JP7347965B2 - Stator used in rotating electrical machines - Google Patents

Description

The present invention relates to a stator used in a rotating electric machine.

Toward the realization of a sustainable society these days, rotating electric machines are required to be smaller and more efficient in order to save energy, and it is especially important for rotating electric machines for mobile objects such as automobiles to be lighter and smaller.

Such a rotating electrical machine includes, for example, a rotor equipped with a plurality of permanent magnets, a stator core provided opposite to the rotor, and a stator core provided with an opening on the inner circumferential side of the stator core. As a rotating electrical machine equipped with a permanent magnet that has stator windings wound in a large number of slots, temporarily formed segment coils are inserted into the slots to insulate between the stator core and the coils in the slots. A B-shaped insulating paper is known (see Patent Document 1).

Further, in order to increase the output of automobile motors, the voltage has increased from 12V to 48V, 100V, 300V, and 600V, and high voltage compatibility is required.

Japanese Patent Application Publication No. 2012-147674

The coils in the slots are insulated from the stator core and adjacent coils via bobbins made of insulating paper or resin.

In this case, it is necessary to ensure an insulating distance between the coil having a potential and the metal core. Insulation distance is the straight line distance between the coil and the external metal for areas without insulating paper, and if there is insulating paper, it is the distance from the coil to the external metal along the insulating paper; the latter is called creepage distance. .

In a normal stator, as shown in FIG. 9 of Patent Document 1, the insulating paper is generally about 5 mm longer in the axial direction from the core in order to ensure the creepage distance of the coil.

The coil is housed within this insulating paper, but the coil is bent outside the slot. If the insulating paper is bent along with the coil, the insulating paper may tear and result in a defective product.

Therefore, the problem with motor stators is that they have a high defective rate.

Furthermore, in order to achieve high output and high voltage, it is necessary to thicken the insulating paper, which is an insulator. The thicker the insulating paper, the more likely it is to tear when bent with the coil.

The present invention has been made in view of the above-mentioned problems, and its object is to provide a rotor with an insulating structure that can suppress the occurrence of damage even if the coil of the stator is bent outside the slot. The goal is to realize a stator used in electrical machinery.

In order to achieve the above object, the present invention is configured as follows.

A stator used in a rotating electric machine includes: a stator core in which a plurality of slots are formed; a plurality of coils arranged in a radial direction of the stator core in each of the plurality of slots; an insulator that surrounds one or more of the coils, and the insulator surrounds the stator core with respect to at least one of the coils disposed on the inner peripheral side of the stator core in the slot. At least two layers overlap in the radial direction of the stator core, and one layer exists in the circumferential direction of the stator core , and the insulator is an insulating paper made by bending, and the insulating paper on the inner peripheral side of the slot The starting end is formed between the two coils, surrounds the two coils in a substantially S-shape, and ends between the two coils, and is formed to have three layers of insulating paper between the two coils. , the starting end of the insulating paper on the outer circumferential side of the slot starts from the side of the two coils, and after winding one coil, winding another coil in a substantially B shape, the coil where the starting end is located The end portion is at the same side of the coil as the side surface, and two sheets are formed so as to overlap.
In addition, in a stator used for a rotating electric machine, a stator core having a plurality of slots formed therein, and a plurality of coils arranged in a plurality of slots along the radial direction of the stator core are arranged in each of the plurality of slots. , an insulator surrounding one or more of the coils, the insulator being fixed to at least one of the coils disposed on the inner peripheral side of the stator core of the slot. At least two layers overlap in the radial direction of the child core, and one layer overlaps in the circumferential direction of the stator core, the insulator is an insulating paper made by folding, and the coil in the slot is They are surrounded one by one or two by two with insulating paper, and the insulating paper has two first insulating papers that overlap in the circumferential direction and a second insulating paper that overlaps in the radial direction, and each of the slots is surrounded by insulating paper. Two sheets of insulating paper on the innermost periphery overlap in the radial direction .
In addition, in a stator used for a rotating electric machine, a stator core having a plurality of slots formed therein, and a plurality of coils arranged in a plurality of slots along the radial direction of the stator core are arranged in each of the plurality of slots. , an insulator surrounding one or more of the coils, the insulator being fixed to at least one of the coils disposed on the inner peripheral side of the stator core of the slot. At least two layers overlap in the radial direction of the child core, and one layer overlaps in the circumferential direction of the stator core, the insulator is an insulating paper made by folding, and the Insulating paper wraps two coils with a sheet of insulating paper, starts between the two coils, wraps the inner coil once, wraps around the outer coil once, and then wraps it around the outer coil. It is wound and formed so that two sheets of insulating paper overlap in the radial direction.
In addition, in a stator used for a rotating electric machine, a stator core having a plurality of slots formed therein, and a plurality of coils arranged in a plurality of slots along the radial direction of the stator core are arranged in each of the plurality of slots. , an insulator surrounding one or more of the coils, the insulator being fixed to at least one of the coils disposed on the inner peripheral side of the stator core of the slot. At least two layers overlap in the radial direction of the child core, and one layer overlaps in the circumferential direction of the stator core, the insulators are two molded resin bobbins, and the coils arranged on the outer circumferential side are A coil surrounded by the two resin bobbins that can be divided in the radial direction and arranged on the inner peripheral side is surrounded by the two resin bobbins that can be divided in the circumferential direction and surrounds the coil that is arranged on the outer peripheral side. The two resin bobbins have surfaces that overlap with each other in the circumferential direction, and the insulating paper on the inner peripheral side has surfaces that overlap with each other in the radial direction.

