JP2010246229A - Compressor with synchronous motor mounted, and method of manufacturing synchronous motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve highly efficient utilization of resources while overcoming noises and characteristic deterioration caused by the reduction in rigidity of the permanent magnet insertion part of a compressor with a synchronous motor mounted thereon. <P>SOLUTION: A core 168 is fixed to a shaft 110 as a compression element 103. A plurality of secondary conductors 171 are arranged near the outer circumference of a rotor 155, and permanent magnets 170a are arranged on the outer circumferential side rather than the inner circumferential surface 190 of an end ring 172 positioned on the outer circumference of the rotor 155. Thereby, a highly efficient synchronous motor mounted compressor is obtained wherein the rigidity deterioration of the core 168, noises and characteristic deterioration are eliminated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a compressor equipped with a synchronous motor that compresses a gas such as a refrigerant with a compressor, and a method of manufacturing a synchronous motor mounted on the compressor.

  From the viewpoint of protecting the global environment in recent years, more efficient compressors are required, and motor efficiency is indispensable as a means of increasing efficiency. The synchronous motor is an effective means for achieving high efficiency, and in order to achieve a structure and structure with higher efficiency, low noise, high durability, and high productivity in a configuration in which synchronous operation is performed using a permanent magnet. As a result of development, high-efficiency products suitable for the global environment have been developed from the viewpoint of resources using materials that are highly productive, inexpensive, and easily available. However, products suitable for the global environment are desired.

  As a conventional compressor equipped with a synchronous motor, a compression element and a synchronous motor are housed in a container. The synchronous motor is a self-starting permanent magnet type, and the synchronous motor is compressed by the compression element by the rotation of the rotor connected to the shaft. An on-board compressor is disclosed (for example, see Patent Document 1).

  Moreover, as a structure of a synchronous motor, the synchronous motor provided with the rotor which has a permanent magnet, the laminated iron core which has a cage conductor in a peripheral part, and the hole hold | maintained at a shaft is disclosed (for example, refer patent document 2). .

  The conventional synchronous motor-equipped compressor and synchronous motor will be described below with reference to the drawings.

  FIG. 11 is a longitudinal sectional view of a conventional compressor equipped with a synchronous motor, and FIG. 12 is a horizontal sectional view of the conventional synchronous motor.

  In FIG. 11, the compressor 50 includes a compression element 52 provided in the container 51 and a self-starting permanent magnet type synchronous motor 53 provided above the compression element 52 in a container 51. The shaft 54 is an axis attached to the rotor 55 of the synchronous motor 53 and includes an eccentric portion 56.

  The compression element 52 includes a bearing portion 57 made of aluminum die-casting or cast iron into which the shaft 54 is inserted, and a cylinder block 60 made of an iron-based material casting provided with a cylinder 59 on which the piston 58 slides. A compression chamber 62 is formed in the cylinder 59 by being connected to the eccentric portion 56 by a connecting rod 61.

  The bearing portion 57 and the cylinder block 60 are attached with bolts B. A cylinder head 63 having a discharge valve and a suction valve (both not shown) is attached to the tip of the cylinder 59.

  A suction muffler 64 is attached to the suction valve side of the cylinder head 63. An oil supply pipe 65 is attached to the tip of the eccentric part 56, and the lubricating oil 66 stored in the bottom part of the container 51 is guided to the sliding part of the compression element 52 for lubrication.

The synchronous motor 53 includes a stator 67 in which a winding is wound around a fixed iron core made of a laminated electromagnetic steel sheet having a thickness L1, and a rotor 55 made up of a core portion 68 made of the laminated electromagnetic steel sheet. A bore portion 69 is formed on the compression element 52 side of the rotor 55, and a part of the bearing portion 57 extends into the bore portion 69.

  The permanent magnet 70a is a permanent magnet 70a made of two flat-plate rare earth magnets, such as neodymium, iron, and boron-based ferromagnets, so that the permanent magnet 70a of the same polarity is butted in a mountain shape having a butting angle. The rotor portion is inserted and embedded in the axial direction of the core portion 68, and one permanent rotor magnetic pole is formed by the two permanent magnets 70 a, and the rotor 55 as a whole forms a two-pole rotor magnetic pole.

  Here, in the method of manufacturing the rotor 55 of the synchronous motor 53, the magnet housing part 70b is used for short-circuiting both ends of the secondary conductor 71 forming the cage shape of the rotor 55 so that the permanent magnet 70a can be inserted. The permanent magnet 70a is inserted after the secondary conductor 71 and the end ring 72 are formed by die-casting with aluminum or the like.

  Here, although the permanent magnet 70a is magnetized, it may be magnetized before or after insertion into the core portion 68.

  In addition, although two permanent magnets 70a having the same polarity are arranged in a mountain shape to form a single-pole rotor magnetic pole, even if a single-pole rotor magnetic pole is formed from a single arcuate permanent magnet 70a. Good.

