JP2009131026A - Electric motor and refrigerant compressor loading the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and highly reliable electric motor, and to provide a refrigerant compressor loading the same. <P>SOLUTION: The electric motor 200 is provided with a core laminate 41, a permanent magnet 43, an end plate 44 and a balancer 46. The balancer 46 is constituted of a balancer 46b of a magnetic substance and a balancer 46a of a non-magnetic substance. The balancer 46a is arranged near the permanent magnet 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an electric motor used in various industrial machines such as an air conditioner and a refrigeration apparatus, and a refrigerant compressor equipped with the electric motor, and particularly, an electric motor capable of reducing cost and improving reliability and refrigerant compression equipped with the electric motor. Related to the machine.

  In recent years, various types of electric motors are required to be highly efficient and resource-saving (smaller and lighter) from the viewpoints of energy saving and environmental protection. As one of the realization methods, “a number of iron core punches having a plurality of magnet insertion openings in the vicinity of the outer periphery are laminated to form an iron core laminate, and a permanent magnet is inserted into the magnet insertion opening. In addition, in the permanent magnet rotor in which end plates are provided on both end faces of the core laminate, and rivets are inserted and fixed by caulking through a plurality of rivet insertion holes formed in the core laminate and both end plates, The rivet insertion hole is provided in the vicinity of the magnet insertion opening so as to deform a part of the inner peripheral wall surface of the magnet insertion opening corresponding to the radial bulge of the rivet during caulking of the rivet. There is a magnetic rotor (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 5-260686 (page 4, FIG. 8)

  The permanent magnet type rotor described in Patent Document 1 has a configuration in which an end plate and a balancer are arranged in the upper part of the permanent magnet in the axial direction. For this reason, when the end plate or balancer is made of a magnetic material, the magnetic flux in the axial direction of the magnetic flux generated from the magnet is short-circuited, and the predetermined magnetic force does not come out in the radial direction. The magnetic flux will decrease. If it does so, the predetermined performance requested | required of the electric motor provided with this permanent magnet type rotor cannot be exhibited. Therefore, in the permanent magnet type rotor, it is common to form the end plate and the balancer with a non-magnetic material.

  Further, the balancer is required to have mechanical strength because centrifugal force is applied as the rotor rotates. For this reason, a metal (for example, brass or SUS) is often selected as the material. Such non-magnetic metals are generally expensive and require a lot of cost to manufacture a permanent magnet rotor. Furthermore, if the balancer and the end plate are made of different materials, electrolytic corrosion occurs due to the difference in ionization tendency between the balancer and the end plate, resulting in deterioration of mechanical strength, deterioration of lubricating oil, sludge (solid particles And a liquid (a mixture of water and the like) and the like may occur, which may reduce the reliability of the electric motor, and also reduce the reliability of the compressor and the like on which the electric motor is mounted.

  The present invention has been made to solve the above-described problems, and provides an inexpensive and highly reliable electric motor and a refrigerant compressor equipped with the electric motor.

  An electric motor according to the present invention includes an iron core laminate formed by laminating a plurality of disk-shaped iron core punches formed with magnet insertion openings for inserting permanent magnets, and the magnet insertion openings. A permanent magnet inserted into the core stack, end plates provided at both axial ends of the core stack, and at least one end plate provided in the core stack. And a balancer for stabilizing the rotation of the rotating shaft. The balancer is configured by stacking a nonmagnetic plate and a magnetic plate, and the nonmagnetic plate is disposed closer to the permanent magnet. It is characterized by that.

  An electric motor according to the present invention includes an iron core laminate formed by laminating a plurality of disk-shaped iron core punches formed with magnet insertion openings for inserting permanent magnets, and the magnet insertion openings. A permanent magnet inserted into the core stack, end plates provided at both axial ends of the core stack, and at least one end plate provided in the core stack. And a balancer that stabilizes the rotation of the rotating shaft, and a spacer member made of a non-magnetic material is provided between the permanent magnet and the end plate.

  An electric motor according to the present invention includes an iron core laminate formed by laminating a plurality of disk-shaped iron core punches formed with magnet insertion openings for inserting permanent magnets, and the magnet insertion openings. A permanent magnet inserted into the core stack, end plates provided at both axial ends of the core stack, and at least one end plate provided in the core stack. And a balancer for stabilizing the rotation of the rotating shaft, and by making the axial length of the permanent magnet shorter than the length between the end plates, an air gap is formed between the permanent magnet and the end plate. It is formed.

  A refrigerant compressor according to the present invention includes the above-described electric motor.

