WO2017090074A1

WO2017090074A1 - Axial gap-type rotary electric machine and rotary electric machine stator

Info

Publication number: WO2017090074A1
Application number: PCT/JP2015/082814
Authority: WO
Inventors: 博洋床井; 高橋　秀一; 恭永米岡; 利文鈴木; 健児鵜澤; 山崎　克之; 酒井　亨; 正木　良三
Original assignee: 株式会社日立産機システム
Priority date: 2015-11-24
Filing date: 2015-11-24
Publication date: 2017-06-01
Also published as: JP6547006B2; TWI638502B; JPWO2017090074A1; TW201722035A

Abstract

The purpose of the present invention is to prevent bearing voltage and to achieve miniaturization and high performance of a rotary electric machine. Provided is an axial gap-type rotary electric machine which has: a stator in which a plurality of core members having a stator core around which windings are wound in the circumferential direction are arranged annularly around a rotating shaft and are integrally molded with resin; a rotor facing a magnetic flux surface of the stator via a gap in the rotation axis direction; and a rotating shaft that co-rotates with the rotor and penetrates the rotation axis of the stator. The stator has a tubular shape along the outer peripheral shape of the rotation axis, and has a shielding member electrically shields the windings and the radially facing section of the rotating shaft. The shieling member has a plurality of connection holes at a constant density penetrating in the radial direction in the entire circumferential surface sandwiched between the windings and the radial facing section of the rotating shaft. The area ratio of the plurality of connection holes occupying the entire circumferential surface is greater than the area ratio of a portion outside of the plurality of connection holes, and resin is filled from an outer diameter side to an inner diameter side in at least a part of the shielding member via the connection holes.

Description

Axial gap type rotating electrical machines and stators for rotating electrical machines

The present invention relates to an axial gap type rotating electrical machine and a stator for a rotating electrical machine, and more particularly to a stator for a rotating electrical machine molded with resin and a rotating electrical machine having the stator.

An axial gap type rotating electrical machine is known as an effective means for making the rotating electrical machine thinner and more efficient. Patent Document 1 includes a plurality of stator core members arranged in an annular shape and two rotors arranged so as to sandwich the stator from both sides in the axial direction, and these magnetic flux surfaces face a predetermined gap in the axial direction. An axial gap type rotating electrical machine is disclosed.

In general, in an axial gap type rotating electrical machine, the opposing area of a stator and a rotor that generate torque (hereinafter sometimes referred to as “gap area”) is proportional to the square of the diameter. Can increase the output and efficiency. In particular, since the rotor can be configured relatively easily, the development of an axial gap type rotating electrical machine using a permanent magnet such as neodymium or ferrite has been promoted.

When a permanent magnet type rotating electrical machine is driven by an inverter, torque is obtained by passing a current synchronized with the magnet position through the winding. At this time, the common mode voltage generated by the inverter is electrostatically coupled to the rotor side, and a voltage (hereinafter referred to as “shaft voltage”) is generated between the inner and outer rings of the bearing. It is known that excessive shaft voltage causes bearing corrosion and reduces the life of the bearing. Axial gap type rotating electrical machines increase the gap area per physique, such as a structure in which two rotors are arranged to sandwich the stator, or a structure in which two stators are arranged to sandwich the rotor. In some cases, it is possible to devise such as generating torque more efficiently. Such a tendency that the facing area between the winding and the rotor expands is due to an increasing tendency of the shaft voltage.

Also, in the axial gap type rotating electrical machine, the winding is concentrically opposed to the shaft because the shaft is disposed so as to penetrate the center in the radial direction of the stator. Generally, in order to reduce the size, increase the output, increase the efficiency, and reduce the cost of a rotating electrical machine, it is effective to densely arrange cores and electric wires in a limited space, that is, increase the space utilization rate. For this reason, the distance between the winding and the shaft is often close, and the influence on the shaft voltage cannot be ignored.

As one of the means for reducing the shaft voltage, it is known that electrostatic shielding between the winding and the rotor is effective. In Patent Document 1, the winding and the rotor are shielded by a plate-like conductive material that conducts between the stator core and the housing, and further, between the shaft and the winding concentrically facing the shaft. A configuration is disclosed in which a cylindrical shielding member is disposed along the outer peripheral shape of the shaft, and the shielding member and the housing are electrically connected by the conductive material to prevent generation of axial voltage.
Such a structure shields most of the capacitance generated between the winding and the rotor and shaft. Therefore, the shaft voltage of the axial gap type rotating electrical machine can be greatly reduced by shielding the static electricity generated in the region.

