JP5365862B2 - Armature for rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable size reduction and efficiency improvement in a rotating electrical machine, at low cost. <P>SOLUTION: An armature for rotating electrical machines includes a substantially cylindrical core 11, having multiple slots 12 dispersedly arranged in the circumferential direction, coils 21 in multiple phases wound in the slots 12; and a connecting conductor 41, that connects together the ends of the coils 21 in the multiple phases so that they are star-connected. The coil 21 in each phase has two component coils connected in parallel. Neutral ends 24, i.e., the ends of each two component coils on the neutral point side, are arranged along the direction of the radius of the core. With respect to each phase, the two neutral ends 24 arranged along the direction of the radius of the core are respectively connected to the connecting conductor 41 so that the connecting conductor 41 is sandwiched between both sides in the direction of the radius of the core. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an armature for a rotating electrical machine in which a plurality of phase coils are connected in parallel, and the plurality of phase coils are star-connected to each other.

  Each of the two constituent coils is configured to be connected in parallel, and includes a multi-phase coil wound around a substantially cylindrical core, and a connection conductor that connects the multi-phase coils so as to be star-connected to each other. 2. Description of the Related Art Armatures for rotating electrical machines are conventionally known. For example, the following Patent Document 1 discloses a three-phase coil of a U-phase coil, a V-phase coil, and a W-phase coil, and a neutral point connection fitting as a connection conductor that connects these three-phase coils so as to be star-connected to each other. And a stator having a first coil portion and a second coil portion in which coils of each phase are connected in parallel. In the stator for a rotating electrical machine described in Patent Document 1, the first coil portion and the second coil portion of each phase that are connected in parallel are arranged at different positions in the circumferential direction while being shifted by a predetermined phase. Yes.

JP 2005-130667 A

  Therefore, in the stator for a rotating electrical machine described in Patent Document 1, the first coil portion and the second coil portion of each phase are different in the circumferential direction even if the connection terminals of the respective phase coils are relatively closely arranged. The neutral point connection metal fitting is connected at a position, and as a result, the circumferential length of the neutral point connection metal must be increased. For this reason, there has been a problem in that the size of the stator for a rotating electrical machine, and hence the entire rotating electrical machine, is increased. In addition, the number of joints between the neutral point fittings and the respective phase coils in the circumferential direction is increased, resulting in a problem that work efficiency is reduced and costs are increased.

  Moreover, since the edge part of the 1st coil part of each phase and the edge part of the 2nd coil part are connected to a neutral point connection metal fitting in the position where circumferential directions differ, it is 1st according to the electrical resistance of a neutral point connection metal fitting. There may be a potential difference between one end of the coil part and one end of the second coil part. When such a potential difference occurs, an internal current (so-called circulating current) flows from the coil portion having a high potential toward the coil portion having a low potential. As a result, there is a problem in that copper loss (loss due to Joule heat) due to the circulating current occurs, leading to a reduction in the efficiency of the rotating electrical machine.

  Therefore, each of the two constituent coils is connected in parallel, and a multi-phase coil wound around a substantially cylindrical core, and a connection conductor for connecting the multi-phase coils so as to be star-connected to each other, In the armature for a rotating electrical machine provided, it is desired to realize a technology that can reduce the size and improve the efficiency of the rotating electrical machine at low cost.

  According to the present invention, a substantially cylindrical core having a plurality of slots distributed in the circumferential direction, a plurality of coils wound around the slots, and end portions of the plurality of coils are star-connected to each other. In this way, the characteristic configuration of the armature for a rotating electrical machine having the connecting conductors connected as described above is such that the coils of each phase have two constituent coils connected in parallel, and neutral points of the two constituent coils. The neutral ends, which are the side ends, are arranged side by side in the core radial direction, and for each phase, the two neutral ends arranged side by side in the core radial direction sandwich the connection conductor from both sides in the core radial direction. In this state, each is connected to the connection conductor.

In the present application, the “core radial direction” means a radial direction defined on the basis of a cylindrical core. Similarly, the directions of “circumferential direction” and “axial direction” also mean directions defined on the basis of a cylindrical core. At this time, the direction of each phase coil and connection conductor is defined as the direction in which each phase coil is wound around the slot and the connection conductor is connected to each phase coil. .
The “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that performs both functions of the motor and the generator as necessary.

  According to the above characteristic configuration, since the two constituent coils of each phase connected in parallel are connected to the connection conductor in a state where the neutral ends are arranged in the core radial direction, the circumferential length of the connection conductor is reduced. It can be kept short. Therefore, it is possible to reduce the size of the armature for a rotating electrical machine, and thus the entire rotating electrical machine. Also, since the two neutral ends of each phase are connected to the connection conductor with the connection conductor sandwiched from both sides in the core radial direction, the two neutral ends of each phase coil are connected to the connection conductor. It can be done in one place in the direction. Therefore, the number of joint portions between the connection conductor and each phase coil in the circumferential direction as a whole can be reduced. As a result, work efficiency can be improved and costs can be reduced.

  In addition, since the neutral ends of the two constituent coils of each phase are connected to the connecting conductor on both sides of the connecting conductor in the core radial direction, the distance between the two neutral ends is set in the core radial direction of the connecting conductor. Can be as short as the width. Therefore, it is possible to effectively suppress the occurrence of a potential difference between the neutral ends of the two constituent coils of each phase, and it is possible to suppress the circulation current from flowing between them. As a result, the occurrence of copper loss due to the circulating current can be suppressed, and the energy efficiency of the rotating electrical machine can be improved.

  Therefore, according to the above-described characteristic configuration, each of the two constituent coils is connected in parallel, and a plurality of coils wound around a substantially cylindrical core and the plurality of coils are star-connected to each other. In the armature for a rotating electrical machine provided with a connecting conductor connected to the rotating electrical machine, it is possible to reduce the size and improve the efficiency of the rotating electrical machine at low cost.