According to the present invention, it is possible to realize a stator for use in a rotating electric machine having an insulator structure that can prevent damage even if the stator coil is bent outside the slot.

1 is a schematic cross-sectional view of a rotating electric machine to which Example 1 of the present invention is applied. FIG. 3 is a schematic perspective view of a stator core. It is a figure explaining the formation method of the segment coil in a stator core. It is a figure explaining the formation method of the segment coil in a stator core. FIG. 3 is a diagram illustrating a method of connecting segment coils, showing only a coil for one phase of a three-phase motor. FIG. 3 is a diagram showing the arrangement of a coil and an insulator inside a slot in Example 1 of the present invention. It is a figure which shows the structure different from this invention. 1 is a diagram showing the configuration of Example 1 of the present invention. FIG. 3 is a diagram for explaining the effects of Example 1. 7 is a diagram showing a modification of Example 1. FIG. 7 is a diagram showing another modification of the first embodiment. FIG. 7 is a diagram illustrating still another modification of the first embodiment. FIG. FIG. 2 is a schematic configuration diagram of Example 2. FIG. 3 is a schematic explanatory diagram of Example 3. FIG. 4 is a schematic explanatory diagram of Example 4. FIG. 4 is a schematic explanatory diagram of Example 4.

Examples for carrying out the present invention (hereinafter referred to as "embodiments") will be described below with reference to the drawings. In addition, in all the drawings for explaining the embodiments, the same members are designated by the same reference numerals in principle, and overlapping explanations will be omitted as appropriate. Note that the present invention is not limited to the examples described below.

Before describing the embodiments, the background to the present invention will be described.

In stator manufacturing, the two legs of a segment coil formed into a U-shape are wrapped in insulating paper and inserted into the slots of the stator core, and the coil is passed through to the opposite side of the core. Bend the straight part of the tip of the leg in the circumferential direction and weld the coil.

If the insulating paper is bent together with the coil when the coil is bent, the insulating paper may be torn, resulting in a product defect. In particular, insulating paper tears almost always occur on the inner circumferential side. Due to defects during manufacturing, the percentage of insulating paper being torn was extremely high.

This embodiment has been made in view of the above problems.

(Example 1)
Example 1 of the present invention will be described using FIGS. 1 to 4.

FIG. 1 is a schematic cross-sectional view of a rotating electrical machine 1 to which a first embodiment is applied.

In FIG. 1, a rotating electrical machine 1 includes a stator 20 and a rotor 30. The stator 20 is housed in a housing 12, and end brackets 11 are provided at both ends of the housing 12, supporting the shaft 70 via bearings 71. A rotor 30 is attached to the shaft 70, and the rotor 30 includes a rotor core 300 and magnets 4. A segment coil (formed coil) 6 surrounded by an insulating paper 5 is attached to the stator core 200 .

FIG. 2 is a schematic perspective view of stator core 200.

