JP2006050752A - Stator cooling structure of disk rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator cooling structure of a disk rotary electric machine, wherein power loss due to the viscosity resistance of a coolant is avoided and further degradation in reliability due to deterioration of insulation in coils or stator cores is prevented. <P>SOLUTION: A disk rotary electric machine includes a rotor 2, in which permanent magnets 9 are placed and a stator 3 in which multiple stator cores 11 are placed on the circumference. The rotor 2 and the stator 3 are disposed in the axial direction. The stator 3 includes the stator cores 11, coils 12, and an insulating member 3 placed around the stator cores 11. A coolant passage 20 is provided in part of the insulating member 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention belongs to the technical field of a stator cooling structure for a disk-type rotating electrical machine in which a stator and a rotor are arranged to face each other in the axial direction.

  The permanent magnet synchronous motor (IPMSM: Interior Permanent Magnet Synchronus Motor) with a permanent magnet embedded in the rotor and the surface magnet synchronous motor (SPMSM: Surface Permanent Magnet Synchronus Motor) with a permanent magnet attached to the rotor surface have low loss. Due to its high efficiency and large output (in addition to magnet torque, reluctance torque can also be used), its application range has been expanded to applications such as electric vehicle motors and hybrid vehicle motors.

Such a permanent magnet synchronous motor, in which a stator and a rotor are arranged opposite to each other in the axial direction to generate a rotating magnetic field parallel to the rotating shaft, can be reduced in thickness and limited in layout. It is used for a certain purpose. As a cooling method for this disk type motor, an air cooling method is generally used, but there is also known a method in which oil (refrigerant) is introduced into a motor case and the motor case is filled with a refrigerant (for example, Patent Document 1).
JP-A-10-243617

  However, in the conventional disk type motor, the cooling liquid is filled inside, and the coil and the rotor are always in contact with the cooling liquid. There is a risk that insulation deterioration may occur, and the motor reliability is lowered. In addition, since the rotor rotates in a state filled with the cooling liquid, there is a problem that power loss due to the viscous resistance of the cooling liquid cannot be avoided.

  The present invention has been made by paying attention to the above-mentioned problem, and it is possible to prevent the loss of reliability due to the insulation deterioration of the coil and the stator core while avoiding the power loss due to the viscous resistance of the refrigerant. The purpose is to provide a structure.

In order to achieve the above object, in the present invention, a disk type comprising a rotor in which permanent magnets are arranged and a stator in which a plurality of stator cores are arranged on the circumference, wherein the rotor and the stator are arranged in the axial direction. In rotating electrical machines,
The stator has a stator core, a coil, and an insulating member arranged around the stator core or around the coil, and a refrigerant passage is provided in a part of the insulating member.

  Therefore, in the stator cooling structure for a disk-type rotating electrical machine according to the present invention, the refrigerant for cooling the coil is a hermetically sealed inter-core refrigerant path disposed between the stator cores adjacent to each other as the heating element. Since it flows through, it is possible to cool the coil effectively. In addition, the refrigerant that cools the coil flows through the sealed coil refrigerant path and does not flow into the air gap between the rotor and the stator, so that the friction is not increased. As a result, it is possible to prevent a decrease in reliability due to deterioration of insulation of the coil and the stator core while avoiding power loss due to the viscous resistance of the refrigerant.

  Hereinafter, the best mode for carrying out a stator cooling structure for a disk-type rotating electrical machine according to the present invention will be described based on Examples 1 to 4 shown in the drawings.

First, the overall configuration will be described.
FIG. 1 is an overall cross-sectional view showing a disk-type rotating electrical machine having one rotor and two stators to which the stator cooling structure of Embodiment 1 is applied.

  The disk-type rotating electrical machine according to the first embodiment includes a rotating shaft 1, a rotor 2, stators 3 and 3, and a rotating electrical machine case 4 (case). The rotating electrical machine case 4 includes a front side case. 4a, a rear side case 4b, and an outer peripheral case 4c bolted to both side cases 4a and 4b.