JP 2014-17915 A

考える Consider reducing the size and density of axial gap rotating electrical machines. Although miniaturization and high density can be realized by advancing simplification and thinning of each constituent member, generally thinning and strength tend to trade off. For example, even if the shielding member disclosed in Patent Document 1 is made thinner, the gap between the winding and the shaft can be further reduced, and the output is improved by reducing the radial direction and increasing the coil volume factor. In addition, it is possible to reduce the size relative to the rating.

Here, an example of a process of molding the stator of the axial gap type rotating electric machine with resin will be described with reference to the drawings. FIG. 1 schematically shows one aspect of the resin molding process of the stator. As shown in the sectional view in the axial direction of FIG. 1A, a lower mold 201 having the same diameter as the housing inner diameter is inserted from one inner cylinder side of the housing 50. As shown in the front view observed from the direction of the rotation axis in FIG. 1B, a plurality of core members X are arranged in an annular shape on the upper surface of the lower mold 201 around the rotation axis. A cylindrical or rod-shaped core 202 is disposed on the axis through which the shaft is inserted. The core material 202 has a diameter such that the outer periphery of the shaft and the stator after molding are not in contact with each other. In addition, a cylindrical shielding member X along the outer peripheral shape of the core 202 is disposed between the outer peripheral surface of the core member 202 and the stator winding 220.

After the lower mold 201, the core member 200, the core material 202 and the shielding member X are arranged, an upper mold (not shown) having the same diameter as that of the housing 50 is inserted. The upper mold and the lower mold are provided with holes for enclosing the resin on the stator side, and encapsulate the resin with a predetermined pressure. Thereafter, when the upper mold, the core 202, and the lower mold 201 are removed from the housing 50, a resin mold stator having a state in which the surface is molded can be obtained while being fixed to the housing 50. The shielding member X is held at the center of the stator, and a shaft voltage can be prevented by electrically connecting a part of the shielding member X and the housing 50 with a conductive plate.

¡In order to obtain sufficient holding strength of the stator by molding, it is necessary to uniformly fill the resin into the gaps of the above parts. For this reason, in order to ensure more reliable reliability, the resin sealing pressure is often increased. The shielding member X thinned for miniaturization is deformed by the pressure of the high-pressure encapsulating resin, and as a result, there is a possibility that a required gap on the shaft side, uniform filling of the resin, etc. may not be realized. . For example, as shown by reference sign c in FIG. 1B, the bending deformation of the shielding member X causes nonuniform filling of the resin 30.

The effect of deformation of the shielding member on the rotating electrical machine will be described. First, (1) the effect of reducing the axial voltage is reduced by reducing the shielding area between the winding and the shaft. In addition, (2) since the shielding member approaches the winding, it is difficult to stably secure the electrical insulation distance. Furthermore, (3) since a resin layer with a varying thickness or position is formed inside the shielding member, the resin is detached due to vibration or thermal stress during operation of the rotating electric machine, and abnormal noise or damage of the rotating electric machine due to this. There is a risk.
A technology that ensures reliability of bearing power and realizes downsizing, high density, and performance is desired.

In order to solve the above problems, for example, the configuration described in the claims is applied. That is, a plurality of core members each having a stator core wound with a winding in a circumferential direction are arranged in an annular shape around a rotation axis, and a stator integrally molded with resin, and a magnetic flux surface of the stator An axial gap type rotating electrical machine having a rotor facing through a gap in a rotation axis direction and a rotation shaft that rotates together with the rotor and passes through a rotation axis of the stator, wherein the stator is And having a cylindrical shape along the outer peripheral shape of the rotating shaft, and having a shielding member that electrically shields the winding and the radially opposing portion of the rotating shaft, and the shielding member is the winding And a plurality of communication holes penetrating in the radial direction at a constant density on the entire peripheral surface sandwiched between the radially opposing portions of the rotating shaft, and the area ratio of the plurality of communication holes in the entire peripheral surface Is larger than the area ratio of the portion other than the plurality of communication holes. There, at least a portion of the shielding member, through the communication hole, the across the outer diameter side to the inner diameter side resin is configured to be filled.