As shown in FIG. 2, a cylindrical stator core 200 has slots 21 formed therein for inserting coils. To define the 200 magnetic paths of the stator core 200, the teeth portion 22, which is the radial magnetic path, and the circumferential magnetic path of the stator core 200 are referred to as a core back 23.

3 and 4 are diagrams illustrating a method of forming segment coils 6 in stator core 200.

As shown in FIG. 3, the segment coils 6 are wrapped in an insulator (insulating paper) 5 and inserted into the slots 21 so as to be lined up in the radial direction.

The upper side of the segment coil 6 in the paper is called the mountain side, and the lower side is called the connection side. The insulator 5 is slightly longer than the stator core 200 in the axial direction (vertical direction in FIG. 3), and is configured to protrude from the slot 21.

After inserting the segment coils 6 into all the slots 21 of the stator core 200, the segment coils 6 are bent in the circumferential direction of the stator core 200 all at once, as shown in FIG. At this time, the problem to be solved by the present invention is to suppress damage to the insulating paper 5 in the lower part of FIG.

FIG. 5 is a diagram showing a method of connecting the segment coils 6, and is a diagram showing only a coil for one phase of a three-phase motor. In FIG. 5, slot numbers 1 to 12 are shown.

In FIG. 5, the thick solid line indicates the mountain side of the segment coil 6 on the front side of the page, and the double line indicates the connection side on the other side of the page. open. Then, the bent portion of the segment coil 6 is connected to the adjacent segment coil 6 at the welding point 7.

For example, in the series circuit (1), the segment coil 6A is inserted into the stator core 200 from the front in the drawing, spanning the second layer of the first slot 21 and the first layer of the fourth slot 21. Furthermore, the segment coil 6B is also inserted into the second layer of slot No. 7 21 and the first layer of slot No. 10, and the bending portion of the segment coil 6B on the connection side on the left side of the page is connected to the bending portion of the segment coil 6A on the right side of the page. Connect at weld point 7. By repeating this and going around the stator core 200 once, the stator coil (segment coil) 6 is formed into a winding by so-called wave winding.

Similarly, windings of the series circuits (2) to (4) are formed by segment coils 6C, 6D, 6E, 6F, 6G, and 6H, resulting in four turns of coils. The stator winding is completed by creating three phases of them.

In this way, the segment coil 6 goes around once in the first and second layers, and goes around once in the next three and four layers, so the number of conductors (number of coils) arranged in the slot 21 becomes an even number.

FIG. 6 is a diagram showing the arrangement of the coil 6 (61, 62, 63, 64) and the insulator 5 (insulating paper 51B, 51S) inside the slot 21 in the first embodiment of the present invention.

In FIG. 6, the slot 21 has sheet-like insulators 51S (approximately S-shaped insulating paper) and 51B that surround each of the coils 61 to 64 along the inner wall of the slot 21. Thus, an even number of coils 61, 62, 63, and 64 are arranged in a line in the radial direction of stator core 200. The feature of the first embodiment of the present invention is that two types of insulators 5, namely insulators 51S and 51B, are used. The insulators 51S and 51B are each made by folding insulating paper.

The insulating paper 51B is a sheet of insulating paper, and starts from the upper end of the left side of the coil 64 (the outer periphery of the stator core 200) (starting end), rotates around the coil 64 in a counterclockwise direction, and surrounds the coil 64. It goes downward from the top of the left side (inner circumferential direction of the stator core 200), turns counterclockwise from near the bottom of the left side of the coil 63, surrounds the coil 63, and ends at the bottom end of the left side of the coil 63. (terminal part). As a result, the insulating paper 51B has a substantially B-shaped configuration surrounding each of the coils 64 and 63, and ends at the left side of the coil 63.

In this case, one of the technical features of the insulating paper 51B is that the overlapping portion 9C of the insulating paper 51B is doubled in the circumferential direction of the stator core 200.

If the insulating paper is simply B-shaped without this overlapping portion 9C, it will start from the lower left corner of the coil 64 and end at the upper left corner of the coil 63, and no overlap will occur.

In this case, the insulation distance between the coils 64 and 63 is only the spatial distance between the coils, and it cannot be used with a high-voltage motor. However, with the structure of the insulating paper 51B, the insulation distance is from the upper left corner of the coil 64 to the lower left corner of the coil 63. Creepage distance can be secured.

