JP2017028862A - Rotor, rotary electric machine, electrically-driven compressor and refrigeration air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor of a rotary electric machine capable of efficiently cooling permanent magnets.SOLUTION: The rotor comprises: a rotor core formed by laminating a core sheet 1 presenting a shape symmetric to an axis of rotation (n) times; permanent magnets embedded in permanent magnet insertion holes which are provided in the rotor core, so as to have an interval (d) in a radial direction; end plates which are provided in both ends of the rotor core; and fluid suction holes which are provided in the end plates so as to be communicated with the permanent magnet insertion holes. One of equally divided (n) portions for each magnetic pole in the core sheet 1 further includes: an inner peripheral side core part 2; an outer peripheral side core part 3; a plurality of coupling parts 5 and 6 for coupling the inner peripheral side core part 2 and the outer peripheral side core part 3; a plurality of magnet insertion openings 9a and 9b provided in parallel with each other in a rotation direction via the coupling part 5 between the inner peripheral side core part 2 and the outer peripheral side core part 3 so as to form the permanent magnet insertion holes in the case where the core sheets are laminated; and a fluid discharge path 8 in which at least one of the magnet insertion openings 9a and 9b is communicated to the outside at an outer peripheral side of the rotor core.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotor of a permanent magnet built-in type rotating electrical machine. The present invention also relates to an electric compressor using the rotating electric machine and a refrigeration air conditioner equipped with the electric compressor.

  A rotating electrical machine using a permanent magnet as a rotor rotates the rotor by the interaction between a magnetic field generated by a permanent magnet embedded in the rotor and a magnetic field generated by passing a current through a coil provided in the stator. Is what you get. Such a rotating electrical machine is widely used for an electric compressor of a refrigerating and air-conditioning apparatus such as an air conditioner or a refrigerating apparatus using a refrigeration cycle, a motor generator of an electric vehicle or a hybrid electric vehicle, and the like. In such rotating electrical machines, eddy current loss occurs in the permanent magnet due to the influence of the magnetic flux from the stator coil during high-speed rotation and the fluctuation of the magnetic flux due to the interaction with the iron core shape. As a result, the demagnetization resistance decreases. Therefore, such a rotating electrical machine requires a cooling technique for the permanent magnet in the rotor.

  For example, in a rotor of a conventional rotating electrical machine, a plurality of axial cooling passages that penetrate the rotor in the direction of the rotation axis are provided around the rotation shaft, and communicated with these axial cooling passages so that the outer periphery from the inner side of the rotor A plurality of radial cooling passages connected to the surface are provided side by side in the rotation axis direction, and the radial cooling passages are provided radially from the inner side to the outer peripheral surface of the rotor. The rotor is composed of a rotor core formed by laminating electromagnetic steel plates, and end plates having thicknesses provided at both ends of the rotor core, and the radial cooling passage is formed by both the rotor core and the end plate. Was provided. With this structure, when the rotor is rotated, air as a cooling medium is sucked from the end plates at both ends of the rotor into the axial cooling passage and discharged from the outer peripheral surface side of the rotor through the radial cooling passage. An air flow was formed, and the rotor and the permanent magnet were cooled by this air flow (see, for example, Patent Document 1).

JP 2008-125330 A

  In the rotor of the conventional rotating electric machine described in Patent Document 1, the structure in which the permanent magnet and the air are not in direct contact with each other near the center of the rotor core in the axial direction is provided. Since the permanent magnet is indirectly cooled, the cooling efficiency of the permanent magnet is insufficient. That is, since the permanent magnet is in contact with the radial cooling passage of the end plate at the axial end of the rotor, the air flow can directly cool the permanent magnet, but the axial direction of the rotor core is likely to rise in temperature. In the vicinity of the center, there is a problem that the permanent magnet cannot be efficiently cooled because the permanent magnet and the air flow are not in direct contact with each other.

  The present invention has been made to solve the above-described problems. A rotor capable of efficiently cooling a permanent magnet, a rotating electric machine including the rotor, an electric compressor using the rotating electric machine, and the electric motor An object of the present invention is to provide a refrigeration air conditioner equipped with a compressor.

  The rotor according to the present invention includes a rotor core formed by laminating a plurality of iron core plates having a shape n times symmetrical with respect to a rotation axis so as to correspond to the number of magnetic poles in the rotation axis direction, and the rotation A permanent magnet embedded in the permanent magnet insertion hole provided on the outer peripheral side of the core of the core so as to have a gap in the radial direction; and end plates provided respectively at both ends of the rotor core in the rotational axis direction; The end plate includes a fluid suction hole provided to communicate with the permanent magnet insertion hole, and one portion divided into n equal parts for each magnetic pole by the iron core plate further includes the rotor core. A plurality of connections that connect the inner peripheral side core portion and the outer peripheral side core portion, the outer peripheral side core portion positioned on the outer peripheral side of the rotor core, and the outer peripheral side core portion. Between the inner peripheral portion and the inner peripheral side core portion and the outer peripheral side core portion via the connecting portion. At least one of a plurality of magnet insertion hole openings provided to form the permanent magnet insertion holes when the iron core plates are laminated, and at least one of the magnet insertion hole openings, A fluid discharge path communicating with the outside on the outer peripheral side of the rotor core.

  According to the rotor according to the present invention, the permanent magnet embedded in the rotor can be efficiently cooled and the demagnetization resistance can be improved.

It is sectional drawing which shows the longitudinal cross-section structure of the rotor of the rotary electric machine in Embodiment 1 of this invention. It is a perspective view which shows the principal part of the rotor of the rotary electric machine in Embodiment 1 of this invention. It is a top view which shows the end plate provided in the both ends of the rotor core in Embodiment 1 of this invention. It is a top view which shows the iron core board which comprises the rotor iron core in Embodiment 1 of this invention. It is the fragmentary top view which expanded and showed a part of iron core board in Embodiment 1 of this invention. It is an enlarged plan view which shows the structure of the intermediate | middle connection part periphery of the iron core board in Embodiment 1 of this invention. It is the fragmentary top view which expanded and showed a part of iron core board which comprises the rotor core of the rotor of the rotary electric machine in Embodiment 2 of this invention. It is a top view which shows the end plate of the rotor of the rotary electric machine in Embodiment 2 of this invention. It is the fragmentary top view which expanded and showed a part of iron core board which comprises the rotor core of the rotor of the rotary electric machine in Embodiment 3 of this invention. It is the fragmentary top view which expanded and showed a part of iron core board which comprises the rotor core of the rotor of the rotary electric machine in Embodiment 4 of this invention. It is a perspective view which shows the principal part of the rotor of the rotary electric machine in Embodiment 5 of this invention. It is a top view which shows the iron core board which comprises the rotor iron core in Embodiment 5 of this invention. It is the partial projection figure which expanded and showed the magnetic pole for 1 pole of the rotor in Embodiment 5 of this invention. It is a top view which shows the iron core board which comprises the rotor iron core of the rotor of the rotary electric machine in Embodiment 6 of this invention. It is the partial projection figure which expanded and showed the magnetic pole for 1 pole of the rotor in Embodiment 6 of this invention. It is the fragmentary top view which expanded and showed a part of iron core board which comprises the rotor core of the rotor of the rotary electric machine in Embodiment 7 of this invention. It is sectional drawing which shows the longitudinal cross-section structure of the rotor core from which the combination of the iron core board in Embodiment 7 of this invention differs. It is the fragmentary top view which expanded and showed a part of iron core board which comprises the rotor core of the rotor of the rotary electric machine in Embodiment 8 of this invention. It is sectional drawing which shows the longitudinal cross-section structure of the electric compressor in Embodiment 9 of this invention. It is a refrigerant circuit figure which shows the refrigerating cycle of the air conditioning apparatus in Embodiment 10 of this invention. It is a disassembled perspective view which shows the outdoor unit of the separate type air conditioning apparatus in Embodiment 10 of this invention.

Embodiment 1 FIG.
First, the structure of the rotor of the rotary electric machine in Embodiment 1 of this invention is demonstrated. 1 is a cross-sectional view showing a longitudinal cross-sectional configuration of a rotor of a rotating electrical machine according to Embodiment 1 of the present invention. The rotary electric machine shown in Embodiment 1 of the present invention is a rotary electric machine used for an electric compressor of a refrigeration air conditioner that uses a refrigeration cycle such as an air conditioner or a refrigeration apparatus.

