TW202201876A - Axial-gap type rotating electric motor characterized by improving the productivity of the stator and suppressing the disconnection of the electric connection of the iron core and the housing caused by the deterioration with time - Google Patents

Abstract

An object of the invention is to provide an axial-gap type rotating electric motor that can improve the productivity of the stator and suppress the disconnection of the electric connection of the iron core and the housing caused by the deterioration with time. The axial-gap-type rotating electric motor is equipped with: a plurality of stator cores 21 each having a coil 24 wound around an iron core 22; a stator 2 formed by the stator cores 21 arranged in an annular form; a rotor 3 facing the stator 2 across an air gap; a housing 5 covering the stator 2; a molded resin 9 that seals the side surface of the iron core 22 and has an opposing surface 91 opposite to the rotor 3; an annular first conductor 11 disposed on the opposing surface 91 in a manner of enclosing the periphery of the iron core 22, provided with a notch portion 13 at one part of the periphery of the iron core 22, and electrically connected to the housing 5; and a second conductor 12 disposed on the opposing surface, and located on the at least one side of the outer diameter side and the inner diameter side of the stator 2 of the iron core 22, so as to electrically connected to the first conductor 11 and the iron core 22.

Description

Axial Gap Type Rotary Electric Machine

The present invention relates to an axial gap type rotating electrical machine.

In the direction of the rotation axis, the electrostatic capacitance between the coil and the rotor of the axial gap type rotating electrical machine in which the stator and the rotor are opposed to each other with a specific air gap is likely to increase, and the shaft voltage is likely to be generated. In particular, in the stator whose stator core is sealed by the molded resin, since the stator core is electrically insulated by the molded resin, the potential of the stator becomes a floating potential, the electrostatic capacitance between the coil and the rotor is further increased, and the shaft voltage is further increased. . If the shaft voltage exceeds the dielectric breakdown voltage of the oil film of the bearing, electrical corrosion will occur in the bearing and the life of the bearing will be shortened. Patent Document 1 discloses a technique for reducing the shaft voltage. [Prior Technology Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 6208331

[Problems to be Solved by Invention]

The axial gap type rotating electrical machine disclosed in Patent Document 1 uses a plate-like conductor to electrically connect the side surface of the iron core on the outer diameter side of the stator with the casing, set the iron core to the ground potential, reduce the shaft voltage, and A strip conductor is arranged on the opposite surface of the flange portion of the bobbin and the rotor to shield the gap between the coil and the rotor, thereby reducing electrostatic capacitance and further reducing the shaft voltage. However, the plate-shaped conductors and the strip-shaped conductors must be preliminarily processed into a shape matching the installation site.

In this regard, the inventors believe that productivity can be improved by electrically connecting the iron core and the casing and shielding the coil and the rotor by using a substitute member that does not require a step of pre-processing into a shape matching the installation site. Furthermore, the inventors found out that there is a possibility that a gap may be formed between the iron core and the molding resin or between the iron core and the bobbin due to deterioration over time. In the case of connection, attention must be paid to this point.

An object of the present invention is to provide an axial gap type rotating electrical machine which can improve the productivity of the stator and suppress the electrical connection between the iron core and the casing from being broken due to deterioration over time. [Technical means to solve problems]

In order to achieve the above object, the present invention includes: a plurality of stator cores, the coils being wound around the iron cores; a stator formed by the plurality of stator cores arranged annularly; a rotor and the stator separated by an air gap Opposite; a casing covering the stator; a molded resin sealing the side surface of the iron core and having an opposing surface facing the rotor; a first conductor in a ring shape to surround the iron core The way around the core is arranged on the opposite surface, a part of the circumference of the iron core is provided with a notch, and is electrically connected to the outer shell; and a second conductor is located on the opposite surface of the iron core. At least one of the inner diameter side and the outer diameter side of the stator is provided to electrically connect the first conductor and the iron core. [Effect of invention]

According to the axial gap type rotating electrical machine of the present invention, the productivity of the stator can be improved, and the generation of electric corrosion due to the deterioration over time can be suppressed, and the reduction of the service life can be suppressed. The problems, configurations, and effects other than those described above will be clarified by the description of the following embodiments.

Hereinafter, the configuration and operation of the axial gap type rotating electrical machines according to the first to fifth embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, the same code|symbol shows the same part.

FIG. 1 is a cross-sectional perspective view of an axial gap type rotating electrical machine of a comparative example. As shown in FIG. 1 , the axial gap type rotating electrical machine 100 of the comparative example is a dual-rotor type in which two rotors are sandwiched by a stator.

The axial gap type rotating electrical machine 100 includes a stator 2 , two rotors 3 , a shaft 4 , a casing 5 , two bearings 6 , a front casing 7 , and a rear casing 8 .

The stator 2 is an armature formed by arranging a plurality of stator cores 21 annularly. The stator core 21 includes an iron core 22 , a bobbin 23 , and a coil 24 . The iron core 22 is an iron block formed by laminating a soft magnetic sheet such as an electromagnetic steel sheet punched into a specific shape in the radial direction of the stator 2 . In addition, it is preferable to use an amorphous metal for the soft magnetic thin plate in order to reduce iron loss. The bobbin 23 is a cylindrical resin. The iron core 22 is inserted into the bobbin 23 . The coil 24 is an electric wire for generating a magnetic field, and is wound around the bobbin 23 .

The rotor 3 includes a plurality of magnets 31 , a back yoke 32 , and a base 33 . The plurality of magnets 31 are annularly fixed to the surface of the base 33 on the side of the stator 2 with the back yoke 32 interposed therebetween, and face the stator 2 with an air gap therebetween. The back yoke 32 is a winding iron core wound with a strip-shaped electromagnetic steel plate, and is fixed to an annular groove 33 a provided on the surface of the stator 2 side of the base 33 . The base 33 is a disk-shaped non-magnetic body having an annular groove 33a and a through hole 33b. The through-hole 33b is provided in the center of the base 33, and the shaft 4 is inserted.

The shaft 4 is a rotating shaft and is supported by two bearings 6 . Moreover, each of the two bearings 6 is fixed to the front case 7 and the rear case 8 .

The casing 5 is a part covering the stator 2 . With the casing 5, the front casing 7 and the rear casing 8 are installed. The front casing 7 and the rear casing 8 are disc-shaped parts, which are installed on both ends of the casing 5 and cover the opening of the casing 5 .

