Patent ID: 9577481
Date: 2017-02-21
CPC Classifications: H02K

Claim:
1. A rotor for an electric machine comprising: a rotor core having a plurality of flux guide sections located along a circumferential direction of the rotor core, each of the plurality of flux guide sections establishing a plurality of flux paths made of a material of high permeance and a plurality of flux barriers made of a material of low permeance located alternately along a radial direction of the flux guide section, each of the plurality of flux barriers extending from a first extremity to a second extremity, the first and the second extremities being situated adjacent a surface of the rotor core and being spaced apart from one another in a circumferential direction, each of the plurality of flux barriers defining a corresponding imaginary centre line extending from a first point on a rotor surface to a second point on a rotor surface, the first point and the second point being spaced apart from one another at the rotor surface in a circumferential direction of the rotor, the rotor core including: a plurality of bridges made of a material of high permeance, each of the plurality of bridges extending across a corresponding flux barrier; a plurality of permanent magnets, each one of which is located adjacent a corresponding bridge and configured to saturate the corresponding bridge, a magnetization direction of each of the plurality of permanent magnets diverging from a direction in which the corresponding bridge extends across the flux barrier; and a plurality of rotor sheets having stacked in an axial direction, each of the plurality of rotor sheets comprising a plurality of flux guide sections located along a circumferential direction of the rotor sheet, the plurality of flux guide sections of the rotor core being formed by the plurality of flux guide sections of the stacked rotor sheets, and the plurality of permanent magnets include at least one axial magnet located axially adjacent a corresponding bridge, each axial magnet being axially pressed between two elements at least one of which is a bridge corresponding to the axial magnet.