  As shown in FIG. 1, a rotor 60 of a rotating electrical machine has a rotor core 20 formed by stacking a plurality of iron core plates formed of electromagnetic steel plates, and a magnet insertion hole 9 formed in the rotor core 20. The permanent magnet 10 is disposed, and end plates 21 are provided at both ends of the rotor core 20. Further, a rotor 60 of a rotating electrical machine used for an electric compressor includes a semicircular balance weight 23 that maintains a balance during rotation on the outside of one end plate 21. The rotor core 20, end plates 21 and balance weights 23 arranged at both ends thereof are integrally fixed by rivets 24 to constitute a rotor 60. Further, a shaft insertion hole 4 is provided inside the rotor core 20 and the end plate 21 for passing a shaft serving as a rotation axis indicated by a one-dot chain line PQ. In the above configuration, the balance weight 23 is not always necessary, and the rotor 60 having a configuration without the balance weight 23 may be used.

  The rotating electric machine is configured by arranging a stator having a coil around the cylindrical rotor thus configured. The rotor can be rotated around the rotation axis by supplying current to the stator coil.

  In the rotor 60, the laminated iron core plate and the end plate 21 are fixed by the rivets 24, so that the permanent magnet 10 is disposed in the magnet insertion hole 9 so as to have a gap d around it. This gap d is a gap necessary for inserting the permanent magnet 10 into the magnet insertion hole 9. The distance of the gap d can be controlled within the range of manufacturing tolerances. For example, the distance of the gap d is preferably approximately 2 to 8% of the thickness of the plate-like permanent magnet 10, such as a rotating electric machine for a refrigeration air conditioner. When the thickness of the permanent magnet 10 is 3 to 4 mm, about 0.1 to 0.3 mm is preferable. When the rotating electrical machine is used in an electric compressor of a refrigeration air conditioner, the periphery of the rotor 60 is filled with a gaseous refrigerant. Therefore, a gaseous refrigerant enters the gap d around the permanent magnet 10. The permanent magnet 10 may be, for example, a plate-like rare earth magnet mainly composed of neodymium, iron, or boron, or a ferrite magnet mainly composed of iron oxide. Further, an airtight member (not shown) such as a resin may be provided between the permanent magnet 10 and the end plate 21 to close the gap between the permanent magnet 10 and the end plate 21.

The refrigerant does not constitute a part of the present invention. The above-described refrigerant is a refrigerant used in a refrigeration cycle such as hydrofluorocarbon (HFC), hydrochlorofluorocarbon (HCFC), or carbon dioxide (CO ₂ ). Therefore, when the rotating electrical machine is used for applications other than the refrigeration air conditioner, for example, a motor generator of an electric vehicle, other gases such as air may be used instead of the refrigerant described here. Moreover, it is not limited to gas but may be liquid. That is, in applications other than the refrigerating and air-conditioning apparatus, fluid such as gas or liquid may be used instead of the refrigerant described here.

  FIG. 2 is a perspective view showing the main part of the rotor of the rotating electrical machine according to Embodiment 1 of the present invention shown in FIG. FIG. 3 is a plan view showing end plates provided at both ends of the rotor core, and FIG. 4 is a plan view showing iron core plates constituting the rotor core. 5 is a partial plan view showing a part of the iron core plate shown in FIG. 4 in an enlarged manner. In FIG. 5, a partial planar shape obtained by enlarging a part of the end plate when a rotor is configured by combining a plurality of iron core plates and end plates as shown in FIG. The permanent magnets arranged in the magnet insertion holes are also shown.

  As shown in FIG. 2, a rotor 60 of a rotating electrical machine forms a rotor core 20 by laminating a plurality of iron core plates 1 obtained by stamping and forming electromagnetic steel sheets having a thickness of 0.1 to 1 mm to form a rotor core 20. End plates 21 are provided at both ends of 20. Therefore, the cross-sectional shape cut by a plane orthogonal to the rotation axis of the rotor core 20 is the same as that of the iron core plate 1, and in the following description, the rotor core 20 will be described to show the structure of the iron core plate 1. The same reference numerals as those described above may be used for explanation.

  As shown in FIG. 3, the end plate 21 is provided with a refrigerant suction hole 22. As shown in FIGS. 4 and 5, the iron core plate 1 has a first magnet insertion hole 9 a and a second magnet insertion hole 9 b, and the rotor 60 is obtained by stacking a plurality of iron core plates 1. Magnet insertion holes 9a and 9b having a depth in the rotation axis direction are formed. Plate-like permanent magnets 10a and 10b are inserted into magnet insertion holes 9a and 9b formed by laminating a plurality of iron core plates 1, so that the permanent magnets 10a and 10b do not jump out of the rotor 60 during rotation. Further, end plates 21 are provided at both ends of the rotor core 20. Between the permanent magnets 10a and 10b and the walls of the magnet insertion holes 9a and 9b formed by the plurality of iron core plates 1, a gap d having a distance of 2 to 8% of the thickness of the permanent magnets 10a and 10b is provided. Have. The end plates 21 are provided at both ends of the rotor core 20 so that the refrigerant suction holes 22 communicate with the magnet insertion holes 9 b of the rotor core 20. However, the refrigerant suction hole 22 may be provided only in one of the end plates 21.

  Next, the structure of the iron core plate 1 will be described with reference to FIGS. As shown in FIG. 4, when the number of magnetic poles is n poles (n is an even number equal to or greater than 2), the iron core plate 1 has an n-order rotationally symmetric shape. Since FIG. 4 shows a case where the number of magnetic poles is six, the shape is six-fold symmetric. However, the present invention does not limit the number of magnetic poles to six, and the number of magnetic poles is four or eight. May be the number of poles.

  When the six-pole iron core plate 1 shown in FIG. 4 is divided into six equal parts by a one-dot chain line AB, a one-dot chain line CD, and a one-dot chain line EF passing through the center of the iron core 1, It becomes the same shape. Therefore, in the following, the partial shape for one pole of the iron core plate 1 divided equally by the number of magnetic poles 6 will be described. However, the partial shape for one pole described below is 0 °, 60 °, 120 °, 180 °. If the six partial shapes rotated by 240 ° and 300 ° are added together, the overall shape of the iron core plate is obtained. The same applies to the case where the number of magnetic poles is other than 6, and the iron core plate 1 has a rotationally symmetric shape.

  FIG. 5 shows the iron core plate 1 in the upper part of the drawing, which is sandwiched between the alternate long and short dash line AB and the alternate long and short dash line CD shown in FIG. In FIG. 5, the shaft insertion hole 4 is omitted. The iron core plate 1 includes a first permanent magnet 10a inserted into the first magnet insertion hole 9a and a second permanent magnet 10b inserted into the second magnet insertion hole 9b. Are arranged so as to be line-symmetric with respect to the polar axis of the magnetic pole shown in FIG. As shown in FIG. 5, the first and second permanent magnets 10a and 10b are inserted into the first and second magnet insertion holes 9a and 9b to form one magnetic pole. That is, the first and second permanent magnets 10a and 10b are both the south pole when the upper side of the paper is the north pole, or the lower side of the paper is the north pole when the upper side of the paper is the south pole. . In general, the magnetic pole indicates a state in which a permanent magnet is provided. However, in the embodiment of the present invention, no permanent magnet is provided, and the first and second magnet insertion holes 9a and 9b are provided. Is also called a magnetic pole for convenience.

  As shown in FIG. 5, the inner peripheral side iron core portion 2 is provided on the inner peripheral side (the lower side in the drawing) of the magnetic pole formed of the first and second magnet insertion holes 9a and 9b. The outer peripheral side iron core portion 3 is provided (on the upper side of the drawing). The inner periphery side iron core portion 2 and the outer periphery side iron core portion 3 include an intermediate connecting portion 5 provided between one end of the first magnet insertion hole 9a and one end of the second magnet insertion hole 9b, The magnet insertion holes 9a are connected to each other through two connecting portions with an end connecting portion 6 provided on the other end side.

