Hi Team,
The customer made a batch of motor drives with DRV8846. The hardware circuit is built in strict accordance with the typical circuit given in the manual.
The machine has a boot process and a command motor rotation process.
The software configuration is 32 subdivisions, 75% current, attenuation mode is manual, and Toff is high resistance. Switch the machine on and off repeatedly and command the motor to rotate.
- The motor may be very quiet, or it may be very noisy, and the motor is shaking, and the probability of noise is very high;
- If the sound is very light after power on, as long as the power is not turned off, the sound is always very light;
- If the motor is noisy after starting up, the noise will always be loud as long as it is not turned off
Motor noise file: 20210520_153847.m4a
When the motor makes abnormal noise, the waveform at AOUT1 is:
Software modification:
- After the machine is turned on, the attenuation mode is automatic, Toff is high resistance
- Before commanding the motor to run, change the attenuation mode to manual, repeat the test in a short time, the sound is very light, no noise
If he does not modify the software and uses a hot air gun to re-weld the DRV8846, and repeated tests within a short period of time, there is no loud motor noise.
Is this phenomenon related to the configuration of the software or the welding of the chip?
Thanks,
Annie