JP2005218207A - Stator structure of pluriaxial multilayer motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator structure of a pluriaxial multilayer motor for forming a simple structure of a cooling medium flow path, ensuring sealability using a simple structure and enhancing the cooling efficiency of a stator. <P>SOLUTION: The stator structure of the pluriaxial multilayer motor comprises teeth 204 having cores 202 to which coils 203 are wound, an inner circumferential post 205 and an outer circumferential post 206 formed of a nonmagnetic material and alternately and hermetically joined. A partitioning plate 207 is provided between the adjacent teeth 204. The teeth 204, the inner and outer circumferential posts 205, 206 located on both sides of the teeth 204 and the partitioning plate 207 form the cooling medium flow path 208. An inlet 208A and an outlet 208B are alternately disposed on one side of the adjacent cooing medium flow path in the circumference. A stator cover 210 is provided and has a plurality of U-shaped flow paths 209 for hermetically communicating with other sides of a plurality of the cooling medium flow paths. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a multi-axis multilayer motor, and more particularly to a stator structure of a multi-axis multilayer motor in which two rotors are driven by a single stator.

This type of multi-axis multi-layer motor is disclosed in, for example, Patent Document 1, and this multi-axis multi-layer motor 301 includes a motor housing 341 as shown in a sectional view in a plane including the central axis in FIG. Inside, the stator 320, the inner rotor 310 arrange | positioned at the inner peripheral side of this stator 320, and the outer rotor 330 arrange | positioned at the outer peripheral side of the said stator are provided.
The stator 320 is a split coil type stator in which teeth formed by winding a coil (not shown) around a core are arranged at predetermined intervals in the circumferential direction.

  A water jacket 380 that circulates the refrigerant inside the stator 320 is formed on the outer periphery of the bolt 343 that fixes the core, and an inlet 385 for flowing the refrigerant into the water jacket 380 on the rear side of the stator 320 and An outlet 386 is provided, and the front side of each water jacket 380 is communicated with a U-turn channel 384. Thereby, the heat generated by the stator 320 is absorbed by the refrigerant, and the stator 120 is cooled.

The multi-axis multi-layer motor 301 connects the coils of the stator 320 in multiple phases, and a composite current obtained by combining the current for controlling the rotation of the inner rotor 310 and the current for controlling the rotation of the outer rotor 330 to the coil. By supplying and changing the magnetic flux, the rotation of the inner rotor 310 and the outer rotor 330 can be controlled independently.
JP 2001-14086 A

  However, in the multi-axis multilayer motor 301 as described above, the water jacket 380 is provided around the bolt 343 that passes between adjacent cores and fixes the core, so that the structure is complicated and the adjacent cores If the gap is not molded, there is a problem that the sealing performance of the water jacket 380 as the coolant channel cannot be maintained. Further, since the coolant is circulated through the water jacket 380 provided around the bolt 343 from the inner periphery of the core of the stator 320 to cool the stator 320, the coil or iron loss is likely to generate heat due to copper loss, iron loss, or the like. The core in the vicinity thereof cannot be directly cooled, and the cooling efficiency is not always good because the heat is indirectly cooled through the core.

  An object of the present invention is to solve the above-described problems, and an object of the present invention is to form a refrigerant flow path with a simple structure and to provide a simpler seal. And providing a stator structure of a multi-axis multilayer motor that can further enhance the cooling efficiency of the stator.

In order to achieve the above-mentioned object, the invention according to claim 1 is the invention in which teeth formed by winding a coil around a core, inner peripheral struts and outer peripheral struts are alternately liquid-tightly joined, and inner peripheral struts And a stator having a partition plate for liquid-tightly connecting the outer support column, an inner rotor disposed on the inner periphery side of the stator, and an outer rotor disposed on the outer periphery side of the stator. In the stator structure of a shaft multilayer motor,
Each tooth, a partition plate located on both sides thereof, an inner peripheral strut and an outer peripheral strut define a refrigerant flow path, and one of the adjacent refrigerant flow paths is alternately used as an inlet and an outlet in the circumferential direction. A stator cover having a plurality of U-turn flow paths is provided, which fluidly communicates the other side of the plurality of pairs of refrigerant flow paths with each other.

