Following on from BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #3, further tests were conducted on the ‘chugging’ ESC.
The 9261000003 is a relatively low cost ESC with 6S rating and fast FETs.
At Simon’s suggestion, the BEMF caps were removed. This eliminated the chugging effect on both the DT750 and 4822-690KV where it had been previously observed. The 4700pF BEMF caps are in a vertical row at the bottom right of the pic above.
I used to routinely remove BEMF caps (a carry over from using WiiEsc), but found on some tests that it made insignificant difference. That might be the case for some motors and smallish caps (1000pF), but in this case, the combination of these challenging motors and largish BEMF caps were incompatible and removing the caps solved the problem.
The BEMF caps were on the three empty positions in the bottom right of the above pic.
- The 9261000003 is a relatively low cost ESC with 6S rating and fast FETs.
- With the BEMF caps removed, the drive to the 9261000003 with DT750 or 4822-690KV on 4S was rock solid, and the response with SimonK is faster than documented for BLHeli at BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #3.