JP2019129636A - Stator, rotating electric machine, and vehicle - Google Patents

Abstract

To provide a stator capable of suitably fixing a core, a rotating electric machine including the stator, and a vehicle using the rotating electric machine.SOLUTION: A stator according to an embodiment includes annular first and second coils, first to third cores, and first to third fixing members. The first core is disposed on the outer peripheral side of the first coil. The second core is disposed between the first and second coils. The third core is disposed on the inner peripheral side of the second coil. Each of the first to third cores has a core main body and a flange that protrudes from the core main body. The first to third fixing members fix the first to third cores in the axial direction by holding the flanges of the first to third cores, respectively.SELECTED DRAWING: Figure 12

Description

  Embodiments described herein relate generally to a stator, a rotating electrical machine, and a vehicle.

  As an example of a rotary electric machine, an axial gap motor is known in which a rotor connected to a shaft and a stator are opposed to each other in the axial direction of the shaft with a gap. The stator includes a coil and a core. When current flows through the coil during operation, the core of the stator is attracted to the permanent magnet of the rotor. That is, since an axial suction force acts on the core, it is necessary to suitably fix the core in the axial direction.

JP 2017-55556 A

  Problem to be solved by the invention is providing the stator which can fix a core suitably, the rotary electric machine provided with the said stator, and the vehicle provided with the said rotary electric machine.

  A stator according to an embodiment includes an annular first coil, an annular second coil, a plurality of first cores, a plurality of second cores, a plurality of third cores, a first fixing member, A second fixing member and a third fixing member are provided. The first coil surrounds the shaft. The second coil surrounds the shaft with a smaller radius than the first coil. The plurality of first cores have a first core body and a first flange projecting from the first core body, and are disposed on the outer peripheral side of the first coil. The plurality of second cores have a second core main body and a second flange projecting from the second core main body, and are disposed between the first coil and the second coil. The plurality of third cores have a third core body and a third flange projecting from the third core body, and are disposed on the inner peripheral side of the second coil. The first fixing member fixes the plurality of first cores in the axial direction by holding the first flange portion of each of the plurality of first cores. The second fixing member fixes the plurality of second cores in the axial direction by holding the second flange portion of each of the plurality of second cores. The third fixing member fixes the plurality of third cores in the axial direction by holding the third flange portion of each of the plurality of third cores.

FIG. 1 is a perspective view showing an appearance of a motor according to a first embodiment. FIG. 2 is a schematic exploded perspective view of the motor. FIG. 3 is a schematic cross-sectional view of the motor. FIG. 4 is a schematic exploded perspective view of a stator provided in the motor. FIG. 5 is a schematic perspective view of a core included in the stator. FIG. 6 is a schematic perspective view showing a manufacturing process of the stator. FIG. 7 is a schematic perspective view showing a manufacturing process of the stator. FIG. 8 is a schematic perspective view showing a manufacturing process of the stator. FIG. 9 is a schematic plan view of the assembled stator. 10 is a schematic cross-sectional view of a stator taken along line F10 of FIG. 11 is a schematic cross-sectional view of the stator taken along line F11 of FIG. 12 is a schematic cross-sectional view of a stator taken along line F12 of FIG. FIG. 13 is a diagram illustrating an application example of a motor. FIG. 14 is a perspective view schematically showing a core and a fixing member in the second embodiment.

Several embodiments will be described with reference to the drawings.
In each embodiment, an axial gap motor is disclosed as an example of a rotating electrical machine. However, a part of the structure shown in each embodiment can be applied to other types of rotating electrical machines.

First Embodiment
FIG. 1 is a perspective view schematically showing an example of an appearance configuration of an axial gap motor M (hereinafter referred to as a motor M) according to a first embodiment.
The motor M includes four housings 10A, 10B, 10C, 10D, three rectangular frames 20A, 20B, 20C, and a shaft S.

  The frame 20A is disposed between the housings 10A and 10B. The frame 20B is disposed between the housings 10B and 10C. The frame 20C is disposed between the housings 10C and 10D. The housing 10A has a cylindrical shape with a bottom, and one open end is connected to the frame 20A. The housing 10B is cylindrical, and one end is connected to the frame 20A and the other end is connected to the frame 20B. The housing 10C is cylindrical, and one end is connected to the frame 20B and the other end is connected to the frame 20C. The housing 10D has a bottomed cylindrical shape, and one open end is connected to the frame 20C.

  The shaft S is passed through the housings 10A to 10D and the frames 20A to 20C. For example, the shaft S is rotatably supported by the housings 10A and 10D via bearings.

  Through holes H are provided at the four corner portions of the frames 20A to 20C. The motor M can be fixed to the installation location using these through holes H. Although FIG. 1 shows a state in which the through holes H below the frames 20A and 20C are connected to the fixture F at the installation location, the method of installing the motor M is not limited to this.

FIG. 2 is a schematic exploded perspective view of the motor M. FIG.
Here, illustration of the housings 10A to 10D is omitted. The motor M includes a rotor 1A housed in the housing 10A, a rotor 1B housed in the housing 10B, a rotor 1C housed in the housing 10C, and a rotor 1D housed in the housing 10D. Yes. Further, the motor M includes a stator 2A fixed to the frame 20A, a stator 2B fixed to the frame 20B, and a stator 2C fixed to the frame 20C.

