JP2013034330A - Stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling efficiency by allowing a cooling medium to flow from a gap between insulating insulators.SOLUTION: A stator includes: a stator core 20 radially provided with a plurality of slots TS1-TS48; a plurality of segment coils 15 which are provided in the slots TS1-TS48 in the radial direction of the stator core 20 and each of which is formed in a U-shape by a pair of linear parts 15d and a connecting part 15c; and individual insulating insulators 5. The individual insulating insulators 5 are individually inserted to ends M of the linear parts 15d, thereby allowing a cooling medium to flow in the radial direction of the stator.

Description

  The present invention relates to a stator core having a plurality of slots in a radial shape, a pair of straight portions provided in the slot in the radial direction of the stator core, a segment coil configured in a U shape by a connecting portion, and end portions of the straight portions The present invention relates to a stator having an insulating insulator between them.

Conventionally, as this type of technology, there is a stator shown in FIGS. The stator shown in FIGS. 17 to 19 is originally a circumferential shape, but is a conceptual diagram expressed by arranging the segment coils on a plane so that the relationship with the segment coils can be easily understood.
As shown in FIG. 17, a plurality of segment coils 101 arranged in a row in the radial direction are inserted into the stator 100. The segment coil 101 has a straight portion 101a and a connecting portion 101b, and a segment end 101c is formed on the straight portion 101a. As shown in FIG. 18, the insulating insulator 102 is inserted between the segment end portions 101 c of the plurality of segment coils 101. As shown in FIG. 19, after inserting the insulating insulator 102, the segment end portion 101c of the segment coil 101 is gripped and twisted, and the segment end portions 101c are joined and arranged in an annular shape to form the stator 100.

  In the stator 100 shown in FIG. 19, since the insulating insulator 102 is inserted, a gap is formed between the segment end portions 101 c and does not come into contact. Therefore, good insulation can be ensured.

  Similarly, Patent Literature 1 and Patent Literature 2 also include a stator in which an insulating insulator is inserted.

Japanese Patent No. 4186882 JP 2005-124388 A

However, the prior art has the following problems.
That is, this stator core is used for a hybrid motor, but when the hybrid motor is used and the stator core is energized, the coil generates heat and has a large heat. In particular, since a hybrid motor requires high output, it tends to be hot. When the motor becomes hot, the electric resistance increases and the output efficiency of the motor decreases, or the varnish and insulating insulator applied to the segment coils are accelerated to deteriorate the insulation resistance, causing a failure.
Therefore, in the state shown in FIG. 20, it is necessary to apply a cooling medium directly to the stator 200 to reduce the heat of the segment coils of the stator core 100.

  However, as shown in FIG. 21, which is a partially enlarged view of the dotted line Y in FIG. 20, the insulating insulator 102 has a cylindrical shape and is arranged on the stator core 100 in the circumferential direction. When the cooling medium is flowed as shown in FIG. 21, the cooling medium hits the insulating insulator 102A at the outermost periphery of the four layer portions and flows in the circumferential direction as it is. Therefore, it is possible to cool the segment coil 101A, which is a four-layer segment coil, by directly flowing a cooling medium. On the other hand, the segment coils 101B to 101D, etc., which are the internal segment coils from the first layer to the third layer, are isolated by the insulating insulators 102A to 102C and the like, so that it is difficult for the cooling medium to flow and cool directly. Therefore, it becomes a problem because the cooling effect of the internal segment coils 101B to 101D from the first layer to the third layer is lowered.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stator in which a cooling medium is allowed to flow from a gap of an insulating insulator and cooling efficiency is improved.

In order to achieve the above object, a stator according to an aspect of the present invention has the following configuration.
(1) A stator core having a plurality of slots radially, a pair of straight portions provided in the slot in the radial direction of the stator core, and a segment coil configured in a U shape by a connecting portion; In a stator having an insulating insulator between end portions, individual insulating insulators are individually inserted into the end portions.
Here, the end portion refers to a portion protruding from the stator core in the straight portion of the segment coil.

(2) In the stator described in (1), the individual insulating insulator is formed with two cut holes for inserting the segment coils, and the two cut holes are in parallel positions. It is preferable to be located at.

(3) In the stator described in (2), it is preferable that a tear prevention hole is formed at both ends of the cut hole.

(4) In any one of the stators described in (1) to (3), it is preferable that a fluid hole for allowing a fluid to flow into the individual insulating insulator is formed.

(5) In any one of the stators described in (1) to (4), it is preferable that a corner portion of the individual insulating insulator is chamfered.

