All Questions
19
questions
0
votes
3
answers
253
views
Inductance of solenoid with solid metal core
Consider the solenoid/inductor like in the picture.
There is an air gap between the coil and the inserted solid metal.
The solid metal is from aluminum or copper (Both have a relative magnetic ...
- 39
5
votes
1
answer
415
views
H-bridge design works but only with inductive load
I have an H-bridge configuration using gate drivers and bootstrap capacitors to drive the high side MOSFETs. I have a load that I pulse with stored energy from a capacitor. The capacitor voltage is ...
user298907
6
votes
1
answer
969
views
Measure inductance of air core inductor
I am making an inductor
Air core
Wire: 18 AWG guage
Turns: (I am not sure ) but could be about 6000 turns
The weight of the wire : 400 gram
The coil wrapped by machine
Coil is 5 cm
Diameter of core ...
- 465
1
vote
4
answers
2k
views
Designing an RC snubber for AC solenoid lock (inductive load)
I am designing an AC solenoid lock. Here is my design:
Resistance 8 Ω
Main outlet power source 220 V - 50 Hz
Inductance 150 mH
Impedance 47 Ω
I (RMS) ~ 5 A
I read that the inductive load needs a ...
- 69
1
vote
1
answer
400
views
What equation should I use to calculate inductance of wire coil?
I've been working on a project recently which requires me to build an inductor, however in my research I found many different equations (with a range of variables used and giving very different ...
0
votes
0
answers
163
views
AC LC Filter for a Solenoid - Unexpected Behavior
I've been working on a circuit that uses a microcontroller and an H-bridge with 34VDC supply to control a variety of low voltage loads including 24VAC solenoids at 50/60Hz (SHEPWM waveform to knock ...
- 149
1
vote
2
answers
245
views
Why does the measured back-emf decrease when R is shorted in this circuit?
In the following circuit I move an iron rod back and forth inside a solenoid (represented by Rsol and Lsol) and measure voltage fluctuations across the terminals. I do this under two scenarios: with ...
- 439
3
votes
1
answer
413
views
Solenoid and mechanical damping, options for ways to minimize
I have an iron rod supported by a coil spring that vibrates vertically within a solenoid coil. The solenoid has a 5 ohm dc resistance. There is no physical contact between the coil and rod.
As I ...
- 439
3
votes
2
answers
8k
views
Flyback Diode for 24V DC Solenoid
I am trying to select a diode to prevent my circuit from being damaged by the collapsing magnetic field from the solenoid in my circuit. Solenoid power will be switched off through the actuation of ...
- 31
0
votes
0
answers
177
views
How to create optimal solenoid actuator
I would like to create a solenoid like this one:
It should be powered by 5V and of course I want it to take as little current as possible. I know it will probably still take a current of around 0.75, ...
- 101
1
vote
2
answers
1k
views
How can we calculate the force of attraction between a coil and a ferromagnetic object?
As the question states I’m trying to figure out how I can calculate the force of attraction between the magnetic field of a solenoid (coil) and a ferromagnetic object. I suppose we should somehow ...
user234225
0
votes
1
answer
956
views
Controlling a 24VAC solenoid with arduino
I'm trying to come up with a design for controlling a 24VAC water valve with an arduino.
My current design :
I want to use a BT1308W TRIAC controlled by an arduino pin to activate the vale, I'm also ...
- 491
2
votes
2
answers
583
views
About misunderstanding of Lenz law
What I understand from Faraday and Lenz laws is that(I might be wrong): a voltage appears across an inductor when the current through it changes. And the polarity of that voltage is such that it ...
- 4,333
5
votes
5
answers
14k
views
Inductor in-rush current
The inductor equation V = L(di/dt) shows that inductors will resist instantaneous changes in current. Thus, they can be used as in-rush current limiters in power ...
- 1,675
1
vote
2
answers
2k
views
Parallel windings on a solenoid coil
Suppose I have a fixed voltage supply of 10 V and I need to get 20 amp-turns from my solenoid coil but my solenoid coil with 10 turns is 10 ohms, so I am getting 10V/10 ohms = 1A, 1A * 10 turns = 10 ...
- 35