  As shown in FIG. 5, the other end of the first magnet insertion hole 9a on the side not in contact with the intermediate coupling portion 5 communicates with the first gap portion 7a provided to reduce the leakage magnetic flux, The end side connection part 6 is comprised by two area | regions of the radial direction connection part 6a and the outer periphery connection part 6b so that the outer side of the 1st space | gap part 7a may be enclosed. On the other hand, the other end of the second magnet insertion hole 9b on the side not in contact with the intermediate coupling portion 5 is also in communication with the second gap portion 7b for reducing the leakage magnetic flux. A refrigerant discharge path 8 is provided between the second gap 7 b and the outer diameter outside of the iron core plate 1, and the second gap 7 b communicates with the outside on the outer peripheral side of the iron core 1. Moreover, the outer periphery connection part 6c is formed so that a part of the outer side of the 2nd space | gap part 7b may be enclosed. The outer peripheral connecting part 6c does not connect the inner peripheral side iron core part 2 and the outer peripheral side iron core part 3, but the shape of the iron core plate 1 approaches line symmetry with respect to the polar axis of the magnetic pole indicated by the alternate long and short dash line RS. Thus, it is provided corresponding to the outer periphery connection part 6b. When the refrigerant discharge path 8 is provided in the iron core plate 1, the shape of the rotor iron core 20 becomes asymmetric with respect to the pole axis of the magnetic pole, so that it is generated in the stator coil when the rotor 60 of the rotating electrical machine is rotated. The induced voltage waveform to be distorted causes noise. However, if the outer peripheral connecting portion 6c is provided as described above so that the shape of the iron core plate 1 approaches line symmetry with respect to the polar axis of the magnetic pole, distortion of the induced voltage waveform generated in the stator coil is reduced and noise is reduced. Occurrence can be suppressed.

  The inner periphery side iron core part 2 and the outer periphery side iron core part 3 are provided with recesses 11 a and 11 b and recesses 12 a and 12 b at the connection part with the intermediate connection part 5. Therefore, the end portions of the first magnet insertion hole 9a and the second magnet insertion hole 9b that are in contact with the intermediate connecting portion 5 are wider in the magnet insertion holes 9a and 9b than the other portions, and the permanent magnet 10a. 10b and the core plate 1 are formed with spaces by the recesses 11a, 11b, 12a, 12b.

  6 is an enlarged plan view showing the structure around the intermediate connecting portion of the iron core plate of the first embodiment shown in FIG. As shown in FIG. 6, the shape of the recesses 11a, 11b, 12a, and 12b is formed so as to be an elliptical arc 13 having a long axis in the radial direction of the iron core plate 1, that is, the polar axis of the magnetic pole indicated by the alternate long and short dash line RS. ing. When the rotor 60 rotates, a centrifugal force acts on the outer peripheral side iron core portion 3 and the permanent magnets 10a and 10b. As a result, tension is applied to the intermediate connecting portion 5, but the recesses 11a, 11b, 12a and 12b By forming the shape with an elliptical arc, the stress generated at the joint between the straight portion and the curved portion of the intermediate connecting portion 5 can be relaxed. As a result, it is possible to reduce the leakage magnetic flux by narrowing the width of the intermediate connecting portion 5. The recesses 11a, 11b, 12a, and 12b may be formed by smoothly connecting a plurality of arcs instead of the elliptical arc 13.

  The rotor core 20 is formed by laminating a plurality of the iron core plates 1 having the above shapes, and after inserting the permanent magnets 10a and 10b into the magnet insertion holes 9a and 9b, end plates 21 are provided at both ends of the rotor core 20. The rotor shown in FIG. 2 is configured. As shown in FIG. 5, the end plate 21 is formed with the refrigerant suction holes 22 at positions communicating with the recesses 11a, 11b, 12a, 12b of the iron core plate 1, so that the recesses 11a, 11b, 12a, 12 b is spatially connected to the outside of the rotor 60 through the refrigerant suction hole 22.

  Next, the operation of the rotor 60 according to the first embodiment of the present invention will be described. When the rotor 60 is rotated, since the refrigerant discharge path 8 communicates with the outside of the rotor core 20, the refrigerant in the refrigerant discharge path 8 is discharged to the outside of the rotor core 20 by centrifugal force, and the refrigerant is discharged. The inside of the path 8 is a negative pressure. As a result, the refrigerant outside the rotor 60 is sucked from the refrigerant suction hole 22 of the end plate 21, and the sucked refrigerant passes through the recesses 11b and 12b provided at the end of the magnet insertion hole 9b, and the permanent magnet 10b. The refrigerant flows into the refrigerant discharge path 8 communicating with the magnet insertion hole 9b through the peripheral gap d, and is discharged from the refrigerant discharge path 8 to the outside of the rotor 60. The permanent magnet 10b is cooled by the flow of the refrigerant passing around the permanent magnet 10b.

  As shown in FIG. 5, since the permanent magnet 10b is behind the permanent magnet 10a in the rotational direction, the permanent magnet 10a is more susceptible to a demagnetizing field from the stator than the permanent magnet 10a. It is determined not by the permanent magnet 10a but by the permanent magnet 10b. Therefore, by providing the refrigerant discharge path 8 so as to cool the permanent magnet 10b located on the rear side in the rotation direction, the permanent magnet 10b can be efficiently cooled. As a result, the demagnetization resistance of the rotor 60 is improved and fixed. The magnetic flux density generated by the child can be increased, and as a result, the torque can be improved without increasing the size of the rotor 60.

  In the rotor 60 of the first embodiment, since the refrigerant hardly flows around the permanent magnet 10a, the refrigerant suction hole 22 provided in the end plate 21 has recesses 11a, 11b, 12a as shown in FIG. , 12b do not necessarily correspond to each other, and may be formed so as to communicate only with the recess 11b and the recess 12b.

Embodiment 2. FIG.
FIG. 7 is an enlarged partial plan view showing a part of an iron core plate constituting a rotor iron core of the rotor of the rotating electrical machine according to the second embodiment of the present invention. FIG. 8 is a plan view showing an end plate of the rotor of the rotating electric machine according to the second embodiment of the present invention. In FIG. 7, similarly to FIG. 5 of the first embodiment, a partial planar shape obtained by enlarging a part of the end plate when a rotor is configured by combining a plurality of iron core plates and end plates is indicated by a broken line. did. 7 and 8, the same reference numerals as those in FIGS. 5 and 3 of the first embodiment denote the same or corresponding components, and the description thereof is omitted. Although the shape of the iron core board 1 is the same as Embodiment 1 of this invention, the structure which added the refrigerant | coolant suction hole further to the end plate 21 is different.

  As shown in FIGS. 7 and 8, the end plate 21 of the rotor 60 of the second embodiment has a first refrigerant suction hole 22a that communicates with the recesses 11a, 11b, 12a, and 12b that are in contact with the intermediate connecting portion 5. In addition, a second refrigerant suction hole 22b communicating with the second gap 7b communicating with the second magnet insertion hole 9b is formed. The second refrigerant suction hole 22b on the left side of FIG. 7 does not correspond to the first gap 7a of the magnetic pole shown in FIG. 7, but the magnetic pole on the left side of the magnetic pole shown in FIG. This corresponds to the second gap 7b. Therefore, in FIG. 7, the second refrigerant suction hole 22b is formed in the end plate 21 so as to communicate with both the first gap portion 7a and the second gap portion 7b. May be formed on the end plate 21 so as to be shifted in the rotational direction, and communicated only with the second gap 7b.

  As described above, when the refrigerant suction hole 22b communicating with the second gap 7b is provided in the end plate 21 in addition to the refrigerant suction hole 22a, the refrigerant flowing in from the refrigerant suction hole 22b has a low flow resistance. Since it is discharged | emitted from the refrigerant | coolant discharge path 8 through the space | gap part 7b, the refrigerant | coolant amount which passes along the 2nd space | gap part 7b increases. As a result, the end of the permanent magnet 10b on the rear side in the rotational direction that is particularly susceptible to demagnetization is efficiently cooled by a large amount of refrigerant passing through the second gap 7b, and the thermal demagnetization resistance can be further improved. The effect that the torque can be improved without increasing the size of the rotor 60 is obtained.

  If it is desired to cool only the end portion of the permanent magnet 10b, both the refrigerant suction holes 22a and 22b are not necessarily provided in the end plate 21, and only the refrigerant suction hole 22b may be provided.

Embodiment 3 FIG.
FIG. 9 is an enlarged partial plan view showing a part of the iron core plate constituting the rotor iron core of the rotor of the rotating electrical machine according to the third embodiment of the present invention. In FIG. 9, as in FIG. 5 of the first embodiment, a partial planar shape obtained by enlarging a part of the end plate when a rotor is configured by combining a plurality of iron core plates and end plates is indicated by a broken line. did. 9, the same reference numerals as those in FIG. 5 of the first embodiment denote the same or corresponding components, and the description thereof is omitted. The position of the intermediate connecting portion 5 of the iron core plate 1 and the position of the refrigerant suction hole 22 of the end plate 21 corresponding thereto are different from those of the first embodiment of the present invention.

