Rotary electric machine and pump device

Abstract

To provide a rotary electric machine that includes a rotor with an SPM structure suitable for high-speed rotation, and a pump device.SOLUTION: Rotary electric machines 3 to 3E have rotors R to RE and a rotary shaft 7 through which the rotation of the rotors is transmitted. The rotors or the rotary shaft have a core portion 71 having a cylindrical outer surface. The rotors have a plurality of magnets 81 to 88 fixed to the core portion and a resin material 12 fixing the plurality of magnets to the core portion. Each of the plurality of magnets is a seamless circular ring. Each of the plurality of magnets is arranged outside the core portion in a radial direction of the core portion, and is arranged along an axial direction of the core portion, and the resin material is filled between the core portion and the plurality of magnets.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine and a pump device. [Background technology]

[0002] A wet motor pump is used as one of the sealless motor pumps in which a rotating electric machine and a pump are integrally configured and there is no leakage of the pumped liquid. The rotating electric machine includes a rotating shaft, a rotor attached to the rotating shaft, and a stator. In the wet motor pump, the rotor and the stator are in contact with the pumped liquid.

[0003] The structure of the rotor included in a rotating electric machine can be broadly classified into a surface permanent magnet (SPM) structure in which magnets are attached to the outer peripheral surface of the rotor core, and an interior permanent magnet (IPM) structure in which magnets are embedded inside the rotor core.

[0004] In rotors with an SPM structure, magnets are not embedded inside the rotor core. Therefore, the outer diameter of a rotor with an SPM structure (hereinafter referred to as the "rotor diameter") can be smaller than that of an IPM structure. However, since the magnets in an SPM structure rotor are attached to the outer periphery of the rotor core, when the rotor rotation speed increases, the magnets may peel off due to the centrifugal force that accompanies the rotation of the rotor. Therefore, in rotors with an SPM structure, a cylindrical sleeve is attached to the outer periphery of the magnet to prevent the magnet from peeling off. In this case, the sleeve needs to be thick enough to withstand the magnet peeling off, and the rotor diameter becomes large. However, when the rotor diameter becomes large, the energy loss (so-called fluid loss) due to the resistance (friction) of the handled liquid in contact with the rotor increases. Therefore, rotors with an SPM structure are not suitable for high-speed rotation.

[0005] A method has been proposed to increase the strength of a magnet by using a seamless cylindrical magnet in a rotor with an SPM structure (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2022-149226 Summary of the Invention [Problem to be solved by the invention]

[0007] However, to attach a cylindrical magnet to the outer peripheral surface of the rotor core, the rotor core must be pressed into the magnet. This requires magnets that are manufactured with high precision. However, magnets are generally manufactured by sintering, so it is difficult to manufacture magnets with the dimensional precision required for press-fitting, and it is also difficult to process magnets by cutting. Furthermore, to obtain the output required for high-speed rotation, the rotor core must be thin and long, making it even more difficult to manufacture a cylindrical magnet that fits the rotor core. Therefore, it is difficult to realize a rotor with a PM structure that is suitable for high-speed rotation.

[0008] An object of the present invention is to provide a rotating electrical machine and a pump device that are provided with a rotor having an SPM structure suitable for high-speed rotation. [Means for solving the problem]

[0009] In one embodiment of the present invention, a rotating electric machine comprises a rotor and a rotating shaft to which rotation of the rotor is transmitted, and the rotor or the rotating shaft has a core portion having a cylindrical outer peripheral surface, and the rotor has a plurality of magnets fixed to the core portion and a first resin material fixing the plurality of magnets to the core portion, each of the plurality of magnets having a seamless circular ring shape, each of the plurality of magnets is positioned radially outward of the core portion and along the axial direction of the core portion, and the first resin material is filled between the core portion and the plurality of magnets.

[0010] A pump device according to one embodiment of the present invention includes the rotating electric machine according to any one of the above embodiments, and an impeller that rotates due to rotation of the rotating electric machine. Effect of the Invention

[0011] According to the present invention, it is possible to provide a rotating electrical machine and a pump device equipped with a rotor having an SPM structure suitable for high speed rotation. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic cross-sectional view showing an embodiment of a pump device according to the present invention. [Diagram 2] 2 is a partial schematic cross-sectional view showing an embodiment of a rotating electric machine according to the present invention provided in the pump device of FIG. 1. [Diagram 3] 3 is a schematic cross-sectional view of a rotor provided in the rotating electric machine of FIG. 2, taken along line AA. [Figure 4] 3 is a partially enlarged schematic cross-sectional view of a rotor included in the rotating electric machine of FIG. 2. [Diagram 5] 3 is a schematic cross-sectional view of a rotor provided in the rotating electric machine of FIG. 2, taken along line BB. [Figure 6] 3 is an exploded schematic cross-sectional view of a rotor included in the rotating electric machine of FIG. 2. [Figure 7] FIG. 4 is a partial schematic cross-sectional view showing a second embodiment of a rotating electric machine according to the present invention. [Figure 8] 8 is a schematic cross-sectional view taken along line CC of a rotor included in the rotating electric machine of FIG. 7. [Figure 9] FIG. 11 is a partial schematic cross-sectional view showing a third embodiment of a rotating electric machine according to the present invention. [Figure 10] 10 is a schematic cross-sectional view of a rotor provided in the rotating electric machine of FIG. 9, taken along line DD. [Figure 11] FIG. 11 is a partial schematic cross-sectional view showing a fourth embodiment of a rotating electric machine according to the present invention. [Figure 12] 12 is a partially enlarged schematic cross-sectional view of the rotating electric machine of FIG. 11. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of a pump device and a rotating electric machine according to the present invention will be described below. In the following description, the drawings will be referred to as appropriate. In the drawings, the same members and elements are given the same reference numerals, and duplicated descriptions will be omitted. Furthermore, the dimensional ratios of the elements may be exaggerated for the sake of convenience, and are not limited to the ratios shown in the drawings.

[0014] In the following description, a wet motor pump (hereinafter simply referred to as "pump") in which a pump section and a motor section are integrally constructed will be described as an example of a pump device according to the present invention. The pump is a sealless motor pump having a structure that prevents leakage of the pumped fluid, and has a structure in which the entire pump is immersed in the pumped fluid and a portion of the pumped fluid is also introduced into the motor section.

[0015] ●Pump equipment (1)● ●Configuration of pump device (1) First, an embodiment of a pump device according to the present invention (hereinafter simply referred to as a "pump device") will be described below.

[0016] FIG. 1 is a schematic cross-sectional view showing an embodiment of a pump device. In the figure, the flow of the pumped liquid is indicated by outlined arrows. For ease of explanation, the figure shows the pump device 1 in a simplified form.

[0017] The pump device 1 is used to pump a liquid (for example, water) to be handled. The pump device 1 includes a pump section 2, a motor section 3, and an impeller 4.

[0018] In the following description, the "forward direction" is the direction in which the impeller 4 is located relative to the motor unit 3, and the "rearward direction" is the opposite direction to the forward direction.

[0019] The pump section 2 sucks in and discharges the pumped liquid and includes a housing 21, a pump chamber 22, a suction pipe 23, a discharge pipe 24, and an internal flow path 25.

[0020] The housing 21 accommodates the motor unit 3 and defines a pump chamber 22 in which the impeller 4 is accommodated, and an internal flow path 25. The housing 21 is made of, for example, stainless steel. The front end of the housing 21 extends cylindrically forward to form a suction pipe 23. The rear end of the housing 21 extends cylindrically backward to form a discharge pipe 24. An internal flow path 25 is formed between the housing 21 and the motor unit 3 (housing 5 described later) along the front-rear direction. The internal flow path 25 communicates with the pump chamber 22 and the discharge pipe 24. That is, the housing 21 constitutes the pump chamber 22, the suction pipe 23, the discharge pipe 24, and the internal flow path 25.

[0021] The suction pipe 23 is a flow path for the pumped liquid to be sucked into the pump chamber 22 .

[0022] The discharge pipe 24 is a flow path for the pumped liquid discharged from the pump chamber 22 .

[0023] The internal flow passage 25 is a flow passage through which the pumped liquid sucked from the suction pipe 23 into the pump chamber 22 is guided to the discharge pipe 24 .

[0024] The motor unit 3 is driven under predetermined drive conditions to rotate the impeller 4 in the pump chamber 22. The motor unit 3 is housed in a housing 21. The motor unit 3 is an example of a rotating electric machine according to the present invention. A specific configuration of the motor unit 3 will be described later.

[0025] The impeller 4 is attached to a front end 7a of a rotary shaft 7, which will be described later, and rotates with the rotation of the rotary shaft 7. That is, the impeller 4 rotates with the rotation of the motor unit 3. As the impeller 4 rotates, it discharges the pumped fluid that has been sucked into the pump chamber 22 from the suction pipe 23 via the internal flow path 25 and the discharge pipe 24.

[0026] ●Motor section (1)● Motor section (1) configuration Next, the configuration of the motor unit 3 will be described below.

[0027] FIG. 2 is a schematic partial cross-sectional view showing an embodiment of the motor unit 3. As shown in FIG. This figure omits some of the configuration of the motor unit 3. This figure shows a non-sectional view of a rotating shaft 7, which will be described later. This figure also shows a schematic view of a rotor R, which will be described later. In the following description, FIG. 1 will be referred to as appropriate.

[0028] The motor section 3 includes a housing 5, a motor chamber 6, a rotating shaft 7, a magnet section 8, a pair of annular members 9 and 10, a sleeve 11, a resin material 12, a stator 13, and bearings 14 and 15. A part of the rotating shaft 7 (a large diameter section 71 described below), the magnet section 8, the pair of annular members 9 and 10, the sleeve 11, and the resin material 12 configure the rotor R of the present invention. That is, the motor section 3 includes the rotor R.

[0029] The housing 5 defines a motor chamber 6 that houses the rotating shaft 7, the magnet portion 8, the pair of annular members 9 and 10, the sleeve 11, the stator 13, and the bearings 14 and 15. The housing 5 is made of, for example, stainless steel. The housing 5 includes liquid inlets 51 and 52.

[0030] The liquid inlets 51, 52 are holes penetrating the housing 5. The liquid inlets 51, 52 communicate with the internal flow path 25 and the motor chamber 6, and introduce the pumped liquid into the motor chamber 6. The liquid inlets 51, 52 are disposed, for example, in the front part of the housing 5.

[0031] In the present invention, the liquid inlets 51 and 52 may be disposed in the rear or center of the housing 5.

[0032] Further, in the present invention, the number of the liquid inlets 51, 52 may be any number capable of introducing the pumped liquid into the motor chamber 6, and is not limited to "2".

