JP2012222874A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a peripheral separation distance of a connection part connecting terminals of conductor segments to each other at a coil end of a stator coil while attaching smaller size and higher efficiency.SOLUTION: A stator coil 40 is wound around a stator core 30 while having terminal parts 55a, 55b of a plurality of conductor segments 50A, 50B, inserted into slots, connected to each other by welding on one axial side of the stator core 30. The stator coil 40 includes a first connection part 57 which connects terminal parts 55A, 55b of conductor segments 50A', 50A" extended from two slots U1, U2' having an interval of 7 slot pitches to each other, and a second connection part 58 which connects terminal parts 55b, 55b of conductor segments 50B, 50B extended from two slots U2, U1' that abut inner sides of the two slots U1, U2' and have an interval of 5 slot pitches to each other. The second connection part 58 is located between the first connection part 57 and an axial end face 30b of the stator core 30.

Description

  The present invention relates to a stator of a rotating electric machine used as an electric motor or a generator in a vehicle, for example.

  Conventionally, as a stator of a rotating electrical machine, an annular stator core having a plurality of slots in the circumferential direction, and end portions of open ends of a plurality of conductor segments inserted and arranged in the slots are axial directions of the stator core. A stator winding that is connected by welding on at least one side of the stator and wound around a stator core is generally known. In Patent Documents 1 and 2, for example, a stator winding formed by using a plurality of U-shaped conductor segments including a pair of straight portions and a turn portion that connects one end portions of the straight portions. And a manufacturing method thereof.

  According to the method for manufacturing a stator winding disclosed in Patent Documents 1 and 2, first, a conductor segment is formed by inserting a pair of straight portions into different slots of the stator core by twisting and expanding a turn portion of a conductor segment. An electrical conductor consisting of Then, the conductor protrusion protruding from the slot is tilted in the circumferential direction of the stator core to form a skewed portion to form a coil end, or after forming the skewed inclined portion in advance, it is inserted into the stator core. A coil end is formed by wearing. After that, a pair of other conductor segments that are inserted into each slot in the circumferential direction and stacked in a plurality of layers in the radial direction of each slot and two predetermined end portions of conductor segments that are adjacent in the radial direction are paired as end portions. Pairs are formed and these end pairs are joined by welding to form a stator winding consisting of continuous windings.

  In the stator winding formed as described above, at the coil end, the connection portions connecting the end portions of the two conductor segments are arranged in a state aligned in the radial direction and the circumferential direction of the stator core. In the circumferential direction, the same number of connection portions as the slots are arranged at equal intervals in the circumferential direction.

JP 2008-199751 A JP 2000-299950 A

  By the way, it is strongly desired that a rotating electrical machine for a vehicle achieves both miniaturization and high efficiency. That is, in a small and high-efficiency alternator or high-voltage motor stator, while increasing the number of slots arranged in the circumferential direction of the stator core, the conductors and coils accommodated in the stator core slots It is desirable to accommodate the conductors at the end as densely as possible. Therefore, at the coil end of the stator winding, the connection portions by welding of the end portions of the two conductor segments are dense, and the distance between the weld portions (connection portions) adjacent in the circumferential direction is shortened. For this reason, it is difficult to secure a sufficient insulation distance, which may cause a short circuit. Moreover, when welding and connecting the terminal portions of the two conductor segments, it is difficult to secure a sufficient space for arranging the electrodes.

  The present invention has been made in view of the above circumstances, and in the circumferential direction of the connection portion that connects the end portions of the conductor segments at the coil ends of the stator winding while achieving both miniaturization and high efficiency. An object of the present invention is to provide a stator for a rotating electrical machine that can increase the separation distance.

  The invention according to claim 1, which has been made to solve the above-described problems, includes an annular stator core having a plurality of slots in the circumferential direction, and open end portions of a plurality of conductor segments inserted into the slots. In a stator of a rotating electrical machine, comprising: a stator winding having terminal portions connected by welding on at least one side in the axial direction of the stator core and wound around the stator core; The line includes a first connecting portion for connecting the end portions of the conductor segments extending from the two slots spaced apart by a predetermined pitch in the circumferential direction, and two wires spaced by a predetermined pitch adjacent to the inside of the two slots. A second connecting portion for connecting the end portions of the conductor segments extending from the slot, and the second connecting portion is between the first connecting portion and the axial end surface of the stator core. Being located And features.

  According to the first aspect of the present invention, the stator winding includes a first connection portion that connects the end portions of the conductor segments that extend from two slots that are separated by a predetermined pitch in the circumferential direction, and the two slots. A second connecting portion for connecting the end portions of conductor segments extending from two slots adjacent to each other at a predetermined pitch, and the second connecting portion includes a shaft of the first connecting portion and the stator core. It is located between the direction end faces. That is, the first connection portion and the second connection portion are arranged in a state of being aligned in the axial direction of the stator core. Therefore, the separation distance between the first connection parts adjacent in the circumferential direction and the second connection parts adjacent in the circumferential direction can be increased. Thereby, since sufficient insulation distance of these connection parts can be ensured, the possibility of a short circuit can be avoided. Further, when the terminal portions of the two conductor segments are welded and connected, a sufficient space for arranging the electrodes can be ensured, so that the welding operation can be easily performed.

  The invention according to claim 2 is characterized in that the first connecting portion and the second connecting portion have the same circumferential position.

  According to the second aspect of the present invention, the distance between the first connection parts adjacent in the circumferential direction and the distance between the second connection parts adjacent in the circumferential direction can be reliably increased. A sufficient insulation distance can be ensured more reliably. Moreover, when joining the 1st connection part and the 2nd connection part by welding, since an electrode can be easily arrange | positioned to an appropriate position, welding work becomes easy.

