Abstract: The present invention comprises a permanent magnet (13) that is disposed around a rotor shaft (11), a retaining ring (14) that is press-fitted around the outside of the permanent magnet (13) from one end of the rotor shaft (11) so as to retain the permanent magnet (13) against the rotor shaft (11), and an end plate (12) that is provided adjacent to the permanent magnet (13) in the axial direction of the rotor shaft (11) and guides the press-fitted retaining ring (14), maintaining planar contact with the inner circumferential surface thereof, toward the permanent magnet (13) while causing the retaining ring (14) to expand as the retaining ring (14) progresses from one end of the rotor shaft (11) to the other end of the rotor shaft (11). Concentration of stress on the retaining ring (14) during press-fitting can thus be minimized.

Abstract: The present invention comprises a permanent magnet (13) that is disposed around a rotor shaft (11), a retaining ring (14) that is press-fitted around the outside of the permanent magnet (13) from one end of the rotor shaft (11) so as to retain the permanent magnet (13) against the rotor shaft (11), and an end plate (12) that is provided adjacent to the permanent magnet (13) in the axial direction of the rotor shaft (11) and guides the press-fitted retaining ring (14), maintaining planar contact with the inner circumferential surface thereof, toward the permanent magnet (13) while causing the retaining ring (14) to expand as the retaining ring (14) progresses from one end of the rotor shaft (11) to the other end of the rotor shaft (11). Concentration of stress on the retaining ring (14) during press-fitting can thus be minimized.

Abstract: In a rotor structure of a permanent magnet type rotary machine comprising a cylindrical permanent magnet 3 fixed on an outer peripheral surface of a rotor shaft 2, wherein torque acting on the permanent magnet 3 is transmitted to the rotor shaft 2, the rotor structure further comprises two annular side plates 4 and a holding ring 5. Each side plate has an axial hole 4a into which the rotor shaft 2 is fitted so as to rotate with the side plates integrally and the side plates 4 are attached on the both end surface of the permanent magnet 3, respectively so as to confront with each other. A circular U-shaped groove 4c coaxially with the axial hole 4a is provided at a end surface 4b for facing with the permanent magnet 3 of each side plate 4. The holding ring 5 is formed cylindrically and covers circumferential sections of the permanent magnet 3 and the side plates 4 and fasten the permanent magnet 3 and the side plates 4 so as to move them integrally.

Abstract: In a rotor structure of a permanent magnet type rotary machine comprising a cylindrical permanent magnet 3 fixed on an outer peripheral surface of a rotor shaft 2, wherein torque acting on the permanent magnet 3 is transmitted to the rotor shaft 2, the rotor structure further comprises two annular side plates 4 and a holding ring 5. Each side plate has an axial hole 4a into which the rotor shaft 2 is fitted so as to rotate with the side plates integrally and the side plates 4 are attached on the both end surface of the permanent magnet 3, respectively so as to confront with each other. A circular U-shaped groove 4c coaxially with the axial hole 4a is provided at a end surface 4b for facing with the permanent magnet 3 of each side plate 4. The holding ring 5 is formed cylindrically and covers circumferential sections of the permanent magnet 3 and the side plates 4 and fasten the permanent magnet 3 and the side plates 4 so as to move them integrally.