JP2020137289A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine which can match positions of both coils to be divided in a slot with high accuracy, and is effective for cooling each coil.SOLUTION: A rotary electric machine comprises: a first end board 201 forming a first coil group 301a in a state of holding a plurality of segment coils 111; and a second end board 202 forming a second coil group 301b in a state of holding a plurality of segment coils 112. By contacting the first end board 201 and the second end board 202 with an axial direction end surface of a stator core 101, the first coil group 301a and the second coil group 301b are connected in a slot 102. Both the plurality of segment coils 111 in the first end board 201 and the first coil group 301a and the plurality of segment coils 112 in the second end board 202 and the second coil group 301b are in contact with at least three surfaces in a curvature part of each of the segment coils 111 and 112.SELECTED DRAWING: Figure 4

Description

The present invention relates to a rotary electric machine.

Due to the growing awareness of global environmental protection, the automobile industry is also shifting from the conventional internal combustion engine drive to electrification by a motor that does not emit greenhouse gases when driven. Batteries that supply electricity to motors are expensive and the weight that can be mounted on a vehicle is limited, so high efficiency of the motor is required.

It is necessary to reduce the loss of the motor in order to improve the efficiency. Most of the motor loss is iron loss of the core material and copper loss of the coil. The iron loss can be reduced depending on the material used, but the loss of the normally used electrical steel sheet changes depending on its thickness and Si content. In addition to electrical steel sheets, the use of high-performance materials such as amorphous materials and nanocrystal materials is also being considered, but these are not only extremely thin at 0.025 mm in thickness, but also have high hardness and brittleness, so they are difficult to manufacture. There are a lot of challenges.

On the other hand, in order to reduce the copper loss determined by the resistance value and the current of the coil, it is effective to reduce the resistance value by securing the cross section of the coil as much as possible in the slot of the stator. Therefore, a segment coil that is a square wire is used. Since the motor is required to be small and lightweight, the segment coil protruding from the stator core is bent and used. Patent Document 1 discloses a technique of providing a coil fixing member which is a bending starting point of a segment coil between a stator core and a segment coil.

Further, a technique described in Patent Document 2 has been proposed as a method for assembling a stator. Patent Document 2 discloses a technique in which stator end portions are arranged on both sides of a stator core, and the stator end portions and segment coils are resin-molded and integrated.

JP-A-2017-93224 Japanese Unexamined Patent Publication No. 2006-158044

In the technique described in Patent Document 1, the coil fixing member provided between the stator core and the segment coil can reduce the burden on the stator core in that it serves as a fulcrum when bending the segment coil. .. However, since the bending direction of the segment coil is not limited to one direction but alternates in the radial direction, the holes formed in the coil fixing member are wider than those of the segment coil. For this reason, the holes of the coil fixing member and the segment coil are loosened, and it is difficult to stably support the segment coil. When assembling the stator, there is a technique of dividing the segment coil and connecting the divided segment coils in the slot. However, in the technique described in Patent Document 1, the positions of the segment coils to be combined are varied. It was difficult to assemble.

Further, in the technique described in Patent Document 2 in which the segment coils are divided and assembled, it is possible to suppress variations in the positions of the segment coils by integrating the segment coils with the stator end portion with a resin. However, in the technique described in Patent Document 2, since the segment coil is covered with a resin, there is a problem that the segment coil cannot be sufficiently cooled.

An object of the present invention is to solve the above-mentioned problems, to provide a rotary electric machine which can stably support the coil and accurately align the positions of the divided coils in the slot and which is effective for cooling the coil. There is.

