Rotor structure of interior permanent magnet motor

A rotor structure of an interior permanent magnet motor comprising:

• a rotating shaft and an iron core arranged on the rotating shaft;
• a plurality of magnet grooves disposed inside the iron core along a circumferential direction, the plurality of magnet grooves being divided into a number of pairs, and each pair of magnet grooves being symmetrically arranged with respect to a direct axis (d-axis) of the motor;
• a magnet disposed in at least one of the plurality of magnet grooves;
• wherein an anti-demagnetization groove is provided respectively at upper and lower ends of a long side of each of the magnet grooves that is adjacent to a circumferential edge arc of the iron core, the anti-demagnetization groove is communicated with the magnet groove and used to reduce demagnetization at corners of the magnet, and
• wherein an edge line of the anti-demagnetization groove comprises directly-connected straight line segments or directly-connected arc segments that are directly connected with a long side of the magnet groove that is adjacent to the circumferential edge arc of the iron core, and the directly-connected straight line segments or the directly-connected arc segments are not parallel to a long side of the magnet and tilt or extend toward the circumferential edge arc of the iron core.