JP2017005940A - Rotor structure of axial gap type rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance cooling performance for magnets of a rotor in an axial gap type rotary electric machine.SOLUTION: In a rotor structure of an axial gap type rotary electric machine including a rotor having a rotary shaft and a rotor body to be rotated together with the rotary shaft and a stator arranged oppositely to the rotor body in an axial direction of the rotary shaft, the rotor body includes: a disc-like rotor core; a plurality of permanent magnets fixed on the stator side first surface of the rotor core in an arrayed state in a peripheral direction; a jacket member covering the whole second surface of the rotor core on the opposite side to the stator and forming a cooling liquid passing space between the jacket member itself and the second surface; and fixing means for fixing the jacket member on the rotor core: in which the rotary shaft includes a cooling liquid lead-in passage and a lead-out passage connected to the cooling liquid passing space in its inside.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a rotor structure of an axial gap type rotating electrical machine (motor, generator, or motor / generator).

  Conventionally, an axial gap type rotating electrical machine having a structure in which a stator and a rotor are arranged so as to face each other in the axial direction of the rotor via an air gap and the stator and the rotor are housed in a hollow cylindrical housing is known.

  In this axial gap type rotating electric machine (hereinafter referred to as “rotating electric machine”), the rotor is arranged on one side of a disk-shaped rotor core made of electromagnetic steel plate or the like so that a plurality of magnets are arranged at regular intervals around the rotor axis. It has a structure.

  The temperature of the rotor rises as the rotating electrical machine is driven. However, when the rotor temperature rises, the magnetic force of the magnet may decrease and the performance of the rotating electrical machine may deteriorate. Therefore, it is necessary to forcibly cool the magnet.

  6 to 8 of Patent Document 1 disclose a rotating electrical machine including a rotor having a structure in which a plurality of magnets made of superconducting coils and a refrigerant flow pipe through which a refrigerant passes are arranged on one side of a rotor core.

JP 2006-187051 A

  According to the rotating electrical machine described in Patent Document 1, it is possible to mainly cool a wavy region through which the refrigerant flow pipe in the rotor core passes, but cooling performance for a plurality of magnets only by cooling such a narrow region. Is not enough and there is room for improvement.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotor structure of an axial gap type rotating electrical machine that can enhance the cooling performance of a magnet included in the rotor.

  In order to solve the above-described problems, the present invention provides a rotor having a rotating shaft and a rotor body that rotates together with the rotating shaft, and a stator that is disposed in the axial direction of the rotating shaft so as to face the rotor body. A rotor structure of an axial gap type rotating electrical machine provided, wherein the rotor body includes a disk-shaped rotor core, and a plurality of permanent magnets fixed in a circumferentially aligned state on the first surface on the stator side of the rotor core. A jacket member that covers the entire second surface of the rotor core opposite to the stator and that forms a coolant flow space between the second surface and a fixing means for fixing the jacket member to the rotor core And the rotary shaft includes a coolant introduction passage and a discharge passage communicating with the coolant circulation space. Providing rotor structure Rugyappu type rotary electric machine.

  According to the present invention, the coolant circulation space is formed between one surface of the rotor core and the jacket member that covers the entire one surface, so that the coolant is allowed to flow into the coolant circulation space, thereby being fixed to the rotor core and the rotor core. The plurality of permanent magnets can be efficiently cooled, and the cooling performance for the magnets can be enhanced. Further, the jacket member can be fixed to the rotor core by the fixing means.

  In the present invention, the jacket member includes a substrate portion that faces the rotor core and forms the coolant circulation space with the rotor core, an inner peripheral wall provided in a central portion of the substrate portion, and the substrate portion It is preferable that the coolant circulation space is continuously formed in the circumferential direction between the inner peripheral wall and the outer peripheral wall.

  According to this configuration, since the contact area between the rotor core and the coolant is increased, the cooling capacity for the permanent magnet can be increased.

  In the present invention, the jacket member has a first partition wall and a second partition wall that partition the coolant circulation space into a plurality of sections in the circumferential direction, and the first partition wall is radially extending from the inner peripheral wall. Extending outward and having a gap with the outer peripheral wall, the second partition wall extending radially inward from the outer peripheral wall and having a gap with the inner peripheral wall, It is preferable that the first partition wall and the second partition wall are alternately arranged in the circumferential direction.

  According to this configuration, the coolant introduced into the coolant circulation space alternately passes through the gap between the first partition wall and the outer peripheral wall and the gap between the second partition wall and the inner peripheral wall. Thus, it can flow in the coolant circulation space uniformly on the radially inner side and the radially outer side, and as a result, the rotor core and the plurality of magnets can be evenly distributed on the radially inner side and the radially outer side. Can be cooled.

  In the present invention, the fixing means is a clamp member that sandwiches the permanent magnet, the rotor core, and the jacket member, and a pair of arm portions extending in the radial direction of the rotor core and a position radially outside the rotor core. It is preferable to have a connecting portion that connects the pair of arm portions.

  According to this configuration, since the permanent magnet and the jacket member can be pressed to the rotor core side by the pair of arm portions, the fixing strength of the permanent magnet and the jacket member can be increased.

  In this invention, it is preferable that the position of the arm part by the side of the said jacket member of the said clamp member corresponds with the position of the said 1st partition wall and the said 2nd partition wall in the said circumferential direction.

  According to this configuration, in order to fix the arm portion on the jacket member side to the jacket member, the arm portion can be embedded in the first partition wall and the second partition wall from the substrate portion side of the jacket member. Compared with the case where the position of the arm part on the jacket member side does not coincide with the position of the first partition wall and the second partition wall, the flow passage area of the coolant circulation space can be increased, and the cooling performance is improved. be able to. More specifically, in order to fix the arm part to the jacket member when the position of the arm part on the jacket member side does not coincide with the position of the first partition wall and the second partition wall, the arm part is the substrate part. For this purpose, it is necessary to raise the substrate portion toward the rotor core at the embedding position in order to sufficiently secure the thickness (cover depth) of the substrate portion at the embedding position. Although there is a concern that the flow passage area of the circulation space may be reduced, this configuration does not cause such inconvenience.