  The rotary shaft 1 is rotatably supported by a first bearing 5 provided on the front side case 4a and a second bearing 6 provided on the rear side case 4b.

  The rotor 2 is fixed to the rotating shaft 1 and generates a reaction force on the permanent magnets 9 and 9 with respect to the rotating magnetic flux applied from the stators 3 and 3, and rotates about the rotating shaft 1. The rotor base 8 is made of an electromagnetic steel plate (ferromagnetic material) fixed to 1, and a plurality of permanent magnets 9 and 9 are embedded in the facing surfaces of the stators 3 and 3. The plurality of permanent magnets 9 and 9 are arranged such that adjacent surface magnetic poles (N pole and S pole) are different from each other. Here, a gap called air gaps 10 and 10 exists between the rotor 2 and the stators 3 and 3 and does not contact each other.

  The stators 3 and 3 are respectively fixed to the front side case 4a and the rear side case 4b, and include a stator core 11, a coil 12, and an insulating member 13. The coil 12 is concentratedly wound around the stator core 11 via an insulating member 13. The stator cores 11 and 11 are fixed to the front side case 4a and the rear side case 4b, respectively.

Next, the stator cooling structure of Example 1 will be described with reference to FIGS. 2 is a longitudinal front view showing a stator to which the stator cooling structure of the first embodiment is applied, and FIG. 3 is a vertical side view showing the stator taken along line AA of FIG. 2 to which the stator cooling structure of the first embodiment is applied. is there.
The stator cooling structure according to the first embodiment is configured by providing a refrigerant passage 20 in a part of the insulating member 13 disposed around the stator core 11. The refrigerant passage 20 is provided by embedding a refrigerant pipe 21 made of a nonmagnetic material in the insulating member 13.

  As shown in FIG. 3, both ends of the refrigerant pipe 21 protrude from the insulating member 13 and are embedded in the insulating member 13, and both ends of the protruding refrigerant pipe 21 are connected to the front side case 4a and the rear side. The refrigerant was connected to the refrigerant supply path and the refrigerant discharge path formed in the case 4b.

  A front-side end plate 22a and a rear-side end plate 22b are fixed to the front-side side case 4a and the rear-side side case 4b, respectively, and a refrigerant inlet port 23 and a refrigerant outlet port 24 are respectively connected to both the end plates 22a and 22b. And set.

  An annular refrigerant supply jacket 25 for supplying refrigerant from the refrigerant inlet port 23 to the front side case 4a and the rear side case 4b; and an annular refrigerant discharge jacket 26 for discharging refrigerant to the refrigerant outlet port 24; , An axial discharge refrigerant passage 27 communicating with the refrigerant discharge jacket 26 is formed.

  The refrigerant pipe 21 has one end connected to the refrigerant supply jacket 25 formed in each of the side cases 4a and 4b and the other end of the both side cases 4a and 4b. It connected to the refrigerant | coolant communication member 28 fixed to each of 4b.

  The refrigerant communication member 28 communicates with the refrigerant passage 20 formed in the refrigerant pipe 21, the discharge refrigerant passage 27 and the refrigerant discharge jacket 26 formed in the both side cases 4a and 4b, and the direction of the refrigerant flows in the rotor. 2 has a refrigerant return passage 29 that changes in the radial direction at a position near the opposite side.

  As shown in FIG. 2, the stator core 11 has a cross-sectional shape orthogonal to the rotary shaft 1 by laminating electromagnetic steel plates having a narrow circumferential width from the inside and laminating electromagnetic steel plates having a wide circumferential width on the way. Is T-shaped.

  As shown in FIG. 2, the insulating members 13, 13 have a pair of right-angled triangles formed when the coil 12 is wound around the stator core 11 having a T-shaped cross section. is there.

