JP3815399B2 - Stator cooling structure for multi-axis multilayer motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a stator cooling structure of a multi-axis multilayer motor applied to a hybrid drive unit or the like.
[0002]
[Prior art]
Conventionally, as a stator cooling structure of a multi-axis multilayer motor, for example, a structure described in Japanese Patent Application Laid-Open No. 2000-14086 is known.
[0003]
The multi-axis multilayer motor described in the above-mentioned conventional publication employs a method of filling the stator assembly with a resin having good heat transfer efficiency as a method for fixing the stator, which is a heat source. Then, a passage is provided for passing a coolant through the resin in the vicinity of the stator, and cooling water is circulated through the passage, thereby cooling the resin and indirectly cooling the stator, thereby stabilizing the performance. Yes.
[0004]
[Problems to be solved by the invention]
However, in the conventional stator cooling structure of a multi-shaft multi-layer motor, the refrigerant distribution structure is divided into an inlet-side annular channel that communicates with the coolant inlet, an outlet-side annular channel that communicates with the coolant outlet, and an inlet side. A plurality of inlet-side annular passages communicating with the annular passage and each axial passage; a plurality of outlet-side annular passages communicating with the outlet-side annular passage and each axial passage; a coolant inlet; The U-turn flow path that communicates with the adjacent axial oil passage on the opposite side of the outlet, the length of the flow path from the coolant inlet to the coolant outlet is the distance between the coolant inlet and the coolant outlet. Each channel length is different, as the near channel length is short and the channel length far from the coolant inlet and outlet is longer, and the stator cooling is biased, and the stator cannot be uniformly cooled in the circumferential direction. was there.
[0005]
The present invention has been made paying attention to the above problems, and by making the lengths of all the distributed refrigerant paths substantially the same length, it is possible to alleviate the bias of stator cooling. It is an object to provide a stator cooling structure for a shaft multilayer motor.
[0006]
[Means for Solving the Problems]
  In order to solve the above problems, in the stator cooling structure of the present invention, the inner rotor and the outer rotor are arranged concentrically with the stator in between, and the stator is arranged at a constant pitch on the circumference centered on the motor rotation axis. In a multi-axis multilayer motor having a stator piece laminate around which the multiphase coil is wound, and a refrigerant path for cooling the coil heat generation of the stator piece laminate,
The refrigerant path,
A refrigerant introduction path for guiding the refrigerant from the outside to the refrigerant inlet at the end of the stator;
The shape is a donut shape, a partition wall for the forward path and the return path is provided in the circumferential direction, and a refrigerant distribution lid member that guides the refrigerant from the refrigerant introduction path to the start part of the forward path;
A refrigerant distribution plate member that opens an outward distribution hole that communicates with the forward portion and a return distribution hole that communicates with the backward portion at positions adjacent to each other in the circumferential direction;
Refrigerant outbound path formed through the resin mold portion of the stator in the axial direction, one end communicating with the outbound path distribution hole,
A refrigerant return path formed through the resin mold portion of the stator in the axial direction and having one end communicating with the return path distribution hole;
A refrigerant U-turn lid member communicating the other end of the refrigerant forward path and the refrigerant return path, which are set adjacent to each other in the circumferential direction;
A refrigerant discharge path that passes through the refrigerant return path and the return distribution hole of the refrigerant distribution plate member, and discharges the refrigerant from the end of the return path of the refrigerant distribution lid member;
With
In the refrigerant distribution lid member, both the forward path and the return path in the circumferential direction are annular, and a refrigerant inlet and a refrigerant outlet are provided adjacent to the annular forward path and the backward path, and the vicinity of the refrigerant inlet and the refrigerant outlet A radial partition wall that restricts the circulation of refrigerant to the annular forward path and the annular return path is provided nearWas configured
[0007]
  That is,Refrigerant introduction path → Refrigerant distribution lid member forward path → Refrigerant distribution plate member forward path distribution hole → Refrigerant forward path → Refrigerant U-turn lid member → Refrigerant return path → Refrigerant distribution plate member return path distribution hole → Refrigerant distribution cover member return path → A refrigerant path through which the refrigerant flows to the refrigerant discharge path, a set of the refrigerant forward path and the refrigerant return path are adjacent to each other in the circumferential direction, and a circumferential partition wall and a radial partition wall that partition the forward path and the return path are provided on the refrigerant distribution cover member. ThisIf the flow path length between the forward distribution hole and the refrigerant introduction path of the refrigerant distribution plate member is short, the flow path length between the return distribution hole and the refrigerant discharge path of the refrigerant distribution plate member becomes long, and conversely, the refrigerant distribution plate member Each flow according to the combination of the forward path and the return path is such that if the flow path length between the forward distribution hole and the refrigerant introduction path is longer, the flow path length between the return distribution hole of the refrigerant distribution plate member and the refrigerant discharge path becomes shorter. In the path, the total flow path length of the refrigerant for passing through the forward path and the return path of the refrigerant distribution lid member is set to be substantially the same length.