In order to achieve the above object, the present invention has a plurality of coils having straight portions and curved portions and having a rectangular cross section, and a stator having a plurality of slots for accommodating each of the plurality of coils. A rotary electric machine including a core and a rotor core rotatably arranged on the inner peripheral side of the stator core, wherein each of the plurality of coils is held in an inserted state, and a first coil is provided. A first end plate forming a group and a second end plate in which each of the plurality of coils is held in an inserted state to form a second coil group are provided, and the first end plate is the stator. A plurality of coils in the first coil group are housed in the plurality of slots by contacting the axial end surface of the core, and the second end plate is the axial end surface of the stator core on the side opposite to the first end surface. A plurality of coils in the second coil group are housed in the plurality of slots, the first coil group and the second coil group are connected in the slot, and the first end plate and the first end plate are connected to each other. The plurality of coils in one coil group, and the second end plate and the plurality of coils in the second coil group are characterized in that they are in contact with at least three surfaces in the curved portion of the coil.

According to the present invention, it is possible to provide a rotary electric machine that stably supports the coils and can accurately align the positions of the divided coils in the slot and is effective for cooling the coils.

It is a perspective view which shows the stator core and the segment coil which concerns on 1st Example of this invention. It is a perspective view which shows the connection state of the segment which concerns on 1st Example of this invention. It is a perspective view which shows the relationship between the 1st end plate and a segment coil which concerns on 1st Example of this invention. It is a perspective view which shows the coil group held on the 1st end plate which concerns on 1st Example of this invention. It is a perspective view which shows the assembled state of the coil group and the stator core which concerns on 1st Example of this invention. It is a perspective view which shows the coil group held on the 1st end plate which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the coil group held on the 1st end plate which concerns on 3rd Example of this invention. It is a perspective view which shows the coil group held on the 1st end plate which concerns on 4th Embodiment of this invention. It is a partially enlarged perspective view of the stator core which concerns on 4th Embodiment of this invention. It is a perspective view which shows the coil group held on the 1st end plate which concerns on 5th Embodiment of this invention. It is an enlarged perspective view of the guide part which concerns on 5th Embodiment of this invention. It is a perspective view which shows the assembled state of the coil group and the stator core which concerns on 6th Embodiment of this invention. It is sectional drawing of the rotary electric machine along the axial direction which concerns on 7th Embodiment of this invention.

Hereinafter, examples of the rotary electric machine according to the present invention will be described with reference to the drawings. The present invention is not limited to the following examples, and various modifications and applications are included in the technical concept of the present invention.

FIG. 1A is a perspective view showing a stator core and a segment coil according to the first embodiment of the present invention, and FIG. 1B is a perspective view showing a connection state of the segments according to the first embodiment of the present invention.

FIG. 1A shows a structure in which segment coils divided in the middle in the axial direction are connected in the stator core 101 in the first embodiment of the present invention. As shown in FIG. 1A, the stator core 101 is formed by laminating a plurality of electromagnetic steel plates, opening inward in the radial direction, and forming a plurality of slots 102 for accommodating the segment coils 111 and 112. ing. Segment coils 111 and 112 are inserted into the slot 102 from both sides in the axial direction of the slot 102. The segment coils 111 and 112 (coils) are formed in a U shape, and the cross-sectional shape orthogonal to the longitudinal direction is rectangular. The segment coils 111 and 112 are divided so as to be connected in the middle of the stator core 101.

As shown in FIG. 1B, the divided portions of the segment coils 111 and 112 are fixed by fitting the convex portion 111a of the segment coil 111 and the concave portion 112a of the segment coil 112. The shape of the fitting portion of the segment coils 111 and 112 is not limited to unevenness. Other than the combination of unevenness, the connecting surface may be stepped and have only one step. At this time, by making the facing surfaces of the connected square segment coils 111 and 112 parallel to the axial direction of the stator core 101, the surfaces touch each other even if the lengths of the segment coils 111 and 112 vary. It is possible to energize with. The segment coils 111 and 112 may have a shape that can be connected in the slot 102 of the stator core 101.

Further, in the first embodiment, six segment coils 111 and 112 are housed in each of the slots 102 of the stator core 101, and 48 slots 102 are arranged in the circumferential direction. The number of coils and the number of slots in the slot are not limited to this.

