I was testing the temperature limits of a 3kw DD hub motor (+ Statorade+Hubsinks) and went up to 150 degrees Celsius. After that, drag was increased.
Consumption during no load speed (without field weakening) went up significantly from 300W to 1300W while no-load rpms stayed about the same. This happens both in sensorless and hall sensor based mode.
The motor still works fine, but has increased drag, gets hot more easily (less efficient) and vibrations at some speeds have increased.
I measured phase-to-phase resistance and it was about equal between the three combinations, so no short.
When I had the motor open the last time, the windings were already black at some spots, but it was still working fine.
Unfortunately I won't have time in the next weeks to open the motor to see what happened.
Do you have any ideas what could have happened?
Consumption during no load speed (without field weakening) went up significantly from 300W to 1300W while no-load rpms stayed about the same. This happens both in sensorless and hall sensor based mode.
The motor still works fine, but has increased drag, gets hot more easily (less efficient) and vibrations at some speeds have increased.
I measured phase-to-phase resistance and it was about equal between the three combinations, so no short.
When I had the motor open the last time, the windings were already black at some spots, but it was still working fine.
Unfortunately I won't have time in the next weeks to open the motor to see what happened.
Do you have any ideas what could have happened?