JP2018064402A - Axial gap type rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cool a rotor in a structure having a complicated rotor structure.SOLUTION: An axial gap type rotary electric machine includes: a stator 9; an axial facing rotor 20 which is disposed facing the stator 9 in an axial direction of a rotary shaft 4; and a radial facing rotor 30 which is disposed facing the stator 9 in a radial direction. A coolant flow passage 36a is formed penetrating through the radial facing rotor 30 in an axial direction. The axial facing rotor 20 includes a jacket member 25 covering an end part at the opposite side of the stator arrangement side. A coolant flow space 25A is formed at the jacket member 25. The jacket member 25 is formed with: a discharge passage 51 which discharges a coolant introduced from an introduction passage 44 formed at the rotary shaft 4 to the coolant flow space 25A; and a recovery passage 52 which recovers the coolant in the coolant flow space 25A and supplies the coolant to the coolant flow passage 36a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an axial gap type rotating electrical machine that includes a stator and a rotor that rotates together with a rotating shaft and is disposed so as to face the stator in the axial direction of the rotating shaft, and more particularly to a rotor of an axial gap type rotating electrical machine. The present invention relates to a cooling structure for a provided permanent magnet.

  A rotary electric machine such as an electric motor includes an axial gap type rotary electric machine in which a stator and a rotor are opposed to each other in an axial direction of a rotary shaft provided in the rotor via an air gap, and a radial direction of the rotary shaft. A radial gap type rotating electrical machine arranged so as to face each other is known.

  In general, a rotating electrical machine increases the temperature of a rotor as it is driven, but the force of a magnet decreases due to this, and there is a risk that performance such as torque may be reduced.

  Therefore, for both types of axial gap type and radial gap type, the rotating electrical machine is provided with a cooling flow path for flowing the cooling liquid in the rotor, and the cooling liquid is supplied from the hollow rotating shaft so that the magnet provided in the rotor is provided. Structures for forced cooling are known. In the following description, cooling the rotor means cooling the magnet mainly in the rotor.

  Further, regarding the axial gap type rotating electrical machine, the applicant efficiently flows the rotor core and a plurality of permanent magnets fixed to the rotor core by flowing a cooling liquid through the space inside the jacket member that covers the entire surface of the disk-shaped rotor. The structure which can be cooled is proposed (refer patent document 1).

  As described above, research is being conducted to improve the cooling performance of the permanent magnet provided in the rotor regardless of the axial gap type or the radial gap type.

  On the other hand, for the purpose of increasing torque in an axial gap type rotating electrical machine recently, for example, in addition to an axial gap type rotor, a radial gap type rotor is provided as a composite type, The rotor structure tends to be complicated, such as one having two rotors for one stator (two-rotor one-stator type) by arranging axial gap type rotors on both sides in the axial direction of the rotating shaft. For this reason, it is necessary to create a cooling flow path adapted to such a complicated rotor structure.

  For example, in an axial gap type rotating electrical machine having a plurality of rotors, in order to supply coolant to each rotor from a flow path provided on the rotary shaft, a long flow path connected to each rotor is connected to each rotor. If there are a plurality of each, the processing cost for providing the flow passage on the rotation shaft may increase, and the flow passage of the rotation shaft that does not directly contribute to cooling of the permanent magnet of the rotor becomes longer. There was a possibility that it could not be cooled.

Japanese Patent Application No. 2015-120159

  Accordingly, an object of the present invention is to provide an axial gap type rotating electrical machine that can efficiently cool a rotor even in a structure having a complicated rotor structure.

The present invention relates to an axial gap type rotating electrical machine including a stator and an axially opposed rotor that rotates together with a rotating shaft and is disposed to face the stator in the axial direction of the rotating shaft. A radial opposed rotor that is disposed radially opposite to the stator and rotates integrally with the axially opposed rotor is disposed at an arrangement location, and the coolant flow passage is axially provided in the radially opposed rotor. A passage for introducing a coolant is formed in the rotation shaft and extends in the axial direction from the opposite side of the stator arrangement side to the position corresponding to the axially opposed rotor with respect to the axially opposed rotor. The direction-facing rotor includes a jacket member that covers an end opposite to the stator arrangement side, and a permanent member in which a plurality of permanent magnets are arranged in a circumferential direction on the stator arrangement side end surface of the jacket member. Coolant flow space extending in correspondence with the stone placement area is formed,
The cooling passage is communicated with the jacket member through the introduction passage and the coolant circulation space, and the discharge passage through which the coolant is discharged to the coolant circulation space, and the coolant circulation space and the coolant flow passage. A recovery path for recovering the coolant in the liquid circulation space is formed.

  According to the above configuration, each of these rotors can be efficiently cooled not only in the one axially opposed rotor but also in an axial gap type rotating electrical machine provided with a radially opposed rotor.

  As an aspect of the present invention, the radially opposed rotor includes a plurality of permanent magnets arranged side by side in the circumferential direction, and the cooling fluid flow passage is at least one set of permanent magnets adjacent in the circumferential direction of the radially opposed rotor. It is provided between the magnets.

  According to the above configuration, since the coolant flow passage is provided between at least one pair of permanent magnets adjacent in the circumferential direction of the radially opposed rotor, the permanent magnet provided in the radially opposed rotor is cooled more efficiently. be able to.

  In addition, you may utilize the flux barrier hole (space | gap) penetrated and formed in the axial direction as a countermeasure against a leakage flux at the edge part of the width direction of a flat permanent magnet as a cooling fluid flow path. Thereby, the width direction edge part of the flat permanent magnet which is easy to be heated can be effectively cooled, without requiring the hole process for forming a cooling fluid flow path in the said radial direction opposing rotor.

  Further, as an aspect of the present invention, the jacket member includes an inner peripheral wall that is externally fitted to the rotating shaft, and an outer peripheral wall that is externally fitted to a core provided in the axially opposed rotor, and the radially opposed rotor is provided with the outer circumferential wall. Is provided with an inner rotor arranged to face the stator on the radially inner side at a position corresponding to the inner peripheral portion provided in the axially opposed rotor in the radial direction, and the coolant circulation space is formed with the inner peripheral wall. The discharge path and the recovery path are formed at different positions in the circumferential direction of the inner peripheral wall, and the jacket member communicates with the discharge path. A partition wall is provided for partitioning the coolant circulation space in the circumferential direction so as to form a coolant diffusion space and a coolant concentration space communicating with the recovery path, and partitions the diffusion space and the aggregation space. The partition wall is Extending from the inner circumferential wall radially outward is and that a gap between the outer peripheral wall.

  According to the above configuration, in the diffusion space, the cooling liquid diffuses firmly from the inner diameter to the outer diameter due to the centrifugal force accompanying the rotation of the rotor, and in the aggregated space, the cooling liquid diffused from the inner diameter to the outer diameter flows. Because the coolant that diffuses to the outside of the diameter is recovered in the recovery path without hindering the flow to the inside of the diameter, circulation (diffusion and aggregation) of the coolant is promoted as the entire coolant circulation space, The cooling liquid after circulating through the cooling liquid circulation space can be reliably recovered by the recovery path while efficiently cooling the permanent magnet provided in the axially opposed rotor.

  Furthermore, since the coolant recovered by the recovery passage further flows through the coolant flow passage of the inner rotor facing the inner peripheral wall in the axial direction, the permanent magnet provided in the inner rotor can be efficiently cooled. it can.