  As shown in FIG. 9, the iron core plate 1 of the rotor 60 according to the third embodiment of the present invention has an opening distance along the rotation direction of the second magnet insertion hole 9b on the rear side in the rotation direction. Is shorter than the first magnet insertion hole 9a, which is the front side. That is, the intermediate connecting portion 5 and the concave portions 11a, 11b, 12a, and 12b that are in contact with the intermediate connecting portion 5 are formed so as to be shifted rearward in the rotational direction from the polar axis of the magnetic pole indicated by the alternate long and short dash line RS. Accordingly, the refrigerant suction hole 22 formed in the end plate 21 is also formed so as to be shifted to the rear side in the rotation direction from the pole axis of the magnetic pole.

  In this way, the intermediate connecting portion 5 of the iron core plate 1 and the recesses 11a, 11b, 12a, 12b in contact with the intermediate connecting portion 5 and the refrigerant suction hole 22 of the end plate 22 are formed on the rear side in the rotation direction from the pole axis of the magnetic pole. Thus, the distance d of the gap d through which the refrigerant flows between the second magnet insertion hole 9b and the second permanent magnet 10b can be shortened. As a result, the flow resistance of the refrigerant flow path formed by the gap d around the second permanent magnet 10b can be reduced, so that the amount of refrigerant flowing in the gap d around the second permanent magnet 10b is increased. Can do. That is, the demagnetization proof strength of the rotor 60 is determined by the temperature around the end of the second permanent magnet 10b on the rear side in the rotational direction. Therefore, the configuration of the third embodiment allows the second permanent magnet 10b to be It is possible to improve the demagnetization resistance by cooling more efficiently. As a result, a further effect of reducing thermal demagnetization can be obtained, so that the torque can be improved without increasing the size of the rotor 60.

Embodiment 4 FIG.
FIG. 10 is an enlarged partial plan view showing a part of the iron core plate constituting the rotor iron core of the rotor of the rotating electric machine according to the fourth embodiment of the present invention. 10, the same reference numerals as those in FIG. 5 of the first embodiment denote the same or corresponding components, and the description thereof is omitted. The first embodiment of the present invention is different from the first embodiment in that the intermediate connecting portion 5 of the iron core plate 1 is inclined with respect to the polar axis.

  As shown in FIG. 10, the iron core plate of the rotor of the rotating electric machine according to the fourth embodiment has an intermediate connecting portion 5 formed between the first magnet insertion hole 9a and the second magnet insertion hole 9b. , And is formed to be inclined in the rotational direction with respect to the polar axis of the magnetic pole indicated by the alternate long and short dash line RS. In FIG. 10, the center line of the intermediate connecting portion 5 is indicated by a one-dot chain line GH, and the inclination angle with respect to the one-dot chain line RS that is the polar axis is indicated by θ.

  When the rotor 60 rotates, centrifugal force acts on the outer peripheral side iron core portion 3 and the permanent magnets 10a and 10b. The centrifugal force occupies most of the radial component of the rotor 60, but by forming the refrigerant discharge path 8 on the rear side in the rotational direction, the end side connecting portion 6 formed on the front side in the rotational direction is used as a fulcrum. Thus, the outer peripheral side iron core portion 3 receives a force that opens outward in the radial direction. For this reason, the intermediate connection part 5 deform | transforms minutely within the range of elastic deformation. Therefore, by inclining the intermediate connecting part 5 at an angle θ in the rotation direction, the direction of the stress applied to the intermediate connecting part 5 is made closer to the direction of the intermediate connecting part 5 to reduce the bending stress acting on the intermediate connecting part 5. Is possible. As a result, the width of the intermediate coupling portion 5 can be reduced, and the permanent magnet 10b can be efficiently cooled while reducing the leakage magnetic flux of the permanent magnets 10a and 10b generated by passing through the intermediate coupling portion 5. .

  In addition, as for inclination-angle (theta) of the intermediate connection part 5, the range of 1 degree-5 degrees is desirable. The accuracy of punching by pressing of the iron core plate 1 is about ± 25 μm. If an inclination angle is specified to be less than 1 °, it is difficult to manufacture the iron core plate 1 by punching by pressing. The manufacturing cost of the rotor 60 increases because it must be manufactured by a highly accurate processing process. On the other hand, when the inclination angle is larger than 5 °, the distance between the permanent magnet 10a and the permanent magnet 10b is widened, and the effective length of the magnetic pole is reduced accordingly, so that the magnetic flux generated by the magnetic pole is reduced and the efficiency is lowered. . In order to reduce the reduction rate of the magnetic flux generated by the magnetic pole to 1% or less, the tilt angle θ needs to be 5 ° or less. Therefore, the inclination angle θ of the intermediate connecting portion 5 is desirably in the range of 1 ° to 5 °.

  FIG. 10 shows the case where the intermediate connecting portion 5 is formed at the center of the magnetic pole, that is, at the position of the polar axis RS indicated by the one-dot chain line, but as shown in the third embodiment, You may form in the position which shifted | deviated from the center, for example, the position shifted | deviated to the back side of the rotation direction.

Embodiment 5. FIG.
FIG. 11 is a perspective view showing a main part of the rotor of the rotating electrical machine according to the fifth embodiment of the present invention. In FIG. 11, the same reference numerals as those in FIG. 2 of the first embodiment denote the same or corresponding components, and the description thereof is omitted. The laminated structure of the iron core plate 1 for forming the rotor iron core 20 is different from the first embodiment and the third embodiment of the present invention.

  As shown in FIG. 11, the rotor 60 of the rotating electric machine according to the fifth embodiment of the present invention includes the rotor core 20 by stacking the partial rotor cores 201, 202, 203 in the rotation axis direction. End plates 21 are provided at both ends. The partial rotor cores 201 and 203 are formed by laminating a plurality of identical core plates 1b. Note that the number of laminated core plates 1b may be the same or different between the partial rotor cores 201 and 203. The partial rotor core 202 is formed by laminating a plurality of core plates 1a in which the core plates 1b of the partial rotor cores 201 and 203 are reversed. Similarly to the partial rotor cores 201 and 203, a partial rotor core may be formed by stacking a plurality of iron core plates 1b, and the partial rotor core 202 may be turned upside down. The number of stacked core plates 1a in the partial rotor core 202 may be the same as or different from the partial rotor core 201 or 203. Further, the number of the partial rotor cores constituting the rotor core 20 is not limited to 3, and may be 2 or 4 or more. Furthermore, the number of core plates forming the partially rotating iron core is not limited to a plurality, and may be one. That is, the rotor core 20 may be configured by alternately laminating the iron core plate 1a and the iron core plate 1b in which the iron core plate 1a is turned upside down.

  FIG. 12 is a plan view showing an iron core plate constituting the rotor iron core according to the fifth embodiment of the present invention. 12 is a plan view of the iron core plate 1a forming the partial rotor core 202 and the iron core plate 1b forming the partial rotor cores 201 and 203 of the rotor 60 shown in FIG. An iron core plate 1b shown in FIG. 12B is obtained by inverting the iron core plate 1a shown in FIG. 12 (a) is the same as the iron core plate 1 shown in FIG. 9 of the third embodiment. Note that the shape of the iron core plate is not limited to that shown in FIG. 12, and for example, the iron core plate having the shape shown in FIG. . In FIG. 12, the reference numerals of the first magnet insertion hole 9a and the second magnet insertion hole 9b are the same as the corresponding ones even if they are reversed, but in other reference numerals, FIG. ) Is a suffix a, and FIG. 12B is a suffix b.

  FIG. 13 is an enlarged partial projection view showing one magnetic pole of the rotor shown in FIG. That is, FIG. 13 is an enlarged view of one pole when the core plates 1a and 1b and the end plate 21 shown in FIGS. 12A and 12B are overlapped and projected in the direction of the rotation axis of the rotor 60. It is shown. In FIG. 13, the permanent magnets 10a, 10b, and 10c are shown together, and the end plate 21 is shown by a broken line. As shown in FIG. 11, the end plate 21 of the rotor 60 is provided with two refrigerant suction holes 22a and 22b for one magnetic pole.

