Is this a 3 phase motor?

[Johan_Ha]

I think this is from a CD player.

I tried to find a dayasheet for the chip, it might include the motor driver. But I couldn't find anything, so I might make a driver of my own instead.

What I want to do is make this funny shaped magnet rotate "by itself" on a box lid.

[flashko]

Maybe this will help.

AN8290S.pdf (259.9 KB)

DSAIHSC00086200.pdf

[jhaine]

Yes, it's a 3-phase set of motor windings. Designed to drive a specific magnet configuration which might not match your magnet as you don't say which way it is magnetised.

[Johan_Ha]

I haven't checked my magnet, but I guess its axis is along the longest dimension of it. That would be perpendicular to the axes of these three coils.

@flashko

Maybe this will help

That's great help, thank you.

[Johan_Ha]

Here's my first idea to a circuit:

The three coils are connected in the middle, but in the original circuit the middle is not connected further to anything. I guess this is normal in 3 phase coiling. But since I have only a ULN2803A darlington array for this, I guess I have to power the coils in the middle (the blue line) and then sink the current through the ULN2803A.
Then I use PWM on pins 2, 3 and 4 to vary the magnetic field. By varying the PWM strength on each coil, I might get interesting effects on a magnetic or simply just an iron object on top of the coils, which would be the purpose of my project. In this circuit I can't reverse the current in the coils, only vary the strength of the magnetic field in one direction.