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DRV10983: BLDC motor drive overcurrent, unstable speed, and speed calculation problems

Part Number: DRV10983

Hi Team,

1. The speed (rpm) calculation formula in the manual is inconsistent with that in the software. The results displayed by the software are calculated based on the formula prompted by the software. Which formula should be used as the standard?

2. At low speed, the motor can run normally, but the motor speed displayed by the software will fluctuate within the range of 1hz (60rpm). Is it the measurement and calculation error of the software or the actual speed of the motor that fluctuates so much? May I ask if this is normal? Customer wants to be able to run the motor at a more stable speed.

3. The customer configured the software parameters according to the guidance of the configuration manual. After closed-loop operation, set the speed to 50 and the motor can rotate stably, but the motor will generate serious heat. After setting the speed value higher, the motor will not be able to rotate stably. It will accelerate for a while and then stop. The following are the software configuration parameters.

4. The motor used by the customer has two poles. Could he use FG to monitor the motor speed?

Regards,

Annie