[0033] The rotating shaft 7 rotates with the rotation of the rotor R and transmits rotational power to the impeller 4. The rotating shaft 7 has a cylindrical shape. The rotating shaft 7 includes a large diameter portion 71 and small diameter portions 72 and 73 having an outer diameter smaller than that of the large diameter portion 71.

[0034] In the following description, the "axial direction" refers to the direction along the rotation axis of the rotating shaft 7 (front-rear direction), the "radial direction" refers to the radial direction of the rotating shaft 7, and the "circumferential direction" refers to the circumferential direction of the rotating shaft 7. In the axial direction, the front end 7a of the rotating shaft 7 protrudes into the pump chamber 22.

[0035] In the axial direction, the large diameter portion 71 and the small diameter portions 72, 73 are cylindrical in shape, and the large diameter portion 71 and the small diameter portions 72, 73 have cylindrical outer circumferential surfaces 71a, 72a, 73a. In the axial direction, the large diameter portion 71 is disposed at the center of the rotating shaft 7. The small diameter portion 72 is disposed adjacent to the large diameter portion 71 forward of the large diameter portion 71, and the small diameter portion 73 is disposed adjacent to the large diameter portion 71 rearward of the large diameter portion 71. That is, in the axial direction, the small diameter portions 72, 73 are disposed on both sides (outside) of the large diameter portion 71 so as to sandwich the large diameter portion 71. In other words, the large diameter portion 71 is located between the small diameter portions 72, 73. In this way, the large diameter portion 71 and the small diameter portions 72, 73 constitute one shaft body (the rotating shaft 7). When viewed in the axial direction, the large diameter portion 71 is arranged concentrically with the small diameter portions 72 and 73. That is, the axial center of the rotating shaft 7 coincides with the axial center of the large diameter portion 71 and the axial center of the small diameter portions 72 and 73. Here, the large diameter portion 71 (a part of the rotating shaft 7 sandwiched between the small diameter portions 72 and 73 in the axial direction) functions as a rotor core of the rotor R. In this way, since the large diameter portion 71 functions as a rotor core, the outer diameter of the rotor core (the rotor diameter described later) can be reduced to a size close to the outer diameter of the rotating shaft 7, compared to when the rotor core is mounted on the rotating shaft 7 (when the rotating shaft 7 and the rotor core are separate). The large diameter portion 71 is an example of a core portion in the present invention. That is, the large diameter portion 71 functions as a core portion.

[0036] The magnet section 8 is fixed to the large diameter section 71, and rotates the rotating shaft 7 by the rotating magnetic field generated in the stator 13. The magnet section 8 includes a plurality of magnets (eight in this embodiment) 81, 82, 83, 84, 85, 86, 87, and 88. That is, the magnet section 8 is an assembly of a plurality of magnets (magnets 81-88). Each of the magnets 81-88 is, for example, a permanent magnet such as a neodymium magnet (rare earth magnet).

[0037] In the present invention, each of the magnets 81-88 is not limited to a neodymium magnet as long as it is a permanent magnet that can be used in the motor section 3. That is, for example, each of the magnets 81-88 may be a samarium-cobalt magnet or a ferrite magnet.

[0038] FIG. 3 is a schematic cross-sectional view of the rotor R taken along line AA in FIG. For ease of explanation, the figure shows a cross section of magnet 83, but the cross-sectional shape of magnet 83 is common to the cross-sectional shapes of the other magnets 81, 82, 84 to 88. Therefore, the configuration and shape of magnet 83 are common to the configuration and shape of magnets 81, 82, 84 to 88. For ease of explanation, the figure shows imaginary boundaries of magnetic poles (actual boundaries are not clear) described below with dashed lines. In the following explanation, FIG. 2 will be referred to as appropriate.

[0039] The shape of each of the magnets 81 to 88 is a seamless circular ring. The inner diameter of each of the magnets 81 to 88 is larger than the outer diameter of the large diameter portion 71. The magnet 81 has a front surface 81a, a rear surface 81b, an outer circumferential surface 81c, and an inner circumferential surface 81d. Similarly, each of the magnets 82 to 88 has front surfaces 82a, 83a, 84a, 85a, 86a, 87a, 88a, rear surfaces 82b, 83b, 84b, 85b, 86b, 87b, 88b, outer circumferential surfaces 82c, 83c, 84c, 85c, 86c, 87c, 88c, and inner circumferential surfaces 82d, 83d, 84d, 85d, 86d, 87d, 88d. The front surfaces 81a to 88a are an example of the first surface in the present invention, and the rear surfaces 81b to 88b are an example of the second surface in the present invention.

[0040] The large diameter portion 71 (rotating shaft 7) is gap-fitted to the magnets 81-88, and gaps through which the resin material 12 can penetrate are formed between the inner circumferential surfaces 81d-88d and the outer circumferential surface 71a of the large diameter portion 71. That is, in the radial direction, the magnets 81-88 are disposed outside the large diameter portion 71. In the axial direction, the magnets 81-88 are disposed along the axial direction, spaced apart from one another (without abutting against one another).

[0041] Each of the magnets 81-88 has multiple magnetic poles (two poles, an S pole and an N pole in this embodiment) that are arranged alternately in the circumferential direction. In the circumferential direction, the positions of the magnetic poles of each of the magnets 81-88 are the same. That is, in the axial direction, the S pole of each of the magnets 81-88 faces the S pole of each of the adjacent magnets 81-88, and the N pole of each of the magnets 81-88 faces the N pole of each of the adjacent magnets 81-88.

[0042] In the present invention, the number of magnets provided in the magnet section 8 is not limited to "8". That is, for example, the magnet section 8 may include "2" to "7", or "9" or more magnets. Here, the length (thickness) of the magnet section 8 in the axial direction and the number of magnets are appropriately set according to the magnetic flux required to drive the motor section 3. That is, for example, when the specifications of the motor section 3 are the same, the length (thickness) of the magnet section 8 in the axial direction is the same, and as the number of magnets increases, the length (thickness) of each magnet becomes shorter.

[0043] In the present invention, the number of magnetic poles of each of the magnets 81 to 88 is only required to be an even number and is not limited to "two poles." That is, for example, the number of magnetic poles of each of the magnets 81 to 88 may be "four poles" or "six poles."

[0044] FIG. 4 is a partially enlarged schematic cross-sectional view of the rotor R. This figure shows a non-sectional view of the rotating shaft 7. In the following description, FIG.

[0045] The annular members 9, 10 function as dummy weights for adjusting the rotation balance (rotation balance of the rotating shaft 7) when the rotating shaft 7 is rotating. The annular members 9, 10 are made of, for example, stainless steel. The shape of the annular members 9, 10 is annular. The shape of the annular member 9 is the same as the shape of the annular member 10, except for the presence or absence of a processed region 92 described later. In the radial direction, the annular members 9, 10 are attached (fixed) to the outside of the large diameter portion 71. The outer diameter of the annular members 9, 10 is approximately the same as the outer diameter of each of the magnets 81 to 88. The inner diameter of the annular members 9, 10 is approximately the same as the outer diameter of the large diameter portion 71.

[0046] FIG. 5 is a schematic cross-sectional view of the rotor R taken along line BB in FIG. For convenience of explanation, the figure shows a cross section of the annular member 9. In the following explanation, Figures 2 and 4 will be referred to as appropriate.

[0047] The annular member 9 includes a plurality of (six in this embodiment) grooves 91a, 91b, 91c, 91d, 91e, and 91f, a processing region 92, a front surface 9a, a rear surface 9b, an outer circumferential surface 9c, and an inner circumferential surface 9d. The large diameter portion 71 is press-fitted into the annular member 9, so that the annular member 9 is attached to the outside of the large diameter portion 71 in the radial direction. That is, the inner circumferential surface 9d abuts against the outer circumferential surface 71a of the large diameter portion 71. In the following description, when the grooves 91a to 91f are not particularly distinguished from one another, the grooves 91a to 91f are described as "groove portion 91."

[0048] The groove portion 91 is a groove formed on the inner peripheral surface 9d along the axial direction (front-rear direction). In the axial direction, the groove portion 91 communicates with the front side (one direction side) and the rear side (the other direction side) of the annular member 9. When viewed in the axial direction, the groove portion 91 has a substantially semicircular shape. In the circumferential direction, the groove portions 91a to 91f are disposed at equal intervals on the inner peripheral surface 9d. The groove portion 91 faces the outer peripheral surface 71a of the large diameter portion 71. As a result, the groove portion 91, together with the outer peripheral surface 71a, constitutes a hole that communicates the front side and the rear side of the annular member 9. In other words, the groove portion 91 communicates with the front end side (front surface 9a side) and the rear end side (rear surface 9b side) of the annular member 9.

[0049] The drawings to which primary reference will be made in this description are turned to FIGS. The processed area 92 is an area where processing is performed to adjust the rotation balance of the rotating shaft 7. The processing is performed, for example, by cutting a part of the outer peripheral surface 9c of the front part of the annular member 9. That is, the processed area 92 is an area formed by cutting a part of the outer peripheral surface 9c of the annular member 9 to adjust the rotation balance of the rotating shaft 7. As shown in FIG. 4, in this embodiment, the processing is performed only on the annular member 9, and not on the annular member 10. That is, in this embodiment, of the pair of annular members 9, 10, only the annular member 9 has the processing area 92, and the annular member 10 does not have a processing area.

[0050] The annular member 10 has a plurality of (six in this embodiment) grooves 101, a rear surface 10a, a front surface 10b, an outer circumferential surface 10c, and an inner circumferential surface 10d. The large diameter portion 71 is press-fitted into the annular member 10, so that the annular member 10 is attached to the outside of the large diameter portion 71 in the radial direction. In other words, the inner circumferential surface 10d abuts against the outer circumferential surface 71a of the large diameter portion 71.

[0051] The groove portion 101 is a groove formed on the inner peripheral surface 10d along the axial direction (front-rear direction). In the axial direction, the groove portion 101 communicates with the front side (one direction side) and the rear side (the other direction side) of the annular member 10. When viewed in the axial direction, the shape of the groove portion 101 (not shown) is approximately semicircular. In the circumferential direction, each groove portion 101 is disposed at equal intervals on the inner peripheral surface 10d. The groove portion 101 faces the outer peripheral surface 71a of the large diameter portion 71. As a result, the groove portion 101, together with the outer peripheral surface, constitutes a hole that communicates the rear surface 10a side and the front surface 10b side of the annular member 10. In other words, the groove portion 101 communicates with the rear end side (rear surface 10a side) and the front end side (front surface 10b side) of the annular member 10.