  According to a third aspect of the present invention, the interval between the first connection portions adjacent in the circumferential direction and the interval between the second connection portions adjacent in the circumferential direction are larger than the interval between the slots adjacent in the circumferential direction. It is characterized by being.

  According to the invention described in claim 3, even when the number of slots arranged in the circumferential direction of the stator core is increased to achieve high efficiency, the adjacent first connection portions adjacent in the circumferential direction and Since the insulation distance between the second connection portions can be sufficiently secured, both miniaturization and high efficiency can be achieved.

  According to a fourth aspect of the present invention, the pitch of the two slots from which the two terminal portions connected by the first connecting portion respectively extend is the two terminal portions connected by the second connecting portion. Is made larger than the pitch of the two slots which are respectively extended.

  According to invention of Claim 4, the state which the 2nd connection part is located between the 1st connection part and the axial direction end surface of a stator core, ie, the conductor segment which comprises a 1st connection part, The conductor segments constituting the second connection portion can be positioned without crossing each other, and when joining the end portions of the conductor segments during welding, the end portions are prevented from being separated due to the crossing of the conductor segments. Welding is possible.

  According to a fifth aspect of the present invention, when the pitch of the two slots extended from the two terminal portions connected at the first connection portion is k slot pitch, the two connection portions are connected at the second connection portion. The pitch of the two slots extended from the two terminal units is (k-2) slot pitch, respectively.

  According to the invention described in claim 5, the state where the second connection portion is located between the first connection portion and the axial end surface of the stator core, that is, the first connection portion and the second connection portion are The state in which the stator cores are arranged in the axial direction can be realized simply and easily, and the conductor segment constituting the first connection portion and the conductor segment constituting the second connection portion can be positioned without crossing each other. When joining the end portions of the conductor segments at the time of welding, it is possible to prevent the end portions from being separated due to the intersection of the conductor segments, thereby enabling welding reliably. The value of k is basically determined by the number of phases m of the stator winding and the slot multiple n.

  According to a sixth aspect of the present invention, the stator winding is spaced apart by a predetermined pitch adjacent to the inside of the two slots where the two end portions connected by the second connection portion respectively extend. A third connecting portion for connecting the end portions of the conductor segments extending from one slot, and the third connecting portion is provided between the second connecting portion and the axial end surface of the stator core. It is located.

  According to invention of Claim 6, a 3rd connection part is located between the 2nd connection part and the axial direction end surface of a stator core, and a 1st-3rd connection part is a stator core. It will be in a state of being aligned in the axial direction of Thereby, the separation distances of the first connection parts, the second connection parts, and the third connection parts that are adjacent in the circumferential direction are enlarged, and a sufficient insulation distance can be secured. Moreover, the possibility of a short circuit is avoided, and when the terminal portions of the two conductor segments are connected by welding, it is possible to ensure a sufficient space for arranging the electrodes. When the third connecting portion is provided as in the present invention, the above-described effects can be effectively exhibited while achieving both miniaturization and high efficiency.

  According to a seventh aspect of the present invention, in the axial end face of the stator core, the pitch of the two slots is X, m is the number of phases, n is a slot multiple, and a is a natural number equal to or less than n. The slot pitch X (a) of the connecting portion located in the a-th stage from X is X (a) = n × (m−1) + 2a−1.

  According to the seventh aspect of the present invention, the slot pitch of each connecting portion arranged in the axial direction of the stator core can be simplified by substituting the values of the phase number m and the slot multiples n and a into the above formula. And it can calculate easily. Therefore, when connecting the terminal portions of the two conductor segments by welding, it is possible to easily set the combination of the terminal portions to be connected.

  The invention according to claim 8 is characterized in that the connecting portion is provided at the center in the circumferential direction between the two slots where the two terminal portions connected by the connecting portion respectively extend. To do.

  According to the invention described in claim 8, since the axial height position of the connecting portion from the axial end surface of the stator core can be lowered, the stator winding can be miniaturized. In addition, since the terminal part of the conductor segment is usually formed at the tip of the skew part extending from the slot, if the position of the connecting part is shifted from the center in the circumferential direction, one skew part becomes long. Therefore, the height in the axial direction of the connecting portion increases accordingly.

FIG. 3 is an axial cross-sectional view schematically showing the configuration of the rotating electrical machine according to the first embodiment. FIG. 3 is a perspective view schematically illustrating a configuration of a stator of the rotating electrical machine according to the first embodiment. It is an expansion perspective view which expands and shows the principal part (range of the circle of arrow B) in FIG. FIG. 4 is a perspective view showing a unit shape of conductor segments that constitute the stator winding according to the first embodiment. It is the front view which looked at the connection state of the terminal parts of the conductor segment which comprises the U-phase coil | winding of the stator coil | winding which concerns on Embodiment 1 from the inner peripheral side of the stator core. It is the front view which looked at the connection state of the terminal parts of the conductor segment which comprises the U-phase coil | winding and V-phase coil | winding of the stator coil | winding which concern on Embodiment 1 from the inner peripheral side of the stator core. FIG. 5 is an enlarged perspective view showing a main part of a stator according to Embodiment 2 in an enlarged manner. It is the front view which looked at the connection state of the terminal parts of the conductor segment which comprises the U-phase coil | winding of the stator coil | winding which concerns on Embodiment 2 from the inner peripheral side of the stator core. It is the front view which looked at the connection state of the terminal parts of the conductor segment which comprises the U-phase coil | winding and V-phase coil | winding of the stator coil | winding which concern on Embodiment 2 from the inner peripheral side of the stator core.

  Hereinafter, an embodiment in which a stator of a rotating electrical machine according to the present invention is embodied will be specifically described with reference to the drawings.

