Rotor for an electric motor energized by permanent magnet means

A rotor for an electric motor energized by permanent magnet means and comprising a substantially cylindrical rotor body with, projecting coaxially therefrom, shaft portions of which permanent magnets are located by positioning means axially and tangentially in relation to the rotor body and are fixed on the outer peripheral surface thereof, wherein the positioning means comprise in each case, disposed in the region of each end face of a rotor body, a positioning ring and, disposed between the latter and on the rotor body, at least one inner positioning ring, provided with positioning webs which extend over only a small portion of the length (L) of the outer peripheral surface of the rotor body, one positioning ring and the inner positioning ring on the one hand and mutually aligned positioning webs on the other, partially defining compartments for in each case one permanent magnet, and wherein the inner positioning ring comprises radially inwardly directed locking webs which engage an annular groove in the outer peripheral surface of the rotor body.

A rotor for an electric motor energized by permanent magnet means and comprising a substantially cylindrical rotor body with, projecting coaxially therefrom, shaft portions of which permanent magnets are located by positioning means axially and tangentially in relation to the rotor body and are fixed on the outer peripheral surface thereof, wherein the postioning means comprise in each case, disposed in the region of each end face of a rotor body, a positioning ring and, disposed between the latter and on the rotor body, at least one inner positioning ring, provided with positioning webs which extend over only a small portion of the length (L) of the outer peripheral surface of the rotor body, one positioning ring and the inner positioning ring on the one hand and mutually aligned positioning webs on the other, partially defining compartments for in each case one permanent magnet, wherein the positioning rings in each case comprise a radially inwardly protruding projection which engages a positioning groove in the outer peripheral surface of the rotor body.

A rotor for an electric motor energized by permanent magnet means and comprising a substantially cylindrical rotor body with, projecting coaxially therefrom, shaft portions of which permanent magnets are located by positioning means axially and tangentially in relation to the rotor body and are fixed on the outer peripheral surface thereof, wherein the positioning means comprise in each case, disposed in the region of each end face of a rotor body, a positioning ring and, disposed between the latter and on the rotor body, at least one inner positioning ring, provided with positioning webs which extend over only a small portion of the length (L) of the outer peripheral surface of the rotor body, one positioning ring and the inner positioning ring on the one hand and mutually aligned positioning webs on the other, partially defining compartments for in each case one permanent magnet, wherein the positioning rings are constructed as annular discs and are in each case mounted without radial clearance on a cylindrical receiving portion which is immediately adjacent the rotor body.