  In this invention, it is preferable that the arm part by the side of the said permanent magnet of the said clamp member presses down the said permanent magnet adjacent to the said circumferential direction in the position of these circumferential direction edge parts.

  According to this configuration, since the permanent magnets adjacent to each other can be pressed to the rotor core side by the common clamp member, the configuration is rational.

  In the present invention, a soft magnetic body is disposed in a gap between the permanent magnets adjacent to each other in the circumferential direction so as to close the gap, and the arm portion on the permanent magnet side of the clamp member includes the permanent magnet and the It is preferable to hold down the soft magnetic body at the boundary portion.

  According to this configuration, the permanent magnet and the soft magnetic body can be pressed to the rotor core side by the clamp member. Furthermore, even when the arm portion is made of a non-magnetic material, the arm portion does not cover the entire soft magnetic material, and the reluctance torque is improved by applying a magnetic field to the soft magnetic material. Can do.

  In this invention, it is preferable that the said permanent magnet is divided | segmented into plurality in the radial direction of the said rotor core.

  According to this configuration, by dividing the permanent magnet into a plurality of parts, it is possible to reduce eddy current loss, which is a main cause of heat generation of the permanent magnet, and to securely hold the permanent magnet at the arm portion. .

  In the present invention, the permanent magnet has a plurality of divided grooves extending in the radial direction of the rotor core and a plurality of divided grooves extending in the circumferential direction, and the groove bottom of each divided groove is the shaft of the permanent magnet. It is preferable to be located on the rotor core side with respect to the central portion in the direction.

  According to this configuration, since the groove bottom of the split groove is positioned on the rotor core side with respect to the central portion of the permanent magnet in the axial direction, the permanent magnet is prevented from falling apart and the permanent magnet is assembled to the rotor core. The eddy current loss can be reduced while improving the efficiency.

  In the present invention, the jacket member has an intake port for taking in the coolant from the introduction passage into the coolant circulation space and a discharge port for discharging the coolant from the coolant circulation space to the outlet passage. Preferably, two peripheral walls are provided, the two intake ports are arranged on the opposite sides in the radial direction, and the two discharge ports are arranged on the opposite sides in the radial direction.

  According to this configuration, the coolant is taken into the coolant circulation space from the two inlets, the coolant in the coolant circulation space is discharged from the two outlets, and the two inlets are in the radial direction. Are provided at positions opposite to each other, and the two discharge ports are provided at positions opposite to each other in the radial direction, so that the temperature difference of the coolant in the circumferential direction in the coolant flow passage is suppressed, and The cooling performance can be further enhanced.

  In the present invention, it is preferable that the introduction passage is disposed on the permanent magnet side and the lead-out passage is disposed on the jacket member side with the position of the rotor core in the axial direction as a boundary.

  According to this configuration, the introduction passage is disposed on the permanent magnet side, which is likely to be hotter than the jacket member, and the lead-out passage is disposed on the jacket member side, so that the heat of the permanent magnet is transferred to the inside of the introduction passage via the rotating shaft. Therefore, the cooling performance for the permanent magnet can be further enhanced.

  In the present invention, the axial gap type rotating electrical machine has a structure in which two rotors are arranged on both sides of one stator in the axial direction, and the introduction passage and the lead-out passage are the rotation It is preferable that the lead-in passage and the lead-out passage are arranged in parallel in a shaft and communicate with the coolant circulation space of each rotor.

  According to this configuration, in the axial gap type rotating electrical machine having a so-called double rotor structure, both rotors can be uniformly cooled.

  In the present invention, the coolant circulation spaces of the two rotors are connected in parallel via the introduction passage and the lead-out passage, or are connected to the introduction-side relay passage and the lead-out passage connected to the introduction passage. It is preferable that the one rotor and the other rotor are connected in parallel via the connected lead-out side relay passages, and that the flow passage areas of the connection portions with the introduction passage or the introduction-side relay passage are different from each other.

  According to this configuration, when the connection position of the introduction passage or the introduction-side relay passage is different between one rotor and the other rotor, the flow area of the connection portion is made different so that the one rotor and the other rotor The flow rate of the coolant flowing into the coolant flow space can be made equal by the rotor of the same. More specifically, for example, when one rotor is connected to the upstream side of the introduction passage from the other rotor, a pressure difference due to pressure loss occurs between the connection portions due to the difference in the connection position, and the flow rate is reduced. There is a possibility that a difference will occur, but by making the flow area of the connection part different, it becomes possible to compensate the pressure difference with the difference in the flow area and make the flow rate equal. The cooling capacity for the permanent magnet can be made the same in the downstream rotor.

  As described above, according to the present invention, it is possible to improve the cooling performance for the magnet of the rotor of the axial gap type rotating electrical machine.

It is a disassembled perspective view which shows the axial gap type rotary electric machine which concerns on 1st Embodiment of this invention. It is a top view (partial sectional view) of the rotor shown in FIG. FIG. 2 is a rear view (partial cross-sectional view) of the rotor shown in FIG. 1. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is the EE sectional view taken on the line in FIG. It is the FF sectional view taken on the line in FIG. It is the GG sectional view taken on the line in FIG. It is a top view which shows a permanent magnet. It is a side view which shows a clamp member. It is a top view which shows an outer cylinder member. It is a side view which shows an outer cylinder member. It is sectional drawing (HH line cross section in FIG. 14) which shows an outer cylinder member. It is a top view which shows an inner cylinder member. It is a side view which shows an inner cylinder member. It is sectional drawing which shows the axial gap type rotary electric machine which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the axial gap type rotary electric machine which concerns on 2nd Embodiment of this invention. It is a side view which shows a clamp member. It is the JJ sectional view taken on the line in FIG. 18 (state which removed the housing). It is a side view which shows the inner cylinder member in FIG. It is a top view which shows the 1st modification of a rotor. (A) is the KK sectional view taken on the line in FIG. 23, (b) is a perspective view which shows the clamp member in FIG. (A) is sectional drawing which shows the 2nd modification of a rotor, (b) is a L direction arrow directional view in (a). (A) is a figure which shows the permanent magnet in the 3rd modification of a rotor, (b) is a M direction arrow directional view in (a).

