JP2006187164A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine in which the height of a coil end can be lowered. <P>SOLUTION: The high-voltage rotary electric machine 100 is provided with a rotor 2 and a stator 1 oppositely arranged at radial outside of the rotor 2. The stator 1 is provided with a cylindrical stator core 12, and a stator winding 6 having coil ends 60A, 60B protruding from both end surfaces of axial direction of the stator core 12. The stator winding 6 has a plurality of phase widings, and each of the phase windings is formed by joining ends of a plurality of conductive segments 11 arranged along a dimensional direction in a slot formed in the stator core 12. One of the ends of phase wire forms a leading wire for a leading-out wire obtained by extending one conductive segment arranged in the outermost layer of the slot in an axial direction. Leading-out lead wires 131, 132 and 133 are arranged adjacently to radial outside of the leading-out wire for lead wire and joined, and extend in the stator core 12 side along the axial direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating electric machine such as an electric motor or a generator mounted on an automobile or the like.

A rotating electric machine such as an electric motor or a generator has a stator, and an electrical connection between the stator winding and another configuration is made by using a lead wire for the lead wire joined to the stator winding. Done. As for the lead wire lead wire joining method, the neutral point lead wire is drawn from a layer other than the outermost layer, and the lead wire lead wire is drawn from the outermost layer of the stator winding and from the outermost diameter of the coil end. A method of connecting to a terminal arranged inside (see, for example, Patent Document 1), a lead wire for neutral point connection is drawn from the outermost layer or the innermost layer, and the lead wire for the lead wire is connected to the middle layer of the stator winding There is known a method of extracting from (see, for example, Patent Document 2).
JP 2003-348780 A (page 3-9, FIG. 1-12) JP 2000-166149 A (page 3-5, FIG. 1-13)

  By the way, in the joining method of the lead wire for the lead wire disclosed in Patent Document 1, the lead wire for the lead wire crawls over the lead wire for the neutral point connection, so that the height of the coil end increases. There was a problem. In the lead wire lead wire joining method disclosed in Patent Document 2, since the lead wire lead wire is drawn from the middle layer of the stator winding, the lead wire lead wire crawls over the coil end. As a result, there is a problem that the height of the coil end becomes high.

  The present invention was created in view of the above points, and an object of the present invention is to provide a rotating electrical machine capable of reducing the coil end height.

  In order to solve the above-described problems, a rotating electrical machine according to the present invention includes a rotor and a stator disposed opposite to the outer side in the radial direction of the rotor, and the stator is a cylindrical stator core. And a stator winding having a coil end portion wound around the stator core and projecting from both axial end surfaces of the stator core, the stator winding having a plurality of phase windings, Each of the phase windings is formed by joining ends of a plurality of conductor segments arranged in the radial direction in a slot formed in the stator core, and the slot is formed by one end of the phase winding. A lead wire for the lead wire is formed by extending one conductor segment arranged in the outermost layer in the direction of the rotation axis of the rotor. , Extended to the stator core side along the rotation axis direction It has a lead wire out. In this way, since the lead wire for the lead wire arranged in the outermost layer and the lead wire for the lead arranged on the outer diameter side are joined, it is necessary to crawl the lead wire for the lead wire along the coil end portion. Therefore, the coil end height including these lead wires can be lowered by that amount.

  Further, it is desirable that the lead wire for lead wire and the lead wire for lead described above are joined at the end along the rotation axis direction. As a result, when the lead-out lead wire and the lead-out lead wire are joined, the joining position of these lead wires protrudes to the end portion, so that other lead wires that interfere with the joining work such as arc welding can be prevented. Therefore, workability can be improved.

  In the above-described lead lead wire, it is desirable that the axially extending portion approaching the coil end portion is covered with an insulating resin together with the coil end portion. Thereby, the lead wire can be fixed to the coil end portion together with the insulation of the joint portion, and disconnection due to vibration or the like can be prevented.

