I just received my Pololu #1208 (10V/500mA) stepper motor and A4988 driver. I’m pretty new to stepper motors, so I am questioning the amount of heat dissipating from both the driver and the motor. I am running 18V to VMot and followed the steps found on this forum in calibrating the current limit. Set the limit to about 350mA. Also running a micro-controller from the 4988 which is jumpered to run 3.3V logic/output.
What’s more strange is that the motor begins to get hot just sitting there not running with reset held low (which I thought would turn off the FETs). Anyway, it is pretty uncomfortable to hold or touch (damn hot), both the motor and driver. Just want to make sure that this is normal before I continue to debug my code. Don’t want to burn up the motor or driver.
I am running in full step mode right now. I am assuming that running half step or greater would cause even more heat. Is that a correct assumption? Lastly, will I get more torque running at these higher step modes or just more accuracy?
My mistake on the part where motor was hot with reset low… Incorrect connection. Motor does not heat up with reset low. The voltage regulator is still pretty hot on the A4988 without the motor running, and only powering up the microcontroller. My microcontroller draws less than 100mA running code.