Further, as another configuration, for example, a plurality of core members having a stator core wound with a winding in the circumferential direction are arranged in an annular shape around the rotation axis and fixed integrally with resin. An axial gap type comprising: a rotor; a rotor facing a magnetic flux surface of the stator through a gap in a rotation axis direction; and a rotation axis that rotates together with the rotor and passes through the rotation axis of the stator. A rotating electrical machine, wherein the stator has a cylindrical shape extending along an outer peripheral shape of the shaft, and includes a shielding member that electrically shields a radial facing portion between the winding and the rotating shaft. The shielding member is made of a mesh member, and at least a part of the shielding member is filled with the resin from the outer diameter side to the inner diameter side through the mesh of the mesh member.

Furthermore, for example, a plurality of core members each having a stator core that is wound in the circumferential direction and generates a magnetic flux in the rotation axis direction are arranged in an annular shape around the rotation axis and molded with resin. A stator for a rotating electrical machine, wherein the stator has a through hole into which the rotating shaft is inserted, and a cylindrical shape along the outer peripheral shape of the rotating shaft, and the radial direction of the winding and the rotating shaft A shielding member that electrically shields the facing portion, and the shielding member has a plurality of communication holes penetrating in a radial direction on an entire circumferential surface sandwiched between the winding and the radially facing portion of the rotating shaft. The hole has a constant density, and an area ratio of the plurality of communication holes occupying the entire peripheral surface is larger than an area ratio of a portion other than the plurality of communication holes, and at least a part of the shielding member In addition, from the outer diameter side to the inner diameter side through the communication hole Serial resin is configured to be filled.

According to one aspect of the present invention, it is possible to achieve suppression of bearing electrolytic corrosion due to reduction of shaft voltage, and miniaturization, high output, high efficiency, and low cost.
Problems, configurations, and effects other than those described above will be apparent from the following description.

It is a schematic diagram for demonstrating a prior art. It is an axial secondary sectional view of a motor which is an embodiment to which the present invention is applied. It is a perspective view which shows typically the structure of the core member by a present Example. It is a longitudinal cross-sectional perspective view which shows typically the example of arrangement | positioning of the shielding member by a present Example. It is a schematic diagram for demonstrating the communicating hole of the shielding member by a present Example. It is a schematic diagram which shows the state of the resin mold process at the time of applying the shielding member by a present Example. It is a perspective view which shows typically the structural example of the shielding member by a present Example. It is a schematic diagram which shows the member example of the shielding member by a present Example. It is a secondary cross-sectional perspective view which shows typically the structure of the conduction | electrical_connection member for earthing | grounding by a present Example. The grounding structure of the conduction | electrical_connection member by a present Example is shown typically.

Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 2 is a sectional view in the axial direction of a motor 100 that is an embodiment to which the present invention is applied. The motor 100 includes one annular stator 10 and two disk-shaped rotors 40 so as to sandwich the stator 10 from the axial direction, and these magnetic flux surfaces pass through a predetermined air gap in the rotational axis direction. Opposite to each other, a double rotor type axial gap type permanent magnet synchronous motor.

The stator 10 has a configuration in which a plurality of core members 20 are annularly arranged in a radial direction around a shaft 70, and the plurality of core members 20 are integrally molded with a resin 30 in a housing 50. The plurality of core members 20 are formed into an annular body having a through hole into which the rotation shaft 70 is inserted at the center by the molding, and are fixed integrally in the housing. In addition, this invention is not limited to the mold in the housing 50, It can replace with this and can apply also to the structure which obtains the resin-molded stator using a shaping | molding die.

FIG. 3 schematically shows a perspective view of the core member 20. As shown in FIG. 2A, the core member 20 includes a core 21, a winding 22 wound around the outer periphery of the core, and a bobbin 23 disposed between them for insulation. The core 21 is a metal core made of laminated steel plate, thick powder, or machined. In this embodiment, a columnar core in which amorphous foil strips having a thickness of about 0.1 to 0.3 mm are laminated in the radial direction is used.

