Sanyo Electric Co., Ltd.

Nasaaju Takezawa

Kazuhiko Arai

Keijiro Igarashi

Masaharu Uchibori

It is an object to provide a rotor of an electric motor in which an adverse influence due to through holes for caulking and fixing is reduced, and moreover, the number of parts is small and an assembling operation is simple, so that high characteristics can be obtained, which is constructed by: a rotor core constructed by laminating a plurality of iron plates for the rotor; at least two slots which are formed in the rotor core along the axial direction of a rotation axis; and at least four flat permanent magnets which are inserted to the slots, and in which as the permanent magnets, each pair of magnets which face each other between adjacent magnetic poles are arranged in parallel at predetermined intervals so as to sandwich a normal line of the rotor. In addition, the permanent magnet rotor is made to satisfy the condition: L/D being between 0.3 and 1.2 and t/I being between 0.02 and 0.2, wherein L is the thickness of the laminations, D is the diameter of the rotor core, t is the thickness of the permanent magnets, and I is the length of the permanent magnets.

Growing community of inventors

Gunma-ken, Japan

Nasaaju Takezawa