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is an exploded perspective view of a rotating electrical machine 1A according to the first embodiment of the present invention. A rotating electrical machine 1 </ b> A shown in FIG. 1 is positioned on one side (the side on which the permanent magnet 26 is provided) of the rotor body 22 having the rotating shaft 20 as the center and the rotor body 22 described later of the rotor 2. On the other hand, an axial gap type of a so-called 1-rotor 1-stator type comprising a stator 4 facing the axial direction of the rotary shaft 20 with a predetermined interval and a cylindrical housing 6 in which the rotor 2 and the stator 4 are accommodated. It is a rotating electrical machine. In the following description, the direction parallel to the rotation shaft 20 is referred to as “axial direction”, the direction orthogonal to the rotation shaft 20 is referred to as “radial direction”, and the rotation direction of the rotation shaft 20 (rotor 2) is referred to as “circumferential direction”. .

  As shown in FIG. 1, the stator 4 includes a back yoke 12 having a structure in which an electromagnetic steel plate is spirally wound around an axis parallel to the axial direction, and the back yoke 12 arranged in a circumferential direction. A plurality of stator cores (not shown) fixed on the top, a coil 11 attached (wound) to each stator core, and an end plate 14 fixed to the outside of the back yoke 12 are provided.

  The stator 4 is inserted from one side of the cylindrical housing 6 to the inside thereof, and is fixed to the housing 6 via an end plate 14.

  An end plate 14 is also provided at the other end of the housing 6, and the end plate 14 closes the opening at the other end.

  The rotor 2 has a disk-shaped rotor body 22, a rotating shaft 20 that passes through the center of the rotor body 22, and a rotor body 22 that is fixed to the rotating shaft 20 with the rotor body 22 sandwiched from both the upper and lower sides (axial direction). A clamp member 32.

  The rotor 2 is disposed in the housing 6 so as to face the stator 4, and the rotary shaft 20 is inserted into the bearings 16 held by the end plates 14, so that the rotor 2 is rotatably supported by the end plates 14. ing.

  As shown in FIG. 6, the rotary shaft 20 includes therein a coolant introduction passage 44 and a lead-out passage 45 communicating with a coolant circulation space 41 described later.

  With the position of the rotor core 25 in the axial direction as a boundary, the introduction passage 44 is disposed on the permanent magnet 26 side, and the lead-out passage 45 is disposed on the jacket member 40 side.

  As shown in FIG. 6, the introduction passage 44 includes one main passage 44 a extending in the axial direction in the rotary shaft 20 and two branch passages 44 b (see FIG. 8) branched from the main passage 44 a. I have. The two branch passages 44b are arranged on opposite sides in the radial direction.

  As shown in FIG. 6, the lead-out passage 45 includes one main passage 45a extending in the axial direction in the rotary shaft 20 and two branch passages 45b (see FIG. 8) branching from the main passage 45a. I have. The two branch passages 45b are arranged on opposite sides in the radial direction.

  As shown in FIGS. 2 to 4, the rotor main body 22 includes a rotor main member 24 and a clamp member 32 that sandwiches the rotor main member 24 from both sides in the axial direction. In the example shown in FIGS. 2 and 3, eight clamp members 32a to 32h are provided.

  The rotor main member 24 includes a rotor core 25 formed in a substantially disk shape by winding a strip-shaped electromagnetic steel sheet in a spiral shape, and a first surface that is a surface on the stator 4 side of the rotor core 25 (FIGS. 4 to 4). 7 covers the entire second surface (the lower surface in FIGS. 4 to 7), which is the surface opposite to the stator 4 in the rotor core 25, and is fixed to the second surface. A jacket member 40 (see FIG. 3) that forms a coolant circulation space 41 (see FIGS. 4 to 10) therebetween, an inner cylinder member 27 that is provided at the center of the rotor core 25 and is fitted around the rotary shaft 20, And an outer cylinder member 28 fitted on the rotor core 25. The inner cylinder member 27 and the outer cylinder member 28 are made of a nonmagnetic material (austenitic stainless steel, aluminum, etc.).

  As shown in FIG. 11, the permanent magnet 26 has a substantially fan shape in a plan view. -7), and fixed to the upper surface of the liquid leakage prevention sheet 42 by adhesives. In the example shown in FIG. 2, eight permanent magnets 26 are fixed on the upper surface of the liquid leakage prevention sheet 42. The liquid leakage prevention sheet 42 is a sheet for preventing the coolant flowing between the jacket member 40 and the rotor core 25 from leaking to the permanent magnet 26 through the rotor core 25.

  As shown in FIGS. 4 to 10, the jacket member 40 is provided in a central portion of the substrate portion 40 b and a substrate portion 40 b that faces the rotor core 25 and forms a coolant circulation space 41 between the jacket core 40 and the rotor core 25. The peripheral wall 40c and the outer peripheral wall 40d provided in the outer peripheral part of the board | substrate part 40b are provided. The coolant circulation space 41 is formed continuously in the circumferential direction between the inner peripheral wall 40c and the outer peripheral wall 40d.

  The inner peripheral wall 40c includes an inlet 401 (see FIG. 6) for taking in the coolant from the branch passage 44b of the introduction passage 44 to the coolant circulation space 41, and a branch passage 45b of the outlet passage 45 from the coolant circulation space 41. Two discharge ports 402 (see FIG. 6) for discharging the coolant are provided.

  The two intake ports 401 are disposed on the opposite sides in the radial direction, and the two discharge ports 402 are disposed on the opposite sides in the radial direction.

  Further, as shown in FIG. 8, the jacket member 40 includes a first partition wall 48a, a second partition wall 48b, and a third partition wall 48c that partition the coolant circulation space 41 into a plurality of sections in the circumferential direction. ing. In the following description, the first partition wall 48a, the second partition wall 48b, and the third partition wall 48c are collectively referred to as a partition wall 48.

