hat_tr1ck
1 µW
- Joined
- May 7, 2019
- Messages
- 4
Few weeks back while running a 50KW BLDC purchased off Alibaba with a custom 80kV winding by Dongguan Freerchobby Model Co., the Flier ESC F-120V-500A-A caught on fire after the motor starting up (jerky).
Here is a video of the setup, the motor acting before the incident, the incident itself, and the post mortem of the motor controller plus the power schematic.
The Flier ESC is rated to 120V and 500A as per their websitte. Not that I take their website as the absolute truth given they are not a highly reputable supplier, but I don't think over voltage was the issue. The controller was pre-charged using the schematic shown in my video, although Flier insists that the controller does not require precharge (even with the 120V battery input).
Here is the motor's Alibaba page. It's a sensor less motor.
My two standing theories are:
1. Controller and motor lost sync, leading to a current spike - Unlikely because we were running low throttle / low speed
2. Motor winding is short - Could be, supplier assures me they tested at the factory and it was fine. Motor had barely been ran before the incident, and pos incident i do not spot any burnt windings. At the same time, winding resistance to ground is all over the place (some in the MOhm range, some kOhm. My understanding is that they should have 'infinite' resistance)
Has anyone dealt with something like this before? Depending on the most likely cause, I may send the motor back to the supplier for 'repairs', or just look elsewhere for a different supplier. Motor is for an eVTOL project.
Here is a video of the setup, the motor acting before the incident, the incident itself, and the post mortem of the motor controller plus the power schematic.
The Flier ESC is rated to 120V and 500A as per their websitte. Not that I take their website as the absolute truth given they are not a highly reputable supplier, but I don't think over voltage was the issue. The controller was pre-charged using the schematic shown in my video, although Flier insists that the controller does not require precharge (even with the 120V battery input).
Here is the motor's Alibaba page. It's a sensor less motor.
My two standing theories are:
1. Controller and motor lost sync, leading to a current spike - Unlikely because we were running low throttle / low speed
2. Motor winding is short - Could be, supplier assures me they tested at the factory and it was fine. Motor had barely been ran before the incident, and pos incident i do not spot any burnt windings. At the same time, winding resistance to ground is all over the place (some in the MOhm range, some kOhm. My understanding is that they should have 'infinite' resistance)
Has anyone dealt with something like this before? Depending on the most likely cause, I may send the motor back to the supplier for 'repairs', or just look elsewhere for a different supplier. Motor is for an eVTOL project.