[0008]
【The invention's effect】
  Therefore, in the stator cooling structure of the present invention,In the refrigerant distribution lid member, both the forward path and the return path in the circumferential direction are annular, and the refrigerant introduction port and the refrigerant discharge port are provided adjacent to the annular forward path and the return path. In the vicinity, by providing a radial partition wall that restricts the circulation of the refrigerant to the annular forward path and the annular return path,The lengths of all the refrigerant paths from the refrigerant introduction path to the refrigerant discharge path are almost the same length, so the cooling effect of each refrigerant path is almost uniform and the stator cooling bias is alleviated. can do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment for realizing a stator cooling structure of a multi-axis multilayer motor according to the present invention will be described with reference to the drawings.
[0010]
(First embodiment)
First, the configuration will be described.
[0011]
[Overall configuration of hybrid drive unit]
FIG. 1 is an overall view of a hybrid drive unit to which the multi-shaft multilayer motor of the first embodiment is applied. In FIG. 1, E is an engine, M is a multi-shaft multi-layer motor, G is a Ravigneaux type planetary gear train, D Is a drive output mechanism, 1 is a motor cover, 2 is a motor case, 3 is a gear housing, and 4 is a front cover.
[0012]
The engine E is a main power source of the hybrid drive unit, and the engine output shaft 5 and the second ring gear R2 of the Ravigneaux type planetary gear train G are connected through a rotation fluctuation absorbing damper 6 and a multi-plate clutch 7. ing.
[0013]
The multi-axis multilayer motor M is a sub-power source having two motor generator functions although it is one motor in appearance. The multi-axis multilayer motor M is fixed to the motor case 2 and includes a stator S as a fixed armature wound with a coil, an inner rotor IR disposed inside the stator S and having a permanent magnet embedded therein, and the stator The outer rotor OR, which is arranged outside the S and has a permanent magnet embedded therein, is arranged in three layers on the same axis. The first motor hollow shaft 8 fixed to the inner rotor IR is connected to the first sun gear S1 of the Ravigneaux type compound planetary gear train G, and the second motor shaft 9 fixed to the outer rotor OR is the Ravigneaux type compound planetary gear. It is connected to the second sun gear S2 of row G.
[0014]
The Ravigneaux-type compound planetary gear train G is a planetary gear mechanism having a continuously variable transmission function that changes the gear ratio steplessly by controlling two motor rotation speeds. The Ravigneaux type planetary gear train G includes a common carrier C that supports the first pinion P1 and the second pinion P2 that mesh with each other, a first sun gear S1 that meshes with the first pinion P1, and a second sun gear that meshes with the second pinion P2. It has five rotating elements, S2, a first ring gear R1 that meshes with the first pinion P1, and a second ring gear R2 that meshes with the second pinion P2. A multi-plate brake 10 is interposed between the first ring gear R1 and the gear housing 3. An output gear 11 is connected to the common carrier C.
[0015]
The drive output mechanism D includes an output gear 11, a first counter gear 12, a second counter gear 13, a drive gear 14, a differential 15, and drive shafts 16L and 16R. The output rotation and output torque from the output gear 11 pass through the first counter gear 12 → second counter gear 13 → drive gear 14 → differential 15 and are transmitted from the drive shafts 16L and 16R to the drive wheels (not shown). The
[0016]
That is, the hybrid drive unit connects the second ring gear R2 and the engine output shaft 5, connects the first sun gear S1 and the first motor hollow shaft 8, and connects the second sun gear S2 and the second motor shaft 9. And the output gear 11 is connected to the common carrier C.
[0017]
[Configuration of multi-axis multilayer motor]
FIG. 2 is a longitudinal side view showing a multi-axis multilayer motor M to which the stator cooling structure of the first embodiment is applied, and FIG. 3 is a partial view showing the multi-axis multilayer motor M to which the stator cooling structure of the first embodiment is applied. FIG. 4 is a front view of the stator according to the first embodiment viewed from the back side.
[0018]
In FIG. 2, reference numeral 1 denotes a motor cover, and 2 a motor case. A multi-axis multilayer motor M constituted by an inner rotor IR, a stator S, and an outer rotor OR is disposed in a motor chamber 17 surrounded by them. Yes.
[0019]
The inner rotor surface of the inner rotor IR is fixed by press-fitting (or shrink fitting) to the stepped shaft end portion of the first motor hollow shaft 8. As shown in FIG. 3, twelve inner rotor magnets 21 (permanent magnets) are embedded in the inner rotor IR in the axial direction with respect to the rotor base 20 in consideration of magnetic flux formation. However, two pairs are V-shaped and have the same polarity to form a three-pole pair.
[0020]
The stator S includes a stator piece laminate 41 in which the stator pieces 40 are laminated, a coil 42, a cooling passage 43 for cooling the stator, an inner side bolt / nut 44, an outer side bolt / nut 45, and a resin mold portion 46. Configured. The front side end of the stator S is fixed to the motor case 2 via the front side end plate 47 and the stator shaft 48.
[0021]
The coil 42 has 18 coils, and as shown in FIG. 4, the coil 42 is arranged on the circumference while repeating the 6-phase coil three times.
[0022]
A composite current is applied to the six-phase coil 42 from an inverter (not shown) through the power supply connection terminal 50, the bus bar radial stack 51, the power connector 52, and the bus bar axial stack 53 (see FIG. 18). This composite current is a combination of a three-phase alternating current for driving the outer rotor OR and a six-phase alternating current for driving the inner rotor IR.
