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US 6,713,918 B2Granted
Spherical bearing for electrical machines with permanent magnetic rotors
AssigneesOliver Laing, Karsten Laing, Birger Laing
InventorKarsten A. Laing
Life of this patent
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Abstract
In the motor assembly of a pump in which a magnetic rotor is balanced on a spherical bearing projecting into an axial cavity of said rotor assembly, the bearing surface inside the cavity is shaped and dimensioned to stabilize the rotor assembly in the presence of diverging magnetic forces generated by the permanent magnets forming the core of the rotor.
Claims13
A rotating electrical machine which comprise:
- a rotor including a permanent magnet and having an tidal channel;
- a stator including a magnetic yoke end a winding;
- a post having a cap axially engaged into said channel;
- a bearing ball of a given radius, said ball being positioned on said cap;
- a portion of said channel comprising a cylindrical portion transitioning to a hemispherical bearing surface capping said portion, said cylindrical portion and bearing surface having a hemispherical equal to said given radius plus a desired clearance, said cylindrical portion thereby forming side walls in a nest of said axial channel;
- said ball being engaged into said portion and bearing against said hemispherical bearing surface.
3 more elements
In the manufacture of an electric motor including a magnetized rotor surrounded by an annular stator comprising a magnetic yaks and a winding;
- wherein said rotor is balanced on a spherical bearing of a given radius, said bearing including a hemispherical surface positioned at the tip of amounting post engaged into an axial channel in said rotor, an improvement which comprises:
- shaping and dimensioning a bearing surface in a cavity for receiving said tip of said mounting post into a spherical sector and a cylindrical portion having a base radius equal to said given radius plus a desired clearance dimension, said cylindrical portion thereby forming side walls in a part of said axial channel.
Dependencies are inferred from the claim text.