Embodiment 1
FIG. 1 is an axial cross-sectional view schematically showing the configuration of the rotating electrical machine according to the embodiment. The rotating electrical machine 1 according to the present embodiment is used as a vehicular electric motor. As shown in FIG. 1, a pair of substantially bottomed cylindrical housing members 10a and 10b are joined at openings. The housing 10, the rotor 14 fixed to the rotary shaft 13 rotatably supported by the housing 10 via bearings 11 and 12, and the housing 10 at a position surrounding the rotor 14. And a stator 20.

  The rotor 14 has a plurality of magnetic poles arranged on the outer peripheral side facing the inner peripheral side of the stator 20 so that the polarities are alternately different at a predetermined distance in the circumferential direction. These magnetic poles are formed by a plurality of permanent magnets embedded in predetermined positions of the rotor 14. The number of magnetic poles of the rotor 14 is not limited because it varies depending on the rotating electrical machine. In this embodiment, an 8-pole rotor (N pole: 4, S pole: 4) is used.

  Next, the stator 20 will be described with reference to FIGS. FIG. 2 is a perspective view schematically showing a configuration of the stator of the rotating electrical machine according to the first embodiment. FIG. 3 is an enlarged perspective view showing an essential part in FIG. 2 in an enlarged manner. FIG. 4 is a perspective view showing a unit shape of a conductor segment constituting the stator winding according to the first embodiment. FIG. 5 is a front view of a connection state of terminal portions of conductor segments constituting one phase (U-phase) winding of the stator winding according to the first embodiment when viewed from the inner peripheral side of the stator core. is there. FIG. 6 shows the connection state between the end portions of the conductor segments constituting the two-phase (U-phase, V-phase) windings of the stator winding according to the first embodiment when viewed from the inner peripheral side of the stator core. It is a front view.

  As shown in FIGS. 2 and 3, the stator 20 includes an annular stator core 30 having a plurality of slots 31 in the circumferential direction, and terminals at the open ends of the plurality of conductor segments inserted into the slots 31. Three-phase (U-phase, V-phase, W-phase) stator windings 40 that are connected to each other by welding on one side in the axial direction of the stator core and wound around the stator core. Yes.

  The stator core 30 is configured by laminating a plurality of core sheets (steel plates) in the axial direction. The inner circumferential surface of the stator core 30 includes a plurality of slots 31 that pass through the stator core 30 in the axial direction and have a substantially rectangular cross section so as to accommodate the stator windings 40 at equal pitches in the circumferential direction. Are provided radially in the radial direction. The number of slots 31 formed in the stator core 30 is two per one phase of the stator winding 40 with respect to the number of magnetic poles of the rotor 14 (eight magnetic poles). 2. In this embodiment, since 8 × 3 × 2 = 48, the number of slots is 48.

  The slot 31 of the stator core 30 is provided with a stator winding 40 as a winding. This stator winding 40 is a three-phase winding as a multi-phase winding, and windings of the same phase are wound around two slots 31, 31 adjacent to each other, so-called two slots (two times per phase). Slot) configuration. The stator winding 40 forms a first coil end group 41 at one end of the stator core 30 in the axial direction and forms a second coil end group 42 at the other end in the axial direction. In the slot 31, conductor segments 50 constituting the stator winding 40 are accommodated in one row as electric conductors. Further, an insulating sheet (not shown) is interposed between each slot 31 and the conductor segment 50 accommodated therein.

  The stator winding 40 is configured by joining a plurality of conductor segments 50 which are electric conductors, and each slot 31 accommodates an even number of electric conductors (eight conductor segments in this embodiment). . In this embodiment, a U-shaped conductor segment 50 as shown in FIG. 4 is mainly used as the conductor segment 50 which is an electric conductor. An I-shaped conductor segment may be used.

  As shown in FIG. 4, the U-shaped conductor segment 50 has a U-shape composed of a pair of straight portions 51a and 51b and a turn portion 52 that connects one end portions of the straight portions 51a and 51b. Is adopted. The conductor segment 50 is formed by cutting a rectangular conductive wire having a rectangular cross section and bending it into a U shape to form one turn portion 52. Then, the two straight portions 51a and 51b are placed at predetermined positions in a predetermined direction. It is formed so as to have a predetermined interval (in this embodiment, 6 slot pitch).

  The conductor segment 50 includes a pair of straight portions 51a and 51b that are inserted into two slots 31 spaced apart by a predetermined slot pitch in the axial direction, and then open to the straight portions 51a and 51b that extend outward from the slot 31. The end portions are bent so as to be inclined obliquely at a predetermined angle in circumferential directions that are opposite to each other. As a result, conductor insertion portions 53 a and 53 b that are inserted in the slot 31 and skew portions 54 a and 54 b that obliquely slant outside the slot 31 are formed in the straight portions 51 a and 51 b. The end portions 55a and 55b at the tips of the inclined portions 54a and 54b are exposed by peeling off the insulating film covering the surface of the conductor, and the end portions 55a and 55b where the conductor is exposed are welded to other end portions 55a and 55b. The terminal portions 55a and 55b of the conductor segment 50 are joined. In addition, when the rising part is provided in the axial direction at the front-end | tip of skew part 54a, 54b, a conductor exposed part is formed in the terminal parts 55a, 55b of the rising part.

  In the present embodiment, the conductor segment 50 includes two types of large and small large segments 50A and 50B, and employs a pair structure in which the large segments 50A are aligned so as to surround the small segments 50B. In this case, the oblique portions 54a and 54b of the large segment 50A are inclined in the circumferential direction so as to be away from each other, and the oblique portions 54a and 54b of the small segment 50B are inclined in the circumferential direction so as to approach each other. Further, in each of the large segment 50A and the small segment 50B, the length of one skewed portion 54a is set longer by a predetermined amount than the other skewed portion 54b. One of the elongated skewed portions 54 a is connected to a first connecting portion 57 described later, and the other shortened inclined portion 54 b is connected to a second connecting portion 58.