  The first partition wall 48a extends radially outward from the inner peripheral wall 40c and has a gap 49 (see FIGS. 8 and 9) between the first partition wall 48a and the outer peripheral wall 40d. The second partition wall 48b extends radially inward from the outer peripheral wall 40d and has a gap 49 (see FIG. 8) between the second partition wall 48b and the inner peripheral wall 40c. The third partition wall 48c extends in the radial direction so as to connect the inner peripheral wall 40c and the outer peripheral wall 40d.

  The first partition walls 48a and the second partition walls 48b are alternately arranged in the circumferential direction. In the example shown in FIG. 8, the jacket member 40 has four first partition walls 48a, two second partition walls 48b, and two third partition walls 48c. The two third partition walls 48c are positioned on opposite sides with respect to the rotating shaft 20 in a state where they are positioned on the same straight line. Two first partition walls 48a and one second partition wall 48b are arranged at equal intervals on one side (upper side in FIG. 8) and the other side (lower side in FIG. 8) with the straight line as a boundary, The one second partition wall 48b is disposed between the two first partition walls 48a. The partition walls 48 adjacent to each other in the circumferential direction form an angle of 45 degrees around the rotation axis 20.

  In the third partition wall 48 c, the upper surface (the rotor core 25 side) is in contact with the second surface of the rotor core 25 over the entire radial direction. Thereby, the whole third partition wall 48c blocks the flow of the coolant.

  As shown in FIGS. 8 and 9, the first partition wall 48a has a radially outer tip located outside the intermediate position between the inner peripheral wall 40c and the outer peripheral wall 40d, and extends over the entire radial direction. The upper surface (the rotor core 25 side) is in contact with the second surface of the rotor core 25. As shown in FIG. 9, in the section between the tip of the first partition wall 48 a and the outer peripheral wall 40 d, the substrate portion 40 b is raised toward the rotor core 25, and the top of the raised portion and the rotor core 25 are A gap 49 is provided between them.

  As shown in FIG. 8, the second partition wall 48 b has a radially outer tip portion located on the inner side of the intermediate position between the inner peripheral wall 40 c and the outer peripheral wall 40 d. The surface on the rotor core 25 side is in contact with the second surface of the rotor core 25. In the section between the distal end portion of the second partition wall 48b and the inner peripheral wall 40c, the substrate portion 40b is raised toward the rotor core 25, and a gap 49 is provided between the top of the raised portion and the rotor core 25. ing.

  As shown in FIGS. 9 and 10, a groove 40a extending in the radial direction from the inner peripheral wall 40c to the outer peripheral wall 40d is formed on the lower surface of the jacket member 40 (the surface opposite to the rotor core 25). . The circumferential position of the groove 40a is set to the same position as the first partition wall 48a, the second partition wall 48b, and the third partition wall 48c. This groove part 40a is a part into which an arm part 33a described later is fitted.

  As shown in FIGS. 4 to 7, the outer cylinder member 28 is disposed on the outer side of the rotor core 25, etc. in a state of being fitted on the rotor core 25, the liquid leakage prevention sheet 42 fixed thereto, the permanent magnet 26, and the jacket member 40. Is arranged.

  As shown in FIGS. 4 to 7, the outer cylinder member 28 has an axis substantially equal to the dimension obtained by adding the thickness of the liquid leakage prevention sheet 42, the thickness of the permanent magnet 26, and the thickness of the jacket member 40 to the thickness of the rotor core 25. Has directional dimensions. At both upper and lower ends of the outer cylinder member 28, flanges 28b (see FIG. 6) projecting inward over the entire circumference are provided, and liquid leakage fixed to the upper surface of the rotor core 25 by these flanges 28b. The prevention sheet 42 and the permanent magnet 26 and the jacket member 40 fixed to the lower surface are pressed down to the rotor core 25 side.

  As shown in FIGS. 6, 10, and 11, a step portion 26 b extending in the circumferential direction is formed at the radially outer edge portion of each permanent magnet 26, and the flange portion 28 b is formed from the side opposite to the rotor core 25. By engaging with 26b, the upper end surface of the outer cylinder member 28 and the surface of each permanent magnet 26 are flush with each other, and the lower end surface of the outer cylinder member 28 and the surface of the jacket member 40 are flush with each other. The axial dimension of the inner cylinder member 27 is also equal to the axial dimension of the outer cylinder member 28. Accordingly, the upper surfaces of the inner cylinder member 27, the outer cylinder member 28, and the permanent magnets 26 positioned therebetween are mutually facing. Each lower surface is similarly flush.

  As shown in FIG. 15, the outer cylinder member 28 includes two parts 29 </ b> A and 29 </ b> B that are fitted in the axial direction. With this configuration, the liquid leak fixed to the upper surface of the rotor core 25. The prevention sheet 42 and the permanent magnet 26 and the jacket member 40 fixed to the lower surface can be pressed from both the upper and lower sides by the flange portion 28b.

  The clamp member 32 fixes the rotor core 25 and the permanent magnet 26 by sandwiching the rotor core 25, each permanent magnet 26 fixed to the upper surface thereof, and the jacket member 40 fixed to the lower surface thereof from above and below. The strength and the fixing strength between the rotor body 25 and the jacket member 40 are reinforced.

  As shown in FIGS. 2 to 4, the clamp member 32 has the rotor main member 24 so as to hold the rotor main member 24 from the outside in the radial direction at the position of the end of each permanent magnet 26 in the circumferential direction. It is attached to. In the example shown in FIGS. 2 and 3, eight clamp members 32 are attached to the rotor main member 24.

  As shown in FIGS. 4, 5, 7, and 12, each clamp member 32 includes a pair of arm portions 33 a and 33 a that extend in the radial direction of the rotor main member 24 at positions on the upper and lower sides of the rotor main member 24, and The arm portions 33a and 33a have a U-shape in a side view including a connecting portion 33b that connects the arm main portions 24a at positions radially outside the rotor main member 24.

  The material of the clamp member 32 is not particularly limited, but is preferably made of a material that can suppress the occurrence of eddy current loss in the clamp member 32. For example, aluminum, stainless steel, synthetic resin, etc. The non-magnetic material or soft magnetic material can be used. Moreover, the clamp member 32 can be comprised by laminating | stacking and shape | molding the thin plate comprised from these materials, for example.

