Electric machine with multiple air gaps and a 3D magnetic flux

Patent metadata

Field	Value
Publication number	US-9685828-B2
Application number	US-201414147874-A
Country	US
Kind code	B2
Filing date	Jan 6, 2014
Priority date	Jan 9, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

An electric machine includes a stator and a rotor, with the stator being equipped with at least one annular exciter unit that includes a coil and at least two annular yokes, with the rotor being equipped with a structure and at least one annular receiver unit. Each receiver unit includes at least two rows of magnets. Two sides of each yoke include teeth distributed angularly in a regular manner, and the teeth of the two adjacent yokes fit onto a face of the exciter unit, alternately forming north poles and south poles. Each row of the magnets is positioned opposite one face, forming an air gap with the exciter unit, with the electric machine thus including at least two air gaps, with a 3D magnetic flux thus circulating inside the said electric machine, dividing and regrouping itself in the vicinity of the magnets and of the yokes.

First claim

What is claimed is:

1. An electric machine with multiple air gaps and a 3D magnetic flux, including:
an axis of rotation;
a stator equipped with an armature and at least one annular exciter unit that includes a coil, a first annular yoke, and a second annular yoke, with the coil being positioned inside the first and second yokes and having at least two faces, each respective yoke of the first and second yokes including a respective plurality of teeth; and
a rotor revolving around the axis of rotation and equipped with a structure and at least one annular receiver unit, with each respective receiver unit of the at least one receiver unit including a plurality of magnets and cooperating with a single respective exciter unit of the at least one exciter unit, with each magnet having a magnet north pole and a magnet south pole, with one of the magnet north pole and the magnet south pole being located opposite the respective exciter unit and with the other of the magnet north pole and the magnet south pole being located opposite the structure of the rotor, with the total number of magnets being equal to the total number of the teeth;
wherein each respective yoke includes at least two respective extreme sides, the respective plurality of teeth of each respective yoke being distributed angularly along the two respective extreme sides in a regular manner about the axis of rotation, the respective pluralities of teeth of the first and second yokes being fitted into each other on one of the faces while maintaining a distance therebetween, alternately forming tooth north poles and tooth south poles, with each respective receiver unit of the at least one receiver unit including at least two rows of respective magnets of the plurality of magnets, with each row including an alternation of magnet north poles and of magnet south poles, and being located facing one of the faces, with the magnets being distributed angularly in a regular manner about the axis of rotation, thus forming an air gap between each row of magnets and the respective exciter unit, with a magnetic flux thus circulating in three dimensions inside the electric machine.

2. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein the magnets are permanent magnets.

3. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein the magnets are non-permanent magnets.

4. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein a respective extreme side of the first yoke and the second yoke is positioned perpendicular to the axis of rotation, so that the magnetic flux circulates at least axially inside the electric machine.

5. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein a respective extreme side of the first yoke and the second yoke is positioned parallel to the axis of rotation, so that the magnetic flux circulates at least radially inside the electric machine.

6. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein each tooth is in a cat's-tongue shape.

7. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein each tooth is in a stairway shape.

8. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein each respective yoke includes a connection in the form of a chamfer at the base of each respective tooth.

9. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein the respective exciter unit of the at least one exciter unit includes a third yoke and cooperates with the respective receiver unit of the at least one receiver unit that includes a third row of magnets, with three air gaps thus being formed between the respective exciter unit and the respective receiver unit.

10. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein the respective exciter unit of the at least one exciter unit includes a third yoke and a fourth yoke and cooperates with the respective receiver unit that includes a third row and a fourth row of magnets, with four air gaps thus being formed between the respective exciter unit and the respective receiver unit.

11. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein the stator includes at least two respective exciter units distributed radially with respect to the axis of rotation and the rotor includes at least two respective receiver units distributed radially with respect to the axis of rotation.

12. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein each respective exciter unit is fed by a monophase electric current.

13. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein the respective teeth of the two extreme sides of at least one respective yoke are distributed angularly in a regular manner about the axis of rotation and alternately on the two extreme sides.

14. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein the respective teeth of the two extreme sides of at least one respective yoke are oriented face to face.

15. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein an extremity of each respective tooth of a respective yoke does not extend beyond a respective face of the at least two faces of the coil.

16. The electric machine with multiple air gaps and a 3D magnetic flux according to claim 1 , wherein an extremity of each respective tooth of a respective yoke does extend beyond a respective face of the at least two faces of the coil.

17. An electric machine with multiple air gaps and a 3D magnetic flux, including:
an axis of rotation;
a stator equipped with an armature and at least one annular exciter unit that includes a coil, a first annular yoke, and a second annular yoke, with the coil being positioned inside the first and second yokes and having at least two faces, each respective yoke of the first and second yokes including a respective plurality of teeth; and
a rotor revolving around the axis of rotation and equipped with a structure and at least one annular receiver unit, with each respective receiver unit of the at least one receiver unit including a plurality of magnets and cooperating with a single respective exciter unit of the at least one exciter unit, with each magnet having a magnet north pole and a magnet south pole, with one of the magnet north pole and the magnet south pole being located opposite the respective exciter unit and with the other of the magnet north pole and the magnet south pole being located opposite the structure of the rotor, with the total number of magnets being equal to the total number of the teeth;
wherein each respective yoke includes at least two respective extreme sides, the respective plurality of teeth of each respective yoke being distributed angularly along the two respective extreme sides in a regular manner about the axis of rotation, the respective pluralities of teeth of the first and second yokes being fitted into each other on one of the faces while maintaining a distance therebetween, alternately forming tooth north poles and tooth south poles, with each respective receiver unit of the at least one receiver unit including at least two rows of respective magnets of the plurality of magnets, with the at least two rows of magnets of each receiver uni

Assignees

• Airbus Helicopters
• Sintertech
• Mbda France

Inventors

• Mariotto Damien

Classifications

• H02K2201/12

  Transversal flux machines · CPC title

• H02K21/24

  with magnets axially facing the armatures, e.g. hub-type cycle dynamos · CPC title

• H02K21/145

  having an annular armature coil (with homopolar co-operation H02K21/20) · CPC title

• H02K21/22

  with magnets rotating around the armatures, e.g. flywheel magnetos · CPC title

• H02K3/528

  of the claw-pole type · CPC title