Compressor and air conditioner having the same

Abstract

A scroll compressor uses fatty-acid ester oil for lubrication when a hydro-fluorocarbon (HFC) based-refrigerant is used, and uses fatty-acid mineral oil when a hydro-chlorofluorocarbon (HCFC)-based refrigerant is used. The driving motor is a synchronous reluctance motor with a rotor comprised of a plurality of flat plates. Each plate has a plurality of magnetic flux barriers that extend in both a circumferential direction and a radius direction. An insulation film formed of a crystalline plastic film is interposed between a coil and a stator of the motor, and the coil is formed of wire with an enamel coating layer. These features result in less deformation of the driving motor. In addition, losses due to slippage at the driving motor are lowered. Further, thermal loss due to emission of the rotor is decreased.

1 . A compressor, comprising:
 a casing having an inner space to which a suction pipe and a discharge pipe are connected;   a compressor device installed in the casing and configured to compress a fluid received through the suction pipe and configured to output the compressed fluid through the discharge pipe;   a driving motor installed in the casing and coupled to the compression device, wherein the driving motor comprises:
 a stator comprising a plurality of stator plates laminated together and configured to be inserted into an inner circumferential surface of the casing, each stator plate having a plurality of protruding poles on which a coil is wound; 
 a rotor comprising a plurality of rotor plates laminated together and configured to be rotatably disposed in the stator, wherein each rotor plate comprises a plurality of magnetic flux barriers formed therein, and wherein a width of each magnetic flux barrier in a radius direction and a separation distance between adjacent magnetic flux barriers in the radius direction both increase towards the center of the driving motor; and 
 a rotation shaft coupled to the center of the rotor and having one end coupled to the compression device. 
   
   
   
       2 . The compressor of  claim 1 , wherein each of the stator plates includes a rotor insertion hole at the center, and a plurality of protruding fixing portions formed on a peripheral portion of the plate, and wherein a ratio of (d 1 /w 1 ) is greater than or equal to 2.1, wherein d 1  is a diameter of the rotor insertion hole, and wherein w 1  is a width of the stator plate in the radial direction from an edge of the rotor insertion hole to an outer edge of one of the protruding fixing portions. 
   
   
       3 . The compressor of  claim 1 , wherein each of the stator plates includes a plurality of protruding fixing portions and a plurality of cut-passages which alternate with one another along an outer peripheral edge of the stator plate, and wherein the protruding fixing portions couple the stator to an inner surface of the casing. 
   
   
       4 . The compressor of  claim 3 , wherein an angle θ formed between ends of a protruding fixing portion and a center of the stator is approximately 15°˜35°. 
   
   
       5 . The compressor of  claim 3 , wherein the cut-passages are formed so that a ratio (QA 0 /QA 1 ) between a sum (QA 0 ) of a circumferential length of all the cut-passages and a sum (QA 1 ) of a circumferential length of all the protruding fixing portions is 0.3˜0.7. 
   
   
       6 . The compressor of  claim 1 , wherein each of the rotor plates is configured such that distances from an outer circumferential surface of the rotor to ends of the magnetic flux barriers is substantially uniform for each of the magnetic flux barriers. 
   
   
       7 . The compressor of  claim 6 , wherein each of the rotor plates is configured such that at least one bridge connects an inner surface and an outer surface of at least one of the magnetic flux barriers. 
   
   
       8 . The compressor of  claim 1 , wherein each of the rotor plates is configured such that distances between ends of the magnetic flux barriers and an outer circumferential surface of the rotor are different for different ones of the magnetic flux barriers. 
   
   
       9 . The compressor of  claim 8 , wherein each of the rotor plates is configured such that at least one bridge connects an inner surface and an outer surface of at least one of the magnetic flux barriers. 
   
   
       10 . The compressor of  claim 1 , wherein an outer diameter of the stator of the driving motor is larger than its height in a shaft direction. 
   
   
       11 . The compressor of  claim 1 , wherein a radius of the stator of the driving motor is smaller than an outer diameter of the rotor. 
   
   
       12 . The compressor of  claim 1 , wherein upper and lower ends of the rotor of the driving motor are supported by upper and lower end plates, respectively, and wherein each of the end plates has a thickness of approximately 1˜4 mm. 
   
