JP2016111757A - Rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a full length in an axial direction from being increased, in a configuration of a rotary electric machine stator where a three-phase stator coil is connected by a delta connection.SOLUTION: The stator includes: stator coils of three phases which are connected by the delta connection, the stator coil of each phase being wound around teeth in a concentrated manner; terminals 40u, 40v and 40w of three phases which are disposed at outer diameter sides of the stator cores; same-phase motive force lines 50u, 50v and 50w whose one end is connected to the terminal of each phase and the other end is connected to the stator coil of the same phase as the corresponding terminal; and different-phase motive force lines 53uw, 53vu and 53wv whose one end is connected to the terminal of each phase and the other end is connected to the stator coil of a phase different from the corresponding terminal. The plurality of same-phase motive force lines and different phase motive force lines at least partially cross each other radially outside of a one-side coil end 28 of the stator coils in a view in the axial direction.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a rotating electrical machine stator including a three-phase stator coil wound around a tooth of a stator core by concentrated winding and connected by a delta connection, and a three-phase terminal.

  A rotating electrical machine that is a motor or a generator includes a stator and a rotor. As a stator, a configuration in which a three-phase stator coil is wound around a tooth of a stator core is generally used. Three-phase stator coil connection formats include a Y-connection format in which one end of a three-phase stator coil is connected at a neutral point, and a delta connection format in which different two-phase stator coils are connected at three connections. There is.

  Patent Document 1 describes a configuration in which three-phase stator coils are connected by Y connection. The stator coil of each phase is formed by arranging a plurality of corrugated conductors in a cylindrical shape and connecting the ends by welding. A terminal for each phase is connected to one end disposed at the radially outer end of the stator coil for each phase.

  Patent Document 2 describes a configuration in which three-phase stator coils are connected by a delta connection, and stator coils for each phase are wound around a plurality of teeth of a stator core in a concentrated manner. Of the three-phase stator coils, two different-phase stator coils are connected by an arc-shaped bus bar arranged on one axial end side of the stator core. The end of one stator coil of the two stator coils is led out in the axial direction and connected to the terminal of the corresponding phase.

JP 2012-029355 A JP2013-236455A

  In the case of the delta connection type, it is necessary to electrically connect the terminals of each phase and the two stator coils of different phases.

  In the configuration described in Patent Document 2, two different-phase stator coils are connected to each of a plurality of arc-shaped bus bars arranged at one end of the stator coil in the axial direction. This may increase the overall axial length of the stator including the arc-shaped bus bar.

  In addition, when three-phase stator coils are connected by delta connection, a configuration in which two different-phase stator coils are connected by a different-phase connecting wire arranged at one end in the axial direction of the stator coil is also conceivable. In this configuration, by connecting one end of the cross-phase crossover wire and one end of one of the two stator coils to the terminal, the three-phase stator coils are connected by delta connection. However, in this configuration, there are many portions where a plurality of cross-phase crossover lines intersect as seen in the axial direction of the stator, and the overall length of the stator in the axial direction may increase.

  An object of the present invention is to provide a rotating electrical machine stator that can suppress an increase in the overall length in the axial direction with a configuration in which three-phase stator coils are connected by a delta connection.

  A rotating electrical machine stator according to the present invention is a three-phase stator coil connected by a delta connection to a stator core including an annular yoke and a plurality of teeth protruding radially inward at a plurality of circumferential positions of the yoke. One end is connected to the three-phase stator coil in which each phase stator coil is wound around the teeth in a concentrated manner, the three-phase terminal disposed on the outer diameter side of the stator core, and the terminal of each phase. A common-phase power line having the other end connected to the stator coil in phase with the corresponding terminal, one end connected to the terminal in each phase, and the other end connected to the stator coil in a different phase from the corresponding terminal. A different phase power line. Further, at least a part of the plurality of in-phase power lines and the plurality of different-phase power lines are arranged on the outer side from one axial end of the stator core when viewed in the axial direction. It intersects radially outward from the end.

  According to the rotating electrical machine stator according to the present invention, an increase in the total axial length can be suppressed with a configuration in which three-phase stator coils are connected by delta connection.

