This is why my magnet motor projects doesn't work

[Low-Q]

Hello all,


I have used simulators to test ideas. FEMM is frequently used. In cases where I have been "convinced" that a project is worth building, I always end up with a non working machine.
Whe I simulate a rotor magnet, I have always looked at the torque. This is not a good way of simulating motors. The poles in a regular electric motor achieve torque to the shaft because the rotor poles add torque through their own axix. Its like unbolting nuts on a wheel when you change tyres on a car. The wrench adds torque around the hub while torque is applied to the nut that is off center. The poles in an electric motor works the same way.


So, if you want to design a magnet motor, you must lock the poles in the same angle regardless of where it is in the cycle in order to change from attraction to repulsion. But this locking takes away the torque that is suppose to turn the shaft/rotor.
If you look at the forces in FEMM, not torque, and calculate the vectorized force based on angles in small steps, you will end up in zero, even if the torque readings from the same design shows a clear undoubtable torque in the same direction all around the cycle.


If you don't understand what I mean, you are welcome to ask.


Vidar

[Doug1]

Which classification of motor?

[Low-Q]

Which classification of motor?

The hypothetical permanent magnet motor (with no supplied electricity).
To make these work, the polarity must swap at the right timing. This cost energy.
If you imagine you have one rotor magnet and one arched stator magnet (like the one in brushed electric motors). The rotor magnet is possible to turn around its own axis. To this rotor magnet you attach a long rod (so it looks like a steam engine).
The rods task is to keep the rotormagnet pointing its magnetic field in the same direction all the time.
The rotor magnet will with this rod face the stator magnet with different poles at the entrance and the exit, making it possible to attract and repell at the right spot as it moves along the arched stator magnet. This happens to be true if we simulate torque. But remember where the torque comes from. There is no way of simulating a fixed position that gains torque in a system, so therfor the simulated torque readings is wrong.


I might be a little unclear here - I try to work at the same time I write this :-))


Vidar

[Low-Q]

Here is a drawing.


Position 1 -7 is the same magnet but in different positions. The magnetic field is pointing in the same direction all the time.

[Doug1]

 Your thinking the magnetic field is going to work the same way a water wheel works when water flows by gravity over the wheel to push the paddles or buckets. The magnetic field doesnt flow like that. what is termed polarization is just a term used by people. What passes for North and south is just in relation to the earths fields so a compass can be used for navigation and people can communicate a location or direction to one another. It could just as easily have been flip flopped. The graphic images used to define a magnetic field are only relevant words of description for a particular conversation. They only really seem to expand and contact no wind like effect in the terms your thinking by your drawing. There is just as much pull back after the disc passes the apex of the field south to north north to south and each against it's own sign. Your going to end up chasing the mono pole which would make the magnet not a magnet. If you try to chase the neutral field of non polarized material that is still a pole just that is a neutral pole attracted to any pole different from itself. A permanent magnets field is established, it can only be distorted or destroyed. To squeeze one magnet past another under repulsion of fields has the same push back before and after and then will certainly get stuck in attraction as it is pulled back once it passes the apex of the field it is attracted to.