JP4135611B2 - Stator structure of rotating electrical machine - Google Patents

Description

  The present invention relates to a stator structure of a rotating electric machine applied to a hybrid vehicle or the like.

As a rotating electrical machine applied to a hybrid drive unit, a rotating electrical machine that is driven by a composite current and includes an outer rotor, an inner rotor, and a single stator sandwiched between the outer rotor and the inner rotor is known. Yes. Since the stator support structure of the rotating electrical machine is a structure in which one stator is sandwiched between two rotors, a member for connecting the outer rotor and the shaft is disposed on one end side of both ends of the stator. The stator is cantilevered with respect to the motor case (see, for example, Patent Document 1).
JP2003-34153A.

  However, in the conventional stator structure of a rotating electric machine, the stator support member on the side opposite to the motor case that is cantilevered is divided into the same number as the plurality of laminated cores with coils. There is a problem that the supporting rigidity is low with respect to the direction torque and the number of parts is large.

  The present invention has been made paying attention to the above problems, and provides a stator structure for a rotating electrical machine that has high support rigidity with respect to circumferential torque and that can contribute to cost reduction with a small number of parts. With the goal.

  In order to achieve the above object, in the stator structure of the rotating electrical machine of the present invention,

  Driven by composite current, consisting of multiple rotors and one stator,

  In the rotating electrical machine having a stator support member for supporting the stator by arranging a plurality of laminated cores with coils in an annular shape,

  The stator support member is

  An integral metal part fixed to the rotating electrical machine case, the body part in which the laminated core with the coil is arranged extends in the axial direction with a comb-like part, and only one of them is connected in an annular shape;

An annular part that is bolted to the side of the integrated metal part that is not connected to the annular shape, and a plurality of metal members are laminated while being insulated ;

  The means consisting of

  Therefore, in the stator structure of the rotating electrical machine of the present invention, the stator support member is configured by bolting the integrated metal part and the annular part, so that the support rigidity with respect to the circumferential torque is obtained. It is high and the number of parts is small, which can contribute to cost reduction.

  Hereinafter, the best mode for realizing the stator structure of a rotating electrical machine of the present invention will be described based on Example 1 shown in the drawings.

  First, the configuration will be described.

  [Overall configuration of hybrid drive unit]

  FIG. 1 is an overall view of a hybrid drive unit to which the rotating electrical machine according to the first embodiment is applied. As shown in FIG. 1, the hybrid drive unit includes an engine E, a multi-axis multilayer motor M (rotating electrical machine), and a Ravigneaux type composite. A planetary gear train G, a drive output mechanism D, a motor cover 1, a motor case 2, a gear housing 3, and a front cover 4 are provided.

  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 an engine clutch 7. Yes.

  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 the row G.

  The Ravigneaux type planetary gear train G is a differential gear mechanism having a continuously variable transmission function that continuously changes a transmission gear ratio 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, 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 low brake 10 is interposed between the first ring gear R1 and the gear housing 3 so as to be fixed to the low speed gear ratio by fastening. 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 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

  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.

[Configuration of multi-axis multilayer motor]
FIG. 2 is a longitudinal side view showing the multi-axis multilayer motor M according to the first embodiment, FIG. 3 is a longitudinal front view showing a 1/3 model of the multi-axis multilayer motor M according to the first embodiment, and FIG. 3 is a diagram illustrating an example of a composite current applied to a stator coil of a multilayer motor M. FIG.

  The inner rotor surface of the inner shaft IR of the multi-axis multilayer motor M 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 are embedded in the inner rotor IR in the axial direction with respect to the laminated core 20 made of laminated electromagnetic steel plates in consideration of magnetic flux formation. Further, the inner rotor IR is divided into two in the axial direction as a cogging torque reduction measure, and the arrangement of the inner rotor magnet 21 is shifted in the circumferential direction, for example, a skew angle of 10 degrees is set. Here, the “cogging torque” refers to a change with respect to the rotation angle of the torque based on the shaft attractive force generated between the stator S and the inner rotor IR, that is, so-called torque unevenness. However, the four inner rotor magnets 21 by W-shape arrangement | positioning comprise 1 pole pair, and are 3 pole pairs in the perimeter.