  Then, a large number of secondary conductors 71 provided in the core portion 68 and end rings 72 positioned at both ends in the axial direction of the core portion 68 are integrally molded by aluminum die casting to form a starting cage conductor. . A protective end plate 73 is provided to prevent the permanent magnet 70a from falling off.

  In FIG. 12, the synchronous motor 53 forms magnetic poles using two arcuate permanent magnets 70a. The permanent magnet 70 a is housed in a magnet housing portion 70 b formed around the shaft hole 54 a of the core portion 68.

  The secondary conductor 71 is formed by a method such as aluminum die casting inside the slot 71 a on the outer peripheral portion of the core portion 68.

  The interval between the secondary conductors 71 is T1, and the radial depth is H1. In addition, a gap 80 is formed between the magnetic poles of the permanent magnet 70a, and the magnet housing portion 70b has a configuration in which the core portion 68 is connected at an interval P.

  The operation of the conventional synchronous motor-equipped compressor having the above configuration will be described below.

  When the compressor 50 starts operation, the compression element 52 starts to compress the refrigerant or the like by the rotation of the rotor 55 of the synchronous motor 53. The refrigerant or the like is sucked into the container 51, enters the cylinder 59 through the suction muffler 64, is compressed in the compression chamber 62 by the piston 58, and is sent from the cylinder head 63 to the refrigeration system outside the container 51. The

Lubricating oil 66 is supplied between the piston 58 and the cylinder 59, between the connecting rod 61 and the shaft 54, and between the sliding parts such as the bearing part 57, and lubricates between the sliding members of the sliding parts.
JP 2001-73948 A Japanese Patent Publication No.59-23179

  However, in the above-described conventional configuration, if there is the shaft hole 54a at the center of the core portion 68 and the magnet storage portion 70b for inserting the permanent magnet 70a between the end rings 72, the rigidity of the core portion 68 as a whole is weakened. In particular, when the magnet housing part 70b is located near the shaft hole 54a, the holding force for holding the rotor 55 on the shaft 54 is weakened, and the laminated steel sheet is displaced during transportation. However, there is a problem that the efficiency and startability are deteriorated, or noise generated between the laminated portions of the core portion 68 occurs due to a decrease in rigidity.

  Further, the permanent magnet 70a is more easily provided with a magnetic force when arranged on the outer peripheral side, but has an end ring 72, and a magnet storage portion 70b for inserting the permanent magnet 70a is formed so as to overlap the end ring 72. Therefore, as in the conventional example, a rare earth strong magnet such as neodymium must be formed on the center side of the core portion 68, and a magnet such as a ferrite having a weak magnetic force cannot be used. Was.

  In addition, the permanent magnet 70a is stronger at the center side of the magnetic poles, and slightly weaker between the magnetic poles can improve efficiency without causing interference between the magnetic poles. However, in the arrangement as in the conventional example, the circumferential direction of the magnetic poles There was a problem that it was not possible to optimize the strength balance.

  Furthermore, it is desirable that the permanent magnet 70a is in the vicinity of the outer periphery of the rotor 55, and the secondary conductor 71 used from the start to the synchronous rotation is also provided on the outer periphery of the core portion 68 of the rotor 55. A configuration and a manufacturing method with the end ring 72 have not been proposed, and a sufficient cross-sectional area and arrangement of the secondary conductor 71 can be secured on the outer peripheral side, and the permanent magnet 70a can be similarly arranged on the outer peripheral side. I had a problem that I couldn't.

  As a result, synchronous motor-equipped compressors have not been fully established in consideration of the global environment, including high efficiency, high durability, low noise, environmental adaptation through the use of inexpensive materials, and improved productivity. It was.

  The present invention solves the above-described conventional problems, and is equipped with a synchronous motor that takes into consideration the global environment, such as high efficiency, high durability, low noise, environmental adaptation by using inexpensive materials, and improvement of productivity. The purpose is to propose a compressor and a method for manufacturing a synchronous motor capable of achieving it.

  In order to solve the above-described conventional problems, a synchronous motor-equipped compressor and a synchronous motor manufacturing method according to the present invention include a compression element and a synchronous motor housed in a container, and the rotor of the synchronous motor has a core portion. And an end ring that short-circuits the secondary conductor and the secondary conductor at the top and bottom of the rotor, a plurality of magnet storage portions, and a plurality of permanent magnets, and the core portion is fixed to a shaft that is an element of the compression element. Yes.

  A plurality of secondary conductors are arranged in the vicinity of the outer periphery of the rotor, and the permanent magnet is arranged on the outer peripheral side from the inner peripheral surface of the end ring of the secondary conductor located on the outer peripheral portion of the rotor. In the method, the secondary conductor and the first end ring are formed by die casting of molten metal, and at the formation stage, the secondary conductor has a protrusion on the opposite side of the first end ring, and the permanent magnet After the magnet is housed in the magnet housing portion, the second end ring is formed while being melted and integrated with the protrusion.

