JP4587470B2 - Centralized power distribution member of motor - Google Patents

Description

  The present invention relates to a central power distribution member of a motor.

Patent Document 1 discloses a technique that uses a concentrated power distribution member as means for supplying electric power to a stator winding constituting a motor. This concentrated power distribution member is formed by arranging a plurality of holding grooves in a radial direction on a ring-shaped insulating holder, and a bus bar is assembled in each holding groove in the axial direction. Further, a power feeding terminal that protrudes in the axial direction outside the holding groove and a tab for connecting the winding are provided that also protrude in the axial direction outside the holding groove.
JP 2003-134759 A

In the conventional concentrated power distribution member, in order to reduce the dimension in the axial direction, the terminal protruding in the axial direction is bent outward in the radial direction, and the tab protruding in the axial direction is bent inward in the radial direction.
Therefore, for example, when the bus bar is attached to the holding groove located on the inner side after attaching the bus bar to the holding groove located on the outer peripheral side, the inner peripheral side bus bar is connected to the outer peripheral side bus bar. Since it interferes with the tab bent radially inward, it is difficult to assemble it into the holding groove, and an improvement has been desired.
The present invention has been completed based on the above circumstances, and an object thereof is to facilitate the work of assembling a bus bar with respect to the holding grooves arranged in the radial direction.

As a means for achieving the above object, the invention of claim 1 is for supplying electric power to the windings of the stator constituting the motor, and the ring-shaped insulating holder is provided in the circumferential direction. A plurality of extending holding grooves are formed so as to be stacked in the radial direction, and a bus bar is accommodated in the plurality of holding grooves by being assembled in the axial direction. The bus bar is axially moved out of the holding groove in the axial direction. Are provided with a power feeding terminal that is bent in the radial direction and is protruded in the axial direction and is bent in the radial direction outside the holding groove, and a tab for connecting the winding is provided. The bending direction in the radial direction of the terminal and the bending direction in the radial direction of the tab are the same, and at least one of the plurality of holding grooves stacked in the radial direction is provided. Holding groove , Is a plurality of divided form in the circumferential direction, it said split into split retaining groove in the circumferential direction was the bus bar is accommodated, the said tab fold-back portion formed by folding the peripheral direction is formed The folded portion includes a receiving plate portion extending radially outward, an arc-shaped plate portion extending in a substantially arc shape from one end edge in the circumferential direction of the receiving plate portion, and an extension of the arc-shaped plate portion. A holding plate portion extending from the leading end so as to be folded back substantially in parallel with the receiving plate portion. When the winding oriented in the radial direction is inserted into the hollow of the arc-shaped plate portion, the holding plate portion is sandwiched between the folding portions. It is characterized in that it is connected in a connected state .

<Invention of Claim 1>
Since the terminals and tabs are bent in the same direction, if the bus bars are assembled in order from the holding groove located on the same side as the bending direction, the terminals and tabs of the bus bar assembled earlier will interfere with the bus bar to be assembled later. You do n’t have to. Therefore, the work of assembling the bus bar can be easily performed.
The bus bar assembled in the holding groove divided in the circumferential direction also has a substantially arcuate shape divided in the circumferential direction. Compared with a ring in which the holding groove and the bus bar are continuous over the entire circumference, the alignment of the bus bar with respect to the holding groove is facilitated, so that the assembly workability is good.
Further, since the winding is sandwiched between the folded portions of the tab, the winding can be reliably positioned with respect to the tab.

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. The motor including the central power distribution member D of the present embodiment is mounted on a hybrid electric vehicle, and is disposed in a narrow space between an engine (not shown) and a transmission (not shown), and the engine level. A rotor R connected coaxially to a crankshaft (not shown) and a ring-shaped stator S surrounding the rotor R are configured. The stator S includes a concentrated power distribution member D having an annular shape concentric with the rotor R, and twelve magnetic poles M formed by applying a winding W to a core (not shown). The twelve magnetic poles M are arranged at a constant pitch along a circumference concentric with the rotor R (the inner circumference of the concentrated power distribution member D), and both ends of the winding W are radially outward from each magnetic pole M. It is led out to the (centralized power distribution member D side). As shown in FIG. 1, the magnetic poles M are arranged in the order of U1, V1, W1, U2, V2, W2, U3, V3, W3, U4, V4, and W4 in the counterclockwise direction.