[0052] The annular member 9 is disposed in front of the magnet section 8 (magnet 81), and the annular member 10 is disposed behind the magnet section 8 (magnet 88). That is, the pair of annular members 9, 10 are disposed so as to sandwich the magnets 81-88 in the axial direction. For example, the annular members 9, 10 manufactured by cutting metal or the like are easier to process than the magnets 81-88 manufactured by sintering. Therefore, the rotational balance of the rotating shaft 7 can be adjusted more easily by processing the annular members 9, 10 than by processing the magnets 81-88.

[0053] In the present invention, when the rotation balance of the rotating shaft 7 is achieved, the annular member 9 does not need to have the machining region 92. On the other hand, each of the annular members 9 and 10 may have a machining region depending on the rotation balance of the rotating shaft 7. When the annular member 10 has a machining region, as in the machining region 92, a part of the outer peripheral surface 10c of the rear part of the annular member 10 is cut.

[0054] The sleeve 11 protects the magnet portion 8 (magnets 81-88). The sleeve 11 prevents the magnets 81-88 from peeling off from the rotating shaft 7, and prevents the magnets 81-88 from scattering if they are peeled off. The sleeve 11 is made of, for example, stainless steel. The sleeve 11 is cylindrical with both ends open in the axial direction. In the axial direction, the sleeve 11 has a front end 11a and a rear end 11b. The front end 11a is an example of one end of the sleeve in the present invention, and the rear end 11b is an example of the other end of the sleeve in the present invention. The inner diameter of the sleeve 11 is larger than the outer diameter of the magnets 81-88 and the outer diameter of the annular members 9 and 10.

[0055] A part of the rotating shaft 7 (large diameter portion 71), each of the magnets 81-88, and each of the annular members 9 and 10 are accommodated inside the sleeve 11. The front end portion 11a of the sleeve 11 is arranged so as to overlap with the rear half portion of the annular member 9. The rear end portion 11b of the sleeve 11 is arranged so as to overlap with the front half portion of the annular member 10. That is, the sleeve 11 is arranged so as to cover each of the magnets 81-88 and each of the annular members 9 and 10 in the axial and circumferential directions. The part of the annular member 9 that is not covered by the sleeve 11 (the front half portion) can be a cuttable area (machined area 92). Similarly, the part of the annular member 10 that is not covered by the sleeve 11 (the rear half portion) can be a cuttable area (machined area of ​​the annular member 10). In this way, each of the annular members 9 and 10 has a cuttable area that is not covered by the sleeve 11. Therefore, the annular members 9 and 10 are easy to machine. Therefore, the rotation balance of the rotating shaft 7 can be easily adjusted.

[0056] The resin material 12 fixes the magnets 81-88 to the large diameter portion 71 and fixes the sleeve 11 in a predetermined position (a position covering the magnets 81-88 and parts of the annular members 9 and 10). The resin material 12 is, for example, an epoxy resin adhesive, and functions as the first resin material in the present invention when the liquid adhesive hardens. The resin material 12 is filled in the grooves 91 and 101, between the large diameter portion 71 and the magnets 81-88, between adjacent magnets 81-88, between the magnet 81 and the annular member 9, between the magnet 88 and the annular member 10, between the magnets 81-88 and the sleeve 11, and between parts of the annular members 9 and 10 and the sleeve 11. At this time, the resin material 12 is in contact with the outer peripheral surface 71a of the large diameter portion 71, the grooves 91, 101, rear surface 9b, front surface 10b, and part of the outer peripheral surfaces 9c, 10c of the annular members 9, 10, the inner peripheral surfaces 81d-88d, front surfaces 81a-88a, rear surfaces 81b-88b, and outer peripheral surfaces 81c-88d of the magnets 81-88, and the inner peripheral surface of the sleeve 11. That is, the magnets 81-88 are completely covered with the resin material 12 and are not exposed to the outside. The resin material 12 is also filled in the grooves 91, 101. Therefore, the pumped liquid does not enter the inside of the rotor R through the grooves 91, 101. Therefore, the magnets 81-88 do not come into contact with the pumped liquid in the motor chamber 6 filled with the pumped liquid.

[0057] As described above, the large diameter portion 71, the magnets 81-88, the pair of annular members 9 and 10, the sleeve 11, and the resin material 12 constitute the rotor R of the present invention. That is, the rotor R includes the magnets 81-88, the pair of annular members 9 and 10, the sleeve 11, and the resin material 12. The rotor R of the present invention functions as a rotor with an SPM structure in which the magnet portion 8 is attached to the outer circumferential surface 71a of the large diameter portion 71.

[0058] The drawings to which primary reference is made in this description are turned back to FIGS. The stator 13 generates a rotating magnetic field that rotates the rotor R (rotating shaft 7). In the radial direction, the inner peripheral surface of the stator 13 directly faces the outer peripheral surface of the rotor R (for example, the outer peripheral surface of the sleeve 11). The stator 13 is a known stator that rotates the rotor R.

[0059] Bearings 14 and 15 are attached to housing 5 and rotatably support rotating shaft 7. Bearing 14 supports a front portion (small diameter portion 72) of rotating shaft 7, and bearing 15 supports a rear portion (small diameter portion 73) of rotating shaft 7. Bearings 14 and 15 are, for example, known ball bearings.

[0060] Motor part (1) manufacturing process Next, a description will be given below of a manufacturing process (manufacturing method) for the motor unit 3. In the following description, FIGS. 1 to 5 will be referred to as appropriate.

[0061] FIG. 6 is an exploded schematic cross-sectional view of the rotor R. The figure shows the rotating shaft 7 in a non-sectional view.

[0062] First, the rotating shaft 7, the pair of annular members 9 and 10, and the eight magnetic bodies are prepared. The main manufacturing steps of the motor unit 3 include an annular body mounting step, a sleeve mounting step, a resin material filling step, a magnetizing step, an assembly step, and a processing step.

[0063] The "magnetic bodies" are the base bodies of the magnets 81-88 (magnet section 8) before they are magnetized. Therefore, in the following description, each magnetic body is given the same reference numerals "81-88" as the corresponding magnets 81-88 after magnetization. That is, for example, the magnetic body 81 is the base body that will become the magnet 81 after magnetization, and the magnetic body 82 is the base body that will become the magnet 82 after magnetization.

[0064] Next, the annular members, that is, the pair of annular members 9 and 10 and the magnetic bodies 81 to 88 are attached to the rotating shaft 7 (annular member attachment step).

[0065] In the annular body attachment step, first, the large diameter portion 71 is press-fitted from the rear into the annular member 9. At this time, the groove portion 91, together with the outer circumferential surface 71a of the large diameter portion 71, forms a hole that connects the front side and the rear side of the annular member 9.

[0066] Next, the large diameter portion 71 is inserted (loosely fitted) from the front into each of the magnetic bodies 81 to 88 in a loose fit state. That is, the large diameter portion 71 is inserted into the magnetic body 81, the magnetic body 82, . . . , the magnetic body 88 in that order.

[0067] Next, the large diameter portion 71 is press-fitted into the annular member 10 from the front. At this time, the groove portion 101, together with the outer peripheral surface 71a of the large diameter portion 71, constitutes a hole that communicates the front side and the rear side of the annular member 10. In addition, the annular member 10 is attached to the large diameter portion 71 so that the distance between the rear surface 9b of the annular member 9 and the front surface 10b of the annular member 10 in the axial direction is slightly longer than the length of the magnet portion 8. Therefore, gaps that allow each of the magnetic bodies 81 to 88 to move in the front-rear direction can be formed between the annular member 9 and the magnetic body 81, between the adjacent magnetic bodies 81 to 88, and between the magnetic body 88 and the annular member 10. In addition, gaps due to slight fitting allowances of the clearance fit are formed between the outer peripheral surface 71a of the large diameter portion 71 and the inner peripheral surfaces 81d to 88d of each of the magnetic bodies 81 to 88.

[0068] Next, the rotating shaft 7 to which the annular members 9, 10 and the magnetic bodies 81-88 are attached is loosely fitted into the sleeve 11 (sleeve attachment process). In this way, the rotor R (the rotor R excluding the resin material 12) before the rotating shaft 7 (large diameter portion 71), the magnetic bodies 81-88, the annular members 9, 10, and the sleeve 11 are fixed with the resin material 12 is configured.

[0069] Next, in order to fix each of the magnetic bodies 81-88 to the large diameter portion 71 and to fix the sleeve 11 to each of the magnetic bodies 81-88 (i.e., to fix the rotor R to the rotating shaft 7), the resin material 12 is filled inside the rotor R (resin material filling process). The resin material 12 is filled by, for example, a known vacuum impregnation process.

[0070] In one example of the vacuum impregnation process, first, the rotor R and the rotating shaft 7 before being fixed with the resin material 12 are accommodated in a chamber (not shown), and the chamber is depressurized to a vacuum atmosphere. At this time, a container in which the liquid resin material 12 is stored in advance is also accommodated in the chamber. In addition, since the purpose of the resin material filling step is to fill the rotor R with the resin material 12, the surfaces of the rotor R and the rotating shaft 7 (small diameter portions 72, 73) other than the portions to be filled with the resin material 12 are masked to prevent the resin material 12 from adhering thereto.

[0071] Next, under a vacuum atmosphere, the rotor R and the rotating shaft 7 are immersed in a container of the resin material 12. At this time, the resin material 12 is impregnated into the inside of the rotor R from the grooves 91, 101 of the annular members 9, 10 and between the annular members 9, 10 and the sleeve 11. At this time, the resin material 12 is impregnated between the magnets 81 to 88, between the magnet 81 and the annular member 9, and between the magnet 88 and the annular member 10 due to capillary action or the like. Also, due to the influence of the surface tension of the resin material 12, the magnetic bodies 81 to 88 move in the radial direction so that the centers of the magnetic bodies 81 to 88 and the center of the rotating shaft 7 (large diameter portion 71) coincide with each other when viewed in the axial direction. Similarly, the magnetic bodies 81 to 88 move in the axial direction so that the intervals between the magnetic bodies 81 to 88 are approximately equal. As a result, the magnets 81 to 88 are not in contact with each other. Next, the pressure in the chamber is returned from the vacuum atmosphere to the air atmosphere. As a result, the resin material 12 is impregnated (filled) in the groove portions 91, 101, between the large diameter portion 71 and each of the magnetic bodies 81-88, between adjacent magnetic bodies 81-88, between the magnetic body 81 and the annular member 9, between the magnetic body 88 and the annular member 10, between each of the magnetic bodies 81-88 and the sleeve 11, and between parts of the annular members 9, 10 and the sleeve 11.

[0072] Thereafter, the resin material 12 hardens, whereby the magnetic bodies 81-88 are fixed to the large diameter portion 71, and the sleeve 11 is fixed to the magnetic bodies 81-88 and the annular members 9, .