  According to the electric motor according to the present invention, the magnetic flux in the axial direction of the magnetic flux generated from the permanent magnet is not short-circuited. Moreover, short-circuiting of the magnetic flux in the axial direction among magnetic fluxes generated from the permanent magnet can be prevented without using a complicated structure. Therefore, it is possible to provide an inexpensive and highly reliable electric motor. Moreover, according to the refrigerant compressor which concerns on this invention, since the above-mentioned electric motor is mounted, it has all the effects which an electric motor has.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing an example of a sectional configuration of a refrigerant compressor 100 according to Embodiment 1 of the present invention. Based on FIG. 1, the structure and operation | movement of the refrigerant compressor 100 are demonstrated. This refrigerant compressor 100 is shown as an example of a scroll compressor. For example, a component of a refrigeration cycle (heat pump cycle) such as a refrigerator, a freezer, a vending machine, an air conditioner, a refrigeration apparatus, or a water heater. It will be. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

  The refrigerant compressor 100 sucks the refrigerant circulating in the refrigeration cycle, compresses it, and discharges it as a high-temperature and high-pressure state. The refrigerant compressor 100 can be classified into a compression unit 16 and a drive unit 17. The compression unit 16 and the drive unit 17 are accommodated in a sealed container (shell) 10. The sealed container 10 is a pressure container. As shown in FIG. 1, the compression unit 16 is disposed on the upper side of the sealed container 10, and the driving unit 17 is disposed on the lower side of the sealed container 10. The bottom of the hermetic container 10 is a sump 11 for storing the refrigerating machine oil 1. In addition, the closed container 10 is connected to a suction side pipe 12 for sucking refrigerant gas and a discharge side pipe 13 for discharging refrigerant gas.

  The compression unit 16 has a function of compressing the refrigerant gas sucked from the suction side pipe 12 and discharging it to the discharge space 15 in the sealed container 10. The refrigerant gas discharged into the discharge space 15 is discharged from the discharge side pipe 13 to the outside of the refrigerant compressor 100. The drive unit 17 serves to drive the orbiting scroll 24 constituting the compression unit 16 in order to compress the refrigerant gas by the compression unit 16. That is, when the drive unit 17 drives the orbiting scroll 24 via the crankshaft 21, the compression unit 16 compresses the refrigerant gas.

  The compression unit 16 is roughly configured by a turning scroll 24, a fixed scroll 28, and a frame 31. As shown in FIG. 1, the orbiting scroll 24 is arranged on the lower side, and the fixed scroll 28 is arranged on the upper side. The fixed scroll 28 is formed with a lap portion 29 which is a spiral projection standing on one surface. Further, the orbiting scroll 24 is also provided with a wrap portion 25 that is a spiral protrusion that is erected on one surface and has substantially the same shape as the wrap portion 29. The orbiting scroll 24 and the fixed scroll 28 are mounted in the sealed container 10 with the lap portion 25 and the lap portion 29 meshing with each other. And between the lap | wrap part 25 and the lap | wrap part 29, the compression chamber 18 from which a volume changes relatively is formed.

  The fixed scroll 28 is fixed to the frame 31 with a bolt or the like (not shown). A discharge port 30 for discharging the compressed and high-pressure refrigerant gas is formed at the center of the fixed scroll 28. The compressed and high pressure refrigerant gas is discharged into the discharge space 15 provided in the upper part of the fixed scroll 28. The orbiting scroll 24 performs a revolving orbiting movement without rotating about the fixed scroll 28. A hollow cylindrical orbiting scroll boss portion 26 is formed at a substantially central portion of a surface (hereinafter referred to as a thrust surface) opposite to the surface on which the orbiting scroll 24 forms the lap portion 25. An eccentric pin portion 22 provided at the upper end of a crankshaft 21 to be described later is fitted (engaged) with the orbiting scroll boss portion 26.

  The frame 31 is fixed to the inner peripheral surface of the sealed container 10, and a through hole is formed in the center portion for allowing the crankshaft 21 to pass therethrough. Further, the frame 31 is formed with an oil drain hole 32 penetrating from the thrust surface 27 side of the orbiting scroll 24 to the lower side in the axial direction so that the refrigerating machine oil 1 that lubricates the thrust surface 27 is returned to the sump 11. It has become. Although FIG. 1 shows an example in which only one oil drain hole 32 is formed, the present invention is not limited to this. For example, two or more oil drain holes 32 may be formed. Note that the outer peripheral surface of the frame 31 may be fixed to the inner peripheral surface of the sealed container 10 by shrink fitting, welding, or the like.