The plurality of segment coils 111 and 112 need to be aligned and inserted into the stator core. This means will be described with reference to FIG. FIG. 2 is a perspective view showing the relationship between the first end plate and the segment coil according to the first embodiment of the present invention.

In FIG. 2, the example of the segment coil 111 will be described, but the same applies to the segment coil 112. In FIG. 2, the segment coil 111 is aligned by the first end plate 201 before being inserted into the slot 102 of the stator core 101. The first end plate 201 is made of an insulator such as resin. The first end plate 201 is provided with a plurality of coil insertion holes 201a for inserting the segment coils 111 and holding them one by one. Six coil insertion holes 201a are formed in the radial direction of the first end plate 201. Further, a plurality of coil insertion holes 201a in which six are grouped are provided side by side in the circumferential direction of the first end plate 201. The shape of one of the coil insertion holes 201a is rectangular when viewed from the insertion direction of the segment coil 111. In FIG. 2, six coil insertion holes 201a for accommodating six segment coils per slot are provided, but the present invention is not limited thereto.

The first end plate 201 holds the segment coil 111 at a position that covers the connection portion between the straight portion 121 of the segment coil 111 and the curved portion 123 that becomes the coil end. That is, the segment coil 111 is held at a position several millimeters from the end of the stator core 101. The other straight portion 122 and curved portion 124 of the segment coil 111 are also held by the first end plate 201. At this time, the thickness of the first end plate 201 is limited to a height at which the segment coils 111 do not overlap with the adjacent segment coils in the motor axial direction.

Further, the shape of the coil insertion hole 201a of the first end plate 201 is such that the curved inner peripheral side of the curved portion 123 or 124 of the segment coil 111 is curved along the coil, and the outer peripheral side is the segment coil 111. Is made into a linear shape so that The segment coil 111 has a rectangular cross-sectional shape orthogonal to the longitudinal direction. The first end plate 201 and the segment coil 111 are in contact with each other on four surfaces in the straight portion 121 or 122, and in the curved portion 123 or 124 of the segment coil 111, the side surface on the inner diameter side of the motor, the side surface on the outer diameter side of the motor, and the curved portion 123. Alternatively, it contacts at least three surfaces of the 124 bent inner diameter side surfaces. With these contact surfaces, the first end plate 201 aligns and holds the segment coil 111.

FIG. 3 shows a state in which the segment coils 111 are aligned. FIG. 3 is a perspective view showing a group of coils held on the first end plate according to the first embodiment of the present invention.

In FIG. 3, a plurality of segment coils 111 are inserted into the plurality of coil insertion holes 201a of the first end plate 201 so as to fill the plurality of coil insertion holes 201a. Then, these segment coils 111 are held by the first end plate 201. In a state where a plurality of segment coils 111 are inserted into the coil insertion holes 201a of the first end plate 201, the convex portions 111a of the segment coil 111 are aligned in the radial direction and the circumferential direction. In this way, the first coil group 301a is configured. Although not shown, the same applies to the segment coil 112.

Next, a method of assembling the coil group and the stator core will be described with reference to FIG. FIG. 4 is a perspective view showing an assembled state of the coil group and the stator core according to the first embodiment of the present invention. FIG. 4 shows a state before inserting the first coil group 301a and the second coil group 301b from both ends of the stator core 101 in the motor axial direction.

In FIG. 4, a plurality of segment coils 111 are held in an aligned state on the first end plate 201 to form a first coil group 301a. A plurality of segment coils 112 are held in an aligned state on the second end plate 202 to form a second coil group 301b.

