JP5397687B2 - Stator - Google Patents

Description

  The present invention includes a cylindrical stator core, a coil wound around the stator core, a coil end portion of the coil protruding from an axial end surface of the stator core, and a cover member that covers the coil end portion, The present invention relates to a stator in which a coolant for cooling a coil end portion circulates in the cover member.

  As a method for cooling the coil end portion that protrudes from the axial end surface of the stator core, a technique for cooling the coil end portion by supplying a coolant for cooling the coil end portion from above the coil end portion is known (for example, , See Patent Document 1 below). In the configuration described in Patent Document 1, a tank-like part for storing a refrigerant for cooling the coil end part is installed on the peripheral wall surface above the coil end part, and a refrigerant supply port is provided at both circumferential ends of the tank-like part. It is done. The refrigerant is distributed and supplied from both sides of the tank-like portion to both sides of the peripheral wall surface above the coil end portion. By providing the tank-like portion, the refrigerant is supplied to both sides with a stable distribution rate. Then, the supplied refrigerant flows downward along the peripheral wall surfaces on both sides of the coil end portion according to gravity, and the coil end portion is exchanged by heat exchange with the refrigerant performed before dropping from the coil end portion. To be cooled.

JP 2005-229672 A

  However, in Patent Document 1, the refrigerant is configured to flow downward along the peripheral wall surface of the coil end portion by gravity, but special control is performed with respect to the refrigerant flow passage and the circulation amount flowing through the peripheral wall surface. Absent. Therefore, the refrigerant may not be uniformly supplied to the peripheral wall surface of the coil end part depending on the shape of the coil end part or the flow path of the refrigerant due to gravity. In particular, when a coil using a rectangular conductor 26 having a rectangular cross section is adopted to improve the space factor of the coil, the coil end is not an integral part and has many gaps depending on the molded shape. Is difficult to spread over the entire surface of the coil end portion.

  When the cover member that covers the coil end portion is provided, the refrigerant may flow along the inner surface of the cover member, and the refrigerant flowing in this way falls without contacting the surface of the coil end portion. The problem which does not function for cooling of a coil end part arises.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to supply a coolant to the coil end portion using a cover member provided so as to cover the coil end portion, and to appropriately apply the coil end portion. It is in providing the stator which can cool.

  In order to achieve the above object, a cylindrical stator core, a coil wound around the stator core, a coil end portion of the coil protruding from an axial end surface of the stator core, and the coil end portion are provided. And a cover member that covers the stator, the interphase insulating sheet inserted between the conductors of different phases constituting the coil end portion is arranged so as to extend in the circumferential direction and the axial direction, A plurality of axial sheet projections projecting from the axial end face of the coil end portion in the axial direction by a predetermined amount are arranged in the radial direction in a positional relationship overlapping when viewed from the radial direction, and the cover member includes the coil end portion A convex portion extending in the circumferential direction and projecting in the axial direction and extending in the circumferential direction on the inner surface facing the axial end surface of the shaft A plurality of concave portions that retreat in the direction and a shaft end uneven portion formed alternately in the radial direction, and the tip of the axial sheet protruding portion is inserted into the concave portion, and the axial sheet protruding portion Is disposed with a first gap with respect to the shaft end uneven portion, and the tip of the convex portion is inserted between two axial sheet projecting portions adjacent in the radial direction, and the convex portion A tip of the coil end portion is disposed with a second gap with respect to an axial end surface of the coil end portion, and the first gap and the second gap are a refrigerant flow passage through which a refrigerant for cooling the coil end portion flows. It is in the point.

According to the above characteristic configuration, the shaft end uneven portion is formed on the shaft end inner surface of the cover member, the tip of the axial sheet protrusion is inserted into the concave portion, and the tip of the convex portion is adjacent in the radial direction. Since it is inserted between the two axial sheet protrusions, the cover member shaft is compared to the case where the axial end inner surface of the cover member is a flat surface despite the presence of the axial sheet protrusion. The distance (gap) between the end inner surface and the axial end surface of the coil end portion can be reduced. Thereby, the quantity which the refrigerant | coolant which flows along the axial end inner surface of a cover member contacts the axial direction end surface of a coil end part can be increased, Therefore The cooling efficiency of the axial direction end surface of a coil end part can be improved.
Further, according to the above-described characteristic configuration, the axial sheet protrusions protruding in the axial direction toward the cover member and the convex portions protruding in the axial direction toward the coil end portion are alternately arranged along the radial direction. The refrigerant flow passage having a predetermined flow path width meandering along the radial direction is formed by the first gap and the second gap. Thus, the flow rate of the refrigerant flowing in the radial direction through the gap between the axial end surface of the cover member and the axial end surface of the coil end portion can be appropriately adjusted, and the amount of refrigerant flowing in the radial direction through the gap, The ratio with the quantity of the refrigerant | coolant which flows into the circumferential direction along an axial end uneven | corrugated | grooved part or an axial direction sheet | seat protrusion part can be adjusted appropriately. Accordingly, it is possible to appropriately cool the axial end surface of the coil end portion.

  Here, the stator core has a plurality of slots provided along a circumferential direction, and the coil end portion includes an axial conductor portion extending in an axial direction from a slot conductor portion inserted in each slot; A circumferential conductor portion that connects the two axial conductor portions by connecting different slots in the circumferential direction, and the convex portion of the shaft end uneven portion is seen from the axial direction, the circumferential conductor portion It is preferable that the shape corresponds to the shape of the end face in the axial direction.

  According to this configuration, the convex portion of the shaft end uneven portion can be shaped to correspond to the axial end surface of the coil end portion mainly composed of the circumferential conductor portion. Thereby, the said 2nd clearance gap which is a clearance gap between the convex-shaped part formed in the axial end inner surface of a cover member, and the axial direction end surface of a coil end part can be set appropriately over the circumferential direction whole region of a coil end part. . Therefore, the axial end surface of the coil end portion can be appropriately cooled. When the interphase insulating sheet is disposed between two circumferential conductor portions adjacent to each other, the tip of the axial sheet protruding portion of the interphase insulating sheet is inserted into the concave portion, and the axial sheet The shaft end uneven portion and the axial sheet protrusion can be appropriately arranged so that the convex portion is inserted between the protrusions. Therefore, the refrigerant flow passage by the first gap and the second gap can be appropriately formed over the entire circumferential direction of the coil end portion.

  Also, a radial sheet in which a plurality of radially arranged outer peripheral phase interphase insulating sheets, which are arranged on the outermost peripheral side, project a predetermined amount radially outward from the outer peripheral surface of the coil end portion. The cover member has a concave shape on the inner peripheral surface which is a concave portion extending in the axial direction and retracted in the radial direction on the inner peripheral surface of the cover which is an inner peripheral surface facing the outer peripheral surface of the coil end portion. It is preferable that the distal end of the radial sheet protruding portion is inserted into the inner peripheral surface concave portion.

According to this configuration, the refrigerant flowing in the circumferential direction along the inner peripheral surface of the cover is blocked by the radial sheet protrusion, and flows toward the coil end portion disposed radially inward from the inner peripheral surface of the cover. More specifically, the refrigerant blocked by the radial sheet protrusion flows radially inward along the radial sheet protrusion and is supplied to the outer peripheral portion of the coil end portion. Alternatively, the dammed refrigerant flows along the radial sheet protrusion to the inner surface of the axial end of the cover member in the axial direction, and is supplied to the axial end surface of the coil end portion. Further, the refrigerant that has flowed to the inner surface of the shaft end spreads over a wide range of the coil end portion through a refrigerant flow passage formed by the shaft end uneven portion and the axial sheet protruding portion.
In addition, since the tip of the radial sheet protrusion is inserted into the concave portion of the inner peripheral surface of the cover, the rate at which the refrigerant flowing in the circumferential direction along the inner peripheral surface of the cover can be blocked is increased. Can do.

  In addition, the interphase insulating sheet is arranged such that a tip on the stator core side has a third gap with respect to an axial end surface of the stator core, and a refrigerant for cooling the coil end portion flows through the third gap. A refrigerant flow passage is preferred.

  According to this configuration, the third gap can be used as a refrigerant flow passage through which the refrigerant supplied from the radially inner side to the radially outer side flows. Therefore, the refrigerant supplied from the radially inner side to the radially outer side can be guided to the cover inner peripheral surface which is the inner peripheral surface of the cover member, and is formed by the first gap and the second gap therefrom. It becomes possible to supply the refrigerant to the entire coil end portion via the refrigerant flow passage or the like. Therefore, the cooling efficiency of the coil end portion can be further increased.

  Further, it is preferable that the cover member has a refrigerant supply part for supplying a refrigerant to the inner surface of the shaft end.

  According to this configuration, the coolant is supplied to the inner surface of the shaft end of the cover member, and the coolant is appropriately supplied to the axial end surface of the coil end portion through the coolant flow passage formed by the first gap and the second gap. Can be supplied. Accordingly, it is possible to appropriately cool the axial end surface of the coil end portion.

