Magnet temperature estimating device for motor and hybrid vehicle provided with the same

A magnet temperature estimating device for a motor provided with a rotor having magnets and configured to output a rotational motive force, and a stator having a plurality of coils opposing the rotor with a gap therebetween, the device comprising:

• a sensor configured to detect an induced voltage induced by rotation of the rotor;
• and
• a controller configured to control the motor by supplying power to the plurality of coils in response to an input of a detection signal from the sensor,
• wherein apertures adjacent to each magnet in a rotation direction of the rotor are formed in the rotor,
• wherein the controller estimates a temperature of one of the magnets based on the induced voltage detected when the one magnet opposes any one of the plurality of coils, according to the rotation of the rotor, and
• wherein the controller stores in advance a timing at which a center part of the one magnet in the rotation direction crosses a center axis line of each of the plurality of coils as the rotor rotates, and acquires the induced voltage at the stored timing.