  The drive unit 17 includes a rotor (permanent magnet type rotor) 19 fixed to the crankshaft 21, a stator 20 that is housed in the hermetic container 10 and is fixedly held, and a crankshaft 21 that is a rotating shaft. ing. The rotor 19 is fixed to the crankshaft 21 and is rotationally driven when the energization of the stator 20 starts to rotate the crankshaft 21. Further, the outer peripheral surface of the stator 20 is fixedly supported by the sealed container 10 by shrink fitting or the like. That is, the rotor 19 and the stator 20 constitute a motor (electric motor). The electric motor will be described in detail below.

  The crankshaft 21 rotates with the rotation of the rotor 19 to turn the orbiting scroll 24. At the upper end portion of the crankshaft 21, an eccentric pin portion 22 that is rotatably fitted to the orbiting scroll boss portion 26 of the orbiting scroll 24 is formed. Further, an oil supply passage 23 communicating with the upper end surface is formed inside the crankshaft 21. The oil supply passage 23 becomes a passage for the refrigerating machine oil 1 stored in the sump 11. The refrigerating machine oil 1 accumulated in the sump 11 sucks up the refrigerating machine oil 1 as the crankshaft 21 rotates, flows through the oil supply passage 23 and is supplied to the compression unit 16.

  An Oldham ring 33 is disposed between the orbiting scroll 24 and the fixed scroll 28 to prevent the rotation of the orbiting scroll 24 during the eccentric orbiting movement. The Oldham ring 33 is disposed between the orbiting scroll 24 and the fixed scroll 28 and serves to prevent the orbiting scroll 24 from rotating and to enable a revolving orbiting movement. That is, the Oldham ring 33 functions as a rotation prevention mechanism for the orbiting scroll 24.

Here, the operation of the refrigerant compressor 100 will be briefly described.
The rotor 19 constituting the motor rotates by receiving a rotational force from a rotating magnetic field generated by the stator 20. Along with this, the crankshaft 21 fixed to the rotor 19 is rotationally driven. The orbiting scroll 24 is engaged with the eccentric pin portion 22 of the crankshaft 21, and the rotating rotation motion of the orbiting scroll 24 is converted into the revolution orbiting motion by the rotation preventing mechanism of the Oldham ring 33. As the crankshaft 21 rotates, the refrigerant gas in the hermetic container 10 flows into the compression chamber 18 formed by the lap portion 29 of the fixed scroll 28 and the lap portion 25 of the orbiting scroll 24, and the suction process starts.

  When the refrigerant gas is sucked into the compression chamber 18, the revolving orbiting motion of the eccentric orbiting scroll 24 shifts to a compression process for reducing the volume of the compression chamber 18. In other words, in the compression unit 16, when the orbiting scroll 24 revolves orbitally, the refrigerant gas is taken in from the outermost peripheral openings of the wrap portion 25 of the orbiting scroll 24 and the lap portion 29 of the fixed scroll 28 that serve as suction ports, It goes toward the center while being gradually compressed with the rotation of 24. The low-pressure refrigerant that has circulated through the refrigeration cycle flows into the sealed container 10 from the suction side pipe 12.

  Then, the refrigerant gas compressed in the compression chamber 18 moves to the discharge process. That is, the refrigerant gas passes through the discharge port 30 of the fixed scroll 28 and is discharged to the outside of the refrigerant compressor 100 after passing through the discharge space 15. The refrigerant discharged from the discharge side pipe 13 of the refrigerant compressor 100 is in a high-temperature and high-pressure state, and first flows into the condenser constituting the refrigeration cycle. It circulates and is sucked into the refrigerant compressor 100 again. Then, when the energization to the stator 20 is stopped, the refrigerant compressor 100 stops.

  FIG. 2 is a longitudinal sectional view showing a sectional configuration of the electric motor 200 according to the first embodiment. The electric motor 200 will be described in detail based on FIG. The electric motor 200 is mounted as the drive unit 17 of the refrigerant compressor 10 described above, and has a function of rotating the crankshaft 21. The electric motor 200 constitutes the drive unit 17, and includes a rotor 19 fixed to the crankshaft 21, a stator 20 fixedly held in the sealed container 10, and a crankshaft 21 as a drive shaft as main components. It is said. Further, the electric motor 200 is characterized in that a permanent magnet type rotor using the permanent magnet 3 is adopted.

  The electric motor 200 includes an iron core laminate 41 formed by laminating a plurality of disc-shaped iron core punches 48 and a permanent magnet inserted through the stone insertion opening 2 and attached to the iron core laminate 41. 43 and an end plate 44 that is provided at both ends in the axial direction of the iron core laminate 41 and is formed of a disk-shaped iron plate so as to cover both the magnet insertion opening 42 and both ends in the axial direction of the permanent magnet 43. The rivet 45 for caulking and fixing the iron core laminate 41 and the end plate 44 and the one end plate 44 (the end plate 44 on the lower side of the drawing) are provided on the opposite side of the iron core laminate 41 side. It is comprised with the balancer 46 fixed.