  Further, it is preferable that the inner surface of the shaft end is arranged in a direction intersecting with a horizontal plane, and the refrigerant supply unit has a refrigerant supply opening provided at the uppermost portion of the inner surface of the shaft end. .

  According to this configuration, the coolant is supplied from the coolant supply opening provided on the uppermost portion of the inner surface of the shaft end of the cover member. And the refrigerant | coolant supplied from the said opening part flows below by gravity, and is guide | induced to the refrigerant | coolant flow path formed of said 1st clearance gap and said 2nd clearance gap. Accordingly, the coolant can be appropriately supplied to the axial end surface of the coil end portion, and the axial end surface of the coil end portion can be appropriately cooled.

  Further, it is preferable that the cover member has an inner opening on a radially inner side, and the inner opening is formed so as to pass a refrigerant supplied from a radially inner side of the cover member.

  According to this configuration, the refrigerant supplied from the radially inner side of the cover member passes through the inner opening of the cover member, is supplied to the coil end portion covered by the cover member, and further, the inner peripheral surface of the cover member Is distributed to the inner peripheral surface of the cover and the inner surface of the shaft end. Therefore, it becomes easy to supply a refrigerant | coolant to the whole coil end part, and the cooling efficiency of a coil end part can further be improved.

It is an axial section sectional perspective view of a stator concerning an embodiment of the present invention. It is an axial section sectional perspective view of a stator concerning an embodiment of the present invention. It is a perspective view of the stator which concerns on embodiment of this invention. It is a perspective view of the stator which concerns on embodiment of this invention. It is a perspective view of a stator in the state where a cover member was removed. It is an axial view of the cover member in the state where the interphase insulating sheet is inserted. It is an axial view of a cover member. It is a perspective view of a cover member. It is a perspective view of a cover member. It is a perspective view of a stator in the state where a cover member was removed. It is an axial view of the cover member in the state where the interphase insulating sheet is inserted.

  Embodiments of a stator according to the present invention will be described with reference to the drawings. Here, a case where the present invention is applied to an inner rotor type stator for a rotating electrical machine will be described as an example. The stator 20 according to the present embodiment is provided between the axial end surface 24 of the coil end portion 23 and the axial end inner surface 28 of the cover member 25 between the axial sheet protruding portion 40 of the interphase insulating sheet 27 and the axial end inner surface 28. A feature is that a predetermined refrigerant flow passage is formed between the coil end portion 23 and the cover member 25 by the formed shaft end uneven portion 45 and the like. Hereinafter, the configuration of the stator 20 according to the present embodiment will be described in detail with reference to FIGS. 1 to 11. In the following description, the axial direction, the circumferential direction, and the radial direction are defined with reference to the central axis of the stator 20 unless otherwise specified. Further, “upper” indicates the upper part in the vertical direction, and “lower” indicates the lower part in the vertical direction.

1. Configuration of Stator As shown in FIGS. 1 to 4, the stator 20 includes, as main components, a cylindrical stator core 21, a coil 22 wound around the stator core 21, and an axial end surface 29 of the stator core 21. And a cover member 25 that covers the coil end portion 23. The stator 20 can generate a magnetic field by passing a current through the coil 22 wound around the stator core 21. Although not shown, a rotor as a field magnet including a permanent magnet or an electromagnet is disposed on the radially inner side of the stator core 21 so as to be rotatable relative to the stator core 21. That is, the stator 20 according to the present embodiment is an inner rotor type rotating field type stator for a rotating electrical machine. Here, the “rotary electric machine” is used as a concept including any of a motor (electric motor), a generator (generator), and a motor / generator functioning as both a motor and a generator as necessary.

1-1. Configuration of Stator Core As shown in FIGS. 2 and 3, the stator core 21 has a cylindrical shape. Here, the stator core 21 is a laminated structure in which a plurality of annular plate-shaped electromagnetic steel plates are laminated. A plurality of slots 50 extending in the axial direction are provided on the inner circumferential surface of the stator core 21 at predetermined intervals along the circumferential direction. Each slot 50 has the same cross-sectional shape, and has a predetermined width and depth and is open to the inner peripheral surface side. In the present embodiment, the stator core 21 is provided with 48 slots 50 on the entire circumference thereof. As shown in FIGS. 2 and 5, the coil 22 is wound around each of the slots 50, and the coil end portion 23 is formed by the portion of the coil 22 protruding from the axial end surface 24 of the stator core 21.

1-2. Coil Configuration As shown in FIGS. 2 and 5, the coil 22 has a plurality of slot conductor portions 51 inserted into the slots 50 of the stator core 21 and the coil end portion 23. The shape of the coil end portion 23 is different at both axial end portions. In the description of this embodiment, unless otherwise specified, the coil end portion 23 refers to a coil end portion on one axial side (the upper right side in FIG. 2 and the lower left side in FIG. 5). The coil end portion 23 of the coil 22 includes an axial conductor portion 52 extending substantially in the axial direction from the slot conductor portion 31 and a circumferential direction connecting the two axial conductor portions 52 to each other by connecting different slots in the circumferential direction. And a conductor portion 53.

  In the present embodiment, the coil 22 is formed in advance in a predetermined shape that can be wound around the stator core 21. As shown in FIG. 2, each slot 50 of the stator core 21 has a linear shape that forms the coil 22. A plurality of conductors 26 are inserted. In this example, six linear conductors 26 are inserted in each slot 50. In this example, the linear conductor 26 forming the coil 22 has a rectangular cross section. The linear conductor 26 is the conductor 26 in the present invention. In the slot conductor portion 51, six linear conductors 26 are arranged in a line in the radial direction inside the slot 50.

1-3. Configuration of Coil End Part And, the linear conductor part 52 of the coil end part 23 is constituted by the linear conductor 26 that extends in the axial direction continuously from the slot conductor part 51 and protrudes from the stator core 21 in the substantially axial direction. ing. And in the axial direction conductor part 52, as shown in FIG.5 and FIG.10, the two linear conductors 26 arrange | positioned mutually adjacent to radial direction inside the slot 50 are the axial direction end surfaces of a stator core. 29 at a predetermined distance in the axial direction from 29, it is bent so that the arrangement of two rows overlapped so as to be adjacent in the radial direction inside the slot 50 becomes the arrangement of two rows overlapped so as to be adjacent in the circumferential direction. Is formed. Six sets of the six linear conductors 26 arranged in the same slot 50 are bent in the same manner in the axial direction conductor portion 52, two by two adjacent to each other.

  In the present embodiment, the rotating electrical machine is a rotating electrical machine driven by a three-phase alternating current, and the coil 22 is also formed in a three-phase configuration (U phase, V phase, W phase). Then, six linear conductors 26 of the same phase are inserted into two adjacent slots. The linear conductors 26 for each phase are repeatedly arranged in the circumferential direction in the order of three phases for every two adjacent slots. Therefore, two adjacent slots of the same phase are repeatedly arranged with four slots corresponding to two different phases in the circumferential direction. The circumferential conductor 53 has one of the axial conductors 52 extending from two adjacent slots of the same phase and the same phase as the two slots, and separates the four slots in the circumferential direction. The linear conductor 26 is formed by connecting, in the circumferential direction, one of the axial conductor portions 52 extending from two adjacent slots.

  As shown in FIGS. 5 and 10, linear conductors 26 are arranged at the same position in the circumferential direction between two adjacent slots of the same phase, and are adjacent to each other in the radial direction in the respective slots. Four axial conductor portions 52 corresponding to a total of four linear conductors 26, which are arranged linear conductors 26, are arranged in a circumferential direction at a predetermined distance from the axial end surface 29 of the stator core in the axial direction. It is formed by bending so as to be arranged in four rows that are overlapped so as to be adjacent to each other. Then, the four circumferential conductor portions 53 are formed by bending in the circumferential direction so that the four axial conductor portions 52 are arranged in four rows so as to be adjacent to each other in the axial direction. From a total of twelve linear conductors 26 inserted into two adjacent slots of the same phase, three sets formed by bending four pieces are arranged in the radial direction.

  Therefore, the four linear conductors 26 of the same phase are arranged so as to extend in the circumferential direction and the axial direction in the axial direction conductor portion 52 and the circumferential direction conductor portion 53. That is, the four linear conductors 26 of the same phase are formed so that the outer shape thereof is an arc plate shape curved in the radial direction along the outer peripheral surface of the coil end portion 23. In this example, such a set of four arcuate plate-like linear conductors 26 (hereinafter referred to as “arc plate-like conductor portion 46”) has a length corresponding to the circumferential length of eight slots, It is formed extending in the direction. The arcuate plate-like conductor portion 46 is formed to extend from the axial end surface 29 of the stator core to the outside in the axial direction by the width of the four rows of circumferential conductor portions 53 overlapping in the axial direction. Therefore, the end face in the axial direction of the arcuate plate-like conductor portion 46 is formed by the circumferential conductor portion 53 in the outermost row in the axial direction. Here, the outside in the axial direction refers to the side opposite to the stator core side from the axial end surface of the stator core. In addition, this one arc plate-like conductor portion 46 uses four linear conductors 26 from two adjacent slots of the same phase, and a total of 12 wires are provided in two adjacent slots of the same phase. Since the conductors 26 are arranged, three arc plate conductor portions 46 of the same phase are formed for two adjacent slots of the same phase. Therefore, three arc-shaped plate-like conductor portions 46 of the same phase are formed so as to overlap each other when viewed from the radial direction.

