Solenoid Question: Interlocking Coils & Back EMF

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Discussion Overview

The discussion centers around the effects of interlocking coils, specifically solenoids, that are slightly offset and carrying current in the same direction. Participants explore the potential for these coils to interfere with each other, particularly in relation to back EMF and the creation of thrust through electromagnetic interactions. The conversation touches on theoretical applications in aerospace engineering and field propulsion.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions the effect of interlocking coils and whether they create back EMF due to their interaction.
  • Another participant introduces the concept of mutual inductance, suggesting that flux from one solenoid could couple through others, inducing voltage and potentially creating back EMF.
  • There is curiosity about the implications of using a DC pulse through intertwined solenoids and whether such a setup could generate thrust.
  • Participants discuss the implications of wiring the solenoids in parallel, noting that this would constrain their terminal voltages and affect independent operation.
  • One participant expresses interest in the potential for a pulsing field to create a force capable of propulsion, drawing a parallel to jet engine thrust.
  • Another participant mentions existing technologies like rail guns and ring guns that utilize electromagnetic induction for propulsion.

Areas of Agreement / Disagreement

Participants express curiosity and propose various ideas, but there is no consensus on the effects of the interlocking coils or the feasibility of creating thrust. Multiple competing views and uncertainties remain regarding the interactions and applications of the proposed setup.

Contextual Notes

Limitations include the lack of specific diagrams or figures to clarify the arrangement of the coils, as well as unresolved questions about the practical implementation and effects of the proposed configurations.

weatherlight
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Hi, I'm new to the forums, and I'm studying to be an aerospace engineer. I'm still in the start of my program, and I'm not in school till next semester, so this isn't for school.

My question is, what's the effect of interlocking coils that are slightly offset carrying a current in the same direction? Do they interfere with each other creating a back EMF?

I'm not sure how to attack this problem using the knowledge I have.
 
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weatherlight said:
Hi, I'm new to the forums, and I'm studying to be an aerospace engineer. I'm still in the start of my program, and I'm not in school till next semester, so this isn't for school.

My question is, what's the effect of interlocking coils that are slightly offset carrying a current in the same direction? Do they interfere with each other creating a back EMF?

I'm not sure how to attack this problem using the knowledge I have.

Welcome to the PF.

What is the context of the question? Do you have a picture or figure that you can show us to help us understand the question?
 
It's just something I'm curious about.

I don't have any pics, but its like a ven diagram with 4 circles. The circles are the solenoids, they would pass through each other.

I'm wondering what a DC pulse through such a set up would do.



When I get all done with school, I'm interested in getting into field propulsion. Since I've had a lot of time to sit and think, I wondered what a pulse through intertwined solenoids would do. So far my classes haven't dealt with solenoids that weren't connected linearly in a circuit.

I know solenoids are used to create magnetic fields by passing a changing current through them. Would it be possible to make a system with them where they create a "thrust" (for lack of better term)? Do fields interact with the world in this way?
 
weatherlight said:
It's just something I'm curious about.

I don't have any pics, but its like a ven diagram with 4 circles. The circles are the solenoids, they would pass through each other.

I'm wondering what a DC pulse through such a set up would do.



When I get all done with school, I'm interested in getting into field propulsion. Since I've had a lot of time to sit and think, I wondered what a pulse through intertwined solenoids would do. So far my classes haven't dealt with solenoids that weren't connected linearly in a circuit.

I know solenoids are used to create magnetic fields by passing a changing current through them. Would it be possible to make a system with them where they create a "thrust" (for lack of better term)? Do fields interact with the world in this way?

There is the concept of "Mutual Inductance", which deals with how much flux from one coil couples through another coil:

http://en.wikipedia.org/wiki/Mutual_inductance#Mutual_inductance

To the extent that some of the flux from your driven solenoid is also coupling through the other solenoids, that will tend to induce a voltage in the other solenoids. If there is a load connected to one or more of them, then the current that flows in the other solenoids will create a back-EMF in the first solenoid.
 
What if all of them are wired parallel on the same circuit?
 
weatherlight said:
What if all of them are wired parallel on the same circuit?

You don't usually wire inductors in parallel. Why would you do that?
 
I'm curious as to what it would do, and if there's any uses to such a set up.
 
weatherlight said:
I'm curious as to what it would do, and if there's any uses to such a set up.

When you connect the inductors in parallel, that constrains their terminal voltages to be equal. You cannot then drive one of them independently from the others...
 
I know. I'm interested on what effect the entire apparatus would have in relation to the surrounding enviroment.

Like would a pulsing field oriented in one direction create a force capable of propelling... well, anything lol. Similar to creating thrust by expelling hot gases in a jet engine.
 
Last edited:
  • #10
They have rail guns and ring guns that use electromagnetic induction to propel metal objects.
 
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