Compressor arrangement with integrated motor

Abstract

A rotary compressor arrangement includes a stationary member centered at a shaft axis and a rotary member rotating around the stationary member; the stationary member and the rotary member being inside a hermetically sealed inner volume within the rotary compressor arrangement; the rotary compressor arrangement comprising a stator with a winding arrangement generating an electromagnetic force inside the stator, the stator being arranged outside the hermetically sealed inner volume; the rotary compressor arrangement further comprising a plurality of magnets directly attached to the rotary member and facing the winding arrangement in the stator such that the rotary member is entrained in rotation by a rotating electromagnetic field from the stator.

1 . A rotary compressor arrangement comprising:
 a stationary member centered at a shaft axis and a rotary member rotating around the stationary member;   the stationary member and the rotary member being inside a hermetically sealed inner volume within the rotary compressor arrangement;   a stator with a winding arrangement generating an electromagnetic force inside the stator, the stator being arranged outside of the hermetically sealed inner volume;   a plurality of magnets directly attached to the rotary member and facing the winding arrangement in the stator such that the rotary member is entrained in rotation by a rotating electromagnetic field from the stator;   a rolling member eccentrically arranged with respect to the stationary member such that at least one compression chamber is created between them;   an upper plate and a lower plate arranged at an upper part and a lower part, respectively, of the rolling member, sealing the at least one compression chamber created between the stationary member and the rolling member; and   at least one segment element arranged between the upper and lower plates to allow a tight sealing of the at least one compression chamber and the movement of the rolling member, the at least one segment element comprising a low friction material.   
     
     
         2 . The rotary compressor arrangement according to  claim 1  further comprising:
 at least one satellite element entrained in rotation by the rotary member, the at least one satellite element orbiting at an offset axis and entraining in rotation the rolling member and ensuring a contact between the stationary member and the rolling member. 
 
     
     
         3 . The rotary compressor arrangement according to  claim 2  wherein at least a pair of satellite elements is arranged in height in the rotary member in such a way that the plurality of magnets are located between them. 
     
     
         4 . The rotary compressor arrangement according to  claim 1  wherein the rotary member is configured as a cylinder, the plurality of magnets being directly attached in an external diametric circumference of the rotary member. 
     
     
         5 . The rotary compressor arrangement according to  claim 2  wherein the satellite elements are mounted over bearings. 
     
     
         6 . The rotary compressor arrangement according to  claim 5  wherein the bearings are ball bearings. 
     
     
         7 . The rotary compressor arrangement according to  claim 1  wherein the stator comprises a laminated magnetic core embedded in a resin material, the stator being an integral part of a motor housing. 
     
     
         8 . The rotary compressor arrangement according to  claim 1  wherein a distance separating the winding arrangement and the plurality of magnets is less than around 1 mm. 
     
     
         9 . The rotary compressor arrangement according to  claim 1  further comprising at least one sealing piston slidable within the stationary member during rotation of the rolling member creating the at least one compression chamber whose volume is decreased by rotation of the rolling member so that a compressible fluid is compressed before being discharged. 
     
     
         10 . The rotary compressor arrangement according to  claim 9  wherein the compressible fluid comprises a refrigerant gas. 
     
     
         11 . The rotary compressor arrangement according to  claim 9  wherein a lubricating oil is provided with the compressible fluid. 
     
     
         12 . The rotary compressor arrangement according to  claim 1  wherein the low friction material has a coefficient of friction below 0.4. 
     
     
         13 . A cooling/refrigerating system comprising a rotary compressor arrangement comprising:
 a stationary member centered at a shaft axis and a rotary member rotating around the stationary member;   the stationary member and the rotary member being inside a hermetically sealed inner volume within the rotary compressor arrangement;   a stator with a winding arrangement generating an electromagnetic force inside the stator, the stator being arranged outside of the hermetically sealed inner volume;   a plurality of magnets directly attached to the rotary member and facing the winding arrangement in the stator such that the rotary member is entrained in rotation by a rotating electromagnetic field from the stator;   a rolling member eccentrically arranged with respect to the stationary member such that at least one compression chamber is created between them;   an upper plate and a lower plate arranged at an upper part and a lower part, respectively, of the rolling member, sealing the at least one compression chamber created between the stationary member and the rolling member; and   at least one segment element arranged between the upper and lower plates to allow a tight sealing of the at least one compression chamber and the movement of the rolling member, the at least one segment element comprising a low friction material.