  Further, the above-described conductor segment includes a slot conductor portion accommodated in the slot, and the slot desirably accommodates eight slot conductor portions in a row in the radial direction. Thus, by accommodating a large number of slot conductor portions in a row in the radial direction, it becomes easy to increase the number of turns of each phase winding to constitute a high voltage driven rotating electrical machine. Further, when the eight slot conductor portions are accommodated in a line in the radial direction, the number of slots can be increased by narrowing the circumferential width of the slots, thereby increasing the number of turns and fixing of each phase winding. It becomes possible to increase the number of poles of the sub-windings, and it becomes even easier to configure a high voltage driven rotating electrical machine.

  Further, it is desirable that the above-described lead lead wire is constituted by a round wire. As a result, it is possible to cut these inexpensive lead wires to a predetermined length to form these lead wires.

  In addition, it is desirable that the above-described lead lead wire extends to the stator core side along the rotation axis direction, bends radially outward, and further bends in the rotation axis direction.

  Moreover, it is desirable to connect the other end portion of the above-described lead wire to the female terminal accommodated in the cluster block. By using the female terminals accommodated in the cluster block, it is possible to electrically connect these female terminals only by peeling off the insulating film at the end of each lead wire.

  Further, it is desirable that the other end of each of the plurality of phase windings described above forms a neutral point that is drawn in the direction of the rotation axis from the coil end portion where the lead wire for lead is formed and joined together. As a result, both the joint and neutral point of the lead-out lead wire and lead-out lead wire can be protruded from the coil end portion to the same side, and work such as joining and insulation processing can be performed simultaneously. As a result, the process can be simplified and the process can be simplified.

  Hereinafter, a high voltage rotating electrical machine according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an overall configuration of a high-voltage rotating electrical machine according to an embodiment. FIG. 2 is a side view of the stator. FIG. 3 is a perspective view of a conductor segment that forms part of the stator winding. FIG. 4 is a partial cross-sectional view showing a state in which conductor segments are accommodated in slots provided in the stator core.

  As shown in FIG. 1, the high-voltage rotating electrical machine 100 according to the present embodiment includes a stator 1, a rotor 2, a front bearing 3, a rear bearing 4, a frame 5, and a cluster block 13. The high-voltage rotating electrical machine 100 is used, for example, for driving a passenger car, a home compressor, and the like.

  The stator 1 includes a cylindrical stator core 12, a plurality of types of conductor segments 11 that constitute the stator winding 6, and an insulator 8 that electrically insulates between the stator core 12 and each conductor segment 11. I have. The stator core 12 is formed as a laminated core formed by stacking a plurality of laminated steel plates having a predetermined thickness. The insulator 8 is a resin sheet having electrical insulation. The stator winding 6 is a three-phase stator winding in which, for example, a three-phase phase winding is Y-connected. The stator winding 6 is supplied with power from, for example, an external three-phase inverter control circuit (not shown).

  The rotor 2 is disposed opposite to the inner side of the stator 1, and a permanent magnet is incorporated therein. A shaft (rotating shaft) 7 of the rotor 2 is rotatably supported by a front bearing 3 and a rear bearing 4. The frame 5 accommodates the front bearing 3 and the rear bearing 4.

  The cluster block 13 is a terminal case that incorporates three connection terminals connected to the ends of three lead wires 131, 132, and 133 that are drawn from each phase of the stator winding 6. An external three-phase inverter control circuit is connected to these connection terminals. These three connection terminals are female terminals and accommodate the ends of the three lead wires 131, 132, and 133. By using the female terminals, it is possible to electrically connect these female terminals only by peeling off the insulating films at the ends of the three lead wires 131, 132, and 133.

  As shown in FIG. 3, the above-described stator winding 6 includes a conductor segment 11 having a predetermined shape inserted into each slot of the stator core 12 from one axial end face side of the stator core 12, and each conductor from the slot. The protruding end portion of the segment 11 is protruded to the other axial end face side of the stator core 12 by a necessary length, and the protruding end portion of each conductor segment 11 is twisted in the circumferential direction by an electrical angle of approximately π / 2. Each conductor segment 11 is constructed by welding the protruding end portions (joining portions) of the protruding end portions in a predetermined combination. The conductor segment 11 has a substantially U-shaped or substantially V-shaped shape covered with a resin film (insulating film) except for the welded portion, that is, the tip end portion of the protruding end portion (also referred to as the end tip portion). ing.