  As shown in FIGS. 2 and 3, the refrigerant pipes 21 and 21 are embedded and set so as to penetrate in the axial direction with respect to each of the insulating members 13 and 13 having a pair of triangular cross sections. In addition, the seal | sticker of the refrigerant | coolant is ensured by setting an O-ring in a required location, as shown in FIG.

Next, the operation will be described.
First, when continuous operation of a rotating electric machine with high output is performed, heat is generated in the stator due to copper loss and iron loss, and the temperature of the coil rises with time. In addition, the permanent magnet on the rotor generates heat due to induction of eddy current inside the magnet, and the ambient temperature in the rotating electrical machine is also high. For this reason, in order to ensure the continuous operation by high output, it is necessary to cool the stator.

  As a countermeasure, when general air cooling is adopted in a rotating electrical machine, the heat removal performance is poor. Therefore, in a high-output rotating electrical machine, the coil temperature rises and the continuous output time is shortened. On the other hand, when a refrigerant is introduced into a rotating electrical machine as a cooling method (for example, Japanese Patent Laid-Open No. 10-243617), the rotor rotates in a state filled with the refrigerant, so that power loss due to the viscous resistance of the refrigerant is avoided. In addition, since the coil and the rotor are always in contact with the refrigerant, the coil and the stator core are deteriorated in insulation and the reliability is lowered.

  On the other hand, in the stator cooling structure of the first embodiment, the insulating member 13 disposed around the stator core 11 is used, and the refrigerant passage 20 is provided in a part of the insulating member 13 so that the power loss due to the viscous resistance of the refrigerant. As a result of preventing the deterioration of reliability due to insulation deterioration of the coil 12 and the stator core 11 and improving the cooling efficiency, the continuous output is greatly increased.

  The stator cooling operation of the first embodiment will be described. First, the refrigerant is supplied from the refrigerant inlet port 23 to the annular refrigerant supply jacket 25, led from the refrigerant supply jacket 25 to the refrigerant passage 20 of each refrigerant pipe 21, and the stator 3. Cool down. That is, the heat due to the copper loss of the coil 12 is transmitted to the insulating member 13 in contact with the coil 12, and the heat due to the iron loss of the stator core 11 is transmitted to the insulating member 13 in contact with the stator core 11, whereby the insulating member 13. Becomes hot. On the other hand, when the insulating member 13 is in close contact with the outer peripheral surface of the refrigerant pipe 21, the stator 3 is cooled by a heat extraction action in which the heat of the insulating member 13 that has reached a high temperature is extracted by the refrigerant flowing in the axial direction in the refrigerant pipe 21. Is done.

  Then, the refrigerant that has passed through the refrigerant passage 20 is discharged to the outside through the refrigerant return passage 29 → the discharge refrigerant passage 27 → the refrigerant discharge jacket 26 → the refrigerant outlet port 24. The refrigerant return passage 29 is arranged in the radial direction at a position near the rotor 2 of the stator 3, and the discharge refrigerant passage 27 is arranged at an inner peripheral position close to the stator 3. The refrigerant flowing through the discharge refrigerant passage 27 also exerts a heat removal action for extracting heat from the stator 3.

  As described above, the stator cooling structure of the first embodiment is a structure in which the refrigerant passage 20 is provided in a part of the insulating member 13, and the refrigerant does not directly contact the coil 12 or the stator core 11. Decrease in reliability can be prevented.

  In addition, since the refrigerant pipe 21 made of a nonmagnetic material is embedded in the insulating member 13 and the refrigerant passage 20 is provided, the insulation deteriorates due to the refrigerant penetrating the insulating member 13 and contacting the coil 12 and the stator core 11. It can certainly be avoided. In other words, the degree of freedom in selecting the refrigerant and the insulating member 13 is improved. Further, since the refrigerant pipe 21 is made of a nonmagnetic material, generation of loop current due to rotation of the rotor 2 can be prevented.