The central power distribution member D is for supplying electric power to the winding W, and is made of a synthetic resin toroidal insulating holder 10, a plurality of bus bars 12a, 12b, 12c and 12d, and a synthetic resin housing. 21.
The insulating holder 10 is formed with a plurality of holding grooves 11a, 11b, 11c, and 11d that are open to the front as viewed in the axial direction and that extend in the circumferential direction so as to be laminated in four layers in the radial direction. A first holding groove 11a having an arc shape is formed in the first outermost layer. In the second layer second from the outside, four second holding grooves 11b having an arc shape are formed in a form divided in the circumferential direction. In the third layer third from the outside, three third holding grooves 11c having an arc shape are formed in a form divided in the circumferential direction. In the innermost fourth layer, three fourth holding grooves 11d having an arc shape are formed in a form divided in the circumferential direction.

  In each of the holding grooves 11a, 11b, 11c, and 11d, first to fourth bus bars 12d12a, 12b, 12c, and 12d having a circular arc shape as a whole are accommodated by being assembled from the front (= in the axial direction). Yes. The bus bars 12a, 12b, 12c, and 12d are formed by bending a metal plate material that has been punched into a predetermined shape, and as a whole, has a strip shape with the plate surface as a peripheral surface. At the front edges of the bus bars 12a, 12b, 12c, and 12d, the bus bars 12a, 12b, 12c, and 12d are accommodated in the holding grooves 11a, 11b, 11c, and 11d. A terminal 13 that protrudes and a tab that protrudes forward out of the holding grooves 11a, 11b, 11c, and 11d in a state where the bus bars 12a, 12b, 12c, and 12d are accommodated in the holding grooves 11a, 11b, 11c, and 11d. Of these, at least the tab 18 is integrally formed.

The 1st bus-bar 12a accommodated in the 1st holding groove 11a becomes a form which formed the tab 18 for W phases in the both ends.
Of the four second bus bars 12b accommodated in the second holding groove 11b, one second bus bar 12b forms two U-phase tabs 18 at both ends and one U-phase terminal 13u. It is a form. Another second bus bar 12b has a form in which U-phase tabs 18 are formed at both ends. The remaining two second bus bars 12b are formed in such a manner that neutral point tabs 18 corresponding to the U, V, and W phases are formed at the three ends of both ends and the center.
Of the three third bus bars 12c accommodated in the third holding groove 11c, one third bus bar 12c is formed with V-phase tabs 18 at both ends and one V-phase terminal 13v. It is. Another third bus bar 12c has a form in which U-phase tabs 18 are formed at both ends, and the remaining third bus bar 12c has a form in which V-phase tabs 18 are formed at both ends.
Of the three fourth bus bars 12d accommodated in the fourth holding groove 11d, one fourth bus bar 12d forms two W-phase tabs 18 at both ends and one W-phase terminal 13w. It is a form. Another fourth bus bar 12d has a form in which W-phase tabs 18 are formed at both ends, and the remaining fourth bus bar 12d has a form in which V-phase tabs 18 are formed at both ends.

  The terminal 13 includes a plate-like base portion 14 that extends forward (parallel to the axial direction of the insulating holder 10) from the front edges of the bus bars 12a, 12b, 12c, and 12d, and an extension end of the base portion 14 A plate-like bent portion 15 extending substantially perpendicularly to the outside in the radial direction, and a plate-like support portion 16 extending from the extending end of the bent portion 15 to the opposite side (front) of the base portion 14 at a substantially right angle; It is composed of a round bar-like connection pin 17 fixed to the support portion 16 by cold pressure welding or the like. The connection pin 17 protrudes radially outward from the plate surface of the support portion 16. Thus, the connection pin 17 has a form that protrudes radially outward from the bus bars 12a, 12b, 12c, and 12d.

  The tab 18 has a plate-like rising portion 19 that extends forward from the front edges of the bus bars 12 a, 12 b, 12 c, and 12 d in a flush manner (parallel to the axial direction of the insulating holder 10), and an extension of the rising portion 19. And a folded portion 20 connected to the end. The folded portion 20 includes a receiving plate portion 20a that extends radially outward from the extending end of the rising portion 19 at a substantially right angle, and an arc shape that extends in a substantially arc shape from one end edge in the circumferential direction of the receiving plate portion 20a. It consists of a plate portion 20b and a pressing plate portion 20c extending from the extending end of the arc-shaped plate portion 20b so as to be folded back substantially parallel to the receiving plate portion 20a. The arc-shaped plate portion 20b and the receiving plate portion 20a are connected substantially at right angles, whereas the arc-shaped plate portion 20b and the holding plate portion 20c are connected smoothly and tangentially. Similar to the terminal 13, the folded portion 20 of the tab 18 has a shape protruding outward in the radial direction from the bus bars 12 a, 12 b, 12 c, and 12 d.