   
       13 . The compressor of  claim 12 , wherein a balance weight, eccentric at a certain angle in a circumferential direction, is integrally formed on at least one of the end plates, and wherein a thickness of the balance weight is less than two times the thickness of the end plate to which it is coupled. 
   
   
       14 . The compressor of  claim 12 , wherein either the upper or the lower end plate completely covers the magnetic flux barriers. 
   
   
       15 . The compressor of  claim 12 , wherein either the upper or the lower end plate partially covers the magnetic flux barriers so as to form a path through the rotor in the upper and lower directions. 
   
   
       16 . The compressor of  claim 1 , wherein at least one of the stator plates is formed of steel and has a thickness less than approximately 1/100 of the total height of the stator. 
   
   
       17 . The compressor of  claim 1 , wherein at least one of the rotor plates is formed of steel and has a thickness less than approximately 1/100 of the total height of the rotor. 
   
   
       18 . The compressor of  claim 1 , wherein the coil wound on the poles of the stator has a height that is approximately 1.5˜3 times a height of the laminated stator. 
   
   
       19 . The compressor of  claim 1 , further comprising a Trochoid pump configured to draw oil in from the casing, wherein the Trochoid pump is disposed at a lower end of the rotation shaft. 
   
   
       20 . The compressor of  claim 1 , wherein oil is filled in the casing up to a height lower than a lowest end of the stator. 
   
   
       21 . The compressor of  claim 1 , wherein the rotation shaft has a length that is approximately 2˜6 times a height of the driving motor. 
   
   
       22 . The compressor of  claim 1 , wherein the compressor device comprises a scroll compressor that includes a fixed scroll formed on a lower portion of a plate portion, and an orbiting scroll, wherein the orbiting scroll is coupled to the rotation shaft of the driving motor, and wherein the rotation shaft is formed so that its diameter is ⅙˜¼ times a diameter of the plate portion of the fixed scroll. 
   
   
       23 . The compressor of  claim 1 , wherein the compressor device comprises a scroll compressor that includes a fixed scroll formed on a lower portion of a plate portion, and an orbiting scroll, wherein the orbiting scroll is coupled to the rotation shaft of the driving motor, and wherein the rotor of the driving motor is formed so that a height of the laminated rotor plates is 3˜7 times of a wrap height of the fixed scroll and the orbiting scroll. 
   
   
       24 . The compressor of  claim 1 , wherein the compressor device comprises a scroll compressor that includes a fixed scroll formed on a lower portion of a plate portion, and an orbiting scroll, wherein the orbiting scroll is coupled to the rotation shaft of the driving motor, and wherein the stator is formed so that its outer diameter is larger than an outer diameter of the outermost compression chamber between the fixed scroll and the orbiting scroll. 
   
   
       25 . The compressor of  claim 24 , wherein a stepped portion is formed between the driving motor and the compression device. 
   
   
       26 . The compressor of  claim 1 , wherein a gap of 0.4˜0.8 mm is formed between the stator and the rotor of the driving motor. 
   
   
       27 . The compressor of  claim 1 , wherein the compressor device comprises a scroll compressor that includes a fixed scroll formed on a lower portion of a plate portion, and an orbiting scroll, wherein the orbiting scroll is coupled to the rotation shaft of the driving motor, wherein the fixed scroll and the orbiting scroll are formed by a casting method, and wherein either the fixed scroll or the orbiting scroll is solid-lubrication processed. 
   
   
       28 . The compressor of  claim 1 , wherein the compressor device comprises a scroll compressor that includes a fixed scroll formed on a lower portion of a plate portion, and an orbiting scroll, wherein the orbiting scroll is coupled to the rotation shaft of the driving motor, and wherein the orbiting scroll is formed of a material having a weight less than that of the fixed scroll. 
   
   
       29 . The compressor of  claim 1 , wherein the compressor device comprises a scroll compressor that includes a fixed scroll formed on a lower portion of a plate portion, and an orbiting scroll, wherein the orbiting scroll is coupled to the rotation shaft of the driving motor, and wherein a back pressure chamber for supporting the orbiting scroll by containing oil therein is formed on an upper surface of a main frame located under a lower surface of the orbiting scroll. 
   
