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 kind of physics do engineers use daily? [on hold]

I am interested in areas of physics engineers use daily.
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10 views

Where in the UK can i buy s stator for this small DC 3 phase motor that i damaged while trying to extract it

I was trying to remove a stator from the housing and damaged it , hence am trying to find a new one but cannot find anybody based in the UK that I can get "customisable dimensions" from and none of ...
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9 views

Static charge, PVC pipe and water

I know it's possible for a PVC pipe to develop a staic charge due to fluids flowing through them. This is a twist on that idea. Can a sealed length of pvc (say 3.5 feet in length) - tethered below ...
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Are there any books which show how to design electrical coil heat exchangers?

I need to design an electrically powered gas heater, but i need to do so in detail. I'm looking for a guide similar to the shell and tube heat exchanger design guide in coulson and richardson's ...
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Actually real Iron man suit [on hold]

What other people have done: Many people have had this idea. For example Adam Savage's newest video "How Adam Savage built a real Iron Man suit that flies" They used a laser beam to melt the liquid ...
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3answers
79 views

Cheap electrical motor that can spin freely in both directions when unpowered

I am looking for a cheap (preferably under 2000 USD) electrical motor that can spin freely in either direction when the motor is unpowered. The motor will be used as an alternative source of power to ...
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1answer
32 views

LPF Second Order use cascade

What is the minimum value of $R_2$ (in $R_1$) to minimize loading effect? Please explain the concept.
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2answers
34 views

Integrator OpAmp

Tell me how can the 's' in first equation described with the 'integration' in second equation?
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1answer
47 views

Operational Amplifier

In this case, can I say that $V_E$ correspond to -0.7? if yes, why can this be?
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21 views

Can you convert the two equations into their block diagram representation in Simulink?

(Reference Material: Modeling & Analysis of Dynamic Systems) $$\begin{align} \ddot x_s &= \left(\dfrac{1}{m_s}\right)\left(P_0 - R_{s1}\dot{x}_s - K_{s1}x_s - R_{s2}\left(\dot{x}_s - \dot{x}...
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24 views

The speed of induction motor in matlab is starting from synchronous speed

The speed of the induction motor is starting from around synchronous speed. The speed should start from zero. What is the reason behind that?
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0answers
21 views

Tundish Lift Lower mechanism

I have two no of motors connected in parallel of 7.5 kw max current capacity 30Amps. The load is about 18Ton is the motor sufficient to lift this load. The mechanical arrangement of screw jack system. ...
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33 views

Starting of direct current Motor

what happens if starting arm of starter does not return to "OFF" position after a temporary supply failure?
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34 views

RMS value of fundamental component

I need help calculating the RMS value of the fundamental component of source current. The electrical circuit is a fully controlled single phase rectifier bridge. In the lecture the value is $$I_{RMS}\...
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3answers
61 views

What kind of plug is this?

Can anyone help me to identify this electrical connector set? Hint: One male plug style connector has some text saying "HC 0617 CANNON"
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1answer
40 views

How to design and make thermal inkjet print head / nozzles

I'm recently interested in print-heads, especially thermal inkjet print heads. I would like to design a simple print head with nozzles in a row with no chambers, but only a straight linear pipe-like ...
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2answers
39 views

What's the difference between pulsed lasers and frequency combs?

Can you please explain the difference between high-energy pulsed lasers and frequency combs?
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0answers
33 views

Finding Supply/Nominal voltage for Torque Motor BLDC

I'm a bit confused by torque motors datasheets as it never mentions any nominal voltage. I would like to run a torque motor on a 24 V battery. The required max torque is 150 Nm (=21000 ...
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27 views

Control systems to control position of antenna with motor?

I want to design a control system with microcontroller to control position or orientation of antenna with BLDC motor with high precision like 0.1 deg and I don't have idea which motor position ...
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0answers
29 views

Swapping transmitter and receiver locations

Pardon me if this is a silly question, because I don't quite study RF. Let's say I have a set of transmitter (radio + antenna) and a set of receiver (radio + antenna), at location A and B ...
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1answer
63 views

How do I calculate voltage at an LED in parallel?

I have this circuit: If D2 was a resistance, I could just combine it with R2 to get some composite resistance that I could put in series with R1. That way, I could calculate the resistance of the ...
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1answer
17 views

What is the material requirement for Van der Graff generator sphere?

I would like to make a Van der Graff generator for my science fair project out of aluminized mylar. Do you think this might be feasable or do I need to use thick stainless steel ball? Is there some ...
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20 views

Generator coils

If I am using a 9" long by 1" diameter coil for my generator, which way will be better to generate the most power? Slice the 9" coil into nine coils and connect them in series, or leave it as one coil?...
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12 views

Charger for lead-calcium battery circuit

I post it because I want to know if anyone of you see any error in this circuit made in proteus 8.6. I accept any observation, this circuit provide 12v of output and 3 modes of charging fast(15 A), ...
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1answer
16 views

How to contain air ions inside a chamber without loosing their charge?

I would like to create an experiment where I would hold ionized air molecules. Most likely negative O2-1 ions. I am looking for the most appropriate enclosure so that the ions do lose as little of ...
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1answer
46 views

How to find the smallest change in voltage

You are comparing different A/D converters that will have 3.2 V and -3.2 V as their positive and negative reference voltages, respectively. Out of the following, converter _ can resolve the smallest ...
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1answer
51 views

Is there a motor design where a rotor gradually moves into a stater?