  The stator S of the multi-axis multilayer motor M is a stationary member fixed to the motor case 2, and includes a plurality of laminated cores 40 formed by laminating electromagnetic steel plates, coils 41 wound around each laminated core 40, and 18 pieces. And a stator support member that supports the laminated core 40 with a coil arranged in an annular shape. Here, the stator support member includes an integrated metal part 42 made of aluminum metal, an annular part 43 made of iron metal, and a bolt 44 that fastens and fixes both parts 42 and 43. Has been. The 18 laminated cores 40 with coils are arranged on the circumference while repeating a 6-phase coil three times. The 6-phase coil is compounded from an inverter not shown through a bus bar axial laminated body 73. A current is applied (see FIG. 4). This composite current is a combination of a three-phase alternating current for driving the inner rotor IR and a six-phase alternating current for driving the outer rotor OR.

  The outer cylindrical surface of the outer rotor OR of the multi-axis multilayer motor M is 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 this outer rotor OR, as shown in FIG. 3, outer rotor magnets 61 arranged in consideration of magnetic flux formation with respect to the laminated core 60 made of laminated electromagnetic steel plates are arranged in the axial direction 12 through spaces at both end positions. This is buried. The outer rotor magnet 61 is different from the inner rotor magnet 21 in that the two outer rotor magnets 61 constitute a single pole pair, and the entire circumference is a six pole pair.

  [Stator structure]

  FIG. 5 is a perspective view showing the stator structure of the multi-axis multilayer motor M of the first embodiment, and FIG. 6 is a partial side view showing the stator structure of the multi-axis multilayer motor M of the first embodiment.

  As shown in FIG. 2, the stator support member is fastened and fixed by bolts 46 to a stator shaft 45 on the front side through which the first motor hollow shaft 8 passes, and a body portion that annularly arranges the laminated cores 40 with coils is formed. The comb-like column part 42b extends in the axial direction, and only one of the parts is connected by an annular base part 42c, and is fastened by a bolt 44 to the side of the integrated metal part 42 not connected to the annular shape. An annular component 43 in which six metal members 43a, 43b, 43c, 43d, 43e, and 43f are stacked. The stator fixing case 45 is fastened and fixed to the motor case 2 by bolts not shown.

  As shown in FIG. 2, in the integrated metal part 42, a column part 42b including a circulating water channel 42a formed by casting a copper pipe or the like is formed in a comb shape from an annular base part 42c. The annular base portion 42c is formed integrally with a casting water passage 42d in which all the circulation water passages 42a are connected in parallel, and a bus bar space 42e in which a bus bar axial direction laminate 73 connected to the coil 41 can be installed. Has been.

  As shown in FIG. 2, the stator shaft 45 is fastened by an annular base portion 42c of the integrated metal part 42 and a bolt 46 so that the communication water passage 42d and the bus bar space 42e can be watertight, and a motor. It has a mounting surface 45a with the case 2, an unillustrated inlay and mounting bolt tap, a water supply / drainage port 45b, and a bus bar outlet 45c.

  As shown in FIG. 2, the annular member 43 is a member in which six metal members 43a, 43b, 43c, 43d, 43e, and 43f are integrated by a molding process while maintaining insulation from each other. The fastening points per piece of the metal member are provided at places where the integral value of the magnetic flux density passing through the plane surrounded by the fastening part is always zero, and the six metal members 43a, 43b, 43c, 43d, 43e, and 43f are arranged out of phase in the circumferential direction, and are fastened to all the comb-like column portions 42b of the integrated metal part 42.

The fastening locations per piece of the metal members 43a, 43b, 43c, 43d, 43e, and 43f constituting the annular part 43 are as follows.
P = N / k (P is the number of fastening points, k is a natural number from 1 to N ) (1)
The fastening points are provided at equal intervals with respect to the shaft.

  That is, in the first embodiment, the inner rotor IR is a 3-pole pair, and the outer rotor OR is a 6-pole pair. At this time, the outer rotor OR having a large number of pole pairs has a relationship of 6 = 3 × 2 with respect to the number of pole pairs of the inner rotor IR. Therefore, k = 1 in the above equation (1), and three fastening portions can be allowed together with the inner rotor IR. Further, by providing the three locations at equal intervals of 120 degrees, the magnetic flux passing through the area surrounded by the fastening portion is always zero, and no induced current is generated. This makes it possible to keep Joule loss low.