  Here, the constituent coil of each phase has two coil side portions arranged in two slots having different circumferential positions at one end protruding in the axial direction from the core in the circumferential direction. The connecting portions of the two-phase coils different from each other arranged at the same position in the core radial direction are arranged side by side at a predetermined interval in the circumferential direction, thereby connecting the two connecting portions. It is preferable that a gap between the different phases is formed in the gap, and the neutral end of each phase is drawn out in the axial direction through the gap between the different phases and connected to the connection conductor.

  According to this configuration, the constituent coil of each phase can be appropriately configured by the coil side portion and the transition portion. In addition, at the same position in the core radial direction, the transition portions of the two-phase coils that are different from each other across the gap between the different phases are arranged side by side with a predetermined interval in the circumferential direction. By connecting the neutral ends of the phases in the axial direction and connecting them to the connecting conductor, the neutral ends of each phase can be connected without interfering with the crossover within the range occupied by the core in the core radial direction. It can be connected to a conductor. Therefore, it is possible to appropriately perform star connection while suppressing an increase in the size of a portion (a so-called coil end portion) protruding from the core of the constituent coil.

  Further, for each of the constituent coils, the two coil side portions are arranged in the core radial direction in the same slot, and the two transition portions continuously extending from the two coil side portions are shafts. It is suitable if it is the structure arrange | positioned in the direction view.

  According to this configuration, in each constituent coil, the two coil side portions arranged side by side in the core radial direction are arranged such that the transition portions extending from these are overlapped in the axial direction. Adjacent to the core radial direction, a space corresponding to the width of one coil is formed. Therefore, by using the space, the crossing portions having different phases can be arranged side by side in the core radial direction, so that the coil end portion can be configured compactly. In addition, when the neutral end is pulled out in the axial direction through the gap between the different phases, it is easy to secure a space for pulling out the neutral end.

  Further, for each phase, the coil sides continuously extending from the two neutral ends are arranged side by side in the core radial direction with an interval corresponding to the one coil in the same slot, and It is preferable that the connection conductor is configured to have a width substantially equal to the core radial width of the coil.

  According to this configuration, a portion extending continuously from two coil sides arranged at an interval of one coil in the same slot is drawn out as a neutral end while maintaining the same interval, Can be connected to a connecting conductor. At that time, even when it is necessary to perform bending, it can be pulled out in the axial direction with a small number of bendings. Therefore, the productivity at the time of star connection of the coils of each phase can be made favorable.

  Further, the constituent coil of each phase is composed of a linear conductor having a substantially rectangular cross section, and the two neutral ends of each phase are arranged so that opposing surfaces facing each other are substantially parallel, and the connection conductor is It is preferable to have a configuration that is formed of a plate-like member and has a shape that is bent at least at two locations in the circumferential direction so that both surfaces in the core radial direction are substantially parallel to the facing surface.

  According to this configuration, the connection conductor made of a plate-like member and the substantially rectangular cross section are formed by bending the connection conductor at least at two locations in the circumferential direction so that the neutral ends of each phase are aligned in the core radial direction. The neutral ends of the linear conductors can be connected in a state where they are in surface contact. Therefore, the connection conductor and the neutral end of each phase can be favorably joined.

  In addition, the connection conductor includes a plurality of recesses in a shape slightly recessed with respect to other portions of the connection conductor on both surfaces in the core radial direction at the connection portion with the neutral end of each phase, A configuration in which the connecting conductor and the neutral end of each phase are joined by resistance brazing in a state where a wax material having a core radial width corresponding to the depth of the concave portion is interposed in the concave portion. This is preferable.

  According to this configuration, the connecting conductor and the neutral end of each phase are joined by resistance brazing while the brazing material is interposed between the connecting conductor and the neutral end without causing unnecessary stress. be able to. At that time, since the core radial direction width of the connecting conductor at the connecting portion with the neutral end is thinner than other portions, the heat capacity of the connecting portion can be reduced and compared with the case where no recess is provided. Thus, it is possible to reduce the electric energy input to perform resistance brazing. Therefore, since resistance brazing can be performed under milder conditions, it is possible to suppress the thermal influence on the portions other than the concave portions of the connection conductor while keeping the bonding strength at a constant level.

It is sectional drawing which shows the whole structure of the rotary electric machine which concerns on embodiment of this invention. It is a perspective view showing the whole stator composition concerning the embodiment of the present invention. It is a schematic diagram which shows the connection state of each phase coil of the stator which concerns on embodiment of this invention. It is a perspective view which shows a part of component coil which concerns on embodiment of this invention. It is an expansion perspective view which shows the neutral point vicinity of the stator which concerns on embodiment of this invention. It is an expansion perspective view which shows the neutral point vicinity of the stator which concerns on embodiment of this invention. It is a schematic diagram which shows arrangement | positioning of the coil of the stator which concerns on embodiment of this invention. It is a schematic diagram which shows the connection structure of the connection conductor which concerns on embodiment of this invention, and the neutral end of each phase.

  An embodiment of an armature for a rotating electrical machine according to the present invention will be described with reference to the drawings. In the present embodiment, the case where the armature for a rotating electrical machine according to the present invention is applied to the stator 2 of the rotating electrical machine 1 will be described as an example. As shown in FIGS. 1 to 3, the stator 2 includes a substantially cylindrical stator core 11 having a plurality of slots 12 distributed in the circumferential direction, a plurality of coils 21 wound around the slots 12, and the plurality of stator cores 11. A neutral conductor 41 for connecting the end portions of the phase coil 21 so as to be star-connected to each other. In such a configuration, the stator 2 according to the present embodiment has two constituent coils 22 and 23 in which the coils 21 of the respective phases are connected in parallel, and the neutral point N of the two constituent coils 22 and 23. The neutral ends 24, which are side ends, are arranged side by side in the core radial direction, and for each phase, the two neutral ends 24 arranged side by side in the core radial direction connect the neutral conductor 41 from both sides in the core radial direction. It is characterized in that it is connected to the neutral conductor 41 in a sandwiched state (see FIGS. 5 and 6). Thereby, it is possible to reduce the size and improve the efficiency of the rotating electrical machine 1 at low cost. Hereinafter, the configuration of each part of the rotating electrical machine 1 will be described in detail. In the present embodiment, the stator 2 corresponds to the “armature for rotating electrical machine” in the present invention, and the stator core 11 corresponds to the “core” in the present invention. Further, the neutral conductor 41 corresponds to the “connection conductor” in the present invention.