2 is an axial cross-sectional view of a casing and a stator of an axial gap type rotating electrical machine of a comparative example. In the housing 5 , the disk-shaped guide portion 52 protrudes in the inner diameter direction from the inner peripheral surface of the cylindrical portion 51 covering the stator 2 . The stator 2 is positioned at a specific position in the housing 5 by the guide portion 52 .

Also, the stator 2 positioned at a specific location in the casing 5 is molded by the molding resin 9 . The molding resin 9 is a molding material for molding the stator 2 in the casing 5 so that the opposing surface 521 of the guide portion 52 facing the rotor 3 is exposed, and has a through hole, that is, an axial hole 25 in the center. The conductor 10 is provided on the facing surface 91 on the side where the facing surface 521 of the guide portion 52 of the facing surface 91 of the molded resin 9 facing the rotor 3 is exposed. The conductor 10 is in contact with the iron core 22 and the guide portion 52 .

3 is a perspective view of a stator, a rotor, and a casing of an axial gap type rotating electrical machine of a comparative example. In addition, in order to clarify the arrangement|positioning of the stator core 21 and the shape of the molding resin 9, the cylindrical part front side of the housing 5, the conductor 10, and the guide part 52 are abbreviate|omitted and shown. As shown in FIG. 3 , the mold resin 9 molds the stator 2 in which a plurality of stator cores 21 are annularly arranged, and is fixed to the casing 5 .

4 is a schematic view of the stator 2 and the housing 5 of the axial gap type rotating electrical machine 100 of the comparative example viewed from the axial direction of the side where the conductor 10 is provided.

As described above, the through hole 25 is provided in the center of the molded resin 9 , and the conductor 10 provided on the opposing surface 91 facing the rotor 3 is in contact with the iron core 22 and the guide portion 52 . Therefore, the conductor 10 electrically connects the casing 5 and the iron core 22 . Therefore, the iron core 22 is grounded through the case 5 via the conductor 10, the electric potential of the iron core 22 is prevented from becoming a floating potential, and the generation of the shaft voltage is suppressed.

For the conductor 10, a liquid conductive member, such as a conductive paint or a conductive adhesive (hereinafter referred to as a conductive paint or the like) that is cured after installation (coating) is used. Therefore, the step of pre-processing the conductor 10 into a shape matching the installation site can be eliminated, and the productivity can be improved.

For the base material such as conductive paint, for example, epoxy resin, acrylic resin, urethane resin, polyester resin, polysiloxane resin can be used alone or in combination. In addition, for conductive particles such as conductive paints, materials having conductivity such as silver, copper, gold, nickel, aluminum, and carbon are used, and those with lower resistance values (that is, those with higher conductivity) are preferably used. substance), such as silver or copper. Moreover, the paste-like electroconductive particle which solidified after heating and melting can be used for the conductor 10 .

In addition, the conductor 10 is preferably a non-magnetic material. The non-magnetic conductor 10 shields (shields) the electrostatic bonding caused by the common mode voltage induced from the coil 24 to the rotor 3 . Thereby, the voltage applied to the bearing 6 is reduced, and the galvanic corrosion of the bearing 6 is suppressed. Therefore, the non-magnetic conductor 10 is preferably disposed on the entire surface of the opposing surface of the stator 2 that faces the rotor 3 .

On the other hand, the axial gap type rotating electrical machine 100 of the comparative example has the following problems. That is, the plurality of annular portions 101 surrounding each of the plurality of iron cores 22 are formed by the conductor 10 applied to the opposite surface 91 of the molding resin 9 facing the rotor 3 . Therefore, a current flows along each of the plurality of annular portions 101 , and a plurality of eddy currents are generated in the conductor 10 . In addition, the annular portion 102 surrounding the shaft center hole 25 is formed by the conductor 10 applied to the opposing surface 91 of the molding resin 9 facing the rotor 3 . Therefore, in the conductor 10 , an eddy current is generated along the annular portion 102 . Therefore, the axial gap type rotating electrical machine 100 has a problem of reduction in efficiency due to an increase in eddy current loss.

In addition, if the axial gap type rotating electrical machine 100 is used for a long period of time, the sealing surfaces 92 to 95 for sealing each of the side surfaces of the iron core 22 of the molded resin 9 are deformed and separated from the side surfaces of the iron core 22, and the sealing surfaces The case where gaps are generated between 92 to 95 and the side surfaces of the iron core 22 . When a gap is formed between the sealing surfaces 92 to 95 and each side surface of the iron core 22 , the conductor 10 is cracked, and the electrical connection between the conductor 10 and the iron core 22 is cut off. In this case, the potential of the iron core 22 becomes a floating potential, and an axial voltage is generated. Therefore, if the axial gap type rotating electrical machine 100 of the comparative example is used for a long period of time, there is a problem that electrical corrosion occurs in the bearing 6 and the service life is shortened.

(first embodiment) 5 is a schematic view of the casing 5 and the stator 2 of the axial gap type rotating electrical machine 1 according to the first embodiment of the present invention, viewed from the side of the rotor 3 . The difference between the axial gap type rotating electrical machine 1 of the present embodiment and the axial gap type rotating electrical machine 100 of the comparative example is the configuration, shape and arrangement of the conductors 10 .

The conductor 10 of the axial gap type rotating electrical machine 1 of the present embodiment is composed of a first conductor 11 and a plurality of second conductors 12 (the same number as the iron core 22).

The first conductor 11 is an annular conductor, and is provided on the facing surface 91 of the molding resin 9 sealing the stator core 21 facing the rotor 3 so as to surround the circumference of the iron core 22 . A portion around the core 22 has a notch 13 and is electrically connected to the casing 5 .

Next, the first conductor 11 of the present embodiment will be described in detail with reference to FIG. 5 . The first conductor 11 is a conductive paint or the like applied to the opposing surface 91 of the mold resin 9 facing the rotor 3 , and has an outer diameter portion 111 , a plurality of intermediate portions 112 , an inner diameter portion 113 , and a plurality of a notch portion 13 .