  Further, as an aspect of the present invention, the radially opposed rotor includes an outer rotor that is disposed radially opposite to the stator at a position corresponding to an outer peripheral portion of the radially opposed rotor. The outer side recovery path formed on the outer rotor side and communicated with one end side of the coolant flow passage is connected to the outer peripheral wall so that the other end side communicates with at least the diffusion space in the coolant circulation space. It is provided.

  According to the above configuration, since the other end side of the recovery path is provided on the outer peripheral wall so as to communicate with the diffusion space in the coolant circulation space, the recovery path is discharged from the discharge path in the diffusion space, and the radially opposed rotor The cooling liquid that diffuses to the outside of the diameter by using the centrifugal force accompanying the rotation of can be efficiently recovered by the outer recovery path.

  That is, the coolant recovered by the outer recovery path can be actively flowed to the coolant flow passage of the outer rotor facing the outer peripheral wall, and the permanent magnet of the outer rotor can be efficiently cooled. .

  As an aspect of the present invention, the axially opposed rotor is set as a first axially opposed rotor, and the first shaft on the opposite side to the first axially opposed rotor with respect to one stator in the axial direction. A second axially opposed rotor having the same structure as the directionally opposed rotor is disposed, and the rotating shaft corresponds to the second axially opposed rotor from the side opposite to the stator arrangement side with respect to the second axially opposed rotor. A cooling liquid lead-out path extending in the axial direction is formed up to a position where the cooling liquid flow path communicates with the cooling liquid circulation space through the discharge path in the second axially opposed rotor, and The coolant circulation space and the lead-out path communicate with each other through a recovery path.

  According to the above configuration, in the axial gap type rotating electrical machine including the two axially opposed rotors (the first axially opposed rotor and the second axially opposed rotor) and the radially opposed rotor (inner side rotor). These rotors can be efficiently cooled.

  According to the above configuration, the rotor can be efficiently cooled even in a structure having a complicated rotor structure.

The external view of the axial gap type rotary electric machine which concerns on 1st Embodiment. Explanatory drawing of the distribution path of the cooling fluid provided in the 1st rotor. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 4 is a sectional view taken along line B-O-C in FIG. 3. The external view of the axial gap type rotary electric machine which concerns on 2nd Embodiment. Explanatory drawing of the distribution path of the cooling fluid provided in the 1st rotor. The DD sectional view taken on the line of FIG. FIG. 8 is a cross-sectional view taken along line FO-G in FIG. 7. EE sectional view taken on the line of FIG.

  An embodiment of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is an external view of an axial gap type rotating electrical machine according to the first embodiment, FIG. 2 is an explanatory view schematically showing a flow path through which a coolant flows provided in the first rotor of the first embodiment, and FIG. FIG. 4 is a cross-sectional view taken along line AA in FIG. 2, illustrating the configuration and operation of the jacket member shown by a cross-section orthogonal to the axial direction of the jacket member, and FIG. 4 is a cross-sectional view taken along line B-O-C in FIG. It is a structure and action explanatory drawing of a 1st rotor.
The axial gap type rotating electrical machine 1 (hereinafter referred to as “rotating electrical machine 1”) according to the first embodiment is a so-called 2-rotor 1 stator type rotating electrical machine 1 including two rotors 2 and one stator 9. is there.

  The two rotors 2 (the first rotor 2A and the second rotor 2B) are provided with a rotating shaft 4 that is inserted through these central positions. The rotating shaft 4 is engaged with the rotor 2 and the shaft of the rotating shaft 4 is engaged. It arrange | positions so that the stator 9 may be inserted | pinched in a direction. As a result, the rotor 2 rotates around the axis of the rotary shaft 4 as a unit with the rotary shaft 4. In the figure, the X direction indicates the axial direction of the rotating shaft 4 of the rotor 2.

  As shown in FIG. 1, the rotor 2 is covered with a housing 21 formed of aluminum alloy or the like. The stator 9 also includes a cylindrical housing that covers a plurality of later-described core coil sets 91 arranged in the circumferential direction, but is not shown in FIG.

A housing 21 provided in the rotor 2 is integrally formed with a cylindrical peripheral wall 21a concentric with the rotary shaft 4 and a disk-shaped end wall 21b covering an opening on one end side in the axial direction of the peripheral wall 21a. It is formed in a bottomed cylindrical shape as a whole. An insertion hole 21c through which the rotation shaft 4 is inserted is formed at the center of the end wall 21b.
The stator 9 includes a plurality of core coil sets 91 arranged in a state of being arranged in the circumferential direction. As shown in FIG. 4, the core coil set 91 includes a barrel portion 91a having an axial center, and arm portions 91b (in FIG. 4, the axial direction in FIG. 4) that extends linearly to both sides of the barrel portion 91a. The body 91a has a coil 92 wound around the body 91a, and the arm 91b has a stator core 93 formed by laminating a plurality of steel plates. Yes. In this example, the stator core 93 is formed of a laminated body in which steel plates made of an amorphous soft magnetic material are laminated.

  On each of the axial end surface 93a of the tip portion of the stator core 93, the outer surface 93b positioned on the outer diameter side of the rotating shaft 4, and the inner surface 93c positioned on the inner diameter side of the rotating shaft 4, a laminated interface between the steel plates appears. As shown, the steel plates are laminated.

  Further, as shown in FIG. 4, the rotor 2 (the first rotor 2A and the second rotor 2B) is formed such that a groove portion 22 that is recessed in the axial direction from the stator side end surface 20a circulates around the axial direction. These rotors 2 are rotatable in unison with the rotating shaft 4 in a state where the opening sides of the respective groove portions 22 are opposed to each other at an interval as shown in FIG. 1 in the axial direction.

Since the first rotor 2A and the second rotor 2B have the same configuration, the following description is based on the configuration of the first rotor 2A.
The first rotor 2 </ b> A (hereinafter simply referred to as “rotor 2 </ b> A”) is a disk-shaped axially opposed rotor 20 (axial gap type rotor) disposed to face the stator core 93 with a gap in the axial direction of the rotating shaft 4. 20) and a cylindrical radially opposed rotor 30 (radial gap type rotor 30) that is disposed to face the stator core 93 with a gap in the radial direction at an axial stator disposition location.

  Further, as shown in FIG. 4, the radially opposed rotor 30 is fitted on the rotary shaft 4 and is disposed with an inner rotor 30 a disposed with a gap radially inward with respect to the arm portion 91 b of the stator 9. The outer rotor 30b is fitted in the housing 21 and disposed with a gap radially outward from the arm portion 91b of the stator 9.

  The radially opposed rotor 30 (the inner side rotor 30a and the outer side rotor 30b) and the axially opposed rotor 20 are integrally accommodated in the housing 21 in a state of being opposed to each other in the axial direction. Specifically, the inner rotor 30a is integrally disposed in a state where there is no gap with a facing surface (upper surface in FIG. 4) facing an inner peripheral wall 27 described later provided in the axially facing rotor 20 and on the outer side. The rotor 30b is integrally disposed so as to be opposed to a surface (an upper surface in FIG. 4) facing an outer peripheral wall 28 described later provided in the axially opposed rotor 20 with no gap.