  Further, the refrigerant is supplied from the case mounting surface side of the stator core 11, discharged near the surface facing the rotor 2, and returned to the discharge refrigerant passage 27 in the case, so that an external cooling system (not shown) is provided. ), The refrigerant cooled first removes heat from the coil 12 and the stator core 11, so that the cooling effect is high.

Next, the effect will be described.
In the stator cooling structure for the disk-type rotating electrical machine according to the first embodiment, the effects listed below can be obtained.

  (1) A disk-type rotating electrical machine that includes a rotor 2 in which permanent magnets 9 are arranged and a stator 3 in which a plurality of stator cores 11 are arranged on the circumference, and the rotor 2 and the stator 3 are arranged in the axial direction. The stator 3 has a stator core 11, a coil 12, and an insulating member 13 disposed around the stator core 11, and the refrigerant passage 20 is provided in a part of the insulating member 13. While avoiding power loss due to viscous resistance, it is possible to prevent a decrease in reliability due to insulation deterioration of the coil 12 and the stator core 11.

  (2) Since the refrigerant passage 20 is provided by embedding the refrigerant pipe 21 made of a nonmagnetic material in the insulating member 13, the degree of freedom in selecting the refrigerant and the insulating member 13 can be improved by reliably avoiding the deterioration of insulation. At the same time, generation of loop current due to rotation of the rotor 2 can be prevented.

  (3) Both ends of the refrigerant pipe 21 protrude from the insulating member 13 and are embedded in the insulating member 13, and both ends of the protruding refrigerant pipe 21 are formed in the front side case 4a and the rear side case 4b. Since the refrigerant cooled by the external cooling system first removes heat from the coil 12 and the stator core 11, since it is connected to the refrigerant supply path and the refrigerant discharge path, a high stator cooling effect can be obtained.

  (4) An annular refrigerant supply jacket 25 for supplying refrigerant to the front side case 4a and the rear side case 4b, an annular refrigerant discharge jacket 26 for discharging refrigerant, and a shaft communicating with the refrigerant discharge jacket 26 The refrigerant pipe 21 is formed in a refrigerant supply jacket 25 formed at one end of each of the side cases 4a and 4b. The other end portion is connected to a refrigerant communication member 28 fixed to each of the side cases 4a and 4b. The refrigerant communication member 28 includes a refrigerant passage 20 formed in the refrigerant pipe 21 and the both side cases. 4a and 4b communicated with the discharge refrigerant passage 27 and the refrigerant discharge jacket 26, and the flow direction of the refrigerant is the radial direction at a position near the rotor 2 Since the refrigerant return passage 29 is changed into the three-part rotary electric machine case 4, the portion that forms the discharge refrigerant passage 27 in both side cases 4 a and 4 b protrudes integrally in the axial direction, so that the refrigerant is A structure in which the stator core 11 is supplied from the case mounting surface side and returned to the discharge refrigerant passage 27 in the case can be easily obtained.

  (5) The stator core 11 has a T-shaped cross section orthogonal to the rotating shaft 1, and the insulating members 13, 13 are coiled on the stator core 11 having a T-shaped cross section orthogonal to the rotating shaft 1. A pair of right-angled triangles formed when the wire 12 is wound, and the refrigerant pipes 21 and 21 are embedded and set in the axial direction with respect to the insulating members 13 and 13 having a pair of triangular cross sections, respectively. With the two refrigerant pipes 21 and 21 for the set of stator core 11 and coil 12, the stator can be cooled with a high heat removal effect.

  The second embodiment is an example in which the rotating electrical machine case is divided into two parts and emphasis is placed on the cooling of the stator outer peripheral side.

  Explaining the configuration, FIG. 4 is an overall cross-sectional view showing a disk-type rotating electrical machine having one rotor and two stators to which the stator cooling structure of the second embodiment is applied.