The operation and effect of the stator will be described.
(1) Since the individual insulating insulators are individually inserted into the end portions of the straight portions of the segment coils, the cooling medium can be flowed from the gaps between the individual insulating insulators. Therefore, a cooling medium can be poured with respect to the radial direction of the stator. The cooling efficiency of the entire stator can be improved by allowing the cooling medium to penetrate into the center portion of the stator that is in the radial direction.
In addition, by inserting the individual insulation insulators individually into the end portions of the straight portions of the segment coils, the individual insulation insulators can be positioned directly with respect to the portions that require insulation, and insulation can be ensured. Furthermore, by using the individual insulation insulator, a gap is formed between the individual insulation insulators, and the cooling medium can flow.
Further, by using an individual insulation insulator, it is only necessary to prepare a portion that requires insulation, so that an extra insulation insulator can be eliminated. Therefore, material costs can be reduced.
Moreover, since the individual insulation insulator is inserted for every segment coil, the position shift of an insulation insulator can be prevented and segment coils can be insulated reliably.

(2) In addition to the effects described in (1), the individual insulation insulator has two cut holes for inserting the segment coils, and the two cut holes are in parallel positions. By being positioned, the individual insulating insulator can be easily inserted and fixed to the end of the segment coil.
Further, by inserting the end of the segment coil into one notch hole and further inserting the end of the segment coil into the other notch hole, the individual insulating insulator can be fixed to the segment coil. In particular, since the segment coil has a rectangular cross section, the individual insulating insulator is fixed without rotating by inserting the end portions of the segment coil into two cut holes. Since the individual insulation insulator is fixed, the distance between the segment coils can be ensured, so that the insulation can be ensured.

(3) In addition to the effects described in (2), since the tear prevention holes are formed at both ends of the cut hole, the cut hole can be prevented from being broken. The cut hole has a repulsive force to return to the original position with respect to the segment coil. The individual insulating insulator is fixed to the segment coil by the repulsive force. Therefore, when the cut hole is broken, the repulsive force due to the cut hole is lost and the fixing force cannot be exhibited. Therefore, since the cut hole can be prevented from being broken, the individual insulating insulator can be fixed to the segment coil without change.

(4) In addition to the functions and effects described in (1) to (3), the cooling medium can flow through the insulating insulator by forming a fluid hole for allowing a fluid to flow into the individual insulating insulator. Since the cooling medium can flow through the individual insulating insulator, the cooling medium can flow in the radial direction of the stator. Therefore, the cooling medium can reach the center of the stator, so that the cooling efficiency of the entire stator can be improved.

(5) In addition to the functions and effects described in (1) to (4), the corners of the individual insulation insulator are chamfered, so that the individual insulation insulator matches the shape of the twisted curved surface when the segment coil is twisted. . Thereby, since the area which an individual insulation insulator protrudes from a segment coil becomes small, an individual insulation insulator does not interfere with other segment coils and other individual insulation insulators.
In addition, since only the portion where the individual insulation insulator is necessary, the material cost can be reduced.

It is a conceptual diagram of the manufacturing process (1) of the stator which concerns on this invention. It is a conceptual diagram of the manufacturing process (2) of the stator which concerns on this invention. It is a conceptual diagram of the manufacturing process (3) of the stator which concerns on this invention. It is a conceptual diagram of the stator which concerns on this invention. FIG. 5 is a partially enlarged conceptual diagram relating to a dotted line X of the stator shown in FIG. 4 according to the present invention. It is a front view of the separate insulation insulator concerning the present invention. It is a front view in the state where the individual insulation insulator was inserted in the end of the segment coil concerning the present invention. FIG. 4 is a partially enlarged conceptual view of the stator shown in FIG. 3 according to the present invention. It is the figure which showed the modification of the insertion hole of the separate insulation insulator which concerns on this invention. It is a front view of the modification (1) of the separate insulation insulator which concerns on this invention. It is a front view of the modification (2) of the separate insulation insulator which concerns on this invention. It is a front view of modification (3) of the individual insulation insulator concerning the present invention. It is a conceptual diagram of the segment coil which concerns on this invention. It is a partial conceptual sectional view of a stator core in which ten in-slot conductors S1 to S10 are arranged in each slot according to the present invention. It is a figure which shows arrangement | positioning and connection of the segment coil of the U-phase 1st coil U1 which concern on this invention. It is a figure which shows arrangement | positioning and connection of the segment coil of the U-phase 2nd coil U2 which concerns on this invention. It is a conceptual diagram of the manufacturing process (1) of the stator which concerns on a prior art. It is a conceptual diagram of the manufacturing process (2) of the stator which concerns on a prior art. It is a conceptual diagram of the manufacturing process (3) of the stator which concerns on a prior art. It is a conceptual diagram of the stator which concerns on a prior art. It is a partially expanded conceptual diagram concerning the dotted line Y of the stator shown in FIG. 20 according to the prior art. It is an external appearance perspective view which shows the whole stator which concerns on this invention.