It is a perspective view of the rotary electric machine stator of embodiment which concerns on this invention. It is the figure which looked at a part of rotary electric machine stator shown in FIG. 1 from the outer diameter side. It is the figure seen from the upper part of FIG. It is a circuit diagram of the three-phase stator coil connected by delta connection. It is a schematic diagram which shows the relationship between the coil part which comprises the rotary electric machine stator of embodiment, a crossover, and the power line connected to a terminal. FIG. 2 is a perspective view showing a three-phase terminal connection structure extracted from FIG. 1 in the rotating electrical machine stator of the embodiment. In FIG. 6, it is a figure which shows the state before shaping | molding of a power line holding | maintenance part. It is the figure which looked at FIG. 7 from the axial direction outer side. It is a schematic diagram which shows the relationship between the coil part which comprises the rotary electric machine stator of a comparative example, a connecting wire, and the power line connected to a terminal.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. The shapes, materials, quantities, and the like described below are illustrative examples and can be changed depending on the specifications of the rotating electrical machine stator. Below, the same code | symbol is attached | subjected and demonstrated to the same structure. The rotating electrical machine stator constitutes the rotating electrical machine in combination with a rotor fixed to the rotating shaft. The rotating electrical machine is used as a motor or a generator, or a motor generator having both functions of a motor and a generator.

  FIG. 1 is a perspective view of a rotating electrical machine stator 10 of the present embodiment. FIG. 2 is a view of a part of the rotating electrical machine stator 10 shown in FIG. 1 as viewed from the outer diameter side. FIG. 3 is a view from above of FIG. Hereinafter, the rotating electrical machine stator 10 is simply referred to as a stator 10.

  The stator 10 includes a stator core 12, a three-phase stator coil 20, a three-phase terminal 40, a first in-phase power line 50u, a second in-phase power line 50v, a third in-phase power line 50w, a first in-phase power line 53uw, a first 2 different phase power line 53vu, 3rd different phase power line 53wv, and the power line holding | maintenance part 60 are comprised.

  The three-phase stator coil 20 includes a U-phase stator coil 20u, a V-phase stator coil 20v, and a W-phase stator coil 20w. The three-phase terminal 40 includes a U-phase terminal 40u, a V-phase terminal 40v, and a W-phase terminal 40w.

  The stator core 12 includes an annular yoke 13 and a plurality of teeth 14 projecting radially inward from a plurality of circumferential positions on the inner peripheral surface of the yoke 13. Stator core 12 is formed of a laminate of a plurality of electromagnetic steel plates. The stator core 12 may be formed by pressure-molding a resin binder and a magnetic material powder. Here, the “circumferential direction” refers to a circumferential direction around the central axis O of the stator 10. The “radial direction” refers to the radial direction orthogonal to the central axis O, and the “axial direction” refers to the axial direction of the stator 10.

  The three-phase stator coil 20 includes U, V, and W-phase stator coils 20u, 20v, and 20w. The stator coils 20u, 20v, and 20w for each phase include a plurality of unit coil wires 21u, 21v, It is formed by connecting 21w in series. Specifically, the U-phase stator coil 20u is formed by connecting a plurality of U-phase unit coil wires 21u in series. The U-phase unit coil wire 21u has a U-phase coil portion 22u wound around the tooth 14 in a concentrated manner, and a U-phase crossover wire 23u. The U-phase crossover wire 23u is drawn from one end of the U-phase coil portion 22u to one end side in the axial direction (upper side in FIG. 1) and disposed at one end portion in the axial direction of the three-phase stator coil 20. The U-phase crossover wire 23u is an unwinding portion of the U-phase unit coil wire 21u.

  One end of the U-phase coil portion 22u is located at the inner end of the U-phase coil portion 22u in the radial direction, and is connected to the U-phase jumper wire 23u. The other end of the U-phase coil portion 22u is located at the outer end of the U-phase coil portion 22u in the radial direction and extends outward in the axial direction (upper side in FIG. 1).

  The plurality of U-phase coil portions 22u are wound in concentrated winding around the teeth 14 arranged at every other two of the plurality of teeth 14 of the stator core 12. The U-phase crossover wire 23u is integrally connected to one end of one U-phase coil portion 22u of adjacent U-phase coil portions 22u and extends near the yoke 13 while being inclined with respect to the circumferential direction. Stretches along. The end portion of the portion extending along the circumferential direction of the U-phase connecting wire 23u bends substantially at a right angle in the vicinity of the radially outer end of the other U-phase coil portion 22u adjacent to the U-phase to one side in the axial direction. extend. One end of the U-phase crossover wire 23u extending in the axial direction and the portion of the other U-phase coil portion 22u extending in the axial direction overlap each other and are connected by welding.

