I designed a nifty little mechanism that works by actuating a bi-directional solenoid that uses a cylindrical neodymium magnet (4mm diam, 23 mm long) as its plunger. The solenoid is activated depending on on the RPMs being read from a small turbine that has a couple of small magnets (2x2 mm) at its tips, which are then sensed by a magnetoresistive electronic component.
Everything works wonderfully, except that the solenoid and the turbine are so close together, that the neodymium plunger's magnetic field interacts with the turbine's magnets and prevents the turbine from easily spinning freely.
The obvious solution would be to physically separate both the turbine and the solenoid, but that is simply not possible, considering the space restrictions that the mechanism has at this moment.
So, after some googling around, I found that there is indeed a material called mu-metal that is used to help shield magnetic fields. My intention is to somehow place this material (about 0.010" thick) as a barrier between the solenoid and the turbine, and see if that helps prevent the plunger's magnet from interacting with the turbine's magnets.
My question is, is there anyone here with experience on this sort of thing? I'm about to spend about $50 bucks on a sheet of mu-metal to experiment with, and it would be real sad for me to learn that it doesn't help a darn thing with what I'm trying to do. @nsaspook, I don't know why, but I'm under the impression that you might know something about this subject.
Everything works wonderfully, except that the solenoid and the turbine are so close together, that the neodymium plunger's magnetic field interacts with the turbine's magnets and prevents the turbine from easily spinning freely.
The obvious solution would be to physically separate both the turbine and the solenoid, but that is simply not possible, considering the space restrictions that the mechanism has at this moment.
So, after some googling around, I found that there is indeed a material called mu-metal that is used to help shield magnetic fields. My intention is to somehow place this material (about 0.010" thick) as a barrier between the solenoid and the turbine, and see if that helps prevent the plunger's magnet from interacting with the turbine's magnets.
My question is, is there anyone here with experience on this sort of thing? I'm about to spend about $50 bucks on a sheet of mu-metal to experiment with, and it would be real sad for me to learn that it doesn't help a darn thing with what I'm trying to do. @nsaspook, I don't know why, but I'm under the impression that you might know something about this subject.