  The shaft S is passed through the centers of the rotors 1A to 1D and the stators 2A to 2C. The rotors 1A to 1D are attached to the shaft S. Thereby, along the rotation axis AX of the shaft S, the rotor 1A, the stator 2A, the rotor 1B, the stator 2B, the rotor 1C, the stator 2C, and the rotor 1D are sequentially arranged via a gap.

  The rotors 1 </ b> A to 1 </ b> D include a disk-shaped support plate 11, a plurality of permanent magnets 12, and a plurality of cores 13. The core 13 is, for example, a dust core obtained by compressing and solidifying a ferromagnetic powder such as iron. The permanent magnet 12 and the core 13 have a long shape extending radially about the rotation axis AX, and are alternately arranged in the circumferential direction about the rotation axis AX. In the rotor 1A, the permanent magnet 12 and the core 13 are disposed only on one surface of the support plate 11 facing the stator 2A. In the rotors 1B and 1C, permanent magnets 12 and cores 13 are disposed on both sides of the support plate 11. In the rotor 1D, the permanent magnet 12 and the core 13 are disposed only on one surface of the support plate 11 opposed to the stator 2C.

FIG. 3 is a schematic cross-sectional view of the motor M.
Here, only a part of the rotors 1A and 1B and the stator 2A and the shaft S are shown, and other elements are not shown. The stator 2 </ b> A includes a first support plate 3 and a second support plate 4. Each of the support plates 3 and 4 is preferably formed of a nonmagnetic and nonconductive material. For example, each support plate 3, 4 can be formed of fiber reinforced plastic (FRP). Moreover, each support plate 3 and 4 can also be formed with a ceramic material. Since the ceramic material is excellent in thermal conductivity, heat radiation from the stators 2A to 2C is facilitated, which contributes to reducing the size and weight of the motor M and increasing the output.

  Further, the stator 2A includes a first core 81 disposed between the support plates 3 and 4, a second core 82, a third core 83, a first coil 91, and a second coil 92. ing. The first core 81, the second core 82, and the third core 83 are arranged in order toward the rotation axis AX. The first coil 91 is disposed between the first core 81 and the second core 82, and the second coil 92 is disposed between the second core 82 and the third core 83. The side surfaces of each of the cores 81 to 83 are exposed from each of the support plates 3 and 4 so as to face the rotors 1A and 1B.

  When current flows through the coils 91 and 92, magnetic flux is generated around the coils 91 and 92 as indicated by the broken lines and arrows. The magnetic flux passing through each of the cores 81 to 83 is substantially parallel to the rotation axis AX. These magnetic fluxes act on the permanent magnets 12 of the rotors 1A and 1B, and the rotors 1A and 1B and the shaft S rotate.

  A similar magnetic flux is generated in the stators 2B and 2C. That is, the motor M of the present embodiment has three layers of a structure in which a stator is disposed between two rotors. Three-phase alternating current is supplied to each of the coils 91 and 92 of the stators 2A to 2C.

Subsequently, the details of the stator 2A will be described with reference to FIGS. Since the stators 2B and 2C have the same structure as the stator 2A, the description thereof is omitted.
FIG. 4 is a schematic exploded perspective view of the stator 2A.
The stator 2A includes the first support plate 3, the second support plate 4, the plurality of first cores 81, the plurality of second cores 82, the plurality of third cores 83, the first coil 91, and the second coil 92 described above. I have. Furthermore, the stator 2A includes first pressing members 5A and 5B, second pressing members 6A and 6B, and third pressing members 7A and 7B. These pressing members are preferably formed of nonmagnetic and nonconductive materials, and can be formed of, for example, various plastics.

  In the present embodiment, the first pressing members 5A and 5B constitute a first fixing member 5 for fixing the plurality of first cores 81. The second pressing members 6 </ b> A and 6 </ b> B constitute the second fixing member 6 that fixes the plurality of second cores 82. Further, the third presser members 7 </ b> A and 7 </ b> B constitute a third fixing member 7 that fixes the plurality of third cores 83.

  The plurality of first cores 81 are arranged along a first circumference C1 centered on the rotation axis AX. The plurality of second cores 82 are arranged along a second circumference C2 having a radius smaller than the first circumference C1 about the rotation axis AX. The plurality of third cores 83 are arranged along a third circumference C3 centered on the rotation axis AX and smaller than the second circumference C2. The arrangement | positioning space | interval in the circumferential direction of the 1st core 81 may be fixed, and may differ in at least one part. The same applies to the second core 82 and the third core 83.

  The first coil 91 and the second coil 92 are annular and are arranged concentrically around the rotation axis AX. The radius of the second coil 92 is smaller than the radius of the first coil 91. The first coil 91 and the second coil 92 are configured by winding a wire in the circumferential direction around the rotation axis AX. In each of the first coil 91 and the second coil 92, for example, the strands are flat in the axial direction, and are stacked in a plurality of stages in the axial direction parallel to the rotational axis AX and in the radial direction about the rotational axis AX.