  The V-phase stator coil 20v and the W-phase stator coil 20w are configured similarly to the U-phase stator coil 20u. For example, the V-phase stator coil 20v is formed by connecting a plurality of V-phase unit coil wires 21v in series. V-phase unit coil wire 21v is connected to V-phase coil portion 22v wound around tooth 14 by concentrated winding, and another V-phase coil portion 22v that is drawn out from V-phase coil portion 22v and adjacent to V-phase. V-phase crossover wire 23v.

  W-phase stator coil 20w is formed by connecting a plurality of W-phase unit coil wires 21w in series. W-phase unit coil wire 21w is connected to W-phase coil portion 22w wound around tooth 14 by concentrated winding, and another W-phase coil portion 22w that is drawn out from W-phase coil portion 22w and adjacent in W-phase. W-phase crossover wire 23w.

  Moreover, the one side coil end 28 is comprised by the part arrange | positioned in the axial direction outer side from the axial direction one end (upper end of FIG. 1, FIG. 2) of the stator core 12 among the three-phase stator coils 20. FIG. The U, V, and W phase connecting wires 23u, 23v, and 23w are arranged on the outer side in the axial direction of the one-side coil end 28 so as not to overlap each other when the stator 10 is viewed in the axial direction.

  Since the coil portions 22u, 22v, 22w and the connecting wires 23u, 23v, 23w are formed of the same member by the unit coil wires 21u, 21v, 21w of each phase, the number of parts and the number of welded portions can be reduced. Thereby, the cost of the stator 10 can be reduced. The unit coil wires 21u, 21v, 21w of each phase may be formed by rectangular wires having a rectangular cross section, or may be formed by round wires having a circular cross section.

  Also, one end of in-phase power lines 50u, 50v, 50w and different-phase power lines 53uw, 53vu, 53wv is connected to each phase terminal 40u, 40v, 40w, as will be described later. The other ends of the in-phase power lines 50u, 50v, 50w and the different-phase power lines 53uw, 53vu, 53wv are connected to two different-phase stator coils 20u, 20v, 20w. Each phase terminal 40u, 40v, 40w is connected to a three-phase terminal of an inverter connected to a DC power source (not shown) when the rotating electrical machine is used. The inverter converts a direct current from a direct current power source into an alternating current, and supplies a three-phase alternating current to the three-phase stator coil 20 through each phase terminal 40u, 40v, 40w of the stator 10.

  The U, V, W phase stator coils 20u, 20v, 20w are connected by delta connection. FIG. 4 is a circuit diagram of the three-phase stator coil 20 connected by delta connection.

  In FIG. 4, among the plurality of U-phase coil portions 22u constituting the U-phase stator coil 20u, the coil portion 22u that is electrically closest to the U-phase terminal 40u is shown as a winding start end coil portion 22u1. Yes. Of the plurality of U-phase coil portions 22u, the coil portion 22u that is electrically farthest from the U-phase terminal 40u is defined as a winding end coil portion 22u2. Of the plurality of U-phase coil portions 22u, a coil portion 22u between the winding start end coil portion 22u1 and the winding end end coil portion 22u2 is shown as an intermediate coil portion 22um.

  Similarly, in the V-phase stator coil 20v, a plurality of V-phase coil portions 22v are divided into a winding start end coil portion 22v1, a winding end end coil portion 22v2, and an intermediate coil portion 22vm. Similarly, in the W-phase stator coil 20w, a plurality of W-phase coil portions 22w are divided into a winding start end coil portion 22w1, a winding end end coil portion 22w2, and an intermediate coil portion 22wm. Also in FIG. 3, reference numerals of winding start end coil portions 22u1, 22v1, 22w1, winding end end coil portions 22u2, 22v2, 22w2, and intermediate coil portions 22um, 22vm, 22wm are used.