  According to the first aspect of the invention, the refrigerant flow path for cooling the stator can be configured with a simpler structure, and the sealing performance can be ensured. In addition, the coil and its vicinity, which are parts where heat is easily generated due to copper loss and iron loss, are defined on both sides of the tooth by defining the coolant flow path by the teeth, the inner periphery side support column, the outer periphery side support column and the partition plate. The core of the stator can be directly cooled, and the contact area to the refrigerant as the whole stator can be increased to increase the cooling efficiency, and the inner peripheral column, outer peripheral column and partition plate are adjacent to each other. By interposing between the teeth, the rigidity of the entire stator can be increased.

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is an overall view of a hybrid drive unit to which a multi-axis multilayer motor as an example of a rotating electrical machine having a stator structure of the present invention is applied. The multi-axis multi-layer motor described below is for explaining the basic configuration, and features of the present invention will be described in detail later. In FIG. 1, E is an engine, M is a multi-shaft multilayer 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, 4 is a front cover is there.

  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 via a rotation fluctuation absorbing damper 6 and a multi-plate clutch 7. ing.

  The multi-axis multilayer motor M is a sub-power source having two motor generator functions although it is one motor in appearance. This multi-shaft multilayer motor M is fixed to the motor case 2 and has a stator S as a fixed armature wound with a coil, an inner rotor IR disposed inside the stator S and embedded with permanent magnets, and the stator The outer rotor OR, which is disposed 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 planetary gear train G, and the second motor shaft 9 fixed to the outer rotor OR is connected to the Ravigneaux type planetary gear. It is connected to the second sun gear S2 of the row G.

  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 rotational elements of 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.

  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 16 and 16. The output rotation and output torque from the output gear 11 pass through the first counter gear 12, the second counter gear 13, the drive gear 14, and the differential 15, and are transmitted from the drive shafts 16 and 16 to the drive wheels (not shown). The

  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 the second sun gear S2 and the second motor shaft 9. And the output gear 11 is connected to the common carrier C.

  FIG. 2 is a diagram showing in more detail an example of a multi-axis multilayer motor that is combined with a Ravigneaux type planetary gear train and constitutes a vehicle hybrid transmission that is an object of the present invention. The laminated core structure of the present invention can be applied to this multi-axis multilayer motor. The multi-axis multilayer motor having the configuration shown in FIG. 2 includes a single annular stator 101, an inner rotor 102 disposed rotatably on a predetermined rotation axis O coaxial with each other in the radial direction inside and outside, and A triple structure including the outer rotor 103 is formed and housed in the housing 104.

  Each of the inner rotor 102 and the outer rotor 103 includes laminated cores 124 and 125 that are laminated in the rotor axial direction of a plate material made by press-molding electromagnetic steel sheets and the like. Permanent magnets penetrating in the direction are arranged at equal intervals in the circumferential direction. In the inner rotor 102 and the outer rotor 103, the number of pole pairs between them is made different by changing the number of magnetic poles to be arranged. As an example, the number of magnets itself is the same for the inner rotor 102 and the outer rotor 103, which is twelve. However, since the inner rotor 102 forms one pole with two magnets, Since the outer rotor 103 forms one pole with one magnet, the number of pole pairs is six.

  When the inner rotor 102 and the outer rotor 103 are accommodated in the housing 104, the outer rotor 103 is provided with a torque transmission shell 105 drivingly coupled to the outer periphery of the laminated core 125, and both ends of the torque transmission shell 105 are respectively provided as bearings. The torque transmission shell 105 is coupled to the outer rotor shaft 109 on the bearing 107 side.

  The inner rotor 102 is provided at the center of the laminated core 124 with a hollow inner rotor shaft 110 penetrating the outer rotor shaft 109 rotatably therein, and between the laminated core 124 of the inner rotor 102 and the inner rotor shaft 110. Drive coupled. An intermediate portion of the inner rotor shaft 110 is rotatably supported in a fixed stator bracket 113 by a bearing 112, and one end portion (left end portion in FIG. 1) is rotatable to a corresponding end wall of the torque transmission shell 105 by a bearing 114. To support.