Then, the convex portion 111a of the segment coil 111 forming the first coil group 301a is aligned with the slot 102 of the stator core 101, and the first end plate 201 is pushed toward the stator core 101. When the first end plate 201 comes into contact with the axial end surface of the stator core 101, a part of the segment coil 111 is housed in the stator core 101. Similarly, the recess 112a of the segment coil 112 forming the second coil group 301b is aligned with the slot 102 of the stator core 101, and the second end plate 202 is pushed toward the stator core 101. When the second end plate 202 comes into contact with the axial end surface of the stator core 101 on the side opposite to the first end plate 201, a part of the segment coil 112 is housed in the stator core 101. When the first end plate 201 and the second end plate 202 come into contact with the end faces of the stator core 101, the convex portion 111a of the segment coil 111 and the concave portion 112a of the segment coil 112 are fitted in the slot 102 of the stator core 101. To. In this way, the first coil group 301a and the second coil group 301b are connected in the slot 102.

According to the first embodiment, the stator coil 400 can be assembled accurately by simply pushing the first end plate 201 and the second end plate 202 of the first coil group 301a and the second coil group 301b into the stator core 101. Can be done. Further, according to the first embodiment, the first coil group 301a and the second coil group 301b can be fixed by pressing the first end plate 201 and the second end plate 202, and the workability can be improved. it can.

The coil end portions of the first coil group 301a and the second coil group 301b are exposed from the surfaces fixed by the first end plate 201 and the second end plate 202. Therefore, in the first embodiment, it is possible to cool the coil by bringing the cooling oil into direct contact with the coil end. Further, since the first end plate 201 and the second end plate 202 are in close contact with each coil, it is possible to suppress the infiltration of cooling oil into the stator core.

Although not shown in the first embodiment, a rotor core having a rotating shaft is arranged on the inner peripheral side of the stator core 101 to form a rotating electric machine.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a perspective view showing a group of coils held on the first end plate according to the second embodiment of the present invention. The parts common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment, the difference from the first embodiment is that the outer wall portions 501a and 501b are provided on the first end plate 501.

In FIG. 5, the segment coil 111 is held by the first end plate 501 and constitutes the first coil group 301a. Outer wall portions 501a and 501b extending to the side opposite to the side in contact with the stator core 101 are formed on the outer peripheral side and the inner peripheral side of the first end plate 501. The outer wall portions 501a and 501b are arranged so as to cover a part of the coil end of the segment coil 111 protruding from the first end plate 501. The coil end is cooled by cooling oil. The cooling oil is applied from above the coil end, spreads by its own weight, and comes into contact with the coil end. Since the cooling oil falls and dissipates due to its own weight, a part of the cooling oil may fall without contacting the coil end. Therefore, in the second embodiment, the outer wall portions 501a and 501b are provided on the first end plate 501. The cooling oil that has fallen due to its own weight is captured by the outer wall portions 501a and 501b and brought to the coil end side. According to the second embodiment, since the outer wall portions 501a and 501b are provided on the first end plate 501, the dissipation of the cooling oil can be suppressed and the cooling performance of the coil end can be improved. Further, according to the second embodiment, even a small amount of cooling oil can be effectively brought into contact with the coil end.

In the second embodiment, the length (height) of the outer wall portion 501b is shorter (lower) than that of the outer wall portion 501a, but it may be the same as the length (height) of the outer wall portion 501a.

In addition to oil, various fluids such as air and antifreeze can be used to cool the coil end.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing a group of coils held on the first end plate according to the third embodiment of the present invention. The parts common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the third embodiment, the difference from the first embodiment is that the first end plate 601 is provided with outer wall portions 601a and 601b, and a resin (fixing material) is formed in a portion surrounded by the first end plate 601 and the outer wall portions 601a and 601b. ) Has been poured. In the third embodiment, since the resin 603 is poured into the gaps between the segment coils and cured, the segment coils 111 held by the first end plate 601 can be firmly held.