  Next, an embodiment of a stator according to the present invention will be described with reference to the drawings.

(First embodiment)
<Configuration of motor>
The motor of the present invention is formed by a stator 1, a stator, a housing, and the like. The motor in the present embodiment is not different from the prior art except for the structure of the stator 1 which will be described in detail below, and the description thereof will be omitted. In addition, the motor of this invention has the same effect as the effect which the motor of a prior art has.

<Structure of stator>
FIG. 4 shows a conceptual cross-sectional view of the stator 1. FIG. 14 shows a partial conceptual cross-sectional view of a stator core in which ten in-slot conductors S1 to S10 are arranged in each slot of the stator 1. FIG.
As shown in FIG. 4, the stator 1 includes a stator core 20 and the like. The stator core 20 according to the present embodiment includes 48 teeth T1 to T48 and 48 slots TS1 to TS48. Further, as shown in FIG. 14, ten in-slot conductors S1 to S10 are mounted in the slots TS1 to TS48. In the text, the term “in-slot conducting wire” refers to an in-slot conducting wire having a segment coil inserted into the stator core. Therefore, the segment coil and the in-slot lead are the same item.

As shown in FIG. 14, in the slot TS22 between the teeth T21 and T22, the in-slot conductors U1A1S1 to U10A1S1 which constitute ten straight portions A1 on one side of the first segment group A of the U-phase first coil U1. U1A1S10 is disposed so as to overlap from the outer peripheral side to the inner peripheral side. In the slot TS23 between the teeth T22 and the teeth T23, the in-slot conductors U2A1S1 to U2A1S10 constituting the ten straight portions A1 on one side of the first segment group A of the U-phase second coil U2 are connected from the outer peripheral side to the inner side. It is arranged on the circumferential side.
In the slot TS24 between the teeth T23 and the teeth T24, the in-slot conducting wires V1A1S1 to V1A1S10 constituting the ten linear portions A1 on one side of the first segment coil group A of the V-phase first coil V1 are provided from the outer peripheral side. It is arranged on the inner circumference side. In the slot TS25 between the teeth T24 and the teeth T25, the in-slot conductors V2A1S1 to V2A1S10 constituting the ten straight portions A1 on one side of the first segment coil group A of the V-phase second coil V2 are provided from the outer peripheral side. It is arranged on the inner circumference side.

In the slot TS26 between the teeth T25 and the teeth T26, the in-slot conductors W1A1S1 to W1A1S10 constituting the ten straight portions A1 on one side of the first segment coil group A of the W-phase first coil W1 are provided from the outer peripheral side. It is arranged on the inner circumference side. In the slot TS27 between the teeth T26 and T27, the in-slot conductors W2A1S1 to W2A1S10 constituting the ten straight portions A1 on one side of the first segment coil group A of the W-phase second coil W2 are provided from the outer peripheral side. It is arranged on the circumferential side.
The slot TS28 between the teeth T27 and the teeth T28 is configured so that the in-slot conductors U1A2S1 to U1A2S10 constituting the other ten linear portions A2 of the first segment coil group A of the U-phase first coil U1 It is arranged on the side. Each of the ten segment coils 9 includes a U-phase first coil U1, a U-phase second coil U2, a V-phase first coil V1, a V-phase second coil V2, a W-phase first coil W1, and a W-phase second coil. W2 is configured.

The six coils of the U-phase first coil U1, the U-phase second coil U2, the V-phase first coil V1, the V-phase second coil V2, the W-phase first coil W1, and the W-phase second coil W2 are , Each consisting of four segment coil groups A, B, C and D.
The arrangement of the segment coils of the U-phase first coil U1 is shown in FIG. 15, and the arrangement of the segment coils of the U-phase second coil U2 is shown in FIG. The arrangement of the V-phase first coil V1, the V-phase second coil V2, the W-phase first coil W1, and the W-phase second coil W2 is also in accordance with FIGS.
As shown in FIG. 15, segment coils U1A, U1B, U1C, and U1D are provided as slots U22A, U1A1, TS28 (U1A2), TS34 (U1B1), TS40 (as U-phase first coil U1) in 48 slots. U1B2), TS46 (U1C1), TS4 (U1C2), TS10 (U1D1), and TS16 (U1D2).
As shown in FIG. 16, segment coil groups U2A, U2B, U2C, and U2D are provided as slots U23A, U2B, U2C, and U2D in slots TS23 (U2A1), TS29 (U2A2), TS35 (U2B1), TS41 (U2B2), and TS47. (U2C1), TS5 (U2C2), TS11 (U2D1), and TS17 (U2D2) are inserted at eight locations.