  The first support plate 3 is circular around the rotation axis AX, and has a first surface F1, a second surface F2 opposite to the first surface F1, and a circular central opening 30 for passing the shaft S. A plurality of first core openings 31 corresponding to the first core 81, a plurality of second core openings 32 corresponding to the second core 82, and a plurality of third core openings 33 corresponding to the third core 83 doing. Furthermore, the first support plate 3 has a plurality of holes 34 provided along the outer peripheral edge, a plurality of holes 35 provided along the central opening 30, and at least two positioning holes 36. . Each of the openings 30 to 33 and the holes 34 to 36 penetrates from the first surface F1 to the second surface F2.

  The second support plate 4 has substantially the same shape as the first support plate 3, and includes a third surface F 3 that faces the first surface F 1, a fourth surface F 4 that is opposite to the third surface F 3, and a central opening 40. A plurality of first core openings 41, a plurality of second core openings 42, and a plurality of third core openings 43. Furthermore, the second support plate 4 includes a plurality of holes 44 provided along the outer peripheral edge, a plurality of holes 45 provided along the central opening 40, and a slit for drawing the wire of the second coil 92. 46 and at least two positioning holes 47. Each of the openings 40 to 43 and the holes 44, 45, and 47 penetrates from the first surface F1 to the second surface F2.

  The first pressing members 5A and 5B are, for example, annular, and have a plurality of first holding portions 50 aligned at the same pitch as the plurality of first cores 81 on the inner circumferential side. Further, each of the first pressing members 5A and 5B includes a plurality of holes 51 provided in each first holding portion 50, a plurality of holes 52 provided along the outer peripheral edge, and at least two positioning holes 53. Have. A female screw is provided in the hole 51 of the first pressing member 5A.

  The plurality of second pressing members 6 </ b> A and 6 </ b> B are arranged in a ring at the same pitch as the plurality of second cores 82. The second pressing members 6 </ b> A and 6 </ b> B have holes 61. A female screw is provided in the hole 61 of the second pressing member 6A.

  The third pressing members 7A and 7B have, for example, an annular shape, and have a plurality of second holding portions 70 aligned at the same pitch as the plurality of third cores 83 on the outer peripheral side. Further, the third pressing members 7A and 7B have a plurality of holes 72 provided in the respective second holding portions 70, and a plurality of holes 72 provided along the inner peripheral edge. A female screw is provided in the hole 71 of the third pressing member 7A.

  The frame 20 </ b> A has a circular opening 21 having a diameter smaller than the outer diameter of each of the support plates 3 and 4. The frame 20A also has an annular step 22 at the periphery of the opening 21. The step portion 22 is provided on both the first support plate 3 side and the second support plate 4 side. Furthermore, the frame 20A has a plurality of holes 23 provided in the step portion 22 and at least two positioning holes 24.

  Each of the above-mentioned circumferences C1 to C3, the outer peripheries of the support plates 3 and 4, the center openings 30 and 40, the opening 21 of the frame 20, the coils 91 and 92, and the like are concentric around the rotation axis AX. .

FIG. 5 is a schematic perspective view of the first core 81.
The second core 82 and the third core 83 have the same shape as the first core 81. In FIG. 5, the reference numerals of the respective parts of the second core 82 and the third core 83 corresponding to the reference numerals of the respective parts of the first core 81 are shown in parentheses. In the figure, X is an axial direction parallel to the rotation axis AX, R is a radial direction centered on the rotation axis AX, and C is a circumferential direction centered on the rotation axis AX.

  The first core 81 has a core body 81a and a pair of flange portions 81b. The core body 81a is a rectangular parallelepiped, for example. The pair of flange portions 81b protrude from both side surfaces F11 and F12 in the circumferential direction C of the core body 81a. In the example of FIG. 4, each of the pair of flanges 81 b is provided over the entire distance between the ends in the radial direction R of the side surfaces F <b> 11 and F <b> 12. That is, the width in the radial direction R of the flange portion 81b matches the width in the radial direction R of the core body 81a. The width in the circumferential direction C of the flange portion 81 b is smaller than the width in the circumferential direction C of the core main body 81 a.

  The first core 81 can be configured of a plurality of electromagnetic steel plates 810 stacked in a direction (radial direction R) perpendicular to the rotation axis AX. The electromagnetic steel sheet 810 has a first portion 810a corresponding to the core body 81a and a pair of second portions 810b corresponding to the flange portions 81b. The electrical steel sheet 810 is a grain-oriented electrical steel sheet having excellent electromagnetic characteristics in the rolling direction (easy magnetization direction) D. The rolling direction D is parallel to the axial direction X, for example. In this case, the rolling direction D coincides with the direction of the magnetic flux passing through the first core 81 shown in FIG.

  The laminated electromagnetic steel plates 810 can be fixed to each other at the ridges 81 b (second portions 810 b). For example, the electromagnetic steel plates 810 may be fixed by caulking or hammering at a pair of fixing positions 81c overlapping the respective ridges 81b. Since the core body 81a is not deformed if the electromagnetic steel plates 810 are fixed by the flanges 81b, the electromagnetic characteristics of the core body 81a can be maintained well.

