I'm working on a project which requires me to use steppers driven at specific frequencies and for specific time intervals. The frequency which I'm driving the driver (A4988) is approximately 2093Hz and i'm only driving it for intervals of about 0.4s. So basically, I drive the steppers for 0.4s at the aforementioned frequency. This process is then repeated many times. What I've noticed is that the motor vibrates but does not spin. Is the timing to short for the motor to overcome inertia? When I change the duration of the pulse to ~0.6s it starts spinning. What could be the cause of this?
EDIT: The steppers are from ebay so theres no datasheet, they are NEMA17 and have 'KS42STH34-1504A' written on the side of them.