Similarly, segment coil groups V1A, V1B, V1C, and V1D as the V-phase first coil V1 include slots TS24 (V1A1), TS30 (V1A2), TS36 (V1B1), TS42 (V1B2), TS48 (V1C1), and TS6. (V1C2), TS12 (V1D1), and TS18 (V1D2) are inserted at eight locations.
As the V-phase second coil, segment coil groups V2A, V2B, V2C, and V2D include slots TS25 (V2A1), TS31 (V2A2), TS37 (V2B1), TS43 (V2B2), TS1 (V2C1), and TS7 (V2C2). ), TS13 (V2D1), and TS19 (V2D2).

Similarly, the segment coil groups W1A, W1B, W1C, and W1D as the W-phase first coil W1 include slots 26 (W1A1), TS32 (W1A2), TS38 (W1B1), TS44 (W1B2), TS2 (W1C1), and TS8. (W1C2), TS14 (W1D1), and TS20 (W1D2) are inserted at eight locations.
As the W-phase second coil, segment coil groups W2A, W2B, W2C, and W2D include slots TS27 (W2A1), TS33 (W2A2), TS39 (W2B1), TS45 (W2B2), TS3 (W2C1), and TS9 (W2C2). ), TS15 (W2D1), and TS21 (W2D2).
Since six coils are provided with a total of 20 linear portions, a pair of 10 coils, a total of 480 linear portions is four times that, and 10 coils are arranged for 48 slots TS1 to TS48. .

Here, in order to form the U-phase distributed winding coil, the U-phase first coil U1 is connected to each other inside the segment coil groups U1A, U1B, U1C, U1D of the U-phase first coil. The four segment coil groups U1A, U1B, U1C, and U1D need to be sequentially connected. Similarly, it is necessary to connect the segment groups U2A, U2B, U2C, U2D of the U-phase second coil sequentially.
Furthermore, it is necessary to connect the U-phase first coil U1D and the U-phase second coil U2A. Similarly, in order to form a V-phase distributed winding coil, it is necessary to connect the V-phase first coil V1D and the V-phase second coil V2A in the same manner as the U-phase. Similarly, in order to form a W-phase distributed winding coil, it is necessary to connect the W-phase first coil W1D and the W-phase second coil W2A in the same manner as the U-phase.

The internal connection will be described with reference to FIG. 8 showing a partially enlarged conceptual side view of the stator 1.
As shown in FIG. 8, the end portion U1A1S1M of the in-slot conductor U1A1S1 of the straight portion U1A1 on one side of the U-phase first coil and the end portion U1A2S2M of the in-slot lead U1A2S2 of the other straight portion U1A2 It is necessary to connect “M” at the end to indicate the end of the conducting wire). For this purpose, the end U1A1S1M of the in-slot lead U1A1S1 protruding from the stator core 11 is twisted counterclockwise as shown by the arrow in FIG. 14, and the end U1A2S2M of the in-slot lead U1A2S2 protruding from the stator core 11 is formed. Are formed by twisting them clockwise and welding them together.
Further, the end U2A1S1M protruding from the stator core 11 of the in-slot lead U2A1S1 is twisted counterclockwise as shown by the arrow in FIG. 14, and the end U1A2S2M protruding from the stator core 11 of the in-slot lead U1A2S2 is watched. Twist around and close and weld them together.
The other end portions of the in-slot lead wires are similarly twisted and welded together.

Next, connection of segment coils in the entire stator 1 will be described.
As shown in FIG. 22, the end U1A2S1M of U1A2S1 located on the outermost periphery of the in-slot conductor inserted in the slot TS28 of the U-phase first coil U1 is the end of the in-slot conductor U1B1S1 inserted in the slot TS34. It is connected to the unit U1B1S2M. As shown in FIG. 15, the in-slot conductor U1A2S1 is integral with the in-slot conductor U1A1S1 on the connecting portion 12 side. As shown in FIG. 22, the end U1A1S1M of the in-slot conductor U1A1S1 is connected to the end U1A2S2M of the in-slot conductor U1A2S2. As shown in FIG. 15, the in-slot conductor U1A2S2 is integral with the in-slot conductor U1A1S3 on the connecting portion 12 side.