  The pair of conductor segments 50A and 50B are sequentially inserted into the slot 31 in pairs on the outer peripheral side and the inner peripheral side of the slot 31, respectively. Since the insertion method is the same on the outer peripheral side and the inner peripheral side of the slot 31 and does not change, the case where a pair of conductor segments 50A and 50B are inserted on the inner peripheral side will be described.

  The inner layer conductor insertion portion 53a in one slot 31 has an outer layer in another slot 31 that is separated by one magnetic pole pitch (T) (6 slot pitch in this embodiment) toward the clockwise direction of the stator core 30. It is paired with the conductor insertion portion 53b. Similarly, the middle layer conductor insertion portion 53a in one slot 31 is paired with the middle layer conductor insertion portion 53b in another slot 31 that is one magnetic pole pitch (T) away from the stator core 30 in the clockwise direction. I am doing. And the conductor insertion parts 53a and 53b which make these pairs are connected by the turn part 52 continuous in the end surface 30a side of the axial direction one side (downward of FIG. 2) of the stator core 30. FIG.

  Therefore, on one end face 30a side in the axial direction of the stator core 30, the turn portion 52 of the small segment 50B connecting the two conductor insertion portions 53a and 53b in the middle layer is connected to the conductor insertion portions 53a and 53b in the inner layer and the outer layer. The turn part 52 of the large segment 50A to be connected surrounds. That is, the axial end surface 30a side of the stator core 2 is surrounded by the turn portion 52 that connects the conductor insertion portions 53a and 53b that form a pair, and the middle layer coil is connected by connecting the middle layer conductor insertion portions 53a and 53b. Ends are formed, and end layer coil ends are formed by connecting the conductor insertion portions 53a and 53b of the inner and outer layers, and the first coil end group 41 is configured by these.

  Next, the connection state of the conductor segments 50A and 50B on the other end surface 30b side in the axial direction of the stator core 30 (upper side in FIG. 2) will be described. Here, each of the three-phase windings (U-phase, V-phase, W-phase) constituting the stator winding 40 of the present embodiment has the same connection method of the conductor segments 50, and therefore, as representatives thereof. A connection state of the large segments 50A ′, 50A ″ and the small segments 50B constituting the U-phase winding will be described with reference to FIG. 5. FIG. It is the front view which looked at the connection state from the inner peripheral side of the stator core.

  In FIG. 5, two U-phase, V-phase, and W-phase slots are sequentially arranged on the inner peripheral surface of the stator core 30 so that windings having the same phase are wound around two slots 31 adjacent to each other. Is arranged. One conductor insertion portion 53a of the small segment 50B is inserted into the middle layer of the slot U1, and one skewed portion 54a is inclined clockwise from the slot U1 (right direction in FIG. 5, the same applies hereinafter). It is extended. A terminal portion 55a at the tip of the skewed portion 54a extending from the slot U1 is located at an intermediate portion between the slot V2 and the slot W1. The other conductor insertion portion 53b of the small segment 50B is inserted into the middle layer of the slot U1 ′, and the other inclined portion 54b is inclined counterclockwise (leftward in FIG. 5, the same applies hereinafter) from the slot U1 ′. It is extended in the state. A terminal portion 55b at the tip of the other skewed portion 54b extending from the slot U1 'is located between the slot V2 and the slot W1.

  One conductor insertion portion 53a of the large segment 50A ″ is inserted into the inner layer of the slot U2 ′, and one oblique portion 54a extends from the slot U2 ′ in a state of being inclined counterclockwise. The end portion 55a at the tip of the skew portion 54a extending from the slot U2 ′ extends to an intermediate position between the slot V2 and the slot W1, and is radially inward of the end portion 55b at the tip of the skew portion 54b of the small segment 50B. The two terminal portions 55a and 55b that are opposed to each other in the radial direction are joined to each other by a known TGI welding to form a first connection portion 57.

  The first connection portion 57 connects one terminal portion 55a of the small segment 50B extending from the slot U1 and one terminal portion 55a of the large segment 50A ″ extending from the slot U2 ′. The two slots U1 and U2 ′ are provided at the center in the circumferential direction between the two slots U1 and U2 ′. In this case, the pitch of the two slots U1 and U2 ′ is 7 slots. The conductor insertion portion 53b is inserted into the outer layer of another slot (not shown) spaced one magnetic pole pitch (T) in the clockwise direction.

  Further, the other conductor insertion portion 53b of the large segment 50A 'is inserted into the outer layer of the slot U2, and the other inclined portion 54b extends from the slot U2 in a state of being inclined in the clockwise direction. A terminal portion 55b at the tip of the skew portion 54b extending from the slot U2 extends to an intermediate position between the slot V2 and the slot W1, and is radially outside the terminal portion 55b at the tip of the other skew portion 54b of the small segment 50B. Located on the side. These two terminal portions 55b and 55b that face each other in the radial direction are joined to each other by known TGI welding to form a second connection portion 58. The second connecting portion 58 has the same circumferential position as the first connecting portion 57 and is located between the first connecting portion 57 and the other end face 30 b in the axial direction of the stator core 30. Note that one conductor insertion portion 53a of the large segment 50A 'is inserted in the inner layer of another slot (not shown) separated by one magnetic pole pitch (T) in the counterclockwise direction.