In FIG. 6, the segment coil 111 is held by the first end plate 601 and constitutes the first coil group 301a. Outer wall portions 601a and 601b extending to the side opposite to the side in contact with the stator core 101 are formed on the outer peripheral side and the inner peripheral side of the first end plate 601. Then, the molten resin 603 is poured into the first end plate 601 surrounded by the outer wall portions 601a and 601b and cured. The outer wall portions 601a and 601b are receiving portions for receiving the resin 603.

The molten resin 603 also enters the gap between the segment coils overlapping in the axial direction, and can firmly hold the segment coil 111 held by the first end plate 601. The material for solidifying the segment coil is not limited to resin, and may be a fixing material such as an adhesive.

According to the third embodiment, since the fixing material is provided in the portion surrounded by the first end plate 601 and the outer wall portions 601a and 601b, the segment coil 111 held by the first end plate 601 is firmly held. be able to.

In the third embodiment, one first end plate 601 has been described, but the other second end plate facing the stator core 101 has the same configuration.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG. 7 is a perspective view showing a coil group held by the first end plate according to the fourth embodiment of the present invention, and FIG. 8 is a partially enlarged perspective view of the stator core 101 according to the fourth embodiment of the present invention. It is a figure. The parts common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the fourth embodiment, the difference from the first embodiment is that the recessed portion 702 is provided in the first end plate 701.

In FIG. 7, the segment coil 111 is held by the first end plate 701 and constitutes the first coil group 301a. A recessed portion 702 that matches the position of the slot 102 of the stator core 101 is provided on the surface of the first end plate 701 on the stator core side. The segment coils 111 are arranged side by side in the radial direction in one slot 102. Therefore, in order to ensure the insulation between the segment coils 111, a plurality of insulating papers 801 covering each of the plurality of segment coils 111 are arranged in the slot 102 as shown in FIG. 8, and the segment coils 111 are arranged with each other. Insulation distance is secured. The insulating paper 801 is arranged so that a part of the insulating paper 801 protrudes in the axial direction from the end face of the stator core 101, and the protruding part is also arranged between the segment coil 111 and the stator core 101 to ensure insulation. Therefore, the shape of the recessed portion 702 provided in the first end plate 701 is such that the portion protruding from the end surface of the stator core 101 fits when the insulating paper 801 is bent in the slot 102. A plurality of recesses 702 are provided, and the same number as the insulating paper 801 is formed. Further, the depth of the recessed portion 702 is set to be deeper than the length of the insulating paper 801 protruding in the motor axial direction from the stator core 101 and shallower than the thickness of the first end plate 701. Here, the insulation between the segment coils 111 and between the segment coil 111 and the stator core 101 is secured by the insulating paper, but the method of insulation is not limited to the insulating paper. For example, a slot guide in which a guide is provided between the segment coils may be used, or a bobbin may be used.

According to the fourth embodiment, the recessed portion 702 having the same shape as the slot 102 of the stator core 101 is provided on the surface of the first end plate 701 on the stator core side so that the insulating paper 801 can be accommodated. The insulation property of the segment coil 111 exposed from the first end plate 701 can be ensured.

In the fourth embodiment, one first end plate 701 has been described, but the other second end plate facing the stator core 101 has the same configuration.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 is a perspective view showing a coil group held on the first end plate according to the fifth embodiment of the present invention, and FIG. 10 is an enlarged perspective view of a guide portion according to the fifth embodiment of the present invention. is there. The parts common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the fifth embodiment, the difference from the first embodiment is that the first guide portion 911 is provided on the first end plate 901.

In FIG. 9, the segment coil 111 is held by the first end plate 901 and constitutes the first coil group 301a.

In FIG. 9, a first guide portion 911 extending toward the slot 102 side of the stator core 101 is formed on the outer peripheral side and the inner peripheral side of the first end plate 901. The first guide portions 911 are arranged in the same number as the number of segment coils 111, and cover the individual periphery of the plurality of segment coils 111 extending from the first end plate 901 toward the slot 102 side of the stator core 101. Placed in. That is, the first guide portion 911 secures the insulating property between the segment coils 111, and has the same function as the insulating paper 801 of the fourth embodiment.