  The laminated electromagnetic steel plates 810 may be fixed by an adhesive or may be fixed by impregnating the resin and then curing the resin. In these cases, since the electromagnetic steel sheet 810 is not deformed, the electromagnetic characteristics of the first core 81 are improved overall. The laminated electromagnetic steel plates 810 can also be fixed by welding. In this case, the first core 81 can be easily manufactured.

  Similar to the first core 81, the second core 82 includes, for example, a rectangular parallelepiped core body 82a, and a pair of flanges 82b projecting from both side faces F21 and F22 in the circumferential direction C of the core body 82a. Each of the pair of flange portions 82b is provided over the entire area between both ends in the radial direction R of the side surfaces F21 and F22. That is, the width in the radial direction R of the flange portion 82b matches the width in the radial direction R of the core body 82a. The width in the circumferential direction C of the flange portion 82b is smaller than the width in the circumferential direction C of the core main body 82a.

  Similar to the first core 81, the second core 82 can be configured of a plurality of electromagnetic steel plates 820 stacked in the radial direction R. The electromagnetic steel plate 820 includes a first portion 820a corresponding to the core body 82a and a pair of second portions 820b corresponding to the flange portions 82b. The electromagnetic steel plate 820 is a grain-oriented electromagnetic steel plate, and the rolling direction D thereof is parallel to the axial direction X. The laminated electromagnetic steel plates 820 can be fixed by caulking or hammering, for example, at a pair of fixing positions 82c overlapping with the flange portions 82b. In addition, the various methods described above for the electromagnetic steel sheet 810 can be applied to the fixing of the electromagnetic steel sheet 820.

  Similar to the first core 81, the third core 83 includes, for example, a rectangular parallelepiped core body 83a, and a pair of flanges 83b protruding from both side faces F31 and F32 in the circumferential direction C of the core body 83a. Each of the pair of flanges 83b is provided over the entire area between both ends in the radial direction R of the side surfaces F31 and F32. That is, the width in the radial direction R of the flange portion 83b matches the width in the radial direction R of the core body 83a. The width of the collar portion 83b in the circumferential direction C is smaller than the width of the core body 83a in the circumferential direction C.

  Similar to the first core 81, the third core 83 can be configured of a plurality of electromagnetic steel plates 830 stacked in the radial direction R. The electromagnetic steel sheet 830 has a first portion 830a corresponding to the core main body 83a and a pair of second portions 830b corresponding to the respective ridges 83b. The electromagnetic steel plate 830 is a grain-oriented electromagnetic steel plate, and the rolling direction D thereof is parallel to the axial direction X. The laminated electromagnetic steel plates 830 can be fixed, for example, by caulking or hammering at a pair of fixing positions 83c overlapping the respective ridges 83b. In addition, various methods described above for the electromagnetic steel sheet 810 can be applied to the fixation of the electromagnetic steel sheet 830.

  In addition, the rolling direction D of the electromagnetic steel sheets 810, 820, and 830 does not need to exactly coincide with the axial direction X, and may intersect the axial direction X at a certain acute angle. In FIG. 5, a rolling direction D parallel to the axial direction X is shown. For example, the rolling direction D can be determined within a range not exceeding an angle θ1 formed by the diagonal line L1 of the first portion 810a and the axial direction X and an angle θ2 formed by the diagonal line L2 and the axial direction X.

  The electromagnetic steel plates 810, 820, and 830 may be non-oriented electrical steel plates. Each of the cores 81 to 83 may be a dust core obtained by compressing and solidifying a powder of a ferromagnetic material such as iron. When a dust core is used as each of the cores 81 to 83, for example, the iron loss when the motor M is driven with an alternating current in a high frequency region can be reduced.

An example of the assembly procedure (manufacturing method) of the stator 2A will be described with reference to the perspective views of FIG. 4 and FIGS.
FIG. 6 is a schematic perspective view showing the stator 2A in the process of assembly.
First, at least two positioning pins P are passed through the positioning holes 36 (see FIG. 4) of the first support plate 3 and the positioning holes 53 of the first pressing member 5A. At this time, each first core opening 31 of the first support plate 3 is positioned between each first holding portion 50 of the first pressing member 5A.

  Next, the third pressing member 7A is disposed on the first support plate 3 so that the third core opening 33 of the first support plate 3 is positioned between the second holding portions 70 of the third pressing member 7A. To do. Further, a plurality of second pressing members 6 </ b> A are arranged between the second core openings 32 of the first support plate 3.

  Next, the core body 81 a of the first core 81 is inserted between the first holding portions 50 of the first pressing member 5 A and the first core opening 31 of the first support plate 3. Further, the core body 82 a of the second core 82 is inserted between the adjacent second pressing members 6 A and into the second core opening 32 of the first support plate 3. Further, the core body 83 a of the third core 83 is inserted between the second holding portions 70 of the third pressing member 7 A and the third core opening 33 of the first support plate 3.

  Further, the second pressing member 6B is disposed between the adjacent second cores 82, respectively. Each flange portion 82b of the second core 82 is interposed between the second pressing members 6A and 6B. In addition, the third pressing member 7B is disposed so that the core main body 83a is inserted between the second holding portions 70 of the third pressing member 7B. Each flange 83b of the third core 83 is interposed between the second holding portions 70 of both the third pressing members 7A and 7B.