  Similarly, arc-shaped plate-like conductor portions 46 for each phase are formed for all slots. Six arc-shaped plate-like conductor portions 46 of two different phases are arranged so as to alternately overlap in the radial direction. Therefore, the two arcuate plate-like conductor portions 46 that are adjacently overlapped in the radial direction have different phases. Three arc-shaped plate-like conductor portions 46 having different phases are arranged so as to be shifted by 4 slots in the circumferential direction. Three arc-shaped plate-like conductor portions 46 of different phases corresponding to all slots are arranged so as to overlap with each other in the radial direction over the entire circumference while being shifted by four slots in the circumferential direction. Yes. Since the circular plate conductor portions 46 of one phase (here, V phase) are arranged in a cylindrical shape over the entire circumference, a radial step is formed at the center in the circumferential direction. Further, the two arcuate plate-like conductor portions 46 adjacent to each other in the circumferential direction are arranged so that the phases are different from each other. Therefore, the arcuate plate-like conductor portions 46 adjacent to each other in the radial direction and the circumferential direction are arranged so that the phases are different from each other. An interphase insulating sheet 27 described later is inserted between the linear conductors 26 constituting the arc-shaped plate-like conductor portions 46 having different phases.

  As described above, the linear conductors 26 constituting the coil end portion 23 are formed to extend from the slots 50 arranged at predetermined intervals in the circumferential direction, and the rectangular cross section of the linear conductor 26 has a predetermined direction. Therefore, there are relatively many gaps. Further, a gap corresponding to the circumferential arrangement interval of the slots 22 is provided between the two arcuate plate-like conductor portions 46 adjacent in the circumferential direction.

1-4. Configuration of Interphase Insulating Sheet In order to ensure electrical insulation between the linear conductors 26 of different phases constituting the coil end portion 23, as shown in FIGS. 1 and 5, the linear conductors 26 of different phases are used. The interphase insulating sheet 27 is interposed between the two adjacent to each other. As the interphase insulating sheet 27, for example, a sheet formed of a material having high electrical insulation and heat resistance such as a laminate of aramid fiber and polyethylene terephthalate can be used. In the present embodiment, as described above, the linear conductor 26 of the coil end portion 23 is formed by the four linear conductors 26 of the same phase and has a shape extending by a predetermined width in the circumferential direction and the axial direction. It forms so that the part 46 may be comprised. A plurality of arc-shaped plate-like conductor portions 46 are formed and arranged adjacent to each other in the radial direction and the circumferential direction so that the phases are different from each other. Therefore, the interphase insulating sheet 27 has a shape that extends in the circumferential direction and the axial direction and is curved in the radial direction so as to correspond to the shape of the arcuate plate-like conductor portion 46. The interphase insulating sheets 27 are inserted between the linear conductors 26 of the arc-shaped plate-like conductor portions 46 of different phases, and a plurality of sheets are arranged in the radial direction so as to overlap when viewed from the radial direction. In this example, six arc-shaped plate-like conductor portions 46 are overlapped in the radial direction, and the interphase insulating sheets are inserted one by one between two adjacent arc-shaped plate-like conductor portions 46, for a total of 5 in the radial direction. Sheets are arranged. Further, in this example, the interphase insulating sheet 27 extending in the circumferential direction and the axial direction has a length corresponding to the circumferential length of four slots and is arranged extending in the circumferential direction. This corresponds to the fact that the arc-shaped plate-like conductor portions 46 of different phases are arranged so as to be shifted and overlapped by 4 slots in the circumferential direction.

  In this example, the two arcuate plate-like conductor portions 46 adjacent to each other in the circumferential direction are in different phases, and the interphase insulating sheet 27 is disposed in the gap so as to extend in the radial direction and the axial direction. ing. The interphase insulating sheet 27 extending in the radial direction and the axial direction is formed by bending the circumferential end of the interphase insulating sheet 27 extending in the circumferential direction and the axial direction in the radial direction. The interphase insulating sheet 27 in a certain part is formed by bending a single sheet a plurality of times, and a sheet part extending in the circumferential direction and the axial direction and a sheet part extending in the radial direction and the axial direction are alternately turned a plurality of times. It is repeated and formed in a substantially rectangular wave shape when viewed from the axial direction.

  As shown in FIGS. 1 and 5, the interphase insulating sheet 27 extending in the circumferential direction and the axial direction is provided so as to have an axial sheet protruding portion 40 that protrudes a predetermined amount in the axial direction from the axial end surface 24 of the coil end portion. It is done. And as shown in FIG. 1, the front-end | tip of the axial direction sheet | seat protrusion part 40 is inserted in the recessed part 42 formed in the axial end inner surface 28 of the cover member 25 mentioned later. Further, in this state, the axial sheet protruding portion 40 is disposed with a first gap 43 with respect to the shaft end uneven portion 45 formed on the shaft end inner surface 28 of the cover member 25 described later. The shaft end inner surface 28 of the cover member 25 is disposed at a position separated from the axial end surface 24 of the coil end portion 23 by a predetermined distance in the axial direction, as will be described later. Therefore, the axial sheet protruding portion 40 has a space for forming the first gap 43 with respect to the bottom surface of the concave portion 42 of the shaft end uneven portion 45 formed at the tip end of the shaft end inner surface 28 of the cover member 25. It is arranged at a position apart from the sky. The first gap 43 serves as a refrigerant flow passage through which a refrigerant for cooling the coil end portion 23 flows, as will be described later.

  As shown in FIG. 5, in the present embodiment, the interphase insulating sheet 27 is disposed so as to extend by a predetermined width in the circumferential direction and the axial direction in accordance with the shape of the arcuate plate-like conductor portion 46 as described above. ing. Further, the interphase insulating sheet 27 has an axial sheet protruding portion 40 disposed so as to protrude from the axial end surface 24 of the arc-shaped plate-like conductor portion 46 by a predetermined amount in the axial direction. The interphase insulating sheet 27 (including a radial sheet protrusion 61 described later) that is inserted between two arcuate plate-like conductor portions 46 adjacent in the circumferential direction and extends in the radial direction and the axial direction is also the same. The arc-shaped plate-like conductor portion 46 is disposed so as to protrude from the axial end surface 24 and extend in a predetermined amount in the axial direction.

  Similarly to the portion inserted between the arcuate plate-like conductor portions 46 in the interphase insulating sheet 27, five axial sheet protrusions 40 are arranged in the radial direction so as to overlap when viewed from the radial direction. As shown in FIG. 1, two axial sheet protrusions 40 adjacent in the radial direction are formed in the radial direction of the linear conductor 26 sandwiched between the two interphase insulating sheets 27 (the stator radial direction). ) With a gap in the radial direction corresponding to the width of. The axially inner surface (stator core 21 side) of the space formed by the gap between the two axial sheet projecting portions 40 is formed by the axial end surface 24 of the arcuate plate-like conductor portion 46. The axial end surface 24 is the axial end surface 24 of the circumferential conductor portion 53 located on the outermost side in the axial direction. Therefore, the space formed between the two axial sheet protrusions 40 is continuously formed in the circumferential direction. From the above, between the two axial sheet protrusions 40 adjacent in the radial direction, the radial width of the linear conductor 26 in the radial direction, and the height of the predetermined protrusion amount in the axial direction, A gap extending continuously in the circumferential direction is formed. In this example, the gap is continuous in the circumferential direction with a length corresponding to the circumferential length of four slots. Further, the gap extending continuously in the circumferential direction is formed in four layers in the radial direction so as to overlap with each other when viewed from the radial direction, depending on the arrangement position of the arc-shaped coil end portion 23 and the interphase insulating sheet 27 described above. At the same time, it is formed over the entire circumference of the coil end portion 23. In addition, as shown in FIG. 1, the convex part 41 of the cover member 25 mentioned later is inserted into the said clearance gap from the axial direction outer side in the clearance gap continuously extended in this circumferential direction. In this state, the tip of the convex portion 41 is disposed with a second gap 44 with respect to the axial end surface 24 of the coil end portion 23. The convex portion 41 is molded into a shape corresponding to the shape of the axial end face 24 of the circumferential conductor portion 53 as viewed from the axial direction, that is, a shape corresponding to the shape of the gap between the two axial sheet projecting portions 40. Has been. Therefore, a second gap 44 is formed that is surrounded on four sides and extends continuously in the circumferential direction. The second gap 44 is also a refrigerant flow passage through which the refrigerant for cooling the coil end portion 23 flows together with the first gap 43.