[0023]
The outer rotor OR has an outer cylindrical surface fixed to the outer rotor case 62 by brazing or bonding. And the front side connection case 63 is being fixed to the front side of the outer rotor case 62, and the back side connection case 64 is being fixed to the back side. The second motor shaft 9 is splined to the back side connection case 64. In the outer rotor OR, as shown in FIG. 3, twelve outer rotor magnets 61 (permanent magnets) arranged in consideration of magnetic flux formation with respect to the rotor base 60 are embedded in the axial direction at both end positions. ing. Unlike the inner rotor magnet 21, the outer rotor magnet 61 is different in polarity one by one and forms a six-pole pair.
[0024]
In FIG. 2, reference numerals 80 and 81 denote a pair of outer rotor support bearings that support the outer rotor 6 to the motor case 2 and the motor cover 1. 82 is an inner rotor support bearing that supports the inner rotor IR to the motor case 2, 83 is a stator support bearing that supports the stator S with respect to the outer rotor OR, and 84 is between the first motor hollow shaft 8 and the second motor shaft 9. This is an intermediate bearing.
[0025]
In FIG. 2, 85 is an inner rotor resolver that detects the rotational position of the inner rotor IR, and 86 is an outer rotor resolver that detects the rotational position of the outer rotor OR.
[0026]
[Configuration of planetary gear mechanism]
FIG. 5 is a longitudinal sectional view showing a Ravigneaux type compound planetary gear train G of the hybrid drive unit. In FIG. 5, 2 is a motor case, 3 is a gear housing, and 4 is a front cover. A Ravigneaux type planetary gear train G and a drive output mechanism D are arranged in a gear chamber 30 surrounded by them.
[0027]
The second ring gear R2 of the Ravigneaux type planetary gear train G is driven to rotate from the engine E when the multi-plate clutch 7 is engaged via the rotation fluctuation absorbing flywheel damper 6, the transmission input shaft 31, and the clutch drum 32. Torque is input.
[0028]
A first motor hollow shaft 8 is splined to the first sun gear S1 of the Ravigneaux type planetary gear train G, and the first torque and the first torque are transmitted from the inner rotor IR of the multi-axis multilayer motor M according to the determined motor operating point. The first rotation speed is input.
[0029]
A second motor shaft 9 is splined to the second sun gear S2 of the Ravigneaux type planetary gear train G, and the second torque and the second torque are output from the outer rotor OR of the multi-axis multilayer motor M according to the determined motor operating point. Two revolutions are input.
[0030]
A multi-plate brake 10 is provided between the first ring gear R1 of the Ravigneaux type planetary gear train G and the gear housing 3, and when the multi-plate brake 10 is engaged at the time of starting or the like, the first ring gear R1 is Stop.
[0031]
An output gear 11 that is rotatably supported by a stator shaft 48 via a bearing is splined to the common carrier C of the Ravigneaux type planetary gear train G.
[0032]
The drive output mechanism D includes a first counter gear 12 that meshes with the output gear 11, a second counter gear 13 provided on the shaft portion of the first counter gear 12, and a drive gear 14 that meshes with the second counter gear 13. And have. The final reduction ratio is determined by the ratio of the number of teeth of the second counter gear 13 and the drive gear 14.
[0033]
A fastening pressure is supplied to the clutch piston 33 of the multi-plate clutch 7 by a clutch pressure oil passage 34 formed in the front cover 4. A fastening pressure is supplied to the brake piston 35 of the multi-plate brake 10 by a brake pressure oil passage 36 formed in the front cover 4. The clutch piston 33 and the brake piston 35 are disposed inside the front cover 4, the clutch piston 33 is disposed at an inner circumferential position, and the brake piston 35 is disposed at an outer circumferential position thereof.
[0034]
A shaft center oil passage 37 is formed in the transmission input shaft 31, and lubricating oil is supplied to the shaft center oil passage 37 through a lubricant oil passage 38 formed in the front cover 4. The
[0035]
[Stator structure]
FIG. 6 is an enlarged longitudinal sectional view showing the stator S and the motor case member of the multi-axis multilayer motor of the first embodiment.
[0036]
The stator piece laminate 41 is configured by laminating a plurality of stator pieces 40 in the axial direction and winding a coil 42 of a flat copper wire around the outer periphery thereof so as to reciprocate in the axial direction.
[0037]
The front-side bracket 70 and the back-side bracket 71 have a plurality of stator piece laminates 41 around which the coils 42 are wound arranged at equal intervals on the circumference centered on the motor rotation axis, and at both axial end positions. The stator piece 40 is positioned while being positioned.
[0038]
The front side end plate 47 and the back side end plate 49 are arranged outside the brackets 70 and 71. A stator shaft 48 is fixed to the front end plate 47.
[0039]
The inner side bolt / nut 44 and the outer side bolt / nut 45 are inserted through both end plates 47 and 49, tightened by rotating the nut, and fixed as a whole by the frictional force generated by this tightening. Constructs a skeletal structure.
[0040]
The stator cooling pipe 72 is disposed at a position between the coiled stator piece laminated bodies 41 adjacent in the circumferential direction, and both ends thereof are supported by the front bracket 70 and the rear bracket 71.
[0041]
The resin mold portion 46 is formed by placing a skeletal structure supporting the stator cooling pipe 32 in a mold having a concave shape that matches the stator shape, pouring the molten resin, and filling the space with the molten resin. The In addition, 74 is a refrigerant introduction path formed in the motor case 2, 74 ′ is a refrigerant discharge path formed in the motor case 2, and 77 is a bolt that fixes the stator S to the motor case 2.
