Look at this video and tell us if this is what the washer sounds like
Try changing the speed selection of the washer (slow spin to high spin or vise visa) and see if it still does the same thing.
I believe you have a bad motor if it sounds like the one on the video.
What can happen is one of the motor windings will open. The motor will start on the other windings (start and high) then when the centripetal switch switches to the open winding the motor cuts off. When the motor cuts off the centripetal switch switches back to the start winding and the motor runs again for about ½ second or so. This continues until you turn the washer off.
This is not common but I have seen it a few times.