  The position of the arm part 33a on the lower side (jacket member 40 side) of the clamp member 32 coincides with the positions of the first partition wall 48a, the second partition wall 48b, and the third partition wall 48c in the circumferential direction. The lower arm portion 33a presses the clamp member 40 toward the rotor core 25 while being fitted in the groove portion 40a of the clamp member 40. Since the thickness of the arm portion 33a in the vertical direction is set to be the same as the depth of the groove portion 40a, the lower surface of the arm portion 33a is flush with the lower surface of the clamp member 40.

  As shown in FIGS. 2 and 9 to 11, the clamp member 32 presses the end portions of a pair of permanent magnets 26 adjacent in the circumferential direction on the upper side of the rotor core 25 with an arm portion 33 a on the permanent magnet 26 side. The partition wall 48 of the jacket member 40 is attached to the rotor main member 24 below the rotor core 25 so as to be pressed by the arm portion 33a on the jacket member 40 side. With this configuration, each permanent magnet 26 on the upper side of the rotor core 25 is pressed to the rotor core 25 side by the two clamp members 32.

  As shown in FIGS. 9 to 11, step portions 26 a extending in the radial direction are formed at both ends in the circumferential direction of each permanent magnet 26, and the arm portion 33 a on the permanent magnet 26 side of the clamp member 32 is formed as follows. The stepped portion 26b is engaged from the side opposite to the rotor core 25 in a state of being interposed between the adjacent permanent magnets 26. With this configuration, the surface of the arm portion 33a and the surface of each permanent magnet 26 are flush with each other.

  As shown in FIGS. 13 and 14, grooves 28 a each having a shape corresponding to the clamp member 32 are formed at positions corresponding to between the adjacent permanent magnets 26 in the outer cylinder member 28. Similarly, grooves 27a having shapes corresponding to the arm portions 33a and 33a of the clamp members 32 are formed at the same position of the cylindrical member 27 (see FIGS. 16 and 17). The clamp member 32 is mounted on the rotor main member 24 in a state where the clamp member 32 is fitted in the grooves 27 a and 28 a, so that the surface of the clamp member 32 is the upper and lower surfaces of the inner cylinder member 27 and the upper and lower surfaces of the outer cylinder member 28. It is flush with each surface and the outer peripheral surface. That is, as shown in FIG. 1, the rotor body 22 is formed in a disk shape with almost no irregularities on its upper and lower surfaces and outer peripheral surface.

  In addition, the inner cylinder member 27 is formed with an introduction opening 27b at a position corresponding to the two branch passages 44b of the introduction passage 44, and at the position corresponding to the two branch passages 45b of the lead-out passage 45. 27c is formed. The introduction opening portion 27 b communicates with the intake port 401, and the lead-out opening portion 27 c communicates with the discharge port 402.

  The rotating shaft 20 is inserted inside the inner cylinder member 27 of the rotor body 22 configured as described above, and the rotor body 22 is fixed to the rotating shaft 20 in this state.

  Specifically, as shown in FIGS. 4 to 7, a flange portion 20 a and a male screw portion 20 b are provided at a predetermined interval corresponding to the rotor body 22 in the middle portion of the rotating shaft 20. It is prevented from coming off by this flange 20a via a ring member 35. The nut member 34 is screwed and attached to the male screw portion 20b, so that the rotor body 22 is sandwiched in the axial direction between the nut member 34 and the flange portion 20a (ring member 35). It is fixed to. In addition, although illustration is abbreviate | omitted, the inner cylinder member 27 and the rotating shaft 20 are stopped by key coupling.

  In a state where the rotor body 22 is fixed to the rotary shaft 20, as shown in FIGS. 4, 5, and 7, the ends of the arm portions 33 a and 33 a of the clamp members 32 are connected to the rotor core 25 side by the nut members 34 and the ring members 35. It is held in. A flange 33c that extends in the opposite direction along the rotary shaft 20 is formed at the tip of each arm 33a, 33a of the clamp member 32, and the flange of the upper (permanent magnet 26) arm 33a. 33 c is inserted into a recess 34 a formed in the center of the nut member 34, and a flange portion 33 c of the lower (jacket member 40 side) arm portion 33 a is inserted inside the ring member 35. Thereby, the collar part 33c of each arm part 33a is restrained from the radial direction outer side, and the displacement is controlled to the radial direction outer side of each clamp member 32.

  Next, the effect of the rotor 2 of this rotary electric machine 1 is demonstrated.

  The coolant fed from the coolant tank (not shown) by pump driving is introduced into the coolant circulation space 41 from the introduction passage 44 of the rotary shaft 20 through the introduction opening 27 b and the intake port 401. The coolant introduced into the coolant circulation space 41 passes through the gap 49 between the first partition wall 48a and the outer peripheral wall 40d and the gap 49 between the second partition wall 48b and the inner peripheral wall 40c. It flows in the coolant circulation space 41 while meandering, is discharged to the lead-out passage 45 of the rotary shaft 20 through the outlet 402 and the lead-out opening 27c, and is collected in the coolant tank. Thereby, the rotor core 25 and the permanent magnet 26 are cooled.

  According to the present embodiment, the coolant circulation space 41 is formed between the one surface (second surface) of the rotor core 25 and the jacket member 40 that covers the entire one surface, so that the coolant is supplied to the coolant circulation space 41. By flowing, the rotor core 25 and the plurality of permanent magnets 26 fixed to the rotor core 25 can be efficiently cooled, and the cooling performance for the permanent magnet 26 can be enhanced. Further, the jacket member 40 can be fixed to the rotor core 25 by the clamp member 32.

  Further, according to the present embodiment, the coolant circulation space 41 is continuously formed in the circumferential direction between the inner peripheral wall 40c and the outer peripheral wall 40d, so that the contact area between the rotor core 25 and the coolant is large. Thus, the cooling capacity for the permanent magnet 26 can be increased.

