JP4292050B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a stator for a rotating electrical machine having a stator core in which a plurality of coils are annularly arranged and a conductor unit that is coaxially arranged with respect to the stator core.

  Conventionally, a coil connection structure in a stator of a rotating electrical machine has a connection unit in which conductors of each phase are stacked and fixed in an electrically insulated state, and a conductive wire derived from a coil wound around a stator core tooth is used for connection. What is known to be connected to a substantially U-shaped fixed part formed at a predetermined interval on the outer peripheral part of the unit by crimping or fusion (soldering or the like) (for example, see Patent Document 1). Such a connection structure is suitable because the overall shape can be reduced in size.

Japanese Patent Laid-Open No. 6-233383

  By the way, according to the prior art, since the fixing portion of the connection unit must be combined while being positioned with respect to the plurality of conductive wires protruding in the axial direction from the end portion of the coil, the operation may be somewhat difficult. .

  In order to easily perform the wire connection work, for example, a method of bending the lead wire radially outward, inserting a connection unit, and then returning the lead wire to a radially inward fixing portion is also conceivable. When it is applied, it takes a relatively long time.

  Also, a method of providing an intermediate terminal on an insulator (insulator) around which the coil is wound and connecting the end of the coil and the connection unit via the intermediate terminal is conceivable. In this method, As the number of parts as the intermediate terminal increases, the number of work steps for connecting the intermediate terminal to the end of the coil increases.

  The present invention has been made in consideration of such problems, and it is easy to position the end of the coil and the conductor, and can be easily connected, and the rotating electrical machine has a small number of parts. An object is to provide a stator.

  A stator of a rotating electrical machine according to the present invention is a stator of a rotating electrical machine having a stator core in which a plurality of coils are annularly disposed and a conductor unit that is coaxially disposed with respect to the stator core. The end portion protrudes in the radial direction of the stator core, the conductor unit includes a plurality of connection portions protruding in the radial direction facing the end portion, and provided with openings in the circumferential direction. The stator core includes the conductor An axial positioning portion that abuts the unit in the axial direction and rotatably supports the conductor unit, and the stator core and the conductor unit have a rotation stop engagement portion for mutual rotation positioning; The conductor unit is inserted into the axial positioning portion from the axial direction, and then rotated in the opening direction of the opening portion, whereby the step is performed. The core and the conductor unit are locked by the anti-rotation engagement portion, and the end portions are mounted so as to be inserted into the opening portions of the connection portion, respectively, and the connection portion and the end portion are electrically connected. It is characterized by being connected.

  Thus, after inserting the conductor unit from the axial direction with respect to the stator core, by rotating it in the opening direction of the opening of the connection portion, the end portions of the coils are respectively inserted into the opening portions, and the stator core and Rotational positioning with a conductor unit can be performed easily and reliably. Therefore, the positioning of the end of the coil and the conductor is easy, and the wiring can be easily performed. Further, there is no need for intermediate terminals and the number of parts is small.

  Further, the stator core and the conductor unit may have a retaining engagement portion that prevents mutual axial displacement. Thereby, the axial positioning of the stator core and the conductor unit can be easily and reliably performed.

  Further, the stator core may have a hole portion through which a tool for electrically connecting the connection portion and the end portion can be inserted and communicated in the axial direction.

  Furthermore, it is preferable that a side surface of the conductor unit is provided with a guide groove for guiding the end portion to the opening when the conductor unit is mounted on the stator core.

  According to the stator of the rotating electrical machine according to the present invention, the conductor unit is inserted into the stator core from the axial direction, and then rotated in the direction of the opening of the connection portion, thereby inserting the end portions of the coils into the openings. Can be made. Therefore, the positioning of the end of the coil and the conductor is easy, and the wiring can be easily performed. Further, since the end of the coil and the conductor are directly connected, an intermediate terminal or the like is not required and the number of parts is small.

  Embodiments of a stator for a rotating electrical machine according to the present invention will be described below with reference to FIGS. 1 to 10.

  As shown in FIG. 1, a stator 10 according to the present embodiment is applied to a rotating electric machine such as a motor or a generator, and includes a stator core 14 in which 12 coils 12 are arranged in an annular shape, and the stator core. 14 and a conductor unit 16 disposed coaxially on the inner diameter side. The stator core 14 is configured by annularly connecting 12 cores corresponding to each coil 12.