  Thus, the rotor 2A constitutes the groove portion 22 described above by the stator arrangement side surface 20a of the axially opposed rotor 20, the outer peripheral surface of the inner rotor 30a, and the inner peripheral surface of the outer rotor 30b. The groove portion 22 is formed in an annular shape in plan view that extends over the entire circumference between the outer peripheral surface of the inner peripheral wall 27 and the inner peripheral surface of the outer peripheral wall 28.

  The stator core 93 provided in the stator 9 and the rotors 20, 30 a, 30 b provided in the rotor 2 </ b> A are arranged so that the tip of the stator core 93 is inserted into the groove 22 of the rotor 2 </ b> A. The axial end surface 93a, the outer surface 93b, and the inner surface 93c are opposed to the upper surface of the axially opposed rotor 20, the inner peripheral surface of the outer rotor 30b, and the outer peripheral surface of the inner rotor 30a with a gap therebetween. (Refer to FIG. 4).

  Thereby, a magnetic field can be generated in each gap between the rotor 2A and the stator core 93, and the magnetic field generated by the permanent magnets 24, 34a, and 34b described later provided in the rotors 20, 30a, and 30b is the stator. Further interacts with the magnetic field generated by the armature current of 9 to generate torque.

The radially opposed rotor 30 includes cylindrical rotor cores 33a and 33b (see FIG. 4) and a plurality of permanent magnets 34a and 34b (see FIG. 3).
The rotor cores 33a and 33b are formed by laminating a large number of annular electromagnetic steel plates having the same shape, and a plurality of magnet insertion holes 35a and 35b (see FIG. 3) are formed at predetermined intervals in the circumferential direction. As shown in FIG. 3, the permanent magnets 34a and 34b are arranged in the rotor cores 33a and 33b so as to have different polarities at predetermined intervals in the circumferential direction while being fitted into the magnet insertion holes 35a and 35b. .

  Specifically, the permanent magnets 34a and 34b are arranged in the state where the permanent magnets 34a and 34b are inserted into the magnet insertion holes 35a and 35b. It arrange | positions in the circumferential direction inside rotor core 33a, 33b so that it may become a south pole.

  As shown in FIG. 3, the rotor cores 33 a and 33 b are arranged between the adjacent permanent magnets 34 a and 34 b in the circumferential direction, more specifically, at the circumferential end portions of the magnet insertion holes 35 a and 35 b. Flux barriers (36a, 36b) (barrier through-holes) penetrating in the axial direction and constituting magnetic gaps so as to be adjacent to the outer ends in the circumferential direction of the permanent magnets 34a, 34b inserted into the magnets 35b, 35b. It is formed (see FIGS. 3 and 4).

  On the other hand, as shown in FIGS. 2 and 4, between the permanent magnets 34a and 34b adjacent to each other in the circumferential direction of the rotor cores 33a and 33b, coolant flow paths 36a and 36b for the coolant (water) are linear in the axial direction. It is formed to penetrate.

That is, in this example, the flux barriers (36a, 36b) formed in the axial direction between the magnet insertion holes 35a, 35b (permanent magnets 34a, 34b) adjacent in the circumferential direction of the rotor cores 33a, 33b are used as the coolant. The flow paths 36a and 36b are set.
However, the embodiment is not limited to the embodiment in which the flux barriers (36a, 36b) are applied as the coolant flow passages 36a, 36b as in this example, but the magnet insertion holes 35a, 35b (permanent magnets) adjacent in the circumferential direction of the rotor cores 33a, 33b. An embodiment in which the coolant flow passages 36a and 36b are formed separately from the flux barriers (36a and 36b) between 34a and 34b) may be employed.

  As shown in FIG. 4, the axially opposed rotor 20 includes a rotor core 23 formed in a substantially disk shape by winding a strip-shaped electromagnetic steel sheet in a spiral shape, and a stator arrangement side surface 20a of the rotor core 23 (see FIG. 4). 4 includes a plurality of permanent magnets 24 fixed to the upper surface) and a jacket member 25 (see FIGS. 3 and 4) covering the entire surface of the rotor core 23 opposite to the stator 9 (the lower surface in FIG. 4). Yes.

  The permanent magnets 24 have a substantially fan shape in plan view, and are arranged on the upper surface of the rotor core 23 via liquid leakage prevention sheets 41 (see FIG. 4) so as to be arranged in the circumferential direction so that the polarities are alternately changed. It is fixed to the upper surface of the liquid leakage prevention sheet 41 by the agent. The liquid leakage prevention sheet 41 is a sheet for preventing the coolant flowing through the jacket member 25 from leaking to the permanent magnet 24 through the rotor core 23.

  The permanent magnets 24 (see FIG. 4) provided in the axially opposed rotor 20 and the permanent magnets 34a and 34b (see FIG. 3) provided in the radially opposed rotor 30 are both the same number and the same pitch in the circumferential direction. It arrange | positions so that the arrangement | positioning location in the circumferential direction may correspond, and also arrange | positions so that a polarity may become the same in the circumferential direction.

  As shown in FIG. 4, the jacket member 25 is entirely formed of a nonmagnetic material (austenitic stainless steel, aluminum, etc.), and is a substrate portion positioned on the axially facing surface (bottom surface in FIG. 4) with the rotor core 23. 26, an inner peripheral wall 27 provided on the inner peripheral side of the substrate portion 26 and externally fitted to the rotating shaft 4, and an outer peripheral wall 28 provided on the outer peripheral side of the substrate portion 26 and externally fitted to the rotor core 23. Yes.

  As shown in FIGS. 3 and 4, the jacket member 25 has a substantially circular permanent magnet arrangement region 24z (FIG. 4) in which a plurality of fan-shaped permanent magnets 24 are arranged in the circumferential direction on the stator arrangement side surface 20a. A coolant circulation space 25 </ b> A that expands corresponding to the reference) is formed. In this example, the coolant circulation space 25A is continuously formed in the circumferential direction between the inner peripheral wall 27 and the outer peripheral wall 28, and the jacket member 25 (the substrate portion 26, the inner peripheral wall 27 and the outer peripheral wall 28) and the rotor core. 23 is surrounded by a surface opposite to the stator 9 (lower surface in FIG. 4).

  As shown in FIGS. 2 and 3, the jacket member 25 has partition walls 29 (29a, 29b) that partition the coolant circulation space 25A into a plurality of sections in the circumferential direction.

  As shown in FIG. 3, the partition wall 29 is formed at a portion corresponding to the permanent magnets 24, 24 adjacent in the circumferential direction of the coolant circulation space 25 </ b> A, and the coolant circulation space 25 </ b> A is partitioned by the partition wall 29. The formed partition space 42 coincides with the arrangement position of the permanent magnet 24 provided in each rotor 2A in the circumferential direction.

  The jacket member 25 includes eight partition walls 29, and the partition walls 29 adjacent to each other in the circumferential direction form an angle of 45 degrees around the rotation axis 4 as shown in FIG. As a result, the coolant circulation space 25 </ b> A is partitioned into eight partition spaces 42.

The partition wall 29 has two types, a radially inner partition wall 29a and a radially outer partition wall 29b.
The radially inner partition wall 29 a extends radially outward from the inner peripheral wall 27, and has a gap Sa between the outer peripheral wall 28. The radially outer partition wall 29 b extends radially inward from the outer peripheral wall 28, and has a gap Sb between the inner peripheral wall 27 and the inner peripheral wall 27.

