MOTOR

To provide a motor that has the improved accuracy of estimating the position of a rotor.SOLUTION: A rotor included in a motor according to an embodiment has a rotor core 31 formed of a magnetic substance, a plurality of magnets 33 arranged side by side on the rotor core 31 along the direction of rotation of the rotor, and a plurality of Hall elements arranged on a common mounting surface 41a and can detect the magnetic fields of the magnets 33. The plurality of magnets 33 each have an opposite surface 38 opposite to the mounting surface 41a, and the distance between the opposite surfaces 38 and the mounting surface 41a is constant. The rotor core 31 has an opposite surface 31b opposite to the mounting surface 41a, and has first areas R1 and second areas R2 different from each other in the distance between the opposite surface 31b and the mounting surface 41a. The first areas R1 and the second areas R2 are arranged alternately along the direction of rotation of the rotor. The number of pairs each composed of one first area R1 and one second area R2 adjacent to the first area R1 is determined according to the number of pole pairs of the magnets 33.SELECTED DRAWING: Figure 7 【課題】ロータの位置推定の正確度が向上したモータを提供する。【解決手段】一実施形態に係るモータが備えるロータは、磁性体によって形成されたロータコア３１と、ロータコア３１上に、ロータの回転方向に沿って並べられた複数の磁石３３と、共通の実装面４１ａ上に配置され、磁石３３の磁界を検出可能な複数のホール素子と、を有する。複数の磁石３３のそれぞれは実装面４１ａと対向する対向面３８を有し、対向面３８と実装面４１ａとの間の距離は一定である。ロータコア３１は実装面４１ａと対向する対向面３１ｂを有し、対向面３１ｂと実装面４１ａとの間の距離が互いに異なる第１領域Ｒ１と第２領域Ｒ２とを有する。第１領域Ｒ１と第２領域Ｒ２とはロータの回転方向に沿って交互に並ぶ。１つの第１領域Ｒ１と当該第１領域Ｒ１と隣接する１つの第２領域Ｒ２とからなる組の個数は、磁石３３の極対数に応じて決まる。【選択図】図７