[0073] Next, the magnetic bodies 81-88 are magnetized by a known magnetization method (magnetization process). Through the magnetization process, the magnetic bodies 81-88 become magnets 81-88 having, for example, two magnetic poles. In this way, the rotor R having the SPM structure is manufactured in which the rotating shaft 7, the magnets 81-88, the annular members 9 and 10, and the sleeve 11 are integrated (fixed) with the resin material 12.

[0074] Next, the rotating shaft 7, the rotor R, the stator 13, and the bearings 14 and 15 are assembled into the housing 5 (assembly process).

[0075] Next, as necessary, parts of the annular members 9, 10 are machined to form machined regions 92 in order to adjust the rotational balance of the rotating shaft 7 (rotor R) (machining step).

[0076] In the present invention, the magnetizing step may be performed after the processing step.

[0077] The motor section 3 is manufactured by such a manufacturing method. In the present invention, the magnet section 8 is composed of eight magnets 81-88 each having a seamless circular shape. Therefore, the tensile strength of each magnet 81-88 when centrifugal force is applied is higher than that of a magnet having a joint. In addition, each magnet 81-88 is integrated and fixed by the resin material 12. Therefore, the magnets 81-88 are unlikely to peel off due to the centrifugal force accompanying the rotation of the rotor R (rotation of the rotating shaft 7). As a result, the magnets 81-88 are unlikely to scatter, and the strength required for the sleeve 11 is small. Therefore, the thickness of the sleeve 11, that is, the outer diameter of the rotor R (hereinafter referred to as the "rotor diameter") can be made small. Therefore, the energy loss (fluid loss) due to the resistance (friction) of the handled liquid in contact with the rotor R in the motor chamber 6 is reduced. As a result, the rotor R can withstand high-speed rotation. Therefore, the rotor R with the SPM structure suitable for high-speed rotation is realized.

[0078] Furthermore, the large diameter portion 71 is loosely fitted into each of the magnets 81-88 by clearance fit. Therefore, the dimensional accuracy required for each of the magnetic bodies (magnets) 81-88 manufactured by sintering is less stringent than the dimensional accuracy required for a conventional annular magnet into which a rotor core is press-fitted. Furthermore, the magnet portion 8 is divided into each of the magnets 81-88. Therefore, the dimensional accuracy required for each of the magnetic bodies (magnets) 81-88 manufactured by sintering is less stringent than the dimensional accuracy required for a conventional single long cylindrical magnet. Furthermore, assembly of the rotor R is easier than assembly of a rotor using a conventional single long cylindrical magnet that requires dimensional accuracy.

[0079] Furthermore, between the adjacent magnets 81-88, a gap is formed through which the resin material 12 can penetrate, and the resin material 12 is filled in the gap. At this time, the magnets 81-88 are integrated by the resin material 12. Here, the thermal expansion coefficient of the large diameter portion 71 (rotating shaft 7) which is the rotor core is different from that of each of the magnets 81-88. Therefore, when the temperature environment in which the pump device 1 is used is different from the temperature environment at the time of manufacturing the rotor R, a difference in the amount of thermal expansion / contraction occurs between the large diameter portion 71 and the magnet portion 8 in the axial direction. Since both the large diameter portion 71 and the magnet portion 8 are made of metal having a high Young's modulus, the difference cannot be absorbed, and a large distortion force (stress) occurs between the large diameter portion 71 and the magnet portion 8. As a result, if the magnet portion 8 had a structure in which it was not divided, it would be difficult to fix the magnet portion 8 to the large diameter portion 71. In this embodiment, the magnet section 8 is divided into eight magnets 81-88, and the difference in the amount of expansion / contraction occurring between the large diameter section 71 and each of the magnets 81-88 is smaller than the difference when the magnet section 8 is not divided. Furthermore, since the resin material 12 having a lower Young's modulus than metal is filled between each of the magnets 81-88, the distortion force (stress) due to thermal expansion / contraction is mitigated (absorbed) by the resin material 12. In this way, the influence of thermal expansion / contraction occurring in the large diameter section 71 and each of the magnets 81-88 is suppressed.

[0080] Summary (1) According to the embodiment described above, the motor section 3 includes the rotor R and the rotating shaft 7. The rotating shaft 7 includes the large diameter section 71. The rotor R includes a plurality of (eight) magnets 81-88 fixed to the large diameter section 71, and a resin material 12 that fixes the magnets 81-88 to the large diameter section 71. Each of the magnets 81-88 has a seamless circular shape. According to this configuration, the tensile strength of each of the magnets 81-88 when centrifugal force is applied is higher than that of a magnet having a joint, so that the magnets 81-88 are less likely to peel off due to the centrifugal force caused by the rotation of the rotor R, and the magnets 81-88 are less likely to scatter. Therefore, in the rotor R (motor section 3), the thickness of the sleeve 11 can be made thin and the rotor diameter can be made small. Therefore, energy loss (fluid loss) due to resistance (friction) of the handled liquid in contact with the rotor R in the motor chamber 6 is reduced. As a result, the rotor R can withstand high-speed rotation. Therefore, a rotor R with an SPM structure suitable for high speed rotation is realized.

[0081] Moreover, in the radial direction, each magnet 81-88 is disposed outside the large diameter portion 71, and in the axial direction, each magnet is disposed along the large diameter portion 71. The resin material 12 is filled between the large diameter portion 71 and each magnet 81-88, and between adjacent magnets 81-88. With this configuration, the dimensional accuracy required for each magnetic body (magnet) 81-88 manufactured by sintering is relaxed compared to the dimensional accuracy required for a conventional annular magnet into which a rotor core is press-fitted. Furthermore, the magnet portion 8 is divided into each magnet 81-88. Therefore, the dimensional accuracy required for each magnetic body (magnet) 81-88 manufactured by sintering is relaxed compared to the dimensional accuracy required for a conventional single long cylindrical magnet. Furthermore, the assembly of the rotor R is easier than the assembly of a rotor using a conventional single long cylindrical magnet that requires dimensional accuracy. Furthermore, the difference in the amount of thermal expansion / contraction occurring between the large diameter portion 71 and each magnet 81-88 is smaller than the difference when the magnet portion 8 is not divided.

[0082] Furthermore, according to the embodiment described above, the pump device 1 includes the motor unit 3 and the impeller 4. With this configuration, the pump device 1 is realized that includes the rotor R of the SPM structure suitable for high-speed rotation.

[0083] Furthermore, according to the embodiment described above, resin material 12 is filled between adjacent magnets 81-88 in the axial direction. With this configuration, distortion force (stress) due to thermal expansion / contraction is mitigated by resin material 12. Therefore, the effects of thermal expansion / contraction occurring in large diameter portion 71 and each of magnets 81-88 are suppressed.

[0084] Furthermore, according to the embodiment described above, the rotor R includes a pair of annular members 9, 10 that are annular and attached to the large diameter portion 71. The pair of annular members 9, 10 are arranged so as to sandwich the magnets 81-88 in the axial direction. The pair of annular members 9, 10 are arranged outside the large diameter portion 71 in the radial direction. At least one of the pair of annular members 9, 10 (for example, the annular member 9) includes a processed region 92 that is processed to adjust the rotation balance of the rotating shaft 7. According to this configuration, the annular members 9, 10, which are easier to process than the magnets 81-88 manufactured by sintering, are arranged so as to sandwich the magnets 81-88 in the axial direction. As a result, the rotation balance of the rotating shaft 7 can be easily adjusted.

[0085] Furthermore, according to the embodiment described above, the outer peripheral surface 71a of the large diameter portion 71 abuts against the inner peripheral surfaces 9d, 10d of the pair of annular members 9, 10. The pair of annular members 9, 10 each include a groove portion 91, 101 disposed on the inner peripheral surfaces 9d, 10d of the annular members 9, 10. In the axial direction, the groove portions 91, 101 communicate with one side and the other side of the annular members 9, 10. According to this configuration, even if the large diameter portion 71 is press-fitted into the annular members 9, 10, the resin material 12 can be filled (impregnated) into the rotor R from the groove portions 91, 101.

[0086] Furthermore, according to the embodiment described above, the resin material 12 is filled in the grooves 91, 101. With this configuration, the pumped fluid does not infiltrate into the rotor R through the grooves 91, 101.

[0087] Furthermore, according to the embodiment described above, the large diameter portion 71 (part of the rotating shaft 7) functions as a core portion of the rotor core. With this configuration, the outer diameter of the core portion can be reduced to close to the outer diameter of the rotating shaft 7. As a result, the rotor diameter can be further reduced.

[0088] Furthermore, according to the embodiment described above, the rotor R includes a cylindrical sleeve 11 arranged to cover each of the magnets 81-88 in the circumferential direction. The resin material 12 is filled between each of the magnets 81-88 and the sleeve 11. According to this configuration, each of the magnets 81-88 (the entire magnet portion 8) is covered and protected by the resin material 12, and the surface of the magnet portion 8 is also protected by the sleeve 11. Since the magnet portion 8 is entirely covered (protected) by the resin material 12 and the sleeve 11, it is not exposed to the outside. Therefore, the magnets 81-88 do not come into contact with the handled liquid in the motor chamber 6 filled with the handled liquid. As a result, the magnet portion 8 is not damaged (affected by) the handled liquid.

[0089] Furthermore, according to the embodiment described above, the front end 11a of the sleeve 11 covers a part (rear half) of the annular member 9, and the rear end 11b of the sleeve 11 covers a part (front half) of the annular member 10. According to this configuration, the sleeve 11 is arranged to cover each of the magnets 81 to 88 and a part of the annular members 9 and 10 in the circumferential direction. The part (front half) of the annular member 9 that is not covered by the sleeve 11 can be a cuttable area (machined area 92) in the assembled rotor R. Similarly, the part (rear half) of the annular member 10 that is not covered by the sleeve 11 can be a cuttable area (machined area of ​​the annular member 10) in the assembled rotor R. In addition, since each of the annular members 9 and 10 has a cuttable area that is not covered by the sleeve 11, the annular members 9 and 10 are easy to machine. Therefore, the rotation balance of the rotating shaft 7 can be easily adjusted.

[0090] In the first embodiment, adjacent magnets 81-88 are in contact with each other, and resin material 12 may not be filled between adjacent magnets 81-88, or resin material 12 may be partially impregnated due to unevenness or the like. Furthermore, resin material 12 may not be filled between some of adjacent magnets 81-88. Even with this configuration, a rotor R with an SPM structure suitable for high-speed rotation can be realized.

[0091] ●Motor section (2)● Motor section (2) configuration Next, another embodiment (hereinafter referred to as "second embodiment") of a rotating electric machine (motor section) according to the present invention will be described below, focusing on the differences from the previously described embodiment (hereinafter referred to as "first embodiment"). The motor section according to the second embodiment differs from the motor section according to the first embodiment in that a second resin material is applied to the magnet. In the following description of the second embodiment, for convenience of explanation, the same members as those in the first embodiment and members having common functions are given the same reference numerals as those in the first embodiment, and detailed explanations will be omitted. In the following description, reference will be made to Figures 1 to 6 as appropriate.