  A first in-phase power line 50u and a first different-phase power line 53uw are connected to the U-phase terminal 40u. One ends of the first in-phase power line 50u and the first different-phase power line 53uw are connected to the U-phase terminal 40u. The other end of the first in-phase power line 50u is connected to the winding start end coil portion 22u1 of the U-phase stator coil 20u in phase with the corresponding U-phase terminal 40u. The other end of first different phase power line 53uw is connected to winding end coil portion 22w2 of W phase stator coil 20w that is out of phase with the corresponding U phase terminal 40u. Hereinafter, the in-phase power lines 50u, 50v, and 50w may be collectively referred to as the in-phase power line 50, and the different-phase power lines 53uw, 53vu, and 53wv may be collectively referred to as the different-phase power line 53.

  In FIG. 4, two in-phase or out-of-phase U, V, and W are indicated by arrows on each in-phase power line 50 and each out-of-phase power line 53, such as “U → U”, “U → W”. The tied code is attached. In this code | symbol, the base side of the arrow has shown the phase of the terminals 40u, 40v, and 40w connected to the power lines 50 and 53. FIG. Further, the tip side of the arrow indicates the phase of the stator coils 20u, 20v, 20w connected to the power lines 50, 53. The same reference numerals are also given to the power lines 50 and 53 in FIGS.

  The V-phase terminal 40v is connected to the second in-phase power line 50v and the second different-phase power line 53vu. One ends of the second in-phase power line 50v and the second different-phase power line 53vu are connected to the V-phase terminal 40v. The other end of the second in-phase power line 50v is connected to the winding start end coil portion 22v1 of the V-phase stator coil 20v in phase with the corresponding V-phase terminal 40v. The other end of second different phase power line 53vu is connected to winding end coil portion 22u2 of U phase stator coil 20u that is out of phase with the corresponding V phase terminal 40v.

  A third in-phase power line 50w and a third different-phase power line 53wv are connected to the W-phase terminal 40w. One end of the third in-phase power line 50w and the third different-phase power line 53wv is connected to the W-phase terminal 40w. The other end of the third in-phase power line 50w is connected to the winding start end coil portion 22w1 of the W-phase stator coil 20w in phase with the corresponding W-phase terminal 40w. The other end of third third-phase power line 53wv is connected to winding end coil portion 22v2 of V-phase stator coil 20v that is out of phase with the corresponding W-phase terminal 40w.

  In FIG. 4, the coil portions 22u, 22v, and 22w of each phase are arranged in one row on the three sides of the triangle so that the three-phase coil portions 22u, 22v, and 22w do not overlap each other. On the other hand, the W, U, and V phase coil portions 22u, 22v, and 22w are actually arranged one by one in this order in the circumferential direction of the stator 10. As described below, the three-phase winding start end coil portions 22u1, 22v1, 22w1 and the winding end end coil portions 22u2, 22v2, 22w2 are arranged close to each other.

  FIG. 5 shows the relationship between the coil portions 22u, 22v, 22w, the crossover wires 23u, 23v, 23w, and the terminals 40u, 40v, 40w that are included in the stator 10 according to the embodiment, and the in-phase power line 53. It is a schematic diagram shown. In FIG. 5, the coil portions 22u, 22v, and 22w arranged along the circumferential direction are shown expanded in the lateral direction, with the upper side being the radially inner side and the lower side being the radially outer side. The coil portions 22u, 22v, and 22w are arranged one by one in the order of W, U, and V phases from the left to the right in FIG. 5, and this is repeated. Also in FIG. 5, similarly to FIG. 4, the respective phase coil portions 22 u, 22 v, 22 w are converted into winding start end coil portions 22 u 1, 22 v 1, 22 w 1, winding end end coil portions 22 u 2, 22 v 2, 22 w 2, and intermediate coil portions 22 um, 22 vm, It is divided into 22 wm.

  As shown in FIG. 5, the three-phase winding start end coil portions 22u1, 22v1, 22w1 and the winding end end coil portions 22u2, 22v2, 22w2 are arranged close to each other. As a result, in the configuration in which two phases of the three-phase stator coils 20u, 20v, and 20w are connected by different phase crossover wires as in the comparative example described with reference to FIG. May increase. In the present embodiment, in order to eliminate such inconvenience, the power lines 50 and 53 are connected to the two stator coils 20u, 20v and 20w having different phases, and one end of each of the two power lines 50 and 53 is connected to each phase terminal 40u. , 40v, 40w. Further, the intersecting portion of the plurality of power lines 50 and 53 is disposed on the radially outer side than the one side coil end 28.