  Further, the axial sheet protrusion 40 and the circumferential conductor 53 arranged at the outermost radial direction and the axial end inner surface 28 of the cover member 25 described later are surrounded on three sides and continuously extend in the circumferential direction. Grooves are formed. The groove serves as a refrigerant flow passage through which a refrigerant that cools the coil end portion 23 flows. Similarly, the innermost radial direction is surrounded on three sides by the axial sheet protruding portion 40 and the circumferential conductor portion 53 disposed on the innermost radial direction, and an axial end inner surface 28 of the cover member 25 described later. A groove extending continuously in the circumferential direction is formed to serve as a refrigerant flow path.

  As shown in FIG. 5 and FIG. 6, the outer peripheral side interphase insulating sheet 60 that is the interphase insulating sheet 27 arranged at the outermost radial direction, that is, the outermost peripheral side among a plurality of the radial arrays is arranged in the coil end portion. 23 is disposed so as to have a radial sheet protruding portion 61 that protrudes a predetermined amount from the outer peripheral surface of the outer peripheral surface radially outward. Here, the outer peripheral surface of the coil end portion 23 is a surface obtained by connecting the outermost peripheral surfaces of the plurality of linear conductors 26 constituting the coil end portion 23 in this example. In the present embodiment, as shown in FIGS. 5 and 10, the interphase insulating sheet 27 disposed so as to be in contact with the radially inner side of the arcuate plate-like conductor portion 46 on the outermost radial direction is the arcuate plate-like conductor portion 46. Is disposed so as to have a radial sheet protrusion 61 that protrudes by a predetermined amount radially outward from the radially outer surface (outer peripheral surface). Similarly to the axial sheet protrusion 40, the radial sheet protrusion 61 is disposed so as to protrude a predetermined amount in the axial direction from the axial end surface 24 of the arcuate plate-like conductor portion 46. In this example, the radial sheet protrusion 61 is formed by bending the circumferential end of the outer peripheral side interphase insulating sheet 60 outward in the radial direction.

  The distal end of the radial sheet protruding portion 61 is inserted into an inner peripheral surface concave portion 63 formed on a cover inner peripheral surface 62 of the cover member 25 described later. Therefore, the cover inner peripheral surface 62 of the cover member 25 is partitioned at a predetermined position in the circumferential direction by the radial sheet protrusion 61 extending in the radial direction and the axial direction. As shown in FIG. 6, a plurality of radial sheet protrusions 61 and inner peripheral surface concave portions 63 are arranged along the circumferential direction of the coil end portion 23. Then, the flow of the refrigerant flowing in the circumferential direction through the cover inner peripheral surface 62 of the cover member 25 is blocked by the radial sheet protrusion 61 at a plurality of predetermined positions in the circumferential direction. The refrigerant thus dammed flows inward in the radial direction along the radial sheet protrusion 61 and flows to the coil end portion 23 on the outer peripheral surface side of the coil end portion. Alternatively, the dammed refrigerant flows axially outward along the radial sheet protrusion 61 and is distributed to the shaft end inner surface 28.

  The interphase insulating sheet 27 is arranged such that the end on the stator core 21 side has a third gap 70 with respect to the axial end surface 29 of the stator core. In the present embodiment, as shown in FIGS. 1 and 5, the arcuate plate-like conductor portion 46 is formed from a position that is separated from the axial end surface 29 of the stator core 21 by a predetermined distance in the axial direction. The interphase insulating sheet 27 is also arranged at a predetermined distance from the axial end surface 29 of the stator core 21. As a result, the gap between the axial end surface 29 of the stator core 21 and the interphase insulating sheet 27 becomes the third gap. And this 3rd clearance gap 70 is formed over the perimeter of the coil end part 23 according to arrangement | positioning of the arc-shaped coil end part 23 and the phase insulation sheet 27 which were mentioned above. In addition, although the axial conductor portion 52 is disposed in the third gap 70, the axial conductor portion 52 extends from the slot 50 disposed at a predetermined interval in the circumferential direction. A large number of gaps (hereinafter referred to as “inter-conductor gaps”) are provided between the linear conductors 26 over the entire circumference. And since the axial direction conductor part 52 is extended and comprised from the six linear conductors 26 in the slot 50 arrange | positioned in a row so that it may mutually adjoin to radial direction, it is connected to radial direction. There is a gap between conductors. Accordingly, in the third gap 70 arranged over the entire circumference, a large number of inter-conductor gaps communicating in the radial direction are arranged over the entire circumference. And in this embodiment, this 3rd clearance gap 70 is also made into the refrigerant | coolant flow path through which the refrigerant | coolant which cools a coil end part distribute | circulates.

1-5. Configuration of Cover Member As shown in FIGS. 1 to 3, the cover member 25 is a member that covers the coil end portion 23 of the coil 22 protruding from the axial end surface 29 of the stator core 21. The cover member 25 is formed in a double cylindrical shape whose one end in the axial direction is closed. In this example, the cover member 25 is configured to cover only the coil end portion 23 on one axial side. As shown in FIGS. 3 and 9, the cover member 25 includes a mounting wall portion 82, a tank-shaped portion 81, an outer peripheral wall portion 74, an end wall portion 75, and an inner peripheral wall portion 78. The mounting wall portion 82 is formed with a mounting hole for inserting a fastening bolt (not shown). Using this mounting hole, the cover member 25 is fixed to the case (not shown) together with the stator core 21 by fastening bolts (not shown). As shown in FIG. 2, the coil end portion 23 is accommodated in the accommodation chamber 73 that is a space defined by the inner surface of the cover member 25. The cover member 25 includes an inner opening 72 on the radially inner side, and the accommodation chamber 73 communicates with a space on the radially inner side (rotor side) of the cover member 25. The cover member 25 is formed of an insulating material such as resin.

  The tank-shaped part 81 has an upward opening as shown in FIGS. In the present embodiment, the tank-shaped portion 81 is formed at the top of the outer peripheral wall portion 74 with the outer peripheral wall portion 74 as the bottom of the tank-shaped portion 81. At the bottom of the tank-shaped part 81, an opening 71 for supplying refrigerant is provided that communicates the storage chamber 73 formed inside the cover member 25 and the tank-shaped part 81.

  As shown in FIG. 3, the outer peripheral wall portion 74 is formed in a cylindrical shape that covers the outer peripheral surface of the coil end portion 23 over the entire periphery. The outer peripheral wall portion 74 has a cover inner peripheral surface 62 that is an inner peripheral surface facing the outer peripheral surface of the coil end portion 23. The outer peripheral wall 74 is formed with a predetermined gap between the cover inner peripheral surface 62 and the outer peripheral surface of the coil end portion 23. And this clearance gap is made into the refrigerant | coolant flow path through which the refrigerant | coolant which cools the coil end part 23 distribute | circulates. The outer peripheral wall portion 74 is formed so as to have an axial length longer than the axial length of the coil end portion 23, and is formed so as to cover the entire area in the axial direction on the outer peripheral surface of the coil end portion 23. .

  As shown in FIGS. 2 and 3, the end wall portion 75 extends from the axially outer end portion of the outer peripheral wall portion 74 toward the radial inner side, and covers the axial end surface 24 of the coil end portion 23. It is formed in a plate shape. The end wall portion 75 has a shaft end inner surface 28 that is an inner surface facing the axial end surface 24 of the coil end portion 23. Further, the end wall portion 75 is formed with a predetermined gap between the shaft end inner surface 28 and the axial end surface 24 of the coil end portion 23. In the present embodiment, the end wall portion 75 has a protruding end wall portion 76 protruding outward in the axial direction over a predetermined circumferential width in a part of the circumferential direction, and the protruding end wall portion 76. Have an end wall opening 77. The end wall opening 77 is a connection conductor (not shown) for connecting the linear conductors 26 of each phase constituting the coil 22 to an inverter (not shown) arranged outside the cover member 25. It is configured to pass. The protruding end wall portion 76 is connected to the end portion 24 of the coil end portion 23 in the axial direction for connection between the end portions of the in-phase linear conductors 26 and connection between the end portions of the linear conductors 26 at the neutral point. It protrudes outward in the axial direction to accommodate the conductor protruding outward in the axial direction.

  In this embodiment, as shown in FIGS. 2 and 8, the inner peripheral wall portion 78 extends from the end surface on the radially inner side of the end wall portion 75 to the inner side in the axial direction (on the stator core 21 side), and It is formed so as to cover a part of the peripheral surface. That is, the inner peripheral wall portion 78 has a gap between the axially inner end surface of the inner peripheral wall portion 78 and the axial end surface 29 of the stator core, and the gap is the inner opening 72. Here, the gaps forming the inner circumferential opening 72 are constant over the entire circumference. The inner opening 72 communicates the accommodation chamber 73 and the radially inner side of the cover member 25 over the entire circumference, and is formed so as to allow the refrigerant supplied from the radially inner side of the cover member 25 to pass therethrough. ing. A method for supplying the refrigerant will be described later. Further, as shown in FIG. 1, the inner peripheral wall portion 78 is formed with a predetermined gap between it and the inner peripheral surface of the coil end portion 23, and this gap serves as a refrigerant flow passage. Here, the inner peripheral surface of the coil end portion 23 is a surface obtained by connecting the innermost peripheral surfaces of the plurality of linear conductors 26 constituting the coil end portion 23 in this example.