  The iron core laminate 41 has a plurality of magnet insertion openings 42 in the vicinity of the outer periphery, a rivet insertion hole 45a (see FIG. 2B) in the vicinity of the magnet insertion opening 42, and a rotating shaft inserted in the center. Each hole 49 is formed. That is, the iron core laminated body 41 is configured by laminating a plurality of iron core punched plates 48 in which the magnet insertion opening 42, the rivet insertion hole 45a, and the rotating shaft insertion hole 49 are formed. The opening 42 for magnet insertion should just be a shape which can insert the permanent magnet 43, and does not specifically limit a shape. The end plate 44 is made of a non-magnetic iron plate, and has a rivet insertion hole 45a and a rotary shaft insertion hole 49a. The end plate 44 is arranged so that the center of the rotation shaft insertion hole 49a is on the same line as the center of the rotation shaft insertion hole 49 of the iron core laminate 41 (line X shown in the figure).

  The rivet 45 is inserted into a plurality of rivet insertion holes 45a formed in the iron core laminate 41 and the end plate 44, and the iron core laminate 41 and the end plate 44 are caulked and fixed, and the balancer 46 is also fixed. ing. The balancer 46 is for stabilizing the rotation of the rotating shaft, and is fixed together with one end plate 44 (the end plate 44 on the lower side of the drawing) by a plurality of adjacent rivets 45. . As shown in FIG. 2, the balancer 46 is configured by laminating a plurality of plate materials (balancer 46 a and balancer 45 b). In addition, each plate member may be formed by stacking one plate member, or may be formed by a plurality of substantially semicircular plate members (see FIG. 2B). For example, the balancer 46 may be configured by combining two substantially semicircular plate members as a set and stacking them in several layers.

  The balancer 46 includes a non-magnetic balancer 46a and a magnetic balancer 46b. The balancer 46 a is disposed so as to be sandwiched between the balancer 46 b and the end plate 44. That is, the balancer 46a is arranged on the upper side of the drawing, the balancer 46b is arranged on the lower side of the drawing, and the balancer 46b, the balancer 46a, and the end plate 44 are arranged in this order. This is because the balancer 46b made of a magnetic material is placed at a predetermined distance from the permanent magnet 43. In addition, the axial thickness of the balancer 46 a is set to a minimum thickness equal to or greater than the radial thickness of the permanent magnet 43 together with the thickness of the end plate 44.

  In the electric motor 200 configured as described above, end plates 44 made of a non-magnetic material are provided at both axial ends of the permanent magnet 43, and a non-magnetic material is provided at one axial end portion (lower side of the drawing) of the permanent magnet 43. Since a predetermined amount of the balancer 46a is arranged, the magnetic flux in the axial direction of the magnetic flux generated from the permanent magnet 43 is not short-circuited. Further, since the balancer 46b made of a magnetic material is separated from the permanent magnet 43 at a predetermined distance, the magnetic resistance from the permanent magnet 43 is high, and a magnetic flux short circuit does not occur. That is, the magnetic flux generated from the permanent magnet 43 is directed only in the radial direction (effective magnetic flux (arrow shown in the figure)).

  As described above, in the electric motor 200, the balancer 46 is configured by the non-magnetic balancer 46a and the magnetic balancer 46b. Therefore, the balancer is made of an inexpensive sheet metal such as a SPHC material (hot rolled steel plate). 46b can be configured. Therefore, the electric motor 200 can suppress the cost required for manufacturing and can be highly reliable. Further, by adopting the laminated structure balancer 46, the number of sheets can be changed and the balance amount can be adjusted. Therefore, even when the balance amount of the electric motor 200 is different, a balancer having a new thickness is unnecessary, and the production efficiency is improved.

  In the first embodiment, the case where the balancer 46 is disposed on the bottom side of the electric motor 200 has been described as an example. However, the present invention is not limited to this, and the balancer 46 is disposed on both the upper portion, the bottom portion, and the upper portion of the electric motor 200. You may do it. In the first embodiment, the balancer 46a and the balancer 46b are shown as an example in which a plurality of plate members are laminated. However, the present invention is not limited to this, and the balancer 46a and the balancer 46b are formed as a single sheet. You may make it comprise with a board | plate material. In particular, the balancer 46 a only needs to have a thickness in the axial direction equal to or greater than the thickness of the permanent magnet 43 in combination with the thickness of the end plate 44. Furthermore, if the balancer 64a and the balancer 64b are made of materials that are not so different in ionization tendency, it is possible to prevent electrolytic corrosion that occurs due to a difference in ionization tendency. Note that prevention of electrolytic corrosion will be described in detail in Embodiment 6.