  In addition, as shown in FIGS. 1-4, in the stator winding | coil 6 of this embodiment, the segment set S1 which consists of four conductors arrange | positioned at the inner peripheral side has the structure which combined the large and small conductor segments 11. As shown in FIG. Similarly, a segment set S2 composed of four conductors arranged on the outer peripheral side has a structure in which large and small conductor segments 11 are combined.

  Next, the details of one segment set S1 composed of two conductor segments 11 will be described in more detail. The segment set S1 includes a head portion as a substantially V-shaped turn portion, a pair of slot conductor portions that extend linearly from both ends of the head portion and are accommodated in slots, and from the tip ends of both slot conductor portions. It consists of two conductor segments 11 each having a pair of extending protruding ends. Of these two conductor segments 11, the smaller one is referred to as a small segment 112, and the larger one surrounding the small segment 112 is referred to as a large segment 111. In addition, in the state before inserting in each slot 15 of the stator core 12, the protrusion end part is not formed, but the part corresponding to a slot conductor part and a protrusion end part forms the linear part.

  The stator winding 6 includes a first coil end portion (head side coil end portion) 60 </ b> A that exists in a ring shape as a whole on one axial end surface side of the stator core 12, and the other stator core 12. It is divided into a second coil end portion (end portion side coil end portion) 60B that exists in a ring shape as a whole on the axial end face side, and a slot conductor portion that exists in the slot. That is, in FIG. 1, the head-side coil end 60 </ b> A is configured by the head of each conductor segment 11, and the end-side coil end 60 </ b> B is configured by the protruding end of each conductor segment 11.

  The large segment 111 has slot conductor portions 111a and 111b, a head portion 111c, and protruding end portions 111f and 111g. Since the tip end portions 111d and 111e of the protruding end portions 111f and 111g are joint portions, they are also referred to as end tip portions or joint portions.

  The small segment 112 has slot conductor portions 112a and 112b, a head portion 112c, and protruding end portions 112f and 112g. Since the leading end portions 112d and 112e of the protruding end portions 112f and 112g are joint portions, they are also referred to as end tip portions or joint portions.

  The symbol “′” indicates the same portion as the portion without the symbol “′” of the large segment 111 or the small segment 112 (not shown). Therefore, in FIG. 3, the joint 112d and the joint 111d 'that are adjacent to each other in the radial direction are welded, and the joint 112e and the joint 111e' that are adjacent to each other in the radial direction are welded.

  In FIG. 3, when the slot conductor portion 111 a in the innermost layer and the slot conductor portion 112 a in the middle inner layer are accommodated in one slot of the stator core 12, the slot conductor portions in the outermost layer of the same large segment 111 and small segment 112. 111b and the slot conductor portions 112b in the middle and outer layers are accommodated in other slots separated from the one slot by a predetermined odd-numbered magnetic pole pitch T (for example, one magnetic pole pitch (electrical angle π)). The head 112c of the small segment 112 is disposed so as to be surrounded by the head 111c of the large segment 111.

  The arrangement state of the segments in each slot 15 of the stator core 12 will be described with reference to FIG. Eight conductor housing positions P1 to P8 are set in each slot 15 along the radial direction, and one slot conductor portion is housed in each of the conductor housing positions P1 to P8. Each slot 15 accommodates two segment sets S1 and S2 in order in the radial direction, the conductor accommodation positions P1 to P4 accommodate the segment set S1, and the conductor accommodation positions P5 to P8 accommodate the segment set S2.

  The innermost-layer segment set S1 will be described in detail as an example. The innermost slot conductor portion 111a is disposed on the radially innermost side of the slot 15 of the stator core 12, and hereinafter, in the radially inner side, The slot conductor portion 112a, the middle and outer layer slot conductor portions 112b ′, and the outermost layer slot conductor portion 111b ′ are arranged in this order. Eventually, each slot 15 accommodates four slot conductor portions in one row of four layers. In FIG. 4, the slot conductor portions 111 b ′ and 112 b ′ belong to a large segment 111 and a small segment 112 that are different from the large segment 111 and the small segment 112 having the slot conductor portions 111 a and 112 a. The other segment set S2 has basically the same structure as the segment set S1.