  As shown in FIGS. 1, 7, and 8, the cover member 25 extends in the circumferential direction and protrudes inward in the axial direction on a shaft end inner surface 28 that is an inner surface facing the axial end surface 24 of the coil end portion. The convex part 41 which extends in the circumferential direction and the concave part 42 which extends in the axial direction with respect to the convex part 41 and has a shaft end uneven part 45 formed alternately in the radial direction. The shaft end uneven portion 45 is arranged such that the tip of the axial sheet protruding portion 40 is inserted into the recessed portion 41 and the axial sheet protruding portion 40 has a first gap 43 with respect to the shaft end uneven portion 45. Formed to be. Further, the shaft end uneven portion 45 is formed so that the tip of the convex portion 41 is inserted between two axial sheet protruding portions 40 adjacent in the radial direction. And the convex part 41 is formed so that the front-end | tip may have a 2nd clearance gap 44 with respect to the axial direction end surface 24 of the coil end part 23, and it may be arrange | positioned.

  As shown in FIG. 1, the convex portion 41 is formed to protrude inward in the axial direction with respect to other portions (including the concave portion 42) of the shaft end inner surface 28, and the concave portion 42 is formed on the other side of the shaft end inner surface 28. It is formed by retreating outward in the axial direction with respect to the portion (including the convex portion 41). In this embodiment, the bottom surface of the concave portion 42 is used as a reference surface of the shaft end inner surface 28, and the convex portion 41 is formed so as to protrude from the reference surface inward in the axial direction (stator core side). The gap between the two axial sheet protrusions 40 has a radial gap corresponding to the radial width of the linear conductor 26 as described above. Therefore, the radial width of the convex portion 41 is formed to be smaller than the radial width of the linear conductor 26. The gap in the radial direction between the two convex portions 41 adjacent in the radial direction, that is, the width of the concave portion 42 is formed to be larger than the thickness of the interphase insulating sheet 27. Specifically, when the minimum clearance required for the first gap is defined as “first minimum clearance”, the radial width of the convex portion 41 is first from the radial width of the linear conductor 26. It is formed smaller than the width obtained by subtracting twice the minimum gap width. The width in the radial direction of the concave portion 42 is formed to be larger than the width obtained by adding twice the first minimum width to the thickness width of the interphase insulating sheet 27. Further, the bottom of the concave portion 42 is disposed so as to have a gap with respect to the tip of the axial sheet protrusion 40. This gap is larger than the first minimum width. Therefore, the axial sheet protrusion 40 is disposed with a gap larger than the first minimum gap with respect to the shaft end uneven portion 45 around the axial sheet protrusion 40, and such an axial sheet protrusion 40 and the shaft end uneven portion 45 are arranged. Is the first gap 43. The first gap 43 communicates in the radial direction between the spaces partitioned by the axial sheet protrusion 40. In the present example, the first gap 43 communicates in the radial direction the space between the axial sheet protruding portions 40 that are partitioned by the axial sheet protruding portion 40 and formed in four layers in the radial direction. The first gap 43 serves as a refrigerant flow passage through which a refrigerant that cools the coil end portion 23 flows.

  Further, in the present embodiment, the convex portion 41 is formed such that the tip thereof has a gap with respect to the axial end surface 24 of the coil end portion 23 in a state where the cover member 25 is attached to the coil end portion 23. ing. Specifically, when the minimum gap width required for the second gap is the “second minimum gap width”, the gap between the convex portion 41 and the axial end face 24 of the coil end portion is the second minimum gap width. The protruding height of the convex portion 41 is set so as to be the above. The first minimum interval width and the second minimum interval width are determined from the required flow rate of the refrigerant. Such a required flow rate is experimentally determined according to the use state of the rotating electrical machine and the like. And the convex-shaped part 41 respond | corresponded to the circumferential direction length for at least 4 slots so that it might respond | correspond to the circumferential width in the clearance gap between the two axial sheet | seat protrusion parts 40, as shown in FIG. It is formed to extend in the circumferential direction by the length. Further, as described above, the space between the two axial sheet projecting portions 40 is a circumferential direction corresponding to the axial end surface of the outermost circumferential conductor portion 53 forming the arcuate plate-like conductor portion 46. It extends to. And the convex part 41 of the axial end uneven | corrugated | grooved part 45 is formed in the shape corresponding to the shape of the axial direction end surface of the circumferential direction conductor part 53 outermost axially seeing from an axial direction. Specifically, the shape of the end surface in the axial direction of the circumferential conductor 53 is transferred to the inner surface 28 of the shaft end. Therefore, a space including the second gap 44 that is continuously surrounded in the circumferential direction by being surrounded by the two axial sheet protruding portions 40, the axial end surface 24 of the coil end portion, and the convex portion 41 is formed on the four sides. Is done. The space including the second gap 44 is also a refrigerant flow path through which the refrigerant that cools the coil end portion 23 flows.

  Further, as shown in FIGS. 6 and 7, four convex portions 41 are arranged in the radial direction corresponding to the gap between the two axial sheet projecting portions 40, and the projecting end wall portions 76 and the diameters are arranged. It is formed over the entire circumference except for some gaps that are discontinuous in the direction. Accordingly, a space including a plurality of radial gaps 44 arranged in the radial direction and continuously extending in the circumferential direction is formed so as to cover the axial end surface 24 of the coil end portion in the radial direction and the circumferential direction.

  As shown in FIGS. 6 to 8, the cover member 25 is a concave portion that extends in the axial direction and retracts in the radial direction on the cover inner peripheral surface 62 that is the inner peripheral surface facing the outer peripheral surface of the coil end portion 23. It is formed to have a certain concave portion 63 on the inner peripheral surface. And the inner peripheral surface recessed part 63 is formed in the position of the circumferential direction corresponding to the radial sheet protrusion part 61 so that the front-end | tip of the radial sheet protrusion part 61 may be inserted. In the present embodiment, as shown in FIG. 6, the cover inner circumferential surface 62 is formed at a plurality of positions in the circumferential direction over the entire circumference except for the protruding end wall portion 76. In this example, there is a place where two radial sheet protrusions 61 are arranged adjacent to each other in the circumferential direction. Therefore, the inner circumferential surface concave portion 63 is arranged in the circumferential direction of the two radial sheet projections 61 so that both ends of the two adjacent radial sheet projections 61 are inserted into one concave portion. And having a predetermined circumferential width wider than the arrangement interval.

  Moreover, the axial length of the inner peripheral surface concave portion 63 is formed longer than the axial length of the radial sheet projection 61 so that the tip of the radial sheet projection 61 can be inserted. In the present embodiment, as shown in FIG. 8, the axially outer end portion of the inner peripheral surface concave portion 63 is formed at substantially the same axial position (close position) as the axial end inner surface 28. This is because the radial sheet projection 63 is formed by bending the circumferential end of the outer peripheral side interphase insulating sheet 60 as described above, and the axially outer end surface of the radial sheet projection 61 is a shaft. Similarly to the direction sheet projecting portion 40, this corresponds to the fact that the first clearance 43 is disposed between the shaft end inner surface 28. The axially inner end of the inner peripheral surface concave portion 63 is formed so as to coincide with the axially inner end surface of the cover member. Thus, the cover member 25 can be easily attached to the stator 20 from the outside in the axial direction.

  The cover member 25 has a coolant supply portion 71 for supplying coolant to the shaft end inner surface 28. Here, the shaft end inner surface 28 is arranged in a direction intersecting the horizontal plane, and the refrigerant supply unit 71 is formed having a refrigerant supply opening 71 provided at the uppermost part of the shaft end inner surface 28. . In the present embodiment, the shaft end inner surface 28 is arranged in a direction orthogonal to the horizontal plane. The refrigerant supply unit 71 is provided on the outer peripheral edge vertically above which is the uppermost part of the shaft end inner surface 28. The refrigerant supply unit 71 includes a refrigerant supply opening 71 that communicates the tank-shaped unit 81 and the shaft end inner surface 28 described above. As shown in FIGS. 1, 6, and 7, the coolant supply opening 71 is provided at the uppermost portion of the shaft end inner surface 28, so that the shaft end unevenness portion 45 and the axial sheet protrusion portion 40 are located at the outermost portion. It is arranged above the upper part.

