Part Number:DRV8308EVM
I am evaluating DRV8308 chip for my motor using DRV8308EVM. it is known that hall sensor is 0 degree aligned (from vendor with integrated motor/hall sensor). I started motor using the open loop: pwm mode and 120 deg commutation. motor can rotate but with noise and bumpy visible bumpy rotation and motor can get really hot after a few minutes. Hall sensor's output shows the uneven speed too. I adjust ADVANCE value and speed will be impacted but the noise, uneven speed and motor getting hot remains. I tied to change to 180 commutation (sine) and it won't help. Lockn signal come and go. Any tips what should I do to improve the smoothness of rotation and reducing the heat generated by motor?
The motor's specification: 12V with no load speed 63400 rpm, nominal speed 46800rpm (the motor is integrated with a 15:1 gearhead and with a simulated load). phase resistance = 12ohm, inductance 0.118 mH. I have run the motor with the motor mfg's controller which can run quietly and won't get hot at all.
thanks,
Hong