Next, a procedure for assembling the concentrated power distribution member D will be described.
First, the first bus bar is inserted into the first holding groove 11a located on the outermost side (that is, the same side as the direction in which the terminals 13u, 13v, 13w and the tab 18 protrude from the bus bars 12a, 12b, 12c, 12d). 12a is assembled and accommodated from the front. In the state in which the first bus bar 12a is accommodated, as shown in FIG. 3, the terminals 13 and the tabs 18 of the first bus bar 12a are located on the outside of the first holding groove 11a in the radial direction outside the first holding groove 11a. Therefore, it does not straddle the openings of the second to fourth holding grooves 11b to 11d located on the radially inner side of the first holding groove 11a.

  Next, the second bus bar 12b is assembled to the second holding groove 11b. At this time, as shown in FIG. 3, the opening of the second holding groove 11b is opened over the entire region. Therefore, the tab 18 of the assembled first bus bar 12a does not interfere with the second bus bar 12b, and the second bus bar 12b can be assembled without any trouble. Further, after the assembly, as shown in FIG. 4, the terminal 13u and the tab 18 of the second bus bar 12b are positioned so as to correspond to the first holding groove 11a radially outward from the second holding groove 11b. However, since the first bus bar 12a is already assembled in the first holding groove 11a, the terminal 13u and the tab 18 of the second bus bar 12b do not affect the first bus bar 12a.

  After this, the third bus bar 12c is assembled to the third holding groove 11c. However, the tab 18 of the first bus bar 12a and the terminal 13u and the tab 18 of the second bus bar 12b do not correspond to the opening of the third holding groove 11c. Therefore, the assembly of the third bus bar 12c is not hindered. Finally, the fourth bus bar 12d is assembled into the fourth holding groove 11d. When the fourth bus bar 12d is assembled, the terminals 13u of the first to third bus bars 12a to 12c are also assembled for the same reason as described above. , 13v and the tab 18 do not interfere with the fourth bus bar 12d.

  In the state where the assembly of all the bus bars 12a, 12b, 12c, and 12d is completed, the tabs 18 that form a pair of the same phase with respect to each magnetic pole M are arranged. Each pair of tabs 18 is connected to both ends of the winding W of the corresponding magnetic pole M. At the time of connection, the end portion of the winding W is inserted into the hollow of the arcuate plate portion 20 b and is sandwiched between the folded portions 20. As a result, the end of the winding W is positioned with respect to the tab 18, and thereafter, the winding W and the tab 18 are fixed so as to be conductive by a fusing process or the like.

  The three terminals 13u, 13v, 13w of the second to fourth bus bars 12b to 12d are arranged so as to be adjacent to each other in the circumferential direction between the tab 18 of the U2 phase and the tab 18 of the W4. The connection pins 17 of 13u, 13v, and 13w are arranged in a stacked manner (arrangement that forms a regular triangle when the connection pins 17 are connected). The three connection pins 17 are accommodated in a circular housing 21 made of synthetic resin after the bus bars 12a, 12b, 12c, and 12d are assembled to the insulating holder 10. As the means, there are a method of assembling the molded housing 21 to the connection pin 17 and a method of integrating the housing 21 with the connection pin 17 while molding the housing 21 by molding. A waterproof seal ring 22 is attached to the outer periphery of the housing 21. The insulating holder 10 and the tab 18 are surrounded by a mold member 23 having a ring shape concentric with the insulating holder 10, and the bus bars 12 a, 12 b, 12 c, and 12 d are embedded in the mold member 23.