This makes it possible to construct a permanent magnet with high productivity and high efficiency without lowering the rigidity of the core part. Highly efficient, highly durable, low noise, and environmental adaptation and production by using inexpensive materials. This makes it possible to manufacture compressors equipped with synchronous motors that take the global environment into consideration, such as improved performance, and synchronous motors.

  The compressor mounted with a synchronous motor and the method for manufacturing the synchronous motor according to the present invention enables a highly efficient and highly durable permanent magnet configuration without reducing the rigidity of the core, and with high efficiency and high durability. This makes it possible to manufacture compressors equipped with synchronous motors and synchronous motors that are friendly to the global environment, such as low noise, environmental adaptation by using inexpensive materials, and improved productivity.

  According to the first aspect of the present invention, the compression element and the synchronous motor are housed in the container, and the rotor of the synchronous motor is an end ring that short-circuits the core portion, the secondary conductor, and the secondary conductor above and below the rotor. And a magnet housing portion and a permanent magnet, the core portion is fixed to a shaft that is an element of the compression element, the secondary conductor is arranged near the outer periphery of the rotor, and the permanent magnet is It is arranged on the outer peripheral side of the inner peripheral surface of the end ring of the secondary conductor located on the outer peripheral part of the rotor, and thereby the magnet housing part of the core part into which the permanent magnet is inserted However, the shaft is not in the vicinity of being fixed by press-fitting or shrink fitting, and is not in a position to weaken the rigidity of the core. Transportation or the like, does not cause characteristic degradation due to the rotor or deformed. Furthermore, since the generation of resonance vibration and noise due to the reduction in the rigidity of the rotor around the shaft is suppressed, a low noise synchronous motor mounted compressor can be provided.

  In addition, since resonance vibration and noise generation due to a decrease in rigidity of the core itself are suppressed, a low-noise synchronous motor-equipped compressor can be provided.

  In addition, since the permanent magnet is arranged on the outer peripheral side from the inner peripheral surface of the end ring, which is a highly rigid part, the rigidity of the end ring eliminates the problem of rigidity as described above, and is highly efficient and durable. It will be possible to achieve a compressor equipped with a synchronous motor that is excellent in performance and does not generate noise.

  According to a second aspect of the present invention, in the first aspect of the invention, the secondary conductor has a portion that is long in the radial direction and a flat conductor portion that is long and flat in the circumferential direction. The permanent magnet is arranged on the peripheral side, and thereby the permanent magnet can be arranged at a position close to the outer peripheral surface of the rotor while sufficiently securing the cross-sectional area of the secondary conductor. In addition to the effect, a sufficient magnetic field can be secured even by using a permanent magnet having a relatively low magnetic force.

  In addition to securing a sufficient magnetic field, the sufficient cross section of the secondary conductor can be secured to cope with secondary current loss and overload current at start-up. Ensuring sufficient magnetic field efficiency and secondary current It is possible to achieve both suppression of increase in resistance.

  The invention according to claim 3 is the invention according to claim 1, in which a permanent magnet is disposed between two adjacent secondary conductors, whereby the permanent magnet is disposed between the secondary conductors. Therefore, since the permanent magnet can be arranged at a position close to the surface of the rotor and the secondary conductor can also be arranged at a position close to the surface, in addition to the effect of the invention according to claim 1, secondary current loss, It is possible to cope with an overload current at the time of starting, and it is possible to achieve both ensuring of efficiency by a sufficient magnetic field and suppression of increase in secondary current resistance.

In addition, since the permanent magnet can be arranged at a position close to the surface, it is possible to use, for example, a ferrite-based permanent magnet without using a valuable and expensive material made of rare earths as in the conventional permanent magnet. From the viewpoint of resources, it is possible to achieve an environmentally friendly compressor equipped with a synchronous motor.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the core portion has a slit which is a magnet housing portion between adjacent secondary conductors on the outer periphery, The permanent magnet is inserted and arranged in the slit, whereby the permanent magnet is arranged between the secondary conductors, so that the permanent magnet can be arranged at a position close to the surface of the rotor, and 2 Since the secondary conductor can also be arranged at a position close to the surface, in addition to the effect of the invention according to any one of claims 1 to 3, it can further cope with secondary current loss and overload current at start-up, It is possible to achieve both ensuring of efficiency by a sufficient magnetic field and suppressing increase in secondary current resistance, and productivity is good by inserting the slit into the slit.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the slit is formed on the outer surface of the rotor, whereby a permanent magnet is disposed between the secondary conductors. In addition to the effects of the invention according to claim 4, in addition to the effects of the invention according to claim 4, secondary current loss and at the time of starting can be arranged. It can cope with overload current, and it is possible to achieve both of ensuring efficiency by a sufficient magnetic field and suppressing increase in secondary current resistance, and even after forming the rotor end ring first, the outer circumference of the rotor From the surface, it becomes possible to insert a permanent magnet, and the productivity is greatly improved.