  The second connection portion 58 connects the other terminal portion 55b of the large segment 50A ′ extending from the slot U2 and the other terminal portion 55b of the small segment 50B extending from the slot U1 ′. It is provided at the center in the circumferential direction between the two slots U2, U1 ′. In this case, the two slots U2 and U1 ′ are adjacent to the inside of the two slots U1 and U2 ′ from which the two terminal portions 55a and 55b connected by the first connection portion 57 extend, respectively. The pitch of the slots U2, U1 ′ is 5 slot pitch. Therefore, the pitch of the two slots U1 and U2 ′ (7 slot pitch) from which the two terminal portions 55a and 55b connected by the first connecting portion 57 are extended is the pitch of the two slots U2 and U1 ′. It is larger than (5 slot pitch), and the difference is 2 slots.

  Note that the pitch of the two slots U1 and U2 ′ extended from the two terminal portions 55a and 55b connected by the first connecting portion 57 and the two terminal portions 55b and 55b connected by the second connecting portion 58 are as follows. The pitch of the two extended slots U2 and U1 ′ is such that when the pitch of the two slots is X, m is the number of phases, n is a slot multiple, and a is a natural number equal to or less than n, the stator core 30 The slot pitch X (a) of the connecting portion located at the a-th stage from the end face in the axial direction can be obtained by the following (Equation 1).

X (a) = n × (m−1) + 2a−1 (Equation 1)
As described above, the connection of the two large and small conductor segments 50A and 50B inserted into each of the U-phase slots U1 and U2 is repeatedly performed over the entire circumference of the stator core 30 to electrically A U-phase winding connected to is formed. As a result, the first connecting portion 57 and the second connecting portion 58 that are aligned in a row in the radial direction on the other end surface 30 b side in the axial direction of the stator core 30 are arranged in two stages in the axial direction of the stator core 30. The second coil end group 42 is configured by the first and second connecting portions 57 and 58 and the skewed portions 54a and 54b.

  The V-phase winding and the W-phase winding can also be formed by the same connection method as the U-phase winding. As a result, the second coil end group 42 of the stator winding 40 of the present embodiment has the first of the phase windings arranged in two stages in the axial direction of the stator core 30 as shown in FIG. And the 2nd connection parts 57 and 58 are arrange | positioned at equal intervals so that it may repeat in order of U phase, V phase, and W phase clockwise. For example, as shown in FIG. 6, when the first and second connection portions 57 and 58 of the U-phase winding and the V-phase winding that are adjacent to each other in the circumferential direction are viewed, The interval (separation distance) S1 between the one connection portions 57 and the interval S1 between the second connection portions 58 of the U-phase winding and the V-phase winding are about twice as large as the interval S2 between slots adjacent in the circumferential direction. It is getting bigger. Thereby, the separation distance S1 in the circumferential direction of the first connection portion 57 and the second connection portion 58 arranged at equal intervals in the circumferential direction is greatly increased, and a sufficient insulation distance between them is ensured.

  In the stator winding 40 of the present embodiment, a phase winding that makes two rounds around the stator core 30 is formed by two basic large and small conductor segments 50A and 50B for each phase. However, for each phase of the stator winding 40, a segment having an output lead wire and a neutral lead wire integrally, and a segment having a turn portion connecting the first and second rounds are basically The conductor segments 50 </ b> A and 50 </ b> B are formed with differently shaped segments. Using these deformed segments, the winding ends of the respective phases of the stator winding 40 are connected by star connection.

  According to the stator 20 of the present embodiment configured as described above, in the second coil end group 42, the second connection portion 58 is formed between the first connection portion 57 and the axial end surface 30 b of the stator core 30. The first connection part 57 and the second connection part 58 are arranged in a state of being arranged in the axial direction of the stator core 30. Therefore, the separation distance S1 between the first connection parts 57 adjacent in the circumferential direction and the second connection parts 58 adjacent in the circumferential direction can be increased. As a result, a sufficient insulation distance can be ensured, so that the possibility of a short circuit can be avoided. Further, when the terminal portions 55a and 55b of the two conductor segments 50 are welded and connected to each other, a sufficient space for arranging the electrodes can be ensured, so that the welding operation can be easily performed.

  Moreover, since the 1st connection part 57 and the 2nd connection part 58 have the same circumferential position, between the 1st connection parts 57 adjacent in the circumferential direction, and the 2nd connection parts 58 adjacent in the circumferential direction. Since each separation distance S1 can be expanded reliably, those sufficient insulation distances can be ensured more reliably. Further, when the first connection portion 57 and the second connection portion 58 are joined by welding, the electrodes can be easily arranged at an appropriate position, so that the welding operation is facilitated.

  In the present embodiment, the separation distance S1 between the first connection portions 57 adjacent in the circumferential direction and the separation distance S1 between the second connection portions 58 adjacent in the circumferential direction are the intervals between the slots 31 adjacent in the circumferential direction. It is larger than S2. Therefore, even when the number of slots 31 arranged in the circumferential direction of the stator core 30 is increased to achieve high efficiency, adjacent first connection portions 57 and second connection portions 58 adjacent in the circumferential direction are adjacent to each other. Therefore, it is possible to achieve both a reduction in size and an increase in efficiency.

  In the present embodiment, the pitches of the two slots U1 and U2 ′ from which the two terminal portions 55a and 55b connected by the first connecting portion 57 are extended are the two pitches connected by the second connecting portion 58, respectively. The terminal portions 55b and 55b are made larger than the pitch of the two slots U2 and U1 ′ from which the terminal portions 55b and 55b extend, respectively. Furthermore, if the pitch of the two slots U1, U2 'is k slot pitch, the pitch of the two slots U2, U1' is (k-2) slot pitch. Therefore, the state where the second connection portion 58 is located between the first connection portion 57 and the end face 30 b of the stator core 30, that is, the first connection portion 57 and the second connection portion 58 of the stator core 30. The state of being arranged in the axial direction can be realized easily and easily.

