Permanent magnet motor working on repulsion force

AI Thread Summary
The discussion centers on the viability of a permanent magnet motor operating on the repulsion of north poles. It highlights that while repulsive forces can generate motion, the energy required to initiate this motion exceeds the work produced, leading to energy loss primarily as heat. The concept of perpetual motion is explicitly rejected, emphasizing that such machines are impossible. Concerns about wear and tear on components due to friction are also noted, indicating that any practical implementation would face significant limitations. Overall, the conversation reinforces the principles of energy conservation and the impossibility of creating a perpetual motion machine.
faisal5455
Messages
2
Reaction score
0
Sir what would be the life of permanent magnet motor which runs by the repulsion of north pols. Is magnets energy wasted during this repulsion process or not. Because it continuously work on repulsion of two north pols.
 
Physics news on Phys.org
Can you draw a diagram to show what's in your mind?
Something like this?
attachment.php?attachmentid=69876&stc=1&d=1400403683.png
 

Attachments

  • hhhu.png
    hhhu.png
    384 bytes · Views: 831
diagram

magneticdiagram.jpg
 
Two (or more) North Poles will exert a repulsion on each other. This repulsive force can be converted into useful work. The amount of energy used to bring the two poles together will be MORE than the amount of work extracted from them. That is, you will be converting motion (generated externally) into heat. There is no such thing as a perpetual motion machine.
The diagram you added shows NO moving parts. If I assume that the two disks are spinning on the shaft, then the bearing surface will wear, but the amount of wear per revolution obviously depends on the materials of construction. The two disks will quickly stop, converting most of the energy you used to start them spinning into heat (friction) but some into electromagnetic waves.
To repeat the obvious, what ever energy you use to spin the disks will be only partially converted into movement of the shaft (if the shaft is also rotating). There is no such thing as a perpetual motion machine.
 
Last edited:
faisal5455 said:
Sir what would be the life of permanent magnet motor which runs by the repulsion of north pols. Is magnets energy wasted during this repulsion process or not. Because it continuously work on repulsion of two north pols.

Welcome to the PF. We do not discuss perpetual motion machines (PMMs) or "free energy" here at the PF. That is in the Rules (see Site Info at the top of the page). Thread is locked.

PF Forbidden Topics said:
Pseudoscience, such as (but not limited to):

Perpetual motion and "free energy" discussions
http://wiki.4hv.org/index.php/Free_Energy_Debunking
http://en.wikipedia.org/wiki/Perpetual_motion
http://www.skepdic.com/freeenergy.html
http://www.skepdic.com/perpetual.html
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'
So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
Back
Top