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

Patent metadata

Field	Value
Publication number	US-9373989-B2
Application number	US-201113884776-A
Country	US
Kind code	B2
Filing date	Nov 10, 2011
Priority date	Nov 22, 2010
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

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.

First claim

The invention claimed is:

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 ).

2. Voltage regulator/brush-holder assembly in a single piece ( 1 ) for a rotary electrical machine according to claim 1 , characterized in that said first inner grooves corresponding respectively to the first and second longitudinal receptacles ( 7 ) have separate respective first straight sections.

3. Voltage regulator/brush-holder assembly in a single piece ( 1 ) for a rotary electrical machine according to claim 1 , characterized in that each of said first and second receptacles ( 7 ) is also provided with at least a second inner longitudinal groove ( 10 ) which has a third straight section cross sectional area which is smaller than, or equal to, said cross sectional area of said first straight section.

4. Voltage regulator/brush-holder assembly in a single piece ( 1 ) for a rotary electrical machine according to claim 1 , characterized in that said first straight section cross sectional shape is a first rectangle, with dimensions substantially equal to 2.0 mm×1.8 mm.

5. Voltage regulator/brush-holder assembly in a single piece ( 1 ) for a rotary electrical machine according to claim 1 , characterized in that said second straight section is globally a second rectangle, the large sides of which each have an inner surface part ( 13 ) in the form of an arc of a circle.

6. Voltage regulator/brush-holder assembly in a single piece ( 1 ) for a rotary electrical machine according to claim 1 , characterized in that said body ( 6 ) comprises cooling fins ( 14 ) parallel to said axial direction (XX′) arranged on at least one longitudinal surface ( 15 ).

7. Voltage regulator/brush-holder assembly in a single piece ( 1 ) for a rotary electrical machine according to claim 6 , characterized in that said fins ( 14 ) have a profile which is square or triangular or trapezoidal.

8. Voltage regulator/brush-holder assembly in a single piece ( 1 ) for a rotary electrical machine according to claim 6 , characterized in that said fins ( 14 ) are provided on said longitudinal surface ( 15 ) which is opposite said voltage regulator ( 5 ).

9. Voltage regulator/brush-holder assembly in a single piece ( 1 ) for a rotary electrical machine according to claim 6 , characterized in that said fins ( 14 ), of which there are 12, have a longitudinal pitch which is substantially equal to 2 mm, and a height of approximately 0.9 mm.

Assignees

• Godefroy Gregory
• Tisserand Pierre
• Dugue Christophe
• Sassane Khalid
• Valeo Equip Electr Moteur

Inventors

• Godefroy Gregory
• Tisserand Pierre
• Dugue Christophe
• Sassane Khalid

Classifications

• H01R39/38

  Brush holders · CPC title

• H02K9/28 Primary

  Cooling of commutators, slip-rings or brushes e.g. by ventilating · CPC title

• H02P9/14

  by variation of field (H02P9/08, H02P9/10 take precedence) · CPC title