Report on Hobbyking 40A ESC 4A UBEC 9261000003 / BC3540-14 brushless drive #2

Report on Hobbyking 40A ESC 4A UBEC 9261000003 / BC3530-14 brushless drive reported a set of measurements on a test on elements of a drive system which is the basis for one of my flying quads.

This article reports some interesting characteristics derived from the measurements.

Test configuration:

  • Gemfan 11×4.7″ SF propeller;
  • BC3530-14 1000Kv motor;
  • Hobbyking 40A ESC 4A UBEC 9261000003 (BEMF caps removed);
  • SimonK commit 02bd8e4ca36a06722efe51bc7cd5130d72a184b8 bs.hex with 2000ns dead time; and
  • 4Ah 4S Lipo battery.

Keep in mind that the application for this drive is a multirotor, and hover speed is around 3800RPM, so efficiency in that region is critical to battery endurance. Continue reading Report on Hobbyking 40A ESC 4A UBEC 9261000003 / BC3540-14 brushless drive #2

BLDC ESC – effect of insufficient dead time

This article reports measurements on a brushless drive used for an RC quadcopter.

Dead time is the time allowed between turning one FET in a half bridge off and the other FET on to ensure that they do not both conduct simultaneously, even for an instant, as very large currents may flow. The dead time specified in ESC configuation is an ‘additional’ delay added over and above circuit delays.

ESC02

Measuring a stable properly synchronised drive system at minimum speed can expose the effects of insufficient dead time on total drive input current. At minimum speed, very little power is delivered to the propeller and most drive input power is lost in various system losses, so drive current becomes very sensitive to system losses. Continue reading BLDC ESC – effect of insufficient dead time

Report on Hobbyking 40A ESC 4A UBEC 9261000003 / BC3540-14 brushless drive

This article documents some a test on elements of a drive system which is the basis for one of my flying quads.

Test configuration:

  • Gemfan 11×4.7″ SF propeller;
  • BC3530-14 1000Kv motor;
  • Hobbyking 40A ESC 4A UBEC 9261000003 (BEMF caps removed);
  • SimonK commit 02bd8e4ca36a06722efe51bc7cd5130d72a184b8 bs.hex with 2000ns dead time; and
  • 4Ah 4S Lipo battery.

The dead time was chosen for compatibility with F-40A which I also use. Dead time of 1200ns is sufficient for the 9261000003.

This is quite a low cost drive, the 300W+ motor cost about A$14 and the 40/60A 6S ESC just under A$20 at the time of purchase.

The tests were conducted at 4S as a stress test (up to 170% of rated current), the quadcopter uses 3S. Continue reading Report on Hobbyking 40A ESC 4A UBEC 9261000003 / BC3540-14 brushless drive

Hobbyking Swamp Dawg build – #1

SwampDawg01

I couldn’t resist the Hobbyking Swap Dawg as an opportunity to play with SimonK ESC firmware with forward / reverse enabled.

ESC selection and implementation

I selected a Hobbyking F-30A ESC, which might seem a bit of overkill but it is a closed air space which reduces its dissipation capacity. The F-30A have proven themselves reliable with SimonK on a range of BLDC motors. Continue reading Hobbyking Swamp Dawg build – #1

SimonK on Hobbyking 40A ESC 4A UBEC 9261000003

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. Continue reading SimonK on Hobbyking 40A ESC 4A UBEC 9261000003