The outer diameter portion 111 is an annular conductive paint or the like applied to the opposing surface 91 of the mold resin 9 that seals the outer side surfaces of the plurality of iron cores 22 disposed annularly and faces the rotor 3 . Between the outer diameter portion 111 and each of the plurality of iron cores 22, a first insulating tape 141 protruding from the opposing surface 91 of the self-molded resin 9 facing the rotor 3 is provided. Therefore, the outer diameter portion 111 is insulated from each of the plurality of iron cores 22 by the first insulating tape 141 . In addition, the end of the outer diameter portion 111 in the outer diameter direction is in contact with the guide portion 52 of the housing 5 . Therefore, the first conductor 11 is electrically connected to the case 5 .

The plurality of intermediate portions 112 are rectangular conductive paints, etc., which are applied to the plurality of the plurality of iron cores 22 facing the rotor 3 of the molding resin 9 that seals the side surfaces of the two adjacent iron cores 22 . on the opposite side 91. Between the two adjacent iron cores 22 and each of the plurality of intermediate portions 112, a second insulating tape 142 and a third insulating tape 142 protruding from the opposite surface 91 of the self-molded resin 9 facing the rotor 3 are respectively provided. Insulating tape 143. Therefore, each of the plurality of intermediate portions 112 is insulated from each of the adjacent two iron cores 22 by the second insulating tape 142 and the third insulating tape 143 .

The inner diameter portion 113 is an annular conductive paint or the like applied to the facing surface 91 of the molding resin 9 that seals the inner side surfaces of the plurality of iron cores 22 arranged in an annular shape, which faces the rotor 3 . Between the inner diameter portion 113 and each of the plurality of iron cores 22, a fourth insulating tape 144 protruding from the opposing surface 91 of the self-molded resin 9 facing the rotor 3 is provided. Therefore, the inner diameter portion 113 is insulated from each of the plurality of iron cores 22 by the fourth insulating tape 144 . In addition, the end in the inner diameter direction of the inner diameter portion 113 is in contact with the annular convex portion 251 which is annularly protruded along the axial hole 25 on the opposite surface 91 of the self-molded resin 9 facing the rotor 3 . Therefore, the inner diameter portion 113 is separated from the shaft center hole 25 by the annular convex portion 251 . Therefore, in the step of coating the inner diameter portion 113 , the conductive paint or the like can be prevented from flowing out to the shaft center hole 25 .

The conductive paint or the like forming each of the outer diameter portion 111 , the plurality of intermediate portions 112 , and the inner diameter portion 113 is connected to each other. Therefore, each of the plurality of iron cores 22 is surrounded by a conductive paint or the like that forms each of the outer diameter portion 111 , the plurality of intermediate portions 112 , and the inner diameter portion 113 . Therefore, an annular portion 114 is formed around each of the plurality of iron cores 22 , such as conductive paint or the like that annularly surrounds each of the plurality of iron cores 22 . Therefore, the first conductor 11 is an aggregate of conductive paint or the like that forms the annular portion 114 surrounding each of the plurality of iron cores 22 arranged annularly.

Furthermore, the annular insulating tape 14 surrounding each of the plurality of iron cores 22 is formed by the first insulating tape 141 to the fourth insulating tape 144 . Therefore, each of the plurality of iron cores 22 and the first conductor 11 are insulated by the insulating tape 14 .

The notch portion 13 is a portion that electrically cuts off the annular portion 114 surrounding the iron core 22 . The annular portion 114 can be electrically cut off by the notch portion 13, and the current flowing along the annular portion 114 can be interrupted to prevent the generation of eddy currents.

Specifically, the cutout portion 13 is an insulator that protrudes from the opposing surface 91 of the molded resin 9 facing the rotor 3 and is connected to the insulating portions inside and outside the annular portion 114 . Since the notch portion 13 is connected to the insulating portions on the inner side and the outer side of the annular portion 114 , the annular portion 114 is electrically cut off. Conversely, when the notch portion 13 is connected to the conductor inside or outside the annular portion 114 , the annular portion 114 is not electrically cut off. For example, if the notch portion 13 is connected to the conductor outside the annular portion 114 , that is, the guide portion 52 of the housing 5 , the current flowing along the annular portion 114 flows through the guide portion 52 connected to the notch portion 13 without being shielded. break.

In addition, the notch portion 13 of the axial gap type rotating electrical machine 1 of the present embodiment is connected to the fourth insulating tape 144 to serve as an insulating portion inside the annular portion 114 , and is connected to the annular convex portion 251 to serve as the outside of the annular portion 114 . the insulation part.

In addition, the cutout portion 13 of the axial gap type rotating electrical machine 1 of the present embodiment is connected to the annular convex portion 251 as described above. Therefore, the inner diameter portion 113 is cut by the cutout portion 13 .

In addition, the axial gap type rotary electric machine 1 of the present embodiment, like the axial gap type rotary electric machine 100 of the comparative example, is used for a long period of time, and there is a seal of the molding resin 9 for sealing each of the side surfaces of the iron core 22 The surfaces 92 to 95 are deformed and separated from the iron core 22 , and a gap is generated between the sealing surfaces 92 to 95 and the iron core 22 .

Based on the axial gap type rotating electrical machine that has been used for a long time, the inventors have found that the gap is generated in the following tendency, that is, the sealing surfaces 92 and 93 for sealing the side surface of the iron core 22 in the circumferential direction of the stator 2 are mostly, and in the circumferential direction of the stator 2 The inner diameter side of the stator 2 has fewer sealing surfaces 93 and 94 sealing the side surface of the iron core 22 with the outer diameter side, and the sealing surface 94 sealing the side surface of the iron core 22 on the inner diameter side of the stator 2 is the least. Therefore, the axial gap type rotating electrical machine of the present invention includes the second electrical conductor 12 , and the second electrical conductor 12 is located in the stator 2 of the iron core 22 on the opposite surface of the molded resin 9 facing the rotor 3 . At least one of the radial side and the outer diameter side is a conductive paint or the like applied so as to electrically connect the first conductor 11 and the iron core 22 .

In particular, in the axial gap type rotating electrical machine 1 of the present embodiment, as shown in FIG. 5 , the second conductor 12 is located on the stator of the iron core 22 on the opposing surface 91 of the molded resin 9 facing the rotor 3 . On the inner diameter side of 2 , the inner diameter portion 222 on the inner diameter side of each of the plurality of iron cores 22 arranged annularly is electrically connected to the inner diameter portion 113 of the first conductor 11 .

