If the motor checks out, do the same on the 3 wires to the ESC. Again, you should get about the same readings between any pair of wires. If you have a much lower ohm reading, one or more FET transistors are open in the ESC. You should never have a short in the ESC without significant circuit damage.
Troubleshooting a motor can be quite a hassle unless you understand a bit about how brushless DC motors work.
A brushless motor uses electromagnets to spin the motor by pushing and pulling the magnets attached the bell of the motor.
Electromagnets can also be used to generate power. When you spin a motor by hand it generates power. Many modern generators use this same process to create power.
- If you short any two of the wires together you can create resistance within the motor when you try to spin the motor by hand.
- A brushless motor should spin freely when all the wires are separated as there is not a complete circuit.
- If the motor resists your rotation regardless of the wire connections, it’s likely that your motor has an internal short circuit.
How to test Brushless Motors for short circuits – no tools necessary!Posted on April 13, 2016 by Tim S.1 Comment 3750 views