Other Parts Discussed in Thread: MCT8316Z, DRV10983, MCT8316A
HI TI
1. DRV10983 controls the HALL motor with no noise, while MCT8316Z controls with noise. Comparing the motor phase current waveforms of the two, the motor phase current of DRV10983 is close to sine, while the motor phase current of MCT8316Z is in a stepped shape. It is suspected that the stepped phase current will cause torque pulsation, thereby causing motor noise
2. Check the MCx8316x series chips. All A-series chips can reduce motor noise by optimizing the phase current to be close to sine, while the Z-series does not. The phase current of MCT8316A when using 120 ° commutation is consistent with that of MCT8316Z, which is 3.3 dBA higher than the audible noise when using 150 ° commutation
Q1: Based on the above information, can we determine the inherent control characteristics of MCT8316Z, which is equivalent to the absence of current closed-loop, which may cause motor noise problems?
Q2: To solve the problem of HALL motor noise, would it be better to add Current loop outside when MCT8316Z is controlled, or choose another type of motor drive chip?