Further, a second guide portion 912 is formed on the segment coil 112 side in the same manner as described above, and is arranged so as to cover the periphery of the segment coil 112 one by one. Then, in the slot 102 of the stator core 101, the convex portion 111a of the segment coil 111 and the concave portion 112a of the segment coil 112 are fitted, and the first guide portion 911 and the second guide portion 912 are fitted. If the segment coil is not completely covered by the guide portion, the insulation distance becomes short and the insulation cannot be ensured. A means for solving this will be described with reference to FIG.

In FIG. 10, a part of the tip portion (slot side) of the first guide portion 911 is cut out from the outer peripheral surface toward the inner peripheral surface, and a first thin-walled portion 911a formed in a stepped shape is formed. Further, a part of the tip portion (slot side) of the second guide portion 912 is cut out from the inner peripheral surface toward the outer peripheral surface, and a second thin-walled portion 912a formed in a stepped shape is formed.

Then, when the segment coil 111 and the segment coil 112 are abutted in the slot 102 of the stator core 101, the convex portion 111a of the segment coil 111 and the concave portion 112a of the segment coil 112 are fitted to each other, and the first guide portion 911 The first thin-walled portion 911a and the second thin-walled portion 912a of the second guide portion 912 overlap each other. That is, the first thin-walled portion 911a slides into the inner peripheral side of the second thin-walled portion 912a.

In the fifth embodiment, in the slot 102 of the stator core 101, the segment coil 111 and the segment coil 112 are covered by the first guide portion 911 and the second guide portion 912, so that between the segment coils and the segment coil Insulation between the stator cores can be ensured.

In the fifth embodiment, the first thin-walled portion 911a and the second thin-walled portion 912a are formed at the tips of the first guide portion 911 and the second guide portion 912, and the two are overlapped to ensure the insulating property. , The present invention is not limited to this. For example, the diameter of the tip portion of one guide portion may be widened so that the other guide portion is inserted into the widened portion so that the two guide portions overlap.

Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 11 is a perspective view showing an assembled state of the coil group and the stator core according to the sixth embodiment of the present invention.
The parts common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the sixth embodiment, the difference from the first embodiment is that the coil group and the stator core are fastened with bolts.

FIG. 11 shows a state before the first coil group 301a and the second coil group 301b are inserted from both ends of the stator core 101 in the motor axial direction.

In FIG. 11, segment coils 111 and 112 are aligned on the first end plate 201 and the second end plate 202, respectively, and are held as the first coil group 301a and the second coil group 301b. Further, the first end plate 201 is provided with a first fastening portion 201b protruding outward in the radial direction from the outer circumference of the first end plate 201. The second end plate 202 is provided with a second fastening portion 202b that projects radially outward from the outer circumference of the second end plate 202. Further, the stator core 101 is provided with a third fastening portion 101a that protrudes radially outward from the outer circumference of the stator core 101. Fastening holes for passing stud bolts 1101 (bolts) are formed in the first fastening portion 201b, the second fastening portion 202b, and the third fastening portion 101a, respectively.

Then, the convex portion 111a of the segment coil 111 forming the first coil group 301a is aligned with the slot 102 of the stator core 101, and the first end plate 201 is pushed toward the stator core 101. The segment coil 111 is inserted into the stator core 101. Similarly, the recess 112a of the segment coil 112 forming the second coil group 301b is aligned with the slot 102 of the stator core 101, and the second end plate 202 is pushed toward the stator core 101. The segment coil 112 is inserted into the stator core 101. When the first end plate 201 and the second end plate 202 come into contact with the end faces of the stator core 101, the convex portion 111a of the segment coil 111 and the concave portion 112a of the segment coil 112 are fitted in the slot 102 of the stator core 101. To.