  Further, since the comb-like column portions 42b of the integrated metal part 42 are 18 in total, all the comb-like column portions 42b are fastened by setting the number of fastenings at three places to six. . As shown in FIG. 5, the six metal members 43a, 43b, 43c, 43d, 43e, and 43f have an overhang at the fastening portion, and the thin plate portion on the inner peripheral side is connected in an annular shape, and the thin plate portion is a shaft. By changing the direction position, as shown in FIG. 6, six sheets are overlapped on the same fastening surface. Furthermore, between the metal members 43a, 43b, 43c, 43d, 43e, and 43f, the circumferential direction and the axial direction are fixed by a process such as a mold that is integrally fixed while being subjected to an insulation process.

  Next, the operation will be described.

  [Basic functions of multi-axis multilayer motor]

  By adopting a multi-axis 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.

  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, which is advantageous in terms of space, cost, and weight, and can be used as a common coil. Thus, loss due to current (copper loss, switching loss) can be prevented.

  Moreover, it has a high degree of freedom of selection such that it is possible to use (motor + motor) or (generator + generator) as well as the usage of (motor + generator) only by composite current control. When the hybrid vehicle is adopted as a driving source as in 1, the most effective or efficient combination can be selected from these many options according to the vehicle state.

  [Stator support function]

  In the conventional stator structure, since the laminated core supporting member on one side in the axial direction is divided into the same number as the laminated core, there is a problem that the supporting rigidity is low with respect to the torque in the circumferential direction and the number of parts is large.

  On the other hand, in the stator structure of Example 1, instead of the iron core support member divided into the same number as the iron core on one side in the axial direction, six metal members 43a, 43b, 43c, 43d, 43e, and 43f are laminated. Therefore, high support rigidity is ensured with respect to the torque in the circumferential direction.

  In addition, since the stator support member is composed of the integrated metal part 42 and the annular part 43, and most of the stator support structure is integrated, the number of parts can be reduced and the assembly process can be simplified. Can contribute to cost reduction.

  [Motor efficiency improvement]

If the laminated core support member is replaced with an annular part, a surface surrounded by a conduction path that alternates with the magnetic flux in the stator support structure appears, resulting in a decrease in efficiency.
In other words, the stator or rotor of a rotating electrical machine is composed of a plurality of laminated electromagnetic steel plates to reduce eddy current loss in a magnetic path through which magnetic flux passes, but an annular component is a part of a conduction path. When the magnetic flux alternates on the surface of the closed circuit formed as described above, an induced current flows thereby, causing Joule loss, and the motor efficiency cannot be increased.

  On the other hand, in Example 1, the fastening points per metal member are provided at equal intervals at three places where the integral value of the magnetic flux density passing through the plane surrounded by the fastening portion is always zero, Since the six metal members 43a, 43b, 43c, 43d, 43e, and 43f, which are the same as the metal members, are arranged out of phase in the circumferential direction, the magnetic flux passing through the area surrounded by the fastening portion is always zero, and the induction Does not generate current. As a result, Joule loss can be kept small, and high motor efficiency can be realized.

Next, the effect will be described.
In the multi-axis multilayer motor M of the first embodiment, the effects listed below can be obtained.

(1) Driven by a composite current, comprising a plurality of rotors and one stator, the stator comprising a plurality of laminated cores 40 formed by laminating electromagnetic steel plates, coils 41 wound around each laminated core 40, and A rotating electrical machine having a stator supporting member that supports a plurality of laminated cores 40 with coils 41 arranged in an annular shape, and the stator supporting member is fixed to the rotating electrical machine case, and a cylinder on which the laminated cores 40 with coils 41 are arranged. A part is extended in the axial direction by a comb-like column part 42b, and only one side is connected in an annular shape, and bolted to the side of the integrated metal part 42 not connected in an annular shape, Since the metal members 43a, 43b, 43c, 43d, 43e, and 43f are annular parts 43 that are laminated while being insulated , the support rigidity is high with respect to circumferential torque. In addition, the number of parts is small, which can contribute to cost reduction.

(2) The annular part 43 has an integral value of magnetic flux density passing through a plane surrounded by the fastening portion at a fastening portion per one of the plurality of metal members 43a, 43b, 43c, 43d, 43e, 43f. A plurality of metal members 43 a, 43 b, 43 c, 43 d, 43 e, 43 f similar to the metal members are arranged at different positions in the circumferential direction. Since it is fastened to all of the tooth-like column parts 42b, the surface surrounded by the conduction path that appears by the fastening part of the comb-like integrated metal part 42 and the annular part 43 does not cross the magnetic flux. It is possible to avoid the generation of induced voltage and induced current due to the motor and to achieve high motor efficiency.