  The pitch of the two slots U1 and U2 'and the two slots U2 and U1' can be calculated easily and easily by the above (Equation 1). Therefore, when connecting the terminal portions 55a and 55b of the two conductor segments 50 by welding, it is possible to easily set the combination of the terminal portions 55a and 55b to be connected.

  In the present embodiment, the first and second connection portions 57 and 58 include two slots (U1) extended from the two terminal portions 55a and 55b connected by the first and second connection portions 57 and 58, respectively. , U2 ′) (U2, U1 ′) is provided at the center in the circumferential direction. Thereby, since the axial height position of the 1st and 2nd connection parts 57 and 58 from the axial direction end surface 30b of the stator core 30 can be made low, size reduction of the stator coil | winding 40 is attained. .

[Embodiment 2]
FIG. 7 is an enlarged perspective view showing an enlarged main part of the stator according to the second embodiment. FIG. 8 is a front view of the connection state of the end portions of the conductor segments constituting the U-phase winding of the stator winding according to the second embodiment when viewed from the inner peripheral side of the stator core. FIG. 9 is a front view of the connection state of the terminal portions of the conductor segments constituting the U-phase winding and the V-phase winding of the stator winding according to the second embodiment when viewed from the inner peripheral side of the stator core. .

  The stator 120 according to the present embodiment is different from the stator 20 according to the first embodiment in that a three-phase stator winding 140 having a slot multiple n of 3 is wound around the stator core 130. Therefore, the detailed description about the member and structure which are common in Embodiment 1 is abbreviate | omitted, and the important point different from Embodiment 1 is demonstrated.

  In the stator 120 of this embodiment, the number of magnetic poles of the rotor 14 is 8, the slot multiple n is 3, and the stator winding 140 is a three-phase winding, so that 8 × 3 × 3 = 72. Accordingly, the number of slots is 72. As the U-shaped conductor segment 60 constituting the stator winding 140, two basic large and small types of large segments 60A and small segments 60B formed of the same rectangular conductor as in the first embodiment are used. . The large segment 60 </ b> A and the small segment 60 </ b> B are set so that the length of the skewed portion 54 is three types of length (long), medium, and short. The longest set (long) skew portion 54 is connected to a first connection portion 67 to be described later, and the (medium) skew portion 54 set to a medium length is a second connection to be described later. The shortest skew portion 54 connected to the portion 68 and set to the shortest is connected to a third connection portion 69 described later.

  Also in the present embodiment, the inner layer conductor insertion portion 63a in one slot 131 is separated by one magnetic pole pitch (T) (9 slot pitch in the present embodiment) in the clockwise direction of the stator core 130. It is paired with the outer layer conductor insertion portion 63 b in another slot 131. Similarly, the middle layer conductor insertion portion 63 a in one slot 131 is paired with the middle layer conductor insertion portion 63 b in another slot 131 that is one magnetic pole pitch (T) away from the stator core 130 in the clockwise direction. I am doing. The pair of conductor insertion portions 63a and 63b are connected by a continuous turn portion 62 on one end surface 130a side in the axial direction of the stator core 130 (downward in FIG. 2). Accordingly, the first coil end group 141 is configured by the turn portion 62 of the large segment 60A and the turn portion 62 of the small segment 60B on the one end surface 130a side in the axial direction of the stator core 130.

  Next, the connection state of the conductor segments 60A and 60B on the other axial end surface 130b side of the stator core 130 will be described. Also in the case of this embodiment, the connection state of the large segment 60A and the small segment 60B constituting the U-phase winding will be described with reference to FIG.

  In the case of the present embodiment, as shown in FIG. 8, the U-phase, V-phase, and so on are wound around the inner peripheral surface of the stator core 130 in three slots 131 adjacent to each other. Three W-phase slots are arranged in order.

  One conductor insertion portion 63a of the first small segment 60B is inserted in the middle layer of the slot U1, and one skewed portion 64a from the slot U1 is inclined in the clockwise direction (right direction in FIG. 8, the same applies hereinafter). It extends in the state. A terminal portion 65a at the tip of the skew portion 64a extending from the slot U1 is located at an intermediate portion between the slot V3 and the slot W1. The other conductor insertion portion 63b of the first small segment 60B is inserted into the middle layer of the slot U1 ′, and the other skewed portion 64b extends from the slot U1 ′ in the counterclockwise direction (the left direction in FIG. 8, the same applies hereinafter). It extends in an inclined state. A terminal portion 65b at the tip of the other skewed portion 64b extending from the slot U1 'is positioned between the slot V3 and the slot W1.

  One conductor insertion portion 63a of the second small segment 60B is inserted into the middle layer of the slot U2, and one oblique portion 64a is inclined clockwise from the slot U2, so that the oblique portion of the first small segment 60B is inclined. It extends substantially parallel to 64a. The end portion 65a at the tip of the skew portion 64a extending from the slot U2 extends to an intermediate position between the slot V3 and the slot W1, and the end surface 130b side of the end portion 65a at the tip of the skew portion 64a extending from the slot U1 (FIG. 8). , Below, the same shall apply hereinafter). The other conductor insertion portion 63b of the second small segment 60B is inserted into the middle layer of the slot U2 ′, and the other inclined portion 64b of the second small segment 60B is inclined counterclockwise from the slot U2 ′. Extending substantially parallel to the skewed portion 64b. A terminal portion 65b at the tip of the other skewed portion 64b extending from the slot U2 'is located in the middle of the slot V3 and the slot W1.