  Further, magnetized magnets can be inserted and set even in the final stage of rotor production, and productivity is improved.

  The invention according to claim 6 is the invention according to any one of claims 2 to 4, wherein the permanent magnet is a permanent magnet having a large side near the center of the magnetic pole or a large magnetic force. Accordingly, the magnetic force in the center portion of the magnetic poles can be increased, the magnetic force in the region where the opposite magnetic poles interfere with each other can be reduced, and the magnetic field can be easily optimized. In addition to the effect of the invention described in the above item 1, it is possible to easily achieve both high productivity and high efficiency.

  Moreover, as the method, adjustment with the magnitude | size of the magnetic force in changing the kind of intensity | strength of a permanent magnet or changing the size of a magnet is possible, and is easy.

  According to a seventh aspect of the present invention, the rotor of the synchronous motor has a core portion, a secondary conductor, a magnet storage portion, and a permanent magnet, and the secondary conductor is connected by upper and lower first and second end rings. The secondary conductor and the first end ring are formed by molten metal die casting, and at the formation stage, the secondary conductor and the first end ring have a protrusion of the secondary conductor on the opposite side of the first end ring. The method for manufacturing a synchronous motor is characterized in that after the permanent magnet is housed in the magnet housing portion, the second end ring is formed while being melted and integrated with the projecting portion. If permanent magnets are magnetized and both sides of the first and second end rings and the secondary conductor are integrally die-cast, there is a problem that the magnetic force decreases, but the first end ring and the secondary conductor Is a big cast After that, the permanent magnet is inserted, and then only the second end ring part is melted and die-cast together with the protrusion, so the influence of the heat of fusion does not reach the permanent magnet, and the permanent magnet is magnetized. In this case, the permanent magnet is not thermally deteriorated and the characteristics of the permanent magnet can be maintained even when the magnet is inserted without being magnetized, so that a highly efficient and highly productive manufacturing method can be obtained.

  In addition, this manufacturing method can be applied to all synchronous motors in which the permanent magnet is disposed within the projected area of the end ring, and is highly versatile.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a synchronous motor-equipped compressor according to Embodiment 1 of the present invention, FIG. 2 is a horizontal sectional view of a rotor of the synchronous motor-equipped compressor according to the same embodiment, and FIG. It is another horizontal sectional view of the rotor in a form. FIG. 4 is another horizontal sectional view of the rotor in the same embodiment.

  Hereinafter, the first embodiment of the present invention will be described with reference to FIGS.

  1 to 4, a compressor 101 houses a compression element 103 and a synchronous motor 104 inside a container 102, and a lubricating oil 105 is stored at the bottom of the container 102.

  The shaft 110 has a main shaft portion 111 and an eccentric portion 112 formed eccentrically at one end thereof so as to be integrated with the main shaft portion 111. The lubricating oil 105 is supplied to each sliding part through the oil supply passage 113.

  The compression element 103 includes a cylinder block 120 in which a cylinder 124 and the like that form a compression chamber 130 are formed together with a bearing 121 and a piston 125 that support the shaft 110, and the eccentric portion 112 of the shaft 110 and the piston 125 are By being connected by the connecting rod 122, the rotation of the shaft 110 is converted into the reciprocating motion of the piston 125, and suction and compression operations are performed by changing the volume of the compression chamber 130 of the cylinder 124.

  The gas 131 in the container is sucked into the compression chamber 130 from the suction muffler 131a, compressed, and then discharged from the discharge pipe 135 from the cylinder head 133. Discharge and suction are performed by opening and closing valves, but the details are not shown.

  Next, details of the synchronous motor 104 will be described.

  The rotor 155 is fixed to the shaft 110 through a shaft hole 154a. The rotor 155 has a core portion 168 and a secondary conductor 171 made of an aluminum alloy or the like, and the secondary conductor 171 forms a squirrel-cage motor whose both ends are short-circuited by an end ring 172. The stator 167 is formed by winding a laminated electromagnetic steel sheet and a coil such as copper or aluminum, and generates a rotating magnetic field by energization.

  Furthermore, the core portion 168 has a magnet housing portion 170b, and a permanent magnet 170a is contained therein, and is a synchronous motor having a permanent magnet 170a and a starting cage conductor of the secondary conductor 171.

  Further, the end ring 172 has a radial size determined by the inner peripheral surface 190.

  Furthermore, the secondary conductor 171 has a flat conductor portion 191 due to its shape. In addition, the permanent magnet 192 is made of a magnet having a large magnet thickness and size near the center of the magnetic pole to increase the magnetic field, or use the permanent magnet 170a having a strong magnetic field strength. The permanent magnet 192 is used.