  The stator 101 includes a large number of cores formed by laminating T-shaped stator steel plates made by press-forming electromagnetic steel plates in the stator axial direction. As shown in the lower side of FIG. 2, coils 117 are wound on each core to form teeth, and these teeth are arranged at equal intervals in the circumferential direction, that is, in an annular shape, and these are arranged in the stator axial direction. The stator 101 is configured by being sandwiched between the brackets 113 and 118 on both sides by some means and integrated by being molded entirely with the resin 120.

  In driving the motor, the rotation positions of the inner rotor 102 and the outer rotor 103 detected by the rotation sensor 148 and the rotation sensor 147, that is, the positions of the two rotors 102 and 103 corresponding to the positions of the permanent magnets provided as described above. The composite current obtained by combining the drive currents having different phases is supplied to the electromagnetic coil 117 of the stator 101, thereby generating the rotating magnetic fields for the rotors 102 and 103 individually in the stator, thereby generating the rotating magnetic field. In synchronism, both rotors 102 and 103 can be individually rotated.

Embodiments of a stator structure of a multi-axis multilayer motor according to the present invention will be described below with reference to the drawings.
FIG. 3 is a perspective view showing a stator structure of a multi-axis multi-layer motor showing an embodiment of the present invention.
The stator 201 of this multi-axis multi-layer motor has teeth 204 formed by winding a coil 203 around a core 202 at predetermined intervals in the circumferential direction, and is positioned adjacent to the extended surface of the inner peripheral surface of the teeth 204. The gap between the adjacent teeth 204 is liquid-tightly closed, and is positioned adjacent to the inner peripheral support column 205 and the extended surface of the outer peripheral face of the teeth 204, and the gap between the adjacent teeth is liquid-tightly closed. The outer peripheral side support 206 is provided,
A partition plate 207 for liquid-tightly connecting the inner peripheral column 205 and the outer peripheral column 206 is provided between adjacent teeth 204. Each of the teeth 204, the inner column 205 and the outer column 206 positioned on both sides thereof are provided. The refrigerant flow path 208 is defined by the partition plate 207, and one of the adjacent refrigerant flow paths 208 is alternately used as the inlet 208A and the outlet 208B in the circumferential direction of the motor. The stator cover 10 having a plurality of U-turn flow paths 209 that fluidly communicate with the refrigerant flow path 208 having the corresponding outlet 208B is provided. (Equivalent to claim 1)

  Here, the stator cover 210 has a cylindrical inner peripheral surface plate 210a, a cylindrical outer peripheral surface plate 210b, an annular back plate 210c, and a partition plate 210d provided at a pitch that is ½ of the arrangement pitch of the partition plates 207. Are joined together with an adhesive or the like, or integrally molded, and formed as shown. The inner peripheral surface plate 210 a of the stator cover 210 is liquid-tightly joined to the inner peripheral surface side and inner peripheral column 205 at both ends in the axial direction of the core 202 via a resin layer (not shown), and the outer peripheral surface plate 210 b is connected to both ends in the axial direction of the core 202. The outer peripheral surface side and the outer peripheral side support 206 are liquid-tightly bonded via a resin layer (not shown), and the partition plate 210c is liquid-tightly connected to the partition plate 207 of the stator 201 via a resin layer (not shown). Be joined. Thereby, the several U-turn flow path 209 which connects the refrigerant flow path 208 fluid-tightly can be comprised.

The refrigerant flow path 208 is a stator having a refrigerant introduction path provided in the mold resin portion, a refrigerant distribution lid member (gallery plate front), a refrigerant distribution plate member (separator), and the U-turn flow path 209 (not shown in FIG. 3). Based on the combination with components such as a cover, a cooling system is configured and the teeth 204 are cooled.
Note that the left side of the figure may be the rear side, the right side may be the front side, the left side may be the front side, and the right side may be the rear side.