Embodiment 2.
FIG. 3 is an explanatory diagram for explaining a configuration of an electric motor 300 according to Embodiment 2 of the present invention. The electric motor 300 will be described in detail based on FIG. FIG. 3A is a longitudinal sectional view showing a sectional configuration of the electric motor 300, and FIG. 3B is a plan view showing an AA section of the electric motor 300. The electric motor 300 is mounted on the refrigerant compressor 100 described in the first embodiment in the same manner as the electric motor 200 and has a function of rotating the crankshaft 21. Further, the electric motor 300 is characterized in that a permanent magnet type rotor using the permanent magnet 3 is adopted. In the second embodiment, differences from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  The electric motor 300 according to the second embodiment is different from the electric motor 200 according to the first embodiment in that a part of one end plate 44 (lower side in the drawing) is substituted by the balancer 46. As shown in FIG. 3B, a part of a pair of balancers 46a made of a non-magnetic material replaces one end plate 44. That is, a part of a set of two balancers 46 a made of a non-magnetic material also serves as one end plate 44. A part of the two substantially semicircular balancers 46a constituting the balancer 46 (the balancer 46a at the top of the drawing) and one end of the magnet insertion opening 42 and the permanent magnet 43 in the axial direction (lower side of the drawing). It is intended to cover.

  Even in such a case, it is desirable that the thickness of the balancer 46a in the axial direction is a minimum thickness not less than the radial thickness of the permanent magnet 43. That is, the thickness of the balancer 46a is required by the thickness of the end plate 4 than described in the first embodiment. Also in this case, the center of the rotation shaft insertion hole 49a of the balancer 46a serving as a substitute for the end plate 44 is collinear with the center of the rotation shaft insertion hole 49 of the core laminate 41 (line X shown in the figure). In addition, two substantially semi-circular balancers 46a are arranged in a circular shape.

  As described above, since the electric motor 300 replaces one end plate 44 with a part of the balancer 46, a new part constituting the end plate 44 is not necessary, and the types of parts can be reduced. Since a predetermined amount of balancer 46a made of a non-magnetic material is disposed at one end (downward in the drawing) of the permanent magnet 43 in the axial direction, the magnetic flux in the axial direction of the magnetic flux generated from the permanent magnet 43 is short-circuited. There is nothing. Further, since the balancer 46b made of a magnetic material is separated from the permanent magnet 43 at a predetermined distance, the magnetic resistance from the permanent magnet 43 is high, and a magnetic flux short circuit does not occur. That is, the magnetic flux generated from the permanent magnet 43 is directed only in the radial direction.

  In the second embodiment, the case where the balancer 46 is disposed on the bottom side of the electric motor 300 has been described as an example. However, the present invention is not limited to this, and the balancer 46 is disposed on both the upper portion, the bottom portion, and the upper portion of the electric motor 300. You may do it. In the second embodiment, the balancer 46a and the balancer 46b are shown as an example in which a plurality of plate members are stacked. However, the present invention is not limited to this, and the balancer 46a and the balancer 46b are formed as a single sheet. You may make it comprise with a board | plate material. In particular, the balancer 46 a only needs to have a thickness in the axial direction equal to or greater than the thickness in the radial direction of the permanent magnet 43. Furthermore, if the balancer 64a and the balancer 64b are made of materials that are not so different in ionization tendency, it is possible to prevent electrolytic corrosion that occurs due to a difference in ionization tendency.

Embodiment 3.
FIG. 4 is a longitudinal sectional view showing a sectional configuration of an electric motor 400 according to Embodiment 3 of the present invention. Based on FIG. 4, the structure of the electric motor 400 is demonstrated. The electric motor 400 is mounted on the refrigerant compressor 100 described in the first embodiment, like the electric motor 200 and the electric motor 300, and has a function of rotating the crankshaft 21. In addition, the electric motor 400 is characterized in that a permanent magnet type rotor using the permanent magnet 3 is employed. In the third embodiment, differences from the first and second embodiments will be mainly described, and the same parts as those in the first and second embodiments will be denoted by the same reference numerals and the description thereof will be omitted. It shall be.

