Patent ID: 7317272

Claim:
A rotor for an electric motor of an outer rotor type having a stator, the rotor comprising: a base plate made of a magnetic material and coupled to a rotational shaft; a rotor core provided on the base plate and including a protrusion protruding axially relative to the base plate and teeth of the stator; a plurality of magnet insertion portions defined in the rotor core; a plurality of rotor magnets provided in the magnet insertion portions respectively, each magnet having a stator side and a counter-stator side both magnetized so as to have poles differing from each other; and a position sensor detecting a rotational position of the rotor core and disposed radially or axially opposite the outer peripheral face or the axial end of the rotor core so as to correspond to the protrusion, wherein the rotor core has a plurality of a slits formed therein so as to be located between the rotor magnets peripherally adjacent to each other, each slit having an open outer peripheral face.