[0092] FIG. 7 is a partial schematic cross-sectional view showing a second embodiment of a motor unit according to the present invention. In this figure, a part of the configuration of the motor unit 3A is omitted, and the rotating shaft 7 is shown in a non-sectional view.

[0093] The motor section 3A includes a housing 5, a motor chamber 6, a rotating shaft 7, a magnet section 8A, a pair of annular members 9 and 10, a sleeve 11, a resin material 12, a stator 13, and bearings 14 and 15. The large diameter section 71, the magnet section 8A, the pair of annular members 9 and 10, the sleeve 11, and the resin material 12 configure a rotor RA in the present invention. That is, the motor section 3A includes a rotor RA. In the second embodiment, the pump device 1 includes a motor section 3A instead of the motor section 3.

[0094] Magnet section 8A is fixed to large diameter section 71 and rotates rotating shaft 7 by a rotating magnetic field generated in stator 13. Magnet section 8A includes a plurality of magnets (eight in this embodiment) 81-88 and a resin material 89. Each of magnets 81-88 includes front surfaces 81a-88a, rear surfaces 81b-88b, outer peripheral surfaces 81c-88c, and inner peripheral surfaces 81d-88d.

[0095] The resin material 89 forms gaps between the adjacent magnets 81-88 into which the resin material 12 is filled, and, similar to the resin material 12, relieves (absorbs) stress between the magnets 81-88 due to thermal expansion / contraction of the magnets 81-88. The resin material 89 is, for example, an adhesive material of an epoxy resin like the resin material 12. The resin material 89 is applied to the front surfaces 81a-88a and rear surfaces 81b-88b of the magnets 81-88. In the axial direction, the length (thickness) of the resin material 89 is, for example, several tens of μm to several hundreds of μm. That is, the resin material 89 is in the form of a thin film. The resin material 89 is an example of a second resin material in the present invention.

[0096] In the present invention, the material of the resin material 89 is not limited to an epoxy resin adhesive.

[0097] FIG. 8 is a schematic cross-sectional view of the motor unit 3A taken along line CC in FIG. The figure shows a cross section in an imaginary plane including the front surface of resin material 89 applied to front surface 81a of magnet 81 (i.e., resin material 89 is shown in a non-cross section). For ease of explanation, the figure shows outer peripheral surface 81c and inner peripheral surface 81d of magnet 81 by two-dot chain lines.

[0098] The resin material 89 includes six resin materials 89a, 89b, 89c, 89d, 89e, and 89f applied to six locations on each of the front surface 81a and the rear surface 81b of the magnet 81. The resin materials 89a to 89f are arranged at equal intervals in the circumferential direction. The resin materials 89a to 89f are applied along the radial direction from the inner end to the outer end of each of the front surface 81a and the rear surface 81b. That is, the resin materials 89a to 89f are applied radially. When viewed in the axial direction, the positions of the resin materials 89a to 89f applied to the front surface 81a are the same as the positions of the resin materials 89a to 89f applied to the rear surface 81b. In the circumferential direction, the resin material 12 is filled between the adjacent resin materials 89a to 89f. In the following description, when the resin materials 89a to 89f are not particularly distinguished from each other, the resin materials 89a to 89f are referred to as "resin material 89."

[0099] The resin material 89 is also applied to the front surfaces 82a-88a and rear surfaces 82b-88b of the magnets 82-88 in the same manner as the magnet 81. That is, the resin material 89a-89f is applied to six locations on each of the front surfaces 82a-88a and rear surfaces 82b-88b of the magnets 82-88. Therefore, the resin material 89 is disposed between the magnets 81-88, between the magnet 81 and the annular member 9, and between the magnet 88 and the annular member 10.

[0100] In the present invention, the number of resin materials 89 radially applied to each of the front surfaces 81a-88a and the rear surfaces 81b-88b is not limited to "6". That is, for example, the number of the resin materials 89 may be "5" or less, or "7" or more. Also, each of the resin materials 89a-89f may be applied so that adjacent resin materials 89a-89f are connected to each other. In this case, for example, each of the resin materials 89a-89f may be applied so as to be integrated by a ring-shaped resin material 89. In this case, the ring-shaped resin material 89 is applied so as to connect inner parts of each of the resin materials 89a-89f to each other in the radial direction.

[0101] Motor section (2) manufacturing process Next, a manufacturing process (manufacturing method) for the motor portion 3A will be described below. In the following description, FIGS. 6 to 8 will be referred to as appropriate.

[0102] First, the rotating shaft 7, the pair of annular members 9 and 10, and the eight magnetic bodies 81 to 88 are prepared. The main manufacturing processes for the motor unit 3A include a coating process, an annular body mounting process, a sleeve mounting process, a resin filling process, a magnetizing process, an assembly process, and a processing process.

[0103] Next, the resin material 89 is applied to the front surfaces 81a-88a and rear surfaces 81b-88b of each of the magnetic bodies 81-88 (application process). Specifically, each of the resin materials 89a-89f is applied (radially) at equal intervals in the circumferential direction so as to follow the radial direction. At this time, each of the resin materials 89a-89f is applied by spraying or brushing, for example, in a state in which the areas other than the areas to be applied are covered with masking tape or a mask. Next, the resin material 89 applied to each of the magnetic bodies 81-88 is dried.

[0104] Next, the annular members, that is, the pair of annular members 9 and 10 and the magnetic bodies 81 to 88 are attached to the rotating shaft 7 (annular member attachment step).

[0105] In the annular body mounting process, the annular member 10 is attached to the large diameter portion 71 so as to lightly press the magnetic bodies 81 to 88 forward. The magnetic bodies 81 to 88 are arranged so that the resin materials 89a to 89f applied to the magnetic bodies 81 to 88 are in the same position in the circumferential direction. Therefore, for example, between the adjacent magnetic bodies 81 and 82, the resin material 89 applied to the rear surface 81b abuts against the resin material 89 applied to the front surface 82a. As a result, a gap filled with the resin material 12 is formed between the adjacent resin materials 89a to 89f in the circumferential direction. The same gap is also formed between the adjacent magnetic bodies 82 to 88. A gap is also formed between the outer peripheral surface 71a of the large diameter portion 71 and the inner peripheral surfaces 81d to 88d of the magnetic bodies 81 to 88.

[0106] In the present invention, the annular body attaching step may be performed without drying the resin material 89, and adjacent magnets 81 to 88 may be bonded to each other by the resin material 89.

[0107] Next, a sleeve mounting process and a resin material filling process are performed. In the resin material filling process, the resin material 12 is impregnated (filled) in the grooves 91, 101, between the large diameter portion 71 and each of the magnetic bodies 81 to 88, between adjacent magnetic bodies 81 to 88 (between adjacent resin materials 89a to 89f), between the magnetic body 81 and the annular member 9 (between adjacent resin materials 89a to 89f), between the magnetic body 88 and the annular member 10 (between adjacent resin materials 89a to 89f), between each of the magnetic bodies 81 to 88 and the sleeve 11, and between parts of the annular members 9, 10 and the sleeve 11. That is, the resin material 12 is also in contact with the resin material 89. Thereafter, the resin material 12 is hardened.

[0108] Next, the magnetizing step, the assembling step, and the processing step are carried out.

[0109] In the motor section 3A manufactured by this manufacturing method, similarly to the motor section 3 according to the first embodiment, when centrifugal force is applied, the tensile strength of each of the magnets 81-88 is high and the magnets 81-88 are unlikely to peel off. Furthermore, the rotor diameter can be made small. This reduces energy loss (fluid loss) in the motor chamber 6 and enables the rotor RA to withstand high-speed rotation. This realizes a rotor RA with an SPM structure suitable for high-speed rotation.

[0110] Similarly, the dimensional accuracy required for each of the magnetic bodies (magnets) 81 to 88 is less stringent than that required for conventional magnets, and therefore assembly of the rotor RA is easier than assembling a conventional rotor.

[0111] Between adjacent magnets 81-88, the resin material 89 reliably forms gaps into which the resin material 12 can penetrate, and the resin material 12 is filled in these gaps. That is, in the second embodiment, the resin material 12 having a lower Young's modulus than metal is filled between the magnets 81-88, and the resin material 89 is also applied. Therefore, the distortion force (stress) due to thermal expansion / contraction is further alleviated (absorbed) by the resin materials 12, 89.

[0112] In the annular body attachment step, the annular member 10 may be attached to the large diameter portion 71 so that the distance between the rear surface 9b of the annular member 9 and the front surface 10b of the annular member 10 is slightly longer than the length of the magnet portion 8. In this case, the resin material 12 may also be filled between the opposing resin materials 89 and between the opposing resin materials 89 and the annular members 9, 10, as in the first embodiment.

[0113] In the resin filling step, the resin material 12 may also be filled between the opposing resin materials 89 and between the opposing resin materials 89 and the annular members 9, 10 by capillary action, for example.

[0114] Summary (2) According to the second embodiment described above, the motor section 3A provides the same effects as the motor section 3 according to the first embodiment.

[0115] Furthermore, according to the second embodiment described above, the rotor RA includes resin material 89 disposed between adjacent magnets 81-88. The resin material 89 abuts against the resin material 12 between adjacent magnets 81-88. With this configuration, the resin materials 12, 89, which have a lower Young's modulus than metal, are filled or applied between the magnets 81-88, so that distortion forces (stresses) due to thermal expansion / contraction are further alleviated (absorbed) by the resin materials 12, 89.

[0116] Furthermore, according to the second embodiment described above, the resin material 89 is applied to the front surfaces 81a-88a and rear surfaces 81b-88b of each of the magnets 81-88. With this configuration, the thickness and shape of the resin material 89 can be adjusted as desired. Therefore, the positions and amounts of the resin material 12 filled between the magnets 81-88 can also be adjusted as desired.

[0117] In the second embodiment, the shape of the resin material 89 applied to each of the magnets 81-88 is not limited to that of the present embodiment. That is, for example, the shape of the resin material 89 applied to the front surfaces 81a-88a may be different from the shape of the resin material 89 applied to the rear surfaces 81b-88b. Also, for example, the resin material 89 applied to the front surfaces 82a-88a may be arranged so as not to face the resin material 89 applied to the rear surfaces 81b-87b. Furthermore, for example, the resin material 89 may be applied in the shape of a ring concentric with each of the magnets 81-88.

[0118] In the second embodiment, the resin material 89 may be configured in the form of a seal and attached to each of the magnets 81-88.

