Spinning magnetic field through a coil-can this propel engines?

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Discussion Overview

The discussion centers around the feasibility of using a spinning magnetic field through a coil to propel engines, specifically exploring the mechanics of torque generation and energy efficiency in such a setup. Participants examine the theoretical implications and practical considerations of this concept.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant proposes that spinning a magnetic field over a coil could continuously spin the coil and, consequently, an attached axle and propeller.
  • Another participant questions the practicality of this motor configuration, suggesting that directly spinning the propeller shaft would be more efficient.
  • A different viewpoint argues that using a spinning magnet would require less energy to initiate motion compared to directly propelling the shaft.
  • Concerns are raised about the concept potentially resembling an over-unity engine, which is considered impossible according to forum guidelines.
  • Participants express confusion regarding the energy dynamics, with one asking for clarification on where their reasoning may be flawed.

Areas of Agreement / Disagreement

Participants do not reach a consensus; there are competing views on the practicality and energy efficiency of the proposed method, with some arguing against the feasibility of the concept.

Contextual Notes

There are unresolved assumptions regarding energy input and output, as well as the definitions of efficiency in the context of the proposed mechanism.

ARAVIND113122
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Spinning magnetic field through a coil-can this propel engines??

Magnetic field through a coil produces torque in the coil. Suppose we have a coil.The set up is such that the magnetic field passes through the coil.Now,if we spin the magnetic field along with the coil,the coil will keep spinning.an axle can be connected to the coil.and a much heavier object,say a ship propeller can be attached to the axle.as the field spins[this can be done by keeping a very powerful horseshoe magnet over the coil and spinning the magnet],the coil will spin,and the axle along with the propeller will spin. Is this possible??
 
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ARAVIND113122 said:
Magnetic field through a coil produces torque in the coil. Suppose we have a coil.The set up is such that the magnetic field passes through the coil.Now,if we spin the magnetic field along with the coil,the coil will keep spinning.an axle can be connected to the coil.and a much heavier object,say a ship propeller can be attached to the axle.as the field spins[this can be done by keeping a very powerful horseshoe magnet over the coil and spinning the magnet],the coil will spin,and the axle along with the propeller will spin. Is this possible??

It does not sound like a practical motor configuration.

Instead of spinning the magnet, why not just spin the propeller shaft directly?
 


This is because it will take a lot more energy to propel the shaft directly.The idea is to use very little energy to spin the magnet-the torque by the magnet will then spin much heavier objects.
 


ARAVIND113122 said:
This is because it will take a lot more energy to propel the shaft directly.The trick is to use very little energy to spin the magnet-the torque by the magnet will then spin much heavier objects.

False. Sounds like you are trying to come up with an over-unity engine, or similar. Discussions of such (impossible) devices are not allowed on the PF.
 


But sir,can you please tell me where exactly i am going wrong?
 


ARAVIND113122 said:
But sir,can you please tell me where exactly i am going wrong?

You are going wrong in thinking that you can get more energy out than you put in. The energy has to come from somewhere. There is no "magic" energy.
 

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