Active radial magnetic bearing with yoke winding

Abstract

A radial magnetic bearing includes an axis, a stator, and a rotor. The stator includes at least two stator assemblies axially spaced from one another. Each of the stator assemblies includes a magnetically soft core. At least one of the stator assemblies includes a magnetically soft core with several radially projecting teeth arranged distributed in a circumferential direction, and several coils likewise arranged distributed in the circumferential direction. Two respective teeth of the magnetically soft core that are successive in a circumferential direction are connected to each other by way of a connecting section of the core. A permanent magnet assembly is disposed axially between the two magnetically soft cores. The stator assembly is configured such that one of the respective connecting sections is wound with one of the respective coils. The permanent magnet assembly is part of the rotor.

1 . A radial magnetic bearing comprising:
 an axis, a stator; and   a rotor,   wherein said stator includes at least two stator assemblies axially spaced from one another, where each of said stator assemblies includes a magnetically soft core;   wherein at least one of said stator assemblies includes one said magnetically soft core with several radially projecting teeth arranged distributed in a circumferential direction, and several coils likewise arranged distributed in the circumferential direction, and where two respective teeth of said magnetically soft core that are successive in a circumferential direction are connected to each other by way of a connecting section of said core;   wherein a permanent magnet assembly is disposed axially between said two magnetically soft cores; and   the stator assembly being configured such that one of said respective connecting sections is wound with one of said respective coils wherein said permanent magnet assembly is part of said rotor.   
     
     
         2 . The radial magnetic bearing according to  claim 1 , wherein all of said stator assemblies are embodied such that their magnetically soft core comprises:
 several radially projecting teeth arranged distributed in the circumferential direction, where two respective teeth of said magnetically soft core that are successive in the circumferential direction are connected to each other by way of a connecting section of said core, and where one respective connecting section is wound with one respective coil.   
     
     
         3 . The radial magnetic bearing according to  claim 2 , wherein said rotor comprises:
 an outer hollow cylindrical part and an inner part, where said outer hollow cylindrical part is embodied as a magnetically soft laminated sheet package, and where said inner part of said rotor is embodied as a solid magnetically soft circuit yoke.   
     
     
         4 . The radial magnetic bearing according to  claim 1 , wherein said permanent magnet assembly comprises:
 a continuous axially magnetized permanent magnet.   
     
     
         5 . The radial magnetic bearing according to  claim 1 , wherein each of said magnetically soft cores comprises:
 four or six teeth each.   
     
     
         6 . The radial magnetic bearing according to  claim 1 , wherein more than two stator assemblies are provided, where a permanent magnet assembly is respectively arranged between two axially successive stator assemblies. 
     
     
         7 . The radial magnetic bearing according to  claim 1 , wherein said connecting sections are each configured as a ring segment. 
     
     
         8 . The radial magnetic bearing according to  claim 1 , wherein said connecting sections extend rectilinear and in a tangential direction. 
     
     
         9 . The radial magnetic bearing according to  claim 1 , wherein said teeth project both radially outwardly as well as radially inwardly. 
     
     
         10 . The radial magnetic bearing according to  claim 1 , wherein said permanent magnet assembly is configured with a rare earth magnet. 
     
     
         11 . The radial magnetic bearing according to  claim 1 , wherein said magnetically soft core consists of:
 a laminated sheet package or of magnetically soft composite material.   
     
     
         12 . The radial magnetic bearing according to  claim 1 , wherein said rotor comprises:
 an outer hollow cylindrical part and an inner part, where said outer hollow cylindrical part is embodied as a magnetically soft laminated sheet package, and where said inner part of said rotor is embodied as a solid magnetically soft circuit yoke.   
     
     
         13 . The radial magnetic bearing according to  claim 12 , wherein the permanent magnet assembly has a through-hole through which the outer hollow cylindrical part and the inner part pass. 
     
     
         14 . The radial magnetic bearing according to  claim 12 , wherein the outer hollow cylindrical part and the inner part are each divided by the permanent magnet assembly. 
     
     
         15 . The radial magnetic bearing according to  claim 14 , wherein the permanent magnet assembly is located axially between the two laminated sheet packages of the stator.