Thanks ash901226
Should go faster, but when I look at the second tutorial I see the voltage needle moving a lot which made me think voltages are higher and changing quickly.
Could this have a detrimental effect on the coils not just the bearings being worn faster? So eg it's a 6v max motor, and I run it at 6v then add some strong magnets could that be equivalent ('ish) of running it say at 12v? I'm not suggesting a linear relationship here, just trying to visualise.
E (volts) = (d [magnetic-flux] / dt) * N
So the EMF (E) = rate of change of magnetic flux with time, multiplied by the number of loops in the coil.
In my motor N is fixed, so the magnetic flux can be increased by the rare-earth magnets, hence EMF (volts) must increase. Is this right?