ROTOR AND IPM MOTOR USING THE SAME

To improve magnetic characteristics by reducing magnetic flux leaking inward of magnet arrangement, even if there is a gap between a shaft hole for inserting a revolving shaft and the magnet, when embedding a permanent magnet in the rotor core.SOLUTION: In a rotor 3 where a magnet arrangement region 19 is provided closely to the outer peripheral surface of a rotor core 8 having a shaft hole 16 in the center, multiple main magnet holding parts 17 placed in the hoop direction of the rotor core, and multiple auxiliary magnet holding parts 18 placed in the radial direction of the rotor core between the multiple main magnet holding parts, respectively, are provided, and a main magnet 11 having magnetic pole direction, in the radial direction of the rotor core, is fitted to the main magnet holding part, and an auxiliary magnet 12 having magnetic pole direction, in the hoop direction of the rotor core, is fitted to the auxiliary magnet holding part, a cavity 20 is extended in parallel with the shaft hole 16 on the inside of the auxiliary magnet holding part 18, between the magnet arrangement region 19 of the rotor core 8 and the shaft hole 16.SELECTED DRAWING: Figure 5 【課題】ロータコアの内部に永久磁石を埋設する場合において、回転軸を挿通させる軸孔と磁石との間が離れていても、磁石配列より内側に漏れる磁束を低減させて磁気特性を向上させる。【解決手段】中央に軸孔１６を有するロータコア８の外周面寄りに磁石配置領域１９を設け、この磁石配置領域に、ロータコアの周方向に沿って配置された複数の主磁石保持部１７と、複数の主磁石保持部のそれぞれの間においてロータコアの径方向に沿って配置された複数の補助磁石保持部１８と、を設け、主磁石保持部に磁極方向がロータコアの径方向に沿う主磁石１１を嵌装し、補助磁石保持部に磁極方向がロータコアの周方向に沿う補助磁石１２を嵌装したロータ３において、ロータコア８の磁石配置領域１９と軸孔１６との間であって補助磁石保持部１８の内側に軸孔１６と平行に空隙２０を延設する。【選択図】 図５