How can I vary the strength and direction of an electromagnet circuit?

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Discussion Overview

The discussion revolves around how to vary the strength and direction of an electromagnet circuit, with a focus on practical implementation and circuit design. Participants explore various methods and components that could be utilized in constructing the circuit.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses a lack of experience with circuits and seeks guidance on building an electromagnet circuit.
  • Another participant suggests that the strength of the electromagnet is dependent on the applied voltage and that the direction can be altered by changing the polarity of that voltage.
  • A participant mentions having a toggle switch and a slider resistor available for the circuit and seeks advice on their use.
  • There is a suggestion that rotating the coil could change the direction of the magnetic field, but this is questioned by others who seek clarification on whether a switch could achieve the same effect.
  • One participant explains that the configuration of the coil affects the strength of the magnetic field, noting that a shorter coil with more turns increases strength, while a longer coil with a smaller radius weakens it.
  • Another participant shares a circuit design for reversing DC motors, suggesting it could be adapted for use with the electromagnet.
  • There is a discussion about the complexity of achieving intermediate angles for direction change, indicating that simple methods may not suffice for all applications.

Areas of Agreement / Disagreement

Participants express differing views on how to effectively change the direction of the magnetic field, with some advocating for physical rotation of the coil and others suggesting electrical methods. The discussion remains unresolved regarding the best approach to achieve the desired outcomes.

Contextual Notes

Participants mention various components and configurations, but there are limitations in the details provided about the specific circuit designs and the assumptions underlying their suggestions. The discussion does not fully resolve the technical challenges presented.

worntilltorn
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I'm a mechanical engineering student but I'm tasked to do up a electromagnet circuit..any help willl be greatly appreciated!

I need to be able to vary the strength and direction of the field of the electromagnet. I have absolutely no idea how to go about doing this because i almost never handle circuits in all my years of studying. Pls help!

thanx!
 
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Welcome to PF! You'll find some helpful folks on this forum (as long as you show some effort). There are also lots of interesting posts that are quite fascinating reading..

Regarding building your electromagnet. Have you done some research around the net?
Here is one reference I found on quick search..
http://science.howstuffworks.com/electromagnet.htm
 
Welcome again to PF. I'm no expert by any means, but your strength of magnetism will be dependent upon the applied voltage, and the direction of the field will vary with the polarity of that voltage. Others here will give you better answers.
 
i do have a electromagnet at hand..now is the circuitry to change the direction and strength of the field..
i have a toggle switch and a slider resistor..i have access to a lot of others if need b...thanx for all the help so far!
 
What do you mean by change direction?
You could just rotate the coil.
 
rotate the coil? issit possible to do it with a switch? the magnet shld jus b left there..
 
You know an electromanget is just many turns of wire wound around an iron core? Right

So to increase the strength, you need to make a coil short in length with multiple turn, making a shape of a disk.

If you stretch the electromagnet in a form of cylinder (long coil short radius) then this configuration weakens the magnetic field.

Now, more turns you have, the resistance of the coil will increase, and you will have to power it up with more voltage to increase the current. And more heat will be dissipated as a result.

Note, the magnetic field is proportinal to current. To gererate more current, you have to apply more volts.

So if you are an ME student, just make an iron core with attached washers at both ends to keep the coil containted. Then you can wind the coil.
 
worntilltorn said:
rotate the coil? issit possible to do it with a switch? the magnet shld jus b left there..
I've taken the liberty of posting the circuit that I use for reversing DC motors. It uses a Double Pole Double Throw/Centre Off switch. Just replace the motor with your magnet, and you should be in business.
"[IMG[/URL]
 
Last edited by a moderator:
worntilltorn said:
rotate the coil? issit possible to do it with a switch? the magnet shld jus b left there..
Sure, as Danger notes, if by direction you mean 180 degrees or reverse field.
If you want intemediate angles then it gets more complicated.
 

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