Electrical machine comprising rotor provided with winding facilitating switching, and associated starter

• US 9,350,208 B2
• Filed: 04/20/2011
• Issued: 05/24/2016
• Est. Priority Date: 04/27/2010
• Status: Expired due to Fees

• Current Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Original Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Inventors: Labbe, Nicolas, Vauquelin, Aurlien, Dupeux, Benoit
• Primary Examiner(s): Mok, Alex W
• Application Number:
  US13/641,524
• Publication Number:
  US 20130134822A1
• Time in Patent Office: 1,861 Days
• Field of Search: 310/216.001, 310/207, 310/233
• US Class Current: 1/1
• 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. A rotary electrical machine comprising a wound rotor (102) having an axis of rotation (X), the rotor comprising:

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) configured to permit the electrical supply to the rotor by switching of the electric current in the conductors of the rotor (102), the brushes (113, 114) being offset angularly relative to the stator (103);

a collector (112) comprising a set of plates (131) which are designed to enter into co-operation with the 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) each having a distal end (137.1, 137.2), the two arms (135.1, 135.2) being connected to one another by a base (136) so as to form a U-shaped conductor;

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

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

a curve representing the electromotive force (EMF) generated by the rotor (102) according to an 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) being offset angularly relative to the plates (131), such that each of the notches (133) is situated opposite a junction between two plates;

the notch pitch k is not equal to the plate pitch 1;

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;

the angular offsetting of the brushes is between 1 and 45 electric degrees.

2. The machine according to claim 1, wherein, 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.

3. The machine according to claim 2, wherein each conductor (134) of the winding has radial symmetry relative to a radius of the rotor (102), known as a radius of symmetry (Rs).

4. The machine according to claim 3, wherein:

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

an 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).

5. The machine according to claim 4, wherein, 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.

6. The machine according to claim 4, wherein, 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.

7. The machine according to claim 6, wherein the transverse cross-section of the conductors (134) of the winding is one of round, square and rectangular.

8. The machine according to claim 7, wherein a notch insulator (142) in the form of an “

S”

is installed around conductors (134) of the winding.