As described above, in the present embodiment, since the terminals 13u, 13v, 13w and the tab 18 are bent in the same direction, the holding grooves 11a, 11b, 11c, 11d located in the same radial outer side as the bending direction are sequentially arranged. If the bus bars 12a, 12b, 12c, and 12d are assembled, the terminals 13u, 13v and the tabs 18 of the bus bars 12a, 12b, and 12c that are assembled in advance do not interfere with the bus bars 12b, 12c, and 12d that are assembled later. . Therefore, the assembly work of the bus bars 12a, 12b, 12c, and 12d can be easily performed.
Further, among the first to fourth holding grooves 11a, 11b, 11c, and 11d stacked in the radial direction, the holding grooves 11b to 11d of the second to fourth three (at least one) layers are provided. The second to fourth bus bars 12b to 12d assembled in the second to fourth holding grooves 11b to 11d divided in the circumferential direction are also formed in the circumferential direction. It has a substantially arcuate shape divided. In this embodiment, the peripheral lengths of the second to fourth holding grooves 11b to 11d and the second to fourth bus bars 12b to 12d are compared with those in which the holding grooves and the bus bars are formed in a ring shape that is continuous over the entire circumference. Since the length is shortened, the alignment of the bus bars 12b to 12d with respect to the holding grooves 11b to 11d is facilitated, and the assembly workability is good.
Further, the folded portion 20 is formed on the tab 18, and the end portion of the winding W is connected so as to be sandwiched between the folded portions 20, so that the winding W is reliably positioned with respect to the tab 18. And can be easily connected.

<Other embodiments>
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the holding groove and the bus bar are formed in an arc shape in all the layers. However, according to the present invention, the holding groove and the bus bar may be formed in a ring shape continuous over the entire circumference in at least one layer. .
(2) In the above embodiment, the case where the insulating holder is circular has been described. However, according to the present invention, the insulating holder may be polygonal. In this case, the holding groove and the bus bar can also be bent along the polygon.
(3) In the above embodiment, the number of stacks in the radial direction of the holding grooves and the bus bars is four. However, according to the present invention, the number of stacks may be three or five or more.
(4) In the above embodiment, the terminal and the tab are bent radially outward. However, according to the present invention, the terminal and the tab may be bent radially inward.
(5) Although the case where the number of magnetic poles is 12 has been described in the above embodiment, the present invention can be applied to other than 12 poles.

Front view of Embodiment 1 Partial enlarged front view showing the state before installing the bus bar Partial enlarged front view showing a state where the first bus bar is assembled to the first holding groove. Partial enlarged front view showing a state in which the first and second bus bars are assembled to the first and second holding grooves. Partial enlarged front view showing a state in which the first to third bus bars are assembled to the first to third holding grooves. Partial enlarged front view showing a state where bus bars are assembled in all holding grooves Partial enlarged plan view of the connector Partial enlarged side view of connector XX sectional view of FIG.

Explanation of symbols

D ... Concentrated power distribution member S ... Stator W ... Winding 10 ... Insulating holder 11a ... First holding groove 11b ... Second holding groove 11c ... Third holding groove 11d ... Fourth holding groove 12a ... First bus bar 12b ... Second bus bar 12c ... 3rd bus bar 12d ... 4th bus bar 13u, 13v, 13w ... Terminal 18 ... Tab 20 ... Folding part

Claims (1)

For supplying electric power to the stator windings constituting the motor,
The insulating holder having a ring shape is formed with an arrangement in which a plurality of holding grooves extending in the circumferential direction are stacked in the radial direction,
In the plurality of holding grooves, a bus bar is accommodated by assembling in the axial direction,
The bus bar has a power feeding terminal that protrudes axially outward from the holding groove and is bent in a radial direction, and has a form that protrudes axially outward from the holding groove and is bent in a radial direction. In what is provided with a tab for connecting wires,
The bending direction in the radial direction of the terminal and the bending direction in the radial direction of the tab are the same direction,
The holding groove of at least one layer among the plurality of holding grooves stacked in the radial direction is configured to be divided into a plurality in the circumferential direction,
The bus bar divided in the circumferential direction is accommodated in the divided holding grooves ,
The tab is formed with a folded portion that is folded in the circumferential direction,
The folded portion includes a receiving plate portion extending radially outward, an arc-shaped plate portion extending in a substantially arc shape from one end edge in the circumferential direction of the receiving plate portion, and an extending end of the arc-shaped plate portion And a holding plate portion extending so as to be folded back substantially in parallel with the receiving plate portion,
A concentrated power distribution member for a motor, wherein the windings directed in the radial direction are connected in a state of being sandwiched between the folded portions when inserted into the hollow of the arc-shaped plate portion .

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