In addition, as shown in FIG. 5 , the second conductor 12 may be applied not only to the facing surface 91 of the mold resin 9 facing the rotor 3, but also to each of the plurality of iron cores 22 and the rotor. 3. On the opposite end face 221 and on the inner diameter portion 113 of the first conductor 11.

In addition, the second conductor 12 can be linearly coated on the end face 221 of the iron core 22 in which a plurality of steel plates are laminated in the radial direction of the stator 2, which faces the rotor 3, and the plurality of steel plates can be electrically connected.

In addition, the first conductor 11 and the second conductor 12 may be formed of the same conductive member.

In addition, different conductive members can be used for the first conductor 11 and the second conductor 12. For example, for the first conductor 11, a conductive paint or the like is used, and for the second conductor 12, a conductive material is mixed in the adhesive layer. The adhesive tape of the filler is formed by the conductive tape. The reason is as follows.

The first conductor 11 is provided only on the opposing surface 91 of the mold resin 9 facing the rotor 3, surrounds each of the plurality of iron cores 22, has a notch 13, and has a complex shape combining arcs and rectangles. On the other hand, the second conductor 12 is provided on the facing surface 91 of the mold resin 9 facing the rotor 3 , on the end surface 221 facing the rotor 3 of the iron core 22 , and on the first conductor 11 . The three different parts become simple shapes such as rectangles.

On the one hand, since the conductive paint and the like are in a liquid state that is cured after coating, as described above, there is no need for a step of pre-processing into a shape matching the installation site. Moreover, even a complicated shape can be handled easily. However, since the conductive paint or the like is a liquid, there are cases in which shading or deformation occurs due to the affinity of the material to be applied. Therefore, in the case where the conductive paint or the like is applied to one surface, it is preferably applied to the surface formed of the same material. Moreover, since the conductive paint or the like is cured after application, it is in close contact with the surface to be applied. Therefore, when the coated surface is cracked, the conductive paint or the like is also likely to be cracked. Thereby, it is suitable for the first conductor 11 .

On the other hand, since the conductive tape is solid, it is difficult to easily cope with complicated shapes. However, it is not limited to the material to be coated and attached without producing shading or deformation. Therefore, the conductive tape can be applied to surfaces formed of different materials. In addition, since the conductive tape is adhered to a solid, it does not adhere to the surface to be applied. Therefore, even if the coated surface is cracked, the conductive tape is not easily cracked. Thereby, the second conductor 12 is suitable. [Effect] In the axial gap type rotating electrical machine 1 of the present embodiment, since the first conductor 11 is electrically connected to the casing 5, the first conductor 11 can be grounded through the casing 5 to prevent the potential of the first conductor 11 from becoming a floating potential , while suppressing the generation of shaft voltage.

In addition, each of the plurality of iron cores 22 is electrically connected to the first conductor 11 through each of the plurality of second conductors 12 . Therefore, each of the plurality of iron cores 22 can be grounded through the first conductor 11 and the plurality of second conductors 12 through the case 5, so that the potential of each of the plurality of iron cores 22 can be prevented from becoming a floating potential, and the occurrence of shafts can be suppressed. Voltage.

In particular, the second conductor 12 of the axial gap type rotating electrical machine 1 of the present embodiment is coated on the inner diameter of the stator 2 of the iron core 22 on the facing surface 91 of the mold resin 9 that faces the rotor 3 . side. That is, when the axial gap type rotating electrical machine 1 is used for a long period of time, the second conductive coating is applied to the position where a gap is most likely to be generated between the mold resin 9 sealing the side surface of the iron core 22 and the side surface of the iron core 22. body 12. Therefore, even if the axial gap type rotating electrical machine 1 is used for a long period of time, the second conductor 12 is not easily broken, and the electrical connection between the iron core 22 and the first conductor 11 can be maintained. Therefore, even if the axial gap-type rotating electrical machine 1 of the present embodiment is used for a long period of time, the bearing 6 is not liable to be galvanically corroded, and the reduction of the service life can be suppressed.

In addition, in the axial gap type rotating electrical machine 1 of the present embodiment, the notch portion 13 is provided in each of the plurality of annular portions 114 included in the first conductor 11 . Therefore, the current flowing along each of the plurality of annular portions 114 can be interrupted. Therefore, the eddy current can be suppressed, and the reduction in the efficiency of the axial gap type rotating electrical machine 1 can be suppressed.

Further, each of the plurality of cutout portions 13 is connected to an annular convex portion 251 of a mold resin that forms an opening edge of the through hole 25, and divides the inner diameter portion 113 of the first conductor 11 in the radial direction. Therefore, the current flowing along the inner diameter portion 113 can be interrupted. Therefore, the eddy current can be suppressed, and the reduction in the efficiency of the axial gap type rotating electrical machine 1 can be suppressed.

In addition, each of the plurality of notch portions 13 is located on the inner diameter side of the stator core 21 of the iron core 22 . Therefore, the expansion of the area of each of the plurality of cutout portions 13 can be prevented, and the reduction of the area of the first conductor 11 can be suppressed. Therefore, the reduction of the shielding area can be suppressed. In addition, since each of the plurality of notch portions 13 is located on the inner diameter side of the stator core 21 of the iron core 22, the man-hour for coating the first conductor 11 can be suppressed, and the productivity can be improved.

In addition, the first conductor 11 and the second conductor 12 are made of conductive paint or the like. Therefore, the step of preprocessing the first conductors 11 and the second conductors 12 into shapes corresponding to the parts where they are to be mounted can be eliminated, thereby improving productivity.

In addition, the second conductor 12 is applied not only on the facing surface 91 of the molding resin 9 facing the rotor 3, but also on the end surface 221 facing the rotor 3 of each of the plurality of iron cores 22, and above the inner diameter portion 113 of the first conductor 11 . Therefore, the portion of the second conductor 12 in contact with each of the plurality of iron cores 22 and the inner diameter portion 113 of the first conductor 11 spreads. Therefore, the reliability of the electrical connection between each of the plurality of iron cores 22 and the inner diameter portion 113 of the first conductor 11 can be improved.