  As described above, the radially inner partition wall 29a is provided on both sides of the one side position with respect to the rotation shaft 4 and the other side position on the same straight line in a plan view, and the pair of radially inner partition walls 29a includes the pair of radially inner partition walls 29a. Two sets of straight lines connecting the pair of radially inner partition walls 29a are provided so as to be orthogonal to each other, and a total of four radially inner partition walls 29a are configured in an X shape in plan view (see FIG. 3).

  As with the radially inner partition wall 29a, the radially outer partition wall 29b also includes two pairs of radially outer partition walls 29b, which are arranged so as to be orthogonal to each other. By arranging it at a position shifted by 45 degrees with respect to the partition wall 29a, it is configured in a cross shape in plan view (see the figure).

  It should be noted that at least one outer diameter partition wall 29b among the plurality of outer diameter partition walls 29b forms a gap Sb between the inner peripheral wall 27 so as to block the flow of the coolant to the adjacent partition space 42 as a whole. Instead, the inner wall 27 and the outer wall 28 may be connected to extend in the radial direction.

  As shown in FIG. 3, the partition space 42 in which the coolant circulation space 25 </ b> A is partitioned by the partition wall 29 includes a diffusion space 42 a that diffuses the coolant radially outward and an aggregated space that collects the coolant radially inward. 42b.

  Among the plurality of partition spaces 42, the partition space 42 adjacent on one side in the circumferential direction with respect to the radially inner partition wall 29 a is set as the diffusion space 42 a, and the partition space 42 adjacent on the other side in the circumferential direction is aggregated space 42b is set. Thereby, the diffusion space 42a and the aggregation space 42b are in a state where they are communicated in the circumferential direction by the gap Sa between the radially inner partition wall 29a and the outer peripheral wall 28.

  Further, as described above, the partition space 42 is arbitrarily set as the diffusion space 42a or the aggregation space 42b as long as the one side in the circumferential direction with respect to the radially inner partition wall 29a is the diffusion space 42a and the other side is the aggregation space 42b. In this example, the partition spaces 42 adjacent to each other on both sides in the circumferential direction with respect to the radially outer partition wall 29b are set to be both the diffusion space 42a or the aggregate space 42b.

  Specifically, as shown in FIG. 3, the four inner diameter partition walls 29a are arranged in order in the circumferential direction, the first inner diameter partition wall 29a1, the second inner diameter partition wall 29a2, the third inner diameter partition wall 29a3, and the fourth diameter. Among the four radially outer partition walls 29b, the radially outer partition wall 29b that is adjacent to each of the radially inner partition walls 29a in the plan view in the clockwise direction is sequentially arranged as the first radially outer partition wall 29a. 29b1, the second outer diameter partition wall 29b2, the third outer diameter partition wall 29b3, and the fourth outer diameter partition wall 29b4 will be described.

  In the present embodiment, the first and third diameter inner partition walls 29a1 and 29a3 are both set in the aggregated space 42b in the counterclockwise direction in a plan view, and the first and third diameter inner partition walls 29a1 and 29a1 are set. The diffusion space 42a is set in the clockwise direction in a plan view with respect to 29a3. Further, both the counterclockwise direction side in a plan view with respect to the second and fourth inner diameter partition walls 29a2 and 29a4 are set as the diffusion space 42a, and the second and fourth inner diameter partition walls 29a2 and 29a4 The clockwise direction side is set to the aggregated space 42b in plan view.

  Accordingly, the partition walls 42 adjacent to each other on both sides in the circumferential direction with respect to the first and third diameter outer partition walls 29b1 and 29b3 are both set as the diffusion spaces 42a, and the second and fourth diameter outer partition walls. The partition spaces 42 adjacent to both sides in the circumferential direction with respect to 29b2 and 29b4 are set to be the aggregated space 42b.

  Further, as shown in FIG. 4, the rotating shaft 4 includes a coolant that extends in the axial direction from the opposite side of the stator to the axially opposed rotor 20 to a position corresponding to the axially opposed rotor 20. The introduction path 44 is formed.

  As shown in FIG. 4, the introduction path 44 has one main passage 44a that extends in the axial direction from the position corresponding to the axially opposed rotor 20 to the lower front side in the rotation shaft 4, and the main passage 44a. 4 branch passages 44b (see FIG. 2 and FIG. 4) branch off from the upper end. The four branch passages 44b extend in the axial direction to a position corresponding to the axially opposed rotor 20, and extend radially outward toward intermediate positions in the circumferential direction of the four diffusion spaces 42a.

  As shown in FIGS. 2 and 4, the jacket member 25 discharges the coolant supplied to the axially opposed rotor 20 from the introduction path 44 formed in the rotating shaft 4 into the coolant circulation space 25 </ b> A. A path 51 and a recovery path 52 (52a, 52b) for recovering the coolant in the coolant circulation space 25A are formed.

  The discharge path 51 is formed inside the inner peripheral wall 27 of the jacket member 25 so as to correspond to each diffusion space 42a, and the periphery of the diffusion space 42a so as to communicate the branch passage 44b of the introduction path 44 and the coolant circulation space 25A. It is formed by extending in the radial direction at an intermediate position in the direction.

  That is, in the discharge path 51, the inner diameter end communicates with the outer diameter end of the branch passage 44 b of the introduction path 44, and the outer diameter end of the discharge path 51 and the coolant circulation space 25 </ b> A are on the outer periphery of the inner peripheral wall 27. It forms so that it may communicate via the discharge port 510 formed in the surface.

  The recovery path 52 is formed by an outer side recovery path 52 b formed inside the outer peripheral wall 28 of the jacket member 25 and an inner side recovery path 52 a formed inside the inner peripheral wall 27 of the jacket member 25.

  The outer side recovery path 52b is formed on the outer peripheral wall 28 of the jacket member 25 so as to communicate the coolant circulation space 25A and the coolant flow passage 36b (flux barrier) formed through the outer side rotor 30b in the axial direction. At the same time, the inner-side recovery passageway 52a communicates the coolant circulation space 25A with the coolant flow passage 36a (flux barrier) formed through the inner circumferential wall 27 of the jacket member 25 in the axial direction of the inner-side rotor 30a. It is formed as follows.

More specifically, as shown in FIG. 4, these recovery paths 52 are paths in which a radially extending portion 521 that extends radially in the radial direction and an axially extending portion 522 that extends in the axial direction extend through a bent portion 523. It is formed with.
In each of the outer side and the inner side, the recovery path 52 is configured such that the upper end of the axial extension portion 522 communicates with the lower ends of the cooling liquid flow passages 36a and 36b, and the cooling liquid flow passages 36a and 36b and the axial extension portion 522 A path extending continuously in the axial direction is formed. Further, the outer side recovery path 52b communicates with the inner end of the radial extending portion 521 and the coolant circulation space 25A through a recovery port 520 formed in the inner surface of the outer peripheral wall 28, and the inner side recovery path 52a. , The radially outer end of the radially extending portion 521 and the coolant circulation space 25A communicate with each other via a recovery port 520 formed on the outer surface of the inner peripheral wall 27.

  Here, as shown in FIG. 3, the outer side recovery path 52b is formed at positions corresponding to both ends in the circumferential direction of the permanent magnet 34b (see FIG. 3) arranged in the circumferential direction of the outer rotor 30b. The side collection path 52a is formed at a position corresponding to both ends in the circumferential direction of a permanent magnet 34a (see the same figure) disposed in the circumferential direction of the inner rotor 30a. That is, two outer side recovery paths 52b and two inner side recovery paths 52a are formed for each partition space 42.

