What your problem may be, is the Drive Belt? When was the last time it was changed?
The SAMA Motor shouldn't be changing, or fluctuating speed, and the SDS should be providing stable voltage-frequency to the Motor.
But, if your SAMA is using the newer, "stepped drive pulley", that one can adjust speed at the pulley in very small increments by which little groove the Belt is placed on, it is possible that an old, or worn belt is wandering on the Pulley?
Those ridges on the pulley are very small. I'd try this forst before resorting to Motor swap-outs. Mark
The SAMA Motor shouldn't be changing, or fluctuating speed, and the SDS should be providing stable voltage-frequency to the Motor.
But, if your SAMA is using the newer, "stepped drive pulley", that one can adjust speed at the pulley in very small increments by which little groove the Belt is placed on, it is possible that an old, or worn belt is wandering on the Pulley?
Those ridges on the pulley are very small. I'd try this forst before resorting to Motor swap-outs. Mark