  Further, according to the present embodiment, the coolant introduced into the coolant circulation space 41 is formed between the gap 49 between the first partition wall 48a and the outer peripheral wall 40d, the second partition wall 48b, and the inner peripheral wall 40c. Since it flows meandering so as to alternately pass through the gaps 49, it can flow uniformly in the coolant circulation space 41 between the radially inner side and the radially outer side, and as a result, the rotor core 25 and the plurality of permanent The magnet 26 can be cooled uniformly on the radially inner side and the radially outer side.

  In addition, according to the present embodiment, the permanent magnet 26 and the jacket member 40 can be pressed to the rotor core 25 side by the pair of arm portions 33a, 33a, so that the fixing strength of the permanent magnet 26 and the jacket member 40 can be increased. .

  Further, according to the present embodiment, in order to fix the arm portion 33a on the jacket member 40 side to the jacket member 40, the arm portion 33a is connected to the first partition wall 48a and the second partition from the substrate portion 40b side of the jacket member 40. Since it can be embedded in the wall 48b and the third partition wall 48c, the position of the arm portion 33a on the jacket member 40 side is the same as the position of the first partition wall 48a, the second partition wall 48b, and the third partition wall 48c. Compared with the case where they do not match, the flow passage area of the coolant circulation space 41 can be increased, and the cooling performance can be improved.

  According to the present embodiment, the arm portion 33a on the permanent magnet 26 side of the clamp member 32 presses the permanent magnets 26 adjacent to each other in the circumferential direction at the positions of the circumferential end portions 26a. Can be pressed down to the rotor core 25 side by the common clamp member 32, so that the configuration is rational.

  Further, according to the present embodiment, the cooling liquid is taken into the cooling liquid circulation space 41 from the two intake ports 401, and the cooling liquid in the cooling liquid circulation space 41 is discharged from the two discharge ports 402. Since the two intake ports 401 are provided at positions opposite to each other in the radial direction and the two discharge ports 402 are provided at positions opposite to each other in the radial direction, the coolant in the circumferential direction in the coolant circulation space 41 is provided. Thus, the cooling performance for the permanent magnet 26 can be further enhanced.

  Further, according to the present embodiment, the introduction passage 44 is disposed on the permanent magnet 26 side, which is likely to be hotter than the jacket member 40, and the lead-out passage 45 is disposed on the jacket member 40 side, whereby the heat of the permanent magnet 26 is obtained. Can be radiated to the coolant in the introduction passage 44 via the rotary shaft 20, so that the cooling performance for the permanent magnet 26 can be further enhanced.

(Second Embodiment)
18 and 19 are sectional views showing an axial gap type rotating electrical machine according to the second embodiment of the present invention. FIG. 18 and FIG. 19 differ in cutting position with respect to the axial gap type rotating electrical machine. In addition, about the structure similar to 1st Embodiment, the code | symbol same as 1st Embodiment is attached | subjected and the description is abbreviate | omitted.

  An axial gap type rotating electrical machine (hereinafter referred to as “rotating electrical machine”) 1B according to the second embodiment includes a rotor 2A having two rotor bodies 22A and 22B, one stator 4A, a clutch device 70, and a housing 6A. Is a so-called two-rotor one-stator type rotating electrical machine.

  The clutch device 70 includes a clutch 70a that can change the connection state between the rotor rotating shaft 20A and the output shaft 20B from which the power of the rotating electrical machine 1B is output, and a clutch case 70b that houses the clutch 70a.

  The clutch case 70b includes a cylindrical peripheral wall portion 701 extending in the axial direction of the rotor rotation shaft 20A, and disk-shaped end wall portions 702 provided at both ends of the peripheral wall portion 701. The end wall portion 702 on one axial side is fixed to the rotor rotating shaft 20A, and the end wall portion 702 on the other axial side is rotatably supported by the output shaft 20B via a bearing 70d.

  The housing 6A includes a cylindrical peripheral wall portion 60d extending in the axial direction of the rotor rotation shaft 20A, and disk-shaped end wall portions 60c provided at both ends of the peripheral wall portion 60d. The end wall 60c on one end side in the axial direction is rotatably supported on the rotor rotating shaft 20A via the bearing 60a, and the end wall portion 60c on the other end side in the axial direction is rotatably supported on the output shaft 60B via the bearing 60b. Has been.

  The rotor 2A includes a rotor rotating shaft 20A and two rotor main bodies 22A and 22B that rotate together with the rotor rotating shaft 20A.

  A stator 4A is provided between the rotor body 22A and the rotor body 22B so as to face the rotor bodies 22A and 22B at a predetermined interval. The structure of the rotor main bodies 22A and 22B is substantially the same as that of the rotor main body 22 according to the first embodiment except for the structures of the inner cylinder member and the clamp member. Each of the rotor main bodies 22A and 22B is disposed such that the permanent magnet 26 faces the stator 4A.

  These two rotor bodies 22A and 22B, the stator 4A, and the clutch device 70 are accommodated in the housing 6A.

  The stator 4A is fixed to the inner peripheral surface of the peripheral wall portion 60d of the housing 6A.

  The rotor main body 22A is disposed on one axial end side of the peripheral wall portion 701 of the clutch case 70b, and the rotor main body 22B is disposed on the other axial end side of the peripheral wall portion 701.

  The inner cylinder member 27A of the rotor body 22A has a cylindrical shape as shown in FIG. 21, and a plurality of notches extending from the upper end toward the lower side (stator 4A side) as shown in FIG. 27a. The plurality of notches 27a are formed at equal intervals in the circumferential direction. The inner cylinder member 27 </ b> A has an introduction opening 270 at a position corresponding to the intake port 401, and a lead-out opening 271 at a position corresponding to the discharge port 402.

  The inner cylinder member 27B of the rotor body 22B has a cylindrical shape and has a plurality of notches 27a extending from the lower end toward the upper side (stator 4A side) as shown in FIG. The plurality of notches 27a are formed at equal intervals in the circumferential direction. The inner cylinder member 27 </ b> B has an introduction opening 270 at a position corresponding to the intake port 401, and has a lead-out opening 271 at a position corresponding to the discharge port 402.