FIG. 4 is a cross-sectional view in a plane including the central axis of the stator of the multi-axis multilayer motor showing the embodiment of the present invention.
The core 202 has a substantially T-shaped cross-sectional shape, and as shown in the drawing, a coil 203 is wound in a step shape to form a tooth 204. Teeth 204 is provided in an annular shape at a predetermined interval, and is adjacent to the extended surface of the inner and outer peripheral surfaces thereof, and closes the gap between adjacent teeth 204 in a liquid-tight manner, and has an approximately trapezoidal cross-sectional shape. A support column 205 and an outer peripheral support column 206 are provided, and a partition plate 207 is provided for connecting the support columns in a liquid-tight manner. A refrigerant flow path 208 is formed by the teeth 204, the inner peripheral struts 205, the outer peripheral struts 206, and the partition plates 207 located on both sides thereof.

FIG. 5 is a perspective view showing a stator structure of a multi-axis multi-layer motor showing another embodiment of the present invention.
Compared to the stator structure shown in FIG. 3, the stator structure shown in FIG. 5 has a stator cover side end portion of the partition plate 207 that is arranged in the circumferential direction, and the motor center axis direction is higher than the coil 203 of the teeth 204. In the same manner, a cap-shaped resin layer having a shape in which only the partition plate 207a with the end protruding is fitted to the cap-shaped stator cover 211 made of a hard member as shown in the figure. A bolt (not shown) is inserted into the bolt hole 211c of the outer periphery side fastening portion 211a and the inner periphery side fastening portion 211b that are joined to each other via the stator cover 211 and provided on the stator side (not shown). The stator cover 211 is liquid-tightly joined to the stator 201 by being screwed into the bolt hole. (Equivalent to claims 2 and 4)

  According to this, compared to the stator structure shown in FIG. 3, with a simpler structure, the short partition plate 207 b that does not project the adjacent refrigerant flow path, the back surface 211 d and the side surface of the annular stator cover 211. It can be made to communicate in the U-turn channel defined between 211e. Further, the stator cover 211 can be joined to the stator 201 via the resin layer 212 by a simpler method such as bolting.

Here, as shown in FIG. 6, if the partition plate 207, the inner peripheral column 205 and the outer peripheral column 206 are formed integrally, the integrated member forms a so-called I-shaped beam, and its unit cross-sectional area is Therefore, the rigidity of the stator can be increased with the high rigidity. (Equivalent to claim 3)
Further, as shown in FIG. 6, instead of the cap-shaped resin layer 212, only the surfaces of the core 202, the inner peripheral side strut 205, the outer peripheral side strut 206, and the partition plate 207 that are joined to the stator cover 211 are hatched in advance. The illustrated resin layer 213 can be adhered to join the stator cover 211 to the stator. According to this, it is possible to reduce the manufacturing cost by making the amount of resin used as small as possible while ensuring the liquid tightness of the U-turn flow path. (Equivalent to claim 5)

FIG. 7 is a schematic development view of a stator structure of a multi-axis multilayer motor as seen from the outside in the motor radial direction, showing still another embodiment of the present invention.
In FIG. 7, the stator cover and the resin layer are omitted in order to describe the end of the partition plate 207 in detail.
In addition to the structure shown in FIG. 5, in the stator structure shown in FIG. 7, the partition plate 207, the inner peripheral side column 205, and the outer peripheral side column 206 are integrally formed of a resin, and the partition plate 207 is provided with a reinforcing material inside. The cored bar 213 is embedded (corresponding to claim 6), and unevenness 214 is provided on the side surface of the partition plate 207 facing the refrigerant flow path (corresponding to claim 7).

Thus, by making the partition plate 207 resin, there is no need to provide a resin layer between the partition plate 207 and the stator cover, and the cap-shaped resin layer as shown in FIG. As a result, the liquid-tightness can be ensured and the manufacturing cost can be reduced. Here, if the partition plate 207 is made of resin, the strength is inferior. Therefore, a cored bar 213 as a reinforcing material is embedded in the partition plate 207 to ensure the rigidity of the partition plate 207.
Further, by providing irregularities 214 on the side surface of the partition plate 207 facing the refrigerant flow path as shown in the figure, the contact area of the partition plate 207 with the refrigerant is increased, and the flow of the refrigerant is turbulent to reduce the cooling performance. Can be further increased. Here, the projections of the projections and depressions 214 are provided in the form of increasing the thickness of the partition plate 207 where the cored bar 213 is provided, but the configuration of the projections and depressions is not limited to this.