[0119] Furthermore, in the second embodiment, the thickness of each resin material 89 may be different. In other words, the intervals between adjacent magnets 81 to 88, between the magnet 81 and the annular member 9, and between the magnet 88 and the annular member 10 may be different. That is, for example, the thickness of each resin material 89 may be configured to be thicker from the center of the core portion toward the end of the core portion in the axial direction. Due to the difference in the amount of thermal expansion / contraction between the large diameter portion 71 and the magnet portion 8, the distortion force (stress) due to the difference in the amount of thermal expansion / contraction in the axial direction becomes larger the further away from the center. With this configuration, each resin material 89 can absorb stress better than the resin material 89 in the second embodiment.

[0120] ●Motor section (3)● Motor section (3) configuration Next, still another embodiment (hereinafter referred to as "third embodiment") of a rotating electric machine (motor section) according to the present invention will be described below, focusing on the differences from the first and second embodiments. The motor section according to the third embodiment differs from the motor sections according to the first and second embodiments in that it is provided with a spacer. In the following description of the third embodiment, for convenience of explanation, the same members as those in the first embodiment and members having common functions are given the same reference numerals as those in the first embodiment, and detailed explanations will be omitted. In the following description, reference will be made to Figures 1 to 6 as appropriate.

[0121] FIG. 9 is a partial schematic cross-sectional view showing a motor portion according to a third embodiment of the present invention. In this figure, a part of the configuration of the motor unit 3B is omitted, and the rotating shaft 7 is shown in a non-sectional view.

[0122] The motor section 3B includes a housing 5, a motor chamber 6, a rotating shaft 7, a magnet section 8, a pair of annular members 9 and 10, a sleeve 11, a resin material 12, a stator 13, bearings 14 and 15, and a spacer section 16. The large diameter section 71, the magnet section 8, the pair of annular members 9 and 10, the sleeve 11, and the resin material 12 configure the rotor RB in the present invention. That is, the motor section 3B includes the rotor RB. In the third embodiment, the pump device 1 includes the motor section 3B instead of the motor section 3.

[0123] The spacer portions 16 are disposed between adjacent magnets 81-88, between the annular member 9 and the magnet 81, and between the annular member 10 and the magnet 88, forming gaps between them into which the resin material 12 is filled. The spacer portion 16 includes a plurality of spacers 161, 162, 163, 164, 165, 166, 167, 168, and 169 (nine in this embodiment). Each of the spacers 161-169 is an example of the second resin material in the present invention.

[0124] FIG. 10 is a schematic cross-sectional view of the rotor RB taken along line DD in FIG. The figure shows a cross section in a virtual plane including the front surface of the spacer 162 (i.e., the spacer 162 is shown in a non-cross section). For convenience of explanation, the figure shows the front surface of the spacer 162, but the shape of the spacer 162 is common to the other spacers 161, 163 to 169. Therefore, the configuration and shape of the spacer 162 are common to the configuration and shape of the spacers 161, 163 to 169. In the following explanation, FIG. 9 will be referred to as appropriate.

[0125] The spacer 162 is annular and substantially gear-shaped. The spacer 162 is made of, for example, synthetic resin (for example, epoxy resin, polyimide resin). In the radial direction, the spacer 162 is disposed outside the large diameter portion 71. In the axial direction, the spacer 162 is disposed between the magnet 81 and the magnet 82, and abuts against the magnets 81 and 82. The spacer 162 includes an annular main body 200, six teeth 201, 202, 203, 204, 205, and 206, an outer circumferential surface 207, and an inner circumferential surface 208. The teeth 201 to 206 protrude outward from the main body 200 in the radial direction. In the circumferential direction, the teeth 201 to 206 are disposed at equal intervals. The outer circumferential surface 207 is uneven, including the outer periphery of the teeth 201 to 206. The inner diameter of the spacer 162 is larger than the outer diameter of the large diameter portion 71, and the outer diameter of the spacer 162 is smaller than the outer diameter of each of the magnets 81-88 and the outer diameter of the annular members 9 and 10. For ease of explanation, in the following explanation, the "main body portion," "tooth portion," "outer peripheral surface," and "inner peripheral surface" of the other spacers 161, 163-169 are given the same reference numerals as those given to the "main body portion 200," "tooth portions 201-206," "outer peripheral surface 207," and "inner peripheral surface 208" of the spacer 162.

[0126] 10, the spacers 161-169 are disposed between the adjacent magnets 81-88, between the magnet 81 and the annular member 9, and between the magnet 88 and the annular member 10. That is, the spacer 161 is disposed between the magnet 81 and the annular member 9, the spacer 163 is disposed between the magnet 82 and the magnet 83, the spacer 164 is disposed between the magnet 83 and the magnet 84, the spacer 165 is disposed between the magnet 84 and the magnet 85, the spacer 166 is disposed between the magnet 85 and the magnet 86, the spacer 167 is disposed between the magnet 86 and the magnet 87, the spacer 168 is disposed between the magnet 87 and the magnet 88, and the spacer 169 is disposed between the magnet 88 and the annular member 10.

[0127] Furthermore, the spacers 161 to 169 have the same length (thickness) in the axial direction. Therefore, the distances between adjacent magnets 81 to 88, between the magnet 81 and the annular member 9, and between the magnet 88 and the annular member 10 in the axial direction are the same.

[0128] As described above, the configuration and shape of each of the spacers 161, 163 to 169 are common to the configuration and shape of the spacer 162. Therefore, a description of the configuration and shape of each of the spacers 161, 163 to 169 will be omitted.

[0129] Motor section (3) manufacturing process Next, a manufacturing process (manufacturing method) of the motor unit 3B will be described below. In the following description, Fig. 6, Fig. 6 and Fig. 9 will be referred to as appropriate.

[0130] First, the rotating shaft 7, the pair of annular members 9 and 10, the eight magnetic bodies 81 to 88, and the nine spacers 161 to 169 are prepared. The main manufacturing processes for the motor unit 3B include an annular body mounting step, a sleeve mounting step, a resin material filling step, a magnetizing step, an assembly step, and a processing step.

[0131] Next, the annular members, that is, the magnetic bodies 81 to 88, the pair of annular members 9 and 10, and the spacers 161 to 169 are attached to the rotating shaft 7 (annular member attachment step).

[0132] In the annular body attachment step, the large diameter portion 71 is inserted (loosely fitted) alternately from the front into each of the spacers 161 to 169 and each of the magnetic bodies 81 to 88 in a loose fit state. That is, the large diameter portion 71 is inserted into the spacer 161, the magnetic body 81, the spacer 162, the magnetic body 82, ..., the spacer 168, the magnetic body 88, and the spacer 169 in that order.

[0133] In the annular body mounting step, the annular member 10 is attached to the large diameter portion 71 so as to lightly press the magnetic bodies 81-88 and the spacers 161-169 forward. That is, the spacers 161-169 are disposed between the annular member 9 and the magnetic body 81, between the magnetic bodies 81-88, and between the magnetic body 88 and the annular member 10. Therefore, gaps of the thickness of the spacers 161-169 are formed between the annular member 9 and the magnetic body 81, between the adjacent magnetic bodies 81-88, and between the magnetic body 88 and the annular member 10. In addition, gaps are formed between the outer circumferential surface 71a of the large diameter portion 71 and the inner circumferential surfaces 81d-88d of the magnetic bodies 81-88 and the inner circumferential surface 208 of the spacers 161-169.

[0134] Next, a sleeve mounting process and a resin material filling process are performed. In the resin material filling process, the resin material 12 is impregnated (filled) in the grooves 91, 101, between the large diameter portion 71 and each of the magnetic bodies 81 to 88, between adjacent magnetic bodies 81 to 88, between the magnetic body 81 and the annular member 9, between the magnetic body 88 and the annular member 10, between each of the magnetic bodies 81 to 88 and the sleeve 11, and between a part of the annular members 9, 10 and the sleeve 11. That is, the resin material 12 is also in contact with each of the spacers 161 to 169. At this time, due to the influence of the surface tension of the resin material 12, etc., each of the spacers 161 to 169 moves in the radial direction so that the center of each of the spacers 161 to 169 coincides with the center of the rotation shaft 7 (large diameter portion 71) when viewed in the axial direction.

[0135] Thereafter, the resin material 12 is hardened, whereby the magnetic bodies 81-88 and the spacers 161-169 are fixed to the large diameter portion 71, and the sleeve 11 is fixed to the magnetic bodies 81-88, the annular members 9 and 10, and the spacers 161-169.

[0136] Next, the magnetizing step, the assembling step, and the processing step are carried out.

[0137] In the motor section 3B manufactured by such a manufacturing method, similarly to the motor section 3 according to the first embodiment, when centrifugal force is applied, the tensile strength of each of the magnets 81-88 is high and the magnets 81-88 are unlikely to peel off. Furthermore, the rotor diameter can be made small. This reduces energy loss (fluid loss) in the motor chamber 6 and enables the rotor RB to withstand high-speed rotation. This realizes a rotor RB with an SPM structure suitable for high-speed rotation.

[0138] Similarly, the dimensional accuracy required for each of the magnetic bodies (magnets) 81 to 88 is relaxed compared to the dimensional accuracy required for conventional magnets, and therefore assembly of the rotor RB becomes easier than the assembly of conventional rotors.

[0139] Between adjacent magnets 81-88, the spacers 161-169 reliably form gaps into which the resin material 12 can penetrate. Furthermore, the size of the gaps in the axial direction can be adjusted as desired by the thickness of the spacers 161-169. The resin material 12 fills the gaps. That is, in the third embodiment, the resin material 12 having a lower Young's modulus than metal is filled between the magnets 81-88, and the spacers 161-169 are also arranged, so that the distortion force (stress) due to thermal expansion / contraction is further alleviated (absorbed).

[0140] ● Summary (3) According to the third embodiment described above, the motor section 3B provides the same effects as the motor section 3 according to the first embodiment. In addition, the distortion force (stress) caused by thermal expansion / contraction is further mitigated by the resin material 12 and the spacers 161-169.

[0141] According to the third embodiment described above, similarly to the first embodiment, the rotation balance of the rotating shaft 7 can be easily adjusted. The resin material 12 can be filled (impregnated) into the rotor R through the grooves 91, 101, and the magnets 81-88 do not come into contact with the handled liquid in the motor chamber 6.

[0142] Furthermore, according to the embodiment described above, the rotor RB includes a plurality of spacers 162-168 arranged between the adjacent magnets 81-88. Each spacer 162-168 is in contact with the resin material 12. According to this configuration, a gap corresponding to the thickness of the spacer 162-168 can be reliably formed between the adjacent magnets 81-88. Therefore, the resin material 12 is also filled in the gap, and the magnets 81-88 and the spacers 162-168 are integrated by the resin material 12. As a result, the strength of the rotor RB (motor section 3B) is increased. Furthermore, the thickness and shape of each spacer 161-169 can be adjusted as desired. Therefore, the position and amount of the resin material 12 filled between the magnets 81-88 can also be adjusted as desired.