FIG. 7 is a schematic perspective view showing an assembly procedure subsequent to FIG. 6 of the stator 2A.
The frame 20 </ b> A is arranged through the positioning pin P in the positioning hole 24. The first pressing member 5A contacts the stepped portion 22 on the back side of the illustrated frame 20A. The holding members 6A, 6B, 7A, 7B and the cores 81 to 83 are accommodated in the opening 21 of the frame 20A.

  After the frame 20A is disposed, the first coil 91 is disposed between the plurality of first cores 81 and the plurality of second cores 82. Further, the first pressing member 5B is disposed through the positioning pin P in the positioning hole 53. At this time, the core body 81a is inserted between the first holding portions 50 of the first pressing member 5B. The first pressing member 5B contacts the step portion 22 of the frame 20A.

  After the first pressing member 5 </ b> B is disposed, the second coil 92 is disposed between the plurality of second cores 82 and the plurality of third cores 83. The two lead portions 91a of the strands of the first coil 91 and the two lead portions 92a of the strands of the second coil 92 are drawn out of the frame 20A through holes provided in the frame 20A, for example.

  After arranging the coils 91 and 92, the screw S1 is inserted into each hole 51 of the first pressing member 5B, and the tip end thereof is screwed into the female screw of each hole 51 of the first pressing member 5A. , 5B (see FIG. 11 described later). Further, the screw S2 is inserted into the hole 61 of the second pressing member 6B, and the tip of the screw S2 is screwed into the female screw of the hole 61 of the second pressing member 6A, thereby connecting the second pressing members 6A and 6B (see also FIG. 11) ). Also, insert the screw S3 into each hole 71 of the third pressing member 7B and screw the tip thereof into the female screw of each hole 71 of the third pressing member 7A to connect the third pressing members 7A and 7B (also see FIG. 11). In FIG. 7, only one screw S1 to S3 is shown.

FIG. 8 is a schematic perspective view showing an assembly procedure subsequent to FIG. 7 of the stator 2A.
The second support plate 4 is disposed in the positioning hole 47 through the positioning pin P. At this time, the core main body 81 a of the first core 81 is inserted into the first core opening 41, the core main body 82 a of the second core 82 is inserted into the second core opening 42, and the third core 83 is inserted into the third core opening 43. The core body 83a is inserted. The lead portion 92 a of the second coil 92 is received in the slit 46.

  The first support plate 3 and the second support plate 4 are fixed to each other by, for example, a plurality of sets of bolts B1 and nuts N1 and a plurality of sets of bolts B2 and nuts N2. In FIG. 8, only one set of the bolt B1 and the nut N1, and the bolt B2 and the nut N2 is shown. The bolt B1 is passed through the hole 34 of the first support plate 3, the hole 52 of the first pressing member 5A, the hole 23 of the frame 20A, the hole 52 of the first pressing member 5B, and the hole 44 of the second support plate 4 in this order. It is screwed into the nut N1 on the side of the second support plate 4 (see FIG. 10 described later). The bolt B2 is passed through the hole 35 of the first support plate 3, the hole 72 of the third pressing member 7A, the hole 72 of the third pressing member 7B, and the hole 45 of the second support plate 4 in order. Screwed into the nut N2 on the side (see also FIG. 10).

  The stator 2A assembled in this manner may be impregnated, for example, with a thermosetting and insulating resin in a vacuum atmosphere. This resin enters between the first support plate 3 and the second support plate 4 from, for example, the vicinity of the central openings 30 and 40, and fills the gap between adjacent elements in the stator 2A. Before the resin is completely cured, it is preferable to rotate the stator 2 </ b> A while standing in the direction of gravity. Thereby, the resin on the outer surface and the inside of the stator 2A can flow and be equalized, and excess resin can be dropped.

FIG. 9 is a schematic plan view of the assembled stator 2A as viewed from the second support plate 4 side. Here, only half of the stator 2A is shown, and a part of the second support plate 4 is broken.
The positions of the first core 81, the second core 82, and the third core 83 are offset from one another by, for example, an electrical angle of 120 ° in the circumferential direction around the rotation axis AX.

  The first core 81 is located between the first pressing members 5 </ b> A and 5 </ b> B and the first coil 91. The first holding portions 50 of the first pressing members 5A and 5B do not extend further toward the first coil 91 than the first core 81. The second core 82 is located between the coils 91 and 92. The width in the radial direction R of the second pressing members 6 </ b> A and 6 </ b> B is equal to or smaller than the width in the radial direction R of the second core 82. Accordingly, the second pressing members 6A and 6B do not extend from the second core 82 to the first coil 91 side and the second coil 92 side. The third core 83 is located between the third pressing members 7 </ b> A and 7 </ b> B and the second coil 92. The second holding portions 70 of the third pressing members 7A and 7B do not extend to the second coil 92 side from the third core 83.

  In each flange portion 81b of the first core 81, a part of the side of the first coil 91 is exposed from the first pressing member 5B (and the first pressing member 5A). The entire flange 82 b of the second core 82 is in contact with the second pressing member 6 B (and the second pressing member 6 A). Each flange 83 b of the third core 83 has a part on the second coil 92 side exposed from the third pressing member 7 B (and the third pressing member 7 A). In addition, each collar part 81b may contact the 1st press member 5A, 5B as a whole. Similarly, each flange 83b may be in contact with the third presser members 7A and 7B as a whole. In addition, a part of each collar portion 82b may be exposed from the second presser members 6A and 6B.