  As shown in FIG. 13, the partial rotor core 202 (refer FIG. 11) which laminated | stacked the iron core board 1a (refer FIG. 12 (a)), and the partial rotor which laminated | stacked the iron core board 1b (refer FIG.12 (b)). By superimposing the iron cores 201 and 203 (see FIG. 11), the refrigerant discharge paths 8a and 8b can be formed on both the rear side and the front side in the rotation direction. Further, the magnetic pole is divided into three by the intermediate connecting portions 5a and 5b, and magnet insertion holes 9c, 9d and 9e are formed. The magnet insertion hole 9c is formed by the first magnet insertion hole 9a of the iron core plate 1a and the second magnet insertion hole 9b of the iron core plate 1b. The magnet insertion hole 9d is formed by the first magnet insertion hole 9a of the iron core plate 1a and the first magnet insertion hole 9a of the iron core plate 1b. The magnet insertion hole 9e is formed by the second magnet insertion hole 9b of the iron core plate 1a and the first magnet insertion hole 9a of the iron core plate 1b. The permanent magnets 10c, 10d, and 10e are inserted into the magnet insertion holes 9c, 9d, and 9e formed as described above, and the magnetic pole of the rotor 60 is formed.

  As described above, since the magnet insertion hole 9d is formed by the first magnet insertion hole 9a of the iron core plate 1a and the second magnet insertion hole 9a of the iron core plate 1b, the magnet insertion holes 9c, 9d and 9e are mutually connected. It is connected spatially. Therefore, when the rotor rotates and the refrigerant is sucked from at least one of the refrigerant suction hole 22a or the refrigerant suction hole 22b, the refrigerant passes through the gap d around the permanent magnets 10c, 10d, and 10e that are spatially connected. It flows through and is discharged out of the rotor from the refrigerant discharge paths 8a and 8b. As a result, the permanent magnets 10c, 10d, and 10e can be cooled, and an effect that the demagnetization resistance can be improved is obtained.

  Further, as described in the fifth embodiment, by forming the rotor core 20 using the iron core plate 1a shown in FIG. 12 and the iron core plate 1b reversed, the refrigerant discharge paths 8a and 8b. Therefore, the distortion of the induced voltage waveform generated in the stator coil can be further suppressed by providing the refrigerant discharge path.

  In the fifth embodiment, as shown in FIG. 13, the refrigerant suction holes 22a and 22b of the end plate 21 are provided at positions corresponding to the intermediate connecting portions 5a and 5b, but as shown in the second embodiment, A refrigerant suction hole may be additionally provided at positions corresponding to the gaps 7c and 7d provided at both ends of the magnetic pole. As a result, it is possible to increase the cooling effect of the end portions of the permanent magnets 10a and 10b in contact with the gap portions 7c and 7d, and to further improve the demagnetization resistance.

Embodiment 6 FIG.
FIG. 14 is a plan view showing an iron core plate constituting the rotor core among the rotors of the rotating electric machine according to the sixth embodiment of the present invention. FIG. 15 is an enlarged partial projection showing one pole of the rotor formed by the iron core plate of FIG. That is, FIG. 15 is an enlarged view of one pole when the core plates 1a and 1b and the end plate 21 shown in FIGS. 14A and 14B are overlapped and projected in the direction of the rotation axis of the rotor 60. It is shown. In FIG. 15, the end plate 21 is indicated by a broken line. 14 and 15, the same reference numerals as those in FIGS. 12 and 13 of the fifth embodiment denote the same or corresponding components, and the description thereof is omitted. The shape of the iron core plate for forming the rotor core and the shape of the end plates provided at both ends of the rotor core are different from the fifth embodiment of the present invention.

  The rotor 60 of the rotating electrical machine according to the sixth embodiment of the present invention includes a partial rotor core formed by stacking a plurality of iron core plates 1a having the shape shown in FIG. 14 (a), and as shown in FIG. 14 (b). Further, as described in the fifth embodiment, a plurality of partial rotor cores formed by laminating a plurality of iron core plates 1b with the iron core plates 1a turned upside down are stacked. Therefore, in the sixth embodiment, differences from the fifth embodiment will be described, and a method for forming a partial rotor core and a method for forming a rotor core by stacking a plurality of partial rotary cores are described in the embodiment. Since it is the same as 5, the description is omitted.

  As shown in FIGS. 14A and 14B, the iron core plates 1a and 1b of the sixth embodiment are connected to the first magnet insertion hole 9a, and the refrigerant passage hole 14 is formed on the inner peripheral side. ing. The refrigerant passage hole 14 is formed on the polar axis of each magnetic pole passing through the centers of the iron core plates 1a and 1b shown by the one-dot chain line in FIG. Therefore, the position of the refrigerant passage hole 14 does not change even when the iron core plate 1a is turned upside down to form the iron core slope 1b.

  A predetermined number of partial rotor cores in which a plurality of core hills 1a formed in this way are stacked and a partial rotor core in which a plurality of core plates 1b with the core plate 1a as front and back frames are stacked are alternately stacked. When the rotor core is formed and the end plates 21 are provided at both ends of the rotor core, the rotor 60 having the configuration as shown in the partial plan view of FIG. 15 is formed. In FIG. 15, the end plate 21 and the refrigerant suction hole 22 formed in the end plate 21 are indicated by broken lines. As described in the fifth embodiment, magnet insertion holes 9c, 9d, and 9e are formed in the rotor core 20, and permanent magnets are inserted into the respective magnet insertion holes. The magnet insertion hole 9d is formed by the first magnet insertion hole 9a of the iron core plate 1a and the first magnet insertion hole 9a of the iron core plate 1b. The magnet insertion holes 9c, 9d, and 9e are respectively iron core plates 1a. The first magnet insertion holes 9a of 1b are connected spatially. Therefore, since the refrigerant passage hole 14 is formed to be connected to the first magnet insertion hole 9a, the refrigerant passage hole 14 communicates with the magnet insertion holes 9c, 9d, 9e, and the refrigerant discharge passages 8a, 8b. It communicates with.

  When the rotor 60 configured in this way rotates, the refrigerant flows in from the refrigerant suction holes 22 of the end plates 21 provided at both ends of the rotor 60, and the refrigerant passes through the refrigerant passage holes 14 and passes through the magnet insertion holes 9c. , 9d, 9e and the permanent magnets inserted into these magnet insertion holes, and flows through the gaps between the refrigerant discharge paths 8a, 8b to the outside of the rotor. Thereby, the effect that the permanent magnet inserted in magnet insertion hole 9c, 9d, 9e can be cooled, and a demagnetization proof stress can be improved is acquired.

  Further, in the sixth embodiment of the present invention, since the coolant passage hole 14 is formed at a position away from the first magnet insertion hole 9a of the iron core plates 1a and 1b, the coolant suction hole 22 of the end plate 21 is formed. Is also formed at a position away from the magnet insertion hole, and it is possible to obtain an effect that it is possible to prevent the permanent magnet from being exposed and damaged from the refrigerant suction hole 22 of the end plate 21.

  In the sixth embodiment, the case where the refrigerant passage hole 14 is formed in the inner peripheral side iron core portion 2 has been described, but the refrigerant passage hole 14 may be formed in the outer peripheral side iron core portion 3.

Embodiment 7 FIG.
FIG. 16 is a partial plan view showing, in an enlarged manner, a part of the iron core plate constituting the rotor iron core in the rotor of the rotating electric machine according to the seventh embodiment of the present invention. In FIG. 16, as in FIG. 9 of the third embodiment, a partial planar shape obtained by enlarging a part of the end plate when a rotor is configured by combining a plurality of iron core plates and end plates is indicated by a broken line. did. In FIG. 16, the same reference numerals as those in FIG. 9 of the third embodiment denote the same or corresponding components, and the description thereof is omitted. The third embodiment is different from the third embodiment in that the radial width of the second magnet insertion hole is increased.

As shown in FIG. 16, in the iron core plate 1 of the seventh embodiment, the radial width D2 of the _second magnet insertion hole 9b connected to the refrigerant discharge path 8 is the same as that of the first magnet insertion hole 9a. It has become width _{D 1} large. The radial width D1 of the _first magnet insertion hole 9a may be the same as, for example, the iron core plate 1 shown in FIG. 9 of the third embodiment, and the permanent magnet inserted into the magnet insertion holes 9a and 9b. The width in the radial direction may be the same as that shown in the third embodiment.

