Magnet for IPM rotor, IPM rotor, and method of manufacturing magnet for IPM rotor

A magnet for an interior permanent magnet (IPM) rotor inserted into a rotor core in an inserting direction along an axial direction thereof and buried in the rotor core in a circumferential direction thereof,

• wherein the magnet is formed such that a shape thereof is a parallelogram having opposing sides when seen in a plan view from the inserting direction;
• wherein the magnet is constituted by two split magnets formed by cutting one magnet having a rectangular shape when seen in the plan view along a diagonal line that diagonally connects opposite sides of the one magnet, and
• as the two split magnets are disposed such that the diagonal line becomes the opposing sides, the shape is formed to be a parallelogram when seen in the plan view;
• and
• wherein
• there is provided with a plurality of slots formed in the circumferential direction of the rotor core and into which the two split magnets are inserted,
• each of the slots is formed such that a longitudinal direction thereof is along the circumferential direction of the rotor core,
• a center rib is formed between a pair of the slots which are next to each other in the circumferential direction of the rotor core, the center rib extending in a radial direction of the rotor core,
• the pair of the slots is formed in symmetrical shape about the center rib, and
• the diagonal lines of the two split magnets disposed at one side of the center rib and the diagonal lines of the two split magnets disposed at another side of the center rib are symmetrically disposed about the center rib.