ELECTRICAL MACHINE COMPRISING A ROTOR PROVIDED WITH A WINDING FOR FACILITATING SWITCHING AND RELATED STARTER

• US 20130134822A1
• Filed: 04/20/2011
• Published: 05/30/2013
• Est. Priority Date: 04/27/2010
• Status: Active Grant

• Current Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Original Assignee: Aurelien Vauquelin
• Inventors: Labbe, Nicolas, Dupeux, Benoit, Vauquelin, Aurlien
• Granted Patent: US 9,350,208 B2
• Time in Patent Office: Days
• US Class Current: 310/216.001
• CPC Class Codes: H02K 23/32 having wave or undulating windings
• CPC Class Codes: H02K 23/38 having winding or connection for improving commutation, e.g. equipotential connection
• CPC Class Codes: H02K 3/48 in slots

Abstract

A machine having a wound rotor (102) comprising a manifold (112) that includes a set of blades (131) and longitudinal notches (133). Rotor (102) also comprises a winding (108) formed of a set of conductors (134) that each comprise two arms (135.1, 135.2), connected together by a base (136). The curve, representing the electromotive force (EMF) generated by the rotor (102) on the basis of the angle of rotation of the rotor, is linear and steep in a switching region, and the notches (133) are angularly shifted relative to the blades (131) so that each notch (133) is located opposite a junction between two blades. The machine may relate to a starter fitted with the machine.

Claims

1. Rotary electrical machine comprising a wound rotor (102):

a collector (112) comprising a set of plates (131) which are designed to enter into co-operation with brushes (113, 114);

notches (133) which are provided longitudinally on the outer periphery of the rotor (102); and

a winding (108) which is formed by an assembly of conductors (134), each conductor (134) comprising two arms (135.1, 135.2) and two ends (137.1, 137.2), these two arms (135.1, 135.2) being connected to one another by a base (136);

the arms (135.1, 135.2) of a single conductor being introduced into the notches (133) according to a notch pitch k;

the ends (137.1, 137.2) of a single conductor being welded on the plates (131) according to a plate pitch 1;

wherein;

the curve which represents the electromotive force (EMF) generated by the rotor (102) according to the angle of rotation of the rotor has an abrupt linear form without a point of inflection (S) in a switching region; and

the notches (133) are offset angularly relative to the plates (131), such that each notch (133) is situated opposite a junction between two plates.

2. Machine according to claim 1, characterized in that the abrupt linear form of the curve is characterized by a gradient (K2, K3) of between 1.5 and 100 times the amplitude of the electromotive force signal (EMF), according to the angle for pi radians of variation of angle.

3. Machine according to claim 2, characterized in that it additionally comprises:

a stator (103) comprising a magnetised structure with permanent or induced magnetisation which extends according to a circumference of the stator (103);

brushes (113, 114) which are designed to permit the electrical supply to the rotor by switching of the electric current in the conductors of the rotor (102);

the stator (103) being offset angularly relative to the brushes (113, 114).

4. Machine according to claim 3, characterized in that the angular offsetting is between 1 and 45 electric degrees.

5. Machine according to claim 4, characterized in that, for a configuration with 6 poles and 25 notches, the notch pitch k is equal to 3 or 5, and the plate pitch 1 is equal to 8.

6. Machine according to claim 5, characterized in that each conductor (134) of the winding has radial symmetry relative to a radius of the rotor (102), known as the radius of symmetry (Rs).

7. Machine according to claim 6, characterized in that:

the angle (a1) formed by the radius of symmetry (Rs) and the radius of the rotor (102) which passes via the transverse cross-section of an arm (135.1) of the conductor (134) is equal to the angle (a2) formed by the radius (Rs) and the radius of the rotor (102) which passes via the transverse cross-section of the other arm (135.2) of the conductor (134); and

the angle (a3) formed by the radius of symmetry (Rs) and the radius of the rotor (102) which passes via the transverse cross-section of one of the ends of the conductor (134) is equal to the angle (a4) formed by the radius (Rs) and the radius of the rotor (102) which passes via the transverse cross-section of the other end of the conductor (134).

8. Machine according to claim 7, characterized in that, for a winding which has a notch pitch k of 3 and a plate pitch 1 of 8, if one end (137.1) of a conductor (134) is welded on the plate N, one of its arms (135.1) passes into the notch (133) situated between the plates N+2 and N+3, and its other arm (135.2) passes back into the notch (133) situated between the plates N+5 and N+6, the other end (137.2) being welded on the plate N+8.

9. Machine according to claim 7, characterized in that, for the winding configuration which has a notch pitch k of 5 and a plate pitch of 8, if one end (137.1) of a conductor (134) is welded on the plate N, one of its arms (135.1) passes into the notch (133) situated between the plates N+1 and N+2, and its other arm (135.2) passes back into the notch (133) situated between the plate N+6 and the plate N+7, the other end being welded on the plate N+8.

10. Machine according to claim 9, characterized in that the transverse cross-section of the conductors (134) of the winding is round or square or rectangular.

11. Machine according to claim 10, characterized in that a notch insulator (142) in the form of an “

S”

is installed around conductors (134) of the winding.

12. Starter (101) for a motor vehicle equipped with a rotary electrical machine according to claim 1.

13. Starter (101) according to claim 12, further comprising a stator comprising a magnetised structure with permanent magnetisation of the Halbach type.