I strongly suspect that the amount of motor vibration varies quite a bit based on the position of the magnets in the motor which I understand is not very precise.
Small changes in the phase of the motor drive makes quite a bit of difference in how smoothly the motor runs.
You can probably do this by tweaking the phase shifting cap value but the easiest way for me is to use a computer to generate the drive signal using an inexpensive frequency generating software.
Small changes in the phase of the motor drive makes quite a bit of difference in how smoothly the motor runs.
You can probably do this by tweaking the phase shifting cap value but the easiest way for me is to use a computer to generate the drive signal using an inexpensive frequency generating software.