Hi,
I want to make a small linear brushless motor with only two pieces (magnets and winding), instead of using three layers with the copper winding in between, I'd like to just have one magnet layer and then the stator attached to back iron on the other layer. I guess this will produce eddy currents as the back iron moves across the magnets and may only allow for slow linear motion. Are there any other ways to make a linear brushless motor with two pieces like this? I guess one option is to not use back iron, but then there will be lower field strength in the motor.
Here is a picture of a "two piece" (magnets, winding) linear motor:
formatting link
Is that back iron on the top of the winding?"three piece" (magnet, winding, magnet) linear motor:
formatting link
cheers, Jamie