In addition, the first conductor 11 and the second conductor 12 can be formed by the same conductive member. Therefore, suppression of manufacturing cost and improvement of working efficiency can be achieved.

In addition, the first conductor 11 and the second conductor 12 can be formed by different conductive members. Therefore, operation efficiency, durability, etc. can be improved by using the conductive member suitable for the shape of the conductor and the position where the conductor is provided.

In addition, the second conductor 12 is preferably linearly coated on the end surface 221 of each of the plurality of iron cores 22 facing the rotor 3 . Therefore, eddy current can be prevented from being generated in the second conductor 12 applied to the end surface 221 of each of the plurality of iron cores 22 facing the rotor 3 .

In particular, the second conductor 12 is preferably linearly coated on the end face 221 of the iron core 22 having a plurality of steel plates laminated in the radial direction of the stator 2 facing the rotor 3 to electrically connect the plurality of steel plates. Therefore, each of the plurality of steel plates constituting the iron core 22 can be grounded, and the electric potential of the iron core 22 can be reliably prevented from becoming a floating potential.

(Second Embodiment) 6 is a schematic view of the casing 5 and the stator 2 of the axial gap type rotating electrical machine 20 according to the second embodiment of the present invention, viewed from the side of the rotor 3 .

The difference between the axial gap type rotating electrical machine 20 of the present embodiment and the axial gap type rotating electrical machine 1 of the first embodiment is the arrangement of the second conductors 15 . That is, the axial gap type rotating electrical machine 20 of the present embodiment includes the second conductor 15 which is located between the iron core 22 on the facing surface 91 of the mold resin 9 facing the rotor 3 . On the outer diameter side of the stator 2 , the outer diameter portion 223 on the outer diameter side of each of the plurality of iron cores 22 arranged annularly is electrically connected to the outer diameter portion 111 of the first conductor 11 . [Effect] The second conductor 15 of the axial gap type rotating electrical machine 20 of the present embodiment is located on the outer diameter side of the stator 2 of the iron core 22 on the opposing surface 91 of the mold resin 9 facing the rotor 3 . Therefore, the ground path of the iron core 22 is shorter than that of the axial gap type rotating electrical machine 1 of the first embodiment, and the resistance value of the ground path can be suppressed. Therefore, the potential difference between each of the plurality of iron cores 22 and the casing 5 can be reduced as compared with the axial gap type rotating electrical machine 1 of the first embodiment, and the generation of the shaft voltage can be suppressed.

In addition, the second conductor 15 of the axial gap type rotating electrical machine 20 of the present embodiment is located on the outer diameter side of the stator 2 of the iron core 22 on the opposing surface 91 of the mold resin 9 facing the rotor 3 . Therefore, the second conductors located on both sides of the iron core 22 in the circumferential direction of the stator 2 are less likely to be broken than the opposing surface 91 of the molded resin 9 facing the rotor 3, and the iron core 22 and the first electrical conductor can be maintained. The electrical connection of the body 11 . Therefore, even if the axial gap type rotating electrical machine 20 of the present embodiment is used for a long period of time, it is not easy for the bearing 6 to be galvanically corroded, and the reduction in the service life can be suppressed.

In addition, the second conductor 15 is preferably linearly coated on the end surface 221 of each of the plurality of iron cores 22 facing the rotor 3 . Therefore, eddy current can be prevented from being generated in the second conductor 15 applied to the end surface 221 of each of the plurality of iron cores 22 facing the rotor 3 .

In particular, the second conductor 15 is preferably linearly coated on the end face 221 of the iron core 22 having a plurality of steel plates laminated in the radial direction of the stator 2 facing the rotor 3 to electrically connect the plurality of steel plates. Therefore, each of the plurality of steel plates constituting the iron core 22 can be grounded, and the electric potential of the iron core 22 can be reliably prevented from becoming a floating potential.

(third embodiment) 7 is a schematic view of the casing 5 and the stator 2 of the axial gap type rotating electrical machine 30 according to the third embodiment of the present invention, viewed from the side of the rotor 3 .

As shown in FIG. 7 , the axial gap type rotating electrical machine 30 of the present embodiment includes the second conductor 12 of the axial gap type rotating electrical machine 1 of the first embodiment, and the axial gap type rotating electrical machine of the second embodiment. Both of the second conductors 15 of 20. [Effect] In the axial gap type rotating electrical machine 30 of the present embodiment, the second conductor 12 is located on the inner diameter side of the stator 2 of the iron core 22 on the opposing surface 91 of the mold resin 9 facing the rotor 3 . That is, when the axial gap type rotating electrical machine 30 is used for a long period of time, the second conductor 12 is coated at a position where a gap is least likely to be generated between the mold resin 9 sealing the iron core 22 and the iron core 22 . Therefore, even if the axial gap type rotating electrical machine 1 is used for a long period of time, the second conductor 12 is not easily broken, and the electrical connection between the iron core 22 and the first conductor 11 can be maintained. Therefore, even if the axial gap type rotating electrical machine 30 of the present embodiment is used for a long period of time, the bearing 6 is less likely to be galvanically corroded, and a reduction in the life span can be suppressed.

Furthermore, the second conductor 15 of the axial gap type rotating electrical machine 30 of the present embodiment is located on the outer diameter side of the stator 2 of the iron core 22 on the opposing surface 91 of the mold resin 9 facing the rotor 3 . Therefore, the ground path of the iron core 22 is shorter than that of the axial gap type rotating electrical machine 1 of the first embodiment, and the resistance value of the ground path can be suppressed. Therefore, the potential difference between each of the plurality of iron cores 22 and the casing 5 can be reduced as compared with the axial gap type rotating electrical machine 1 of the first embodiment, and the generation of the shaft voltage can be further suppressed.

(4th embodiment) 8 is a schematic view of the casing 5 and the stator 2 of the axial gap type rotating electrical machine 40 according to the fourth embodiment of the present invention, viewed from the side of the rotor 3 .

The difference between the axial gap type rotating electrical machine 40 of the present embodiment and the axial gap type rotating electrical machine 1 of the first embodiment is as follows: the guide part 52 is provided with a fitting part 522 , the guide part 52 and the mold resin 9 are provided in the guide part 52 . The first conductor 11 is coated on the specific region 16 of the surface facing the rotor 3 with the fitting portion 522 as the center.