FIG. 10 is a schematic cross-sectional view of stator 2A along line F10 in FIG.
The support plates 3 and 4 and the first pressing members 5A and 5B are fixed to the frame 20A by the bolts B1 and the nuts N1 described above. Further, the support plates 3 and 4 and the third pressing members 7A and 7B are fixed by the bolts B2 and the nuts N2 described above.

  When the above impregnation treatment is performed, an insulating resin layer 95 is formed inside the stator 2A. The resin layer 95 fills the gaps between the support plates 3 and 4, the pressing members 5 </ b> A, 5 </ b> B, 6 </ b> A, 6 </ b> B, 7 </ b> A and 7 </ b> B, the coils 81 to 83 and the coils 91 and 92. Thereby, each element of the stator 2A can be firmly fixed. In FIG. 10, the resin layer 95 is shown only inside the stator 2A, but the resin is used on the second surface F2 of the first support plate 3, the third surface F3 of the second support plate 4 and the surface of the frame 20A. A layer 95 may be formed.

  In the first core 81, since the core main body 81a is fitted in the first core opening 31 of the first support plate 3 and the first core opening 41 of the second support plate 4, the radial direction R and the radial direction R It is fixed in the circumferential direction C. Similarly, the second core 82 and the third core 83 are also fixed in the radial direction R and the circumferential direction C by the support plates 3 and 4. The core bodies 81a to 83a are exposed to the second surface F2 side of the first support plate 3 from the first core openings 31 to 33, respectively. Furthermore, the core main bodies 81a to 83a are exposed to the fourth surface F4 side of the second support plate 4 from the first core openings 41 to 43, respectively.

  Each of the coils 91 and 92 is supported by the first surface F1 of the first support plate 3 and the third surface F3 of the second support plate 4. Specifically, the coils 91 and 92 are held between the first surface F1 and the third surface F3 and fixed in the axial direction X.

  Between the support plates 3 and 4, the first core 81, the first coil 91, the second core 82, the second coil 92 and the third core 83 are arranged in this order in the radial direction of the respective coils 91 and 92. Yes. In the present embodiment, since the coils 91 and 92 are concentric with the rotation axis AX as the center, the radial direction of the coils 91 and 92 coincides with the radial direction R with the rotation axis AX as the center.

FIG. 11 is a schematic cross-sectional view of stator 2A along line F11 in FIG.
As described above, the first pressing members 5A and 5B are connected by the screw S1, the second pressing members 6A and 6B are connected by the screw S2, and the third pressing members 7A and 7B are connected by the screw S3. In the illustrated example, counterbore is provided in each of the hole 51 of the first pressing member 5B, the hole 61 of the second pressing member 6B and the hole 71 of the third pressing member 7B, and the head of the screws S1 to S3 is contained in the counterbore. Is housed.

FIG. 12 is a schematic cross-sectional view of stator 2A taken along line F12 in FIG.
This cross-sectional view includes the first core 81 and the first pressing members 5A and 5B. The cross section including the second core 82 and the second pressing members 6A and 6B and the cross section including the third core 83 and the third pressing members 7A and 7B are the same as the cross sections illustrated. 12, the reference numerals of the respective parts of the second core 82 and the second holding members 6A, 6B corresponding to the reference numerals of the respective parts of the first core 81 and the holding members 5A, 5B, and the third core 83 and the third holding member The reference numerals of 7A and 7B are shown in parentheses.

  The flanges 81b of the first core 81 are held by the first holding portions 50 of the first pressing members 5A and 5B. Thereby, the first core 81 is fixed in the axial direction X. Further, the first pressing members 5A and 5B are held by the support plates 3 and 4, respectively. That is, the first core 81 is supported by the first surface F1 and the third surface F3 via the first pressing members 5A and 5B.

  The flanges 82b of the second core 82 are held by the second pressing members 6A and 6B. Thereby, the second core 82 is fixed in the axial direction X. The second pressing members 6A and 6B are held by the support plates 3 and 4, respectively. That is, the second core 82 is supported by the first surface F1 and the third surface F3 via the second pressing members 6A and 6B.

  Each collar portion 83b of the third core 83 is held by the second holding portion 70 of each of the third pressing members 7A and 7B. Thereby, the second core 82 is fixed in the axial direction X. The third pressing members 7A and 7B are held by the support plates 3 and 4, respectively. That is, the third core 83 is supported by the first surface F1 and the third surface F3 via the third pressing members 7A and 7B.

FIG. 13 is a diagram illustrating an application example of the motor M according to the present embodiment.
The motor M can be applied to the main motor of the railway vehicle 100. The railway vehicle 100 includes a vehicle body 110, a bogie 120 disposed below the vehicle body 110, a drive device 130, and a pantograph 140 disposed above the vehicle body 110. In the illustrated example, two carriages 120 and two pantographs 140 are provided for the vehicle body 110, and two drive devices 130 are provided for each carriage 120. However, the present invention is not limited to this example.