That is, the iron core plate 1 shown in FIG. 9 of the seventh embodiment has a larger radial width D2 of the _second magnet insertion hole 9b than the iron core plate 1 shown in FIG. 9 of the third embodiment. Is different. Width _{D 2} in FIG. 9 than the width _{D 1,} for example, is larger 0.1 to 0.2 mm. Thus, by increasing the radial width D2 of the _second magnet insertion hole 9b, the gap d around the permanent magnet 10b inserted into the second magnet insertion hole 9b is increased, and the flow path resistance is increased. The amount of refrigerant flowing around the permanent magnet 10b can be increased, and the cooling effect of the permanent magnet 10b can be enhanced. However, too large a width D _2, but the flow path resistance Dekiru further small, a magnetic resistance increases due to the gap d between the permanent magnet 10b and the core plate 1, leads to a decrease of the torque because the magnetic flux is reduced. Therefore, in order to enhance the cooling effect by increasing the amount of refrigerant without greatly reducing the magnetic flux, the width D2 of the _second magnet insertion hole 9b is 0.1 than the width D1 of the _first magnet insertion hole 9a. It is desirable to be larger by ~ 0.2 mm.

  The iron core plate 1 shown in FIG. 16 of the seventh embodiment may be formed by laminating a plurality of the iron core plates 1, but in combination with the iron core plate 1 shown in FIG. 9 of the third embodiment. A rotor core may be formed. Further, as shown in FIGS. 11 and 13 of the fifth embodiment, the rotor core is formed by combining the core plate 1 of FIGS. 16 and 9 and the opposite core plate. May be formed.

  FIG. 17 is a cross-sectional view showing a longitudinal cross-sectional configuration of a rotor core having a different combination of iron core plates. 17, the partial rotor core 211 is an iron core formed by stacking a plurality of the iron core plates 1 shown in FIG. 16, and the partial rotor iron core 212 is a plurality of the iron core plates 1 of FIG. It is an iron core formed by stacking. Moreover, the partial rotor core 213 is an iron core formed by laminating a plurality of the core plates 1 shown in FIG. 9 of the third embodiment. In addition, it is an example of a combination of the partial rotor cores shown in FIG. 17 and is not limited to this.

In this way, even if the core plate 1 with the larger width D2 of the _second magnet insertion hole 9b shown in FIG. 16 of the seventh embodiment is provided in a part of the rotor core 20, Since the amount of the refrigerant flowing in the gap around the permanent magnet increases, the cooling efficiency of the permanent magnet can be further increased and the demagnetization resistance can be further improved.

Embodiment 8 FIG.
FIG. 18 is a partial plan view showing, in an enlarged manner, a part of an iron core plate constituting a rotor iron core in a rotor of a rotating electrical machine according to an eighth embodiment of the present invention. In FIG. 18, the same reference numerals as those in FIG. 9 of the third embodiment denote the same or corresponding components, and the description thereof is omitted. The shape of the part adjacent to the refrigerant | coolant discharge path 8 of the outer peripheral side iron core part 3 differs from Embodiment 3 of this invention.

  In the iron core plate 1 shown in FIG. 9 according to the third embodiment, the shape of the iron core plate 1 approaches the symmetry of the pole axis of the magnetic pole in order to suppress distortion of the induced voltage waveform generated in the stator coil. The outer peripheral connecting portion 6c corresponding to the outer peripheral connecting portion 6b is also provided on the side adjacent to the refrigerant discharge path 8, but the iron core plate 1 shown in FIG. 18 of the eighth embodiment is the same as that of the third embodiment. The outer peripheral connection part 6c is removed from the iron core plate 1 shown in FIG.

  As shown in FIG. 18, the iron core plate 1 of Embodiment 8 has a larger width of the refrigerant discharge path 8 than the iron core plate 1 of FIG. 9, and the second gap portion 7 b of the iron core plate 1. Since it is smoothly connected to the outside of the outer diameter, the negative pressure generated in the refrigerant discharge path 8 when the rotor rotates increases. As a result, the amount of refrigerant flowing from the refrigerant suction hole of the end plate increases, and the permanent magnet inserted into the second magnet insertion hole 9b can be more efficiently cooled.

  Moreover, since the mass of the outer peripheral side core part 3 is reduced, the centrifugal force generated in the outer peripheral side core part 3 when the rotor rotates is reduced, and the stress generated in the intermediate connection part 5 and the end side connection part 6 is reduced. can do. As a result, it is possible to obtain an effect that the width of the intermediate connecting portion 5 and the end side connecting portion 6 can be reduced to reduce the leakage magnetic flux and improve the torque of the rotating electrical machine.

  As shown in FIG. 18, the iron core plate 1 according to the eighth embodiment is not good in symmetry with respect to the polar axis of the magnetic pole indicated by the alternate long and short dash line RS as compared with the iron core plates shown in the other embodiments. . Therefore, in a rotating electrical machine using a rotor core formed by laminating a plurality of the iron core plates 1 in FIG. 18, distortion of the induced voltage waveform generated in the stator coil may increase. When such distortion of the induced voltage waveform becomes a problem, as described in the fifth and sixth embodiments, the first partial rotor core formed by stacking a plurality of the core plates 1 of FIG. If the rotor core is constructed by combining the second partial rotor core formed by stacking a plurality of core plates with the core plate 1 upside down, the shape of the rotor core becomes the polar axis of the magnetic pole. On the other hand, since the symmetry approaches, the distortion of the induced voltage waveform generated in the stator coil can be reduced.

  As described above, in the first to eighth embodiments, the case where the permanent magnets constituting the magnetic poles are arranged linearly has been described. However, the arrangement method of the permanent magnets constituting the magnetic poles is not limited to this, and the V-shape is arranged. It may be the case where it arranges in a shape, or the case where it arranges in a U shape. The number of magnetic poles is not limited to six, and may be other numbers such as four or eight.

  Further, the case where the iron core plate constituting the rotor core is circular has been described, but the shape of the iron core plate may be a rotationally symmetric shape, for example, a rotationally symmetric iron core plate having an uneven shape such as a petal shape. It may be.

  Moreover, although the case where the intermediate | middle connection part 5 which connects the inner peripheral side iron core part 2 and the outer peripheral side iron core part 3 was each provided with respect to one magnetic pole was demonstrated, the intermediate | middle connection part 5 is provided with two or more. Also good. In this case, if the inner peripheral side core part 2 and the outer peripheral side core part 3 are connected and fixed by the plurality of intermediate connecting parts 5, the end side connecting part 6 is eliminated and a new refrigerant discharge path is formed. May be.

  Further, the core plate of the rotor core is not limited to being formed by punching with a press, but may be formed by other processing methods such as cutting or wire cutting.

Embodiment 9 FIG.
Next, the electric compressor using the rotary electric machine having the rotor described in the first to eighth embodiments will be described. FIG. 19 is a sectional view showing a longitudinal sectional configuration of the electric compressor according to the ninth embodiment of the present invention. The electric compressor 100 is used for a refrigeration air conditioner using a refrigeration cycle such as a refrigeration apparatus, a refrigeration apparatus, a hot water supply apparatus, or an air conditioner. In addition, the electric compressor 100 is equipped with a rotating electrical machine including any of the rotors described in the first to eighth embodiments.

  The electric compressor 100 sucks a refrigerant that is a fluid, compresses it, and discharges it as a high-temperature and high-pressure state. The electric compressor 100 generally includes a compression mechanism 35 and a drive mechanism 36 that drives the compression mechanism 35 in a sealed casing. The casing includes an upper shell 31, a center shell 30, and a lower shell 32, and serves as a pressure vessel. As shown in FIG. 19, the compression mechanism 35 is disposed on the upper side, and the drive mechanism 36 is disposed on the lower side. The bottom of the casing is a sump for storing the refrigerating machine oil 40.

  The compression mechanism 35 has a function of compressing the refrigerant sucked from the suction pipe 33 and discharging it to the high-pressure chamber 26 formed above the casing. The refrigerant discharged into the high pressure chamber 26 is discharged from the discharge pipe 34 to the outside of the electric compressor 100. The drive mechanism 36 functions to drive the peristaltic scroll 52 constituting the compression mechanism 35 so that the compression mechanism 35 compresses the refrigerant. That is, the driving mechanism 36 drives the peristaltic scroll 52 via the shaft 56, so that the refrigerant is compressed by the compression mechanism 35.

  The compression mechanism 35 is generally configured by a fixed scroll 51, a peristaltic scroll 52, and a frame 54. As shown in FIG. 19, the peristaltic scroll 52 is arranged on the lower side, and the fixed scroll 51 is arranged on the upper side. The fixed scroll 51 includes a base plate 51a and a spiral portion 51b that is a spiral projection provided on one surface of the base plate 51a. The peristaltic scroll 52 is a base plate 52a and spiral protrusions erected on one surface of the base plate 52a. The spiral portion 51b and the spiral portion 52b mesh with each other and are mounted in the casing. And between the spiral part 52b and the spiral part 51b, the compression chamber 27 from which a volume changes relatively is formed.