  The operation and action of the synchronous motor-equipped compressor and the synchronous motor configured as described above will be described below.

  When the synchronous motor 104 of the compressor 101 is energized, first, a rotating magnetic field is generated by the secondary current flowing through the secondary conductor 171 and starts rotating, depending on the energized power supply frequency and the number of poles of the magnetic poles. Finally, the operation is shifted to the synchronous operation by the permanent magnet 170a.

  In the synchronous motor-equipped compressor 101 of the present invention, as in the conventional example, the magnet housing portion 170b is not provided in the vicinity of the shaft hole 154a of the core portion 168 or in the portion between the rigid end ring 172 and the magnet. Since a plurality of storage portions 170b are arranged on the outer peripheral side from the inner peripheral surface 190 of the end ring 172, the rigidity of the core portion 168 for inserting and storing the permanent magnet 170a is not weakened. There is no problem that deformation is caused by press-fitting or shrink-fitting between 110 and the shaft hole 154a of the core portion 168, or conversely, due to the deformation, the pressure input is reduced and the rotor 155 is displaced during transportation.

  According to the configuration of the present invention, when the shift occurs, the magnetic center shifts to generate noise, or the core portion 168 has a weak noise due to weakness.

  That is, the cause of the conventional noise generation is the electromagnetic laminated steel sheet of about 0.3 to 1 mm that forms the core portion 168 of the rotor 155. If the rigidity of the core portion 168 is weak, they resonate slightly. It is because it occurs by doing.

  According to the configuration of the present invention, all of the magnet storage portions 170b are located on the outer peripheral side of the inner peripheral surface 190 of the end ring 172. Therefore, the magnet is provided in a portion where the rigidity of the end ring 172 is sufficiently secured over the entire circumference. Since the storage portion 170b can be positioned, the conventional noise problem described above does not occur.

  Further, since the permanent magnet 170a is closer to the outer periphery, it is easier to obtain a strong magnetic field, so that it is close to the magnetic field generated by the stator 167, and even a magnet having a relatively weak magnetic force can obtain a strong magnetic field and maintain high efficiency. It becomes possible to do.

  Conventionally, in general, an example in which a rare earth permanent magnet is used in order to obtain high efficiency is disclosed. However, for example, an iron (ferrite) magnet can obtain sufficient efficiency by using the configuration of the present invention. This makes it possible to avoid the use of precious and expensive resources and materials, and is environmentally friendly in terms of efficiency and resources and materials.

  Furthermore, as shown in FIG. 3, the secondary conductor 171 has a portion that is long in the radial direction and a flat conductor portion 191 that is long and flat in the circumferential direction. A permanent magnet 170 a is provided on the inner peripheral side of the flat conductor portion 191. By adopting the arrangement, the cross-sectional area of the secondary conductor 171 can be sufficiently secured, and the permanent magnet 170a can be arranged at a position close to the outer peripheral surface, so that a sufficient magnetic field can be secured. It becomes easy to obtain, and sufficient cross section of the secondary conductor 171 can be secured together with securing a sufficient magnetic field, so that secondary current loss and overload current at start-up can be dealt with, ensuring sufficient efficiency by the magnetic field, It becomes possible to achieve both suppression of increase in secondary current resistance.

  Furthermore, by disposing the permanent magnet 170a between the two adjacent secondary conductors 171, it is possible to improve both the starting characteristics by the secondary conductor 171 and to secure the magnetic force by the permanent magnet 170a during the synchronous operation. In addition, it is possible to cope with secondary current loss and overload current at start-up, and it is possible to achieve both ensuring of efficiency by a sufficient magnetic field and suppression of increase in secondary current resistance.

Further, since the permanent magnet 170a can be disposed at a position close to the surface, it is possible to use, for example, a ferrite-based permanent magnet for the permanent magnet 170a without using a rare and rare material made of rare earth as in the prior art. Yes, from the viewpoint of resources, it is possible to achieve a compressor equipped with an environmentally friendly synchronous motor.

  Furthermore, although Embodiment 1 of the present invention has been described using a two-pole synchronous motor, the magnetic pole is divided into an N-pole side and an S-pole side, and the direction of the pole of the permanent magnet 170a is a circle. Inverted from the center. At this time, by using the ferromagnetic permanent magnet 192 on the side close to the center of the magnetic pole, that is, on the center side of the semicircular pole, a relatively weaker permanent magnet 170a is arranged at the boundary between the opposing magnetic poles. In the opposite magnetic pole portions, it is possible to reduce the mutual interference and obtain a configuration in which a stronger magnetic field can be obtained at the center of the magnetic poles, so that higher efficiency can be achieved.

  In the first embodiment of the present invention, a two-pole synchronous motor is described, but the same effect can be obtained even if the number of poles is further increased.

