Patent ID: 9641031
Date: 2017-05-02
CPC Classifications: H02K

Claim:
1. A rotor ( 1 ) of a rotary electrical machine comprising a plurality of alternating North (N) poles and South (S) poles formed from a plurality of permanent magnets ( 3 ) arranged in first recesses ( 4 ) which extend along an axis (X-X′) of said rotor ( 1 ), and are distributed regularly between a circumferential part ( 5 ) and a central part ( 6 ) of a magnetic body ( 2 ) of said rotor ( 1 ), to define a plurality of circumferential polar sections ( 7 ), said permanent magnets ( 3 ) having a first polygonal radial section and a first axial plane of symmetry, said permanent magnets ( 3 ) also having a substantially rectangular cross-section and are chamfered in the form of a wedge toward the axis of said rotor and said circumferential part ( 5 ) comprising axial grooves ( 8 ) which are arranged between said polar sections ( 7 ), facing said permanent magnets ( 3 ), and forming the openings of said first recesses ( 4 ), wherein said opening ( 8 ) has a first predetermined width (a), to minimize a magnetic leakage flux (ΦL,) which circulates in a circumferential direction in said circumferential part ( 5 ), and to maximize a useful magnetic flux (ΦU) which circulates radially in each of said polar sections ( 7 ), said circumferential part ( 5 ) has a predetermined opening ratio (g), to minimize said magnetic leakage flux (ΦL), and to maximize said useful magnetic flux (ΦU), said opening ratio being equal to a first ratio of said first width (a) to a second width (w) of said permanent magnets ( 3 ) in a circumferential direction, and said opening ratio (g) is substantially contained between 0.35 and 0.8.