Rotating electrical machine, in particular for a motor vehicle starter

摘要

A direct-current rotating electrical machine, in particular for a motor vehicle starter. The machine includes a stator comprising a magnetized structure with permanent magnetization, extending along a circumference of the stator, a rotor, and a group of brushes arranged to allow the electrical supply of the rotor by switching the electrical current in sections of the rotor. The magnetized structure of the machine includes a plurality of main magnets and a plurality of auxiliary magnets, each arranged between two main magnets. The auxiliary magnets have a smaller angular extent and/or radial thickness than the main magnets. The magnetization vector in at least one of the main and auxiliary magnets varies continuously or in steps, at least locally taking a direction other than radial and orthoradial directions.

主权项

1. A direct current rotating electrical machine, the machine comprising:
a stator (3) comprising a magnetized structure with permanent magnetization extending along a circumference of the stator; a rotor (2); and a group of brushes (13, 14) arranged to allow the electrical supply of the rotor by switching the electrical current in sections of the rotor, the magnetized structure (5) of the stator including at least one sector between two consecutive magnetic poles (N; S) of the magnetized structure, the at least one sector having a magnetization direction varying essentially sinusoidally along the circumference of the stator (3); an angular displacement of a neutral line selected so as to improve switching when the electrical machine is in operation; the magnetized structure (5) including at least two magnets (150); at least one of the magnetic poles (N; S) of the magnetized structure (5) positioned at a circumferential end (151) of one of the magnets; the magnetization direction within the one of the magnets on the circumferential end thereof being substantially radial; the electrical machine comprising a number Nb of the poles; the magnetized structure (5) including a number Nb of the magnets, arranged adjacent to each other.