  As shown in FIG. 2 and FIG. 5, each coil 12 is configured by winding a conductive wire (for example, a copper wire having an enamel coating) through an insulator 18 formed of synthetic resin around a tooth 13. The one end portion 20a and the other end portion 20b protrude in the inner diameter direction while being aligned in the circumferential direction of the stator core 14 respectively. The end portions 20a and 20b are held so as to face the inner diameter direction by notches 18a and 18b provided on the inner diameter side upper surface end of the insulator 18, respectively. The end portions 20a and 20b of each coil 12 are arranged in an annular shape at regular intervals.

  The stator 10 is connected by a so-called star connection method, and one end 20a is connected to a U-phase terminal 22a (see FIG. 1), a V-phase terminal 22b, and a W-phase terminal 22c in the order of arrangement. Yes. The other end 20b is connected to each other to form a neutral point.

  The insulator 18 includes a pedestal (axial positioning portion) 26 that is supported in contact with the lower surface of the conductor unit 16 in the axial direction, and the terminals 22a and 22b are located above the pedestal 26 (in the axial direction of the stator 10). 2, 3, 4, and 9). The pedestal 26 includes a first pedestal 28 having the smallest axial width on the inner diameter side, and a second pedestal 30 adjacent to the outer diameter side as viewed from the first pedestal 28.

  The width of the second pedestal 30 in the axial direction is thicker than that of the first pedestal 28, and the diameter of the step surface 32 formed at the boundary between the first pedestal 28 and the second pedestal 30 is the conductor unit 16 described later. Is set to be the same as the outer diameter of the main body 50 (see FIG. 3). The stepped surface 32 has a first recess 34 that is slightly wider and shallower in the circumferential direction centered on a portion that is directly below the end 20a, and a substantially intermediate portion between the end 20a and the end 20b. A second recess 36 having a narrow width and a shallow depth is provided, and a narrow partition wall (rotation stop engaging portion) 38 is formed between the first recess 34 and the second recess 36. The upper part of the first recess 34 is directly connected to the upper surface of the second pedestal 30 and opens upward. The second recess 36 has a partition wall (a retaining engagement portion) 40 at the top, and the top is covered with the partition wall 40.

  Below the end 20a and the end 20b in the second pedestal 30, there are provided a hole 42a and a hole 42b communicating with each other in the axial direction. Each of the hole 42a and the hole 42b is set to a size capable of inserting a tool 100 described later.

  With reference to the upper surface of the first pedestal 28, the height of the end portions 20a and 20b is H1, and the height of the second recess 36 is H2.

  As shown in FIGS. 3 and 4, the conductor unit 16 is based on a cylindrical main body 50 formed of a synthetic resin as an insulator, and is in a radial direction opposite to the end portions 20 a and 20 b, that is, A substantially U-shaped connecting terminal (connecting portion) 24 protruding in the outer diameter direction is provided. Twenty-four connection terminals 24 are provided corresponding to the end portions 20a and 20b, and the substantially U-shaped openings 51 are directed in the same circumferential direction. When viewed from the top, the opening 51 faces clockwise. The height of the opening 51 with respect to the lower surface of the side surface 50a is H1. A hole communicating in the axial direction is provided at the center of the conductor unit 16.

  On the side surface 50a of the main body 50, protrusions 52 are provided in the vicinity of every other twelve connection terminals 24 in the circumferential direction. Each protrusion 52 extends upward with reference to the lower surface of the side surface 50a, and its height is H2.

  When the conductor unit 16 is attached to the stator core 14, each protrusion 52 is inserted into the first recess 34, and thereafter, when the conductor unit 16 is rotated, each protrusion 52 is engaged with the second recess 36. Match. Thus, each protrusion 52 is set to have a small width in the circumferential direction and a protruding amount in the radial direction so that the protrusion 52 can be engaged with the second recess 36.

  In addition, a shallow guide groove 56 for guiding the end portion 54 of the end portions 20a and 20b from the lower portion of the side surface 50a to the opening 51 when the conductor unit 16 is mounted on the stator core 14 is formed on the side surface 50a of the main body 50. Is provided. The guide groove 56 extends from the lower part of the side surface 50a along the upper side in the axial direction, bends in the circumferential direction at the height H1, and extends to the position of the opening 51.

  As shown in FIGS. 3 and 5, the terminals 22 a, 22 b, and 22 c are provided on the upper surface of the main body 50 in the conductor unit 16 through insulating partitions. Inside the main body 50, four bus bars 58a, 58b, 58c and 58d, which are annular conductors separated from each other by an insulator, are provided. The bus bar 58a corresponds to the U phase, and is connected to the terminal 22a and every fourth connection terminal 24. The bus bar 58b corresponds to the V phase, and is connected to the terminal 22b and every fourth connection terminal 24. The bus bar 58c corresponds to the W phase, and is connected to the terminal 22c and every fourth connection terminal 24. The bus bar 58d corresponds to a neutral point and is connected to every other twelve connection terminals 24. The bus bars 58a, 58b and 58c are connected to the end 20a via the connection terminal 24, and the bus bar 58d is connected to the end 20b via the connection terminal 24.