I was wondering if there is a motor/generator design where the rotor moves gradually in and out of the stator along the axis of rotation, or the stator over the rotor. If so, I'd like some resource(s)...
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1answer
27 views

Hover Stylus for capacitive touchscreen

Capacitive touchscreens do not rely on touch as the name suggests but rather measure the distortion of the electrostatic field. To my understanding a touchscreen might be able depending on the build ...
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34 views

Second Order OPAMP circuit

I was trying to understand the way this problem was solved and I got confused with the latter part of the solution. I encircled the part that confused me. They seem to contradict each other. If $\...
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2answers
27 views

Why does a lead-compensator type system decrease to a step response

For example, the step response of $\frac{s+1}{s+2}$ is decreasing although its gain is +1, and this system has higher gain at high frequencies than low frequencies based on its Bode plot. But if I ...
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1answer
53 views

What is the appropriate type of controller for this system?

I am given this transfer function for a system: $T\left(s\right)=\frac{9.81}{s^4+0.5s^3+11.2815s^2+4.905s}$ Now, I want to design a controller that will make the closed loop system have an overshoot ...
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1answer
35 views

Implementing logic expression and the truth table of logic function

(a)Z=(B+C')A+B(C+D')+BD Z=AB+AC'+BC+BD'+BD Z=AB+A'C+B Z=B+AC' (b) A B C|Z 0 0 0|0 0 0 1|0 0 1 0|1 0 1 1|1 1 0 0|1 1 0 1|0 1 1 0|1 1 1 1|1 (c) BC 00 01 ...
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2answers
72 views

If gold is a worse electrical conductor than silver and copper, why are gold plated contacts considered “better” by the market?

I've always wondered if this is just a marketing thing, but all across the electronic supply spectrum I see "gold plated" listed as the best conductors for various contacts and connectors. However, ...
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2answers
66 views

Can you use an electromagnet to break the connection of a permanent magnet?

At first, I had a particular goal, but I'm starting to doubt feasibility which has led me here. Original Goal: Create a small (3in²) electromagnet with 100% duty cycle capable of holding at least ...
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1answer
141 views

What is it about the cabin electrical supply on cruise ships that makes surge protectors dangerous?

Surge protectors are banned on cruise ships, and so are confiscated during boarding. Extension cords and cube taps etc. are discouraged, but not banned. I'm asking specifically about surge protector ...
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1answer
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Measuring wire damage using strain gauges

We need to determine the physical damage in some area of overhead lines that can't be inspected visually. The damage's in general caused by short circuit and air pollution (mostly sulphur compound). ...
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1answer
32 views

Can a switched mode power supply for a neon sign be used for making lichtenberg figures?

I am trying to find a cheap power supply that will produce the high voltage needed to create lichtenberg figures on wood. I ruled against using a microwave oven transformer due to the high current, ...
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1answer
19 views

Difference between AD630 'Phase Comparator' and 'Lock-in Amplifier' modes

The datasheet of the AD630 mentions that the device can be used as a Precision Phase Comparator or as a Lock-in Amplifier. What's the difference? They both seem to map the amplitude of a modulated ...
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Power generation in combustion engine

Here's the problem: On the one end of low-speed engine (driving end) I can measure the torque transformed to mechanical energy. On the other end (free end) I'd like to join power generator with a ...
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1answer
59 views

Strange simulink error. Professor & TA don't know. Any Ideas?

I am currently working on developing a simulation for a restricted UAV, and I’m having some issues with Simulink while doing this. I have my mathematical equations which have been approved by my ...
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0answers
15 views

Why are Microbolometers uncooled?

i've read on several websites that microbolometer, unlike other low range infrared waves detector, does not requiere any cooling. I didn't find any explaination online. For me, the core principle of ...
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28 views

Name of protocol used to communicate with Fuelling Station Dispensors

I am trying to figure out the actual (Range of ) communication protocols used to communicate with Fuel Dispensers at fuel retail outlets. I see them write 2-wire protocol which is not specific as ...
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1answer
140 views

Basetech BT-305 missing resistor

I just modded my Basetech BT-305 laboratory power supply to become an IoT device. Everything works as planned, except the volt display in the multimeter-part of the supply, which is directly shown ...
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0answers
32 views

Can a Tesla Powerwall 2 be rate limited?

Can a telsa powerwall 2 be rate limited (discharge/charge)? I have access to realtime electricity rates (30 min update interval) and also access to 12 hour predicted look ahead. So I wish to limit ...
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2answers
94 views

Find the system response given the initial condition

I am given these sets of equations for a gantry crane: 1) $M\frac{d^2x}{dt^2}+D\frac{dx}{dt}-mg\theta =u$ 2) $ml\frac{d^2\theta }{dt^2}+mg\theta +m\frac{d^2x\:}{dt^2}=0$ 3) $y=x+l\theta $ Where $x$...
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42 views

Need help picking motor to wind a spool

The application is a motor attached to a spool to wind/unwind window blinds. I would like to operate the motor at $v=0.2\text{ m/s}$, with a max load of 1.5 kg. I need to know the ideal diameter ...
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1answer
56 views

Hot neutral in UPS devices in battery mode

I have faced a problem with ITYS E-3KVA UPS device. While operating in the in-line mode the measured neutral-ground voltage is almost equal to zero. However, during the battery mode the neutral-ground ...
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0answers
42 views

Determining thrust equations for a custom UAV

I have been tasked to mathematically model and simulate a 2 propeller, 2 motor UAV. But I am struggling with determining the thrust equations, of the propeller, for my design. I know that: Ft = Ct * ...
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4answers
76 views

Why hydroelectricity needs to flood so much land surface if only the height difference matters (hydrostatic pressure is not affected)?

Taking into account the fact that what matters in hydroelectric power generation is the potential energy of water, one would be led to the conclusion that we do not need the rest of the reservoir on ...
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1answer
18 views

What is the mechanism of transition in applications of finite state automata?

Just began studying automata. I've already seen several examples of the applications of finite automata: pattern matching, automatic doors, etc. And so far, I understand the logical connection between ...