1. Overall Configuration of Rotating Electric Machine As shown in FIG. 1, the rotating electric machine 1 includes a stator 2, a rotor 3, and a case 5. The stator 2 includes a coil 21, and a magnetic field can be generated by passing a current through the coil 21. The stator 2 is fixed to the inner peripheral surface of the case 5. The configuration of the stator 2 will be described in detail later. Further, on the inner side in the core radial direction of the stator 2, a rotor 3 as a magnetic field provided with a permanent magnet (not shown) is disposed so as to be relatively rotatable with respect to the stator 2 with the rotor shaft 4 as a rotation axis. ing. That is, the rotating electrical machine 1 in this embodiment is an inner rotor type rotating electrical machine including a stator 2 as an armature. The case 5 is formed in a cylindrical shape in which an end wall 5a is provided on one side in the axial direction. The case 5 opens to the other side in the axial direction, and a cover 6 is attached to the case 5 so as to close the opening. A bearing 7 is provided in the central portion in the core radial direction of the end wall 5a of the case 5 and the cover 6, and the rotor 3 and the rotor shaft 4 are rotatably supported with respect to the case 5 and the cover 6 via the bearing 7. Has been.

2. Configuration of Stator As shown in FIG. 2, the stator 2 includes a stator core 11, a coil 21, and a neutral conductor 41. The stator core 11 is made of a magnetic material and has a substantially cylindrical shape. The stator core 11 has a plurality of slots 12 distributed in the circumferential direction on the inner peripheral surface thereof. The plurality of slots 12 are provided to extend in the axial direction at predetermined circumferential intervals. Each slot 12 is formed in the same cross-sectional shape in the cross section in the plane orthogonal to the axial direction. In this example, the opening width (circumferential width) that opens inward in the core radial direction of the slot 12 is formed narrower than the circumferential width inside the slot 12, and the slot 12 is a so-called semi-open slot. In the present embodiment, the stator core 11 is provided with a total of 48 slots 12 on the entire circumference. In each slot 12 of the stator core 11, a coil 21 of a plurality of phases (three phases of U phase, V phase, and W phase in this example) is wound in the form of wave winding and distributed winding. And the stator 2 which concerns on this embodiment is used as the stator used for the rotary electric machine 1 driven by a three-phase alternating current. In the following description, each member constituting the coil 21 is shown as a member such as 21u, 21v, and 21w, particularly when it is necessary to distinguish between the U phase, the V phase, and the W phase. The description will be made by adding lower case letters “u”, “v” and “w” after the sign.

  Moreover, in this embodiment, as shown in FIG. 3, each phase coil 21 has two component coils 22 and 23, respectively, and these two component coils 22 and 23 are connected in parallel. Yes. That is, the U-phase connection terminal Tu is connected to the U-phase first component coil 22u and the U-phase second component coil 23u, respectively, and is the end on the neutral point N side of these component coils 22u, 23u. Two neutral ends 24u (see FIG. 5) are connected to the neutral conductor 41, respectively. A V-phase first component coil 22v and a V-phase second component coil 23v are connected to the V-phase connection terminal Tv, respectively, and two end points on the neutral point N side of these component coils 22v and 23v are provided. The neutral ends 24v (see FIG. 5) are connected to the neutral conductors 41, respectively. A W-phase first component coil 22w and a W-phase second component coil 23w are connected to the W-phase connection terminal Tw, respectively, and two end points on the neutral point N side of these component coils 22w and 23w The neutral ends 24w (see FIG. 5) are connected to the neutral conductors 41, respectively. In the present application, the “neutral end 24” is a portion that is connected to the neutral conductor 41 among the conductors that constitute the constituent coils 22 and 23, and that protrudes to the other side in the axial direction from the stator core 11. It shall refer to the whole. Three-phase excitation currents having a predetermined phase difference are supplied from the connection terminals T of the respective phases to the coils 21 of the respective phases thus connected. As a result, the stator 2 generates a rotating magnetic field to rotate the rotor 3.

  In the present embodiment, the constituent coils 22 and 23 of each phase are constituted by linear conductors having a substantially rectangular cross section in a plane orthogonal to the longitudinal direction (equal to the energizing direction). The material constituting this linear conductor can be, for example, copper or aluminum. The surface of the linear conductor is covered with an insulating coating made of a resin or the like except for the connection portion with the neutral conductor 41 that needs to be joined and the connection portion in the connection connecting portion 33 (see FIG. 2). FIG. 4 is a perspective view showing a part of the constituent coils 22 and 23 according to the present embodiment. The constituent coils 22 and 23 according to this embodiment are configured by connecting two unit coils C shown in FIG. 4 in series. That is, as shown in FIG. 3, each phase coil 21 according to the present embodiment includes two component coils 22 and 23 configured by connecting two unit coils C in series, and connected in parallel. It is configured.