[0042]
[Stator cooling structure]
7 is a cross-sectional view showing the stator cooling structure and refrigerant flow of the first embodiment, FIG. 8 is a cross-sectional view showing the refrigerant distribution lid member of the stator cooling structure of the first embodiment along the line AA of FIG. 7, and FIG. 7B and 7B are views showing the refrigerant distribution plate member of the stator cooling structure of the first embodiment according to the line 7B-B, and FIG. FIG. 11 is a view showing the refrigerant U-turn lid member of the stator cooling structure according to the first embodiment taken along line 7D-D in FIG.
[0043]
In the multi-axis multilayer motor M, an inner rotor IR and an outer rotor OR are disposed concentrically with a stator S interposed therebetween, and an inner rotor and an outer rotor are disposed concentrically with the stator interposed therebetween.
[0044]
The stator S includes a stator piece laminate 41 in which coils 42 (multiphase coils) arranged at an equal pitch around a circumference around a motor rotation axis are wound, and a stator that cools the coil heat generation of the stator piece laminate 41 And a cooling refrigerant path 43.
[0045]
The refrigerant path 43 includes a refrigerant introduction path 90, a refrigerant distribution lid member 91, a refrigerant distribution plate member 92, a refrigerant forward path 93, a refrigerant return path 94, a refrigerant U-turn lid member 95, a refrigerant discharge path 96, It is set as the structure provided with.
[0046]
The refrigerant introduction path 90 is formed in the resin mold portion 46 as shown in FIG. 7 (a), and guides the refrigerant from the outside to the refrigerant introduction port at the stator end.
[0047]
As shown in FIG. 8, the refrigerant distribution lid member 91 has a donut shape, is provided with a partition wall 91c of an outward path 91a and a return path 91b in the circumferential direction, and extends from the refrigerant introduction path 90 to the start portion 91d of the outward path 91a. Guide the refrigerant.
[0048]
As shown in FIG. 9, the refrigerant distribution plate member 92 includes a forward distribution hole 92a communicating with the forward path 91a and a return distribution hole 92b communicating with the backward path 91b in the circumferential direction. Open to the position to be.
[0049]
As shown in FIG. 10, the refrigerant forward path 93 is formed through the resin mold portion 46 of the stator S in the axial direction, and one end communicates with the forward path distribution hole 92a.
[0050]
As shown in FIG. 10, the refrigerant return path 94 is formed through the resin mold portion 46 of the stator S in the axial direction, and one end thereof communicates with the return path distribution hole 92b.
[0051]
As shown in FIG. 11, the refrigerant U-turn lid member 95 is formed with a communication recess 95a corresponding to a pair of refrigerant outward paths 93 and a refrigerant return path 94, and is set adjacent to the circumferential direction in the refrigerant forward path 93 and the refrigerant return path. The other end of 94 is communicated.
[0052]
As shown in FIG. 7 (b), the refrigerant discharge path 96 passes through the refrigerant return path 94 and the return distribution hole 92 b of the refrigerant distribution plate member 92, and from the end portion 91 e of the return path 91 b of the refrigerant distribution lid member 91. Discharge the refrigerant.
[0053]
As shown in FIG. 10, the refrigerant forward path 93 and the refrigerant return path 94 are disposed between the coils 42 adjacent in the circumferential direction. Note that the numbers of circles in the reciprocating refrigerant paths are the same, the numbers without "'" correspond to the refrigerant forward path 93, and the numbers with "'" are the refrigerant return path 94. It corresponds to.
[0054]
The partition wall 91c of the refrigerant distribution lid member 91 maintains a circumferential cross-sectional area in a constant direction from a portion close to the refrigerant introduction passage 90 to a portion far from the refrigerant introduction passage 90, and a circumferential return cross-sectional area as a refrigerant discharge passage 96. It is an annular partition wall that maintains a constant cross-sectional area from near to far.
[0055]
Next, the operation will be described.
[0056]
[Basic functions of multi-axis multilayer motor]
By adopting a multi-shaft multilayer motor M in which two magnetic lines of outer rotor magnetic field lines and inner rotor magnetic field lines are formed with two rotors and one stator, the coil 42 and a coil inverter (not shown) are replaced with two inner rotors IR and outer rotors. Can be shared for OR. Then, by applying a composite current obtained by superimposing the current for the inner rotor IR and the current for the outer rotor OR to one coil 42, the two rotors IR and OR can be controlled independently. That is, in terms of appearance, one multi-axis multilayer motor M can be used as a combination of different or similar functions of the motor function and the generator function.
[0057]
Therefore, for example, compared to the case where a motor having a rotor and a stator and a generator having a rotor and a stator are provided, the size is greatly reduced. Thus, loss due to current (copper loss, switching loss) can be prevented.
[0058]
Moreover, it has a high degree of freedom in selection, such as using not only (motor + generator) but also (motor + motor) or (generator + generator) only by composite current control. When employed as a drive source for a hybrid vehicle as in the embodiment, the most effective or efficient combination can be selected from these many options according to the vehicle state.
