Methods and systems for detecting a winding resistance and winding temperature of an alternating current electrical machine

A system comprising:

• a processor;
• and
• a nontransitory computer-readable medium including instructions that are executable by the processor, wherein the instructions include:
• determining a vector state of an alternating current (AC) electrical machine;
• when the vector state is a zero-vector state:
• obtaining a plurality of phase current samples of the AC electrical machine;
• determining a decay time constant based on the plurality of phase current samples;
• and
• determining a resistance of a winding of the AC electrical machine based on the decay time constant;
• and
• selectively controlling a plurality of switches of an inverter configured to provide power to the AC electrical machine based at least on the resistance of the winding of the AC electrical machine.

A method comprising:

• determining a vector state of an alternating current (AC) electrical machine, wherein the vector state is one of a zero-vector state and a nonzero-vector state;
• when the vector state is in the nonzero-vector state:
• obtaining a plurality of phase current samples of the AC electrical machine;
• determining a rise time constant based on the plurality of phase current samples;
• and
• determining a resistance of a winding of the AC electrical machine based on the rise time constant;
• and
• selectively activating a plurality of switches of an inverter configured to provide power to the AC electrical machine based at least on the resistance of the winding of the AC electrical machine.