  The phase-constituting coils 22 and 23 composed of two unit coils C connected in series are in-phase with the coil side 31 arranged in the slot 12 and in the two slots 12 having different circumferential positions. The coil side portion 31 is connected to the end portion in the axial direction of the stator core 11 in the circumferential direction. In the unit coil C constituting each of the constituent coils 22 and 23, two coil side portions 31 are arranged side by side in the core radial direction, and two sets of two coil side portions 31 arranged side by side in the core radial direction are provided. They are arranged side by side in the circumferential direction. Here, the constituent coils 22, 23 are distributed substantially at predetermined intervals in the circumferential direction corresponding to the positions of the plurality of slots 12 provided on the inner peripheral surface of the stator core 11, and the coil portions 23, 23 are substantially omitted as a whole. It is formed in a cylindrical shape. The constituent coils 22 and 23 of each phase are arranged side by side in the core radial direction, whereby the coils 21 of each phase are also formed in a substantially cylindrical shape as a whole. In the state where the coils 21 of the respective phases are wound around the stator core 11, in the two slots 12 adjacent to each other, the two coil side portions 31 are arranged side by side in the core radial direction in the same slot 12.

  In the present embodiment, the transition portion 32 on one side in the axial direction of the stator core 11 (the lower side in FIG. 2 and the upper side in FIG. 4) is a bent transition portion 34 that is bent inward in the core radial direction. The bending crossing 34 of each phase connects a radial conductor 34a continuously extending from the coil side 31 and extending in the core radial direction, and two radial conductors 34a having different circumferential positions in the circumferential direction. And a circumferential conductor portion 34b. Although a detailed description is omitted here, in the state where the three-phase coils 21 are combined, the circumferential conductor portion 34b of two phases out of the three phases extends in the axial direction in the bent crossover portion 34. They are arranged side by side. Further, in the present embodiment, in the state of being wound around the stator core 11, the positions of the radial conductor portions 34a of the constituent coils 22 and 23 of the respective phases corresponding to the openings on the inner side in the core radial direction of the slots 12 are as follows. A narrow recess 35 narrower than the circumferential width of the opening is formed. Accordingly, the three-phase coil 21 can be inserted into the stator core 11 from one side in the axial direction and wound around the semi-open slot 12.

  On the other hand, the crossover portion 32 on the other axial side of the stator core 11 (the upper side in FIG. 2 and the lower side in FIG. 4) is not bent inward in the core radial direction, and two coil sides having different circumferential positions are formed. On the outer side in the axial direction of the portion 31 (on the other side in the axial direction), these are directly connected in the circumferential direction by the circumferential conductor portion 32b. In the present embodiment, as shown in FIG. 2, in the crossover portion 32, circumferential conductor portions 32 b for two phases of the three phases are arranged side by side in the core radial direction over the entire circumference. More specifically, as shown in FIGS. 5 and 6, the circumferential conductor portion 32bv constituting the constituent coils 22v and 23v of the V-phase coil 21v has a step portion in the core radial direction at the circumferential center portion thereof. The part on one side in the circumferential direction is offset outward in the core radial direction with respect to the part on the other side in the circumferential direction. And the site | part of the circumferential direction other side of the circumferential direction conductor part 32bw which comprises the W phase coil 21w is arrange | positioned inside the core radial direction inside the site | part of the circumferential direction one side of the circumferential direction conductor part 32bv which comprises the V phase coil 21v. ing. In addition, a portion on one side in the circumferential direction of the circumferential conductor portion 32bu constituting the U-phase coil 21u is arranged on the outer side in the core radial direction of the portion on the other circumferential side of the circumferential conductor portion 32bv constituting the V-phase coil. Yes. Further, a portion on one side in the circumferential direction of the circumferential conductor portion 32bw constituting the W-phase coil 21w is arranged on the inner side in the core radial direction of the portion on the other circumferential side of the circumferential conductor portion 32bu constituting the U-phase coil 21u. ing.

  Further, on the other side in the axial direction of the stator core 11, apart from the normal transition portion 32, a connection transition portion 33 for connecting two unit coils C in series is provided in each of the constituent coils 22 and 23. . In this embodiment, the unit coil C (refer FIG. 4) which comprises the coil 21 of each phase is wound by the stator core 11 in the state arranged in the core radial direction 4 each about each phase. And in the 1st component coil 22, the unit coil C arrange | positioned in the core radial direction among the four unit coils C, and the innermost circumference side in a core radial direction by the connection crossing part 33 of each phase Are connected in series with the unit coil C. In addition, the second connecting coil 33 is configured by connecting these unit coils C so that the remaining two unit coils C are connected in series by another connecting and connecting portion 33.

  The connection crossing portion 33 of each phase is arranged on the outer side in the axial direction (the other side in the axial direction) of the crossing portion 32, and the coil side portion 31 constituting the two unit coils C arranged at different positions in the core radial direction. And the coil side part 31 arrange | positioned in the two slots 12 from which the position of the circumferential direction differs is connected to the core radial direction and the circumferential direction. In order to realize such a configuration, the connection connecting portion 33 includes a radial conductor portion 33a, a circumferential conductor portion 33b, and an axial conductor portion 33c. Further, in the present embodiment, since the connection connecting portion 33 is configured by pulling out and joining the end portions of the two unit coils C, in order to secure a space for the joining. In addition, in order to realize a configuration in which it is easy to appropriately ensure insulation, each connection crossing portion 33 is arranged at a predetermined interval from the neutral end 24 and other connection crossing portions 33. Therefore, as shown in FIG. 5 and FIG. 6, each connection crossing portion 33 is in a form bent and extended in a complicated manner in the core radial direction, the circumferential direction, and the axial direction, and at different positions in the core radial direction and the circumferential direction. Two arranged coil side portions 31 are connected.

  By the way, on the other axial side of the stator core 11, two transition portions 32 continuously extending from the two coil side portions 31 are arranged so as to overlap in the axial direction view. As described above, in each of the constituent coils 22 and 23, the two coil side portions 31 are arranged side by side in the core radial direction in the same slot 12. Therefore, when viewed with respect to the constituent coils 22 and 23 of each phase, the linear conductors constituting the constituent coils 22 and 23 are adjacent to the core radial direction in the portion of the circumferential conductor part 32b constituting the crossover part 32. A space corresponding to the width in the core radial direction for one conductor is generated. Using this space, the circumferential conductor 32b of the other phase is arranged as described above.