By ensuring an insulation creepage distance using a structure such as the insulating paper 51B, an insulation structure compatible with a high voltage motor can be achieved.

On the other hand, the insulating paper 51S is also a sheet of insulating paper, starting from the lower left corner (lower left end side) of the coil 62 (starting end), surrounding the coil 62 in a counterclockwise direction, and starting from the lower left end of the coil 62. It goes to the right (circumferential direction of the stator core 200), turns clockwise from near the upper end of the right side of the coil 61, surrounds the coil 61, and ends at the right end of the upper side of the coil 61 (terminal end). As a result, the insulating paper 51S has a substantially S-shaped structure surrounding each of the coils 62 and 61, and ends at the right end of the upper side of the coil 61.

In other words, the starting end of the insulating paper 51S on the inner circumferential side of the slot 21 starts between the two coils 61 and 62 and winds (surrounds) the two coils 61 and 62 in a substantially S-shape. and 62, and between the two coils 61 and 62, three layers of insulating paper are formed.

The starting end of the insulating paper 51B on the outer circumferential side starts from the side of the two coils 63 or 64, and after winding one coil 63 or 64, winding the other coil 63 or 64 in a substantially B shape, the starting end The end portion is formed on the same side as the side of the coil 63 or 64 where the coil 63 or 64 is located, and two sheets are formed so as to overlap.

The overlapping portion 9R of the insulating paper 51S is tripled in the radial direction of the stator core 200. In the case of a simple S-shaped insulating paper without this overlapping portion 9R, it starts from the right corner of the lower side of the coil 62, surrounds the coil 62, and ends at the left corner of the upper side of the coil 61.
In this case, the insulation distance between the coils 62 and 61 is only the distance between the coils 61 and 62 and the teeth, which is not compatible with a high voltage motor.

However, if the structure has an overlapping portion 9R like the insulating paper 51S, the insulation creepage distance of the coil 62 can be ensured from the lower left corner of the coil 62 to the teeth 22. By ensuring the insulation distance in this way, it is possible to provide an insulation configuration compatible with high voltage motors.

Next, the effects of the first embodiment of the present invention will be explained using FIGS. 7 and 8.

FIG. 7 is a diagram showing a configuration different from the present invention, and FIG. 8 is a diagram showing the configuration of Example 1 of the present invention.

The difference between the structure of the insulating paper shown in FIG. 7 and the insulating paper 51S shown in FIG. 8 is the shape of the insulating paper on the inner peripheral side of the stator core 200.

The substantially S-shaped insulating paper 51S shown in FIG. 8 is more difficult to tear than the substantially B-shaped insulating paper 51B shown in FIG.

The coils 61 and 62 and 63 and 64 inserted into the slot 21 are bent alternately in opposite directions on the connection side of the segment coils, as described with reference to FIG. The bending of the coil creates a force that causes the insulating paper to open, causing it to tear.

In particular, since the coils 61 and 62 are located on the inner circumferential side of the stator core 200, the force that bends the stator core 200 in the radial direction is stronger than that of the coils 63 and 64 on the outer circumferential side, and the insulating paper tries to open. The force is greater. Therefore, in the shape 51B shown in FIG. 7 in which the shape of the insulating paper is the same between the outer circumferential side and the inner circumferential side, the insulating paper on the inner circumferential side is likely to be torn, especially at the lower right corner of the coil 61.

On the other hand, according to the first embodiment of the present invention, as shown in FIG. 8, the inner circumferential side has a substantially S-shape, so that the insulating paper 51S cannot be opened when the coil is bent. , the force in the direction of tearing the insulating paper 51S is relaxed. Therefore, the insulating paper 51S becomes difficult to tear and the defective rate is reduced. That is, two coils in the slot 21 are surrounded by one sheet of insulating paper, and the end of the insulating paper 51S surrounding the innermost coil of the two coils in the slot 21 is The direction in which the innermost coil located between the two coils is bent is opposite to the end of the insulating paper 51S in the circumferential direction.