  The end U1A1S3M of the in-slot conductor U1A1S3 is connected to the end U1A2S4M of the in-slot conductor U1A2S4. The in-slot conductor U1A2S4 is integral with the in-slot conductor U1A1S5 on the connecting portion 15c side. The end U1A1S5M of the in-slot conductor U1A1S5 is connected to the end U1A2S6M of the in-slot conductor U1A2S6. The in-slot conductor U1A2S6 is integral with the in-slot conductor U1A1S7 on the connecting portion 15c side. The end U1A1S7M of the in-slot conductor U1A1S7 is connected to the end U1A2S8M of the in-slot conductor U1A2S8. The in-slot conductor U1A2S8 is integral with the in-slot conductor U1A1S9 on the connecting portion 15c side.

The end U1A1S9M of the in-slot conductor U1A1S9 is connected to the end U1A2S10M of the in-slot conductor U1A2S10. The in-slot conductor U1A2S10 is integral with the in-slot conductor U1A1S10 on the connecting portion 15c side. The end U1A1S10M of the in-slot conductor U1A1S10 is connected to the end U1D2S9M of the in-slot conductor U1D2S9 inserted in the slot TS16.
Thus, the coil composed of U1A is connected to the end U1B1S1M of the in-slot conductor U1B1S1 inserted in the slot TS34 by the end U1A2S1M of U1A2S1 located on the outermost periphery of the in-slot conductor inserted in the slot TS28. After being connected and wound in the coil, it is connected to the in-slot lead U1D2S9 inserted in the slot TS16 by the in-slot lead U1A1S10 located at the innermost periphery.

(Configuration of segment coil)
One segment coil 15 used for the in-slot conducting wires S1 to S10 will be described.
An example of the segment coil 15 used in this embodiment is shown in FIG. The segment coil 15 is formed by forming a rectangular conductor wire with a coating on the surface of a rectangular copper wire having a cross section of about 1.8 mm in length and about 3.3 mm in width. The segment coil 15 includes two straight portions 15d1 and 15d2 and a connecting portion 15c that connects the straight portion 15d1 and the straight portion 15d2. A step 15e for changing the lane is formed at an intermediate position of the connecting portion 15c. At the ends of the straight line portion 15d1 and the straight line portion 15d2 of the segment coil 15, an end portion M (indicated by adding “M” at the end when indicating the end portion of the in-slot conducting wire) is formed.
The shape of the segment coil 15 shown in FIG. 13 is an example, and in this embodiment, more than ten types of segment coils 15 having different shapes are used.

<Configuration of individual insulation insulator>
FIG. 6 shows a front view of the individual insulating insulator 5.
The individual insulating insulator 5 is an insulating paper inserted so that the end M of the segment coil 15 does not come into contact with the end M of another segment coil. In the present embodiment, for example, PPS is used for the material of the individual insulating insulator 5. The reason why PPS is used is that heat resistance, oil resistance, chemical resistance, insulation, and the like are taken into consideration so as to withstand heat during welding.

As shown in FIG. 6, the individual insulation insulator 5 has a substantially rectangular shape. The pair of corners are chamfered to form a chamfer 51. In the present embodiment, the angle θ of the chamfered portion 51 is about 65 degrees. The angle θ represents the angle of the chamfered portion 51 when the short side 5a of the individual insulating insulator 5 is the bottom side.
The individual insulating insulator 5 is formed with a first cut hole 52 and a second cut hole 53 in order to insert the end M of one segment coil 15. In this embodiment, the shape of the 1st cut hole 52 and the 2nd cut hole 53 is a rhombus shape. The first notch hole 52 and the second notch hole 53 are formed in a portion of the individual insulating insulator 5 that is separated in the longitudinal direction.

FIG. 1 shows a conceptual diagram of a stator manufacturing process (1), and FIG. 2 shows a conceptual diagram of a stator manufacturing process (2). 1 and 2 show the circular stator as a plane, and therefore the segment coils are shown side by side in the same shape. However, since the actual stator is circular, it differs from the drawings.
As shown in FIG. 1, the individual insulation insulator 5 corresponding to each end M of the segment coil 15 is prepared. Subsequently, as shown in FIG. 2, the individual insulating insulator 5 is inserted for each end M.

The insertion of the individual insulation insulator 5 of FIG. 2 will be specifically described with reference to FIG. FIG. 7 shows a front view of a state in which the individual insulating insulator 5 is inserted into the end M of one segment coil 15.
As shown in FIG. 7, the second cut hole 53 comes to the back with respect to the end M of the segment coil 15. Therefore, the second cut hole 53 is first inserted into the end M of the individual insulating insulator 5. In that case, it inserts with respect to the front from the back of the separate insulation insulator 5 so that the edge part M may come out to the surface side in FIG. Subsequently, the end M is inserted into the first cut hole 52 of the individual insulating insulator 5 from the front to the rear. Thereby, the state shown in FIGS. 7 and 2 is obtained.

