Patent ID: 6147428
Filing Date: 2000-11-14
Classification: H02K

Abstract:
A rotor for an electric motor comprising:a rotor core formed by a plurality of laminations of plates of magnetic material and having a longitudinal central axis;a plurality of pairs of slots spaced around said core and along its length, the slots of a pair being opposed and generally parallel to each other, and the portion of the rotor core between the slot of one pair and the next adjacent slot of the next adjacent pair defining a magnetic pole portion of the rotor; anda permanent magnet in each of said slots, said magnets being generally parallel to each other; andwherein for an outer diameter D of the rotor core a thickness of the laminations being L, a thickness of magnet being t, and a length of magnet being I, the rotor is constructed such that:0.30<L/D<1.20. . . (1)0.02<t/I<0.20. . . (2).