  Further, according to the inventor's study, by using the synchronous motor of the present invention, even when a magnet is used that is cheaper than a conventional rare earth magnet, the efficiency higher than that of the conventional magnet can be ensured. Since the rigidity of 155 has been improved, it has been confirmed that noise caused by the rotor 155 can also be reduced.

(Embodiment 2)
FIG. 5 is a longitudinal sectional view of the synchronous motor-equipped compressor in the second embodiment of the present invention, FIG. 6 is a horizontal sectional view of the rotor of the synchronous motor-equipped compressor in the same embodiment, and FIG. It is a permanent magnet insertion figure.

  The second embodiment of the present invention will be described below with reference to FIGS.

  5 to 7, the compressor 201 houses a compression element 203 and a synchronous motor 204 inside a container 202, and a lubricating oil 205 is stored at the bottom of the container 202.

  The shaft 210 has a main shaft portion 211 and an eccentric portion 212 formed eccentrically at one end thereof so as to be integrated with the main shaft portion 211. The lubricating oil 205 is supplied to each sliding part through the oil supply passage 213.

  The compression element 203 includes a cylinder block 220 in which a cylinder 224 that forms a compression chamber 230 is formed together with a bearing portion 221 that supports the shaft 210 and a piston 225, and the eccentric portion 212 of the shaft 210 and the piston 225 are By being connected by the connecting rod 222, the rotation of the shaft 210 is converted into the reciprocating motion of the piston 225, and suction and compression operations are performed by changing the volume of the compression chamber 230 of the cylinder 224.

  The gas 231 in the container is sucked into the compression chamber 230 from the suction muffler 231a, compressed, and then discharged from the discharge pipe 235 from the cylinder head 233. Discharge and suction are performed by opening and closing valves, but the details are not shown.

  Next, details of the synchronous motor 204 will be described.

The rotor 255 is fixed to the shaft 210 through a shaft hole 254a. The rotor 255 has a core portion 268 and a secondary conductor 271 made of an aluminum alloy or the like, and the secondary conductor 271 forms a squirrel-cage motor whose both ends are short-circuited by an end ring 272. The stator 267 is formed by winding a laminated electromagnetic steel sheet and a coil such as copper or aluminum, and generates a rotating magnetic field by energization.

  Furthermore, the core portion 268 has a magnet housing portion 270b, and a permanent magnet 270a is contained therein, and is a synchronous motor having a permanent magnet 270a and a secondary conductor 271 and a starting cage conductor. The magnet storage portion 270 b is a slit 295 formed on the outer peripheral surface of the rotor 255, and the permanent magnet 270 a can be inserted from the outer peripheral surface of the rotor 255.

  Further, the end ring 272 has a radial size determined by the inner peripheral surface 290.

  In addition, the permanent magnet 270a may be a permanent magnet 270a having a strong magnetic field strength in a portion close to the center of the magnetic pole.

  The operation and action of the synchronous motor-equipped compressor and the synchronous motor configured as described above will be described below.

  When the synchronous motor 204 of the compressor 201 is energized, first, a rotating magnetic field is generated by the secondary current flowing in the secondary conductor 271, starts rotating, and depends on the energized power supply frequency and the number of poles of the magnetic poles. Finally, the operation is shifted to the synchronous operation by the permanent magnet 270a.

  In the synchronous motor-equipped compressor 201 of the present invention, as in the conventional example, there is no magnet storage portion 270b in the vicinity of the shaft hole 254a of the core portion 268 or in the portion between the rigid end ring 272 and the magnet. The plurality of storage portions 270b are arranged in the slits 295 formed on the outer peripheral side of the end ring 272, and further on the outermost peripheral side, so that the permanent magnet 270a is inserted and stored. It does not weaken the rigidity of the core part 268. In particular, the core part 268 is deformed by press-fitting or shrink-fitting between the shaft 210 and the shaft hole 254a of the core part 268. In addition, there is no problem that the rotor 255 is displaced.

  According to the configuration of the present invention, when the shift occurs, the magnetic center shifts to generate noise, and the core portion 268 weakens to generate noise.

  That is, the cause of the conventional noise generation is the electromagnetic laminated steel sheet of about 0.3 to 1 mm that forms the core portion 268 of the rotor 255. If the rigidity of the core portion 268 is weak, they resonate slightly. It is because it occurs by doing.

  According to the configuration of the present invention, all the magnet storage portions 270b are located on the outer peripheral side of the inner peripheral surface 290 of the end ring 272, and further on the outermost peripheral surface. The magnet storage portion 270b can be positioned in a portion where sufficient rigidity is ensured, and the conventional noise problem described above does not occur.

  Furthermore, since the permanent magnet 270a is closer to the outer periphery, it is easier to obtain a strong magnetic field. Therefore, the permanent magnet 270a is closer to the magnetic field generated by the stator 267. It becomes possible to do.