The carriage 120 includes a carriage frame 121, a plurality of wheels 122 attached to the carriage frame 121, and an air spring 123 disposed between the carriage frame 121 and the vehicle body 110. The drive device 130 includes a motor M as a main motor. Furthermore, the driving device 130 includes a control device that controls the motor M. Wheels 122 are directly connected to both sides of the shaft S of the motor M, respectively. The pantograph 140 is in contact with the overhead line 150. The electric power taken in from the overhead wire 150 via the pantograph 140 is supplied to the drive device 130, and the electric power rotates the motor M.
In a configuration in which the wheels 122 are directly connected to both sides of the shaft S, power transmission loss is suppressed and energy efficiency is improved as compared with a configuration in which the wheels 122 are coupled to the shaft S via a transmission device having gears and the like. In addition, the railway vehicle 100 can be miniaturized.
Note that the motor M according to the present embodiment can be applied not only to railway vehicles but also to various vehicles. Besides the vehicle, the motor M can be applied to various devices that require rotational power.

  In the stator 2 (2A to 2C) of the present embodiment described above, the first core 81 has a pair of flanges 81b protruding in the circumferential direction C, and the flanges 81b are a pair of first pressing members 5A. , 5B. With such a structure, the first core 81 can be suitably fixed in the axial direction X. Similarly, the second core 82 and the third core 83 can be suitably fixed in the axial direction X by the second pressing members 6A and 6B and the third pressing members 7A and 7B, respectively.

  Further, the first core 81 is located between the first pressing members 5A, 5B and the first coil 91, and the flange portion 81b is held by the first holding portions 50 of the first pressing members 5A, 5B. With such a structure, it is not necessary to arrange the first pressing members 5A and 5B between the first core 81 and the first coil 91, so a large arrangement space for the first coil 91 can be secured. As a result, the number of turns of the first coil 91 can be increased, and a strong magnetic flux can be generated around the first coil 91.

  The second pressing members 6A and 6B are respectively disposed between the second cores 82 adjacent in the circumferential direction C. With such a structure, the second pressing members 6A and 6B can be arranged without protruding in the radial direction R from the arrangement of the second cores 82, and the arrangement space of the coils 91 and 92 is increased. It can be secured. As a result, the number of windings of the wires of the coils 91 and 92 can be increased, and a strong magnetic flux can be generated around the coils 91 and 92.

  Further, the third core 83 is positioned between the third pressing members 7A and 7B and the second coil 92, and the flange portion 83b is held by the second holding portions 70 of the third pressing members 7A and 7B. With such a structure, it is not necessary to arrange the third pressing members 7A and 7B between the third core 83 and the second coil 92, so that a large arrangement space for the second coil 92 can be secured. As a result, the number of turns of the second coil 92 can be further increased, and a stronger magnetic flux can be generated.

  In addition, since each of the cores 81 to 83 has a simple block-like shape, the cores 81 to 83 can be configured by electromagnetic steel plates 810, 820, and 830 that are laminated. Thereby, compared with the case where each core 81-83 is made into a powder magnetic core, for example, the saturation magnetic flux density of each core 81-83, heat resistance, and intensity | strength increase. Higher output of the motor M can be realized by increasing the saturation magnetic flux density. Furthermore, as described above, by aligning the rolling direction (direction of easy magnetization) D with the rotation axis AX, the magnetic flux passing through each of the cores 81 to 83 becomes substantially parallel to the axial direction X, and the magnetic characteristics can be further enhanced.

  In addition, the flanges 81b to 83b of the cores 81 to 83, the coils 91 and 92, and the pressing members 5A, 5B, 6A, 6B, 7A, 7B are between the first support plate 3 and the second support plate 4 Therefore, these elements can be supported by the support plates 3 and 4 in any direction along the rotation axis AX.

Second Embodiment
In 1st Embodiment, each pressing member 5A, 5B, 6A, 6B, 7A, 7B was disclosed as an example of the fixing members 5-7. In the second embodiment, other examples of the fixing members 5 to 7 are disclosed. The structures that are not particularly mentioned are the same as in the first embodiment.

FIG. 14 is a perspective view schematically showing the cores 81 to 83 and the fixing members 5 to 7 in the present embodiment.
The plurality of first cores 81 are fixed by a first fixing member 5 formed of an insulating resin material. The first fixing member 5 has a shape in which a gap between the first pressing members 5A and 5B in the first embodiment is filled. Specifically, the first fixing member 5 has a plurality of first holding portions 55 located between the adjacent first cores 81. The first holding portion 55 covers both surfaces of both ridges 81 b of the adjacent first cores 81. The first holding part 55 is also in contact with the side surface of the core body 81a.

  The plurality of second cores 82 are fixed by the second fixing member 6 formed of an insulating resin material. The second fixing member 6 has a shape in which a gap between the second pressing members 6A and 6B in the first embodiment is filled. Specifically, the second fixing members 6 are respectively disposed between the adjacent second cores 82, and cover both surfaces of the flanges 82b of the adjacent second cores 82. The second fixing member 6 is also in contact with the side surface of the core body 82a.