In this state, the first fastening portion 201b formed on the first end plate 201, the second fastening portion 202b formed on the second end plate 202, and the third fastening portion 101a formed on the stator core 101. The holes formed in each of the holes coincide with each other when viewed from the axial direction, and the stud bolt 1101 is passed through the holes. When the insertion of the stud bolt 1101 into the hole is completed, the nuts are tightened from both ends of the stud bolt 1101.

According to the sixth embodiment, the stator coil 400 can be assembled accurately by simply pushing the first end plate 201 and the second end plate 202 of the first coil group 301a and the second coil group 301b into the stator core 101. Can be done. Further, according to the first embodiment, the first coil group 301a and the second coil group 301b can be fixed by pressing the first end plate 201 and the second end plate 202, and the workability can be improved. it can. Further, since the stator core 101 is sandwiched between the first end plate 201 and the second end plate 202 and these parts are fastened by using the stud bolt 1101, the first coil group 301a and the second coil group The 301b can be firmly fixed to the stator core 101, and the reliability can be improved.

Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 12 is a cross-sectional view of a rotary electric machine along the axial direction according to the seventh embodiment of the present invention. The parts common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the seventh embodiment, the difference from the sixth embodiment is that the upper lid member 141 and the lower lid member 142 press the first end plate 201 and the second end plate 202.

In FIG. 12, on the outer peripheral side of the stator core 101, a cylindrical member 140 that fixes the stator core 101, constitutes an outer shell of a rotary electric machine, and is open on both sides in the axial direction is arranged. The configurations of the segment coils 111, 112, the first end plate 201, and the second end plate 202 arranged in the stator core 101 are the same as those in the first embodiment.

A rotor core 130 to which the rotating shaft 131 is fixed is arranged on the inner peripheral side of the stator core 101. An upper lid member 141 and a lower lid member 142 are arranged at both end openings of the tubular member 140 so as to close the openings. The upper lid member 141 is formed with an upper holding rib 141a extending toward the stator core 101. Similarly, the lower lid member 142 is formed with a lower holding rib 142a extending toward the stator core 101. Further, an upper bearing 132a that rotatably supports the rotating shaft 131 is fixed to the upper lid member 141. A lower bearing 132b that rotatably supports the rotating shaft 131 is fixed to the lower lid member 142. The rotor core 130 is rotatably supported inside the stator core 101 by supporting the rotating shaft 131 by the upper bearing 132a and the lower bearing 132b.

The upper lid member 141 is arranged in one opening of the tubular member 140, and is fixed to the tubular member 140 by a bolt 150. The upper lid member 141 closes one opening of the tubular member 140. At this time, the upper holding rib 141a formed on the upper lid member 141 comes into contact with the first end plate 201 and restricts the movement of the first end plate 201 in the upward direction (direction away from the stator core 101).

The lower lid member 142 is arranged in the other opening of the tubular member 140 and is fixed to the tubular member 140 by bolts 151. The lower lid member 142 closes the other opening of the tubular member 140. At this time, the lower holding rib 142a formed on the lower lid member 142 comes into contact with the second end plate 202 and restricts the downward movement of the second end plate 202 (the direction away from the stator core 101).

According to the seventh embodiment, the first end plate 201 and the second end plate 202 are pressed by the upper pressing rib 141a formed on the upper lid member 141 and the lower pressing rib 142a formed on the lower lid member 142. Therefore, the coil group can be firmly fixed to the stator core 101 simply by fixing the upper lid member 141 and the lower lid member 142 to the tubular member 140 using bolts 150 and 151, and the reliability can be improved. Can be done.

The present invention is not limited to the above-described examples, and includes various modifications. The above-described examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations.

