So I opened that inductor.
What to do now? The inductor itself seems intact.
But it cannot be cooled by one radiator because it is higher than the mosfets.
How do you all manage that esc?
Did you find out which inductor it is?
Probably they didn’t mean to cool the inductor , it is just in the way of the radiator.
BTW part of the MOSFETs is not covered with thermal epoxy , so the cooling is lacking out of the box…
Cooling for SMD FETs should be done from below with vias trough the PCB (or alu PCB), not through the plastic case. You could add a small piece of aluminium on top of the FETs if you still want to cool them from the top.
I understand what you mean. But this is the design that we have in hand - no extra pcb surface area and pcb is not aluminum.
2. Looking at the datasheets of our mosfet - ncep016n85ll, and mosfet with top contact - IPTC020N13NM6.
Our tjc=0.33, is it junction to plastic case or to some of the pins?
The infenion transistor specifies tjc=0.4 - that is the thermal resistance to it’s top tab. But it specifies also thermal resistance to some of the pins = 3
It’s an 820 inuctor which I have found impossible to get.
820uH? How do you know it?
And what it’s current rating?
No clue on current rating.
thermal resistance junction-bottom is usually between 0.1 to 0.5K/W for those devices
and junction-top between 15 and 20 K/W
You can read more about that in this document: https://www.ti.com/lit/an/spra953d/spra953d.pdf?ts=1718747075005
For our transistor this is the Tjc=0.3.
And it is the only thermal resistance data given.
There is no tab on the bottom, nor on the top.
Yes, this is the one on the bottom. Top will be between 15 and 20 roughly.
Please advise me about leash vs box placement.
When putting the box at the back of the board, I am afraid the leash will start pulling on the box, when I am in the water - testing it’s attachment.
Maybe to drill hole for the leash at the front?
Or to place the box at the front? (I kinda wanted to have the box out of the way)
Actually yes, there is a bottom tab.
So when they write junction to case - they really mean - junction to tab…
Some possible new ESC’s:
I bought two SEQURE 12200 ESC controllers. One has already burned out, the second cannot be set up. On a 12S battery the motor constantly jerks as if it is losing synchronization. I changed parameters such as Timing Advance and Sine Mod Power, but to no avail.
Return to 0% on current sens calibration. Mine run like a charm. There is a current sensor on this one. Not on Flycolor X cross
I don’t have such a menu item in the ESC Config Tool. Maybe you are talking about Current Limit Amps?
Ah, you didn’t take the BLheli but AM 32. I don’t know this software. I start to be comfortable with blheli now, and I had the same behaviour as your at the beginning but since I found the “Current Sens calibration” adjusted at 100%, I compared with my setup on X cross which is 0%, and it’s great at this value now. It’s an offset in other words. So you reach the current protection very quick if this offset is not centered.
could you please provide a more detail description ?
Thrust? prope material? etc?
Using 12S battery, the maximum thrust is greater than 30kg, and the propeller and pod are made of nylon fiber. It is made by mold. Very light and strong. Use 4 mm square wire. The battery can be taken out and charged separately, or directly in the aluminum box. No need to bother opening the box every time. Use a BMS with a maximum duration of 80A. The instantaneous current can reach 120A. It can be connected to the mobile phone via Bluetooth and has temperature protection. and current protection. Charge and discharge protection. The battery status can be displayed on the mobile phone. The battery level can be displayed on the outside of the box. It can also be seen on the remote control.
those SEQURE 100A look like a good size to fit in the Smaller FD box, do they have the FETS on one size only?
Was looking at these ones below as a option .does anyone use these ESC’s??
