Electric motor rotor and electric motor associated

Patent metadata

Field	Value
Publication number	US-10270302-B2
Application number	US-201615043250-A
Country	US
Kind code	B2
Filing date	Feb 12, 2016
Priority date	Feb 16, 2015
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

An electric motor rotor includes a substantially cylindrical body, which conducts a magnetic field, and defines at least one housing receiving a group of magnets that includes at least two permanent magnets. Two circumferentially adjacent magnets of the housing are separated from one another by an air knife.

First claim

What is claimed is:

1. An electric motor rotor comprising a substantially cylindrical body, which conducts a magnetic field and defines at least one housing receiving a group of magnets comprising at least two permanent magnets,
wherein circumferentially adjacent magnets of the at least two permanent magnets in the housing are separated from one another by an air knife,
the at least one housing comprising a plurality of notches and a plurality of intermediate zones such that the plurality of notches are arranged along a main axis of the housing and separated from one another by one of the plurality of intermediate zones, and
each notch, in a direction perpendicular to the main axis of the housing, faces the respective intermediate zones in the housing.

2. The rotor according to claim 1 , wherein the air knife has a thickness greater than or equal to 0.01 mm.

3. The rotor according to claim 1 , wherein each magnet is inserted into the respective notches by one of its longitudinal ends, and each of the notches are configured such that the at least two permanent magnets circumferentially adjacent in the housing are separated from one another by the air knife when their ends are engaged in their respective notches.

4. The rotor according to claim 3 , wherein the at least two permanent magnets circumferentially adjacent in the housing are radially offset.

5. The rotor according to claim 3 , wherein the adjustment between each notch and the respective permanent magnets is at least a sliding adjustment so as to allow placement, immobilization, and disassembly of the respective permanent magnets by hand, without damaging the respective permanent magnets.

6. The rotor according to claim 5 , wherein each magnet has a unique elementary block shape having a bevel on each of its edges.

7. The rotor according to claim 1 , wherein the periphery of the body is formed by a metal matrix of said body, and each housing extending away from said periphery.

8. The rotor according claim 1 , wherein the main axis of each housing forms a non-zero angle with a radial direction of the body.

9. The rotor according to claim 1 , wherein the substantially cylindrical body defines at least two housings and the at least two housings are arranged circumferentially adjacent and symmetrical in the radial direction of the body so as to form a V-shaped magnetic pole or a substantially planar magnetic pole.

10. The rotor according to claim 9 , wherein the body comprises several poles distributed symmetrically according to a rotational symmetry.

11. The rotor according to claim 9 , wherein the body comprises a substantially planar face extending at the periphery of said body between two circumferentially adjacent poles.

12. The rotor according to claim 1 , wherein it comprises a stack of bodies forming a foliated assembly.

13. An electric motor comprising a rotor according to claim 1 .

Assignees

• Alstom Transp Tech

Inventors

• Randria Andry
• Raguin Bruno

Classifications

• H02K1/2753 Primary

  the rotor consisting of magnets or groups of magnets arranged with alternating polarity · CPC title

• H02K1/2766 Primary

  having a flux concentration effect · CPC title

• H02K2201/06

  Magnetic cores, or permanent magnets characterised by their skew · CPC title

• H02K1/04 Primary

  characterised by the material used for insulating the magnetic circuit or parts thereof · CPC title