  In the present embodiment, for each of the first component coil 22 and the second component coil 23 of each phase, a conductor portion continuously extending from the coil side portion 31 included in the unit coil C disposed on the inner peripheral side in the core radial direction. Is the neutral end 24 of each phase. In each unit coil C, two coil side portions 31 are arranged side by side in the core radial direction in the same slot 12, and the coil side portions 31 that continuously extend from the two neutral ends 24 of each phase are also included. In the same slot 12, the coil 21 is arranged side by side in the core radial direction with an interval corresponding to one linear conductor (corresponding to the width in the core radial direction of the linear conductor). In the present embodiment, the two neutral ends 24 of each phase are pulled out in the axial direction by the same bending process on the other axial side of the stator core 11, and the interval corresponding to one linear conductor is maintained. The neutral conductor 41 is connected.

  The neutral conductor 41 is a conductor for connecting the ends (neutral ends 24) of the coils 21 of the respective phases so as to be star-connected to each other. In the present embodiment, the neutral conductor 41 is configured by a plate-like member. The material constituting the neutral conductor 41 can be, for example, copper or aluminum. The surface of the neutral conductor 41 is covered with an insulating coating made of a resin or the like, except for the connection portion with the neutral end 24 of each phase that needs to be joined. The neutral conductor 41 according to the present embodiment is configured to have a radial width that is substantially equal to the core radial width of the linear conductor constituting the coil 21. Thereby, the neutral conductor 41 is connected to each neutral end 24 in a form that fits between the two neutral ends 24 in each phase without excess or deficiency. In the present embodiment, the neutral conductor 41 is substantially equal to twice the circumferential width of the linear conductor constituting the coil 21 in correspondence with the two constituent coils 22 and 23 being connected in parallel. It has an axial width. That is, the cross-sectional area of the surface perpendicular to the energization direction (substantially equal to the circumferential direction) of the neutral conductor 41 is substantially equal to the sum of the cross-sectional areas of the surfaces orthogonal to the energization direction of the constituent coils 22 and 23 of each phase. Furthermore, the core radial width and the axial width of the neutral conductor 41 are set.

3. Next, a connection structure between the neutral conductor 41 and the neutral end 24 of each phase, which is a main part of the present invention, will be described. 5 and 6 are enlarged perspective views of the periphery of the neutral conductor 11 of the stator 2 according to the present embodiment as seen from different directions. FIG. 7 is a schematic diagram showing the arrangement of the coils 21 of each phase when the coils 21 of each phase of the stator 11 according to this embodiment are viewed from the outside in the axial direction (the other side in the axial direction). In FIG. 7, “□” indicated by an alternate long and short dash line arranged vertically 8 represents the eight coil side portions 31 arranged side by side in the core radial direction in the same slot 12. In consideration of visibility, these are arranged side by side with a predetermined interval in the core radial direction.

  As described above, in the present embodiment, in the unit coil C constituting each of the constituent coils 22 and 23, the two coil side portions 31 are arranged side by side in the core radial direction in the same slot 12, and the core radial direction Two sets of two coil side portions 31 arranged side by side are arranged in the circumferential direction. In each unit coil C, a total of four transition portions 32 extending continuously from the two sets of two coil side portions 31 arranged side by side in the circumferential direction are arranged so as to overlap in the axial direction. Therefore, when viewed with respect to the constituent coils 22 and 23 of each phase, the linear conductors constituting the constituent coils 22 and 23 are adjacent to the core radial direction in the portion of the circumferential conductor part 32b constituting the crossover part 32. A space corresponding to the core radial width for one conductor is generated.

  Another two-phase circumferential conductor portion 32b is arranged in the space thus generated. Specifically, adjacent to the inner side in the core radial direction of the circumferential conductor part 32bu constituting the U-phase transition part 32u, the circumferential conductor part 32bv constituting the V-phase transition part 32v and the W-phase transition part 32w. The circumferential direction conductor part 32bw which comprises is arrange | positioned. Further, adjacent to the core radial direction of the circumferential conductor part 32bv constituting the V-phase transition part 32v, the circumferential conductor part 32bu constituting the U-phase transition part 32u and the circumference constituting the W-phase transition part 32w. A direction conductor portion 32bw is arranged. Here, on one side in the circumferential direction of the circumferential conductor portion 32bv constituting the V-phase transition portion 32v, a circumferential conductor portion 32bw constituting the W-phase transition portion 32w is disposed adjacent to the inner side in the core radial direction, On the other circumferential side of the circumferential conductor portion 32bv constituting the V-phase transition portion 32v, a circumferential conductor portion 32bu constituting the U-phase transition portion 32u is disposed adjacent to the outer side in the core radial direction. Further, adjacent to the outer side in the core radial direction of the circumferential conductor part 32bw constituting the W-phase transition part 32w, the circumferential conductor part 32bu constituting the U-phase transition part 32u and the V-phase transition part 32v are constituted. A circumferential conductor portion 32bv is disposed.

  And the crossover part 32 of the mutually different two-phase coil 21 arrange | positioned in the same position of a core radial direction is arrange | positioned along with the predetermined interval in the circumferential direction, and between different phases between the said two crossover parts 32 is arranged. A gap S is formed. In this example, the circumferential conductor portion 32bv constituting the V-phase crossing portion 32v has a step portion in the core radial direction at the circumferential central portion, and a portion on one side in the circumferential direction is a portion on the other side in the circumferential direction. Thus, the gap S between different phases is offset between the end on one side in the circumferential direction of the W-phase transition portion 32w and the V-phase gap, as shown in FIGS. Between the end portion on the other circumferential side of the transition portion 32v, between the step portion of the V-phase transition portion 32v and the end portion on the other circumferential side of the W-phase transition portion 32w, and the V-phase transition portion 32v. Is formed between the end portion on one side in the circumferential direction and the end portion on the other side in the circumferential direction of the U-phase transition portion 32u. Further, the inter-phase gap S is formed side by side in the core radial direction with an interval corresponding to the width of approximately one linear conductor across the transition portion 32 of each phase. Such inter-phase gap S is a space free from a three-dimensional obstacle in the axial direction, as can be understood with reference to FIG.