[0059]
[Stator cooling]
When a large current is passed through the coil 42 when the multi-axis multilayer motor M is driven, the coil 42 generates heat. This heat causes the electrical efficiency and mechanical efficiency to deteriorate. Further, in the multi-axis multilayer motor M, the coils 42 that are heating elements are arranged in the stator S at equal pitches on the circumference around the motor rotation axis. Therefore, in order to remove the heat, it is necessary to cool without deviation in the circumferential direction of the stator S.
[0060]
The stator cooling action by the stator cooling structure of the first embodiment will be described with reference to FIGS.
[0061]
The refrigerant that has passed through the refrigerant introduction path 74 formed in the motor case 2 from the outside is, as shown in FIG. 7 (a), the refrigerant introduction path 90 → the forward path 91a of the refrigerant distribution lid member 91 → the refrigerant distribution plate member in the forward path. The forward flow distribution hole 92a → the refrigerant forward passage 93 → the refrigerant U-turn cover member 95 flows into the communication recess 95a.
[0062]
In the return path, as shown in FIG. 7B, the return path 94 → the return distribution hole 92 b of the refrigerant distribution plate member 92 → the return path of the refrigerant distribution cover member 91 from the communication recess 95 a of the refrigerant U-turn cover member 95. The refrigerant flows from 91 b to the refrigerant discharge path 96, passes through the refrigerant discharge path 74 ′ formed in the motor case 2 from the refrigerant discharge path 96, and is discharged to the outside.
[0063]
In this refrigerant flow, a set of the refrigerant forward path 93 and the refrigerant backward path 94 is adjacent in the circumferential direction, and the refrigerant distribution lid member 91 is provided with a circumferential partition wall 91c that partitions the forward path 91a and the backward path 91b.
[0064]
For this reason, for example, in FIG. 12, if the flow path length between the forward distribution hole 92a of the refrigerant distribution plate member 92 and the refrigerant introduction path 90 is short as in the combination of the forward path (1) and the backward path (1) ', The flow path length between the return distribution hole 92b and the refrigerant discharge path 96 of the refrigerant distribution plate member 92 becomes longer, and conversely, as in the combination of the forward path <9> and the return path <9> ', If the flow path length between the forward distribution hole 92a and the refrigerant introduction path 90 is long, the flow path length between the return distribution hole 92b of the refrigerant distribution plate member 92 and the refrigerant discharge path 96 becomes short.
[0065]
Thus, since the total flow path length of the refrigerant for passing through the forward path 91a and the return path 91b of the refrigerant distribution lid member 91 is substantially the same length (less than one round of the refrigerant distribution lid member 91), Refrigerant paths 43 (from the refrigerant introduction path 90 to the refrigerant discharge path) represented by the combinations of {circle around (1)}, {circle around (1)} to {9}, {9} 'including the reciprocating path and the U-turn path 96) is substantially the same length, the cooling effect of each refrigerant passage 43 becomes substantially uniform, and the cooling bias of the stator S can be alleviated.
[0066]
The flow path resistance can be adjusted and the flow rate of each refrigerant path 43 can be made uniform by changing the size of the forward distribution hole 92a and the return distribution hole 92b of the refrigerant distribution plate member 92.
[0067]
Further, as shown in FIG. 6, since the refrigerant U-turn lid member 95 is pushed outward in the axial direction by the refrigerant flowing inside the refrigerant U-turn lid member 95, this force acts on the stator support bearing 83. That is, the preload can be applied to the stator support bearing 83 by the refrigerant.
[0068]
Next, the effect will be described.
In the stator cooling structure of the multi-axis multilayer motor of the first embodiment, the effects listed below can be obtained.
[0069]
(1) An inner rotor IR and an outer rotor OR are arranged concentrically with the stator S in between, and the stator S is a stator piece in which coils 42 arranged at equal pitch around the circumference of the motor rotation shaft are wound. In the multi-axis multilayer motor M having the laminate 41 and the stator cooling refrigerant passage 43 for cooling the coil heat generation of the stator piece laminate 41, the refrigerant introduction passage 90 → the forward passage 91a of the refrigerant distribution cover member 91 → refrigerant. Outward distribution hole 92a of distribution plate member 92 → Refrigerant forward path 93 → Communication recess 95a of refrigerant U-turn lid member 95 → Return refrigerant return path 94 → Return distribution hole 92b of refrigerant distribution plate member 92 → Return path 91b of refrigerant distribution cover member 91 → A refrigerant path 43 through which the refrigerant flows to the refrigerant discharge path 96, a set of the refrigerant forward path 93 and the refrigerant return path 94 is adjacent in the circumferential direction, and the forward path 91 is connected to the refrigerant distribution lid member 91. If due to the provision of the circumferential direction of the partition wall 91c that partitions the return 91b, the path length of all the refrigerant passages 43 distributed is almost same length of the path length, can be alleviated bias the stator cooling.
[0070]
(2) Since the refrigerant forward path 93 and the refrigerant return path 94 are disposed between the coils 42 adjacent in the circumferential direction, the coil 42 that is a heat generation source, the refrigerant forward path 93, and the refrigerant return path 94 are disposed closest to each other, and high efficiency is achieved. Can be cooled.