  The plurality of third cores 83 are fixed by a third fixing member 7 formed of an insulating resin material. The third fixing member 7 has a shape in which a gap between the third pressing members 7A and 7B in the first embodiment is filled. Specifically, the third fixing member 7 has a plurality of second holding portions 75 positioned between adjacent third cores 83. The second holding portion 75 covers both surfaces of the flange portions 83 b of both the adjacent third cores 83. The second holding part 75 is also in contact with the side surface of the core body 83a.

  The first fixing member 5 can be integrally formed with the first core 81 by an insert mold in which the first core 81 is disposed in the mold and a resin is injected into the mold. Similarly, the second fixing member 6 and the third fixing member 7 can be integrally formed with the second core 82 and the third core 83 by insert molding, respectively.

  The first fixing member 5 and the first core 81, the second fixing member 6 and the second core 82, and the third fixing member 7 and the third core 83 are held between the support plates 3 and 4 as in the first embodiment. Is done. Each fixing member 5-7 and each support plate 3 and 4 may be connected with a volt | bolt and a nut.

With the structure of the present embodiment, the number of parts for fixing the cores 81 to 83 can be reduced as compared with the case where the cores 81 to 83 are held by the pair of pressing members as in the first embodiment. Thereby, the assembly process number of the stator 2 can be reduced.
In addition, the same effects as those of the first embodiment can be obtained from this embodiment.

  In the present embodiment, the motor M including the four rotors 1A to 1D and the three stators 2A to 2C is disclosed. However, the motor M may include a larger number of stators and rotors or a smaller number of stators and rotors.

  The flange portion 81 b of the first core 81 is not limited to one projecting in the circumferential direction C from the core body 81 a, and may project in another direction intersecting with the axial direction X. For example, the collar portion 81b may protrude in the radial direction R from the core body 81a. The same applies to the flange portion 82b of the second core 82 and the flange portion 83b of the third core 83.

  When the first support plate 3 is formed of a nonmagnetic and nonconductive material, the core openings 31 to 33 are not necessarily provided as long as the magnetic flux around the coils 91 and 92 is not inhibited. The same applies to the core openings 41 to 43 of the second support plate 4.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  M: motor, S: shaft, AX: rotary shaft, 1A to 1D: rotor, 2A to 2C: stator, 3: first support plate, 4: second support plate, 5A, 5B: first pressing member, 6A, 6B: second pressing member, 7A, 7B: third pressing member, 10A to 10D: housing, 20A to 20C: frame, 31 to 33, 41 to 43: core opening, 50, 70: holding portion, 81: 81 First core, 82: second core, 83: third core, 81b-83b: collar portion, 91: first coil, 92: second coil, 810 to 830: electromagnetic steel plate, X: axial direction, R: diameter Direction, C ... circumferential direction, D ... rolling direction.

Claims (10)

Stator of a rotating electric machine,
An annular first coil;
An annular second coil having a smaller radius than the first coil;
A plurality of first cores having a first core main body and a first ridge portion protruding from the first core main body, and arranged on the outer peripheral side of the first coil;
A plurality of second cores having a second core main body and a second flange projecting from the second core main body and disposed between the first coil and the second coil;
A plurality of third cores having a third core body and a third flange projecting from the third core body and disposed on the inner peripheral side of the second coil;
A first fixing member that fixes the plurality of first cores by holding the first flange portion of each of the plurality of first cores;
A second fixing member that fixes the plurality of second cores by holding the second flange of each of the plurality of second cores;
A third fixing member for fixing the plurality of third cores by holding the third brim portion of each of the plurality of third cores;
Stator. The first core is located between the first fixing member and the first coil,
The first fixing member includes a pair of first pressing members each having a plurality of first holding portions positioned between the adjacent first cores,
The first collar portion is held by the first holding portion of each of the pair of first pressing members.
The stator according to claim 1. The second fixing member includes a pair of second pressing members disposed between the adjacent second cores,
The second collar is sandwiched by the pair of second pressing members;
The stator according to claim 1. The third core is located between the second fixing member and the second coil,
The third fixing member includes a pair of third pressing members each having a plurality of second holding portions positioned between the adjacent third cores,
The third collar portion is held by the second holding portion of each of the pair of third pressing members.
The stator according to any one of claims 1 to 3. At least one of the first core, the second core, and the third core includes a plurality of laminated electromagnetic steel plates.
The stator according to any one of claims 1 to 4. Each of the plurality of electromagnetic steel plates is
A first portion corresponding to the first core body, the second core body, or the third core body;
And a second portion corresponding to the first ridge portion, the second ridge portion, or the third ridge portion,
The plurality of electromagnetic steel sheets are connected to each other in the second portion.
The stator according to claim 5. At least one of the first core, the second core, and the third core is a dust core,
The stator according to any one of claims 1 to 4. It further comprises a first support plate and a second support plate facing each other,
The first collar portion, the second collar portion, the third collar portion, the first coil, the second coil, the first fixing member, the second fixing member and the third fixing member are the first Disposed between the support plate and the second support plate,
The stator according to any one of claims 1 to 7. A shaft extending along the rotational axis,
A rotor mounted on the shaft;
The stator according to any one of claims 1 to 8, opposed to the rotor via a gap in an axial direction parallel to the rotation axis,
A rotating electrical machine. A rotating electrical machine according to claim 9;
Wheels provided on both sides of the shaft of the rotating electrical machine;
A vehicle comprising:

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