FIG. 9 shows an enlarged perspective view of the fitting portion 522 of the axial gap type rotating electrical machine 1 according to the first embodiment of the present invention. As shown in FIG. 9 , the fitting portion 522 is a concave portion recessed from the inner peripheral wall 523 of the guide portion 52 toward the outer diameter direction of the cylindrical portion 51 . The fitting portion 522 has a portion where the gap width of the fitting portion 522 in the circumferential direction of the cylindrical portion 51 is wider on the outer diameter side than the inner diameter side. Thereby, the fitting portion 522 has a necked-down portion.

The specific area 16 shown in FIG. 8 prevents the molding resin 9 in contact with the inner peripheral wall of the guide portion 52 from leaving the inside of the guide portion 52 by the molding resin 9 filled in the fitting portion 522 and cured. The area around the wall.

In addition, the range of the specific region 16 varies depending on the shape of the fitting portion 522 and the material of the molding resin 9 . In addition, the first conductor 11 is preferably provided in the entire specific region 16 , but may be provided in a part of the specific region 16 including the joint portion of the guide portion 52 and the molding resin 9 . [Effect] The molded resin 9 filled and cured in the fitting portion 522 is still fitted in the fitting portion even if it contracts in the radial direction of the stator 2 and leaves the inner peripheral wall of the guide portion 52 due to deterioration over time, etc. The portion of the constricted shape of 522 is restrained from leaving the inner peripheral wall of the guide portion 52 .

In addition, since the first conductor 11 is coated on the specific area 16, the electrical connection between the iron core 22 and the casing 5 of the axial gap type rotating electrical machine 1 used for a long period of time can be maintained. Thereby, the electric corrosion of the bearing 6 is further suppressed, and the axial gap type rotating electrical machine 40 with high reliability against the electric corrosion of the bearing can be provided.

(5th embodiment) 10 is an axial cross-sectional view of a casing and a stator of an axial gap type rotating electrical machine 50 according to a fifth embodiment of the present invention.

The axial gap type rotating electrical machine 50 of the present embodiment differs from the axial gap type rotating electrical machine 1 of the first embodiment in that the core 22 and the coil 24 are provided with an insulator 26 such as an insulating sheet. As for insulation, the flange portion 232 of the bobbin 23 is not provided between the first conductor 11 and the coil 24 .

That is, in the axial gap type rotating electrical machine 1 of the first embodiment, the iron core 22 and the coil 24 are insulated by the bobbin 23, and the bobbin 23 includes: a cylindrical portion 231 surrounding the iron core 22; and The flange portion 232 regulates the winding width of the coil 24 extending in the circumferential direction along the shape of the opening edge from the vicinity of the openings at both ends of the cylindrical portion 231 . On the other hand, the axial gap type rotating electrical machine 50 of the present embodiment includes only the cylindrical portion 231 , and the core 22 and the coil 24 are insulated by the insulator 26 (eg, insulating sheet) without the flange portion 232 . Therefore, the mold resin 9 located between the first conductor 11 and the coil 24 of the axial gap type rotating electrical machine 50 of the present embodiment is in contact with the first conductor 11 and the coil 24 . [Effect] The insulator 26 of the axial gap type rotating electrical machine 50 of the present embodiment does not have the flange portion 232 . Therefore, the bobbin 23 can be easily manufactured, and the cost can be suppressed.

(Sixth Embodiment) 11 is a schematic view of the casing 5 and the stator 2 of the axial gap type rotating electrical machine 60 according to the sixth embodiment of the present invention, viewed from the side of the rotor 3 . 12 is an axial cross-sectional view of the housing and the stator of the axial gap type rotating electrical machine according to the sixth embodiment of the present invention.

The axial gap type rotating electrical machine 60 of this embodiment differs from the axial gap type rotating electrical machine 1 of the first embodiment in that the conductor 10 is provided on the flange portion 232 of the bobbin 23 On the opposite surface 233 facing the rotor 3, the resin 9 is not molded.

That is, the axial gap type rotating electrical machine 60 of the present embodiment includes: a plurality of stator cores 21 in which the coils 24 are wound through the bobbins 23 covering the side surfaces of the iron cores 22; The cores 21 are arranged annularly; the rotor 3 is opposite to the stator 2 across an air gap; the casing 5 covers the stator 2; The opposing surface 233 facing the rotor 3; the first conductor 11, which is annular, is arranged on the opposing surface 233 to surround the circumference of the iron core 22, and a part of the circumference of the core 22 has a notch 13 , and is electrically connected to the casing 5; and the second conductor 12, which is located on the opposite surface 233, on the inner diameter side of the stator 2 of the iron core 22, and is arranged to electrically connect the first conductor 11 and the iron core 22. connect.

11 and 12, the first conductor 11 of the present embodiment will be described in detail. The first conductor 11 is a conductive paint or the like applied to the opposite surface 233 of the flange portion 232 of the bobbin 23 facing the rotor 3 , and has an annular portion 114 surrounding the circumference of the iron core 22 and a notch Section 13.

The annular portion 114 is in contact with the guide portion 52 of the housing 5 . Therefore, the first conductor 11 is electrically connected to the case 5 . In addition, the insulating tape 14 is formed between the annular portion 114 and the iron core 22 . The insulating tape 14 is an insulator protruding annularly along the opening of the cylindrical portion 231 of the bobbin 23 from the opposing surface 233 of the flange portion 232 facing the rotor 3 . Therefore, each of the plurality of iron cores 22 and the first conductor 11 are insulated by the insulating tape 14 .

The notch portion 13 is a portion that electrically cuts off the annular portion 114 surrounding the iron core 22 . The annular portion 114 is electrically cut off by the notch portion 13, and the current flowing along the annular portion 114 is interrupted, thereby preventing the generation of eddy currents.

Specifically, the notch portion 13 is an insulator that protrudes from the opposite surface 233 of the flange portion 232 facing the rotor 3 and is connected to the insulating tape 14 and the outer edge of the flange portion 232 .

In addition, the axial gap type rotating electrical machine 60 of the present embodiment is similar to the axial gap type rotating electrical machine 100 of the comparative example. If it is used for a long period of time, the inside of the bobbin 23 that is in contact with each side surface of the iron core 22 The side surfaces 234 to 237 are deformed and separated from the iron core 22 , and a gap is generated between the inner side surfaces 234 to 237 and the side surfaces of the iron core 22 .

