Double-excitation rotating electrical machine for adjustable defluxing

• US 20060119206A1
• Filed: 08/13/2003
• Published: 06/08/2006
• Est. Priority Date: 08/14/2002
• Status: Active Grant

• Current Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Original Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Inventors: Akemakou, Antoine Dokou
• Granted Patent: US 7,701,104 B2
• Time in Patent Office: Days
• US Class Current: 310/181
• CPC Class Codes: H02K 21/042 with permanent magnets and field winding both rotating

Abstract

The invention concerns a rotating electrical machine comprising a stator enclosing a rotor including permanent excitation magnets (20, 24, 26, 30) capable of producing magnetic fluxes, and excitation coils (22, 28), capable of being excited or not and generating flux constituents which can counter the fluxes generated in the magnets, wherein the number (Na) of magnets and the number (Nb) of excitation coils as well as the mutual arrangement of the coils and the magnets relative to one another from an elementary pattern (me), said numbers Na of magnets, Nb of coils and Nme of elementary patterns capable of being modified depending on the desired basic intensity (Ibase) in the machine, said basic intensity being determined when the coils are not excited and on the desired modulation intensity (Imod) in the machine, said modulation intensity being determined when the coils are excited.

Claims

1. A rotating electrical machine that has a rotor with a body made of magnetic materials, a stator surrounding the rotor;

the stator has at least one armature coil, and the rotor has closed notches in the body and devices to selectively establish closed magnetic circuits passing around the armature coil of the stator;

these devices include;

permanent excitation magnets (20, 24, 26, 30, 40, 46) able to generate magnetic fluxes;

excitation coils (22, 28, 42, 44, 48, 50) housed in the notches of the rotor to define coiled poles;

said coils are able to be excited and generate magnetic flux components to counter the fluxes generated by at least some of the magnets to create defluxing;

characterized by the fact that the number Na of magnets and the number Nb of excitation coils and the arrangement of the coils and magnets in relation to each other form an elementary pattern (me);

this elementary pattern can be repeated a number Nme of times.

2. Rotating electrical machine according to claim 1, characterized by the fact that Na is equal to or greater than 1, Nb is equal to or greater than 1, Nme is equal to or greater than 1, and the pair Na, Nb is different than 1.1.

3. Rotating electrical machine according to claim 1, characterized by the fact that the magnets Na of the same elementary pattern are arranged to generate a radial magnetic flux.

4. Rotating electrical machine according to claim 3, characterized by the fact that the magnets in the same elementary pattern have the same polarity.

5. Rotating electrical machine according to claim 1, characterized by the fact that the coil poles in the same elementary pattern have the same polarity.

6. Rotating electrical machine according to claim 1, characterized by the fact that is has, within an elementary pattern, at least two consecutive magnets separated by at least one reluctance pole.

7. Rotating electrical machine according to claim 1, characterized by the fact that it has, within an elementary pattern, at least two consecutive coil poles separated by at least one reluctance pole.

8. Rotating electrical machine according to claim 1, characterized by the fact that it has, within an elementary pattern, at least one coil pole and a consecutive magnet separated by at least one reluctance pole

9. Rotating electrical machine according to claim 1, characterized by the fact that the winding strands of a coil belonging to an elementary pattern are held in two adjacent notches placed between two consecutive magnets.

10. Rotating electrical machine according to claim 1, characterized by the fact that several elementary patterns are associated with each other.

11. Rotating electrical machine according to claim 10, characterized by the fact that the elementary patterns are different.

12. Rotating electrical machine according to claim 10, characterized by the fact that it has, between at least two consecutive elementary patterns, a succession of at least one pair of North-South or South-North poles created by at least one magnet.

13. Rotating electrical machine according to claim 12, characterized by the fact that at least one magnet inserted between two consecutive elementary patterns has a different polarity from at least one magnet belonging to at least one elementary pattern.

14. Rotating electrical machine according to claim 1, characterized by the fact that the Nb coils are not all excited simultaneously

15. Rotating electrical machine according to claim 1, characterized by the fact that the intensity of modulation (Imod) is in an interval between −

Ib and +Ib, where Ib is the maximum intensity of the magnetic flux supplied by the Nb coils.

16. Rotating electrical machine according to claim 1, characterized by the fact that there is a residual magnetic flux (Fr) coming from the magnets which is not subject to the influence of the defluxing magnetic flux (Fd) produced by the excitation coils.

17. Rotating electrical machine according to claim 1, characterized by the fact that it consists of an automobile alternator.

18. Rotating electrical machine according to claim 1, characterized by the fact that it consists of an automobile alternator-starter.