  The two neutral ends 24 of each phase are drawn out in the axial direction through the inter-phase gap S formed in this way. That is, as shown in FIG. 5 to FIG. 7, in the same slot 12, the core radial direction is spaced by an interval (corresponding to the width in the core radial direction of the linear conductor) of one linear conductor constituting the coil 21. Coil side portions 31 arranged side by side (here, in the U-phase coil 21u and V-phase coil 21v, the second and fourth coil side portions 31 from the inside in the core radial direction, and in the W-phase coil 21w in the core radial direction) The first and third coil side portions 31) from the inside correspond to the width of one linear conductor after being bent into a predetermined shape in the core radial direction and circumferential direction by the same bending process. A neutral end 24 is formed by being drawn out in the axial direction through two interphase gaps S formed side by side in the core radial direction with a space therebetween. Therefore, in this configuration, the neutral end 24, which is the end of the two constituent coils 22 and 23 of each phase, on the neutral point N side, is separated from the core by an interval corresponding to the width of approximately one linear conductor. They will be arranged side by side in the radial direction.

  For each phase, the two neutral ends 24 arranged side by side in the core radial direction with an interval corresponding to the width of one linear conductor extend in the axial direction while extending the neutral conductor 41 in the core radial direction. Each is connected to the neutral conductor 41 while being sandwiched from both sides. That is, in this embodiment, the two neutral ends 24 of each phase are not connected to the neutral conductor 41 in a state where they are arranged at different positions in the circumferential direction, but are the same in the circumferential direction. The structure connected to the neutral conductor 41 at a position is adopted. As a result, the circumferential length of the neutral conductor 41 can be kept short, and the stator 2 and thus the entire rotating electrical machine 1 can be downsized. In addition, since the two neutral ends 24 of each phase are connected to the neutral conductor 41 with the neutral conductor 41 sandwiched from both sides in the core radial direction, the two neutral ends 24 of each phase coil 21 are Joining with the neutral conductor 41 can be performed collectively at one place in the circumferential direction. Therefore, the number of joints between the neutral conductor 41 and each phase coil 21 in the circumferential direction as a whole can be reduced. As a result, work efficiency can be improved and costs can be reduced.

  Further, the neutral ends 24 of the two constituent coils 22 and 23 of each phase are connected to the neutral conductor 41 on both sides in the core radial direction of the neutral conductor 41 with an interval corresponding to the width of one linear conductor. Since they are connected, the distance between these two neutral ends 24 is shortened, and it is possible to effectively suppress the occurrence of a potential difference between the neutral ends 24 of the two constituent coils of each phase. . Therefore, it can suppress that a circulating current flows between these. As a result, it is possible to improve the energy efficiency of the rotating electrical machine 1 by suppressing the occurrence of copper loss due to the circulating current.

  Here, in the present embodiment, as shown in FIGS. 5, 6, and 8, the neutral conductor 41 is provided on both sides in the core radial direction at the connection portion with the neutral end 24 of each phase. A plurality of concave portions 42 having a shape slightly recessed with respect to other portions of the conductor 41 are provided. In this example, six recesses 42 are formed in the neutral conductor 41 corresponding to six neutral ends 24 in total, two for each phase. These six recesses 42 are formed at circumferential positions corresponding to the six neutral ends 24. The depth of each concave portion 42 in the core radial direction is W3 (see FIG. 8B). Further, the bottom surface in the core radial direction of each concave portion 42 becomes a joint surface 43a to 43f on the neutral conductor 41 side with the neutral end 24, respectively. These joint surfaces 43 a to 43 f are formed so as to be parallel to both surfaces in the core radial direction in other portions of the neutral conductor 41.

  Further, the two neutral ends 24 of each phase are arranged such that the joint surfaces 25 facing each other are substantially parallel. Here, the joint surfaces 25a and 25b of the two U-phase neutral ends 24u facing each other are arranged substantially parallel to each other, and the joint surfaces 25c and 25d of the two V-phase neutral ends 24v facing each other are arranged. Are arranged so as to be substantially parallel to each other, and the joint surfaces 25e and 25f facing each other of the two neutral ends 24w of the W phase are arranged so as to be substantially parallel. In the present embodiment, each set of the joining surfaces 25a and 25b, the joining surfaces 25c and 25d, and the joining surfaces 25e and 25f constitutes “opposing surfaces facing each other” in the present invention. And the neutral conductor 41 which consists of a plate-shaped member has the shape bent at least two places of the circumferential direction, and is comprised. In this example, the neutral conductor 41 has bent portions 44 at three locations in the circumferential direction. More specifically, the first bent portion 44a and the second bent portion 44b between the neutral end 24u of the U phase and the neutral end 24v of the V phase in the circumferential direction, the neutral end 24v of the V phase and the W phase. The neutral conductor 41 has a shape that is bent at three locations, that is, the third bent portion 44c between the neutral end 24w and the neutral end 24w. Thereby, both the surfaces of the neutral conductor 41 in the core radial direction and the bonding surfaces 43a to 43f are formed in a shape substantially parallel to the bonding surfaces 25a to 25f of the neutral end 24 of each phase. Therefore, the neutral conductor 41 made of a plate-like member and the neutral end 24 made of a linear conductor having a substantially rectangular cross section are joined in a state where these joining surfaces 43a to 43f and 25a to 25f are in surface contact with each other. Therefore, it is possible to perform these bondings satisfactorily.