  Next, a procedure for assembling the stator core 14 and the conductor unit 16 configured as described above to form the stator 10 will be described with reference to FIGS.

  First, the conductor unit 16 is placed coaxially from above on the center portion of the stator core 14. At this time, the angle of the conductor unit 16 is adjusted so that each protrusion 52 of the conductor unit 16 is inserted from above with respect to the first recess 34 of the step surface 32, and the side surface 50 a of the conductor unit 16 is changed to the step surface. Place along 32. The main body 50 of the conductor unit 16 is rotatably supported and placed on the first pedestal 28, and the position of the conductor unit 16 in the axial direction with respect to the stator core 14 is determined. At this time, the end portions 20a and 20b and the connection terminal 24 have the same axial height (that is, the height H1) with respect to the upper surface of the first pedestal 28.

  Moreover, as shown in FIG. 6, each connection terminal 24 is arrange | positioned in the substantially intermediate part of the edge parts 20a and 20b. Furthermore, the most distal end portion 54 (see FIG. 4) of the end portions 20 a and 20 b is guided in the axial direction on the side surface 50 a of the conductor unit 16 along the guide groove 56.

  Next, as shown in FIG. 7, on the upper surface of the first pedestal 28, the conductor unit 16 is rotated in the opening direction of the opening 51 of the connection terminal 24, that is, in the clockwise direction. Thereby, the protrusion 52 moves in the first recess 34 and comes into contact with the partition wall 38 which is an end surface.

  Next, as shown in FIG. 8, on the upper surface of the first pedestal 28, the conductor unit 16 is further rotated clockwise with a strong force, so that the protrusion 52 gets over the partition wall 38 and engages with the second recess 36. Then, the conductor unit 16 is fixed.

  That is, since the second recess 36 is narrow in the circumferential direction, the projection 52 does not move in the circumferential direction and acts as a rotation stopper. In particular, since the partition wall 38 exists, the projection 52 is in the direction of the first recess 34. Will never return. Further, since the second recess 36 and the protrusion 52 are each H2 in height, the axial displacement is prevented, and in particular, since the partition wall 40 (see FIG. 2) exists, the protrusion 52 is pulled out upward. There is nothing.

  Further, the second recess 36 may be set slightly smaller than the protrusion 52. In this case, the second recess 36 and the protrusion 52 are engaged with each other with a strong frictional force, and the conductor unit 16 can be more reliably fixed.

  Further, at this time, the most distal end portion 54 (see FIG. 4) of the end portions 20a and 20b is guided in the circumferential direction of the side surface 50a of the conductor unit 16 along the guide groove 56, and the end portions 20a and 20b are It is inserted deeply into the opening 51 of the connection terminal 24.

  Next, as shown in FIG. 9, in order to electrically connect the connection terminal 24 and the end portions 20a and 20b, the connection terminal 24 is crimped and heated by the tools 100 and 102. That is, the tool 100 can be easily brought into contact with the lower surface of the connection terminal 24 from below through the holes 42a and 42b, and the tool 102 can be brought into contact with the upper surface of the connection terminal from above. Thereafter, the connection terminal 24 is sandwiched by the tools 100 and 102, and the connection terminal 24 and the ends 20a and 20b can be electrically connected by crimping and heating. In FIG. 9, the main body 50 of the conductor unit 16 is not shown for easy understanding.

  The connection terminal 24 and the end portions 20a and 20b may have mechanical strength to connect the conductor unit 16 to the stator core 14. Even if the end portions 20a and 20b are thin and the mechanical strength is small, the stator core 14 and the conductor unit 16 are firmly fixed by the second recess 36 and the protrusion 52 and are prevented from being displaced, so that the connection terminal 24 and the ends 20a and 20b can be prevented from being loaded.

  As described above, according to the stator 10 of the rotating electrical machine according to the present embodiment, the conductor unit 16 is inserted into the stator core 14 from the axial direction and then rotated in the direction of the opening 51 of the connection terminal 24. Thus, the end portions 20a and 20b of the coil 12 are respectively mounted and assembled so as to be inserted into the opening 51. Therefore, the positioning and connection between the connection terminal 24 and the end portions 20a and 20b are easy. In addition, since the end portions 20a and 20b and the connection terminal 24 are directly connected, an intermediate terminal or the like is unnecessary and the number of parts is small.