101 ... Stator core, 101a ... Third fastening part, 102 ... Slot, 111, 112 ... Segment coil, 111a ... Convex part, 112a ... Recessed part, 121, 122 ... Straight part, 123, 124 ... Curved part, 141 ... Upper lid Member, 141a ... Upper holding rib, 142 ... Lower lid member, 142a ... Lower holding rib, 150, 151 ... Bolt, 201,501,601,701,901 ... First end plate, 201a ... Coil insertion hole, 202 ... 2 end plate, 301a ... 1st coil group, 301b ... 2nd coil group, 501a, 501b, 601a, 601b ... outer wall part, 603 ... resin, 702 ... recessed part, 801 ... insulating paper, 911 ... 1st guide part, 912 ... 2nd guide part, 911a ... 1st thin wall part, 912a ... 2nd thin wall part, 201b ... 1st fastening part, 202b ... 2nd fastening part 1101 ... Stud bolt

Claims (8)

A plurality of coils having a straight portion and a curved portion and having a rectangular cross section,
A stator core in which a plurality of slots for accommodating each of the plurality of coils are formed, and
A rotary electric machine including a rotor core rotatably arranged on the inner peripheral side of the stator core.
A first end plate in which each of the plurality of coils is held in an inserted state to form a first coil group, and
A second end plate in which each of the plurality of coils is held in an inserted state and forms a second coil group is provided.
By contacting the first end plate with the axial end surface of the stator core, a plurality of coils in the first coil group are housed in the plurality of slots.
By contacting the second end plate with the axial end surface of the stator core on the side opposite to the first end plate, a plurality of coils in the second coil group are housed in the plurality of slots.
The first coil group and the second coil group are connected in the slot.
A plurality of coils in the first end plate and the first coil group, and a plurality of coils in the second end plate and the second coil group are in contact with at least three surfaces in the curved portion of the coil. Rotating electric machine. In claim 1,
The first end plate and the plurality of coils in the first coil group, and the second end plate and the plurality of coils in the second coil group are characterized in that they are in contact with four surfaces in the straight portion of the coil. Rotating electric machine to do. In claim 1 or 2,
A rotary electric machine characterized in that an outer wall portion extending to a side opposite to the side in contact with the stator core is formed on the outer peripheral side and the inner peripheral side of the first end plate. In claim 3,
A rotary electric machine characterized in that a fixing material is provided in a portion surrounded by the first end plate and the outer wall portion. In claim 1 or 2,
A plurality of insulating papers covering each of the plurality of coils are arranged on the stator core.
The rotary electric machine is characterized in that the first end plate and the second end plate are formed with a plurality of recessed portions for accommodating the plurality of insulating papers protruding from the end faces of the stator core. In claim 1 or 2,
On the first end plate, a first guide portion is arranged so as to extend toward the slot side and cover each of the plurality of segment coils.
A second guide portion is arranged on the second end plate so as to extend toward the slot side and cover each of the plurality of segment coils.
A rotary electric machine characterized in that the tip end portion of the first guide portion and the tip end portion of the second guide portion are arranged so as to overlap each other. In claim 1 or 2,
The first end plate has a first fastening portion that protrudes radially outward from the outer circumference.
The second end plate has a second fastening portion that protrudes radially outward from the outer circumference.
The stator core has a third fastening portion that protrudes radially outward from the outer circumference.
A bolt was passed through the fastening holes formed in each of the first fastening portion, the second fastening portion, and the third fastening portion to fix the first coil group, the second coil group, and the stator core. A rotating electric machine characterized by that. In claim 1 or 2,
A tubular member arranged on the outer circumference of the stator core and having both sides open in the axial direction,
An upper lid member that closes one opening of the tubular member and
With a lower lid member that closes the other opening of the tubular member,
An upper holding rib extending toward the stator core is formed on the upper lid member.
A lower holding rib extending toward the stator core is formed on the lower lid member.
The upper holding rib is in contact with the first end plate in a state where the upper lid member closes one of the openings.
The lower holding rib is a rotary electric machine characterized in that the lower lid member contacts the second end plate in a state where the other opening is closed.

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