FIG. 2B shows a perspective view of the bobbin 23. The bobbin 23 is made of an insulating member such as resin and has a cylindrical shape formed along the outer peripheral shape of the core 21. The insulating member can be replaced with insulating paper or an insulating agent applied to the winding, and the present invention is not limited to these examples. By winding the winding 22 around the outer periphery of the bobbin 23 in which the core 21 is inserted into the inner cylinder, or by inserting the core 21 into the inner cylinder of the bobbin 23 in which the winding 22 is wound around the outer cylinder, the core member 20 is obtain. Moreover, the bobbin 23 has the collar part 24 extended | stretched by the predetermined distance width | variety rotation direction along the outer periphery of a cylinder part in the both-ends edge part of an axial direction, and the cylinder part 25 extended in an axial direction between these. In the present embodiment, the distal end 24 a of the flange portion 24 in the rotational axis direction contacts the shielding member 90, functions as positioning of the core member 20, and has a function of determining the winding limit of the winding 22. That is, since the winding 22 and the shielding member 90 need not be in contact with each other, it is possible to restrict the winding position from the root of the cylindrical portion 25 to the position less than the position 24a in the rotational axis direction.

1, the rotor 40 includes a permanent magnet 41 disposed to face the core 21, a back yoke 42 provided on the back surface of the permanent magnet 41, and a yoke 43 that holds them. The yoke 43 is an annular body having a through hole at the center, and the through hole and the shaft 70 are coupled. Similarly, the shaft 70 arranges the bearings 80 on the load side and the anti-load side. The end bracket 60 holds the shaft 70 and the rotor 40 rotatably via the bearing 80. The end bracket 60 is mechanically connected to the housing 50. The housing 50 is held in an electrically grounded state.

A shield member 90 that is one of the features of the present embodiment is provided on the inner diameter side of the winding 22. FIG. 4 shows a perspective view of the shielding member 90. The shielding member 90 has a cylindrical shape having at least an axial length equal to or larger than the axial width of the winding 22 facing the outer periphery of the shaft 70, and electrically shields between the members. The shielding member 90 may be configured such that a flat plate member is rounded into a cylindrical shape, or may be a seamless cylindrical member formed by molding. In the present embodiment, the shielding member 90 is obtained from a thin member (for example, a sheet-like member) for the purpose of downsizing in the radial direction.

Moreover, the shielding member 90 has a plurality of communication holes 91 penetrating in the radial direction as a whole. The communication holes 91 are arranged so densely that the ratio of the area occupied with respect to the peripheral surface of the shielding member 90 is larger than the area of the portion other than the communication holes 91. Preferably, the communication holes 91 are regularly provided at regular intervals (constant density) in the rotation axis direction and the circumferential direction of the shielding member 91. Thereby, the flow path resistance of the shielding member with respect to the resin 30 is made uniform, and the deformation of the shielding member 90 can be more effectively suppressed.

As a more specific example, it is preferable that the size of each communication hole 91 is equal, the density of adjacent communication holes 91 is high, and the distance is equal in the vertical and horizontal directions. That is, as schematically shown in FIG. 5, if the communication holes 91 are dense, the flow resistance becomes non-uniform, pressure distribution from the resin occurs, and the strength of the shielding member 90 also becomes non-uniform. This is because there is a high possibility that this will occur. In addition, for example, it can be said that the width or height of the communication port is preferably larger than the plate thickness of the shielding member 90. This is because the flow resistance when the resin 30 passes through the communication hole 91 can be effectively reduced, and deformation of the inner peripheral shielding plate can be suppressed.

The resin that enters from the outer diameter side by sealing passes through the communication hole 91 and then immediately flows from the inner diameter side to the outer diameter through the communication hole 91 in the vicinity, so that the shielding member 90 for the sealing resin 90 Resistance can be reduced and deformation can be prevented. As a configuration suitable for obtaining such an effect, a mesh-shaped metal member is used in the present embodiment in the example of FIG. In addition, each lattice-like mesh functions as the communication hole 91. In this aspect, since the connecting portion between the resin 30 layer on the inner diameter side and the resin 30 layer on the outer diameter side of the shielding member 90 is more evenly dispersed, the holding strength of the resin 30 layer on the inner diameter side is equalized. Thereby, detachment | desorption of the resin 30 layer of an internal diameter side is suppressed effectively.