  Further, in this embodiment, when the neutral conductor 41 and the neutral end 24 of each phase are joined, as shown in FIG. 8A, the six concave portions 42 formed in the neutral conductor 41 are formed. In each state, the neutral end 24 of each phase is clamped by the electrodes 52 from both sides in the core radial direction, with the wax material 51 having a core radial width corresponding to the core radial depth W3 of the concave portion 42 interposed therebetween. After that, the neutral conductor 41 and the neutral end 24 of each phase are joined by resistance brazing. In this way, the neutral conductor 41 and the neutral end 24 of each phase can be obtained in a state where the wax material 51 is interposed between the neutral conductor 41 and the neutral end 24 without applying unnecessary stress. Can be joined by resistance brazing. At that time, if the core radial direction width of the linear conductor and the neutral conductor 41 constituting the coil 21 of each phase is W1, the neutral conductor at the connecting portion with the neutral end 24 is formed by the concave portions 42 on both sides of the core radial direction. Since the core radial width W2 of 41 is thin (W2 = W1-2 × W3, see FIG. 8B), the heat capacity of the connection part can be reduced, and the concave portion 42 is not provided. In comparison, it is possible to reduce the electric energy input to perform resistance brazing. Therefore, since resistance brazing can be performed under milder conditions, it is possible to suppress the thermal influence on the portion other than the concave portion 42 of the neutral conductor 41 while keeping the bonding strength at a certain level. .

[Other Embodiments]
(1) In the above-described embodiment, the two neutral ends 24 of each phase are arranged so that the crossing portions 32 of the two-phase coils 21 arranged at the same position in the core radial direction have a predetermined interval in the circumferential direction. In the above description, the case where the two conductors are arranged side by side and drawn out in the axial direction through the inter-phase gap S formed between the two transition portions 32 and connected to the neutral conductor 41 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, without passing through the inter-phase gap S formed in this way, for example, the two neutral ends 24 of each phase are arranged in the core radial direction of the plurality of transition portions 32 arranged side by side in the core radial direction, or One of the preferred embodiments of the present invention is a configuration in which the core is drawn out in the axial direction through the outside in the core radial direction and connected to the neutral conductor 41.

(2) In the above embodiment, the neutral conductor 41 has a core radial direction width that is substantially equal to the core radial direction width of the linear conductor that constitutes the coil 21, and the circumference of the linear conductor that constitutes the coil 21. The case where it has an axial width substantially equal to twice the width in the direction has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for each phase, as long as the two neutral ends 24 arranged side by side in the core radial direction are connected to the neutral conductor 41 with the neutral conductor 41 sandwiched from both sides in the core radial direction, The width in the core radial direction of the conductive conductor 41 can be set arbitrarily. In this case, the cross-sectional area of the surface perpendicular to the energizing direction (substantially equal to the circumferential direction) of the neutral conductor 41 is the sum of the cross-sectional areas of the surfaces orthogonal to the energizing direction of the constituent coils 22 and 23 of each phase. It is preferable that the axial width of the neutral conductor 41 is set according to the core radial width. Further, in accordance with the core radial width of the neutral conductor 41, the neutral end 24 of each phase is pulled out in the axial direction through the inter-phase gap S, and on the outer side in the axial direction (on the other side in the axial direction) of the transition portion 32. A configuration in which bending is appropriately performed in the core radial direction is preferable.

(3) In the above-described embodiment, the case where the neutral conductor 41 made of a plate-like member is configured to have a shape bent at three locations in the circumferential direction has been described as an example. However, the embodiment of the present invention is not limited to this. That is, if both surfaces of the neutral conductor 41 in the core radial direction and the bonding surfaces 43a to 43f are substantially parallel to the bonding surfaces 25a to 25f of the neutral end 24 of each phase, the bonding can be performed satisfactorily. Therefore, for example, it is one of the preferred embodiments of the present invention to form a bent shape at two locations in the circumferential direction or at four or more locations in the circumferential direction. Alternatively, forming the entire neutral conductor 41 in a substantially arc shape along the shape of the stator core 11 is also one preferred embodiment of the present invention.

(4) In the above embodiment, the neutral conductor 41 is slightly recessed with respect to the other portions of the neutral conductor 41 on both surfaces in the core radial direction at the connection portion with the neutral end 24 of each phase. In the above description, the case where the concave portion 42 having the depth W3 in the core radial direction is provided as an example. However, the embodiment of the present invention is not limited to this. That is, for example, the neutral conductor 41 has a shape slightly depressed with respect to the other part of the neutral conductor 41 on one side in the core radial direction at the connection portion with the neutral end 24 of each phase, It is one of the preferred embodiments of the present invention to have a recess having a depth in the core radial direction corresponding to 2 × W3. In this case, with the wax material 51 having a core radial width of W3 interposed between both the surface where the concave portion is formed and the surface where the concave portion is not formed on both surfaces of the neutral conductor 41 in the core radial direction, It is preferable that the neutral end 24 of each phase is clamped by the electrode 52 from both sides in the core radial direction and then energized to join the neutral conductor 41 and the neutral end 24 of each phase by resistance brazing.
Moreover, it is also one of the preferable embodiments of the present invention that the neutral conductor 41 does not have such a concave portion, and both surfaces of the neutral conductor 41 are uniform planes.

(5) In the above embodiment, the case where the neutral conductor 41 and the neutral end 24 of each phase are joined by resistance brazing has been described as an example. However, the embodiment of the present invention is not limited to this. That is, in addition to resistance brazing, various connection methods such as welding, caulking, soldering, and connection using a connection member can be employed.

