Patent ID: 9647500
Date: 2017-05-09
CPC Classifications: H02K

Claim:
1. A rotor for a rotating electric machine comprising: a rotor core that is disposed such as to oppose a stator in a radial direction of the rotor, a plurality of magnet housing holes being formed in the rotor core and arrayed in a circumferential direction of the rotor; and a plurality of magnets, each housed in the magnet housing hole, that form a plurality of magnetic poles arrayed in the circumferential direction and are fixed and held in the magnet housing holes by a filler material, the rotor core including: a q-axis core portion formed between two magnetic poles that are adjacent to each other in the circumferential direction; an outer flux barrier that is formed between the q-axis core portion and the magnet and is filled with the filler material; and a bridge portion that is formed between a stator-side core portion positioned on the stator side of the magnet housing hole and the q-axis core portion, the bridge portion including a large-width portion, a small-width portion and a medium-width portion that are sequentially disposed from the side of the q-axis core portion towards the side of the stator-side core portion in the circumferential direction, the large-width portion having the largest radial-direction width in the bridge portion, the small-width portion having the smallest radial-direction width in the bridge portion, the medium-width portion having a medium radial-direction width between the radial-direction width of the large-width portion and the radial-direction width of the small-width portion, wherein: the stator-side core portion includes a projecting portion projecting towards the side of the q-axis core portion from a corner portion as a starting point at which a stator-side end surface and a q-axis core portion-side end surface of the magnet housed in the magnet housing hole meet; the rotor core is configured such that α/θ is set to 9% or more, where α/θ is a pole-arc factor of the q-axis core portion, α is an angle of a circumferential-direction width of the q-axis core portion and θ is an angle of a pole pitch per single magnetic pole of the magnets; the rotor core is configured such that β/θ is set to 12% or more, where β/θ is a pole-arc factor of the bridge portion, β is an angle of a circumferential-direction width of the bridge portion and θ is an angle of a pole pitch per single magnetic pole of the magnets; the bridge portion is configured such that a dimensional ratio of radial-direction widths of the large-width portion, the small-width portion, and the medium-width portion is in a range of an area enclosed by line segments in a coordinate system; the coordinate system has a vertical axis and a horizontal axis, the line segments includes: a first line segment that connects a first point and a second point; a second line segment that connects the second point and a third point; a third line segment that connects the third point and a fourth point; and a fourth line segment that connects the fourth point and the first point; and a dimensional ratio of the radial-direction width of the large-width portion the radial-direction width of the small width portion to the radial-direction width of the medium-width portion is set to: (i) 1.65:1.00:1.05 at the first point; (ii) 1.70:1.00:1.05 at the second point; (iii) 1.75:1.00:1.10 at the third point; and (iv) 1.65:1.00:1.18 at the fourth point.