  Next, the connection between the stator winding 6 and the cluster block 13 will be described. FIG. 5 is a plan view of the stator 1. FIG. 6 is a partial side view of the stator winding 6. As shown in FIG. 5, the stator winding 6 has lead wire lead wires 61, 62, 63 serving as one ends of three types of phase windings U, V, W. These three lead wires 61, 62, 63 for the lead wires protrude from the outermost layer in the slot 15 along the axial direction (parallel to the shaft 7) from the head side coil end portion 60A toward the rear side. Yes.

  Further, as shown in FIGS. 2 and 5, the lead wires 131, 132, 133 drawn from the cluster block 13 extend while meandering along the axial direction (131A, 132A, 133A), and then in the radial direction. It is bent inward to reach the outer periphery of the head side coil end portion 60A (131B, 132B, 133B), and extends to the positions of the lead wire lead lines 61, 62, 63 along the outer periphery of the head side coil end portion 60A. (131C, 132C, 133C), and further bent in the axial direction so as to be parallel to the lead wire 61, 62, 63 (131D, 132D, 133D). Accordingly, the lead wire 61 for the lead wire and the end portion 131D of the lead wire 131 are arranged at positions adjacent to each other in the radial direction, and the rear side end portions of these two conductors are joined by welding. A portion 151 is formed. Similarly, the lead wire lead wire 62 and the end portion 132D of the lead wire 132 are disposed at positions adjacent to each other in the radial direction, and the rear side end portions of these two conductors are joined by welding. A joining portion 152 is formed. The lead wire lead wire 63 and the end portion 133D of the lead wire 133 are arranged at positions adjacent to each other in the radial direction, and the rear side end portions of these two conductors are joined by welding to join the joint portion 153. Is forming. Further, the three lead wires 131, 132, 133 are configured using round wires (conductive wires having a circular cross section). As a result, it is possible to cut these inexpensive lead wires to a predetermined length to form these three lead wires 131, 132, 133.

  Further, a predetermined region on the rear side of the head side coil end portion 60 </ b> A including these three sets of welds is covered with an insulating resin 14. Thus, by pulling out the lead wires 131, 132, 133 from the end portions 131D, 132D, 133D to the stator core 12 side, the neutral point 16 and the joint portions 151, 152, 153, The lead wires 131, 132, 133 and the close contact portions of the conductor segments 11 are covered with the insulating resin 14 at a time, and the insulation of the joints 151, 152, 153 and the fixing of the lead wires 131, 132, 133 are simultaneously performed. It is possible to reduce the work time. The insulating resin 14 can be formed, for example, by attaching an epoxy powder resin and then thermosetting it. Specifically, the stator 1 as a whole is heated and immersed in a flowed powder resin, and after the powder resin is adhered, it is thermally cured, so that the necessary portion (as shown in FIG. 2) The insulating resin 14 is formed on the part side coil end part 60A and a part of the end part side coil end part 60B. In this embodiment, the neutral point 16 where the other ends of the three types of phase windings U, V, W are connected to each other is a layer other than the outermost layer and the innermost layer in the slot 15 (see FIG. 5). In the example shown, it is drawn from the second layer from the inner layer side).

  Thus, in the high voltage rotating electrical machine 100 of the present embodiment, the lead wire lead wires 61, 62, 63 arranged in the outermost layer of the stator winding 6 and the lead wire 131 arranged on the outer diameter side thereof. , 132 and 133 are joined together, and it is not necessary to crawl these lead-out lead wires 131, 132 and 133 along the head-side coil end portion 60A, and include these lead wires accordingly. The coil end height can be lowered.

  Further, the lead wire lead wires 61, 62, 63 and the lead lead wires 131, 132, 133 are joined at the end portions along the rotation axis direction, so that the lead wire lead wires 61, 62, 63 and the lead wires are joined. When joining the wires 131, 132, and 133, the joining positions of these lead wires protrude from the end portions. Therefore, there are no other lead wires or the like that interfere with the joining work such as arc welding, and workability can be improved.