  The disk-type rotating electrical machine according to the second embodiment includes a rotating shaft 1, a rotor 2, stators 3 and 3, and a rotating electrical machine case 4 (case). The rotating electrical machine case 4 includes a pair of first rotating electrical machines. A two-part structure is formed by the case 4d and the second case 4e. Since the other structure is the same as that of the disk-type rotating electric machine according to the first embodiment shown in FIG. 1, the same reference numerals are given to the corresponding components and the description thereof is omitted.

Next, the stator cooling structure of Example 2 will be described with reference to FIGS. 5 is a longitudinal front view showing a stator to which the stator cooling structure of the second embodiment is applied, and FIG. 6 is a vertical side view showing the stator taken along line BB of FIG. 5 to which the stator cooling structure of the second embodiment is applied. is there.
The stator cooling structure according to the second embodiment is configured by providing the refrigerant passage 20 by embedding the refrigerant pipe 21 in the insulating member 13 in a part of the insulating member 13 arranged around the stator core 11. The same as in the first embodiment.

  As shown in FIG. 5, the stator core 11 is perpendicular to the rotating shaft 1 by laminating electromagnetic steel plates with gradually increasing circumferential width from the inside and laminating electromagnetic steel plates with the same circumferential width from the middle. The cross-sectional shape to be made is an inverted trapezoidal shape.

  As shown in FIGS. 5 and 6, the insulating member 13 is provided on the outer diameter side long side of the inverted trapezoidal cross-sectional shape of the stator core 11, and the cross-sectional shape orthogonal to the rotating shaft 1 is the stator core having the inverted trapezoidal cross-section. 11 is a semicircular shape set so that the coil 12 can be wound without bending at an acute angle.

  As shown in FIGS. 5 and 6, the refrigerant pipe 21 is embedded in the central portion of the insulating member 13 having a semicircular cross section so as to be embedded in the axial direction. Since other configurations are the same as those of the stator cooling structure of the first embodiment, description thereof is omitted.

  Next, the coil cooling operation in the second embodiment will be described. As in the first embodiment, the refrigerant supplied from the refrigerant inlet port 23 to the annular refrigerant supply jacket 25 is the refrigerant passage 20 → refrigerant return passage 29 → discharge. The refrigerant passage 27 → the refrigerant discharge jacket 26 → the refrigerant outlet port 24 is discharged to the outside.

  Here, in the first embodiment, the refrigerant moves in the inner direction by the refrigerant return passage 29, whereas in the second embodiment, the refrigerant moves in the outer direction by the refrigerant return passage 29. In addition, in the second embodiment, since the refrigerant pipe 21 is embedded in the insulating member 13 set at the outer diameter portion of the stator core 11, the stator cooling action focuses on the cooling on the outer periphery side of the stator that is likely to become high temperature. It will be what you put. Other functions are the same as those in the first embodiment.

  Next, the effects will be described. In the stator cooling structure for the disk-type rotating electrical machine of the second embodiment, the following effects can be obtained in addition to the effects (1) to (4) of the first embodiment.

  (6) The stator core 11 has an inverted trapezoidal cross-sectional shape perpendicular to the rotating shaft 1, and the insulating member 13 is provided on the outer long side of the inverted trapezoidal cross-sectional shape of the stator core 11. The refrigerant pipe 21 is embedded so as to penetrate the insulating member 13 in the axial direction, so that the coil 12 and the stator core 11 on the stator outer peripheral side are cooled by a high cooling effect. can do.

  Example 3 is an example in which a pipe having an irregular cross-sectional shape other than a circular shape is used as a refrigerant pipe, instead of a circular cross-sectional shape.

  That is, in the first example of the third embodiment, as shown in FIG. 7A, the stator core 11 has a T-shaped cross section perpendicular to the rotating shaft 1, and the insulating members 13, 13 When the coil 12 is wound around the stator core 11 having a letter cross section, the stator pipe 11 has a pair of right-angled cross-sectional shapes formed on the outer periphery of the core, and the refrigerant pipes 21 ′ and 21 ′ are perpendicular cross-sectional shapes of the insulating members 13 and 13. And is embedded and set so as to penetrate the insulating members 13 and 13 in the axial direction. In this case, the connecting portion is sealed with an adhesive or the like. Since other configurations are the same as those of the first embodiment, illustration and description thereof are omitted.

