Firstly some background:
I would like to make a magnetic stirrer, like the ones they use in chemistry labs:
A small bar magnet sits inside the glass jar, while another bar magnet, attached to a motor is spun underneath the jar. This causes the first magnet to spin too, thus stirring the liquid.
But I'm sure it must be possible to do this without the motor underneath, simply using coils. Either a brushless motor or a stepper motor.
And now my question:
Is there a name for such a motor, where there are coils on one side of a sheet of glass (or similar), but the rotating / permanent magnet part is on the other side?