  Since the first cut hole 52 and the second cut hole 53 of the individual insulating insulator 5 have a rhombus shape, they can be fixed to the end M of the segment coil 15 having a rectangular cross section. That is, four sides of the rhombus of the first cut hole 52 and the second cut hole 53 are in contact with the four corners of the segment coil 15 having a flat cross section. The individual insulating insulator 5 can be fixed to the end M of one segment coil 15 by contacting the four sides and the four corners. Therefore, the individual insulation insulator 5 does not rotate and can always be positioned at the end M. Therefore, since a gap can be reliably formed and a distance can be opened, insulation can be reliably performed.

As shown in FIG. 3 and FIG. 8, the in-slot conductors that are segment coils are twisted to cross over five in-slot conductors that are other segment coils.
For example, as shown in FIG. 8, the in-slot conducting wire U1A1S1 is twisted so that the other in-slot conducting wires U2A1S2, V1A1S2, V2A1S2, W1A1S2, and W2A1S2 are straddled. Therefore, the in-slot conductor U1A1S1 is in contact with the other in-slot conductors U2A1S2, V1A1S2, V2A1S2, W1A1S2, and W2A1S2.
The other in-slot conductors also have a shape in which five other in-slot conductors are crossed and contacted in the same manner as the in-slot conductor U1A1S1.

An individual insulating insulator 5 is fixed to a portion where the in-slot conductor U1A1S1 contacts with the other in-slot conductors U2A1S2, V1A1S2, V2A1S2, W1A1S2, and W2A1S2. Therefore, the individual insulation insulator 5 exists between the in-slot conductor U1A1S1 and the other in-slot conductors U2A1S2, V1A1S2, V2A1S2, W1A1S2, and W2A1S2, and does not come into direct contact with each other. Therefore, an insulation state can be ensured reliably.
In the present embodiment, the in-slot conductor U1A1S1 has been described, but the other in-slot conductors can similarly ensure insulation.

Further, when the in-slot conductors U1A1S1, U2A1S1, etc. are twisted as shown in FIG. 8, a gap H is formed between, for example, the in-slot conductors U1A1S1 and the individual insulating insulator 5 fixed to U2A1S1. The gap H is a gap formed because the individual insulating insulator 5 is individually fixed to the in-slot conductors U1A1S1, U2A1S1, and the like. By forming the gap H, when the cooling medium flows through the segment coil 15, the cooling medium flows through the gap H and can spread the cooling medium in the radial direction of the stator.
A gap H is similarly formed between the other individual insulating insulators 5.

In addition, a cut hole for inserting the end M of the segment coil 15 is formed in two places, the first cut hole 52 and the second cut hole 53. As shown in FIG. 6, the first cut hole 52 and the second cut hole 53 are located in parallel positions, so that the individual insulating insulator 5 can be easily inserted into the end M which is the end of the segment coil 15. Can be fixed.
Further, the individual insulating insulator 5 can be fixed to the segment coil 15 by inserting the end M into the second cut hole 53 and subsequently inserting the end M into the first cut hole 52. In particular, since the segment coil 15 has a rectangular cross section, the individual insulating insulator 5 is fixed without rotating by being inserted into the first cut hole 52 and the second cut hole 53 having a rhombus shape. By fixing the individual insulating insulator 5, it is possible to reliably take a distance from the other end M and to insulate reliably.
Although the segment coil 15 has been described in the present embodiment, the same effects can be achieved even with segment coils of other shapes.

The in-slot conductor U1A1S1 is twisted to form a corner portion K (indicated by adding “K” at the end when the corner portion of the in-slot conductor to be configured is shown). Since the corner portion U1A1S1K is in a twisted state, the outer periphery of the corner portion has a substantially circular shape. Therefore, there is no acute corner on the outer periphery of the corner, and no conductor is present at the corner.
A chamfered portion 51 of the individual insulating insulator 5 is formed in a portion corresponding to the outer periphery of the corner portion of the corner portion U1A1S1K. Even if the chamfered portion 51 of the individual insulating insulator 5 is formed and the insulating paper is chamfered, the conductor does not exist in the corresponding portion, so that the insulation is not affected at all.
Although only the corner portion U1A1S1K has been described in the present embodiment, chamfered portions 51 are formed in portions corresponding to the other corner portions K, respectively.
On the other hand, since the individual insulating insulator 5 is formed with the chamfered portion 51, a portion that does not require insulating paper can be reduced, so that the material cost can be reduced.