  Further, in the second example of Example 3, as shown in FIG. 7B, the stator core 11 has a T-shaped cross section perpendicular to the rotating shaft 1, and the insulating members 13, 13 When the coil 12 is smoothly wound around the stator core 11 having a letter-shaped cross section, it has a semicircular cross-sectional shape formed at the upper part of the outer periphery of the core, and the refrigerant pipe 21 ″ corresponds to the semicircular cross-sectional shape of the insulating member 13. It has an elliptical cross-sectional shape, and is embedded and set so as to penetrate in the axial direction with respect to the insulating member 13. In this case, the connecting portion is sealed with an adhesive or the like. Since it is the same as 2, illustration and description are omitted.

  Next, the stator cooling action of the third embodiment will be described. In the third embodiment, as apparent from the refrigerant pipe 21 ′ and the refrigerant pipe 21 ″, the modified cross-sectional shape corresponding to the cross-sectional shape of the insulating member 13 is set. Therefore, compared with Examples 1 and 2 using the refrigerant pipe 21 having a circular cross section, the heat removal area in contact with the insulating member 13 can be increased, and as a result, the heat removal efficiency can be increased. Since other operations are the same as those of the first and second embodiments, description thereof is omitted.

  Next, the effects will be described. In the stator cooling structure for the disk-type rotating electrical machine of the third embodiment, the following effects can be obtained in addition to the effects of the first and second embodiments.

  (7) The stator core 11 has a T-shaped cross-section perpendicular to the rotation axis 1, and the insulating member 13 is formed on the outer periphery of the core when the coil 12 is wound around the T-shaped stator core 11. The refrigerant pipes 21 ′ and 21 ″ have an irregular cross-sectional shape corresponding to the cross-sectional shape of the insulating member, and are embedded and set so as to penetrate the insulating member 13 in the axial direction. By increasing the heat removal area in contact with the insulating member 13, the heat removal efficiency by the refrigerant pipes 21 'and 21 "can be improved.

  Example 4 is an example in which the refrigerant passage is disposed outside the coil.

  That is, in the first example of the fourth embodiment, as shown in FIG. 8A, the stator core 11 has an inverted trapezoidal cross-sectional shape perpendicular to the rotating shaft 1, and the first insulating member 31 made of insulating paper or the like. The coil 12 is wound around the outer periphery of the coil 12, and a second insulating member 32 made of a resin mold or the like for insulating sealing is formed on the outer peripheral portion of the coil 12 to increase the radial thickness on the outer diameter side. Is embedded in the outer diameter position of the second insulating member 32 in the axial direction. Since other configurations are the same as those of the second embodiment, illustration and description thereof are omitted.

  Further, in the second example of the fourth embodiment, as shown in FIG. 8B, the stator core 11 has a reverse trapezoidal cross-sectional shape perpendicular to the rotating shaft 1, and the first insulating member 31 made of insulating paper or the like. The coil 12 is wound around the outer periphery of the coil 12, and a second insulating member 32 ′ made of a resin mold or the like for insulating sealing is formed on the outer peripheral portion of the coil 12 to increase the radial thickness on the inner diameter side. Is embedded in the inner diameter position of the second insulating member 32 'so as to penetrate in the axial direction. Since other configurations are the same as those of the first embodiment, illustration and description thereof are omitted.