  This will be described with reference to FIGS. 1 to 5 and FIGS. FIG. 6 is a perspective view showing the connection structure of the three-phase terminals 40u, 40v, and 40w in FIG. FIG. 7 shows a state before the power line holding unit 60 is molded in FIG. FIG. 8 is a view of FIG. 7 viewed from the outside in the axial direction.

  As shown in FIGS. 1 to 3, the phase terminals 40 u, 40 v, 40 w are arranged on the outer diameter side of the outer peripheral surface of the yoke 13 of the stator core 12. One end of the corresponding in-phase power line 50 and different-phase power line 53 is connected to each phase terminal 40u, 40v, 40w. The in-phase power line 50 extends in the axial direction from one end along the outer peripheral surface of the yoke 13, and is bent toward the one-side coil end 28 on the axially outer side than one axial end of the stator core 12.

  Specifically, one end of the first in-phase power line 50u and one end of the first different-phase power line 53uw are connected to the U-phase terminal 40u. For example, a U-shaped folded portion is formed at one end of the U-phase terminal 40u, and one ends of the first in-phase power line 50u and the first different-phase power line 53uw are sandwiched and connected at both sides of the folded portion. At this time, the first in-phase power line 50u and the first different-phase power line 53uw may be joined by welding so that the folded portion is not opened in a state where one end of the first in-phase power line 50u and the first different phase power line 53uw is sandwiched between the folded portions. 1 to 3, 6, and 7, the first in-phase power line 50 u and the first different-phase power line 53 uw are indicated by sand.

  Further, the other end of the first in-phase power line 50u is bent so as to extend in the axial direction in the vicinity of the other end located at the radially outer end of the U-phase winding start end coil portion 22u1 (FIG. 3). One in-phase axial direction portion 57a is formed. The first in-phase axial direction portion 57a is overlapped with the portion extending in the axial direction at the other end of the winding start end coil portion 22u1, and connected by welding. The other end of the first different-phase power line 53uw is bent so as to extend in the axial direction in the vicinity of one end located at the radially inner end of the W-phase winding end coil portion 22w2 (FIG. 3). A direction portion 58a is formed. And the 1st different phase axial direction part 58a is connected with the part extended in the axial direction at the end of the winding end coil part 22w2.

  One end of the second in-phase power line 50v and one end of the second different-phase power line 53vu are connected to the V-phase terminal 40v. In FIGS. 1 to 3, 6, and 7, the second in-phase power line 50 v and the second different-phase power line 53 vu are indicated by diagonal grids. The other end of the second in-phase power line 50v is bent so as to extend in the axial direction in the vicinity of the other end located at the radially outer end of the V-phase winding start end coil portion 22v1 (FIG. 3). An in-phase axial direction portion 57b is formed. The second in-phase axial direction portion 57b is connected to a portion extending in the axial direction at the other end of the winding start end coil portion 22v1 by welding.

  The other end of the second different-phase power line 53vu is bent so as to extend in the axial direction in the vicinity of one end located at the radially inner end of the U-phase winding end coil portion 22u2 (FIG. 3). An axial portion 58b is formed. The second different-phase axial direction portion 58b is connected to a portion extending in the axial direction at one end of the winding end end coil portion 22u2 by welding.

  One end of the third in-phase power line 50w and one end of the third different-phase power line 53wv are connected to the W-phase terminal 40w. The other end of the third in-phase power line 50w is bent so as to extend in the axial direction in the vicinity of the other end located at the radially outer end of the W-phase winding start coil portion 22w1 (FIG. 3). An in-phase axial direction portion 57c is formed. The third in-phase axial direction portion 57c is connected to a portion extending in the axial direction at the other end of the winding start end coil portion 22w1 by welding.

  The other end of the third different-phase power line 53wv is bent so as to extend in the axial direction in the vicinity of one end located at the radially inner end of the V-phase winding end coil portion 22v2 (FIG. 3). An axial portion 58c is formed. The third different-phase axial direction portion 58c is connected to the portion extending in the axial direction at the other end of the winding end end coil portion 22v2 by welding.