Since the chamfered portion 51 is formed in the individual insulating insulator 5, the area protruding from the segment coil 15 is reduced. Therefore, the individual insulation insulator 5 does not interfere with the other segment coils 15 and the other individual insulation insulators.
In addition, since only the portion where the individual insulation insulator is necessary, the material cost can be reduced.
As shown in FIG. 8, the chamfered portion 51 of the individual insulating insulator 5 is formed on both adjacent end portions. Therefore, even when the end M is twisted, the adjacent individual insulating insulator 5 does not get in the way. Therefore, the end M can be easily twisted.

<Effect of motor>
In the state shown in FIG. 4, the cooling medium is caused to flow into the stator 1 from above in the drawing. The in-slot lead is directly cooled by flowing a cooling medium. Thereby, it is possible to prevent the motor temperature from decreasing and the electrical resistance from increasing, and it is possible to prevent the output efficiency of the motor from decreasing. Moreover, the thermal deterioration of the varnish applied to the segment coil or the individual insulating insulator 5 can be prevented.

In particular, in the present embodiment, when a cooling medium is introduced as shown in FIG. 5, the cooling medium can directly touch the in-slot lead without being disturbed by the individual insulating insulator 5. Therefore, the in-slot conductor can be efficiently cooled. That is, since the individual insulation insulator 5 is individually fixed with respect to the segment coil 15, even if the cooling medium flows, it can flow in the radial direction of the stator 1 and cool the segment coil existing in the radial direction. be able to. For example, as shown in FIG. 5, the cooling medium that has touched the in-slot conductor U2A1S1 flows in the left-right direction without the individual insulating insulator 5A interfering. The cooling medium that flows in the left-right direction of the in-slot conductor U2A1S1 can touch the other in-slot conductors U2A1S2, U2A1S3, U2A1S4,. Therefore, the cooling medium can touch the radial in-slot conductors U2A1S2, U2A1S3, U2A1S4.
In addition, the cooling medium that flows in the left-right direction of the in-slot conductor U2A1S1 flows not only in the radial direction but also in the circumferential direction. Therefore, the cooling medium that has flowed in the left-right direction of the in-slot conductor U2A1S1 can touch the other in-slot conductors U1A1S1, V1A1S1,. Therefore, it is possible to directly cool the in-slot conductors U1A1S1, V1A1S1,.
Note that the partially enlarged conceptual diagram of the stator shown in FIG. 5 is a conceptual diagram illustrating the effects when the individual insulating insulator 5 in the present embodiment is used in an easy-to-understand manner. That is, the in-slot conductor shown in FIG. 5 is the effect of the individual insulating insulator 5 in a state where the end of the in-slot conductor is twisted as shown in FIG. This is because the in-slot conductor is used in a twisted state as shown in FIG. 8, and is cooled in the twisted state.

As described above in detail, the stator according to the present embodiment has the following operational effects.
The cooling medium flows from the gap H between the individual insulating insulators 5 because the individual insulating insulators 5 are individually inserted into the end portions M that are the end portions of the linear portions 15 d of the segment coils 15. Therefore, the cooling medium can flow in the radial direction of the stator 1. By allowing the cooling medium to reach the center of the stator 1, the cooling efficiency of the entire stator 1 can be improved.
In addition, the cooling medium can flow not only in the radial direction of the stator 1 but also in the circumferential direction.
In addition, since the insulating insulator can be used as the individual insulating insulator 5 only in a place where the insulation is necessary, which may cause the segment coils 15 to come into contact with each other, the extra insulating insulator can be eliminated. Therefore, the material cost concerning an insulating insulator can be reduced.
Moreover, since the individual insulation insulator 5 is inserted for every segment coil 15, the position shift of the individual insulation insulator 5 can be prevented, and the segment coils 15 can be reliably insulated from each other.

The individual insulation insulator 5 is formed with two first cut holes 52 and second cut holes 53 into which the segment coils 15 are inserted, and the both cut holes are located in parallel positions. 5 can be easily inserted into the end M of the segment coil 15 and fixed.
Further, for example, the individual insulating insulator 5 can be fixed to the segment coil 15 by inserting the end M into the second cut hole 53 and further inserting the end M into the first cut hole 52. In particular, since the segment coil 15 has a flat rectangular shape, the individual insulating insulator 5 is fixed without rotating by inserting the end portions of the segment coil 15 into the first cut hole 52 and the second cut hole 53. . Since the individual insulating insulator 5 is fixed, the distance between the segment coils 15 can be surely taken, so that the insulation can be reliably performed.