(3) The fastening portion per piece of the metal member constituting the annular part 43 is N, which is the smaller number of rotor pole pairs.
P = N / k (P is the number of fastening points, k is a natural number from 1 to N )
Since the fastening points are provided at equal intervals with respect to the shaft, the sum of the magnetic flux generated by the stator and the magnetic flux generated by the other rotor becomes zero, and the induced voltage and induced current due to the magnetic flux alternating Thus, high efficiency of the motor can be realized, and the stator support structure can be configured with high rigidity.

  (4) Since the integrated metal part 42 has a water channel structure in which a circulation water channel 42a is formed inside the comb-like column part 42b and can be supplied and drained collectively from the side connected in an annular shape, the number of parts is small. The cooling structure of the rotating electrical machine is configured, and the assembly man-hour and cost can be reduced.

  As mentioned above, although the stator structure of the rotary electric machine of the present invention has been described based on the first embodiment, the specific configuration is not limited to the first embodiment, and the invention according to each claim of the claims. Design changes and additions are permitted without departing from the gist of the present invention.

  In the first embodiment, an example of a multi-axis multilayer motor applied to a hybrid drive unit as a rotating electrical machine has been shown. However, the stator structure of the rotating electrical machine of the present invention is driven by a composite current, and includes a plurality of rotors and a single stator. If it becomes the rotary electric machine which becomes, it can apply also to the rotary electric machine used for another use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic overall view showing a hybrid drive unit to which a multi-axis multilayer motor (rotary electric machine) of Example 1 is applied. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view illustrating a multi-axis multilayer motor M according to a first embodiment. 1 is a longitudinal front view showing a 1/3 model of a multi-axis multilayer motor M according to Embodiment 1. FIG. 3 is a diagram illustrating an example of a composite current applied to a stator coil of the multi-axis multilayer motor M of Embodiment 1. FIG. FIG. 5 of the first embodiment is a perspective view showing a stator structure of the multi-axis multilayer motor M of the first embodiment. 1 is a partial side view showing a stator structure of a multi-axis multilayer motor M of Embodiment 1. FIG.

Explanation of symbols

M Double-axis multilayer motor (rotary electric machine)
S stator
IR inner rotor
OR outer rotor 8 first motor hollow shaft 9 second motor shaft 20 laminated core 21 inner rotor magnet 40 laminated core 41 coil 42 integral metal part 42a circulating water channel 42b pillar part 42c annular base part 43 annular metal part 43a metal member 43b Metal member 43c Metal member 43d Metal member 43e Metal member 43f Metal member 44 Bolt 45 Stator shaft 60 Laminated core 61 Outer rotor magnet

Claims (4)

Driven by composite current, consisting of multiple rotors and one stator,
The stator has a plurality of laminated cores formed by laminating electromagnetic steel sheets, a coil wound around each laminated core, and a stator support member that supports the plurality of laminated cores with coils arranged in an annular shape and supported. In electric
The stator support member is
An integral metal part fixed to the rotating electrical machine case, the body part in which the laminated core with the coil is arranged extends in the axial direction with a comb-like column part, and only one of them is connected in an annular shape;
An annular part that is bolted to the side of the integrated metal part that is not connected to the annular shape, and a plurality of metal members are laminated while being insulated ;
A stator structure for a rotating electrical machine comprising: In the stator structure of the rotating electrical machine according to claim 1,
The fastening portion per metal member in the annular part is provided at a location where the integral value of the magnetic flux density passing through the plane surrounded by the fastening portion is always zero, and a plurality of metals similar to the metal member is provided. A stator structure for a rotating electrical machine, wherein the members are arranged out of phase in the circumferential direction, and are fastened to all of the comb-like column portions of the integrated metal part. In the stator structure of the rotating electrical machine according to claim 1 or 2,
The fastening portion per piece of the metal member constituting the annular part is, when N is the smaller number of rotor pole pairs,
P = N / k (P is the number of fastening points, k is a natural number from 1 to N )
A stator structure for a rotating electric machine, characterized in that the fastening points are provided at equal intervals with respect to the shaft. In the stator structure of the rotating electrical machine according to any one of claims 1 to 3,
A stator structure for a rotating electrical machine, wherein the integrated metal part has a water channel structure in which a circulation water channel is formed inside a comb-like column portion and water can be supplied and drained collectively from a side connected in an annular shape.

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