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.
1,497
questions
0
votes
0
answers
19
views
Why isn't my valve controller not providing sufficient amount of voltage to my fan?
We're using the valve controller below to control the speed of a (generic) fan: https://products.axiomatic.com/viewitems/valve-controls/can-to-4-outputs-valve-controller
Problem: We're supplying the ...
- 103
0
votes
1
answer
40
views
How to measure the rotation direction and speed of a ring on a finger?
I am trying to create a device that can measure the rotation of a ring on a finger. Basically there's going to be two rings on the finger, one that rotates and one that is stationary. The idea is that ...
- 3
0
votes
0
answers
56
views
How to calculate the distance between cable supports, considering the weight and other factors?
I am designing a cable infrastructure and have come across the question of calculating the optimal distance between supports for cables. What formula can be used to determine this distance, taking ...
- 1
0
votes
1
answer
248
views
Mesh Size and Thickness for Faraday Cage?
I've been considering a double faraday cage of 1/4in 23-gauge wire and 1/8in 27-gauge wire. With this setup would the 1/4in on the outer shell and 1/8in on the inner or the 1/8in on the outer shell ...
- 131
1
vote
0
answers
34
views
Strange inverter PWM output signal at startup
I’m monitoring the output of a 3-phase inverter with an oscilloscope, the inverter is a Siemens Sinamics V20.
I see that when I enable the power output of the inverter, I have a strange sequence ...
- 11
0
votes
1
answer
96
views
How to calculate the RPM required from a DC motor in order to pull an object that is attached to wheels
I am attempting to make my first project idea of using a DC motor as a winch motor in order to pull an object, I am using string as the rope to pull object I am attempting to "winch" (air ...
0
votes
1
answer
76
views
Is it possible to build a radar that is shielded behind one meter of ceramic material and still detect people 500 meters away?
I saw that there are radars which can detect people behind walls, so I wonder what the limitations of radars are when it comes to detecting people while being protected behind thick ceramic shield.
- 1
0
votes
0
answers
36
views
What substances have the lowest dielectric strength (volts/meter)?
All the tables of dielectric strength I can find are lists of materials that engineers use as practical insulators, and air is usually the least insulating thing on the list.
Where can I find a more ...
- 101
0
votes
1
answer
41
views
What will happen if you attach the negative pole of welder to the rotor of the motor or the body , will that cause problem?
I have built a machine that rotates a cylinder to weld it, I have to attache a negative pole to the cylinder which is connected directly to the rotor of motor, the motor is controled by an Abb vfd ...
0
votes
0
answers
53
views
Truncation operator
I'm currently working on this question, and I'm unsure how to determine if it is time-invariant or not. When I perform y(t-t0), does it shift even the time at which the step is defined? Furthermore, ...
0
votes
0
answers
42
views
69kV insulator identification
Rather Specific question, is there a way or could anyone figure out what this clamp-top 69kV multipart insulator came from like who makes it or the technical name etc these are transmission lines in ...
- 1
0
votes
0
answers
37
views
Using Relay and contactless water level sensor to switch on or off motor pump
I have no prior experience related to electrical projects and I am having confusion about which type of relay and how to connect relay, contactless water level sensor and motor pump.
So basically I ...
0
votes
1
answer
71
views
Principle of RF MEMS switches
I am studying mechanical engineering at university and am trying to design an RF MEMS switch. In "RF MEMS Switch Li-Feng Wang, Qing-An Huang, and Lei Han" says "When an adequate voltage ...
- 1
0
votes
0
answers
22
views
Electrical Charges
I have been doing some research on different textile materials and electrical charges. If I wanted to change a negatively charged material to a positive one, would that be possible? Thinking I could ...
- 1
2
votes
1
answer
219
views
Why aren't Dielectric Elastomer artificial muscle actuated robots more common?
Well, while searching for dielectric elastomer actuators I can find that they normally have efficiencies around 80% or more (source page 38), they are cheap and easy to build.
But the more I search ...
- 51