Next, the flow of the coolant in the flow passages (circulation spaces) provided in the rotors 20, 30a, 30b of the rotary electric machine 1 according to the first embodiment described above will be described.
Due to the pumping of a pump (not shown), the coolant from the main passage 44a of the introduction passage 44 inside the rotating shaft 4 passes through the branch passage 44b and the recovery passage 52 and from the discharge port 510 to the diffusion space 42a of the coolant circulation space 25A. Released (introduced).

  The coolant discharged from the discharge port 510 to the diffusion space 42a is diffused throughout the diffusion space 42a by flowing from the inner diameter side to the outer diameter side of the diffusion space 42a by the centrifugal force of the rotor 2A in addition to the pumping force by the pump. (See FIGS. 2 and 3). As a result, the cooling liquid diffused into the diffusion space 42a flows into the outer-side recovery passage 52b through the outer-side recovery port 520 formed in the diffusion space 42a, and at the same time the inner-side recovery passage 52a through the inner-side recovery port 520. Flow into.

  Here, since the coolant discharged from the radially inner discharge port 510 in the diffusion space 42a flows toward the radially outer side due to the centrifugal force, the outer recovery port 520 causes the coolant flowing toward the radially outer side to flow through the diffusion space. It is possible to recover efficiently by waiting from the outside of the diameter of 42a.

  Further, as shown in FIGS. 2 and 3, the coolant that has flowed to the outside of the diffusing space 42a is diverted to the outside of the radius through the gap Sa with the outer peripheral wall 28 of the inside partition wall 29a to the aggregated space 42b. Flows in.

  The coolant that has flowed into the collecting space 42b flows into the outer collecting path 52b through the outer collecting port 520 provided in the collecting space 42b, and against the centrifugal force of the rotor 2A by the pumping force of the pump. By flowing from the radially outer side to the radially inner side in 42b, it flows into the inner recovery path 52a through the inner recovery port 520 of the aggregated space 42b.

  At this time, in the aggregation space 42b, there is no cooling liquid that is discharged from the discharge port 510 and diffuses from the inside diameter to the outside diameter like the diffusion space 42a. Thus, the coolant can be collected inward by the pumping force of the pump and collected by the inner collection path 52a.

  In this manner, the coolant circulation space 25A is partitioned in the circumferential direction by the radially inner partition wall 29a having the gap Sa between the outer peripheral wall 28 and the diffusion space on one side in the circumferential direction with respect to the radially inner partition wall 29a. By forming 42a and forming the aggregation space 42b on the other side, the cooling liquid discharged from the discharge port 510 to the cooling liquid circulation space 25A is excessively caused on the outer side of the cooling liquid circulation space 25A by the centrifugal force of the rotor 2A. The bias can be mitigated, and the cooling effect of both the outer side rotor 30b and the inner side rotor 30a can be obtained.

  Further, the coolant recovered by the recovery paths 52b and 52a on the outer side and the inner side by the pumping force of the pump passes through the coolant flow paths 36b and 36a (flux barriers) of the outer rotor 30b and the inner rotor 30a. Outer side corresponding to each by flowing from the end on the axially opposed rotor 20 side (lower end in FIGS. 2 and 4) toward the opposite end in the axial direction (upper end in FIGS. 2 and 4). The permanent magnets 34b and 34a provided in the rotor 30b and the inner rotor 30a can be cooled.

  Note that the coolant flows out from the upper ends of the coolant flow passages 36a and 36b to the outside of the radially opposed rotor 30. However, the coolant 21 is appropriately provided in the housing 21 of the rotating electrical machine 1 or the like. A drainage channel (not shown) that receives and discharges the coolant flowing out from the upper end may be provided.

  The rotating electrical machine 1 according to the first embodiment described above includes the stator 9 and the axially opposed rotor 20 that rotates together with the rotating shaft 4 and is disposed to face the stator 9 in the axial direction of the rotating shaft 4. An axial gap type rotating electrical machine, in which radial opposed rotors 30 (30a, 30b) that rotate in one piece with the axially opposed rotor 20 are disposed so as to be opposed to the stator 9 in the radial direction at axially arranged stator locations. Further provided (see FIG. 1, FIG. 2, FIG. 4), coolant flow passages 36a and 36b are formed in the radially opposed rotor 30 so as to penetrate in the axial direction (see FIG. 4). A coolant introduction passage 44 is formed extending in the axial direction from the opposite side of the stator 20 to the position corresponding to the axially opposed rotor 20 with respect to the opposed rotor 20 (see FIG. 4). Placement side and anti A jacket member 25 that covers the end portion on the side, and the jacket member 25 has a coolant circulation space that expands in correspondence with a permanent magnet arrangement region 24z in which a plurality of permanent magnets 24 are arranged in the circumferential direction on the stator arrangement side surface 20a. 25A is formed (see FIGS. 2 to 4), the discharge path 51 through which the jacket member 25 communicates with the introduction path 44 and the coolant circulation space 25A and the coolant is discharged to the coolant circulation space 25A, and the coolant circulation. A recovery path 52 (52a, 52b) for connecting the space 25A and the coolant flow passages 36a, 36b to recover the coolant in the coolant circulation space 25A is formed (see the figure).

  According to the above configuration, each of the rotors 20, 30a, and 30b can be efficiently cooled not only in the one axially opposed rotor 20 but also in the axial gap type rotating electrical machine 1 that includes the radially opposed rotor 30. .

  More specifically, the axially opposed rotor 20 can be cooled by the coolant discharged from the introduction passage 44 of the rotating shaft 4 through the discharge passage 51 to the coolant circulation space 25A.

  The coolant in the coolant circulation space 25A is recovered by the recovery passage 52 (52a, 52b), and can be cooled to the radially opposed rotor 30 (30a, 30b) by flowing into the coolant flow passages 36a, 36b. .

  As described above, the coolant is individually drawn into the coolant flow space 25A formed in the axially opposed rotor 20 and the coolant flow passages 36a and 36b formed in the radially opposed rotor 30 from the introduction path 44 of the rotating shaft 4. Even if not, the coolant once drawn into the discharge passage 51 from the introduction path 44 of the rotating shaft 4 can be circulated so as to circulate from the coolant circulation space 25A to the coolant flow paths 36a and 36b (cooling in FIG. 2). (See arrow indicating liquid flow).

  As a result, not only one axially opposed rotor 20 but also an axial gap type rotary electric machine 1 having a complicated rotor structure including the radially opposed rotor 30, the axially opposed rotor 20 and the radially opposed rotor 30 are provided. Each of these can be cooled efficiently.

  That is, when the coolant flows through the introduction path 44 formed in the axial direction of the rotating shaft 4, the coolant does not contribute to the cooling of the rotors 20 and 30, so the coolant is axially opposed with the permanent magnet 24 to be cooled. The axially opposed rotor 20 can be efficiently cooled by drawing and flowing into the rotor 20 from the introduction path 44 in which the path is formed as short as possible.

  Furthermore, since the coolant introduced from the introduction passage 44 of the rotating shaft 4 can be circulated through the coolant circulation space 25A to the coolant flow passages 36a and 36b, the coolant is formed in the axial direction of the rotating shaft 4. Since the path of the introduction path 44 can be shortened as much as possible, it is possible to suppress an increase in processing cost associated with the formation of the introduction path 44 in the rotating shaft 4.

