Sanyo Electric Co., Ltd.

Masaharu Uchibori

Kazuhiko Arai

Keijiro Igarashi

Takashi Miyauchi

Tomonori Kinoshita

Nasaaju Takezawa

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.

Rotor of electric motor

A rotor of an electric motor for a compressor which can prevent the generation of an eddy current, reduce the flux leakage between adjacent magnetic poles, thereby enhancing the operation efficiency of the motor and reducing the size of the compressor. A first end surface member formed from a nonmagnetic material, a second end surface member formed from a nonmagnetic member and a rotor core are integrally caulked by a caulking member. The rotor core is provided with a gap for preventing the short circuit of the magnetic flux caused between adjacent magnetic poles. The gap communicates with a through hole into which the caulking member is inserted.

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Gunma-ken, Japan

Masaharu Uchibori