[0071]
(3) The partition wall 91c of the refrigerant distribution lid member 91 keeps the circumferential cross-sectional area in a constant direction from a portion close to the refrigerant introduction passage 90 to a portion far from the refrigerant introduction passage 90, and the circumferential cross-section of the return passage is a refrigerant discharge passage. Since the annular partition wall is maintained at a constant cross-sectional area from a portion close to 96 to a portion far from it, the flow path resistance of the refrigerant flowing through the forward path 91a and the return path 91b of the refrigerant distribution lid member 91 is constant by the partition wall 91c provided on the circumference. Can be kept in.
[0072]
(Second embodiment)
In the second embodiment, the partition wall of the refrigerant distribution lid member is a stepwise spiral partition wall.
[0073]
The stator cooling structure will be described.
FIG. 13 is a cross-sectional view showing the stator cooling structure and refrigerant flow of the second embodiment, FIG. 14 is a cross-sectional view showing the refrigerant distribution lid member of the stator cooling structure of the second embodiment along the line E-E in FIG. FIG. 13F is a diagram showing a refrigerant distribution plate member of the stator cooling structure of the second embodiment along the line F. FIG. 16 is a cross-sectional view showing a refrigerant forward path and a refrigerant return path of the stator cooling structure of the second embodiment according to the lines 13G-G. FIG. 17 is a view showing the refrigerant U-turn lid member of the stator cooling structure of the second embodiment along the line H-H in FIG. 13.
[0074]
As shown in FIG. 16, the stator S of the multi-axis multilayer motor M includes a stator piece laminate 41 in which coils 42 (multi-phase coils) arranged at an equal pitch are wound around a circumference around a motor rotation axis, A stator cooling refrigerant path for cooling the coil heat generation of the stator piece laminate 41.
[0075]
The refrigerant path includes a refrigerant introduction path 100, a refrigerant distribution lid member 101, a refrigerant distribution plate member 102, a refrigerant forward path 103, a refrigerant return path 104, a refrigerant U-turn lid member 105, and a refrigerant discharge path 106. It has a configuration with.
[0076]
As shown in FIG. 13, the refrigerant introduction path 100 is formed in the resin mold portion 46 and guides the refrigerant from the outside to the refrigerant introduction port at the end of the stator.
[0077]
As shown in FIG. 14, the refrigerant distribution lid member 101 has a donut shape, is provided with a partition wall 101c of the forward path 101a and the return path 101b in the circumferential direction, and extends from the refrigerant introduction path 100 to the start portion 101d of the forward path 101a. Guide the refrigerant.
[0078]
As shown in FIG. 15, the refrigerant distribution plate member 102 has an outward distribution hole 102a communicating with the forward path 101a and a return distribution hole 102b communicating with the backward path 101b adjacent to each other in the circumferential direction. Open to the position to be. Each distribution hole 102a, 102b is defined by a radial partition wall 102c.
[0079]
As shown in FIG. 16, the refrigerant forward path 103 is formed to penetrate the resin mold portion 46 of the stator S in the axial direction, and one end thereof communicates with the forward distribution hole 102a.
[0080]
As shown in FIG. 16, the refrigerant return path 104 is formed through the resin mold portion 46 of the stator S in the axial direction, and one end communicates with the return path distribution hole 102b.
[0081]
As shown in FIG. 17, the refrigerant U-turn lid member 105 is formed with a communication recess 105a corresponding to the pair of refrigerant outward paths 103 and the refrigerant return path 104, and is set adjacent to the circumferential direction in the refrigerant outward path 103 and the refrigerant return path. The other end of 104 is communicated.
[0082]
As shown in FIG. 13, the refrigerant discharge path 106 passes through the refrigerant return path 104 and the return distribution hole 102b of the refrigerant distribution plate member 102, and discharges the refrigerant from the end portion 101e of the return path 101b of the refrigerant distribution lid member 101. To do.
[0083]
As shown in FIG. 16, the refrigerant forward path 103 and the refrigerant return path 104 are arranged between the coils 42 adjacent in the circumferential direction. In FIG. 14, the numbers of circles in the refrigerant paths that are reciprocal are the same, the numbers without “′” correspond to the refrigerant forward path 103, and the numbers with “′” Corresponds to the refrigerant return path 104.
[0084]
The partition wall 101c of the refrigerant distribution lid member 101 has the largest outward cross-sectional area near the refrigerant introduction path 100, and the outward cross-sectional area gradually decreases in the circumferential direction toward the refrigerant discharge path 106. A step-like spiral partition wall that is set and has the return cross-sectional area near the refrigerant introduction path 100 set to be the narrowest, and the forward cross-sectional area is gradually increased toward the refrigerant discharge path 106 in the circumferential direction (1 to 9 walls). Since other configurations are the same as those of the first embodiment, illustration and description thereof are omitted.
[0085]
Next, the stator cooling operation will be described.
[0086]
When a large current is passed through the coil 42 when the multi-axis multilayer motor M is driven, the coil 42 generates heat. This heat causes the electrical efficiency and mechanical efficiency to deteriorate. Further, in the multi-axis multilayer motor M, the coils 42 that are heating elements are arranged in the stator S at equal pitches on the circumference around the motor rotation axis. Therefore, in order to remove the heat, it is necessary to cool without deviation in the circumferential direction of the stator S.
[0087]
The stator cooling action by the stator cooling structure of the second embodiment will be described with reference to FIG.