  As an aspect of the present invention, the radially opposed rotor 30 includes a plurality of permanent magnets 24 arranged side by side in the circumferential direction, and the coolant flow passages 36 a and 36 b are permanent magnets adjacent in the circumferential direction of the radially opposed rotor 30 ( 34a, 34a, 34b, 34b) (see FIG. 3).

  According to the said structure, between the permanent magnets 34a and 34b adjacent in the circumferential direction is equivalent to the position where the density of the magnetic flux which flows from the permanent magnet 24 to the coil 92 of the stator 9 becomes high. It becomes a part which is easy to get hot. Therefore, as described above, by providing the coolant flow passages 36a and 36b so as to penetrate in the axial direction between the permanent magnets 34a and 34b adjacent in the circumferential direction of the radially opposed rotor 30, the radially opposed rotor is provided. The permanent magnets 34a and 34b included in the 30 can be efficiently cooled.

  In particular, as in the present embodiment, flux barrier holes (voids) formed in the axial direction as a countermeasure against leakage flux are applied to the end portions in the width direction of the flat permanent magnets 34a and 34b as the coolant flow passages 36a and 36b. By doing so, the circumferentially opposite ends of the plate-like permanent magnets 34a and 34b, which are easily heated, can be effectively used without forming a hole for forming the coolant flow passages 36a and 36b in the radially opposed rotor 30. Can be cooled to.

  Further, as an aspect of the present invention, the jacket member 25 includes an inner peripheral wall 27 that is externally fitted to the rotary shaft 4 and an outer peripheral wall 28 that is externally fitted to the rotor core 23 provided in the axially opposed rotor 20 (FIG. 3, As shown in FIG. 4, the radially opposed rotor 30 includes an inner rotor 30 a disposed to face the stator 9 on the radially inner side at a position corresponding to the inner peripheral wall 27 provided in the axially opposed rotor 20 in the radial direction. Provided (see FIG. 4), the coolant circulation space 25A is continuously formed in the circumferential direction between the inner peripheral wall 27 and the outer peripheral wall 28 (see FIG. 3), and the discharge path 51 and the recovery path 52a are the inner peripheral wall. The jacket member 25 has a cooling liquid diffusion space 42 a communicating with the discharge path 51 and a cooling liquid collecting space 42 b communicating with the recovery path 52. Cold to be formed A partition wall 29 that partitions the liquid circulation space 25 </ b> A in the circumferential direction is provided, and the radially inner partition wall 29 a that partitions the diffusion space 42 a and the aggregation space 42 b extends radially outward from the inner peripheral wall 27 and between the outer peripheral wall 28. A gap Sa is provided (see FIGS. 2 and 3).

  According to the above configuration, the cooling liquid is discharged from the introduction path 44 of the rotating shaft 4 to the diffusion space 42 a through the discharge path 51 provided in the inner peripheral wall 27. Then, the cooling liquid diffuses from the inner diameter side to the outer diameter side due to the centrifugal force accompanying the rotation of the rotor 2A in the diffusion space 42a, and further, the cooling liquid diffused from the outer diameter diameter to the outer diameter wall of the diffusion space 42a 28 flows into the aggregating space 42b through the gap Sa between the gas and the gas 28, and flows through the aggregating space 42b from the outer diameter side to the inner diameter side against the centrifugal force by the pumping force of the pump.

  At this time, since the diffusion space 42a and the aggregated space 42b are partitioned by the radially inner partition wall 29a, the coolant that diffuses radially outward when the coolant flows from the radially outer side to the radially inner side in the aggregated space 42b. The flow to the inside of the diameter is recovered in the recovery path 52a without being obstructed (see FIGS. 2 and 3).

  Therefore, for example, the cooling liquid once diffused to the outside in the radial direction of the cooling liquid circulation space 25A does not continue to be retained by the centrifugal force on the outside of the diameter, and the cooling liquid is discharged from the discharge passage 51 in the cooling liquid circulation space 25A. Circulates in the entire coolant circulation space 25A until it is recovered mainly by the inner recovery passage 52a, and after circulating through the coolant circulation space 25A while efficiently cooling the permanent magnet 24 provided in the axially opposed rotor 20 The coolant can be reliably recovered mainly by the recovery path 52a on the inner side.

  Further, since the coolant recovered by the recovery path 52a further flows through the coolant flow passage 36a of the inner rotor 30a that is axially opposed to the inner peripheral wall 27, the coolant is passed to the rotating shaft 4 on the inner rotor. Since it is not necessary to flow through the long introduction path 44 extended to the rotating shaft 4 until reaching the inner rotor 30a in order to lead to 30a, the permanent magnet 34a provided in the inner rotor 30a is also efficiently cooled. Can do.

  Further, as an aspect of the present invention, the radially opposed rotor 30 includes a radially outer side with respect to the stator 9 at a position corresponding to the outer peripheral wall 28 (see FIGS. 3 and 4) provided in the axially opposed rotor 20 in the radial direction. (See FIGS. 2 and 4), the outer side recovery path 52b in which the coolant flow passages 36a and 36b formed on the outer side rotor 30b side communicate with the upper end side thereof is The inner diameter end side is provided on the outer peripheral wall 28 so as to communicate with at least the diffusion space 42a in the coolant circulation space 25A (see the same figure).

  According to the above configuration, the recovery path 52 is provided on the outer peripheral wall 28 so that the inner diameter end thereof communicates with the coolant circulation space 25A in the diffusion space 42a. Therefore, the rotor is moved radially outward from the discharge port 510 in the diffusion space 42a. The coolant that diffuses due to the centrifugal force accompanying the rotation of 2A can be efficiently recovered by the recovery path 52b.

  That is, the coolant recovered by the outer recovery passage 52b can be actively flowed to the coolant flow passage 36b of the outer rotor 30b facing the outer peripheral wall 28, and the efficiency of the permanent magnet 34b of the outer rotor 30b is also improved. Can cool well.

  Further, it is not necessary to extend the introduction path 44 of the rotating shaft 4 in the axial direction in order to introduce the cooling liquid from the introduction path 44 to the cooling liquid flow paths 36a and 36b of the radially opposed rotor 30. The increase in the processing cost accompanying this can be suppressed.

(Second Embodiment)
FIG. 5 is an external view of an axial gap type rotating electrical machine according to the second embodiment, FIG. 6 is an explanatory view schematically showing a flow passage through which a coolant provided in the first rotor of the second embodiment flows, and FIG. FIG. 8 is a cross-sectional view taken along the line D-D in FIG. 6, illustrating the configuration and operation of the jacket member shown by a cross-section orthogonal to the axial direction of the jacket member, and FIG. FIG. 9 is a cross-sectional view taken along the line EE of FIG. 6, illustrating the configuration and operation of the jacket member.
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.

  A stator 9P provided in an axial gap type rotating electrical machine 1P according to the second embodiment (hereinafter referred to as “rotating electrical machine 1P”) includes a plurality of core coil sets 91P arranged in a circumferentially arranged state. The set 91P includes a body portion 91Pa, and an arm portion 31Pb that extends linearly to both sides in the axial direction with respect to the body portion 91Pa and is bent toward the inside in the radial direction.