Here, if you only want to prevent the insulating paper from tearing, the insulating paper on the outer periphery can be made into an approximately S-shape similar to 51S, but the approximately S-shaped insulating paper is different from the approximately B-shaped insulating paper. There is a problem that the performance of the motor deteriorates. The effect of the first embodiment of the present invention in this respect will be explained with reference to FIG. FIG. 9 is a diagram for explaining the effects of the first embodiment.

It is well known that the number of turns of the coil increases as the voltage of the motor increases. As the number of coils in the slot increases, the number of layers of insulating paper between the coils also increases, which goes against the demand for miniaturization of motors, which requires high-density mounting of coils.

Increasing the space factor, which is the ratio of the total cross-sectional area of the coil in the slot to the area of the slot, is essential for automobile motors that require miniaturization.In order to increase this space factor, the shape of the coil must be changed. It's square. At this time, the approximately S-shaped insulating paper 51S requires three layers of paper thickness between the two coils that the insulating paper 51S wraps.

The encircled number 3 in FIG. 9(a) means the three layers described above.

On the other hand, the substantially B-shaped insulating paper 51B only needs to have two layers of paper thickness between the two coils that the insulating paper 51B wraps. The part indicating the thickness of the two layers is indicated by a circle 2.

For this reason, when the number of coils increases, and when wrapping the same coil, if the approximately S-shaped insulating paper is increased, the total number of layers in the radial direction of the insulating paper will differ.

FIG. 9(a) shows Embodiment 1 of the present invention, and FIG. 9(b) shows an example in which substantially S-shaped insulating paper 51S is used.

Compared to the example shown in FIG. 9(b), the first embodiment of the present invention shown in FIG. 9(a) can reduce the height of the slot. Although (a) and (b) of FIG. 9 are examples in which the number of coils is six, the same applies to the case where the number of coils is eight.

An example in which the number of coils is 8 is compared in FIGS. 9(c) and 9(d).

If the outer diameter of the motor is the same, the height h1 of the core back portion 23, which is the circumferential magnetic path of the stator core 200, can be made larger than h2 in the example of FIG. 9(b). This is because if the magnetic path is not thick enough, the magnetic saturation of the iron will increase the magnetic resistance and weaken the electromagnetic force of the motor.

Therefore, (a) and (c) of FIG. 9, which are examples of the present invention, show better motor performance, specifically torque, than (b) and (d) of FIG. 9, which are examples different from the present invention. becomes larger. Alternatively, if h2 in FIG. 9(b) is made the same as h1, the diameter of the motor becomes large, which makes it impossible to meet the demand for miniaturization.

As described above, as in the first embodiment of the present invention, only the easily torn insulating paper located on the inner circumferential side of the stator core 200 is made into a substantially S-shape, and the insulating paper on the outside thereof is shaped into a substantially B-shape. By forming the motor into a letter shape, it is possible to create a motor that can handle higher voltages, has less tearing of the insulating paper, and has good performance.

In other words, according to the first embodiment of the present invention, a stator for use in a rotating electric machine having an insulator structure that can suppress the occurrence of damage even if the stator coil is bent outside the slot is realized. be able to.

Further, it is possible to realize a rotating electric machine including a stator having a coil having the above-mentioned insulator structure.

The example shown above is an example in which two types of insulating paper are formed into approximately B-shape and approximately S-shape, respectively, and two coils are wrapped with insulating paper independently one by one. The invention can also be implemented with other insulating paper shapes. For example, if the two coils are in phase, and the voltage can be ensured only by the enamelled wire of the coil, then the two coils should be wrapped around the same circuit as in the modification of Embodiment 1 shown in Figure 10. Just wrap the paper around it. At this time, the insulating paper wrapping around the two innermost coils is made to overlap in two layers in the radial direction, and the insulating paper on the outer circumference side is made to overlap in two layers in the circumferential direction. The reason why this can prevent the insulating paper from tearing is the same as the above example.

In addition, as in the other modification of the first embodiment shown in FIG. 11, although it is approximately B-shaped, only the insulating paper of one of the innermost coils is easily torn, so the insulating paper 51BV of that one coil is (Deformed B-shaped insulating paper) can also be configured so that only two layers do not overlap in the circumferential direction. In other words, in the example shown in FIG. 11, the insulating paper 51BV on the inner circumferential side of the slot 21 wraps two coils with one sheet of insulating paper, and starts from between the two coils and wraps the inner coil in a single layer. After that, the coil on the outer circumferential side is wound around once, and further wound on the outer circumferential side, so that two sheets of insulating paper are overlapped in the radial direction.

