I am designing a circuit for driving the stepper motor, the link attached (https://www.alibaba.com/product-detail/3v-12mm-2-phase-micro-dc_60641420857.html?spm=a2700.7724838.2017115.17.149a279bsYy1CA&s=p) using 2xAA (2.4V) NiMH 800mAh batteries. Also, I am using a boost converter U1V10F5 (0.5V-5.5V)to step up from 2.4V to 5V to power up the motor as well as the driver (DRV8834). I've found that the motor that runs at 2.7V consumes approximately 70mA. The question is if I am using normal 2xAA(3V) battery or bench power supply (set it to 2.7V) the circuit is working fine and the motor is running. Whenever I set the voltage to 2.6V or 2.4V on the bench power supply or connect the 2XAA rechargeable battery my motor stops working.
Is that the rechargeable battery not having enough capacity? or the step up booster is not able to supply enough current to drive the motor at 2.4V? Please let me know why the motor is not running at 2.4V and runs at 2.7V. I have attached the rough schematic. I am using two PSU for the microcontroller(5V@3A) and the motor(2xAA(2.4V)) indicated in dotted lines in the schematic. Your guide is much appreciated.
Thanks in advance.