  The rotating electrical machine 1P according to the second embodiment is also a 2-rotor 1-stator type rotating electrical machine, and the two rotors 2P (the first rotor 2PA and the second rotor 2PB) provided in the rotating electrical machine 1P are similar to each other. Since it is configured, the following description is based on the configuration of the first rotor 2PA (hereinafter simply referred to as “rotor 2PA”).

  As shown in FIGS. 6 and 8, the rotor 2PA does not include the outer side rotor 30b as the radially opposed rotor 30P, but includes only the inner side rotor 30Pa. Furthermore, the rotor 2PA is provided with axially opposed rotors 20Pa and 20Pb on both sides in the axial direction, whereby the rotor 2PA has a groove portion 22P (see FIG. 8) that is both recessed in the radial direction around the rotating shaft 4P. It is formed to do.

  As shown in FIGS. 7 and 8, the axially opposed rotors 20Pa and 20Pb of the second embodiment form a recovery path 52 including the recovery port 520 as in the first embodiment on the outer peripheral walls 28 and 28P. However, the configuration is basically the same as that of the axially opposed rotor 20 of the first embodiment described above except that the radial thickness is thin.

  Of the axially opposed rotors 20Pa and 20Pb provided on both sides in the axial direction, the axially opposed rotor 20Pa on the trunk portion 91Pa side (lower side in FIG. 8) of the stator 9P in the axial direction is replaced with the first axially opposed rotor 20Pa. And the axially opposed rotor 20Pb on the side opposite to the body 91Pa side (upper side in FIG. 8) of the stator 9P in the axial direction is set as the second axially opposed rotor 20Pb.

  The second axially opposed rotor 20Pb is configured in the same shape as the first axially opposed rotor 20Pa, and is disposed in a posture in which the first axially opposed rotor 20Pa is turned upside down.

  As shown in FIG. 8, the stator core 93P provided in the stator 9P described above and the rotors 30Pa, 20Pa, and 20Pb provided in the rotor 2PA are formed of the stator core 93P that constitutes the arm portion 91Pb in the bent core coil set 91P. In the state where the tip end portion of the stator core 93P is inserted into the groove 22P of the rotor 2PA, the axial end surface 93Pa, the axial inner side surface 93Pc, and the axial outer side surface 93Pb of the stator core 93P are the outer peripheral surface 31Paa of the inner rotor 30Pa. The first axially opposed rotor 20Pa faces the stator core 93P facing surface 20Paa (upper surface in FIG. 8), and the second axially opposed rotor 20Pb faces opposite the stator core 93P 20Pba (lower surface in FIG. 8). Are arranged to face each other.

  Thereby, a magnetic field can be generated in the gap between the rotor 2PA and the stator core 93P, and the permanent magnets 34Pa (see FIG. 7), 24Pa, 24Pb (see FIG. 8) provided in the rotors 30Pa, 20Pa, and 20Pb. The generated magnetic field further interacts with the magnetic field generated by the armature current of the stator 9P to generate torque.

  Further, as shown in FIG. 8, the rotation shaft 4P corresponds to the second axially opposed rotor 20Pb from the side opposite to the stator arrangement side (the upper side in FIG. 8) with respect to the second axially opposed rotor 20Pb. A cooling liquid lead-out path 45 extending in the axial direction is formed.

  As shown in the drawing, the lead-out path 45 has one main passage 45a extending in the axial direction to the upper front position of the position corresponding to the second axially opposed rotor 20Pb in the rotation shaft 4P, and the main passage 45a. And four branch passages 45b that branch from the lower end.

  As shown in FIGS. 6 and 7, the second axially opposed rotor 20Pb is configured in the same shape as the first axially opposed rotor 20Pa as described above, and the first axially opposed rotor 20Pa is turned upside down. It is arranged with the posture which let you. However, the diffusion space 42a and the aggregation space 42b that divide the coolant circulation space 25A in the second axially opposed rotor 20Pb are set to be opposite to those in the first axially opposed rotor 20Pa (see FIGS. 7 and 9). .

Further, as shown in FIG. 7, in the second axially opposed rotor 20Pb, the flow paths corresponding to the discharge path 51 of the first axially opposed rotor 20Pa and the recovery path 52a on the inner side are the recovery path 52P and the discharge path 51P, respectively. In the second axially opposed rotor 20Pb, the openings corresponding to the discharge port 510 and the recovery port 520 of the first axially opposed rotor 20Pa are set to the recovery port 520P and the discharge port 510P, respectively.
That is, in the second axially opposed rotor 20Pb, the coolant flow passage 36a and the coolant circulation space 25A communicate with each other via the discharge passage 51P, and the coolant circulation space 25A and the discharge passage 45 via the recovery passage 52P. Are configured to communicate with each other (see FIGS. 7 and 8).

Next, the flow of the coolant in the flow passages (distribution spaces) provided in the rotors 30Pa, 20Pa, and 20Pb of the rotor 2PA of the rotary electric machine 1P according to the second embodiment described above will be described.
However, the description of the same part as the flow of the coolant flowing in the flow passages (flow spaces) provided in the rotors 20, 30a, 30b of the rotor 2A of the rotary electric machine 1P of the first embodiment described above will be omitted.

  As shown in FIGS. 6 and 9, the cooling liquid introduced from the introduction path 44 inside the rotary shaft 4P and discharged from the discharge path 51 to the cooling liquid circulation space 25A by the pumping of the pump (not shown) is mainly performed. In the diffusion space 42a of the first axially opposed rotor 20Pa, it is diffused radially outward, flows into the aggregated space 42b through the gap Sa between the radially inner partition wall 29a and the outer peripheral wall 28P, and is aggregated radially inward in the aggregated space 42b. The permanent magnet 24Pa (see FIG. 8) provided in the first axially opposed rotor 20Pa is cooled and recovered by the recovery path 52a.

  Then, as shown in FIG. 6, the coolant flowing into the coolant flow passage 36a (flux barrier) of the inner rotor 30Pa from the recovery passage 52a flows in the axial direction from the lower end to the upper end of the coolant flow passage 36a. The permanent magnet 34Pa (see FIGS. 7 and 9) provided in the inner rotor 30Pa is cooled and recovered to the second axially opposed rotor 20Pb side.

Further, the coolant flowing into the discharge passage 51P on the second axially opposed rotor 20Pb side from the coolant flow passage 36a mainly flows through the coolant in the second axially opposed rotor 20Pb as shown in FIGS. Like the coolant circulation space 25A of the first axially opposed rotor 20Pa, the space 25A is discharged from the discharge port 510P and diffused radially outward in the diffusion space 42a, and between the radially inner partition wall 29a and the outer peripheral wall 28P. The air flows into the aggregated space 42b through the gap Sa, and is aggregated radially inward in the aggregated space 42b. The permanent magnet 24b (see FIG. 8) provided in the second axially opposed rotor 20Pb is cooled and recovered by the recovery path 52P.
The coolant recovered by the recovery path 52P of the second axially opposed rotor 20Pb is led out from the lead-out path 45 inside the rotating shaft 4P.