[0143] In the third embodiment, the shape of each of the spacers 161-169 is not limited to a gear shape, so long as a predetermined gap can be secured between adjacent magnets 81-88, between the magnet 81 and the annular member 9, and between the magnet 88 and the annular member 10. That is, for example, each of the spacers 161-169 does not need to include the teeth 201-206. In this case, the shape of each of the spacers 161-169 may be annular, constituted only by a main body 200 as shown in FIG. 3, or another polygonal shape.

[0144] In the third embodiment, the thickness of each spacer 161-169 may be different. In other words, the intervals between adjacent magnets 81-88, between the magnet 81 and the annular member 9, and between the magnet 88 and the annular member 10 may be different. That is, the thickness of each spacer 161-169 may be appropriately determined according to the thermal expansion / contraction occurring between the large diameter portion 71 and the magnet portion 8. That is, for example, the thickness of each spacer 161-169 may be configured to be thicker from the center of the core portion toward the end of the core portion in the axial direction. As described above, due to the difference in the amount of thermal expansion / contraction between the large diameter portion 71 and the magnet portion 8, the distortion force (stress) due to the difference in the amount of thermal expansion / contraction in the axial direction becomes larger the further away from the center. With this configuration, each spacer 161-169 can absorb stress more than the spacers 161-169 in the third embodiment.

[0145] ●Motor section (4)● ● Motor section (4) configuration Next, still another embodiment (hereinafter referred to as the "fourth embodiment") of the rotating electric machine (motor section) according to the present invention will be described below, focusing on the differences from the first embodiment. The motor section according to the fourth embodiment differs from the first embodiment in that it is provided with a filament material. In the following description of the fourth embodiment, for convenience of explanation, the same members as those in the first embodiment and members having common functions are given the same reference numerals as those in the first embodiment, and detailed explanations will be omitted. In the following description, reference will be made as appropriate to Figures 1 to 6.

[0146] FIG. 11 is a partial schematic cross-sectional view showing a motor portion according to a fourth embodiment of the present invention. In the figure, a part of the configuration of the motor unit 3E is omitted, and the rotating shaft 7 is shown in a non-sectional view. FIG. 12 is a partially enlarged schematic cross-sectional view of the motor unit 3E shown in FIG.

[0147] The motor section 3E includes a housing 5, a motor chamber 6, a rotating shaft 7, a magnet section 8 (magnets 81-88), a pair of annular members 9E, 10E, a sleeve 11, a resin material 12, a stator 13, bearings 14, 15, and a filament material 17. The large diameter section 71, the magnet section 8, the pair of annular members 9E, 10E, the sleeve 11, the resin material 12, and the filament material 17 configure a rotor RE in this modification. That is, the motor section 3E includes a rotor RE. In this modification, the pump device 1 includes a motor section 3E instead of the motor section 3.

[0148] The annular member 9E includes a step 93 for accommodating the filament material 17. The step 93 is formed by cutting a rear portion of the outer circumferential surface 9c of the annular member 9E into a ring shape. The step 93 is covered with a sleeve 11 and a resin material 12.

[0149] The annular member 10E includes a step 103 for accommodating the filament material 17. The step 103 is formed by cutting a front portion of the outer circumferential surface 10c of the annular member 10E into a ring shape. The step 103 is covered with a sleeve 11 and a resin material 12.

[0150] The filament material 17 is wound around the magnets 81-88 and the annular members 9E, 10E so as to cover the outer circumferential surface of the magnet section 8 and the stepped portions 93, 103. The filament material 17 is, for example, a carbon thread having high tensile strength.

[0151] In addition to the gaps described in the first embodiment, the resin material 12 is filled between the filament material 17, between the magnets 81-88 and the filament material 17, between the annular members 9E, 10E and the filament material 17, and between the sleeve 11 and the filament material 17. In other words, the resin material 12 is filled between the filament material 17 so as to encapsulate (contain) the wound filament material 17. As a result, the wound filament material 17, together with the resin material 12, constitutes a resin layer highly reinforced by the filament material 17, that is, a CFRP (Carbon Fiber Reinforced Plastics) layer. The hardened resin material 12 and the filament material 17 cover the outer peripheral surface of the magnet portion 8 and the step portions 93, 103. Therefore, the strength of the rotor RE is higher than that of the rotor R in the first embodiment.

[0152] Manufacturing process for motor part (4) Next, a manufacturing process (manufacturing method) of the motor unit 3E will be described below. In the following description, Figures 6, 11 and 12 will be referred to as appropriate.

[0153] The main manufacturing steps (manufacturing method) of the motor unit 3E include an annular body mounting step, a winding step, a sleeve mounting step, a resin material filling step, a magnetizing step, an assembly step, and a processing step.

[0154] First, an annular body attachment step is performed. Next, the filament material 17 is wound around the step portions 93, 103 of the pair of annular members 9E, 10E and the outer circumferential surfaces 81c-88c of the magnetic bodies 81-88 (winding step). The winding of the filament material 17 is performed, for example, by a known filament winding method.

[0155] Next, a sleeve attachment step, a resin filling step, a magnetization step, an assembly step, and a processing step are carried out.

[0156] As described above, in the resin filling process, in addition to the gaps described in the first embodiment, resin is filled between the filament material 17, between each of the magnets 81-88 and the filament material 17, between the annular members 9E, 10E and the filament material 17, and between the sleeve 11 and the filament material 17.

[0157] In the motor section 3E manufactured by such a manufacturing method, the magnets 81-88 are protected by the CFRP layer more firmly than in the motor section 3 according to the first embodiment, so that the magnets 81-88 are even less likely to peel off. And, as described below, the thickness of the sleeve 11 is reduced or the sleeve 11 is not required, so that the rotor diameter can be further reduced. This reduces energy loss (fluid loss) in the motor chamber 6, and the rotor RE can withstand high-speed rotation. Thus, a rotor RE with an SPM structure suitable for high-speed rotation is realized.

[0158] Similarly, the dimensional accuracy required for each of the magnetic bodies (magnets) 81 to 88 is less stringent than that required for conventional magnets, and therefore assembly of the rotor RC is easier than assembling a conventional rotor.

[0159] Resin material 12 is filled between adjacent magnets 81 to 88. Therefore, the resin material 12 reduces (absorbs) distortion force (stress) caused by thermal expansion / contraction.

[0160] ●Summary (4) According to the fourth embodiment described above, the motor section 3E provides the same effects as the motor section 3 according to the first embodiment.

[0161] According to the fourth embodiment described above, the rotor RE includes the filament material 17 wound around the magnets 81-88 so as to cover the outer circumferential surfaces 81c-88c of the magnets 81-88. The resin material 12 is filled between each magnet 81-88 and the wound filament material 17. According to this configuration, the outer circumferential surfaces 81c-88c and the step portions 93, 103 of each magnet 81-88 are covered with a CFRP layer. Therefore, the strength of the rotor RE is higher than that of the rotor R in the first embodiment. Also, since each magnet 81-88 is protected by a CFRP layer, the need for the sleeve 11 is lower than in the first embodiment. Therefore, the thickness of the sleeve 11 can be further reduced, and a configuration in which the rotor RE does not include the sleeve 11 is also acceptable (the sleeve 11 is unnecessary).

[0162] In the fourth embodiment, the manufacturing process of the motor unit 3E may further include a resin material cutting step in which the outer peripheral surface of the portion of the resin material 12 constituting the CFRP layer is cut into a cylindrical shape. In this case, the resin material filling step is performed after the winding step, the resin material cutting step is performed after the winding step, and the sleeve attachment step is performed after the winding step. Furthermore, the resin material filling step is performed again after the sleeve attachment step. Also, if the manufacturing process of the motor unit 3E includes the resin material cutting step, the rotor RE may be press-fitted into the sleeve 11. In this case, the second resin material filling step is unnecessary.

[0163] In the fourth embodiment, if the strength of the rotor RE is sufficiently ensured by winding the filament material 17, the motor unit 3E may not include the sleeve 11. In this case, after the resin material filling step, the outer peripheral surface of the portion of the resin material 12 that constitutes the CFRP layer is cut to match the outer peripheral surfaces 9c, 10c of the annular members 9E, 10E.

[0164] ●Other embodiments● In the present invention, the pumped liquid used in the pump device 1 may be cryogenic liquid hydrogen or a high-temperature liquid. The magnet section 8 is not exposed to the outside because it is entirely covered (protected) by the resin material 12. Therefore, the magnet section 8 does not come into contact with the pumped liquid in the motor chamber 6 which is filled with the pumped liquid. As a result, the magnet section 8 is not damaged (has no effect on the magnet section 8) by the pumped liquid.

[0165] Furthermore, in the present invention, the core portion does not have to be configured by the large diameter portion 71. That is, for example, the core portion may be configured separately from the rotating shaft 7. In this case, in the axial direction, the rotating shaft 7 may be configured by a cylindrical shaft portion having the same diameter, and the core portion may be configured by a cylindrical iron core through which the rotating shaft 7 is inserted. That is, the rotors R to RE may each have a core portion.

[0166] Furthermore, in the present invention, instead of the annular member 9, 10, 9E, 10E, or together with the annular member 9, 10, 9E, 10E, the large diameter portion 71 may be provided with a groove. In this case, the groove provided in the large diameter portion 71 is disposed on the outer circumferential surface 71a of the large diameter portion 71 and is formed so as to communicate with the front side and the rear side of the annular member 9, 10, 9E, 10E.

[0167] Furthermore, in the present invention, the large diameter portion 71 does not have to be press-fitted into the annular member 9, 10, 9E, 10E. That is, for example, the inner diameter of the annular member 9, 10, 9E, 10E may be configured to be larger than the outer diameter of the large diameter portion 71, and the large diameter portion 71 may be loosely fitted into the annular member 9, 10, 9E, 10E by clearance fit. In this case, the resin material 12 can infiltrate into the rotors R to RE through the clearance formed between the annular member 9, 10, 9E, 10E and the large diameter portion 71, and therefore the grooves 91, 101 of the annular member 9, 10, 9E, 10E are not necessary.

[0168] Furthermore, in the present invention, the groove portion 91 does not have to be disposed along the axial direction as long as it communicates with the front side (one direction side) and the rear side (the other direction side) of the annular member 9. Moreover, the shape of the groove portion 91 as viewed in the axial direction is not limited to a substantially semicircular shape.

[0169] Furthermore, in the present invention, the housing 5 does not necessarily have to be provided with the liquid inlets 51, 52. In this case, for example, the pumped liquid may be introduced into the pump chamber 22 and the motor chamber 6 by passing through the bearings 14, 15.