  As shown in FIG. 20A, the clamp member 32A of the rotor body 22A is provided at a tip of a pair of arm portions 33a, a connecting portion 33b for connecting the pair of arm portions 33a, and an upper arm portion 33a. And a flange portion 33c. In the clamp member 32A, the distal end portion of the lower arm portion 33a abuts on the distal end portion of the cutout portion 27a in the inner cylinder member 27A, and the flange portion 33c of the upper arm portion 33a protrudes upward from the cutout portion 27a. In the state, it is supported by the notch 27a.

  As shown in FIG. 20B, the clamp member 32B of the rotor body 22B is provided at the tip of a pair of arm portions 33a, a connecting portion 33b for connecting the pair of arm portions 33a, and a lower arm portion 33a. And a flange portion 33c. In the clamp member 32B, the distal end portion of the upper arm portion 33a abuts on the distal end portion of the cutout portion 27a in the inner cylinder member 27B, and the flange portion 33c of the lower arm portion 33a protrudes downward from the cutout portion 27a. In this state, it is supported by the notch 27a.

  When the nut member 34A is screwed and attached to a male screw portion (not shown) formed on the outer peripheral surface of the clutch case 70b, the clamp member 32A is fixed to the inner cylinder member 27A, whereby the rotor body 22A is clamped. The clutch case 70b is fitted in a state of being sandwiched in the axial direction by 32A.

  Similarly, when the nut member 34A is screwed and attached to the male thread portion formed on the outer peripheral surface of the clutch case 70b, the clamp member 32B is fixed to the inner cylinder member 27B, whereby the rotor body 22B is fixed to the clamp member. The clutch case 70b is fitted in a state of being sandwiched in the axial direction by 32B.

  As shown in FIGS. 21 and 22, two introduction passages 44 </ b> A and two lead-out passages 45 </ b> A are provided in the rotor rotation shaft 20 </ b> A, and these are arranged in parallel in the rotor rotation shaft 20 </ b> A. Has been placed. Each introduction passage 44A communicates with the coolant circulation space 41 of each rotor body 22A, 22B via the introduction opening 270 and the intake port 401, and each lead-out passage 45A includes the lead-out opening 271 and the discharge port 402. Via the coolant circulation space 41 of each rotor body 22A, 22B.

  Specifically, as shown in FIG. 18, the introduction passages 44 </ b> A and the coolant circulation spaces 41 of the rotor main bodies 22 </ b> A and 22 </ b> B are provided in the upper end wall portion 702 and the peripheral wall portion 701 of the clutch case 70 b. An introduction-side relay passage 703 that allows communication is formed, and a lead-out-side relay passage 704 that connects each lead-out passage 45A and the coolant circulation space 41 of each rotor body 22A, 22B is formed.

  The coolant circulation spaces 41 of the two rotor bodies 22A and 22B are connected in parallel via the introduction-side relay passage 703 and the outlet-side relay passage 704, and the rotor body 22A is connected to the introduction-side relay passage 703. Arranged upstream of 22B. The rotor main body 22A and the rotor main body 22B are different from each other in the flow area of the connection portion with the introduction-side relay passage 703. Specifically, the flow passage area of the inlet 401 in the rotor main body 22B is set larger than the flow passage area of the intake 401 in the rotor main body 22A, and the flow passage area of the introduction opening 270 in the rotor main body 22B. However, it is set larger than the flow path area of the opening 270 for introduction in the rotor body 22A.

  According to the second embodiment, in the axial gap type rotating electrical machine 1B having a so-called double rotor structure, both rotors can be efficiently cooled. Further, the connection position of the introduction-side relay passage 703 is different between the one rotor main body 22A and the other rotor main body 22B, but by making the flow passage areas of the connection portions different from each other, The flow rate of the coolant flowing into the coolant flow space 41 can be equalized with the other rotor body 22B. More specifically, when one rotor main body 22A is connected to the upstream side of the introduction-side relay passage 403 relative to the other rotor main body 22B, a pressure difference due to pressure loss occurs between the connection portions due to a difference in connection position. This may cause a difference in flow rate, but by making the flow area of the connection portion different, it becomes possible to make the flow rate equal by making up for the pressure difference with the difference in flow area. The cooling capacity for the permanent magnet 26 can be made the same in the upstream rotor body 22A and the downstream rotor body 22B.

  In the second embodiment, the two-rotor one-stator type rotary electric machine having the structure including the clutch device 70 is used. However, the two-rotor one-stator type rotary electric machine having no structure including the clutch device 70 may be used.

  In each of the above embodiments, a gap is provided between the permanent magnets 26 adjacent in the circumferential direction. However, a soft magnetic body 54 may be disposed in this gap so as to close the gap (FIG. 23, FIG. 23). 24). The arm portion 501 on the permanent magnet 26 side of the clamp member 50 may have a structure for pressing the permanent magnet 26 and the soft magnetic body 54 at the position of the boundary portion. Specifically, as shown in FIGS. 24A and 24B, there are two arm portions 501 on the permanent magnet 26 side, the two arm portions 501 and the arm portion 502 on the jacket member 40 side, It is good also as a structure connected with the connection part 503. FIG.

  With the clamp member 50 having such a structure, the permanent magnet 26 and the soft magnetic body 54 can be pressed to the rotor core 25 side by the clamp member 50. Furthermore, even when the arm portion 501 is made of a nonmagnetic material, the arm portion 501 does not cover the entire soft magnetic material 54, and the reluctance torque due to the magnetic field acting on the soft magnetic material 54 is reduced. Improvements can be made.

  As shown in FIG. 25, the permanent magnet 26 </ b> A may be divided into a plurality of pieces in the radial direction of the rotor core 25. In the example shown in FIG. 25, the permanent magnet 26 </ b> A has a plurality of dividing lines 51 that extend in the circumferential direction and are arranged in the radial direction.

  In this way, by dividing the permanent magnet 26 into a plurality of parts, it is possible to reduce eddy current loss, which is a main factor of the heat generation of the permanent magnet 26, and each arm portion 501 of the clamp member 50 shown in FIG. The permanent magnet 26 can be reliably held.