  Further, in the lead wires 131, 132, and 133, the axially extending portions 131D, 132D, and 133D that approach the head side coil end portion 60A are covered with the insulating resin 14 together with the head side coil end portion 60A. The lead wires 131, 132, and 133 can be fixed to the head side coil end portion 60A together with the insulation of the joint portions 151, 152, and 153, and disconnection due to vibration or the like can be prevented. Further, both the joints 151, 152, 153 and the neutral point 16 can be protruded from the head side coil end part 60A to the same side, so that work such as joining and insulation treatment can be performed at the same time. As a result, the process can be simplified.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. In the above-described embodiment, the example in which the insulating resin 14 is formed by thermosetting after adhering the powder resin by fluid immersion has been described. However, the thermosetting is performed after the liquid material such as liquid epoxy is adhered by dropping or spraying. You may make it make it.

  In the above-described embodiment, the stator winding 6 in which the two segment sets composed of the two large and small conductor segments 11 are arranged in the radial direction in the slot 15 of the stator core 12 has been described. The number of segment sets may be 1 or 3 or more. Moreover, you may make it comprise a segment set using one type of conductor segments, or using three or more types of conductor segments.

  In the above-described embodiment, a high-voltage rotating electric machine, that is, a rotating electric machine as a motor used for driving a passenger car, a home compressor, and the like has been described. However, the stator 1 and the lead wires 131, 132, 133 are described. This connection structure may be applied to a rotating electrical machine as a generator.

It is sectional drawing which shows the whole structure of the rotary electric machine for high voltages of one Embodiment. It is a side view of a stator. It is a perspective view of the conductor segment which makes a part of stator winding. It is a fragmentary sectional view which shows the accommodation state of the conductor segment in the slot provided in the stator core. It is a top view of a stator. It is a partial side view of a stator winding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 3 Front bearing 4 Rear bearing 5 Frame 11 Conductor segment 12 Stator core 13 Cluster block 14 Insulating resin 15 Slot 61, 62, 63 Lead wire for lead wire 100 High voltage rotating electrical machine 131, 132, 133 Lead Lead

Claims (8)

In a rotating electrical machine comprising a rotor and a stator disposed opposite to the outer side in the radial direction of the rotor,
The stator includes a cylindrical stator core, and a stator winding having coil end portions wound around the stator core and projecting from both axial end surfaces of the stator core,
The stator winding has a plurality of phase windings, and each of the plurality of phase windings is a plurality of substantially U-shaped or radially arranged in a slot formed in the stator core or Formed by joining the ends of substantially V-shaped conductor segments,
One end of the phase winding forms a lead wire for a lead wire extending in the direction of the rotation axis of the rotor through one conductor segment disposed in the outermost layer in the slot,
A rotating electrical machine comprising: a lead wire extending adjacent to and radially outside the lead wire for the lead wire and extending toward the stator core along the rotation axis direction. In claim 1,
The rotating electrical machine characterized in that the lead wire for the lead wire and the lead wire for the lead wire are joined at an end portion along the rotation axis direction. In claim 1 or 2,
The rotating electrical machine characterized in that the lead-out lead wire is covered with an insulating resin together with the coil end portion in an axially extending portion approaching the coil end portion. In any one of Claims 1-3,
The conductor segment includes a slot conductor portion accommodated in the slot;
The slot machine accommodates eight slot conductor portions in a row in a radial direction. The rotating electrical machine according to any one of claims 1 to 4, wherein the lead wire is a round wire. The lead wire according to any one of claims 1 to 5, wherein the lead wire extends toward the stator core along the rotation axis direction, and is then bent radially outward and further bent in the rotation axis direction. A rotating electric machine that is characterized. The rotating electrical machine according to any one of claims 1 to 6, wherein the other end of the lead wire is connected to a female terminal accommodated in the cluster block. In any one of Claims 1-7,
The other end of each of the plurality of phase windings forms a neutral point that is pulled out in the direction of the rotation axis from the coil end portion where the lead-out lead wire is formed and joined to each other. Rotating electric machine.

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