Furthermore, as in yet another modification of the first embodiment shown in FIG. The surface where the two sheets overlap is the innermost peripheral side of the slot 21. In other words, for only the innermost coil, the insulating paper 51Q (two sheets of insulating paper (second insulating paper) overlapping in the radial direction) overlap in the radial direction, and for the other coils, the insulating paper 51D (the second insulating paper) overlaps in the radial direction. It is also possible to use two sheets of overlapping insulating paper (first insulating paper).

Further, in the example of FIG. 12, if the innermost insulating papers 51Q are overlapped in the radial direction on the inner circumferential side, the insulating papers can be easily opened against twisting, and tearing can be prevented.

(Example 2)
Next, Example 2 of the present invention will be described.

FIG. 13 is a schematic configuration diagram of the second embodiment. In FIG. 13, the overlapping portion 9C of the approximately B-shaped insulating paper 51B has two layers in the circumferential direction of the stator core 200, and the width of the slot (in the circumferential direction) is accordingly wider than that of the approximately S-shaped insulating paper 51S. is necessary. As a result, if the width of the slot 21 is constant, the width of the teeth 22 will become narrower if even a portion of the substantially B-shaped insulating paper 51B is used.

However, since the motor is circular, W2 is smaller between the teeth width W1 on the outer circumferential side and the teeth width W2 on the inner circumferential side, and W2 becomes a bottleneck for the magnetic path.

Therefore, in the second embodiment, the teeth width is made thicker in the innermost portion of the substantially S-shaped insulating paper 51S. In other words, the slot width (circumferential width) on the inner circumferential side in which the coil surrounded by two sheets (two layers) of insulating paper that overlaps in the radial direction is placed is It is narrower (smaller) than the slot width (circumferential width) on the outer peripheral side where the coil is placed. Thereby, the teeth width W2 at the narrowest portion can be widened, and there is no need to create a neck in the magnetic path.

In other words, according to the second embodiment, in addition to being able to obtain the same effects as in the first embodiment, the inner circumferential side of the teeth is widened in accordance with the thickness of the insulating paper by focusing on the overlapping direction of the insulating paper. Therefore, the torque of the motor can be improved.

(Example 3)
Next, Example 3 of the present invention will be described.

FIG. 14 is a schematic explanatory diagram of the third embodiment.

The concept of the third embodiment is the same as that of the second embodiment, and is an example in which the direction in which the insulating paper overlaps is focused and the cross-sectional shape of the coil is changed accordingly.

In FIG. 14, the coils 61 and 62 have different cross-sectional shapes, and the inner coil 62 of the stator core 200 has a larger circumferential dimension than the outer coil 61 by the width of the insulating paper. It is wide. It is desirable that the cross-sectional area of the coil 61 and the cross-sectional area of the coil 62 be approximately the same. The effect of this is that the AC loss of the coil 62 is reduced. AC loss due to the proximity effect is well known in large rotating machines, and it is known that the loss is proportional to the fourth power of the radial height of the wire coil and the square of the frequency.

As the frequency increases with high speed rotation, this loss becomes dominant.

In the third embodiment as well, the same effects as those in the first embodiment can be obtained, and also the effects of reducing AC loss and improving efficiency can be obtained.

(Example 4)
Next, Example 4 will be explained.

15 and 16 are schematic explanatory diagrams of the fourth embodiment. In this fourth embodiment, the insulator is not paper but molded resin, and this is an example in which two molded resins of the same shape are combined to insulate two coils at a time.

It is common to use molded resin bobbins to insulate coils, but if the resin is made too thin, cracks will occur, resulting in product defects similar to insulating paper. In order to prevent this, when bending the coil, the resin bobbin on the inner circumference side is made to separate in the circumferential direction, and the resin bobbin on the outer circumference side is made to separate in the radial direction so that the resin bobbin spreads out.