  In addition to a completely divided structure, a structure in which the stator side is apparently divided while maintaining the integrity of the permanent magnet may be used. That is, as shown in FIG. 26, the permanent magnet 26B has a plurality of dividing grooves 52 extending in the radial direction of the rotor core 25 and a plurality of dividing grooves 51 extending in the circumferential direction. The groove bottom may be positioned closer to the rotor core 25 than the central portion in the axial direction (thickness direction) of the permanent magnet 26B.

  Since the groove bottoms of the split grooves 51 and 52 are located closer to the rotor core 25 than the central portion of the permanent magnet 26B in the axial direction, the permanent magnet 26B is prevented from falling apart and the permanent magnet 26B to the rotor core 25 is prevented from falling apart. Eddy current loss can be reduced while improving the efficiency of the assembly work.

  Each of the divided grooves 51 and 52 may be impregnated with a resin or an adhesive. In this case, the strength of the permanent magnet 26B can be ensured.

1A, 1B Axial Gap Type Rotating Electric Machine 2, 2A Rotor 4, 4A Stator 20, 20A Rotating Shaft 22, 22A, 22B Rotor Body 25 Rotor Core 26, 26A, 26B Permanent Magnet 32, 32A, 32B, 50 Clamp Member 33a, 501, 502 Arm portion 33b, 503 Connection portion 40 Jacket member 40b Substrate portion 40c Inner peripheral wall 40d Outer peripheral wall 41 Coolant flow space 44, 44A Inlet passage 45, 45A Outlet passage 48a First partition wall 48b Second partition wall 51, 52 Dividing groove 403 Introduction side relay passage

Claims (13)

A rotor structure of an axial gap type rotating electrical machine comprising: a rotor having a rotating shaft and a rotor body rotating together with the rotating shaft; and a stator disposed in the axial direction of the rotating shaft so as to face the rotor body,
The rotor body includes a disk-shaped rotor core, a plurality of permanent magnets fixed in a circumferential direction on a first surface of the rotor core on the stator side, and a second of the rotor core opposite to the stator. A jacket member that covers the entire surface and that forms a coolant circulation space between the second surface and a fixing means that fixes the jacket member to the rotor core;
The rotor structure of an axial gap type rotating electrical machine, wherein the rotary shaft includes therein a coolant introduction passage and a lead-out passage communicating with the coolant circulation space. The jacket member is provided on a substrate portion that faces the rotor core and forms the coolant circulation space between the rotor core, an inner peripheral wall provided in a central portion of the substrate portion, and an outer peripheral portion of the substrate portion. An outer peripheral wall,
The rotor structure of an axial gap type rotating electrical machine according to claim 1, wherein the coolant circulation space is continuously formed in the circumferential direction between the inner peripheral wall and the outer peripheral wall. The jacket member has a first partition wall and a second partition wall that partition the coolant circulation space into a plurality of sections in the circumferential direction,
The first partition wall extends radially outward from the inner peripheral wall, and has a gap with the outer peripheral wall,
The second partition wall extends radially inward from the outer peripheral wall, and has a gap with the inner peripheral wall;
The rotor structure of an axial gap type rotating electrical machine according to claim 2, wherein the first partition wall and the second partition wall are alternately arranged in a circumferential direction.   The fixing means is a clamp member that sandwiches the permanent magnet, the rotor core, and the jacket member, and a pair of arm portions extending in the radial direction of the rotor core, and the pair of arm portions at positions radially outside the rotor core The rotor structure of an axial gap type rotating electrical machine according to claim 3, further comprising: a connecting portion that connects each other.   The axial position according to claim 4, wherein the position of the arm portion on the jacket member side of the clamp member coincides with the position of the first partition wall and the second partition wall in the circumferential direction. Gap type rotating electrical machine rotor structure.   6. The axial gap according to claim 4, wherein the arm portion on the permanent magnet side of the clamp member presses the permanent magnets adjacent to each other in the circumferential direction at the positions of the circumferential end portions thereof. The rotor structure of the type rotating electrical machine. In the gap between the permanent magnets adjacent to each other in the circumferential direction, a soft magnetic material is disposed in a state of closing the gap,
6. The axial gap type rotating electric machine according to claim 4, wherein the arm portion on the permanent magnet side of the clamp member presses the permanent magnet and the soft magnetic body at a boundary portion thereof. Rotor structure.   The rotor structure of an axial gap type rotating electric machine according to claim 6 or 7, wherein the permanent magnet is divided into a plurality of parts in a radial direction of the rotor core.   The permanent magnet has a plurality of divided grooves extending in the radial direction of the rotor core and a plurality of divided grooves extending in the circumferential direction, and the groove bottom of each divided groove is more than the central portion in the axial direction of the permanent magnet. The rotor structure of an axial gap type rotating electrical machine according to claim 6 or 7, wherein the rotor structure is located on the rotor core side. The jacket member has two intake ports for taking in the coolant from the introduction passage into the coolant circulation space and two discharge ports for discharging the coolant from the coolant circulation space to the outlet passage. Prepared,
The two intake ports are arranged on opposite sides in the radial direction, and the two discharge ports are arranged on opposite sides in the radial direction. A rotor structure of an axial gap type rotating electrical machine according to claim 1.   11. The system according to claim 1, wherein the introduction passage is disposed on the permanent magnet side and the lead-out passage is disposed on the jacket member side with a position of the rotor core in the axial direction as a boundary. A rotor structure of an axial gap type rotating electrical machine according to claim 1. The axial gap type rotating electrical machine has a structure in which two rotors are arranged on both sides of one stator in the axial direction,
The introduction passage and the lead-out passage are arranged in parallel in the rotation shaft,
The rotor structure of an axial gap type rotating electrical machine according to any one of claims 1 to 11, wherein the introduction passage and the lead-out passage communicate with the coolant circulation space of each rotor. The coolant circulation space of the two rotors is connected in parallel via the introduction passage and the lead-out passage, or the lead-out side relay passage connected to the lead-in passage and the lead-out side connected to the lead-out passage Connected in parallel via a relay passage,
The rotor structure of an axial gap type rotating electrical machine according to claim 12, wherein the one rotor and the other rotor have different flow passage areas at the connection portion between the introduction passage or the introduction-side relay passage. .

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