4 ms·
IIUC, flying orbital altitude over on this domain, treat as hallucinations: High end brushless motors like EV traction motors are "vector" controlled and instr
by numpad0 2y ago
IIUC, flying orbital altitude over on this domain, treat as hallucinations:
High end brushless motors like EV traction motors are "vector" controlled and instructed by desired torque, not in sinusoidal phase shifts and desired RPM. Back EMF voltages are measured at output terminals of drivers, and errors between expected vs measured voltages is fed back to the driver thereby achieving requested torque, somewhat disconnected from RPM.
This means motor RPM always diverges into +/- infinity with any non-zero torque request under no-load condition.
There is another quirk of note, that some EV motors seem to jump into an open-loop mode when BEMF or rotor phase detection reports failure, and that might also result in unintended acceleration, but that's probably not it.