In addition, since a part of the magnetic flux is linked to the shielding member 90, an eddy current flows on the surface and becomes a loss. If a plurality of communication holes 91 are provided, the flow of eddy current increases, so that the electrical resistance of the shielding member 90 increases equivalently. Thereby, the effect that the eddy current loss of the shielding member 90 reduces and motor efficiency improves can also be acquired.

In FIG. 6, the process at the time of resin sealing at the time of applying the shielding member 90 and the state after molding are shown.
Typical resin molding includes vacuum casting, transfer molding, and injection molding. Transfer molding and injection molding suppress the generation of voids by injecting resin under high pressure. Although there is a load that the resin exerts on the workpiece due to the high pressure, there is an advantage that the molding time can be greatly reduced.
In vacuum casting, resin is injected into a workpiece under low pressure conditions to remove air and suppress the generation of voids. The load exerted on the workpiece such as the shielding member and the core member is small, and the molding time is long. In this embodiment, transfer molding and injection molding are applied. However, the present invention can sufficiently achieve the effect even in the case of vacuum casting.

As shown in the secondary sectional view of FIG. 6A, a shielding member 90 is disposed in a portion of the core 202 facing the winding 22. The shielding member 90 is disposed so as to be wound around the core 202. A housing 50 is disposed on the outer diameter side of the core member 20, the lower mold 201, and the upper mold (not shown). The mold and the core member 20 are temperature controlled by a heater or the like incorporated in the mold. The upper mold is provided with one or a plurality of openings, and the resin 30 is injected in several seconds to several tens of seconds. The injected resin 30 is filled as a whole with a gap between the core members 20 or a gap between the core member 20 and the housing 50 as a flow path. For example, a pressure of about several MPa to several tens of MPa is applied to the resin 30.

Fig. 6 (b) shows a cross section taken along the line BB 'after molding. The top view of the stator 10, the housing 50, and the shielding member 90 is shown. It can be seen that a part of the shielding member 90 swells to the outer diameter side, and the resin 30 is adhered between the swelled part and the core 202. The shielding member 90 is disposed between the winding 22 and the shaft 70 without being substantially deformed, and can be electrically shielded.

In addition, FIG.6 (b) is an example and may become a mode which changes with every resin enclosure. For example, FIG. 6B shows that the resin wraps around all between the core 202 and the shielding member, but the resin does not turn to a part of the inner diameter and the surface is exposed to the core 202 side. It is also possible. Further, the shielding member 90 may be slightly expanded to the outer diameter side. This is because the resin that has entered the inner diameter side spreads toward the outer diameter side. Such variations often depend on the shape of the flow path formed by the gap between the members, the temperature distribution of the members, or other environmental factors (air temperature, atmospheric pressure, etc.) in addition to the variations in the materials themselves, and the same results are always obtained. It is difficult.

However, in any case, the amount of deformation or displacement of the position is in a range sufficient for electrical and magnetic shielding of the winding portion facing the shaft 70. That is, the communication holes 91 of the same size are arranged at equal density and at equal intervals, so that the resistance applied to the shielding member 90 is small, the pressure distribution of the resin is less likely to occur, and / or the strength of the shielding member 90 with a regular composition. This is to ensure.

In particular, the communication hole 91 makes it possible for the resin to enter the inner diameter from the outer diameter, and the resin that has entered easily escapes to the outer diameter side, so that the shielding member 91 is held by the resin by the wraparound. Such a holding mode can hardly be expected with a shielding member that has only been thinned, and there is a significant risk of falling off the rotor due to rotational vibration, thermal stress, etc., but this embodiment also solves such problems. can do.

By the way, as the shielding member 90, a cylindrical member continuously formed integrally by pressing or extrusion may be used, or a grid-like mesh member (net-like member) made of a sheet member having a predetermined thickness is cut. A rounded product may be applied. The former has merit in terms of strength of the shielding member 90, and the latter has merit in terms of molding and cost.

FIG. 7 shows an example of rounding (in FIG. 7, the member grid is omitted). The ends of the mesh member having a predetermined length are overlapped and fixed. The fixing means may be a tape material or an adhesive, but it is preferable to apply welding, rivets, bolts, or the like depending on the high pressure of resin sealing, thermal expansion during heating, and the like. In the figure, an example is shown in which rivets are applied to both ends and the center of the overlapped portion in the axial direction.