2. Refrigerant flow passage The refrigerant for cooling the coil end portion is stored in the storage chamber 73 from the refrigerant supply opening 71 formed on the shaft end inner surface 28 or the inner opening 72 formed radially inside the cover member 25. Supplied in. In the present embodiment, in one refrigerant supply path, the refrigerant is supplied from a refrigerant supply port (not shown) that supplies the refrigerant to the tank-shaped portion 81, and passes through the tank-shaped portion 81 due to gravity to open the refrigerant supply opening. 71. Then, the supplied refrigerant flows through the storage chamber 73 by receiving forces such as gravity and surface tension from the refrigerant supply opening 71 through the shaft end inner surface 28 (disposed at the upper right in FIG. 1). A thick arrow indicates such a refrigerant flow). In another refrigerant supply path, for example, the refrigerant supplied to the rotor (not shown) arranged on the radially inner side of the stator core 21 is blown radially outward by the centrifugal force generated by the rotation of the rotor. The cover member 25 is supplied to the inner opening 72 from the radially inner side to the entire circumference. The refrigerant that has passed through the inner opening 72 passes through the third gap 70 formed over the entire circumference along the axial end surface 29 of the stator core 21 and is supplied to the cover inner peripheral surface 62 (FIG. 1). The thick line arrows arranged on the leftmost side of FIG. 2 indicate such a refrigerant flow). The refrigerant supplied to the cover inner peripheral surface 62 is circulated in the storage chamber 73 by receiving a force such as gravity or surface tension. The linear conductor 26 constituting the coil end portion 23 is cooled by heat exchange with the refrigerant performed in the refrigerant flow process. The refrigerant flowing through the storage chamber 73 is discharged out of the storage chamber 73 through an outer peripheral wall opening 79 formed below the outer peripheral wall portion 74 of the cover member.

  As described above, the first cooling flow passage is formed between the axial end surface 24 of the coil end portion and the axial end inner surface 28 of the cover member by the axial end uneven portion 45, the axial sheet protruding portion 40, and the like. A gap 43 and a second gap 44 are formed. And a refrigerant | coolant can be supplied to the axial direction end surface 24 of a coil end part through this refrigerant | coolant flow path over a wide range.

  Specifically, in FIG. 1, the refrigerant is supplied to the shaft end inner surface 28 from the refrigerant supply opening 71 formed above the shaft end inner surface 28, as indicated by a thick line arrow with a part of the refrigerant flow. The refrigerant flows radially inward along the shaft end inner surface 28 by gravity, and enters the first gap 43 and the second gap 44 as the refrigerant flow passage formed by the shaft end uneven portion 45 and the axial sheet protrusion 40. Supplied. The first gap 43 and the second gap 44 formed by the shaft end uneven portion 45 and the axial sheet protrusion 40 are set in the size (channel cross-sectional area) to flow radially inward along the shaft end inner surface 28. The flow rate of refrigerant and the amount of refrigerant are adjusted. And the flow of the refrigerant in the radial direction is also allocated in the circumferential direction by the refrigerant flow passage formed by the first gap 43 and the second gap 44 extending continuously in the circumferential direction, and the refrigerant is axially end face of the coil end portion. 24 can be distributed in the circumferential direction. In addition, by adjusting the size (flow channel cross-sectional area) of the first gap 43 and the second gap 44, the ratio between the amount of refrigerant flowing in the radial direction and the amount of refrigerant flowing in the circumferential direction is appropriately adjusted. be able to.

  In the present embodiment, the first minimum interval of the first gap 43 is set smaller than the second minimum interval of the second gap 44. By this setting, the first gap 43 mainly adjusts the flow rate in the radial direction and allocates the flow rates in the radial direction and the circumferential direction. The second gap 44 circulates the refrigerant in the circumferential direction and supplies the refrigerant to the axial end surface 24 of the coil end 23 for cooling.

  Further, the grooves on the outer side in the axial direction of the circumferential conductor portion 53 on the radially outer peripheral side and the radially inner peripheral side are also refrigerant flow passages as described above, and along the shaft end inner surface 28 by the first gap 43. A refrigerant whose radial flow is restricted is circulated in the circumferential direction.

  In the present embodiment, as shown in FIG. 1, the second gap 44 as the refrigerant flow passage is formed so as to extend continuously in the circumferential direction, and corresponds to the axial end face 24 of the coil end portion of each phase. Thus, four layers are formed in the radial direction so as to overlap when viewed from the radial direction. Further, the first gap 43 as the refrigerant flow passage is formed so as to continuously extend in the circumferential direction, and is formed so as to communicate between the respective layers of the second gap 44. The refrigerant supplied from the uppermost portion of the shaft end inner surface 28 flows through the first gaps 43 in order from the vertical upper side to the lower side between the second gaps 44, while the first gaps 43 and the second gaps 44. Along the circumferential direction. Therefore, the refrigerant supplied to the first gap 43 and the second gap 44 can spread over the axial end surface 24 of the coil end portion 23 in a wide range in the radial direction and the circumferential direction. Then, the refrigerant flowing through the second gap 44 is in contact with the linear conductor 26 that constitutes the axial end surface 24 of the coil end portion 23, and is further in contact with the other linear conductor 26 of the coil end portion 23, thereby causing the coil end portion 23. Is cooled. Note that, at the lowermost portion of the shaft end inner surface 28, the refrigerant flows from the radially inner side to the outer side along the shaft end inner surface 28, unlike the refrigerant flow direction at the uppermost portion shown in FIG.

  In the present example, the radial width of the second gap 44 is set to the cross-sectional width of the single linear conductor 26, and the single linear conductor forming the axial end face 24 of the coil end portion 23. Since the second gap 44 is formed every 26, the refrigerant can be finely supplied to each one of the linear conductors 26.

  Further, by providing the convex portion 41, the radial refrigerant flow along the shaft end inner surface 28 is directed inward in the axial direction, that is, toward the axial end surface 24 side of the coil end portion 23. Therefore, by providing the convex portion 41, the distance between the shaft end inner surface 28 and the axial end surface 24 of the coil end portion in the convex portion 41 can be reduced, and the refrigerant flowing along the shaft end inner surface 28 can flow. The amount of the refrigerant in contact with the axial end surface 24 of the coil end portion can be increased. Therefore, compared with the case where only the axial sheet protruding portion 40 is provided without providing the convex portion 41, more refrigerant flowing through the axial end inner surface 28 can be supplied to the axial end surface 24 of the coil end portion 23, and the coil end portion The cooling efficiency of 23 can be increased.

  In addition, the first gap 43 and the second gap 44 are continuous in the circumferential direction in the shape facing the axial end surface 24 of the circumferential conductor portion 53 extending continuously in the circumferential direction as described above and axially outward. Are formed by the protruding convex portion 41 and the axial sheet protruding portion 40 of the interphase insulating sheet 27, and are formed so as to extend continuously in the circumferential direction. The first gap 43 and the second gap 44 as refrigerant flow passages extending continuously in the circumferential direction have a length corresponding to the circumferential length of four slots corresponding to the arrangement of the circumferential conductor portion 53. The refrigerant flow passage formed continuously in the circumferential direction and having a predetermined circumferential length is repeatedly arranged over substantially the entire circumference. Therefore, the refrigerant flow passage by the first gap and the second gap can be appropriately formed continuously in the circumferential direction of the coil end portion 23, and the refrigerant is surrounded by the axial end surface 24 of the coil end portion 23. Can be spread over a wide range of directions.

  In addition, the refrigerant that has passed through the third gap 70 from the inner opening 72 and is supplied over the cover inner peripheral surface 62 flows on the cover inner peripheral surface 62 downward in the circumferential direction. In FIGS. 10 and 11, the refrigerant flowing in the circumferential direction along the inner peripheral surface 62 of the cover is blocked by the radial sheet projecting portion 61, as indicated by the thick arrows. The dammed refrigerant flows radially inward along the radial sheet protrusion 61 and is supplied to the outer peripheral surface side of the coil end portion 23. Alternatively, the dammed refrigerant flows axially outward along the radial sheet protrusion 61 and is supplied to the shaft end inner surface 28. The coolant supplied to the shaft end inner surface 28 passes through the first gap 43 and the second gap 44 formed by the shaft end uneven portion 45 and the axial sheet protrusion 40 described above, and the axial end surface 24 of the coil end portion 23. Is supplied extensively.

  In addition, since the tip of the radial sheet protrusion 61 is inserted into the inner peripheral surface concave portion 63 of the cover inner peripheral surface, the radial sheet protrusion 61 hits against the flow of the refrigerant in the circumferential direction, and the circumferential direction The ratio at which the refrigerant flowing through can be blocked is increased.

  Moreover, in this embodiment, the radial sheet | seat protrusion part 61 and the internal peripheral surface recessed part 63 are formed over the substantially whole periphery in the several position of the circumferential direction of the cover internal peripheral surface 62, as shown in FIG. Has been. Therefore, it is easy to supply the refrigerant to various portions of the coil end portion 23 using the refrigerant supplied from the refrigerant supply opening 71 and the inner opening 72 and flowing along the cover inner peripheral surface 62.

