these topics. I learned most of it from youtube videos, wikipedia and other science sites, so I'll be explaining ...
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1answer
42 views

Constant force opposing hydraulic winch

I have a situation that I am hoping to solve with the use of electric motors, and a variety of controls. I have a hydraulic winch which turns at speeds from 0-60 RPM. This winch is coiling and ...
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0answers
26 views

small touchscreen for handheld instrument

I'm trying to find a small approx 2.5" touchscreen display that would be good for utilization in a small battery powered handheld instrument that has a frequently updating value that it reads. e-ink/...
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0answers
19 views

Confusion about 2-bit adders

I am a little confused about how a 2-bit adder works. For 1-bit adder, my understanding of it is fine and I am able to draw out the truth table for it. However, if lets say I have a 2-bit adder, I can'...
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0answers
23 views

value of $\gamma$ in the H-infinity norm

Suppose I have the system: $\dot{x} = Ax+Bu$ $y=Cx+Du$ and the following Hamiltonian matrix: $H=\begin{pmatrix} A & \frac{1}{2}B^TB\\ -CC^T&-A \end{pmatrix}$ I want to find the value ...
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56 views

How to add external sensor data to pictures, canon DSLR, hot shoe, electronics

Here's a challenge - I am trying to add different sensors data (height,temperature,distance by laser) to pictures i take with a canon DSLR camera. Would it be possible to connect different sensors ...
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1answer
37 views

How long do external hard drives and the data they contain last?

How long do external hard drives and the data they contain last in case of lack of any use after downloading the data and the condition of storage having a room temperature, average humidity of 60-70% ...
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0answers
20 views

RC Bandpass Filter on pspice :unity gain frequency

I am simulating a pspice bandpass RC filter by cascading 2 opamps one HP and one LP. I am getting this bode plot at the end. Is the unity gain frequency the 2 frequencies at 0 dB?
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1answer
47 views

Electronic symboles in datasheets

I found these symbols in a electronic datasheet.. Are these all logic gates? or another?
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1answer
18 views

Flat Fading vs Selective fading, which one is better?

I come from Maths background, but recently I encountered problem where a channel is described as "flat fading channel". I would like to make some conclusions based on that fact. I suspect that for ...
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1answer
29 views

Cannot understand an equation related to impedance. (Power system analysis)

Can someone explain how can we find |Z| term and also from where does the cosine term arrive at the final equation.
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0answers
27 views

Please help me with 2-D Dynamic analysis in ANSYS Mechanical APDL

I'm trying to do dynamic analysis of an electric motor using Ansys Mechanical APDL. The stator has 4 pole pairs and only 1 of them has windings. The rotor has 3 pole pairs with no windings. I want to ...
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0answers
62 views

Help with Engineering Mathematics, Struggling to determine coefficients using methods detailed in this research paper

I am struggling with a curve fitting calculation below. the part I am stuck with is arguably the simplest part, which is determining the coefficients $\\K_3$ and $\\K_4$. It seems like it should be ...
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29 views

Solar power, Battery power to mains voltage

My question is what is the most efficient way to convert 48V D.C. to 220V A.C. Not the easiest or most cost efficient but the most efficient electrically? Also if anyone has any cheats on the best ...
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2answers
47 views

oscillation motion from DC motor (computer fan)

I intend to make an oscillating motion from a simple computer DC fan (say 5V). My question is: could a signal generator with a sinusoidal signal of (say voltage 5V and frequency of 5 Hz) be used to ...
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1answer
43 views

Why are FBG sensors recalibrated every 10 years?

So, I am working with FBG sensors and I have read that those sensors need to be re-calibrated every 10 years to get accurate measurements. But no where on the internet (AFAIK) is it explained why ...
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1answer
59 views

How to drive 12V servo motors using 5V PWM or 3.3V PWM using ARM MCU?

I have to drive several 12V servo motors. So I wanna to get 12V PWM Controller (12V Logic Controller). I have MCU as Atmel SAM3X8E arduino due board. It has 5V PWM outs. Is there any Controller IC ...
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0answers
13 views

74141 BCD-to-decimal converter lighting wrong/multiple LEDs [closed]

I'm having trouble with a 74141 IC while building a nixie clock. At the moment I'm testing it with 10 leds and a 4K7 resistor, expecting them to light up one at a time as per schematic: NTE74141 ...
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1answer
38 views

What's the point of ESD-safe tweezers?

ESD-safe tweezers have a black coating on the handle. If I am grounded to a work bench, and normal tweezers are already conductive, then what is the point of the conductive black coating? Screw ...
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1answer
56 views

Controller vs Micro controller?

We often listen both term in electrical engineering? First one is seen in control systems course and second one in course of embedded systems But what is difference between both of these terms?...