One-piece voltage regulator/brush-holder assembly for a rotary electrical machine and rotary electrical machine including such an assembly

摘要

An electrical machine such as an alternator or starter-alternator for a motor vehicle which is fitted with the one-piece voltage-regulator/brush-holder assembly (1). The brush-holder (6) is capable of guiding at least first and second brushes by means of respective first and second longitudinal recesses (7). The recesses are substantially parallelepiped, made of an electrically insulating material and extend substantially in an axial plane of a rotor of the machine. Each recess is provided with at least one respective longitudinal internal groove (9) in communication with at least one channel (11) provided in a body (6) of the assembly (1), in an axial direction (XX′) of the rotor, and intended for a coolant (8) to pass therethrough. A first cross section of the first internal groove is between 5% and 7% of a second cross section of the recesses.

主权项

1. A Voltage regulator/brush-holder assembly in a single piece (1) for an alternator or alternator-starter rotary electrical machine of a motor vehicle, said brush-holder (6) adapted to guide at least first and second brushes, in contact with two corresponding collector rings of a rotor of said machine, by means of respective first and second longitudinal receptacles (7) provided in the direction of said collector rings, in a substantially parallelepiped body (6) made of electrically insulating material which extends substantially on an axial plane of said rotor, each of said first and second receptacles (7) being provided with at least a respective first inner longitudinal groove (9) positioned alongside and parallel respectively to said first and second receptacles, and further in communication with at least one channel (11), which is provided in said body and extends in an axial direction (XX′) of said rotor, and is designed to have a cooling fluid (8, 12) passing through it, wherein a first straight section of said first inner groove (9) has a cross sectional area of between 5% and 7% of a cross sectional area of a second straight section of said receptacles (7).