Permanent magnet electric motor
A rotor includes permanent magnets, an annular outer periphery side iron core (first core) disposed on the inner diameter side of the permanent magnets, an annular inner periphery side iron core (second core) disposed on the inner diameter side of the first core, and an insulating member insulating the first core and the second core from each other. The first core includes positioning convex portions protruding from the outer periphery toward the outer diameter side, formed in the circumferential direction and positioning the permanent magnets, and outer periphery side rotation locking concave portions being concave from the inner periphery toward the outer diameter side and formed in the circumferential direction. The positioning convex portions and the outer periphery side rotation locking concave portions are formed in positions overlapping each other when viewed in the radial direction from the central axis of the second core.
1. A permanent magnet electric motor, comprising
a stator and a rotor disposed inside the stator,
wherein the rotor is provided with:
a plurality of permanent magnets arranged annularly;
an annular outer periphery side iron core disposed on an inner diameter side of the plurality of permanent magnets;
an annular inner periphery side iron core disposed on an inner diameter side of the outer periphery side iron core;
an insulating member formed of a resin between the outer periphery side iron core and the inner periphery side iron core and insulating the outer periphery side iron core and the inner periphery side iron core from each other; and
a shaft provided along a central axis of the inner periphery side iron core,
wherein the outer periphery side iron core is provided with:
a plurality of positioning convex portions protruding from an outer periphery toward an outer diameter side, formed in a circumferential direction and positioning the permanent magnets;
a plurality of rotation locking concave portions being concave from an inner periphery toward the outer diameter side and formed in the circumferential direction; and
a plurality of outer periphery side concave portions being concave from the outer periphery toward the inner diameter side and formed in the circumferential direction, and
wherein on the outer periphery side iron core, each rotation locking concave portion is formed in a respective position overlapping one of the plurality of positioning convex portions when viewed in a radial direction from the central axis of the inner periphery side iron core.
2. The permanent magnet electric motor according to claim 1 , wherein the plurality of outer periphery side concave portions are formed on both circumferential sides of each positioning convex portion.
3. The permanent magnet electric motor according to claim 1 , wherein the insulating member is formed by integrally molding the resin with the outer periphery side iron core and the inner periphery side iron core.