(Modified example in which a tear prevention hole is formed in the cut hole of the individual insulation insulator)
The modification of FIG. 9 is different from the individual insulating insulator 5 shown in FIG. 6 only in that a tear prevention hole is formed at both ends of the cut hole. Since other configurations and operational effects are the same, a detailed description of other portions is omitted.
Breaking prevention holes 63 are formed at opposite corners of the diamond-shaped cut holes 62 of the individual insulating insulator 61 of FIG. The opposite corners referred to here are corners in which a line connecting the corners is parallel to the short side 61A. This is because when the segment coil 15 is inserted into the cut hole 62, the most widened portion is the corner portion.
By forming the tear prevention hole 63, it is possible to prevent the cut hole 62 from being torn and torn even when the segment coil 15 is inserted into the normal cut hole 62. Therefore, since the notch hole 62 is avoided and the repulsive force against the segment coil 15 is not weakened, the fixing force of the individual insulating insulator 61 can be maintained.

(Modified example in which fluid hole is formed in individual insulation insulator)
FIG. 10 shows a front view of a modification (1) of the individual insulation insulator, FIG. 11 shows a front view of the modification (2), and FIG. 12 shows a front view of the modification (3).
10 to 12 is different from the individual insulation insulator 5 shown in FIG. 6 only in that a fluid hole for allowing the cooling medium to flow is formed. Since other configurations and operational effects are the same, a detailed description of other portions is omitted.
In the individual insulation insulator 71 of FIG. 10, a plurality of horizontal slit fluid holes 72 formed in parallel with the short sides 71 </ b> A of the individual insulation insulator 71 are formed.
In the individual insulation insulator 73 of FIG. 11, a plurality of water hole-shaped fluid holes 74 are formed.
In the individual insulation insulator 76 of FIG. 12, a plurality of vertical slit fluid holes 77 formed in parallel with the long side 76 </ b> B of the individual insulation insulator 76 are formed.

  As shown in the modified examples of FIGS. 10 to 12, the fluid holes 72, 74, and 77 are formed in the individual insulating insulators 71, 73, and 76, so that the cooling medium is the individual insulating insulators 71, 73, and 76. Can flow between. Since the cooling medium can flow, the cooling medium can easily flow in the radial direction of the stator 1. Therefore, the cooling medium can reach the central portion of the stator 1, so that the cooling efficiency of the entire stator 1 can be improved.

Note that the present invention is not limited to the above-described embodiment, and various applications are possible without departing from the spirit of the invention.
For example, in the present embodiment, the cut hole has a rhombus shape, but may be a cut line. By using the cut line, it becomes easy to form the cut hole, and the cost can be reduced.

  For example, the tear prevention hole of FIG. 9 and the fluid holes 72, 74, 77 of FIGS. 10 to 13 can be combined. By combining them, the individual insulating insulator can have a repulsive force over a long period of time by making the cut hole difficult to break, so that the individual insulating insulator can be fixed to the segment coil. Further, since the fluid hole is formed in the individual insulating insulator, the cooling medium can easily flow in and the temperature of the stator can be prevented from rising. Therefore, by combining both, it is possible to prevent the individual insulation insulator from being thermally deteriorated, and the individual insulation insulator can be fixed to the segment coil for a long period of time.

DESCRIPTION OF SYMBOLS 1 Stator 20 Stator core T1-T48 Teeth TS1-TS48 Slot 5 Individual insulation insulator 51 Chamfer 52 First cut hole 53 Second cut hole 15 Segment coil M End part 15c Connection part 15d Straight part H Clearance

Claims (5)

A stator core having a plurality of slots in a radial shape, a pair of linear portions provided in the slot in the radial direction of the stator core, and a segment coil configured in a U shape by a connecting portion, and an end portion of the linear portion In a stator having an insulating insulator in between,
Individual insulating insulators are individually inserted into the end portions,
Stator characterized by. The stator according to claim 1,
In the individual insulation insulator, cut holes for inserting the segment coils are formed in two places,
The two cut holes are located in parallel positions;
Stator characterized by. The stator according to claim 2,
A tear prevention hole is formed at both ends of the cut hole,
Stator characterized by. The stator according to any one of claims 1 to 3,
A fluid hole is formed to allow fluid to flow into the individual insulating insulator;
Stator characterized by. The stator according to any one of claims 1 to 4,
The corners of the individual insulation insulators are chamfered;
Stator characterized by.

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