Motor health monitoring

A method, comprising:

• determining, by a motor controller using one or more current sensors, a first current associated with a motor controlled by the motor controller;
• determining, by the motor controller using the one or more current sensors, a second current associated with the motor;
• determining, based at least in part on the first current and second current, a back-electromotive force (EMF) signal associated with the motor;
• determining, based at least in part on the back-EMF signal, a first flux linkage value of the motor at a first time;
• and
• causing to store, in a datastore, the first flux linkage value associated with the first time.

An aircraft comprising:

• one or more controller(s);
• a datastore;
• a motor;
• one or more current sensors communicatively coupled to the one or more controller(s);
• and
• a display device, wherein the one or more controller(s) are configured to:
• receive, from the one or more current sensors, a current value associated with the motor;
• determine, based at least in part on the current value, a back-electromotive force (EMF) value associated with the motor;
• determine, based at least in part on the back-EMF value, a flux linkage value at a first time;
• determine that the flux linkage value is greater than a threshold level;
• determine, based at least in part on the flux linkage value being greater than the threshold level, that the motor is safe to use;
• indicate, on the display device, that the motor is safe to use;
• and
• store the flux linkage value in association with the first time in the datastore.