[0088]
The refrigerant that has passed through the refrigerant introduction path 74 formed in the motor case 2 from the outside is, as shown on the right side of FIG. 13, the refrigerant introduction path 100 → the forward path 101 a of the refrigerant distribution lid member 101 → the refrigerant distribution plate member 102. The forward flow distribution hole 102a → the refrigerant forward passage 103 → the refrigerant U-turn cover member 105 flows into the communication recess 105a.
[0089]
In the return path, as shown on the left side of FIG. 13, from the communication recess 105 a of the refrigerant U-turn lid member 105, the return path 104 b of the refrigerant return plate 104 → the return distribution hole 102 b of the refrigerant distribution plate member 102 → the return path 101 b of the refrigerant distribution lid member 101. → The refrigerant flows to the refrigerant discharge path 106, passes through the refrigerant discharge path 74 ′ formed in the motor case 2 from the refrigerant discharge path 106, and is discharged to the outside.
[0090]
In this refrigerant flow, a set of the refrigerant forward path 103 and the refrigerant backward path 104 is adjacent in the circumferential direction, and the refrigerant distribution lid member 101 is provided with a circumferential partition wall 101c that partitions the forward path 101a and the backward path 101b.
[0091]
For this reason, for example, in FIG. 14, if the flow path length between the forward distribution hole 102a of the refrigerant distribution plate member 102 and the refrigerant introduction path 100 is short, as in the combination of the forward path (1) and the return path (1) ', The flow path length between the return distribution hole 102b of the refrigerant distribution plate member 102 and the refrigerant discharge path 106 becomes longer, and conversely, as in the combination of the return path 9 and the return path 9), If the flow path length between the forward distribution hole 102a and the refrigerant introduction path 100 is long, the flow path length between the return distribution hole 102b of the refrigerant distribution plate member 102 and the refrigerant discharge path 106 becomes short.
[0092]
In this way, the total flow path length of the refrigerant for passing through the forward path 101a and the return path 101b of the refrigerant distribution lid member 101 becomes substantially the same length (less than one round of the refrigerant distribution lid member 101). Refrigerant paths (from the refrigerant introduction path 100 to the refrigerant discharge path 106) represented by the combinations of distributed {circle around (1)}, {circle around (1)} to {9}, {9} 'including the reciprocating path and the U-turn path. The cooling length of each refrigerant path is substantially uniform, and the cooling bias of the stator S can be alleviated. Since other operations are the same as those of the first embodiment, description thereof is omitted.
[0093]
Next, the effect will be described.
In the stator cooling structure of the multi-axis multilayer motor of the second embodiment, the following effects can be obtained in addition to the effects (1) and (2) of the first embodiment.
[0094]
(4) The partition wall 101c of the refrigerant distribution lid member 101 sets the widest cross-sectional area of the part close to the refrigerant introduction path 100, and gradually increases the cross-sectional area of the forward path toward the refrigerant discharge path 106 in the circumferential direction. A step spiral shape in which the return cross-sectional area of the portion close to the refrigerant introduction path 100 is set to be the narrowest, and the forward cross-sectional area is gradually increased toward the refrigerant discharge path 106 in the circumferential direction. Since the partition wall is used, the flow rate of the refrigerant can be made uniform by a stepwise change in the refrigerant channel cross-sectional area.
[0095]
As mentioned above, although the stator cooling structure of the multi-axis multilayer motor of this invention has been demonstrated based on 1st Example and 2nd Example, about a specific structure, it is not restricted to these Examples, Claim Modifications and additions of the design are permitted without departing from the spirit of the invention according to each claim in the scope of the above.
[0096]
For example, in the first embodiment, an example of a multi-axis multi-layer motor applied to a hybrid drive unit has been shown. However, for a multi-axis multi-layer motor installed alone or a multi-axis multi-layer motor applied to another system Also, the stator cooling structure of the present invention can be adopted.
[Brief description of the drawings]
FIG. 1 is a schematic overall view showing a hybrid drive unit to which a multi-axis multilayer motor having a stator cooling structure of a first embodiment is applied.
FIG. 2 is a longitudinal side view showing a multi-axis multilayer motor M to which the stator cooling structure of the first embodiment is applied.
FIG. 3 is a partially longitudinal front view showing a multi-axis multilayer motor M to which the stator cooling structure of the first embodiment is applied.
FIG. 4 is a view of a multi-axis multilayer motor M to which the stator cooling structure of the first embodiment is applied as viewed from the back side of the stator.
FIG. 5 is a longitudinal side view showing a Ravigneaux type planetary gear train G and a drive output mechanism D of a hybrid drive unit to which the multi-axis multilayer motor of the first embodiment is applied.
FIG. 6 is a longitudinal side view showing a stator and a motor case member of a multi-axis multilayer motor M to which the stator cooling structure of the first embodiment is applied.
FIG. 7 is a cross-sectional view showing the stator cooling structure of the first embodiment and the flow of refrigerant.
FIG. 8 is a cross-sectional view showing a refrigerant distribution lid member of the stator cooling structure of the first embodiment taken along line AA in FIG. 7;
FIG. 9 is a view showing a refrigerant distribution plate member of the stator cooling structure of the first embodiment taken along line B-B in FIG. 7;
FIG. 10 is a cross-sectional view showing a refrigerant forward path and a refrigerant return path of the stator cooling structure of the first embodiment according to the FIG. 7C-C line.