FIG. 8 shows an example of a member suitable for the shielding member 91. (A) is an example of a plain woven wire mesh obtained by knitting a conductive wire. (B) is an example of the punching metal which carried out the punching process of the electroconductive board | plate material. (C) is an example of an expanded metal obtained by processing a conductive plate material into a net shape. By configuring the shielding member 90 using these materials, the shielding member 90 provided with the communication hole 91 can be easily thinned, and the size of the rotating electrical machine can be reduced. At the same time, the material cost and processing cost of the shielding member 90 can be greatly reduced. In addition, it is possible to expect a merit of improving the degree of freedom of processing by applying to rotating electrical machines having different shapes by changing the cutting shape and rounding diameter of the same mesh material.

The shielding member 90 of the first embodiment functions as an electrostatic shielding material by setting the ground potential. For this reason, the reliable connection between the ground plane and the shielding member also greatly contributes to ensuring reliability.
In the second embodiment, an example of grounding the shielding member 90 of the first embodiment is shown. In addition, the same code | symbol is used about the same location as Example 1, and description is abbreviate | omitted.

FIG. 9 is an axial sectional perspective view showing the arrangement relationship of the stator 10, the housing 50, and the shielding member 90 before resin sealing. In the figure, reference numeral 93 denotes a conducting member, which has a function of electrically connecting a part of the shielding member 90 and a part of the housing 50 and grounding the shielding member 91. The conductive member 90 is disposed in a region between the coils of the adjacent core members 20 facing each other. For example, when the winding 22 is not wound near the base of the flange portion 24 of the bobbin 23, the conductive member 93 is disposed in a space between the winding 22 and the flange portion 24.

The conductive member 93 is preferably a member having mechanical flexibility, and is made of, for example, a metal wire member, a metal thin plate member, a wire member, or a wire, but is not limited thereto. The conducting member 93 is arranged over the radial direction of the motor 100. For example, it arrange | positions between the collar part 23 of the core member 10, and the coil | winding 22. In addition, it is preferable that the conductive member 93 is provided with an insulating member except for a connection portion between the shielding member 90 and the housing 50. In this embodiment, a vinyl wire is applied.

FIG. 10 shows a connection structure between the shielding member 90 and the conductive member 93. FIG. 10A shows a state in which the ground terminal 94 is installed on the shielding member 90. The shielding member 90 (communication hole / mesh etc. is not shown) is rounded and the overlapping ends are welded at three points. At this time, a plate-shaped grounding terminal 94 having a pilot hole 94a is sandwiched from one radial portion and integratedly connected to one welding portion (for example, any welding point at both ends in the axial direction). FIG. 10B shows an axial cross section of a connection example between the ground terminal 94 and the conductive member 93. A crimp terminal 95 having a pilot hole is connected to the axial center end of the conductive member 93. Furthermore, the conduction member 93 is electrically connected to the shielding member 90 by the blind rivet 96 using the prepared holes of the ground terminal 94 and the crimp terminal 95. The conductive member 93, the ground terminal 94, and the blind rivet 96 are molded with the resin 30.

In this way, the conductive member 93 maintains insulation from the surrounding windings 22 and electrically connects the shielding member 90 and the housing 50 securely. In addition, since the conductive member 90, the ground terminal 94, the crimp terminal 95, and the shielding member 90 have mechanical flexibility, the load applied to the connection points at both ends is reduced by the deformation of the sealing pressure of the resin 30 itself. can do. Thereby, the reliability with respect to the grounding of the shielding member 90 improves.

Furthermore, the flexibility of the conductive member 93 and the like can absorb the dimensional variations caused by the member dimensions and the assembly accuracy, thereby improving the assembly workability. Bridging rivets contribute to ensuring both connection strength and workability. Here, by connecting so that the flange portion of the blind rivet 96 is positioned on the inner diameter side of the shielding member 90, the protruding amount on the inner diameter side can be reduced. Thereby, the shielding member 90 can be prevented from being thickened, and the motor can be reduced in size, output, efficiency, and cost.

