MOTOR SINTERED MAGNET, MANUFACTURING METHOD THEREOF, AND PERMANENT MAGNET TYPE SYNCHRONOUS MOTOR

To provide a manufacturing method of a motor sintered magnet capable of improving the yield of a magnet material and reducing a processing time of grinding without reducing the performance of a motor.SOLUTION: A manufacturing method of a motor sintered magnet according to the present disclosure includes a step a of preparing a sintered magnet having a convex first main surface, a second main surface opposite to the first main surface, and side surfaces, a step b of forming a reference plane on a part of the first main surface by partially grinding the top of the first main surface of the sintered magnet, and a step c of forming a surface defining the length and/or width of the sintered magnet by grinding at least a part of the side surface of the sintered magnet, and the sintered magnet having the first main surface including the reference plane as a motor sintered magnet is manufactured.SELECTED DRAWING: Figure 5 【課題】モータの性能を低下させることなく、磁石材料の歩留り向上および研削加工の工程時間短縮を実現し得るモータ用焼結磁石の製造方法を提供する。【解決手段】本開示のモータ用焼結磁石の製造方法は、凸状の第１主面、前記第１主面の反対側の第２主面、および側面を有する焼結磁石を用意する工程ａと、焼結磁石の第１主面の頂上部を部分的に研削することによって第１主面の一部に基準平面を形成する工程ｂと、焼結磁石の側面の少なくとも一部を研削することによって焼結磁石の長さおよび／または幅を規定する面を形成する工程ｃとを含み、モータ用焼結磁石として第１主面が前記基準平面を含む焼結磁石を作製する。【選択図】図５