A new Anti-Lenz motor concept

broli · April 25, 2021, 11:21:53 AM

Thought I would share a new idea that I was working on. The idea came about by trying to figure out how a magnet and coil would interact in such a way that they would aid the motion causing the EMF instead of resisting it. The drawings should explain the setup pretty well. But the key idea here is how the flux crosses the cores making the core on the other side have a field that is in the same direction as the magnet's. This little hack could lead to an interesting interaction between the magnet, core and coil. Sadly FEMM cannot simulate this setup as it's not possible to model it in 2d if someone has a 3d FEM simulator I would be very interested to see the results.

1. Shows the overall setup
2. Shows the flux path of the setup
3. Shows the natural state of the system if the coil is open i.e. the magnet wants to move away from the core
4. Shows what happens when the magnet is pushed towards the core with the coil shorted
5. Shows what happens when the magnets is pushed away from the core with the coil shorted

The hypothesis is that when the magnet is moving towards the shorted coil+core it will experience a resisting force that is smaller that if the coil was open and doing nothing. And when it's moved away from them it will experience a larger force pushing it away than if the coil was open. So with each cycle there is a kinetic energy gain opposed to no energy gain if the coil was open.

bistander · April 26, 2021, 02:22:18 AM

Why does motion of the magnet in the direction of the black V vector cause a change in flux through the coil?

broli · April 26, 2021, 05:02:17 AM

The closer the magnet gets to the the coil/core the smaller the flux path distance becomes and thus more flux through the coil/core. When it moves away the opposite happens.

Again this is just a hypothesis and must be confirmed. If anyone out there has Ansys Maxwell, would be great to see if this assumption is true.

bistander · April 26, 2021, 08:33:45 AM

Quote from: broli on April 26, 2021, 05:02:17 AM
The closer the magnet gets to the the coil/core the smaller the flux path distance becomes and thus more flux through the coil/core. When it moves away the opposite happens.
...

True, but that difference in an unsaturated ferromagnetic path length compared to the effective gap lengths represents, IMO, negligible mmf difference therefore, essentially, no appreciable change in flux for the magnetic circuit. Also, does not the coil and its core have to displace along with the magnet?

broli · April 26, 2021, 02:04:47 PM

Quote from: bistander on April 26, 2021, 08:33:45 AM
True, but that difference in an unsaturated ferromagnetic path length compared to the effective gap lengths represents, IMO, negligible mmf difference therefore, essentially, no appreciable change in flux for the magnetic circuit. Also, does not the coil and its core have to displace along with the magnet?

This can be controlled by air gaps, I also hinted at this in image #2 where there was another path behind the magnet.

Meanwhile I have been entertaining a different design variant which removed the need of the "diode" magnets or air gaps. And a 3d simulation might come soon too due to a little helper.