  The rotating electrical machine 1P according to the second embodiment described above includes the first axially opposed rotor 20Pa as the axially opposed rotor 20P and the second axially opposed rotor 20Pb having the same shape as the first axially opposed rotor 20P (see FIG. 5), the rotating shaft 4P includes a coolant extending in the axial direction from the opposite side (upper side) of the stator 9P to the second axially opposed rotor 20Pb to a position corresponding to the second axially opposed rotor 20Pb. In the second axially opposed rotor 20Pb, the coolant flow passage 36a and the coolant circulation space 25A communicate with each other via the discharge passage 51P, and the coolant circulation space via the recovery passage 52P. 25A and the lead-out path 45 are configured to communicate with each other (see FIGS. 6 to 8).

  According to the above configuration, the second axially opposed rotor 20Pb can be cooled by the coolant discharged from the coolant flow passage 36a to the coolant circulation space 25A via the discharge passage 51P, and the coolant circulation space 25A. The cooling fluid flowing through is recovered by the recovery path 52P, and can flow through the recovery path 52P to the outlet path 45 formed on the rotating shaft 4P.

  For this reason, the second axially opposed rotor 20Pb also has excellent cooling performance with respect to the permanent magnet 24b in the same manner as the first axially opposed rotor 20Pa, and the first axially opposed rotor 20Pa and the second axially opposed rotor 20Pb and the inner rotor 30Pa do not individually take in the cooling liquid from the introduction path 44 of the rotating shaft 4P, but take in the cooling liquid from the introduction path 44 of the rotating shaft 4P to the first axially opposed rotor 20Pa. Coolant is circulated so as to circulate in the order of the one axially opposed rotor 20Pa, the inner side rotor 30Pa, and the second axially opposed rotor 20Pb, and then cooled from the second axially opposed rotor 20Pb to the lead-out path 45 of the rotating shaft 4P. A configuration for deriving the liquid is adopted (see FIG. 6).

  Thus, in the axial gap type rotating electrical machine 1P including the two axially opposed rotors 20P (the first axially opposed rotor 20Pa and the second axially opposed rotor 20Pb) and the radially opposed rotor 30P (the inner side rotor 30Pa). The rotors 20Pa, 20Pb, and 30Pa can be efficiently cooled.

  Further, the coolant flowing through the introduction path 44 of the rotating shaft 4P is used to cool the coolant flowing space 25A of the first axially opposed rotor 20Pa, the coolant flow passage 36a of the inner rotor 30Pa, and the second axially opposed rotor 20Pb. Since it can be made to distribute | circulate to the derivation | leading-out path 45 via the liquid distribution space 25A, the path | route of the introduction path 44 and the derivation | lead-out path 45 formed in the axial direction of the rotating shaft 4P can be shortened as much as possible. It is possible to suppress an increase in processing cost associated with forming the lead-out path 45 on the rotating shaft 4P.

  The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

In the correspondence between the configuration of the present invention and the above-described embodiment, the inner peripheral wall provided in the axially opposed rotor of the present invention corresponds to the inner peripheral wall 27 of the embodiment.
Although the outer peripheral portion provided in the axially opposed rotor corresponds to the outer peripheral wall 28, the present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

DESCRIPTION OF SYMBOLS 1,1P ... Axial gap type rotary electric machine 9, 9A ... Stator 4, 4A ... Rotating shaft 20, 20P ... Axial opposed rotor 30, 30P ... Radially opposed rotor 36a, 36b ... Cooling liquid flow path 20a ... Stator arrangement side end face 20 Pa ... 1st axial direction opposing rotor 20Pb ... 2nd axial direction opposing rotor 24, 34a, 34b, 24Pa, 24Pb, 34Pa ... Permanent magnet 24z ... Permanent magnet arrangement area 25 ... Jacket member 25A ... Coolant circulation space 27 ... Inner peripheral wall 28 ... Outer peripheral wall 29 ... Partition walls 30a, 30Pa ... Inner rotor 30b ... Outer rotor 42a ... Diffusion space 42b ... Aggregation space 44 ... Inlet passage 45 ... Outlet passage 51, 51P ... Discharge passage 52, 52P ... Recovery passage

Claims (5)

An axial gap type rotating electrical machine comprising a stator and an axially opposed rotor that rotates together with the rotating shaft and is disposed opposite to the stator in the axial direction of the rotating shaft,
A radial opposed rotor that is disposed radially opposite to the stator at the axial stator placement location and rotates integrally with the axially opposed rotor;
A coolant flow passage is formed in the radially opposed rotor so as to penetrate in the axial direction.
The rotating shaft is formed with a coolant introduction path extending in the axial direction from the side opposite to the stator arrangement side to the position corresponding to the axially opposed rotor with respect to the axially opposed rotor.
The axially opposed rotor includes a jacket member that covers an end opposite to the stator arrangement side, and the jacket member has a permanent magnet arrangement region in which a plurality of permanent magnets are arranged in the circumferential direction on the stator arrangement side end surface. A correspondingly expanding coolant circulation space is formed,
The cooling passage is communicated with the jacket member through the introduction passage and the coolant circulation space, and the discharge passage through which the coolant is discharged to the coolant circulation space, and the coolant circulation space and the coolant flow passage. An axial gap type rotating electrical machine in which a recovery path for recovering the coolant in the liquid circulation space is formed. The radially opposed rotor includes a plurality of permanent magnets arranged side by side in the circumferential direction,
The axial gap type rotating electrical machine according to claim 1, wherein the coolant flow passage is provided between at least one pair of permanent magnets adjacent in the circumferential direction of the radially opposed rotor. The jacket member includes an inner peripheral wall that is externally fitted to the rotating shaft, and an outer peripheral wall that is externally fitted to a core provided in the axially opposed rotor.
The radially opposed rotor includes an inner rotor disposed opposite to the stator on the radially inner side at a position corresponding to an inner circumferential portion provided in the axially opposed rotor in the radial direction,
The coolant circulation space is formed continuously in the circumferential direction between the inner peripheral wall and the outer peripheral wall,
The discharge path and the recovery path are provided at different positions in the circumferential direction of the inner peripheral wall,
The jacket member has a partition wall that divides the cooling liquid circulation space in the circumferential direction so that a cooling liquid diffusion space communicating with the discharge path and a cooling liquid collecting space communicating with the recovery path are formed. Prepared,
The axial gap type rotating electric machine according to claim 1 or 2, wherein the partition wall that partitions the diffusion space and the aggregated space extends radially outward from the inner peripheral wall and has a gap between the outer peripheral wall and the outer peripheral wall. . The radially opposed rotor includes an outer rotor disposed opposite to the stator on the radially outer side at a position corresponding to an outer peripheral portion provided in the axially opposed rotor in the radial direction,
The outer side recovery path formed on the outer rotor side and communicated with one end side of the coolant flow passage is provided on the outer peripheral wall so that the other end side communicates with at least the diffusion space in the coolant circulation space. The axial gap type rotating electrical machine according to claim 3. The axially opposed rotor is set as a first axially opposed rotor;
A second axially opposed rotor having the same structure as the first axially opposed rotor is disposed on the opposite side of the first axially opposed rotor with respect to one stator in the axial direction;
The rotation shaft is formed with a cooling liquid lead-out path extending in the axial direction from the opposite side of the stator arrangement side to the second axially opposed rotor to a position corresponding to the second axially opposed rotor.
In the second axially opposed rotor, the coolant flow passage and the coolant circulation space communicate with each other through the discharge passage, and the coolant circulation space and the lead-out passage communicate with each other through the recovery passage. The axial gap type rotating electrical machine according to claim 1, wherein the axial gap type rotating electrical machine is configured as described above.

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