  As shown in FIG. 8, at least a part of the three-phase in-phase power line 50 and the out-of-phase power line 53 intersects radially outside the one-side coil end 28 when viewed in the axial direction. . Specifically, the first in-phase power line 50u and the second out-of-phase power line 53vu intersect at the position indicated by P1 in FIG. The first different-phase power line 53uw and the third different-phase power line 53wv intersect at the position indicated by P2 in FIG. The first different-phase power line 53uw and the third in-phase power line 50w intersect at the position indicated by P3 in FIG. The second different-phase power line 53vu and the third different-phase power line 53wv intersect at the position indicated by P4 in FIG. Any intersections of P1, P2, P3, and P3 are disposed on the radially outer side of the one-side coil end 28.

  Further, as shown in FIG. 7, some of the plurality of power lines 50 and 53 are resin-molded on the power line holding unit 60 by resin injection molding or the like. The intersections of P1, P2, P3, and P3 are included in the power line holding unit 60. As shown in FIG. 8, the power line holding unit 60 has a plurality of power lines 50 and 53 arranged, and is radially outside the one side coil end 28 (FIG. 1) than the axial end of the stator core 12. It is arranged outside in the axial direction. The power line holding unit 60 holds the positional relationship so that the plurality of power lines 50 and 53 do not contact each other.

  Both side surfaces in the axial direction of the power line holding portion 60 are substantially parallel planes. The axial inner side surface (lower side surface in FIG. 6) of the power line holding unit 60 is in surface contact with the axial end surface (upper end surface in FIG. 1) of the yoke 13 of the stator core 12. Projections (not shown) projecting in the axial direction are formed at a part or a plurality of positions on the inner side surface in the axial direction of the power line holding unit 60. The cross-sectional shape about the plane orthogonal to the axial direction of the protrusion is, for example, a circle or a rectangle. A hole (not shown) having a shape that matches the protrusion of the power line holding portion 60 is formed on one end surface of the yoke 13 in the axial direction. Then, the power line holding portion 60 is fixed to the stator core 12 by press-fitting the protrusion of the power line holding portion 60 into a hole formed in one end surface of the yoke 13 in the axial direction. A hole may be formed on the power line holding portion 60 side, and a protrusion that is press-fitted into the hole may be formed on the stator core 12 side.

  In a state where the power line holding portion 60 is fixed to the stator core 12, the three-phase stator coil 20 is fixed to the stator core 12 with varnish. For example, as shown in FIG. 1, the varnish is dropped from above the three-phase stator coil 20 in a state where the axial direction of the stator 10 is arranged along the vertical direction. At this time, the varnish is impregnated in the gap between the three-phase stator coil 20 and the stator core 12. And the varnish is hardened by the stator 10 being heated with a heating apparatus. As a result, the three-phase stator coil 20 is fixed to the stator core 12. At this time, the power line holding part 60 and the stator core 12 may be further fixed with varnish. After the varnish is dropped with one axial direction of the stator core 12 facing up, the varnish is dropped with the axial direction of the stator core 12 reversed, that is, with the other axial side (the lower side in FIG. 1) facing up. Also good.

  Further, in a state where the power line holding part 60 is fixed to one end face in the axial direction of the stator core 12, the power line holding part 60 is more than the range where the three-phase stator coil 20 is welded (arrow α1 in FIG. 2). Arranged in a range on the stator core 12 side in the axial direction (arrow α2 in FIG. 2). For this reason, the total length in the axial direction of the stator 10 does not increase due to the presence of the three-dimensional intersection of the power lines 50 and 53.

  Further, when the stator 10 is viewed in the axial direction as shown in FIG. 3, the power line holding portion 60 is disposed between the one-side coil end 28 and the terminals 40 u, 40 v, 40 w of each phase in the radial direction. Is done. For example, when viewed in the radial direction indicated by the alternate long and short dash line R in FIG. 3, the power line holding unit 60 includes a range in which the one side coil end 28 is disposed (arrow β1 in FIG. 3) and terminals 40 u, 40 v, and 40 w. It arrange | positions in the range (arrow (beta) 3 of FIG. 3) between the range (arrow (beta) 2 of FIG. 3). For this reason, the increase in the physique in the radial direction of the stator 10 can be suppressed.