The inventors have found from the axial gap type rotating electrical machine that has been used for a long period of time, the generation of the gap is the same as that of the first embodiment. The inner side surfaces 234 and 235 are mostly on the inner diameter side of the stator 2 and the inner side surface 237 which is in contact with the side surface of the iron core 22 is the least. Therefore, in the axial gap type rotating electrical machine 60 of the present embodiment, as shown in FIG. 11 , the second conductor 12 is positioned on the stator 2 of the iron core 22 on the opposite surface 233 of the flange portion 232 facing the rotor 3 . On the inner diameter side, the inner diameter portion 222 on the inner diameter side of the iron core 22 is electrically connected to the inner diameter portion 113 of the first conductor 11 .

Furthermore, as shown in FIG. 11 , the second conductor 12 may be applied not only to the opposite surface 233 of the flange portion 232 facing the rotor 3 , but also to each of the plurality of cores 22 and the rotor. 3. On the opposite end face 221 and on the inner diameter portion 113 of the first conductor 11.

In addition, the first conductor 11 and the second conductor 12 may be formed of the same conductor. In addition, the first conductor 11 is provided only on the opposite surface 233 of the flange portion 232 of the bobbin 23 facing the rotor 3, surrounds each of the plurality of iron cores 22, and has a cutout portion 13, so that a combination of circles is formed. Arc and rectangle shapes. On the other hand, the second conductor 12 is provided on the opposite surface 233 of the flange portion 232 of the bobbin 23 facing the rotor 3, on the end surface 221 of the iron core 22 facing the rotor 3, and on the first The three different parts on the conductor 11 have a simple shape that is only a rectangle. Therefore, the first conductor 11 and the second conductor 12 may be formed of different conductors. For example, a conductive paint may be used for the first conductor 11 , and a conductive tape may be used for the second conductor 12 . [Effect] In the axial gap type rotating electrical machine 60 of the present embodiment, since the first conductor 11 is electrically connected to the casing 5, the first conductor 11 can be grounded through the casing 5 to prevent the potential of the first conductor 11 from becoming a floating potential , while suppressing the generation of shaft voltage.

In addition, the iron core 22 is electrically connected to the first conductor 11 via the second conductor 12 . Therefore, the iron core 22 can be grounded via the first conductor 11 and the plurality of second conductors 12 via the case 5 , the electric potential of the iron core 22 can be prevented from becoming a floating potential, and the generation of axial voltage can be suppressed.

In particular, the second conductor 12 of the axial gap type rotating electrical machine 60 of the present embodiment is coated on the opposite surface 233 of the flange portion 232 of the spool tube 23 facing the rotor 3, and applied to the iron core 22. The inner diameter side of the stator 2 . That is, when the axial gap type rotating electrical machine 60 is used for a long period of time, a gap is most likely to be generated between the inner side surface of the bobbin 23 in contact with the iron core 22 and the side surface of the iron core 22, and the first coating is applied. 2 conductors 12. Therefore, even if the axial gap type rotating electrical machine 60 is used for a long period of time, the second conductor 12 is not easily broken, and the electrical connection between the iron core 22 and the first conductor 11 can be maintained. Therefore, even if the axial gap type rotating electrical machine 60 of the present embodiment is used for a long period of time, it is not easy for the bearing 6 to be galvanically corroded, and the reduction of the service life can be suppressed.

In addition, in the axial gap type rotating electrical machine 60 of the present embodiment, the notch portion 13 is provided in the first conductor 11 . Therefore, the current flowing along the annular portion 114 can be interrupted. Therefore, the eddy current can be suppressed, and the reduction of the efficiency of the axial gap type rotating electrical machine 60 can be suppressed.

In addition, the second conductor 12 is applied not only to the facing surface 233 of the flange portion 232 of the bobbin 23 that faces the rotor 3 , but also to each of the plurality of iron cores 22 facing the rotor 3 . on the end surface 221 and the inner diameter portion 113 of the first conductor 11 . Therefore, the electrical connection between each of the plurality of iron cores 22 and the inner diameter portion 113 of the first conductor 11 can be strengthened.

In addition, the first conductor 11 and the second conductor 12 can be formed by the same conductor. Therefore, work efficiency can be improved.

Moreover, the 1st conductor 11 and the 2nd conductor 12 can be formed by different conductors using the material suitable for the location where each is arrange|positioned. Therefore, work efficiency, durability, and the like can be improved.

In addition, the second conductor 12 is preferably linearly coated on the end surface 221 of each of the plurality of iron cores 22 facing the rotor 3 . Therefore, eddy current can be prevented from being generated in the second conductor 12 applied to the end surface 221 of each of the plurality of iron cores 22 facing the rotor 3 .

In particular, the second conductor 12 is preferably linearly coated on the end face 221 of the iron core 22 having a plurality of steel plates laminated in the radial direction of the stator 2 facing the rotor 3 to electrically connect the plurality of steel plates. Therefore, each of the plurality of steel plates constituting the iron core 22 can be grounded, and the electric potential of the iron core 22 can be reliably prevented from becoming a floating potential.

In addition, the present invention is not limited to the above-mentioned embodiment, and includes various modifications. For example, the above-mentioned embodiment is described in detail in order to explain the present invention easily, but it is not necessarily limited to those having all the components described. Moreover, a part of the structure of a certain embodiment may be replaced with the structure of another embodiment, and the structure of another embodiment may be added to the structure of a certain embodiment. Moreover, with respect to a part of the structure of each embodiment, addition, deletion, and replacement of other structures can be performed.

In addition, the embodiment of this invention may be the following aspects. The axial gap type rotating electrical machine may be of a single rotor type. In addition, the iron core 22 can be molded with magnetic iron powder. In addition, although the example of 12 slots is shown, other numbers of slots may be used. In addition, other materials, such as composite resins, films, and inorganic fibers, may be provided on the conductor 10 to improve the adhesion, adhesion, heat resistance, and the like of the conductor 10 . In addition, the surface on which the conductive paint is applied can be made rough, and the anchor effect can be exerted.