  The fixed scroll 51 is fixed to the frame 54 with bolts or the like (not shown). A discharge port 53 that discharges the compressed and high-pressure refrigerant is formed in the center portion of the fixed scroll 51. The refrigerant that has been compressed to a high pressure is discharged into a high-pressure chamber 26 provided in the upper part of the fixed scroll 51. The peristaltic scroll 52 revolves around the fixed scroll 51 without rotating. A hollow cylindrical eccentric hole 52c is formed at the center of the surface (hereinafter referred to as a thrust surface) opposite to the surface where the spiral scroll 52b of the peristaltic scroll 52 is formed. In the eccentric hole 52c, an eccentric pin portion 56a provided at the upper end of the shaft 56 described later is fitted.

  The frame 54 is fixed to the inner peripheral side of the casing, and a through hole is formed in the center portion to allow the shaft 56 to pass therethrough. The frame 54 is formed with an oil return groove 61a penetrating from the thrust surface side of the peristaltic scroll 52 to the axially lower side so that the refrigerating machine oil 40 lubricated with the thrust surface is returned to the bottom of the casing. . FIG. 19 shows an example in which only one oil return groove 61a is formed, but the present invention is not limited to this. For example, two or more oil return grooves 61a may be formed. The frame 54 may be fixed to the inner peripheral surface of the casing by shrink fitting or welding.

  The drive mechanism 36 is rotatably arranged on the inner peripheral surface side of the stator 61, and is a rotor 60 (the rotor of any one of the first to eighth embodiments) fixed to the shaft 56 and vertically in the casing. The stator 61 is housed in a direction and is fixedly held, and a shaft 56 that is a rotating shaft is roughly configured. The rotor 60 is fixed to the shaft 56 and is driven to rotate when the energization of the stator 61 is started to rotate the shaft 56. Further, the outer peripheral surface of the stator 61 is instructed to be fixed to the casing (center shell 30) by shrink fitting or the like. That is, the rotor 60 and the stator 61 constitute a rotating electrical machine according to the embodiment of the present invention.

  The shaft 56 rotates with the rotation of the rotor 60 and turns the peristaltic scroll 52. The shaft 56 has a main bearing 55 located at the center of the frame 54 at its upper end and a sub-bearing 58 located at the center of the sub-frame 57 fixedly arranged below the center shell 30 to indicate that the shaft 56 can rotate. Has been. An upper end portion of the shaft 56 is formed with an eccentric pin portion 56a that is rotatably fitted in an eccentric hole 52c of the peristaltic scroll 52. In addition, an oil supply passage 56b communicating with the upper end portion is formed inside the shaft 56. The oil supply passage 56b serves as a flow path for the refrigerating machine oil 40 stored in the bottom of the casing.

  An oil pump 59 is provided at the lower end side of the shaft 56 to pump up the refrigerating machine oil 40 as the shaft 56 rotates. Due to the centrifugal pump action of the oil pump 59, the refrigeration oil 40 is pumped up, flows through the oil supply passage 56b, and is supplied to the compression mechanism 35. A suction pipe 33 for sucking refrigerant is connected to the center shell 30 constituting the casing. The suction pipe 33 is configured to open into the space in the shell (low pressure chamber 25). Further, a discharge pipe 34 for discharging the refrigerant is connected to the upper shell 31 constituting the casing. The discharge pipe 34 is configured to open to the space in the shell (the high pressure chamber 26).

  An Oldham ring (not shown) is provided between the orbiting scroll 52 and the fixed scroll 51 for preventing the orbiting scroll 52 from rotating during the eccentric orbiting motion. This Oldham ring is disposed between the orbiting scroll 52 and the fixed scroll 51, and serves to prevent the orbiting scroll 52 from rotating and to enable a revolving motion. That is, the Oldham ring functions as a rotation prevention mechanism for the swing scroll 52. In addition, the electric compressor 100 is provided with a sealing terminal 63 and a lead wire 62 for supplying power to the stator 61.

  Here, the operation of the electric compressor 100 will be briefly described.

  When the sealed terminal 63 is energized, power is supplied to the stator 61 via the lead wire 62. The rotor 60 rotates in response to a rotational force (torque) from a rotating magnetic field generated by a stator 61 to which power is supplied. Accordingly, the shaft 56 supported by the main bearing 55 and the sub bearing 58 is rotationally driven. The orbiting scroll 52 is engaged with the eccentric pin portion 56a of the shaft 56, and the rotation motion of the orbiting scroll 52 is converted into the revolution motion by the rotation prevention mechanism of the Oldham ring.

  When the rotor 60 rotates, the balance weight 23 attached to the lower surface of the rotor 60 keeps a balance with respect to the eccentric revolving motion of the orbiting scroll 52. That is, the balance weight 23 has a function of rotating together with the rotor 60 and balancing the mass with respect to this rotation. As a result, the orbiting scroll 52 supported eccentrically on the upper portion of the shaft 56 is swung to start revolving and compress the refrigerant by a known compression principle.

  First, the rotation of the shaft 56 causes the refrigerant in the casing to flow into the compression chamber 27 formed by the spiral portion 51b of the fixed scroll 51 and the spiral portion 52b of the swing scroll 52, and the suction process starts. This suction process starts when low-pressure refrigerant gas is sucked into the compression chamber 27 via the suction pipe 33 from outside through the low-pressure chamber 25.

  When the refrigerant gas is sucked into the compression chamber 27, the compression process of reducing the volume of the compression chamber 27 by the compression action of the fixed scroll 51 and the orbiting scroll 52 by the revolving orbiting motion of the eccentric orbiting scroll 52. Migrate to That is, in the compression mechanism 35, when the orbiting scroll 52 revolves, the refrigerant gas is taken in from the outermost peripheral openings of the swirl portion 52b of the orbiting scroll 52 and the swirl portion 51b of the fixed scroll 51, which serve as suction ports. Along with the rotation of the orbiting scroll 52, it gradually goes to the center while being compressed.

  Then, the refrigerant gas compressed in the compression chamber 27 moves to the discharge process. That is, the compressed high-pressure refrigerant gas passes through the discharge port 53 of the fixed scroll 51, passes through the high-pressure chamber 26, and then is discharged to the outside of the electric compressor 100 through the discharge pipe 34.

  Note that the low-pressure refrigerant gas in the low-pressure chamber 25 and the high-pressure refrigerant gas in the high-pressure chamber 26 are partitioned by the fixed scroll 51 and the frame 54 so as to be kept airtight, and therefore do not coexist in the casing. Further, when the shaft 56 rotates, the refrigeration oil 40 is sucked by the centrifugal pump action of the oil pump 59 and is supplied to the main bearing 55 and the auxiliary bearing 58 through the oil supply passage 56b provided in the shaft 56. It returns to the lower shell 32 again by gravity through the oil return groove 61a. When the energization of the stator 61 is stopped, the electric compressor 100 stops operation.

  Therefore, since the electric compressor 100 includes any of the rotors described in the first to eighth embodiments, the electric compressor 100 has excellent demagnetization resistance and can obtain sufficient torque without increasing the size of the rotor. It has become a thing. Similarly, the rotating electric machine mounted on the electric compressor 100 can obtain the same effect.

Embodiment 10 FIG.
Next, a refrigeration air conditioner using the electric compressor described in Embodiment 9 will be described. In the tenth embodiment, a so-called separate air conditioner in which an indoor unit and an outdoor unit are connected by a refrigerant pipe will be described as an example, but a refrigeration using an electric compressor provided with the rotating electrical machine of the present invention is used. The air conditioner is not limited to this, and may be a refrigeration air conditioner of another form using a refrigeration cycle such as a refrigeration apparatus or another form of air conditioner. In the separate type air conditioner, the outdoor unit is provided with an electric compressor.

  FIG. 20 is a refrigerant circuit diagram illustrating a refrigeration cycle of the air-conditioning apparatus according to Embodiment 10. FIG. 21 is an exploded perspective view showing the outdoor unit of the separate air conditioner of the tenth embodiment.

