Rotor of an electric motor, with an outer sleeve formed by winding, method for producing such a rotor, and electric motor comprising such a rotor

Patent metadata

Field	Value
Publication number	US-9793771-B2
Application number	US-201314647780-A
Country	US
Kind code	B2
Filing date	Nov 28, 2013
Priority date	Nov 28, 2012
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

An electric motor rotor including a magnetic core, magnets fastened to the periphery of the magnetic core, and a wire wound with touching turns around the magnetic core and the magnets. The wire includes a metal core surrounded by an electrically insulating layer, itself covered by an outer sheath of thermo-adhesive material, the turns being fastened to one another by adhesion between mutually contacting portions of the outer sheath. A method of fabricating such a rotor. An electric motor including such a rotor.

First claim

The invention claimed is:

1. An electric motor rotor comprising a magnetic core, magnets fastened to the periphery of the magnetic core, and a wire wound with touching turns around the magnetic core and the magnets, the rotor being characterized in that the wire comprises a metal core surrounded by an electrically insulating layer, itself covered by an outer sheath of thermo-adhesive material, the turns being fastened to one another by adhesion between mutually contacting portions of the outer sheath, and at least one end of the wire being engaged in at least one orifice formed in the magnetic core, wherein at least one cap is fastened on the magnetic core in order to cover at least one end of the wire and wherein the end of the wire is pressed against a frustoconical portion of the magnetic core and the cap is in the form of a ring having a frustoconical inside surface fastened to the frustoconical portion so as to cover the ends of the wire.

2. The rotor according to claim 1 , wherein the metal core is made of steel.

3. The rotor according to claim 2 , wherein the steel is non-magnetic.

4. An electric motor comprising a stator defining a housing that rotatably receives a rotor in accordance with claim 1 .

5. An electric motor rotor comprising a magnetic core, magnets fastened to the periphery of the magnetic core, and a wire wound with touching turns around the magnetic core and the magnets, the rotor being characterized in that the wire comprises a metal core surrounded by an electrically insulating layer, itself covered by an outer sheath of thermo-adhesive material, the turns being fastened to one another by adhesion between mutually contacting portions of the outer sheath, and at least one end of the wire being engaged in at least one orifice formed in the magnetic core, wherein at least one end of the wire is engaged in a plurality of orifices arranged in the magnetic core.

6. An electric motor comprising a stator defining a housing that rotatably receives a rotor in accordance with claim 5 .

7. The rotor according to claim 5 , wherein the metal core is made of steel.

8. The rotor according to claim 7 , wherein the steel is non-magnetic.

Assignees

• Safran Electronics & Defense

Inventors

• Rabret Bernard
• Andre Bruno
• Princay Gaetan
• Piaton Jerome
• Bessede Thierry

Classifications

• Y10T29/49014

  Superconductor · CPC title

• H02K1/278 Primary

  Surface mounted magnets; Inset magnets · CPC title

• H02K15/03

  having permanent magnets · CPC title

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• H02K1/28 Primary

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title