  The electric motor 400 according to the third embodiment is related to the electric motor 200 according to the first embodiment and the second embodiment in that spacer members 47 made of a non-magnetic material are inserted into both end portions of the permanent magnet 43 in the axial direction. This is different from the electric motor 300. That is, in the electric motor 400, the spacer member 47 is provided between the permanent magnet 43 and the end plate 44, and a predetermined distance is formed at both axial ends of the permanent magnet 43. As for the thickness of the spacer member 47 in the axial direction, it is desirable that the thickness not less than the thickness of the permanent magnet 43 in the radial direction be the minimum. By doing so, the end plate 44 and the balancer 46 can be made of a magnetic material.

  As described above, since the electric motor 400 is provided with the spacer member 47 made of a non-magnetic material at both axial ends of the permanent magnet 43, the magnetic flux in the axial direction of the magnetic flux generated from the permanent magnet 43 is not short-circuited. Magnetic flux goes to the stator side (deformation direction) (effective magnetic flux (arrow shown in the figure)). Therefore, the electric motor 400 can further prevent performance degradation in addition to the effects of the electric motor 200 according to the first embodiment and the electric motor 300 according to the second embodiment. In the electric motor 400, if the end plate 44 and the balancer 46 are made of a magnetic material, for example, a sheet metal such as an SPHC material, it is possible to suppress the cost required for manufacturing.

  In the third embodiment, the case where the balancer 46 is arranged on the bottom side of the electric motor 400 has been described as an example. However, the present invention is not limited to this, and the balancer 46 is arranged on both the upper part, the bottom part, and the upper part of the electric motor 400. You may do it. The spacer member 47 is not particularly limited as long as it is made of a nonmagnetic material. Further, in the third embodiment, the case where the end plates 44 are arranged at both axial ends of the permanent magnet 43 is shown as an example. However, as in the electric motor 300 according to the second embodiment, a part of the balancer 46 is used. One end plate 44 may also be used.

Embodiment 4.
FIG. 5 is a longitudinal sectional view showing a sectional configuration of an electric motor 500 according to Embodiment 4 of the present invention. Based on FIG. 5, the structure of the electric motor 500 is demonstrated. The electric motor 500 is mounted on the refrigerant compressor 100 described in the first embodiment, like the electric motor 200, the electric motor 300, and the electric motor 400, and has a function of rotating the crankshaft 21. Further, the electric motor 500 is characterized in that a permanent magnet type rotor using the permanent magnet 3 is adopted. In the fourth embodiment, differences from the first to third embodiments will be mainly described, and the same parts as those in the first to third embodiments will be denoted by the same reference numerals and the description thereof will be omitted. It shall be.

  In the electric motor 500 according to the fourth embodiment, a plurality of stoppers 41a are formed on the inner wall surface (contact surface with the permanent magnet 43) of the iron core laminate 41, and air gaps (air gaps) are formed at both axial ends of the permanent magnet 43. 50 is different from the electric motor 200 according to the first embodiment, the electric motor 300 according to the second embodiment, and the electric motor 400 according to the third embodiment. That is, in the electric motor 500, the length range in the axial direction of the permanent magnet 43 is restricted by the stopper 41a, and the air gap 50 having a predetermined length in the axial direction is formed. It is desirable that the distance in the axial direction of the air gap 50 is a minimum distance that is equal to or greater than the radial thickness of the permanent magnet 43. By doing so, the end plate 44 and the balancer 46 can be made of a magnetic material.

  As described above, since the electric motor 500 has the air gap 50 formed at both axial ends of the permanent magnet 43, the magnetic flux generated in the permanent magnet 43 in the axial direction is not short-circuited, and the magnetic flux is on the stator side. (Effective magnetic flux (arrow shown in the figure)). Therefore, the electric motor 500 can further prevent performance degradation in addition to the effects of the electric motor 200 according to the first embodiment, the electric motor 300 according to the second embodiment, and the electric motor 400 according to the third embodiment. Further, if the end plate 44 and the balancer 46 are made of a magnetic material, for example, a sheet metal such as an SPHC material, the cost required for manufacturing can be further suppressed.

  In the fourth embodiment, the case where the balancer 46 is disposed on the bottom side of the electric motor 500 has been described as an example. However, the present invention is not limited to this, and the balancer 46 is disposed on both the upper portion, the bottom portion, and the upper portion of the electric motor 500. You may do it. Further, in the fourth embodiment, the case where the end plates 44 are arranged at both axial ends of the permanent magnet 43 is shown as an example. However, like the electric motor 300 according to the second embodiment, a part of the balancer 46 is used. One end plate 44 may also be used. Furthermore, the stopper 41a is not particularly limited in shape and size as long as the air gap 50 can be secured.