(6) In the above embodiment, the case where the constituent coils 22 and 23 of each phase are constituted by linear conductors whose cross-sectional shape in a plane orthogonal to the longitudinal direction (equal to the energizing direction) is substantially rectangular. Described as an example. However, the embodiment of the present invention is not limited to this. That is, it is also one of the preferred embodiments of the present invention that the cross-sectional shape in the plane orthogonal to the longitudinal direction of the constituent coils 22 and 23 of each phase is, for example, a polygonal shape, a race track shape, a circular shape or the like. . Alternatively, it is also one of preferred embodiments of the present invention that the constituent coils 22 and 23 of each phase are configured by bundling a plurality of thin conductor wires so that the overall cross-sectional shape thereof is a predetermined shape as described above. It is.

(7) In the above embodiment, the case where each phase coil 21 has two constituent coils 22 and 23 and these two constituent coils 22 and 23 are connected in parallel is described as an example. did. However, the embodiment of the present invention is not limited to this. That is, it is also one preferred embodiment of the present invention that each phase coil 21 has three or more constituent coils and these are connected in parallel. Moreover, in said embodiment, the case where each unit coil 22 and 23 of each phase was comprised by connecting two unit coils C in series was demonstrated as an example. However, the embodiment of the present invention is not limited to this. That is, it is also one of the preferred embodiments of the present invention that each phase component coil has three or more unit coils C and these are connected in series. Or it is also one of the suitable embodiment of this invention that the coil of each phase is comprised by the single unit coil C. FIG.

(8) In the above embodiment, when each of the constituent coils 22 and 23 of each phase is configured by connecting two unit coils C in series, four units are arranged side by side in the core radial direction. Out of the coils C, the outermost unit coil C and the innermost unit coil C are connected by a connection crossing portion 33, and the remaining two unit coils C are connected by another connection crossing portion 33. An example has been described. However, the embodiment of the present invention is not limited to this. That is, for example, two outer side unit coils C and two inner side unit coils C are connected by the connection connecting portion 33, or two first and third unit coils from the outer side. It is also one of preferred embodiments of the present invention that C and the second and fourth unit coils C from the outer peripheral side are connected by the connection connecting portion 33, respectively.

(9) In the above embodiment, the armature for a rotating electrical machine according to the present invention is applied to the stator 2 of the rotating electrical machine 1, and the rotating electrical machine 1 is used for the rotor 3 having the stator 2 as the armature as a field. The case where the inner rotor type rotating electrical machine is arranged and provided on the outer side in the core radial direction has been described as an example. However, the embodiment of the present invention is not limited to this. That is, in the above configuration, the armature according to the present invention is applied to a rotor of a rotating electric machine, and the rotating electric machine may be an outer rotor type rotating electric machine including a rotor as an armature. This is one of the preferred embodiments.
Moreover, the armature which concerns on this invention is applied to the stator 2 of the rotary electric machine 1, and the said rotary electric machine 1 is arrange | positioned by arrange | positioning the stator 2 as an armature inside the core radial direction of the rotor 3 as a field. A rotor-type rotating electrical machine is also one preferred embodiment of the present invention. Furthermore, in this case, the armature according to the present invention may be applied to a rotor of a rotating electrical machine, and the rotating electrical machine may be an inner rotor type rotating electrical machine having a rotor as an armature. This is one of the embodiments.

  The present invention can be suitably used for an armature for a rotating electrical machine in which a plurality of phase coils are connected in parallel and the plurality of phase coils are star-connected to each other.

2 Stator (rotary electric armature)
11 Stator core (core)
12 slot 21 coil 22 first component coil (component coil)
23 Second component coil (component coil)
24 Neutral end 31 Coil side 32 Crossing 41 Neutral conductor (connection conductor)
42 Concave portion 51 Wax material S Interphase gap N Neutral point

Claims (6)

A substantially cylindrical core having a plurality of slots distributed in the circumferential direction, a multi-phase coil wound around the slot, and a connection for connecting the ends of the multi-phase coil in a star connection to each other An armature for a rotating electrical machine comprising a conductor,
The coil of each phase has two constituent coils connected in parallel, and the neutral ends that are the ends of the two constituent coils on the neutral point side are arranged side by side in the core radial direction,
For each phase, the two neutral ends arranged side by side in the core radial direction are respectively connected to the connection conductor in a state where the connection conductor is sandwiched from both sides in the core radial direction. The constituent coils of each phase are connected by connecting, in the circumferential direction, two coil sides arranged in two slots having different circumferential positions at one end protruding in the axial direction from the core. Part
The crossing portions of two different phase coils arranged at the same position in the core radial direction are arranged side by side at a predetermined interval in the circumferential direction, thereby forming a gap between the two phases. ,
The armature for a rotating electrical machine according to claim 1, wherein the neutral end of each phase is drawn out in an axial direction through the gap between the different phases and connected to the connection conductor.   For each of the constituent coils, the two coil side portions are arranged in the core radial direction in the same slot, and the two transition portions continuously extending from the two coil side portions are viewed in the axial direction. The armature for a rotating electrical machine according to claim 2, wherein the armature is disposed so as to overlap with each other. For each phase, the coil sides continuously extending from the two neutral ends are arranged side by side in the core radial direction with an interval of one coil in the same slot,
The armature for a rotating electrical machine according to claim 3, wherein the connection conductor is configured to have a width substantially equal to a width in a core radial direction of the coil. The constituent coil of each phase consists of a linear conductor having a substantially rectangular cross section,
The two neutral ends of each phase are arranged so that the opposing surfaces facing each other are substantially parallel,
5. The rotating electrical machine according to claim 4, wherein the connection conductor is formed of a plate-like member and has a shape bent at least at two locations in the circumferential direction so that both surfaces in the core radial direction are substantially parallel to the facing surface. Armature. The connection conductor includes a plurality of recesses in a shape slightly recessed with respect to other portions of the connection conductor on both surfaces in the core radial direction at the connection portion with the neutral end of each phase,
The connection conductor and the neutral end of each phase are joined by resistance brazing in a state where a wax material having a core radial width corresponding to the depth of the recess is interposed in each recess. The armature for rotary electric machines according to claim 5.

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