  One conductor insertion portion 63a of the third small segment 60B is inserted into the middle layer of the slot U3, and one oblique portion 64a is inclined clockwise from the slot U3, so that the oblique portion of the second small segment 60B is inclined. It extends substantially parallel to 64a. The terminal portion 65a at the tip of the skew portion 64a extending from the slot U3 extends to an intermediate position between the slot V3 and the slot W1, and is located on the end surface 130b side of the terminal portion 65a at the tip of the skew portion 64a extending from the slot U3. ing. The other conductor insertion portion 63b of the third small segment 60B is inserted into the middle layer of the slot U3 'and extends from the slot U3' in a state where the other inclined portion 64b is inclined counterclockwise. A terminal portion 65b at the tip of the other skewed portion 64b extending from the slot U3 'is located between the slot V3 and the slot W1.

  In addition, one conductor insertion portion 63a of the first large segment 60A is inserted into the inner layer of the slot U3 ′, and one oblique portion 64a extends from the slot U3 ′ in a state of being inclined counterclockwise. . A terminal portion 65a at the tip of the skew portion 64a extending from the slot U3 ′ extends to an intermediate position between the slot V3 and the slot W1, and is radially inward of the terminal portion 65a at the tip of the skew portion 64a of the first small segment 60B. Located on the side. The two terminal portions 65 a and 65 a that are opposed to each other in the radial direction are joined to each other by a known TGI welding to form a first connection portion 67.

  The first connecting portion 67 connects one terminal portion 65a of the first small segment 60B extending from the slot U1 and one terminal portion 65a of the first large segment 60A extending from the slot U3 ′. And is provided at the center in the circumferential direction between the two slots U1 and U3 ′. In this case, the pitch of the two slots U1, U3 'is 11 slot pitch. The pitch of the two slots U1 and U3 'can be easily calculated by substituting the number of phases m = 3, the slot multiple n = 3, and a = 3 into (Equation 1). The other conductor insertion portion 63b of the first large segment 60A is inserted into the outer layer of another slot (not shown) that is spaced apart by one magnetic pole pitch (T) in the clockwise direction.

  One conductor insertion portion 63a of the second large segment 60A is inserted into the inner layer of the slot U2 ′, and one skewed portion 64a is inclined counterclockwise from the slot U2 ′, and the first large segment 60A. It extends almost in parallel. A terminal portion 65a at the tip of one skewed portion 64a extending from the slot U2 ′ extends to an intermediate position between the slot V3 and the slot W1 and a terminal portion 65a at the tip of one skewed portion 64a of the second small segment 60B. It is located on the radially inner side. The two terminal portions 65a and 65a facing each other in the radial direction are joined to each other by a known TGI welding to form a second connection portion 68.

  The second connection portion 68 has the same circumferential position as the first connection portion 67 and is located between the first connection portion 67 and the end face 130 b of the stator core 130. The second connection portion 68 connects one terminal portion 65a of the second small segment 60B extending from the slot U2 and one terminal portion 65a of the second large segment 60A extending from the slot U2 ′. And is provided at the center in the circumferential direction between the two slots U1 and U3 ′. In this case, the pitch of the two slots U2, U2 'is 9 slot pitch. The pitch of the two slots U2 and U2 'can be easily calculated by substituting the number of phases m = 3, the slot multiple n = 3, and a = 2 into the above (Equation 1). Note that the other conductor insertion portion 63b of the second large segment 60A is inserted into the outer layer of another slot (not shown) separated by one magnetic pole pitch (T) in the clockwise direction.

  One conductor insertion portion 63a of the third large segment 60A is inserted into the inner layer of the slot U1 ′, and one skewed portion 64a is inclined counterclockwise from the slot U1 ′, and the second large segment 60A. It extends almost in parallel. A terminal portion 65a at the tip of one skewed portion 64a extending from the slot U1 ′ extends to an intermediate position between the slot V3 and the slot W1 and a terminal portion 65a at the tip of one skewed portion 64a of the third small segment 60B. It is located on the radially inner side. The two terminal portions 65a and 65a facing each other in the radial direction are joined to each other by known TGI welding to form a third connection portion 69.

  The third connecting portion 69 has the same circumferential position as the first and second connecting portions 67 and 68, and is located between the second connecting portion 68 and the end face 130 b of the stator core 130. The third connecting portion 69 connects one terminal portion 65a of the third small segment 60B extending from the slot U3 and one terminal portion 65a of the second large segment 60A extending from the slot U1 ′. And is provided at the center in the circumferential direction between the two slots U3 and U1 ′. In this case, the pitch of the two slots U3 and U1 'is 7 slot pitch. The pitch of the two slots U3 and U1 'can be easily calculated by substituting the number of phases m = 3, the slot multiple n = 3, and a = 1 into the above (Equation 1). The other conductor insertion portion 63b of the third large segment 60A is inserted into the outer layer of another slot (not shown) spaced one magnetic pole pitch (T) in the clockwise direction.

  As described above, the connection of the two large and small conductor segments 60A, 60B inserted into each of the U-phase slots U1, U2, U3 is repeated over the entire circumference of the stator core 130. An electrically connected U-phase winding is formed. As a result, the first to third connection portions 67 to 69 aligned in a row in the radial direction on the other axial end surface 130 b side of the stator core 130 are formed in three stages in the axial direction of the stator core 130. The second coil end group 42 is configured by the first to third connection portions 67 to 69 and the skew portions 54a and 54b.