[Other Embodiments]
(1) In said embodiment, the end wall part 75 has the protrusion end wall part 76 and the end wall opening part 77, The axial end uneven | corrugated | grooved part 45, the radial direction sheet | seat protrusion part 61, And the case where the inner peripheral surface recessed part 63 is not formed was demonstrated as an example. However, the embodiment of the present invention is not limited to this. That is, a connection conductor for connecting to the inverter is disposed other than the end wall portion 75 such as the outer peripheral wall portion 74, and the end wall portion 75 has the protruding end wall portion 76 and the end wall opening portion 77. It is also preferable to use a circular plate shape that covers the entire axial end surface of the coil end portion 23. In this case, it is preferable that the shaft end uneven portion 45, the axial sheet protruding portion 40, the radial sheet protruding portion 61, and the inner peripheral surface recessed portion 63 are formed over the entire circumference of the shaft end inner surface 28. is there.
Alternatively, any or all of the shaft end uneven portion 45, the axial sheet protrusion 40, the radial sheet protrusion 61, the inner peripheral surface concave portion 63, and the third gap 70 for a part of the region inside the shaft end inner surface 28. It is also one of the preferred embodiments of the present invention not to form.
By doing in this way, the refrigerant | coolant by the 1st clearance gap 43, the 2nd clearance gap 44, and the 3rd clearance gap 70 according to the bias | inclination of the distribution | circulation of the refrigerant | coolant in the storage chamber 73, or the location which wants to cool the coil end part 23 etc. Arrangement of the flow passage and the refrigerant flow passage by the radial sheet protrusion 61 is made appropriate, and the refrigerant can be circulated more effectively.

(2) In the above embodiment, as an example, the circumferential width of the axial sheet protrusion 40 and the convex portion 41 is formed to a length corresponding to the circumferential length of four slots. Although described, the embodiment of the present invention is not limited to this. That is, the circumferential length of the axial sheet protrusion 40 and the convex portion 41 is a length corresponding to the circumferential length of 8 slots, a length over the entire circumference, or an arbitrary length. Is also suitable. It is also an embodiment of the present invention that the gaps between the two axial sheet protrusions 40 and the two convex portions 41 adjacent to each other in the circumferential direction are arranged to be small or arranged to overlap each other. One.

(3) In the above-described embodiment, a plurality of axial sheet protrusions 40 or interphase insulating sheets 27 are arranged in the radial direction so as to overlap when viewed from the radial direction, and are adjacent to each other in the circumferential direction. The case where the gaps between the sheet protrusions 40 or the interphase insulating sheets 27 are arranged in an overlapping positional relationship when viewed from the radial direction has been described as an example, but the embodiment of the present invention is not limited to this. That is, for example, the axial sheet protrusion 40 or the interphase insulating sheet 27 is arranged so that the gap between the two axial sheet protrusions 40 or the interphase insulating sheets 27 adjacent in the circumferential direction is not arranged in an overlapping position as viewed from the radial direction. Alternatively, it is one of the preferred embodiments of the present invention that a plurality of the shaft end uneven portions 45 are arranged in the radial direction while being shifted in the circumferential direction.

(4) In the above embodiment, the case where only one interphase insulating sheet 27 is arranged in the axial direction has been described as an example. However, the embodiment of the present invention is not limited to this. That is, it is preferable that a plurality of interphase insulating sheets 27 are arranged in the axial direction, and the axial sheet protrusions are formed on the outer interphase insulating sheet, or the interphase insulating sheets 27 are shifted in the axial direction. It is also one of the preferred embodiments of the present invention that a plurality of sheets are arranged and the axial sheet protrusion is formed on the radially outer interphase insulating sheet.

(5) In the above embodiment, in addition to the radial sheet protrusion 61, the interphase insulating sheet 27 extending in the radial direction and the axial direction is formed and described as an example of a rectangular wave, however, However, the embodiment of the present invention is not limited to this. That is, it is preferable that the interphase insulating sheet 27 extending in the radial direction and the axial direction excluding the radial sheet protruding portion 61 is not provided, and a plurality of interphase insulating sheets 27 are arranged so as to overlap each other when viewed from the radial direction. It is one of the embodiments of the invention.

(6) In the above embodiment, the radial sheet protrusion 61 has been described as an example in which the circumferential end of the outer-phase interphase insulating sheet 60 is bent outward in the radial direction. The embodiment of the present invention is not limited to this. That is, it is also preferable to form the radial sheet projecting portion 61 separately from the outer peripheral interphase insulating sheet 60, or to form a portion other than the circumferential end portion by bending (for example, a convex shape). One of the forms.
Even if it does in this way, the refrigerant | coolant flow path by the radial direction sheet | seat protrusion part 61 can be formed, and there exists an effect which improves the distribution | circulation of the refrigerant | coolant of a coil end part.

(7) In the above embodiment, the convex portion 41 has been described as an example in which the convex portion 41 is not formed on the axially outer side with respect to the circumferential conductor portion 53 on the radially outermost side and the innermost circumferential side. The embodiment of the invention is not limited to this. That is, the convex portion 41 is one of the preferred embodiments of the present invention that may be formed on the axially outer side with respect to the circumferential conductor portion 53 on the radially outermost side and the innermost circumferential side.
In the above embodiment, the case where the interphase insulating sheet 27 and the axial sheet protrusion 40 are not arranged on the radially outer peripheral side and the inner peripheral side of the coil end portion 23 has been described as an example. The form is not limited to this. That is, it is one of the preferred embodiments of the present invention that the interphase sheet 27 and the axial sheet protrusion 40 are arranged on the radially outer peripheral side and inner peripheral side of the coil end portion 23.

(8) In the above embodiment, the case where the shaft end uneven portion 45 is formed by forming the convex portion 41 so as to protrude with respect to the reference surface of the shaft end inner surface 28 has been described as an example. The embodiment of the present invention is not limited to this. That is, it is one of the preferred embodiments of the present invention that the shaft end uneven portion 45 is formed by forming the concave portion 42 so as to retreat with respect to the reference surface of the shaft end inner surface 28.

(9) In the above embodiment, the size of each of the first gap 43, the second gap 44, or the third gap 70 does not basically change depending on the position in the radial direction and the circumferential direction. The case is illustrated as an example. However, the embodiment of the present invention is not limited to this. That is, one preferred embodiment of the present invention is suitable even if the size of each of the first gap 43, the second gap 44, or the third gap 70 is changed depending on the position in the radial direction and the circumferential direction. One.
By doing so, each of the first gap 43, the second gap 44, and the third gap 70, depending on the distribution of the refrigerant in the accommodation chamber 73 or the location where the coil end portion 23 is to be cooled, etc. It is possible to adjust the flow rate, flow rate, and the like of the refrigerant flowing through the refrigerant, and to appropriately distribute the refrigerant.

(10) In the above embodiment, the convex portion 41 has been described as an example in which the convex portion 41 is formed in a shape corresponding to the shape of the end surface in the axial direction of the circumferential conductor portion 53 as viewed from the axial direction. The embodiment of the present invention is not limited to this. That is, the convex portion 41 only needs to have a shape inserted between two axially adjacent sheet protruding portions 40 that are adjacent in the radial direction. For example, the shape of the axial end surface of the circumferential conductor portion 53 is only partly. It is also one of the preferred embodiments of the present invention to form a shape corresponding to the above.

(11) In the above embodiment, the case where the linear conductor 26 forming the coil 22 has a rectangular cross section has been described as an example. However, the embodiment of the present invention is not limited to this. In other words, the linear conductor 26 forming the coil 22 may have a cross-sectional shape other than a rectangular cross-section, such as a circle, an ellipse, a polygon such as a hexagon or an octagon. This is one of the embodiments.

(12) In the above-described embodiment, the case where the linear conductor 26 of the coil end portion 23 and the interphase insulating sheet 27 are arranged so as to be almost in contact with each other has been described as an example. However, the embodiment of the present invention is not limited to this. That is, a configuration in which a gap is provided between the linear conductor 26 of the coil end portion 23 and the interphase insulating sheet 27 is also one preferred embodiment of the present invention.
If it does in this way, a part of refrigerant | coolant which distribute | circulates the 2nd clearance gap 44 can be distribute | circulated in the clearance gap between the linear conductor 26 of the coil end part 23, and the interphase insulation sheet 27, and there exists an effect which improves the distribution | circulation of a refrigerant | coolant.

(13) In the above embodiment, the case where one linear conductor 26 is disposed between two interphase insulating sheets 27 adjacent in the radial direction has been described as an example. However, the embodiment of the present invention Is not limited to this. That is, two interphase insulating sheets 27 adjacent to each other in the radial direction are arranged such that two arcuate plate-like conductor portions 46 of the same phase are arranged adjacent to each other in the radial direction or the conductors are formed in a bundle shape. It is also one of the preferred embodiments of the present invention that two or more conductors 26 are disposed between the two.

(14) In the above embodiment, the case where the circumferential conductor portion 53, the axial sheet protrusion 40, and the shaft end uneven portion 45 are formed in an arc shape curved radially inward along the circumferential direction. However, the embodiment of the present invention is not limited to this, that is, the circumferential conductor portion 53, the axial sheet protrusion 40, and the shaft end uneven portion 45 have shapes other than arcs, For example, even if it is formed in an arbitrary shape such as a linear shape or a polygonal shape, it is one of the preferred embodiments of the present invention.