[0170] Furthermore, in the present invention, the magnets 81-88 are seamless circular rings. Therefore, the magnets 81-88 are less likely to peel off due to the centrifugal force that accompanies the rotation of the rotating shaft 7, and the magnets 81-88 are less likely to fly off. Therefore, the motor sections 3-3B do not need to be provided with the sleeve 11.

[0171] Furthermore, the configurations of the respective embodiments can be combined with each other as long as the present invention is established. That is, for example, the rotors RA and RB may include the filament material 17. Also, for example, the rotor RB may include the resin material 89.

[0172] ●Embodiments of the present invention● Next, the embodiments of the present invention that can be understood from the above-described embodiments will be described below, using the terms and symbols described in the respective embodiments.

[0173] A first embodiment of the present invention is a rotating electric machine (e.g., motor sections 3 to 3E) comprising a rotor (e.g., rotors R to RE) and a rotating shaft (e.g., rotating shaft 7) to which rotation of the rotor is transmitted, the rotor or the rotating shaft comprising a core portion (e.g., large diameter section 71) having a cylindrical outer peripheral surface (e.g., outer peripheral surface 71a), the rotor comprising a plurality of magnets (e.g., magnets 81 to 88) fixed to the core portion, and a first resin material (e.g., resin material 12) fixing the plurality of magnets to the core portion, each of the plurality of magnets having a seamless annular shape, each of the plurality of magnets being arranged radially outward of the core portion and arranged along the axial direction of the core portion, and the first resin material being filled between the core portion and the plurality of magnets. With this configuration, the magnets are less likely to peel off or scatter due to the centrifugal force that accompanies the rotation of the rotor. Also, with this configuration, energy loss (fluid loss) due to the resistance (friction) of the handled fluid that contacts the rotor inside the motor chamber is reduced, realizing a rotor suitable for high speed rotation.

[0174] A second embodiment of the present invention is a rotating electric machine according to the first embodiment, wherein the first resin material is filled between adjacent ones of the magnets. According to this configuration, the distortion force (stress) caused by thermal expansion / contraction occurring in each magnet and the large diameter portion is mitigated.

[0175] A third embodiment of the present invention is a rotating electric machine (e.g., motor sections 3A, 3B) in which, in the second embodiment, the rotor is provided with a second resin material (e.g., resin material 89, spacers 161-169) arranged between adjacent magnets, and the second resin material abuts against the first resin material. According to this configuration, the distortion force (stress) caused by thermal expansion / contraction in the axial direction is mitigated (absorbed) by the two resin materials.

[0176] A fourth embodiment of the present invention is a rotating electric machine (e.g., motor section 3A) in which, in the third embodiment, each of the magnets has a first surface (e.g., front surfaces 81a-88a) facing one direction and a second surface (e.g., 81b-88b) facing the other direction in the axial direction, and the second resin material (e.g., resin material 89) is attached to the first surface and the second surface of each of the magnets. According to this configuration, the positions and amounts of the resin material filled between the magnets can be adjusted as desired.

[0177] A fifth embodiment of the present invention is a rotating electric machine (e.g., a motor section 3B) in which, in the third embodiment, the second resin material is constituted by spacers (e.g., spacers 161 to 169) arranged between adjacent magnets. According to this configuration, a gap equivalent to the thickness of the spacer can be reliably formed between adjacent magnets.

[0178] A sixth embodiment of the present invention is a rotating electric machine in which, in the third embodiment, the thickness of the second resin material in the axial direction becomes thicker from the center of the core portion toward the end of the core portion. According to this configuration, the distortion force (stress) caused by thermal expansion / contraction in the axial direction is further alleviated (absorbed).

[0179] A seventh embodiment of the present invention is a rotating electric machine in which, in the first embodiment, the rotor comprises a pair of circular annular members (e.g., annular members 9, 10, 9E, 10E) attached to the core portion, the pair of annular members are arranged to sandwich the multiple magnets in the axial direction, and the pair of annular members are arranged outside the core portion in the circumferential direction, and at least one of the pair of annular members comprises a machined area (e.g., machined area 92) that is machined to adjust the rotational balance of the rotating shaft. According to this configuration, the rotational balance of the rotating shaft can be easily adjusted.

[0180] An eighth embodiment of the present invention is a rotating electric machine in which, in the seventh embodiment, the outer peripheral surface of the core portion abuts against the inner peripheral surfaces (e.g., inner peripheral surfaces 9d, 10d) of each of the pair of annular members, and each of the pair of annular members and / or the core portion has a groove portion (e.g., groove portion 91, 101) arranged on the inner peripheral surface and / or the outer peripheral surface, and the groove portion leads to one direction side (e.g., the front side) and the other direction side (e.g., the rear side) of the annular member. According to this configuration, even if the core portions are press-fitted into the pair of annular members, the resin material can be filled (impregnated) into the inside of the rotor through the grooves.

[0181] A ninth embodiment of the present invention is a rotating electric machine according to the eighth embodiment, wherein the first resin material is filled in the groove portion. According to this configuration, the pumped fluid does not infiltrate into the inside of the rotor through the groove.

[0182] A tenth embodiment of the present invention is a rotating electric machine (e.g., motor section 3E) in which, in the first embodiment, the rotor (e.g., rotor RE) comprises a filament material (e.g., filament material 17) wound around a plurality of magnets so as to cover the outer peripheral surfaces of the plurality of magnets, and the first resin material is filled between the plurality of magnets and the wound filament material. According to this configuration, the CFRP layer is made of the filament material, which further increases the strength of the rotor.

[0183] An eleventh embodiment of the present invention is a rotating electric machine according to the first embodiment, wherein a part of the rotating shaft in the axial direction (for example, a large diameter portion 71) functions as the core portion. With this configuration, the outer diameter of the core portion can be reduced to nearly the outer diameter of the rotating shaft, thereby enabling the rotor diameter to be further reduced.

[0184] A twelfth embodiment of the present invention is a rotating electric machine in which, in any one of the first to eleventh embodiments, the rotor has a cylindrical sleeve (e.g., sleeve 11) arranged to cover the multiple magnets in the circumferential direction, and the first resin material is filled between the multiple magnets and the sleeve. According to this configuration, the multiple magnets are covered and protected by the resin material, and the surface of the magnet portion is also protected by the sleeve.

[0185] A thirteenth embodiment of the present invention is a rotating electric machine in which, in the twelfth embodiment, one end (e.g., front end 11a) of the sleeve covers a portion (e.g., rear half) of one of the pair of annular members (e.g., annular member 9) in the axial direction, and the other end (e.g., rear end 11b) of the sleeve covers a portion (e.g., front half) of the other of the pair of annular members (e.g., annular member 10) in the axial direction. According to this configuration, the portion (front half) of the pair of annular members that is not covered by the sleeve can be a region that can be cut (machined region).

[0186] A fourteenth embodiment of the present invention is a pump device (e.g., pump device 1) comprising a rotating electric machine according to the first embodiment and an impeller (e.g., impeller 4) that rotates due to the rotation of the rotating electric machine. According to this configuration, the pump device is realized as a pump device equipped with a rotor of an SPM structure suitable for high-speed rotation. [Explanation of symbols]

[0187] 1. Pumping equipment 3 Motor section (rotating electric machine) 3A Motor section (rotating motor) 3B Motor section (rotating electric machine) 3E Motor section (rotating electric machine) 7 Rotation Axis 71 Large diameter part (core part) 71a Outer surface 8 Magnet section 8A Magnet section 81~88 Magnets (magnetic materials) 89 Resin material (second resin material) 9,10 Annular member 9E,10E Annular member 9d,10d Inner surface 91,101 Groove (groove) 92 Processing area 11 Sleeve 11a Front end (one end) 11b Rear end (other end) 12 Resin material (first resin material) 16 Spacer part 161~169 Multiple spacers (second resin material) 17 Filament material

Claims

1. A rotor, a rotating shaft to which the rotation of the rotor is transmitted; and The rotor or the rotating shaft includes a core portion having a cylindrical outer peripheral surface, The rotor is A plurality of magnets fixed to the core portion; A first resin material that fixes the plurality of magnets to the core portion; With Each of the magnets has a seamless circular ring shape, Each of the plurality of magnets is The core portion is disposed radially outward of the core portion, The core portion is disposed along the axial direction of the core portion. The first resin material is filled between the core portion and the plurality of magnets. Rotating electric motor.

2. In the axial direction, the first resin material is filled between adjacent magnets. The rotating electric machine according to claim 1 .

3. The rotor includes a second resin material disposed between adjacent magnets, The second resin material abuts against the first resin material. The rotating electric machine according to claim 2 .

4. In the axial direction, each of the magnets is A first surface facing one direction; A second surface facing the other side; With The second resin material is applied to the first surface and the second surface of each of the magnets. The rotating electric machine according to claim 3 .

5. The second resin material is constituted by a spacer disposed between adjacent magnets. The rotating electric machine according to claim 3 .

6. In the axial direction, the thickness of the second resin material is configured to increase from the center of the core portion toward the end of the core portion. The rotating electric machine according to claim 3 .

7. The rotor includes a pair of annular members attached to the core portion, The pair of annular members are disposed in the axial direction so as to sandwich the plurality of magnets therebetween, In the radial direction, the pair of annular members are disposed outwardly of the core portion, At least one of the pair of annular members has a processed region that is processed to adjust the rotation balance of the rotating shaft. The rotating electric machine according to claim 1 .

8. The outer circumferential surface of the core portion abuts against the inner circumferential surfaces of the pair of annular members, Each of the pair of annular members and / or the core portion includes a groove portion disposed on the inner circumferential surface and / or the outer circumferential surface, In the axial direction, the groove portion communicates with one side and the other side of the annular member, The first resin material is filled in the groove portion. The rotating electric machine according to claim 7.

9. the rotor includes a filament material wound around the magnets so as to cover outer circumferential surfaces of the magnets, The first resin material is filled between the magnets and the wound filament material. The rotating electric machine according to claim 1 .

10. In the axial direction, a part of the rotating shaft functions as the core portion. The rotating electric machine according to claim 1 .

11. the rotor includes a cylindrical sleeve disposed in a circumferential direction of the rotation shaft so as to cover the magnets, The first resin material is filled between the plurality of magnets and the sleeve. The rotating electric machine according to any one of claims 1 to 10.

12. In the axial direction, one end of the sleeve covers a portion of one of the pair of annular members, In the axial direction, the other end of the sleeve covers a portion of the other of the pair of annular members. A rotating electric machine according to claim 11 dependent on claim 7.

13. A rotating electric machine according to claim 1 ; an impeller that rotates due to rotation of the rotating electric machine; It is made of Pump equipment.

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