DRV8323: Noise reduction feature, similar to DWELL

Hey Sebastien,

How are you planning on driving the motor? Trapezoidal, FOC? Sensored vs sensorless?

Best,

Akshay

Hi Tisl,

TISL said:

Is there a simple way to implement a similar feature than the DWELL function of the DRV8305, to lower the noise?

Sure you could insert Dwell state in between the 6-step trapezoidal commutation to lower the acoustic noise. This can be done by the MCU with the driver configured to 3-pwm or 6-pwm input mode. The MCU detects the Hall signal transition moment and inserts in the Dwell state a short moment before inserting the next normal state (of the standard 6 states). 

Btw, the best way to run the motor with minimum acoustic noise and vibration is to implement Sinusoidal commutation with the MCU reading the motor position encoder as the pointer to the sinusoidal look-up-table, which output 3 pwm sinusoidal to the driver inputs. (In addition, a custom design motor can have the stator lamination skewed to overlap the lamination stack, which minimized motor cogging torque.)

Brian