  Furthermore, since the end portions 20a and 20b protrude in the radial direction and the conductor unit 16 is provided on the inner diameter side of the stator core 14, the axial height of the stator 10 can be set small.

  The stator 10 has been described as a star connection method having a neutral point, but may be a Δ connection method. In this case, the connection of the bus bars 58a to 58d in the conductor unit 16 may be a Δ connection. In addition, the end portions 20a and 20b and the connection terminal 24 have been described as having the same axial position at the height H1 from the first pedestal 28. For example, the heights of the end portions 20a and 20b are the same. Accordingly, the connection terminals 24 may be alternately set at two different heights.

  Further, in the stator 10 described above, the ends 20a and 20b of the coil 12 protrude toward the inner diameter side and protrude toward the outer diameter side so that the connection terminals 24 of the conductor unit 16 face each other. As described above, even if the end portions 21a and 21b protrude toward the outer diameter side and protrude toward the inner diameter side so that the connection terminal 24a of the conductor unit 16a faces, the same effect can be obtained.

  Further, as described above, the partition wall 40 of the stepped surface 32 in the stator core 14 acts as a retaining member for the conductor unit 16, but the protrusion 52 of the conductor unit 16 and the shallow second recess 36 of the stator core 14 are firmly engaged. In that case, the second recess 36 may be communicated to the upper surface and the partition 40 may be omitted. In this case, it is preferable to lengthen the protrusion 52 in accordance with the second recess 36.

  The guide groove 56 in the side surface 50a of the conductor unit 16 has an effect of guiding the ends 20a and 20b to the opening 51. However, when the opening 51 is relatively wide, the ends 20a and 20b are formed in the guide groove 56. May be omitted. Thereby, the side surface 50a becomes a smoother surface, and it is easy to manufacture the metal mold | die of the main body 50. FIG.

  Of course, the stator of the rotating electrical machine according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

It is a top view of the stator of the rotary electric machine which concerns on this Embodiment. It is a partially expanded perspective view of a stator core. It is a perspective view of a conductor unit. It is a partially expanded perspective view of a conductor unit. It is a partially expanded sectional view of a stator. It is a partially expanded plan view which shows the state which inserted and placed the conductor unit from the axial direction with respect to the stator core. It is a partially expanded plan view which shows the state which rotated the conductor unit clockwise with respect to the stator core. It is a partially expanded plan view which shows the state which made the conductor unit engage with the stator core. It is a partial expansion perspective view of the stator which shows the process of connecting a connection terminal and the edge part of a coil. It is a top view of the modification of the stator of the rotary electric machine which concerns on this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10a ... Stator 12 ... Coil 14 ... Stator core 16, 16a ... Conductor unit 18 ... Insulator 20a, 20b, 21a, 21b ... End part 22a, 22b, 22c ... Terminal 24, 24a ... Connection terminal 26 ... Base 28 ... First 1 pedestal 30 ... second pedestal 32 ... step surface 34 ... first recess 36 ... second recess 38, 40 ... partition walls 42a, 42b ... hole 50 ... main body 50a ... side 51 ... opening 52 ... projection 54 ... most advanced part 56 ... Guide groove 100, 102 ... Tool

Claims (4)

In a stator of a rotating electrical machine having a stator core in which a plurality of coils are annularly disposed and a conductor unit disposed coaxially with respect to the stator core,
The end of the coil protrudes in the radial direction of the stator core,
The conductor unit includes a plurality of connecting portions protruding in a radial direction facing the end portion and provided with openings in the circumferential direction.
The stator core includes an axial positioning portion that is in axial contact with the conductor unit and supports the conductor unit rotatably.
The stator core and the conductor unit have a rotation stop engaging portion for mutual rotation positioning,
The conductor unit is inserted into the axial positioning portion from the axial direction, and then rotated in the opening direction of the opening, thereby preventing the stator core and the conductor unit from rotating. The engagement portion is locked, the end portions are mounted so as to be inserted into the opening portions of the connection portions, respectively, and the connection portions and the end portions are electrically connected. A stator for rotating electrical machines. The stator of the rotating electrical machine according to claim 1,
The stator of a rotating electrical machine, wherein the stator core and the conductor unit have a retaining engagement portion that prevents axial displacement of each other. The stator of the rotating electrical machine according to claim 1,
The stator core has a hole portion through which a tool for electrically connecting the connection portion and the end portion can be inserted and communicated in the axial direction. The stator of the rotating electrical machine according to claim 1,
A stator for a rotating electrical machine, wherein a side surface of the conductor unit is provided with a guide groove for guiding the end portion to the opening when the conductor unit is mounted on the stator core.

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