Patent ID: 9293954
Filing Date: 2016-03-22
CPC Classification: H02K

Claim Text:
1. A rotor of a motor in which a permanent magnet is inserted into a slot formed inside of the rotor, the slot being formed with: a first inner wall surface which comprises a flat surface having a depth extending in parallel to a rotational axis of the motor and a width located between the rotational axis of the motor and an outer periphery of the rotor in a cross-section perpendicular to the rotational axis and extending in the cross-section perpendicular to an imaginary plane that includes the rotational axis and bisects the first inner wall surface in the cross-section; a second inner wall surface which has a depth extending in parallel to the depth of the first inner wall surface and a width located in the cross-section radially outward of the first inner wall surface and extending in the cross-section in parallel with the width of the first inner wall surface; and a pair of side wall surfaces shaped symmetrically in the cross-section with respect to the imaginary plane; wherein the width of the second inner wall surface is longer than the width of the first inner wall surface in the cross-section; and wherein the pair of side wall surfaces each comprise a flux barrier wall surface extending in the cross-section outwardly from one end of the second inner wall surface to a terminal end of the flux barrier wall surface in an arcuate manner almost along its entire length so that both of the flux barrier wall surfaces are co-extensive in the cross-section almost along their entire lengths with a single imaginary circle running in the cross-section between the outer periphery of the rotor and the second inner wall surface, the imaginary circle having a center in the cross-section between the rotational axis and the first inner wall surface on an intersecting line between the imaginary plane and the cross-section and so that in each of the flux barrier wall surfaces, a radial distance in the cross-section between the outer periphery of the rotor and the flux barrier wall surface, which is measured at a location in the cross-section on the flux barrier wall surface, becomes wider as the location moves along the flux barrier wall surface away from the second inner wall surface in the cross-section.