FIG. 11 is a diagram showing a refrigerant U-turn lid member of the stator cooling structure of the first embodiment, taken along line 7D-D.
FIG. 12 is an operation explanatory view showing a refrigerant flow in the refrigerant distribution lid member of the stator cooling structure of the first embodiment.
FIG. 13 is a cross-sectional view showing a stator cooling structure and a refrigerant flow of a second embodiment.
14 is a cross-sectional view showing a refrigerant distribution lid member of the stator cooling structure of the second embodiment, taken along line 13E-E. FIG.
FIG. 15 is a view showing a refrigerant distribution plate member of the stator cooling structure of the second embodiment taken along line F in FIG. 13;
FIG. 16 is a cross-sectional view showing a refrigerant forward path and a refrigerant return path of the stator cooling structure of the second embodiment, taken along line G-G in FIG.
FIG. 17 is a view showing a refrigerant U-turn lid member of the stator cooling structure of the second embodiment along the line H-H in FIG. 13;
FIG. 18 is an explanatory diagram showing an example of a composite current applied to a stator coil of a multi-axis multilayer motor.
[Explanation of symbols]
M Double-axis multilayer motor
S stator
IR inner rotor
OR outer rotor
41 Stator piece laminate
42 coils (multi-phase coils)
43 Refrigerant path
46 Resin mold part
90 Refrigerant introduction path
91 Refrigerant distribution lid member
91a Outbound
91b Return
91c partition wall
91d Starter
91e termination
92 Refrigerant distribution plate member
92a Outbound distribution hole
92b Return hole distribution hole
93 Refrigerant outbound
94 Refrigerant return path
95 Refrigerant U-turn lid member
95a Communication recess
96 Refrigerant discharge passage
100 Refrigerant introduction path
101 Refrigerant distribution lid member
101a Outbound
101b Return
101c partition wall
101d starting part
101e termination
102 Refrigerant distribution plate member
102a Outbound distribution hole
102b Distribution hole for return path
103 Refrigerant outbound path
104 Refrigerant return path
105 Refrigerant U-turn lid member
105a Communication recess
106 Refrigerant discharge path

Claims (4)

An inner rotor and an outer rotor are arranged concentrically around the stator,
The stator includes a stator piece laminate in which multiphase coils arranged at an equal pitch around a circumference around a motor rotation shaft are wound, and a refrigerant shaft that cools the coil heat generation of the stator piece laminate. In multi-layer motors,
The refrigerant path,
A refrigerant introduction path for guiding the refrigerant from the outside to the refrigerant inlet at the end of the stator;
The shape is a donut shape, a partition wall for the forward path and the return path is provided in the circumferential direction, and a refrigerant distribution lid member that guides the refrigerant from the refrigerant introduction path to the start portion of the forward path;
A refrigerant distribution plate member that opens a forward distribution hole that communicates with the forward path portion and a return distribution hole that communicates with the backward path portion at positions adjacent to each other in the circumferential direction;
Refrigerant forward path formed through the resin mold portion of the stator in the axial direction, one end communicating with the forward distribution hole,
A refrigerant return path formed through the resin mold portion of the stator in the axial direction and having one end communicating with the return path distribution hole;
A refrigerant U-turn lid member communicating the other end of the refrigerant forward path and the refrigerant return path, which are set adjacent to each other in the circumferential direction;
A refrigerant discharge path that passes through the refrigerant return path and the return distribution hole of the refrigerant distribution plate member, and discharges the refrigerant from the terminal end of the return path of the refrigerant distribution lid member;
Equipped with a,
In the refrigerant distribution lid member, both the forward and backward paths in the circumferential direction are annular, and the refrigerant inlet and the refrigerant outlet are provided adjacent to the annular forward and backward paths, and the vicinity of the refrigerant inlet and the refrigerant outlet A stator cooling structure for a multi-shaft multi-layer motor, characterized in that a radial partition wall is provided in the vicinity of to prevent the refrigerant from circulating to the annular forward path and the annular return path . In the stator cooling structure of the multi-axis multilayer motor according to claim 1,
A stator cooling structure for a multi-shaft multilayer motor, wherein the refrigerant forward path and the refrigerant return path are disposed between coils adjacent in the circumferential direction. In the stator cooling structure of a multi-axis multilayer motor according to any one of claims 1 and 2,
The partition wall of the refrigerant distribution lid member maintains a constant cross-sectional area in the circumferential direction from a portion close to the refrigerant introduction path to a portion far from the refrigerant introduction path, and a circumferential cross-sectional area in the return direction far from the portion near the refrigerant introduction path. A stator cooling structure for a multi-axis multi-layer motor, characterized in that it is an annular partition wall that maintains a constant cross-sectional area up to a portion. In the stator cooling structure of a multi-axis multilayer motor according to any one of claims 1 and 2,
The partition wall of the refrigerant distribution lid member has the widest cross-sectional area of the part close to the refrigerant introduction path, and the outward cross-sectional area is set to be narrowed stepwise or steplessly toward the refrigerant discharge path side in the circumferential direction. In addition, the return cross-sectional area of the portion close to the refrigerant introduction path is set to be the narrowest, and the forward cross-sectional area is set to be wide stepwise or steplessly in the circumferential direction toward the refrigerant discharge path side. A stator cooling structure for a multi-axis multi-layer motor.

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