  Next, the stator cooling operation of the fourth embodiment will be described. In the first example of the fourth embodiment shown in FIG. 8A, the refrigerant pipe 21 is set at the outer diameter position of the second insulating member 32, so that the stator is cooled. The outer peripheral side coil 12 can be cooled by a high cooling effect. In the second example of the fourth embodiment shown in FIG. 8B, the refrigerant pipe 21 is set at the inner diameter position of the second insulating member 32 ′, so that the coil 12 on the stator inner peripheral side is cooled with a high cooling effect. Can do. Other operations are the same as those in the first and second embodiments.

  Next, the effects will be described. In the stator cooling structure for the disk-type rotating electrical machine of the fourth embodiment, in addition to the effects of the first and second embodiments, the following effects can be obtained.

  (8) The coil 12 is wound around the stator core 11 via the first insulating member 31, and second insulating members 32 and 32 ′ are formed on the outer peripheral portion of the coil 12. Since the second insulating members 32 and 32 ′ are embedded and set in the axial direction, the coil portion adjacent to the refrigerant pipe 21 in the coil 12 wound around the stator core 11 can be cooled by a high cooling effect.

  As described above, the stator cooling structure of the disk-type rotating electrical machine according to the present invention has been described based on the first to fourth embodiments. However, the specific configuration is not limited to these embodiments, and the claims are not limited thereto. Modifications and additions of the design are permitted without departing from the spirit of the invention according to the claims.

  In the first to fourth embodiments, a preferable example in which the refrigerant passage provided in a part of the insulating member is formed by a refrigerant pipe made of a nonmagnetic material has been shown. However, an axial through hole is directly formed in a part of the insulating member, May be used as a refrigerant passage.

  In the first to fourth embodiments, an example in which one or two refrigerant passages are set for one stator tooth including a stator core and a coil has been shown. However, a plurality of three or more refrigerant passages are set for one stator tooth. Alternatively, a refrigerant path structure that regulates the refrigerant flow so as to reciprocate a plurality of refrigerant paths a plurality of times in the axial direction may be employed.

  In the first to fourth embodiments, an example of a disk-type rotating electrical machine in which the rotor and the stator are arranged in the axial direction via the air gap is shown. However, for example, an oil film exists in the axial gap between the rotor and the stator. Thus, the present invention can be applied to a disk-type rotating electrical machine that does not substantially include an air gap.

  In the first to fourth embodiments, the disk-type rotating electrical machine is described. However, it may be applied as a disk-type motor or a disk-type generator. In the first to fourth embodiments, an example of application of a 1 rotor / 2 stator to a disk-type rotating electrical machine has been shown. The present invention can also be applied to disk-type rotating electrical machines having different numbers of stators.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall cross-sectional view showing a disk-type rotating electrical machine having one rotor and two stators to which the stator cooling structure of Example 1 is applied. It is a vertical front view which shows the stator to which the stator cooling structure of Example 1 was applied. It is a vertical side view which shows the stator by the AA line of FIG. 2 to which the stator cooling structure of Example 1 was applied. It is a whole sectional view showing a disk type rotary electric machine by 1 rotor and 2 stator to which the stator cooling structure of Example 2 is applied. It is a vertical front view which shows the stator to which the stator cooling structure of Example 2 was applied. It is a vertical side view which shows the stator by the BB line of FIG. 5 with which the stator cooling structure of Example 2 was applied. It is the vertical front view which shows the stator of the 1st example to which the stator cooling structure of Example 3 was applied, and the vertical front view which shows the stator of the 2nd example. It is the vertical front view which shows the stator of the 1st example to which the stator cooling structure of Example 4 was applied, and the vertical front view which shows the stator of the 2nd example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Rotor 3 Stator 4 Rotating electrical machine case 4a Front side case 4b Rear side case 4c Outer case 4d First case 4e Second case 5 First bearing 6 Second bearing 8 Rotor base 9 Permanent magnet 10 Air gap 11 Stator core 12 Coil 13 Insulating member 20 Refrigerant passages 21, 21 ', 21 "Refrigerant pipe 22a Front end plate 22b Rear end plate 23 Refrigerant inlet port 24 Refrigerant outlet port 25 Refrigerant supply jacket 26 Refrigerant discharge jacket 27 Discharge refrigerant passage 28 Refrigerant communication member 29 Refrigerant return passage 31 First insulating member 32 Second insulating member