FIG. 8 is a schematic cross-sectional view showing the AA cross section and the BB cross section of the stator structure shown in FIG. 7, and shows a joining mode of the partition plate and the stator cover.
As shown in FIG. 8 (a), the long partition plate 207 a is joined to the stator cover 211 via the resin layer 212 at its end, outer peripheral surface, and inner peripheral surface.
As shown in FIG. 8B, the short partition plate 207b is joined to the stator cover 211 except for its end portion and the outer peripheral surface and the end portion side of the outer peripheral surface, and the end portion of the partition plate 207b and the stator A gap is provided between the cover 211 and the U-turn channel 209 that communicates with the adjacent refrigerant channel 208.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible.

  The stator structure of the present invention is particularly suitable for application to a multi-shaft multilayer motor in which two rotors are driven by a single stator, and is particularly advantageous for improving cooling performance and simplifying the structure.

1 is a schematic overall view showing a hybrid drive unit to which a multi-axis multilayer motor is applied. It is a vertical side view showing a multi-axis multilayer motor which is a subject of the stator structure of the present invention, which is combined with a Ravigneaux type planetary gear train to constitute a hybrid transmission for a vehicle. It is a perspective view which shows the stator structure of the multi-axis multilayer motor which shows one Embodiment of this invention. FIG. 4 is a radial cross-sectional view of the stator shown in FIG. 3. It is a perspective view which shows the stator structure of the multi-axis multilayer motor which shows other embodiment of this invention. It is a schematic diagram which shows the structure of the inner peripheral side support | pillar of the stator structure of the multiaxial multilayer motor of this invention, an outer peripheral side support | pillar, and a partition plate. FIG. 6 is a schematic development view showing a stator structure of a multi-axis multilayer motor as seen from the outside in the radial direction of the motor, showing still another embodiment of the present invention. It is a schematic cross section which shows the AA cross section and BB cross section of FIG. It is sectional drawing containing the center axis line of the conventional multi-axis multilayer motor.

Explanation of symbols

201 Stator 202 Core 203 Coil 204 Teeth 205 Inner peripheral strut 206 Outer peripheral strut 207 Partition plate 208 Refrigerant flow path 209 U-turn flow path 210 Stator cover 211 Stator cover (cap shape)
212 Resin layer (cap shape)
213 Resin layer 214 Concavity and convexity

Claims (7)

A stator formed by winding a coil around a core, an inner peripheral column and an outer column made of a non-magnetic material, and an inner layer disposed on the inner peripheral side of the stator In the stator structure of a multi-axis multilayer motor comprising a rotor and an outer rotor disposed on the outer peripheral side of the stator,
A partition plate is provided between adjacent teeth, and a refrigerant flow path is defined by each of the teeth, the inner peripheral side struts, the outer peripheral side struts, and the partition plates located on both sides thereof. A multi-shaft multilayer motor comprising a stator cover having a plurality of U-turn flow paths, which alternately communicate with each other in a liquid-tight manner as the inlets and outlets in the direction. Stator structure. The stator cover side end of the partition plate is protruded in the motor central axis direction from the teeth coil every other circumferential direction, and only the protruded partition plate is liquid-tightly joined to the stator cover. The stator structure of a multi-axis multilayer motor according to claim 1. The stator structure for a multi-axis multilayer motor according to claim 1 or 2, wherein the partition plate, the inner peripheral side support column, and the outer peripheral side support column are integrally formed. The stator structure of the multi-shaft multilayer motor according to any one of claims 1 to 3, wherein the stator cover and the core, the inner peripheral support column, the outer peripheral support column and the partition plate are joined via a resin layer. The stator structure of the multi-shaft multilayer motor according to any one of claims 1 to 3, wherein a resin layer is bonded in advance to a joint surface of the core, the inner peripheral side strut, the outer peripheral side strut and the partition plate with the stator cover. The stator structure of the multi-shaft multilayer motor according to any one of claims 1 to 3, wherein the inner peripheral side support column, the outer peripheral side support column and the partition plate are integrally formed of resin, and a reinforcing material is embedded in the partition plate. The stator structure of the multi-shaft multilayer motor according to any one of claims 1 to 7, wherein irregularities are provided on both side surfaces forming the refrigerant flow path of the partition plate.

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