  According to the stator 10 described above, the three-phase stator coil 20 is connected by delta connection, and there is no need to connect the two different-phase stator coils 20u, 20v, and 20w with the different-phase jumper wires. Further, at least a part of the in-phase power line 50 and the different-phase power line 53 connected to the three-phase terminals 40u, 40v, and 40w intersect with each other on the outer side in the radial direction than the one-side coil end 28 when viewed in the axial direction. doing. Accordingly, an increase in the axial height of the one-side coil end 28 can be suppressed, so that an increase in the overall axial length of the stator 10 can be suppressed.

  FIG. 9 shows power lines 54, 55, and 56 connected to the coil portions 22u, 22v, and 22w, the connecting wires 23u, 23v, 23w, 25, 26, and 27, and the terminals 40u, 40v, and 40w that constitute the stator of the comparative example. It is a schematic diagram which shows the relationship. The meanings of the symbols in FIG. 9 are the same as those in FIGS. Further, in FIG. 9, different phase crossover wires 25, 26, and 27 connecting the two different phase coil portions 22 u, 22 v, and 22 w with double straight lines are shown.

  When the three-phase stator coil 20 is connected by delta connection, it is necessary to connect two stator coils 20u, 20v, and 20w having different phases. In the comparative example shown in FIG. 9, the U-phase winding start end coil portion 22 u 1 and the V-phase winding end end coil portion 22 v 2 are connected by a first different phase crossover wire 25. The V-phase winding start end coil portion 22v1 and the W-phase winding end end coil portion 22w2 are connected by a second different phase crossover wire 26. The W-phase winding end coil portion 22 w 1 and the U-phase winding end coil portion 22 u 2 are connected by a third different phase crossover wire 27.

  Each cross-phase connecting wire 25, 26, 27 is arranged on the outer side in the axial direction of one side coil end 28 (see FIG. 1) of the three-phase stator coil 20. Then, the ends of the winding start end coil portions 22u1, 22v1, 22w1 of each phase, the different phase crossover wires 25, 26, 27 and the power lines 54, 55, 56 are connected at the positions indicated by Q1, Q2, Q3 in FIG. Is done. In this comparative example, the first different-phase connecting wire 25, the second different-phase connecting wire 26, and the third different-phase connecting wire 27 intersect at the positions indicated by T1 and T2 in FIG. 9 when viewed in the axial direction. As a result, in the comparative example, the two different crossover lines 25, 26, and 27 intersect three-dimensionally. For this reason, the axial height of the one-side coil end 28 increases, and the total axial length of the stator may increase. In this embodiment, such inconvenience can be solved.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine stator (stator), 12 Stator core, 13 Yoke, 14 Stator teeth, 20 3-phase stator coil, 20u U-phase stator coil, 20v V-phase stator coil, 20w W-phase stator coil, 21u U-phase unit coil wire, 21v V phase unit coil wire, 21w W phase unit coil wire, 22u U phase coil portion, 22v V phase coil portion, 22w W phase coil portion, 23u U phase connecting wire, 23v V phase connecting wire, 23w W phase connecting wire, 25 1st crossover wire, 26 2nd crossover wire, 27 3rd crossover wire, 28 One side coil end, 40 3 phase terminal, 40u U phase terminal, 40v V phase terminal, 40w W phase terminal, 50u 1st in phase Power line, 50v second in-phase power line, 50w third in-phase power line, 53uw first different phase power line, 53vu second different phase Force line, 53 wv third out-of-phase power line, 54, 55, 56 power line, 57a first in-phase axial direction part, 57b second in-phase axial direction part, 57c third in-phase axial direction part, 58a first out-of-phase axial direction part, 58b 2nd different phase axial direction part, 58c 3rd different phase axial direction part, 60 Power line holding | maintenance part.

Claims (1)

A stator core including an annular yoke and a plurality of teeth protruding radially inward at a plurality of circumferential positions of the yoke;
A three-phase stator coil connected by a delta connection, wherein each phase stator coil is wound around the teeth in a concentrated winding;
A three-phase terminal disposed on the outer diameter side of the stator core;
One end of each phase is connected to the terminal, and the other end of the corresponding phase is connected to the stator coil in phase with the corresponding terminal.
One end of each phase is connected to the terminal, and the corresponding terminal is provided with a different phase power line having the other end connected to the stator coil of a different phase.
At least a part of the plurality of in-phase power lines and the plurality of different-phase power lines are viewed from the one side coil end disposed outside the one end of the stator core in the axial direction when viewed in the axial direction. Is also a rotating electrical machine stator that intersects radially outside.

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