In the example shown in FIG. 15, there are two C-shaped insulating bobbins 52C on the inner circumferential side of the stator core 200, and two U-shaped insulating bobbins 52U on the outer circumferential side, and the two coils are insulated by the two bobbins. . The two inner C-shaped insulating bobbins 52C surround the two coils with their opening sides facing each other in the circumferential direction of the stator core 200, and have surfaces that overlap in the radial direction. Moreover, the two U-shaped insulating bobbins 52U on the outer peripheral side surround the two coils with their opening sides facing each other in the radial direction of the stator core 200, and have surfaces that overlap in two layers in the circumferential direction.

In the example shown in FIG. 15, each two coils are in phase, and the distance between the two coils, which are insulated by a pair of bobbins, is secured only by the enamel coated on the coils.

FIG. 16 is a diagram showing the shape of a bobbin when insulation is required for each coil. In FIG. 16, the bobbin 52A is an A-shaped insulating bobbin, one A-shaped insulating bobbin bobbin 52A is A-shaped, and the other bobbin 52A is an inverted A-shaped insulating bobbin with A upside down, and two bobbins 52A. combine with each other to insulate each of the two coils and ensure insulation between the coils. In the example shown in FIG. 16, the two E-shaped insulating bobbins 52E on the inner peripheral side have surfaces that overlap each other in the radial direction. Further, the two A-shaped insulating bobbins 52A on the outer peripheral side have surfaces that overlap with each other in the circumferential direction.

Further, the bobbin 52E is an E-shaped insulated bobbin, one bobbin 52E is E-shaped, and the other bobbin 52E has a shape in which E is reversed left and right. The two bobbins 52E are combined with each other, and the two coils are Insulate each and ensure insulation between coils.

What is characteristic is the E-shaped insulating bobbin 52E, and there is no portion where the bobbins 52E overlap each other in the circumferential direction. This prevents the two bobbins 52E from moving in the direction of separation and breaking when bending the coil.

The example shown in FIG. 15 is for low pressure, and the example shown in FIG. 16 is for high pressure.

In the fourth embodiment, the same effects as in the first embodiment can be obtained.

As described above, according to the present invention, it is possible to realize a stator used in a rotating electric machine having an insulator structure that can suppress the occurrence of damage even if the stator coil is bent outside the slot. I can do it.

Further, it is possible to realize a rotating electric machine including a stator having a coil having the above-mentioned insulator structure.

It should be noted that in the configurations shown in FIGS. 10, 11, 12 and 15 and 16, the width of the slot shown in Example 2 and Example 3 and the cross-sectional shape of the coil can be changed. Not even.

Moreover, although the above-mentioned example is an example in which the segment coil is a rectangular wire, the present invention is applicable even if the segment coil is a round wire.

Further, although the above-mentioned example is an example in which four or more coils are arranged in the radial direction of the stator core 200, the present invention also applies to an example in which two coils are arranged in the radial direction of the stator core 200. Applicable.

1... Rotating electric machine, 4... Permanent magnet, 5... Insulator (insulating paper), 6, 6A to 6H... Segment coil (formed coil), 7... Welding point, 9C, 9R ...Insulating weight bearing part, 11...End bracket, 12...Housing,
20... Stator, 21... Slot, 22... Teeth, 23... Core back, 30... Rotor, 51B... Approximately B-shaped insulating paper, 51D... Circumferential direction 2-ply insulating paper, 51BV... modified B-shaped insulating paper, 51Q... radial 2-ply insulating paper, 51S... approximately S-shaped insulating paper, 52A... A-shaped insulating bobbin, 52C ...C-shaped insulated bobbin, 52E...E-shaped insulated bobbin, 52U...U-shaped insulated bobbin, 61-64...coil, 70...shaft, 71...bearing, 200... Stator core, 300...rotor core