1, 20, 30, 40, 50, 60, 100: Axial Gap Type Rotary Electric Machines 2: Stator 3: Rotor 4: Axis 5: Shell 6: Bearing 7: Front shell 8: Rear shell 9: Molding resin 10: Conductor 11: 1st conductor 12, 15: 2nd conductor 13: Notch part 14: Insulating tape 16: Area 21: stator core 22: Iron core 23: Reel bobbin 24: Coil 25: Axial hole/through hole 26: Insulator 31: Magnets 32: Back Yoke 33: Abutment 33a: annular groove 33b: Through hole 51: Cylinder part 52: Guidance Department 91, 233, 521: Opposite faces 92~95: sealing surface 101: Ring part 102: Ring Department 111, 223: outer diameter part 112: Middle part 113, 222: Inner diameter part 114: Ring part 141: 1st insulating tape 142: 2nd insulating tape 143: 3rd insulating tape 144: 4th insulating tape 221: End face 231: Tube 232: Flange 234~237: inner side 251: annular convex part 522: Fitting part 523: Inner Peripheral Wall

FIG. 1 is a cross-sectional perspective view of an axial gap type rotating electrical machine of a comparative example. 2 is an axial cross-sectional view of a casing and a stator of an axial gap type rotating electrical machine of a comparative example. 3 is a perspective view of a stator, a rotor and a casing of an axial gap type rotating electrical machine of a comparative example. 4 is a schematic view of the casing and the stator of the axial gap type rotating electrical machine of the comparative example viewed from the axial direction of the side where the conductor is provided. 5 is a schematic view of the casing and the stator of the axial gap type rotating electrical machine according to the first embodiment of the present invention, viewed from the rotor side. 6 is a schematic view of the casing and the stator of the axial gap type rotating electrical machine according to the second embodiment of the present invention, viewed from the rotor side. 7 is a schematic view of the casing and the stator of the axial gap type rotating electrical machine according to the third embodiment of the present invention, viewed from the rotor side. 8 is a schematic view of the casing and the stator of the axial gap type rotating electrical machine according to the fourth embodiment of the present invention, viewed from the rotor side. 9 is an enlarged perspective view of a fitting portion of an axial gap type rotating electrical machine according to a fourth embodiment of the present invention. 10 is an axial cross-sectional view of a casing and a stator of an axial gap type rotating electrical machine according to a fifth embodiment of the present invention. 11 is a schematic view of the casing and the stator of the axial gap type rotating electrical machine according to the sixth embodiment of the present invention, viewed from the rotor side. 12 is an axial cross-sectional view of a housing and a stator of an axial gap type rotating electrical machine according to a sixth embodiment of the present invention.

1: Axial gap type rotating electrical machine

2: Stator

5: Shell

9: Molding resin

10: Conductor

11: 1st conductor

12: 2nd conductor

13: Notch part

14: Insulating tape

22: Iron core

25: Axial hole/through hole

51: Cylinder part

52: Guidance Department

92~95: sealing surface

111: Outer diameter part

112: Middle part

113,222: Inner diameter part

114: Ring part

141: 1st insulating tape

142: 2nd insulating tape

143: 3rd insulating tape

144: 4th insulating tape

221: End face

251: annular convex part

Claims (15)

An axial gap type rotating electrical machine is characterized by having: A plurality of stator cores, which are wound with coils on the iron cores; a stator, which is formed by the aforementioned plurality of stator cores arranged annularly; a rotor facing the aforementioned stator across an air gap; a housing covering the aforementioned stator; a molding resin, which seals the side surface of the iron core and has an opposing surface facing the rotor; A first conductor, which is annular, is disposed on the opposite surface so as to surround the circumference of the iron core, has a notch in a part of the circumference of the iron core, and is electrically connected to the casing; and The second conductor is located on at least one of the inner diameter side and the outer diameter side of the stator of the iron core on the opposing surface, and is provided to electrically connect the first conductor and the iron core. The axial gap type rotating electrical machine according to claim 1, wherein the first conductor and the second conductor are conductive paint or conductive adhesive. The axial gap type rotating electrical machine according to claim 2, wherein the second electrical conductor is coated on the iron core and the first electrical conductor. The axial gap type rotating electrical machine of claim 1, wherein the stator has a through hole in the center; and The notch portion is connected to the molding resin forming the opening edge of the through hole. The axial gap type rotating electrical machine according to claim 4, wherein the notch portion is located on the inner diameter side of the stator core of the iron core. The axial gap type rotating electrical machine according to claim 1, wherein the housing is provided with a fitting portion to be fitted with the mold resin. The axial gap type rotating electrical machine according to claim 1, wherein the molding resin located between the first electrical conductor and the coil among the molding resins is in contact with the first electrical conductor and the coil. The axial gap type rotating electrical machine according to claim 1, wherein the first conductor and the second conductor are formed of the same conductive member. The axial gap type rotating electrical machine according to claim 1, wherein the first electrical conductor and the second electrical conductor are formed of different conductive members. The axial gap type rotating electrical machine of claim 1, wherein the iron core has a plurality of steel plates laminated in the radial direction of the stator; and The second conductor is linearly provided on the end face of the iron core facing the rotor, and electrically connects the plurality of steel plates. An axial gap type rotating electrical machine is characterized by having: A plurality of stator cores, which are wound with coils through bobbins covering the sides of the iron cores; a stator, which is formed by the aforementioned plurality of stator cores arranged annularly; a rotor facing the aforementioned stator across an air gap; a housing covering the aforementioned stator; a flange portion, which is provided at the end of the reel tube and has an opposite surface facing the rotor; A first conductor, which is annular, is disposed on the opposite surface so as to surround the circumference of the iron core, has a notch in a part of the circumference of the iron core, and is electrically connected to the casing; and The second conductor is located on the inner diameter side of the stator of the iron core on the opposing surface, and is provided to electrically connect the first conductor and the iron core. The axial gap type rotating electrical machine according to claim 11, wherein the first conductor and the second conductor are conductive paint or conductive adhesive. The axial gap type rotating electrical machine according to claim 12, wherein the second conductor is coated on the iron core and the first conductor. The axial gap type rotating electrical machine according to claim 11, wherein the first electrical conductor and the second electrical conductor are formed of the same electrical conductor. The axial gap type rotating electrical machine according to claim 11, wherein the first electrical conductor and the second electrical conductor are formed of different electrical conductors.

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