(15) In the above embodiment, the case where the axial conductor portion 52 and the circumferential conductor portion 53 are formed in the coil end 23 has been described as an example. However, the embodiment of the present invention is limited to this. It is not a thing. That is, the axial conductor portion 52 and the circumferential conductor portion 53 cannot be clearly distinguished from each other, for example, are formed by an arbitrary curve or straight line such as an ellipse, Even if the directional sheet protrusion 40, the shaft end uneven portion 45, the radial sheet protrusion 61, the third gap 70, and the like are formed, it is one of the preferred embodiments of the present invention.

(16) In the above embodiment, the case where the cover member 25 is formed in a double cylindrical shape has been described as an example. However, the embodiment of the present invention is not limited to this. In other words, the configuration without the inner peripheral wall portion 78 may be configured by only the outer peripheral wall portion 74 and the end wall portion 75. In this case, the inner opening 72 is formed by a gap between the radially inner end face of the end wall 75 and the axial end face 29 of the stator core.
Further, the outer peripheral wall portion 74, the end wall portion 75, and the inner peripheral wall portion 78 of the cover member 25 are formed with an arbitrary curve or straight line, for example, an elliptical cross-sectional shape so that the cover member 25 cannot be clearly distinguished. One of the preferred embodiments of the present invention is that the axial sheet protruding portion 40, the shaft end uneven portion 45, the radial sheet protruding portion 61, the inner peripheral surface recessed portion 63 and the like may be formed according to the shape. It is.

(17) In the above embodiment, the case where the interphase insulating sheet 27 is formed in the direction perpendicular to the axial end surface 29 of the stator core 20 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the interphase insulating sheet 27 may be formed so as to be inclined radially inward or outward from the vertical direction of the axial end surface 29 of the stator core 20. In this case, according to the inclination of the interphase insulating sheet 27, the shaft end uneven portion 45, the shaft end inner surface 28, the radial sheet projecting portion 61, and the like may be formed to be inclined. It is.

(18) In the above embodiment, the case where the inner peripheral surface concave portion 63 is formed by forming the concave portion on the cover inner peripheral surface 62 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, even if the inner peripheral surface concave portion 63 is formed by forming two convex portions on the cover inner peripheral surface 62, it is one of the preferred embodiments of the present invention.
In addition, it is also preferable that the inner peripheral surface concave portion 63 is not formed on the cover inner peripheral surface 62 and the distal end of the radial sheet protrusion 61 is brought close to or in contact with the cover inner peripheral surface 62. one of.
Even if it does in this way, a refrigerant | coolant can be distribute | circulated to the refrigerant | coolant flow path of the 1st clearance gap 43 and the 2nd clearance gap 44, and the refrigerant | coolant flow path by the radial direction sheet | seat protrusion part 61, and the distribution | circulation of the refrigerant | coolant of a coil end part is improved. There is an effect.

(19) In the above embodiment, the case where the coolant supply opening 71 is formed at the uppermost portion of the shaft end inner surface 28 has been described as an example. However, the embodiment of the present invention is not limited thereto. It is not something. That is, it is preferable that the coolant supply opening 71 is formed on the shaft end inner surface 28 other than the uppermost portion, and the coolant supply opening 71 is formed at a plurality of locations on the shaft end inner surface. Even if it forms, it is suitable, and it is one of the embodiments of the present invention that is suitable even if it is formed in any part of the inner surface of the cover member 25.
Even if it does in this way, a refrigerant | coolant can be distribute | circulated to the refrigerant | coolant flow path of the 1st clearance gap 43 and the 2nd clearance gap 44, and the refrigerant | coolant flow path by the radial direction sheet | seat protrusion part 61, and the distribution | circulation of the refrigerant | coolant of a coil end part is improved. There is an effect.

(20) In the above embodiment, the case where the refrigerant is circulated in the accommodation chamber 73 by a force such as gravity or surface tension has been described as an example. However, the embodiment of the present invention is limited to this. is not. That is, it is also preferable to supply the refrigerant into the storage chamber 73 of the cover member 25 using a pressure pump or the like. In this case, since the force of gravity is not necessarily required, the refrigerant can be circulated suitably even if the refrigerant supply part such as the opening 71 is formed at a place other than the uppermost part of the shaft end inner surface 28.

(21) In the above embodiment, the case where the shaft end inner surface 28 is arranged in a direction orthogonal to the horizontal plane has been described as an example. However, the embodiment of the present invention is not limited to this. That is, it is one of the preferred embodiments of the present invention that the shaft end inner surface 28 is inclined and arranged so as to be in an intersecting direction other than perpendicular to the horizontal plane.
Even in this case, the refrigerant can be circulated by the force of gravity, and the refrigerant can be circulated by the refrigerant flow path of the first gap 43 and the second gap 44 and the refrigerant flow path of the radial sheet protrusion 61. There is an effect.

  The present invention includes a cylindrical stator core, a coil wound around the stator core, a coil end portion of the coil protruding from an axial end surface of the stator core, and a cover member that covers the coil end portion, The refrigerant for cooling the coil end portion can be suitably used for the stator that circulates in the cover member.

20: Stator 21: Stator core 22: Coil 23: Coil end portion 24: Axial end surface 25 of the coil end portion 25: Cover member 26: Conductor (linear conductor)
27: Interphase insulating sheet 28: Shaft end inner surface 29: Stator core axial end surface 40: Axial sheet protrusion 41: Convex portion 42: Concave portion 43: First gap 44: Second gap 45: Shaft end uneven portion 46 : Arc plate-like conductor portion 50: Slot 51: Slot conductor portion 52: Axial conductor portion 53: Circumferential conductor portion 60: Outer phase interphase insulating sheet 61: Radial sheet protrusion 62: Cover inner circumferential surface 63: Inner circumference Surface concave part 70: Third gap 71: Opening part for supplying refrigerant (refrigerant supply part)
72: Inner opening 73: Storage chamber 81: Tank-like part 82: Mounting wall part 74: Outer wall part 75: End wall part 76: Protruding end wall part 77: End wall opening part 78: Inner peripheral wall part 79: Outer peripheral wall Aperture

Claims (7)

A stator comprising a cylindrical stator core, a coil wound around the stator core, a coil end portion of the coil protruding from an axial end surface of the stator core, and a cover member covering the coil end portion,
An interphase insulating sheet inserted between conductors of different phases constituting the coil end portion is disposed so as to extend in the circumferential direction and the axial direction, and a predetermined amount from the axial end surface of the coil end portion in the axial direction. A plurality of protruding axial sheet protrusions are arranged in the radial direction in a positional relationship overlapping when viewed from the radial direction,
The cover member extends in the circumferential direction and protrudes in the axial direction on the shaft end inner surface, which is the inner surface facing the axial end surface of the coil end portion, and extends in the circumferential direction with respect to the convex portion. The concave and convex portions that retreat in the axial direction have the concavo-convex portions formed alternately in the radial direction,
The tip of the axial sheet protrusion is inserted into the concave part, and the axial sheet protrusion is disposed with a first gap with respect to the shaft end uneven part,
The tip of the convex portion is inserted between two axial sheet protrusions that are adjacent in the radial direction, and the tip of the convex portion has a second gap with respect to the axial end surface of the coil end portion. Arranged,
The stator in which the first gap and the second gap serve as a refrigerant flow passage through which a refrigerant that cools the coil end portion flows. The stator core has a plurality of slots provided along a circumferential direction, and the coil end portion is different from an axial conductor portion extending in the axial direction from a slot conductor portion inserted in each slot, and between different slots. A circumferential conductor portion that connects the two axial conductor portions by connecting them in the circumferential direction,
The stator according to claim 1, wherein the convex portion of the shaft end uneven portion has a shape corresponding to a shape of an end surface in the axial direction of the circumferential conductor portion when viewed from the axial direction. A radial sheet projecting portion in which a plurality of radially arranged outer peripheral phase interphase insulating sheets, which are arranged on the outermost peripheral side, project a predetermined amount radially outward from the outer peripheral surface of the coil end portion. Have
The cover member has an inner peripheral surface concave portion that is a concave portion extending in the axial direction and retracted in the radial direction on the inner peripheral surface of the cover that is an inner peripheral surface facing the outer peripheral surface of the coil end portion,
The stator according to claim 1 or 2, wherein a tip end of the radial sheet protrusion is inserted into the concave portion on the inner peripheral surface. The interphase insulating sheet is disposed such that a tip on the stator core side has a third gap with respect to an axial end surface of the stator core,
The stator according to any one of claims 1 to 3, wherein the third gap is a refrigerant flow path through which a refrigerant that cools the coil end portion flows.   The stator according to any one of claims 1 to 4, wherein the cover member includes a refrigerant supply unit configured to supply a refrigerant to the inner surface of the shaft end. The shaft end inner surface is arranged in a direction intersecting a horizontal plane,
The stator according to claim 5, wherein the refrigerant supply unit has a refrigerant supply opening provided at an uppermost portion of the inner surface of the shaft end. The cover member has an inner opening on a radially inner side,
The stator according to any one of claims 1 to 6, wherein the inner opening is formed to pass a refrigerant supplied from a radially inner side of the cover member.

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