  Conventionally, in general, an example in which a rare earth permanent magnet is used in order to obtain high efficiency is disclosed. However, for example, an iron (ferrite) magnet can obtain sufficient efficiency by using the configuration of the present invention. This makes it possible to avoid the use of precious and expensive resources and materials, and is environmentally friendly in terms of efficiency and resources and materials.

  Further, as shown in FIG. 7, the permanent magnet 270 a can be inserted into the slit 295 formed on the outermost periphery of the core portion 268, so that the secondary conductor 271 and the end ring 272 are formed when the rotor 255 is formed. First, the permanent magnet 270a can be inserted after being magnetized after being molded by die casting, casting or the like, or without being magnetized, and the productivity becomes extremely high.

  In addition, the permanent magnet 270a can be inserted after the secondary conductor 271 and the end ring 272 are first formed by die casting, casting, or the like, because high heat is transferred to the permanent magnet 270a during die casting or casting. This means that the permanent magnet 270a does not deteriorate in characteristics, and is a structure that can provide a means that has good productivity and no characteristic deterioration as a manufacturing method.

  Furthermore, by disposing the permanent magnet 270a between the two adjacent secondary conductors 271, it is possible to improve both the starting characteristics by the secondary conductor 271 and ensure the magnetic force by the permanent magnet 270a during the synchronous operation. In addition, it is possible to cope with secondary current loss and overload current at start-up, and it is possible to achieve both ensuring of efficiency by a sufficient magnetic field and suppression of increase in secondary current resistance.

  Further, since the permanent magnet 270a can be disposed at a position close to the surface, it is possible to use, for example, a ferrite-based permanent magnet for the permanent magnet 270a without using a rare earth-based precious and expensive material. Yes, from the viewpoint of resources, it is possible to achieve a compressor equipped with an environmentally friendly synchronous motor.

  Furthermore, although Embodiment 2 of the present invention has been described using a two-pole synchronous motor, the magnetic pole is divided into an N-pole side and an S-pole side, and the direction of the pole of the permanent magnet 270a is a circle. Inverted from the center. At this time, a permanent magnet 270a having a relatively strong magnetic force is used on the side closer to the center of the magnetic pole, that is, on the center side of the semicircular pole, and a weaker permanent magnet 270a is arranged at the boundary between the opposing magnetic poles. By doing so, it is possible to reduce the mutual interference at the opposite magnetic pole portions and obtain a stronger magnetic field at the center of the magnetic poles, so that higher efficiency can be achieved.

  Although the two-pole synchronous motor is described in the second embodiment of the present invention, the same effect can be obtained even if the number of songs is further increased.

  Further, according to the inventor's study, by using the synchronous motor of the present invention, even when a magnet is used that is cheaper than a conventional rare earth magnet, the efficiency higher than that of the conventional magnet can be ensured. Since the rigidity of 255 has been improved, it has been confirmed that noise caused by the rotor 255 can also be reduced.

(Embodiment 3)
8 is a longitudinal sectional view of the synchronous motor according to Embodiment 3 of the present invention, FIG. 9 is a longitudinal sectional view of the rotor in FIG. 8, and FIG. 10 is a manufacturing method of the rotor in FIG. 9 before the second end ring molding. FIG.

  Hereinafter, Embodiment 3 of the present invention will be described with reference to FIGS.

  8 to 10, the synchronous motor 304 includes a rotor 355 and a stator 410, and the rotor 355 has a magnet housing portion 370 b and a shaft hole 354 a in a core portion 368.

A permanent magnet 411 is inserted into the magnet storage portion 370b. The rotor 355 at the stage of manufacture has a lower first end ring 401 and an upper second end ring 402, and a cage-shaped secondary conductor 371 formed on the outer peripheral side of the core portion 368. Have.

  The operation and operation of the manufacturing method will be described for the synchronous motor configured as described above.

  First, as shown in FIG. 10, the first end ring 401 and the secondary conductor 371 are formed on the core portion 368 by die casting or casting using an aluminum alloy, an aluminum die cast, an aluminum cast material, or the like. At this time, the secondary conductor 371 is manufactured so as to have the protrusion 403 on the side opposite to the first end ring 401.

  In the next stage, when the permanent magnet 411 is magnetized, or when magnetizing is performed after the rotor 355 is completed, the permanent magnet 411 is inserted without being magnetized.

  In the next step, the second end ring 402 is formed. The second end ring is formed together with the protrusion 403 by a method such as die casting or casting. At this time, at least the contact surface of the protrusion 403 with the second end ring 402 is melted to ensure reliable conduction. Molding is performed.

  At this time, although the permanent magnet 411 has already been inserted, since only the second end ring 402 is subjected to heat molding such as melting, the thermal effect hardly affects the permanent magnet 411 and is magnetized. The problem of the deterioration of magnetic properties and the deterioration of the characteristics of the material can be eliminated even if it is not magnetized.