Claims (10)

a stator core in which a plurality of slots are formed;
a plurality of coils arranged in each of the plurality of slots along the radial direction of the stator core;
an insulator surrounding one or more of the coils;
Equipped with
The insulator is
At least two layers overlap in the radial direction of the stator core with respect to at least one coil disposed on the inner peripheral side of the stator core in the slot, and one layer overlaps in the circumferential direction of the stator core. and
The insulator is an insulating paper made by folding,
The starting end of the insulating paper on the inner peripheral side of the slot starts between the two coils, surrounds the two coils in a substantially S-shape, ends between the two coils, and extends between the two coils. Formed into three layers of insulating paper,
The starting end of the insulating paper on the outer circumferential side of the slot starts from the side of the two coils, and after winding one coil, winding the other coil in a substantially B-shape, A stator for use in a rotating electric machine, characterized in that the end portion is formed on the same side surface of the coil, and the stator is formed in two overlapping pieces . a stator core in which a plurality of slots are formed;
a plurality of coils arranged in each of the plurality of slots along the radial direction of the stator core;
an insulator surrounding one or more of the coils;
Equipped with
The insulator is
At least two layers overlap in the radial direction of the stator core with respect to at least one coil disposed on the inner peripheral side of the stator core in the slot, and one layer overlaps in the circumferential direction of the stator core. and
The insulator is an insulating paper made by folding,
The coils in the slot are surrounded one by one or two by two with insulating paper, and the insulating paper includes two first insulating papers that overlap in the circumferential direction and a second insulating paper that overlaps in the radial direction. 1. A stator for use in a rotating electric machine , comprising a sheet of paper, wherein two sheets of insulating paper at the innermost periphery of the slot overlap in the radial direction . In the stator used in the rotating electric machine according to claim 2 ,
A stator for use in a rotating electrical machine, characterized in that the surfaces of two insulating papers of the innermost coil that overlap in the radial direction are the innermost circumferential side of the slot. In the stator used in the rotating electric machine according to claim 2 ,
The coils in the slot are surrounded by insulating paper two by two, and the end of the insulating paper surrounding the innermost coil of the two coils in the slot is between the two coils. A stator for use in a rotating electric machine, wherein the coil located at the innermost circumference is bent in a direction opposite to an end of the insulating paper in the circumferential direction. a stator core in which a plurality of slots are formed;
a plurality of coils arranged in each of the plurality of slots along the radial direction of the stator core;
an insulator surrounding one or more of the coils;
Equipped with
The insulator is
At least two layers overlap in the radial direction of the stator core with respect to at least one coil disposed on the inner peripheral side of the stator core in the slot, and one layer overlaps in the circumferential direction of the stator core. and
The insulator is an insulating paper made by folding,
The insulating paper on the inner circumferential side of the slot wraps two coils with a sheet of insulating paper, starts between the two coils, wraps the inner coil once, and then wraps the outer coil once. A stator for use in a rotating electric machine, further comprising two sheets of insulating paper wrapped around the outer diameter and overlapping in the radial direction. A stator for use in a rotating electric machine according to claim 1,
The cross-sectional shape of the coil disposed on the inner circumferential side of the slot is characterized in that the circumferential dimension of the stator core is larger than the cross-sectional shape of the coil disposed on the outer circumferential side of the slot. Stator used in rotating electric machines. A stator for use in a rotating electric machine according to claim 1,
The circumferential width of the inner slot in which the coil surrounded by two layers of insulating paper in the radial direction is arranged is smaller than the circumferential width of the slot of the coil arranged in the outer circumference of the stator core . A stator used in a rotating electric machine characterized by: a stator core in which a plurality of slots are formed;
a plurality of coils arranged in each of the plurality of slots along the radial direction of the stator core;
an insulator surrounding one or more of the coils;
Equipped with
The insulator is
At least two layers overlap in the radial direction of the stator core with respect to at least one coil disposed on the inner peripheral side of the stator core in the slot, and one layer overlaps in the circumferential direction of the stator core. and
the insulators are two molded resin bobbins;
The coil arranged on the outer circumferential side is surrounded by the two resin bobbins that can be divided in the radial direction, and the coil arranged on the inner circumferential side is surrounded by the two resin bobbins that can be divided in the circumferential direction. The two resin bobbins surrounding the coil arranged on the outer circumferential side have surfaces that overlap with each other in the circumferential direction, and the insulating paper on the inner circumferential side has surfaces that overlap with each other in the radial direction. Stator used for. A stator for use in a rotating electric machine according to claim 6 ,
A stator for use in a rotating electrical machine, wherein a cross-sectional area of the coil disposed on the inner circumferential side and a cross-sectional area of the coil disposed on the outer circumferential side are substantially the same. A rotating electric machine comprising the stator according to claim 1 and a rotor .

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