patrickza wrote: ↑
Apr 23, 2018 2:35 am
Could it be a damaged phase wire? Or possibly a hall sensor which fails under high amps?
I didn't think it was the battery as I don't have any more voltage drop than I would expect, does that rule it out?
I don't think the hall sensors would fail only at higher motor currents. If the battery voltage is normal under load, that should be OK. Normally if the pack voltage sags too much, it will totally cut off the power.
To check the phase wires, unplug them from the controller and measure the resistance between each wire an the other two. On the meter, it should measure less than one ohm. If one of them is broken somewhere, it would look like an open circuit.
It's pretty rare for a phase wire to break.
Another way to check the phase wires is to unplug them and short any two and spin the motor by hand and feel the resistance. Repeat with all possible combinations of wires. You should feel a strong resistance to spinning the motor when the phase wires are shorted.