Rotating electric machine winding temperature estimation device and rotating electric machine winding temperature estimation method

A winding temperature estimation device for a rotating electric machine comprising:

• a rotating electric machine comprising a stator, which has slots and a winding configured with a plurality of segmented conducting wires that are inserted into the slots according to a shape of the slots and that have wire widths corresponding to widths of the slots, and a rotor;
• a coolant supply part configured to supply a coolant to the winding and the stator;
• a temperature sensor configured to detect a temperature of the coolant;
• a heat reduction amount calculation part configured to calculate a heat reduction amount from the winding using the temperature of the coolant and a heat resistance of at least a portion between the coolant and the winding;
• a heating value calculation part configured to calculate the heating value based on a copper loss and an eddy current loss of the winding;
• and
• a winding temperature calculation part configured to calculate a temperature of the winding using the heat reduction amount from the winding and the heating value due to the loss of the winding.