  The V-phase winding and the W-phase winding can also be formed by the same connection method as the U-phase winding. As a result, the second coil end group 142 of the stator winding 140 of the present embodiment includes the first of the phase windings arranged in three stages in the axial direction of the stator core 130 as shown in FIG. The third connection portions 67 to 69 are arranged at equal intervals so as to repeat in the order of the U phase, the V phase, and the W phase in the clockwise direction. For example, as shown in FIG. 9, when the first to third connection portions 67 to 69 of the U-phase winding and the V-phase winding that are adjacent in the circumferential direction are viewed, 1 connection portion 67 interval (separation distance) S3, U phase winding and V phase winding second connection portion 68 interval S3, U phase winding and V phase winding third connection portion 69 The interval S3 is approximately twice as large as the interval S2 between adjacent slots in the circumferential direction. Thereby, the separation distance S1 in the circumferential direction of the first connection portion 67 and the second connection portion 68 arranged at equal intervals in the circumferential direction is greatly enlarged, and a sufficient insulation distance between them is ensured.

  In the stator coil 140 of the present embodiment configured as described above, in the second coil end group 142, the third connection portion 69 is connected between the second connection portion 67 and the axial end surface 130b of the stator core 130. The first to third connection portions 67 to 69 are arranged in a state of being arranged in the axial direction of the stator core 130. Therefore, the separation distance S3 between the first connection portions 67, the second connection portions 68, and the third connection portions 69 adjacent in the circumferential direction can be increased. Thereby, since the sufficient insulation distance of the 1st-3rd connection parts 67-69 can be ensured similarly to the case of Embodiment 1, the danger of a short circuit can be avoided. Further, when the terminal portions 55a and 55b of the two conductor segments 50 are welded and connected to each other, a sufficient space for arranging the electrodes can be ensured, so that the welding operation can be easily performed.

  In particular, in the case of the present embodiment, since the third connecting portion 69 is provided, the above-described effects can be effectively exhibited while achieving both miniaturization and high efficiency.

[Other Embodiments]
The present invention is not limited to the first and second embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the first and second embodiments, the case where the number of phases m is 3, that is, the three-phase stator winding 40 has been described. However, the present invention can be applied to a multi-phase stator winding having four or more phases m. The invention can be applied.

  In the first embodiment, an example in which the slot multiple n is 2 has been described. In the second embodiment, an example in which the slot multiple n is 3, but the case in which the slot multiple n is 4 or more is also described. The present invention can be applied.

  DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 10 ... Housing, 11, 12 ... Bearing, 13 ... Rotary shaft, 14 ... Rotor, 20, 120 ... Stator, 30, 130 ... Stator core, 30a, 30b, 130a, 130b ... End face, 31, 131 ... slot, 40, 140 ... stator winding, 41, 141 ... first coil end group, 42, 142 ... second coil end group, 50, 60 ... conductor segment, 50A ... large segment, 50B ... small 60A ... 1st-3rd large segment, 60B ... 1st-3rd small segment, 51a, 51b ... Straight line part, 52, 62 ... Turn part, 53a, 53b, 63a, 63b ... Conductor insertion part, 54a, 54b, 64 ... skew section, 55a, 55b, 65a ... terminal part, 57, 67 ... first connection part, 58, 68 ... second connection part, 69 ... third Connection portion, S1 ... first connecting portions and the second connecting portions the interval between (distance), S2 ... gap slot.

Claims (8)

An annular stator core having a plurality of slots in the circumferential direction and the end portions of the open ends of the plurality of conductor segments inserted and arranged in the slots are welded to at least one side in the axial direction of the stator core. In a stator of a rotating electrical machine comprising a stator winding connected to and wound around the stator core,
The stator winding includes a first connection portion that connects terminal portions of the conductor segments extending from the two slots spaced apart by a predetermined pitch in the circumferential direction, and a predetermined pitch adjacent to the inside of the two slots. A second connection portion for connecting the end portions of the conductor segments extending from the two separate slots,
The stator of a rotating electrical machine, wherein the second connection portion is located between the first connection portion and an axial end surface of the stator core.   The stator of a rotating electrical machine according to claim 1, wherein the first connection portion and the second connection portion have the same circumferential position.   The interval between the first connection portions adjacent in the circumferential direction and the interval between the second connection portions adjacent in the circumferential direction are larger than the interval between the slots adjacent in the circumferential direction. Item 3. A rotating electrical machine stator according to Item 1 or 2.   The pitch of the two slots extended from the two terminal portions connected at the first connection portion is the two slots extended from the two terminal portions connected at the second connection portion, respectively. The stator of the rotating electric machine according to any one of claims 1 to 3, wherein the stator is larger than the pitch of the rotating electric machine.   When the pitch of the two slots extended by the two terminal portions connected by the first connecting portion is k slot pitch, the two terminal portions connected by the second connecting portion are extended. The stator of the rotating electrical machine according to any one of claims 1 to 4, wherein a pitch of the two slots is (k-2) slot pitch.   The stator winding includes the conductor extending from the two slots separated by a predetermined pitch adjacent to the inside of the two slots from which the two terminal portions connected by the second connection portion extend. It has a 3rd connection part which connects the terminal parts of a segment, and the 3rd connection part is located between the 2nd connection part and the axial direction end face of the stator core, The stator of the rotary electric machine according to any one of claims 1 to 5. The connection located at the a-th stage from the axial end surface of the stator core, where X is a pitch of the two slots, m is a phase number, n is a slot multiple, and a is a natural number equal to or less than n. Slot pitch X (a) of
X (a) = n * (m-1) + 2a-1
The stator for a rotating electrical machine according to claim 4, wherein the stator is a rotating electrical machine.   The said connection part is provided in the center of the circumferential direction between the said two slots which each of the said two terminal parts connected by the said connection part extended, The one of the Claims 1-7 characterized by the above-mentioned. The stator of the rotating electrical machine according to one item.

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