   
       30 . The compressor of  claim 1 , wherein a height difference between a center of the rotor and a center of the stator is within the range of approximately 2˜3 mm. 
   
   
       31 . The compressor of  claim 1 , wherein the rotation shaft is coupled to the rotor by a shrinkage fit. 
   
   
       32 . The compressor of  claim 1 , wherein the driving motor is synchronously rotated by a reluctance torque in a direction such that magnetic resistance is minimized. 
   
   
       33 . The compressor of  claim 1 , wherein when a hydro-fluorocarbon (HFC) based-refrigerant is used, fatty-acid ester oil is used for lubrication, and when a hydro-chlorofluorocarbon (HCFC)-based refrigerant is used, fatty-acid mineral oil is used for lubrication. 
   
   
       34 . The scroll compressor of  claim 33 , wherein the fatty-acid ester oil has a viscosity of 2˜70 cSt at a temperature of 40° C. and a viscosity of 1˜9 cSt at a temperature of 100° C. and is ester-coupled in a molecule at least two times, and the fatty-acid mineral oil has a viscosity of 32˜68 cSt at a temperature of 40° C. and is ester-coupled in a molecule at least two times. 
   
   
       35 . The compressor of  claim 1 , wherein the magnetic flux barriers are formed to penetrate the rotor in a shaft direction. 
   
   
       36 . The compressor of  claim 1 , wherein an insulation film formed of a crystalline plastic film having a separation transition temperature of more than approximately 50° C. is interposed between the coil and the stator. 
   
   
       37 . The compressor of  claim 1 , wherein the coil comprises an enamel coating layer having a separation transition temperature greater than approximately 120° C. 
   
   
       38 . The compressor of  claim 3 , wherein each of the protruding fixing portions and each of the cut-passages are respectively formed so as to have the same shape and area with the same interval. 
   
   
       39 . An air conditioner comprising the compressor of  claim 1 . 
   
   
       40 . A compressor, comprising:
 a casing having an inner space to which a suction pipe and a discharge pipe are connected;   a compressor device installed in the casing;   a driving motor installed in the casing and coupled to the compressor device, wherein the driving motor comprises:
 a stator comprising a plurality of stator plates laminated together and configured to be inserted into an inner circumferential surface of the casing, each stator plate having a plurality of protruding poles on which a coil is wound; 
 a rotor comprising a plurality of rotor plates laminated together and configured to be rotatably disposed in the stator, wherein each rotor plate comprises a plurality of magnetic flux barriers formed therein, wherein at least one bridge connects an inner surface and an outer surface of at least one of the magnetic flux barriers; and 
 a rotation shaft coupled to the center of the rotor and having one end coupled to the compression device. 
   
   
   
       41 . The compressor of  claim 40 , wherein a width of each magnetic flux barrier in a radius direction and a separation distance between adjacent magnetic flux barriers in the radius direction each increase towards the center of the driving motor. 
   
   
       42 . A compressor, comprising:
 a casing having an inner space to which a suction pipe and a discharge pipe are connected;   a compressor device installed in the casing;   a driving motor installed in the casing and coupled to the compressor device, wherein the driving motor comprises:
 a stator comprising a plurality of stator plates laminated together and configured to be inserted into an inner circumferential surface of the casing, each stator plate having a plurality of protruding poles on which a coil is wound; 
 a rotor comprising a plurality of rotor plates laminated together and configured to be rotatably disposed in the stator, wherein each rotor plate comprises a plurality of magnetic flux barriers formed therein, and wherein distances between ends of the magnetic flux barriers and an outer circumferential surface of the rotor plate are different for different ones of the magnetic flux barriers; and 
   a rotation shaft coupled to the center of the rotor by shrinkage fit and having one end coupled to the compression device.   
   
   
       43 . The compressor of  claim 42 , wherein a width of each magnetic flux barrier in a radius direction and a width between adjacent magnetic flux barriers in the radius direction each increase towards the center of the driving motor. 
   
   
       44 . The compressor of  claim 43 , wherein at least one bridge connects an inner surface and an outer surface of at least one of the magnetic flux barriers. 
   
   
       45 . The compressor of  claim 42 , wherein at least one bridge connects an inner surface and an outer surface of at least one of the magnetic flux barriers.