  More desirably, a method of further reducing the thermal effect is possible by melting the second end ring 402 while cooling the core portion 368 or by rapidly cooling after the melt formation.

  In any case, according to the method for manufacturing a synchronous motor of the present invention, conventionally, the first and second end rings 401 and 402 on both sides and the secondary conductor 371 are integrally formed with the permanent magnet 411 magnetized. If cast, there is a problem that the magnetic force decreases, but after the first end ring 401 and the secondary conductor 371 are die-cast, the permanent magnet 411 is inserted, and then only the second end ring 402 part is inserted. However, since it is only melted and die-cast together with the protrusion 403, the influence of the heat of fusion does not reach the permanent magnet 411, and the permanent magnet 411 is inserted in a non-magnetized state as well as when inserted. Even in this case, the permanent magnet 411 is not thermally deteriorated, and the characteristics of the permanent magnet 411 can be maintained. Therefore, a highly efficient and highly productive manufacturing method can be obtained.

  In addition, this manufacturing method can be applied to all synchronous motors in which the permanent magnet 411 is disposed within the projected areas of the first and second end rings 401 and 402, and is highly versatile.

  As described above, according to the synchronous motor-equipped compressor and the synchronous motor manufacturing method according to the present invention, an environmentally friendly compressor and synchronous motor that are highly efficient and can effectively use valuable resources can be achieved. It can be applied to refrigeration equipment such as air conditioners and various synchronous motor equipment.

The longitudinal cross-sectional view of the synchronous motor mounting compressor in Embodiment 1 of this invention Horizontal sectional view of a rotor of a compressor equipped with a synchronous motor in the same embodiment Another horizontal sectional view of the rotor in the same embodiment Another horizontal sectional view of the rotor in the same embodiment Vertical sectional view of a synchronous motor-equipped compressor according to Embodiment 2 of the present invention Horizontal sectional view of a rotor of a compressor equipped with a synchronous motor in the same embodiment Permanent magnet insertion diagram in FIG. Vertical sectional view of a synchronous motor in Embodiment 3 of the present invention FIG. 8 is a longitudinal sectional view of the rotor Manufacturing method diagram of the rotor in FIG. 9 before forming the second end ring Vertical section of a conventional compressor with a synchronous motor Horizontal section of a conventional synchronous motor

102, 202 Container 103, 203 Compression element 104, 204, 304 Synchronous motor 110, 210 Shaft 155, 255, 355 Rotor 168, 268, 368 Core part 170a, 270a, 411 Permanent magnet 170b, 270b, 370b Magnet housing part 171, 271, 371 Secondary conductor 172, 272 End ring 190, 290 Inner peripheral surface 191 Flat conductor part 192 Ferromagnetic permanent magnet 295 Slit 401 First end ring 402 Second end ring 403 Protrusion part

Claims (7)

The container accommodates a compression element and a synchronous motor, and the rotor of the synchronous motor includes a core portion, a secondary conductor, an end ring that short-circuits the secondary conductor above and below the rotor, a magnet storage portion, and a permanent magnet. The core portion is fixed to a shaft that is an element of the compression element, the secondary conductor is arranged in the vicinity of the outer periphery of the rotor, and the permanent magnet is positioned on the outer peripheral portion of the rotor. A synchronous motor-equipped compressor, wherein the compressor is disposed on an outer peripheral side of an inner peripheral surface of the end ring of the secondary conductor. 2. The synchronous motor mounted compression according to claim 1, wherein the secondary conductor has a radially long portion and a flat conductor portion that is long and flat in the circumferential direction, and a permanent magnet is disposed on the inner peripheral side of the flat conductor portion. Machine. The compressor mounted with a synchronous motor according to claim 1, wherein a permanent magnet is disposed between two adjacent secondary conductors. 4. The core part according to claim 1, wherein the core part has a slit which is a magnet housing part between adjacent secondary conductors on the outer periphery, and a permanent magnet is inserted into the slit. 5. The compressor with the synchronous motor described. The synchronous motor-equipped compressor according to claim 4, wherein the slit is formed on an outer surface of the rotor. The synchronous motor-equipped compressor according to any one of claims 2 to 4, wherein the permanent magnet is a permanent magnet having a large side near the center of the magnetic pole or a large magnetic force. The rotor of the synchronous motor has a core part, a secondary conductor, a magnet storage part, and a permanent magnet, and the secondary conductor is connected by upper and lower first and second end rings, and the secondary conductor and the first The one end ring is formed by die casting of molten metal, and has a projection of the secondary conductor on the opposite side of the first end ring in the formation stage, and the permanent magnet is stored in the magnet storage unit. Then, the second end ring is formed while being melted and integrated with the protruding portion.