Claims (8)

In a disk-type rotating electrical machine comprising a rotor in which permanent magnets are arranged and a stator in which a plurality of stator cores are arranged on the circumference, wherein the rotor and the stator are arranged in the axial direction.
The stator includes a stator core, a coil, and an insulating member disposed around or around the stator core,
A stator cooling structure for a disk-type rotating electrical machine, wherein a refrigerant passage is provided in a part of the insulating member. In the stator cooling structure of the disk-type rotating electrical machine according to claim 1,
A stator cooling structure for a disk-type rotating electrical machine, wherein the refrigerant passage is provided by embedding a refrigerant pipe made of a nonmagnetic material in an insulating member. In the stator cooling structure for a disk-type rotating electrical machine according to claim 2,
The refrigerant pipe has both ends protruding from an insulating member and embedded in the insulating member, and both ends of the protruding refrigerant pipe are connected to a refrigerant supply path and a refrigerant discharge path formed in a case. Stator cooling structure for rotary electric machines. In the stator cooling structure of the disk-type rotating electrical machine according to claim 3,
A refrigerant supply jacket for supplying a refrigerant, a refrigerant discharge jacket for discharging the refrigerant, and an axial discharge refrigerant passage communicating with the refrigerant discharge jacket are formed in the case.
The refrigerant pipe has one end connected to a refrigerant supply jacket formed in the case, and the other end connected to a refrigerant communication member fixed to the case, of both ends of the protruding refrigerant pipe.
The refrigerant communication member communicates with a refrigerant passage formed in the refrigerant pipe, a discharge refrigerant passage and a refrigerant discharge jacket formed in the case, and changes a refrigerant flow direction to a radial direction at a position near the rotor. A stator cooling structure for a disk-type rotating electrical machine, comprising a refrigerant return passage. In the stator cooling structure for a disk-type rotating electrical machine according to any one of claims 2 to 4,
The stator core has a T-shaped cross section perpendicular to the rotation axis,
The insulating member has a pair of triangular shapes formed when a coil is wound around a stator core having a T-shaped cross section, the cross sectional shape being orthogonal to the rotation axis,
The stator cooling structure for a disk-type rotating electrical machine, wherein the refrigerant pipe is embedded in an axial direction with respect to each of a pair of triangular cross-section insulating members. In the stator cooling structure for a disk-type rotating electrical machine according to any one of claims 2 to 4,
The stator core has an inverted trapezoidal cross-sectional shape perpendicular to the rotation axis,
The insulating member is provided on the outer long side of the inverted trapezoidal cross-sectional shape of the stator core, the cross-sectional shape orthogonal to the rotation axis is a semicircular shape,
The stator cooling structure for a disk-type rotating electrical machine, wherein the refrigerant pipe is embedded in an axial direction with respect to the insulating member. In the stator cooling structure for a disk-type rotating electrical machine according to any one of claims 2 to 4,
The stator core has a T-shaped cross section perpendicular to the rotation axis,
The insulating member has a cross-sectional shape formed on the outer periphery of the core when the coil is wound around the T-shaped stator core,
The stator cooling structure for a disk-type rotating electrical machine, wherein the refrigerant pipe has an irregular cross-sectional shape corresponding to a cross-sectional shape of the insulating member, and is embedded in the axial direction with respect to the insulating member. In the stator cooling structure for a disk-type rotating electrical machine according to any one of claims 2 to 4,
A coil is wound around the stator core via a first insulating member,
A second insulating member is formed on the outer periphery of the coil;
The stator cooling structure for a disk-type rotating electrical machine, wherein the refrigerant pipe is embedded in the second insulating member so as to penetrate in the axial direction.

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