Embodiment 5.
FIG. 6 is a longitudinal sectional view showing a sectional configuration of an electric motor 600 according to Embodiment 5 of the present invention. Based on FIG. 6, the structure of the electric motor 600 is demonstrated. The electric motor 600 is mounted on the refrigerant compressor 100 described in the first embodiment in the same manner as the electric motor 200, the electric motor 300, the electric motor 400, and the electric motor 500, and has a function of rotationally driving the crankshaft 21. Further, the electric motor 600 is characterized in that a permanent magnet type rotor using the permanent magnet 3 is adopted. In the fifth embodiment, differences from the first to fourth embodiments will be mainly described, and the same parts as those in the first to fourth embodiments will be denoted by the same reference numerals and the description thereof will be omitted. It shall be.

  The electric motor 600 according to the fifth embodiment is characterized in that the end plate 44 and the balancer 46 are made of the same material. If the end plate 44 and the balancer 46 are made of different materials, electrolytic corrosion occurs at the joint portion due to the difference in ionization tendency. This electrolytic corrosion induces deterioration of mechanical strength, deterioration of lubricating oil, etc. and generation of sludge. In addition, since the internal temperature of the sealed container 10 of the refrigerant compressor 100 on which the electric motor 600 is mounted varies depending on the heat generated by the electric motor 600 and the temperature of the suction refrigerant, there is a high possibility that electrolytic corrosion will occur. Therefore, in the electric motor 600, the end plate 44 and the balancer 46 are made of the same material, and the occurrence of electrolytic corrosion can be effectively prevented. However, also in this case, it is required not to short-circuit the magnetic flux in the axial direction among the magnetic flux generated from the permanent magnet 43.

  That is, it is preferable to apply the feature matter of the electric motor 600 in combination with the feature matter of the electric motor 400 according to the third embodiment and the electric motor 500 according to the fourth embodiment. For example, in the state where the spacer member 47 and the air gap 50 are provided, the material of the end plate 44 and the balancer 46 may be a non-magnetic material or a magnetic material. The end plate 44 and the balancer 46 can be made of the same material. By doing so, the ionization tendency of the end plate 44 and the balancer 46 becomes the same, so that the electrolytic corrosion at the joint portion between the end plate 44 and the balancer 46 can be prevented.

  As described above, in the electric motor 600, since the end plate 44 and the balancer 46 are made of the same material, there is no possibility of electrolytic corrosion that occurs due to a difference in ionization tendency between the balancer 46 and the end plate 44. It prevents deterioration of mechanical strength, deterioration of lubricating oil, etc. and generation of sludge, and does not reduce reliability. Further, when the features of the electric motor 600 are combined with the features of the electric motor 400 according to the third embodiment and the electric motor 500 according to the fourth embodiment, the spacer member 47 made of a nonmagnetic material at both axial ends of the permanent magnet 43. In addition, because of the air gap 50, it is possible not to short-circuit the magnetic flux in the axial direction among the magnetic flux generated from the permanent magnet 43 (arrows shown in the figure).

  In the fifth embodiment, the case where the balancer 46 is disposed on the bottom side of the electric motor 600 has been described as an example. However, the present invention is not limited to this, and the balancer 46 is disposed on both the upper portion and the bottom portion and the upper portion of the electric motor 600. You may do it. Moreover, the material which comprises the end plate 44 and the balancer 46 should just be the same, and does not specifically limit a material. Furthermore, when combined with the third and fourth embodiments, the material constituting the end plate 44 and the balancer 46 may be a non-magnetic material or a magnetic material.

Embodiment 6 FIG.
The ionization tendency of the end plate 44 and the balancer 46 will be described in detail. If the end plate 44 and the balancer 46 are made of different metals, the standard electrode potentials of the two are different, so that a potential difference occurs, ionization of the metal occurs, and electrolytic corrosion occurs. In general, in the refrigerant compressor, the end plate 44 is often made of SUS304 (standard electrode potential: 0.80) and the balancer 46 is made of brass (standard electrode potential: -0.04). Then, the difference between the standard electrode potentials of both becomes about 0.8. In Volta batteries, zinc (Zn) and copper (Cu) are ionized (electro-corrosion) at a potential difference of about 1.0, and if there is an electrolyte (for example, water) at a potential difference greater than this, electro-corrosion occurs. It occurs easily.

  Therefore, it is considered that the occurrence of electrolytic corrosion can be prevented if the potential difference is 0.8 or less from the viewpoint of the performance of the refrigerant compressor. For example, if the end plate 44 is made of SUS304 and the balancer 46 is made of zinc (standard electrode potential: −0.76), the potential difference exceeds 1.0, and galvanic corrosion tends to occur. Therefore, the refrigerant compressor 100 according to the first to fifth embodiments is characterized in that the end plate 44 and the balancer 46 are made of the same material or are made of a material having a close ionization tendency. The occurrence of electrolytic corrosion can be prevented regardless of the amount of water and the amount of water.

