Patent ID: 9593986
Date: 2017-03-14
CPC Classifications: G01K

Claim:
1. A method of estimating a magnet temperature of magnets of a rotary electric machine, the rotary electric machine having a rotating member that includes the magnets, at least the rotating member of the rotary electric machine being cooled by a coolant, the method comprising: detecting a temperature of the coolant in a circulation passage of the coolant; calculating a temperature of the coolant immediately before the coolant comes into contact with the rotating member, taking the detected temperature of the coolant and a temperature change until the coolant comes into contact with the rotating member into account, estimating the magnet temperature with a magnet temperature estimator based on the temperature of the coolant immediately before the coolant comes into contact with the rotating member and a previously determined loss of the rotating member including the magnets, wherein the coolant cools the rotating member after being supplied to a transmission, and the temperature change until the coolant comes into contact with the rotating member is caused by a loss of the transmission.