Patent ID: 6737781
Filing Date: 2004-05-18
Classification: H02K

Abstract:
A rotor for an electric rotary machine comprising:a rotor yoke having a cylindrical peripheral wall with a first axial end and a second axial end opposite the first axial end, a bottom wall provided integrally with said peripheral wall so as to close the first axial end of said peripheral wall, and a boss provided at a central portion of said bottom wall for mounting a rotary shaft, and an inductor forming member fitted onto the outer surface of said peripheral wall, said inductor forming member having a ring-like portion and inductor magnetic poles formed on an outer surface of said ring-like portion, said ring-like portion having a first axial end and a second axial end opposite the first axial end of the ring-like portion, and an inner surface of said ring-like portion fitted against the outer surface of said peripheral wall of the rotor yoke, said peripheral wall further comprises an inner surface and an outer surface and at least one protrusion on the outer surface of the peripheral wall, said protrusion including a first protrusion portion extending in an axial direction of said rotor yoke and a second protrusion portion extending in a circumferential direction of said rotor yoke at a first end of said first protrusion portion, said first protrusion portion including a projection extending from a second end of said first protrusion portion, said inner surface of said ring-like portion further comprising at least one recess corresponding to each first protrusion portion so that each first protrusion portion is engaged with a corresponding recess, wherein said second protrusion portion is located against the first axial end of said ring-like portion and said projection is against the second axial end of the ring-like portion when said ring-like portion is fitted against said peripheral wall of the rotor yoke.