  As shown in FIG. 20, the refrigerant circuit of the air conditioner includes an electric compressor 100 for compressing the refrigerant described in the ninth embodiment, a four-way valve 101 that switches the flow direction of the refrigerant in the cooling operation and the heating operation, An outdoor heat exchanger 102 that operates as a condenser during cooling operation, and operates as an evaporator during heating operation, and a decompressor 103 (electronically controlled expansion valve) that decompresses high-pressure liquid refrigerant into a low-pressure gas-liquid two-phase refrigerant The refrigeration cycle is configured by sequentially connecting the indoor heat exchanger 104 that operates as an evaporator during the cooling operation and as a condenser during the heating operation.

  A solid line arrow in FIG. 20 indicates a direction in which the refrigerant flows during the cooling operation. Moreover, the broken line arrow of FIG. 20 shows the direction through which the refrigerant flows during the heating operation.

  The outdoor heat exchanger 102 is provided with an outdoor fan 105, and the indoor heat exchanger 104 is provided with an indoor fan 106 (cross flow fan).

  During the cooling operation, the high-temperature and high-pressure refrigerant compressed from the electric compressor 100 is discharged and flows into the outdoor heat exchanger 102 via the four-way valve 101. In this outdoor heat exchanger 102, outdoor air passes through between the fins of the outdoor heat exchanger 102 and the tubes (heat transfer tubes) by the outdoor blower 105 provided in the air passage, and exchanges heat with the refrigerant. The refrigerant is cooled to a high-pressure liquid state, and the outdoor heat exchanger 102 acts as a condenser. Thereafter, the pressure is reduced through the pressure reducer 103 to become a low-pressure gas-liquid two-phase refrigerant and flows into the indoor heat exchanger 104. In the indoor side heat exchanger 104, the indoor air passes through between the fins and the tubes (heat transfer tubes) of the indoor side heat exchanger 104 by the driving of the indoor side fan 106 (cross flow fan) attached to the air passage, and the refrigerant. By exchanging heat, the air blown into the indoor space is cooled, while the refrigerant receives heat from the air and evaporates into a gaseous state (the indoor heat exchanger 104 acts as an evaporator). Return to the compressor 100. The indoor space is air-conditioned (cooled) by the air cooled by the indoor heat exchanger 104.

  Further, during the heating operation, the four-way valve 101 is inverted, so that the refrigerant flows in the opposite direction to the refrigerant flow during the cooling operation in the refrigeration cycle, and the indoor heat exchanger 104 serves as a condenser to perform outdoor heat exchange. Vessel 102 acts as an evaporator. The indoor space is air-conditioned (heated) by the air heated by the indoor heat exchanger 104.

  The configuration of the outdoor unit 110 of the air conditioner will be described with reference to FIG. The outdoor unit 110 of the air conditioner includes a substantially L-shaped outdoor heat exchanger 102 in a plan view, a bottom plate 111 (base) that forms the bottom of the casing of the outdoor unit 110, and a flat plate that forms the top surface of the casing. -Shaped top panel 112, front panel 113 having a substantially L-shape in plan view that constitutes the front and one side of the housing, side panel 114 constituting the other side of the housing, air passage (blower room) and machine Air is sent to the separator 115 that separates the chamber, the electrical box 116 that stores electrical components, the electric compressor 100 that compresses the refrigerant, the refrigerant piping and refrigerant circuit components 117 that form the refrigerant circuit, and the outdoor heat exchanger 102. The outdoor blower 105 is configured.

  As described in the ninth embodiment, the electric compressor 100 mounted on the outdoor unit 110 of the air-conditioning apparatus configured as described above has the demagnetization resistance described in the first to eighth embodiments. An air conditioner that can perform a refrigeration cycle efficiently without increasing the size of the outdoor unit because it is equipped with a rotating electrical machine that is excellent and has a rotor that can obtain sufficient torque without increasing the size of the rotor. Can be obtained.

DESCRIPTION OF SYMBOLS 1, 1a, 1b Iron core board 2 Inner periphery side iron core part 3 Outer periphery side iron core part 5 Intermediate | middle connection part 6 End side connection part, 6a Radial direction connection part, 6b, 6c Outer periphery connection part 7a, 7b Cavity part 8, 8a, 8b Refrigerant discharge path 9, 9a, 9b Magnet insertion hole 10, 10a, 10b Permanent magnet 11a, 11b, 12a, 12b Recessed part 14 Refrigerant passage hole 20 Rotor core 21 End plate 22, 22a, 22b Refrigerant suction hole 60 Rotor 100 Electric compressor 110 Outdoor unit of air conditioner 201, 202, 203, 211, 212, 213 Partial rotor core d gap

Claims (12)

A rotor core formed by laminating a plurality of core plates in the direction of the rotation axis, the core plate exhibiting a n-fold symmetrical shape with respect to the rotation axis so as to correspond to the number of magnetic poles;
A permanent magnet embedded in the permanent magnet insertion hole provided on the outer peripheral side of the rotor core so as to have a gap in the radial direction;
End plates respectively provided at both ends of the rotor core in the rotation axis direction;
A fluid suction hole provided in the end plate to communicate with the permanent magnet insertion hole;
With
One part divided into n equal parts for each magnetic pole in the iron core plate,
An inner peripheral side iron core part located on the rotating shaft side of the rotor core;
An outer peripheral side core portion located on the outer peripheral side of the rotor core; and
A plurality of connecting portions for connecting the inner peripheral side iron core part and the outer peripheral side iron core part;
Between the inner peripheral side iron core part and the outer peripheral side iron core part, they are arranged side by side in the rotation direction via the connecting part, and are provided to form the permanent magnet insertion hole when the iron core plates are stacked. A plurality of magnet insertion hole openings,
At least one of the magnet insertion hole openings communicates with the outside on the outer peripheral side of the rotor core;
Rotor with.   The said fluid discharge path is connected with the opening part for magnet insertion holes provided in the backmost with respect to the said rotation direction among the opening parts for magnet insertion holes which comprise one magnetic pole. Rotor.   When the rotor core has one surface of the iron core plate as a first surface and the other surface as a second surface, the first surface of the iron core plate faces in one direction of the rotation axis. The portion in which a plurality of the iron core plates are laminated, and the portion in which the iron core plates are laminated so that the second surface of the iron core plate faces in one direction of the rotation axis. The rotor according to 2.   The rotor core includes a first partial rotor core in which a plurality of first core plates are stacked, and a radial width of a magnet insertion hole opening communicating with the fluid discharge path. The second partial rotor core in which a plurality of second iron core plates larger than the width of the plate are stacked is coupled in the direction of the rotation axis so as to align the position of the magnetic pole with respect to the rotation direction. The rotor according to any one of claims.   The plurality of magnet insertion hole openings include a first magnet insertion hole opening and a second magnet insertion hole opening, and the plurality of coupling parts are the first magnet insertion hole openings. A first connecting portion provided between one end of the first portion and one end of the second magnet insertion hole opening, and a first connection portion provided on the other end side of the first magnet insertion hole opening. 5. The rotor according to claim 1, further comprising at least the other end of the second magnet insertion hole opening and the fluid discharge path.   The rotor according to claim 5, wherein the second magnet insertion hole opening has a shorter opening distance along the rotation direction than the first magnet insertion hole opening.   The rotor according to claim 5 or 6, wherein the second magnet insertion hole opening has a larger radial opening width than the first magnet insertion hole opening.   The first connecting part has a central axis in a direction in which the inner peripheral side core part and the outer peripheral side core part are coupled, and the central axis is inclined from the radial direction to the rotational direction side. The rotor according to any one of claims 5 to 7.   The rotor according to any one of claims 5 to 8, wherein the inner peripheral side iron core part and the outer peripheral side iron core part have an elliptical arc-shaped concave part at a joint portion with the first connecting part. The rotor according to any one of claims 1 to 9,
A stator provided on the outer periphery of the rotor;
A rotating electrical machine. The rotating electrical machine according to claim 10,
A compression mechanism that compresses a low-pressure fluid into a high-pressure fluid by being rotated by the rotating electrical machine;
An electric compressor. An electric compressor according to claim 11,
A first heat exchanger provided on a high pressure side of the electric compressor, into which a high pressure refrigerant flows from the electric compressor;
A second heat exchanger provided on the low-pressure side of the electric compressor and for discharging a low-pressure refrigerant to the electric compressor;
Provided between the first heat exchanger and the second heat exchanger in order to reduce the pressure of the high-pressure refrigerant flowing out of the first heat exchanger and flow into the second heat exchanger. A pressure reducer,
A refrigeration air conditioner comprising:

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