3 is a longitudinal sectional view showing an example of a sectional configuration of the refrigerant compressor according to Embodiment 1. FIG. 1 is a longitudinal sectional view showing a sectional configuration of an electric motor according to Embodiment 1. FIG. FIG. 6 is an explanatory diagram for explaining a configuration of an electric motor according to a second embodiment. 6 is a longitudinal sectional view showing a sectional configuration of an electric motor according to Embodiment 3. FIG. FIG. 6 is a longitudinal sectional view showing a sectional configuration of an electric motor according to a fourth embodiment. FIG. 10 is a longitudinal sectional view showing a sectional configuration of an electric motor according to Embodiment 5.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Refrigerating machine oil, 10 airtight container, 11 sump, 12 suction side piping, 13 discharge side piping, 15 discharge space, 16 compression part, 17 drive part, 18 compression chamber, 19 rotor (permanent magnet type rotor), 20 fixation Child, 21 Crankshaft, 22 Eccentric pin part, 23 Oil supply flow path, 24 Orbiting scroll, 25 Wrap part, 26 Orbiting scroll boss part, 27 Thrust surface, 28 Fixed scroll, 29 Wrap part, 30 Discharge port, 31 Frame, 32 Oil drain hole, 33 Oldham ring, 41 Iron core laminate, 41a Stopper, 42 Magnet insertion opening, 43 Permanent magnet, 44 End plate, 45 Rivet, 45a Rivet insertion hole, 46 balancer, 46a balancer, 46b Balancer, 47 spacer Member, 48 Iron core punch, 49 Rotating shaft insertion hole, 49a Rotating shaft insertion hole , 50 air gap, 100 refrigerant compressor, 200 electric motor, 300 electric motor, 400 electric motor, 500 electric motor, 600 electric motor.

Claims (13)

An iron core laminate formed by laminating a plurality of disk-shaped iron core punches having magnet insertion openings for inserting permanent magnets; and
A permanent magnet inserted from the magnet insertion opening and inserted into the core laminate;
End plates provided at both ends in the axial direction of the core laminate,
A balancer that is provided on at least one end plate provided in the iron core laminate and stabilizes rotation of the rotary shaft;
The balancer is configured by stacking a nonmagnetic plate and a magnetic plate, and the nonmagnetic plate is disposed closer to the permanent magnet. 2. The electric motor according to claim 1, wherein a thickness of the non-magnetic material plate in an axial direction is equal to or greater than a thickness of the permanent magnet in a radial direction. An iron core laminate formed by laminating a plurality of disk-shaped iron core punches having magnet insertion openings for inserting permanent magnets; and
A permanent magnet inserted from the magnet insertion opening and inserted into the core laminate;
End plates provided at both ends in the axial direction of the core laminate,
A balancer that is provided on at least one end plate provided in the iron core laminate and stabilizes rotation of the rotary shaft;
An electric motor comprising a spacer member made of a non-magnetic material between the permanent magnet and the end plate. The electric motor according to claim 3, wherein the thickness of the spacer member in the axial direction is equal to or greater than the thickness of the permanent magnet in the radial direction. An iron core laminate formed by laminating a plurality of disk-shaped iron core punches having magnet insertion openings for inserting permanent magnets; and
A permanent magnet inserted from the magnet insertion opening and inserted into the core laminate;
End plates provided at both ends in the axial direction of the core laminate,
A balancer that is provided on at least one end plate provided in the iron core laminate and stabilizes rotation of the rotary shaft;
An electric motor in which an air gap is formed between the permanent magnet and the end plate by making an axial length of the permanent magnet shorter than a length between the end plates. The electric motor according to claim 5, wherein a distance in an axial direction of the air gap is equal to or greater than a thickness in a radial direction of the permanent magnet. The electric motor according to claim 5 or 6, wherein a stopper that makes the length of the permanent magnet in the axial direction shorter than the length between the end plates is provided on the inner wall surface of the iron core laminate. The electric motor according to claim 1, wherein the balancer also serves as the end plate. The electric motor according to any one of claims 3 to 7, wherein the end plate and the balancer are made of a magnetic material. The electric motor according to any one of claims 3 to 7, wherein the end plate and the balancer are made of the same magnetic or non-magnetic material. The electric motor according to claim 1, wherein the balancer is composed of a plurality of plate members. The electric motor according to claim 1, wherein the balancer is configured by combining substantially semicircular plate members. A refrigerant compressor comprising the electric motor according to any one of claims 1 to 12.

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