In addition, although the example which connected the other end of the vinyl wire 93 to the housing 50 was shown in this figure, the grounding surface which connects the shielding member 90 is the site | part dropped to the grounding potential when driving | operating as a rotary electric machine. If so, it may be connected to any location. For example, although not shown in the figure, it may be connected to a shielding material for shielding between the winding 22 and the rotor 40. Specifically, for example, it is a case where a metal plate-like member for shielding is installed on all or a part of the collar portion 24 and a grounding wire having the metal plate-like member or the like as a ground potential is secured. . Further, the communication hole 91 of the shielding member 90 may be directly used for connection with the conduction member 93. There are advantages in terms of processing and parts costs.

As described above, according to the first and second embodiments, the shielding member 90 (1) reliably reduces the axial voltage, (2) ensures the insulation distance between the shielding member 90 and the winding 22, and (3 ) Prevention of defects due to lack of the resin 30 can be realized. Further, downsizing, performance improvement, and reliability improvement can be achieved.

Further, the present invention is not limited to the above various examples, and various changes and substitutions can be made without departing from the spirit of the present invention. In the embodiment, an example of a double rotor type axial gap type permanent magnet synchronous motor has been described. However, other types of axial gap type permanent magnet synchronous motors may be used. Alternatively, a synchronous reluctance motor, a switched reluctance motor, an induction motor, or the like that does not include the permanent magnet 41 may be used. Furthermore, a generator may be used instead of a motor.

DESCRIPTION OF SYMBOLS 10 ... Stator, 20 ... Core member, 21 ... Core, 22 ... Winding, 23 ... Bobbin, 24 ... Gutter part, 24a ... Axis direction front-end | tip part, 25 ... Cylindrical part, 30 ... Resin, 40 ... Rotor, 41 ... permanent magnet, 42 ... back yoke, 43 ... yoke, 50 ... housing, 60 ... end bracket, 70 ... shaft, 80 ... bearing, 90 ... shielding member, 91 ... communication hole, 93 ... conducting member, 94 ... ground terminal, 94a ... pilot hole, 95 ... crimp terminal, 96 ... blind rivet, 100 ... motor, 200 ... core member, 201 ... lower mold, 202 ... core, 210 ... core, 220 ... winding, 230 ... bobbin, A ... rotating shaft, X: shielding member

Claims

A plurality of core members each having a stator core around which windings are wound in a circumferential direction are arranged annularly around a rotation axis, and a stator integrally molded with resin, and a magnetic flux surface of the stator and rotation An axial gap type rotating electrical machine having a rotor facing through a gap in the axial direction, and a rotating shaft that rotates together with the rotor and passes through a rotation axis of the stator,
The stator is
It has a cylindrical shape along the outer peripheral shape of the rotating shaft, and has a shielding member that electrically shields the winding and the radially opposed portion of the rotating shaft,
The shielding member is
On the entire circumferential surface sandwiched between the winding and the rotationally opposed portion of the rotary shaft, a plurality of communication holes penetrating in the radial direction are provided with a constant density,
An area ratio of the plurality of communication holes occupying the entire circumferential surface is larger than an area ratio of a portion other than the plurality of communication holes, and at least a part of the shielding member is connected to the outside through the communication holes. An axial gap type rotating electrical machine in which the resin is filled from the diameter side to the inner diameter side.
The axial gap type rotating electrical machine according to claim 1,
An axial gap type rotating electrical machine in which the circumferential direction or the rotation axis direction length of the plurality of communication holes is larger than the thickness of the shielding member.
A plurality of core members having a stator core around which windings are wound in a circumferential direction are arranged in an annular shape around a rotation axis, and are integrally molded with a resin, and a magnetic flux surface of the stator An axial gap type rotating electrical machine having a rotor facing through a gap in a rotation axis direction, and a rotation shaft that rotates together with the rotor and passes through a rotation axis of the stator,
The stator is
It has a cylindrical shape that extends along the outer peripheral shape of the shaft, and has a shielding member that electrically shields a radial facing portion between the winding and the rotating shaft,
The shielding member is
An axial gap type rotating electric machine comprising a mesh member, wherein at least a part of the shielding member is filled with the resin from the outer diameter side to the inner diameter side through the mesh of the mesh member.
An axial gap type rotating electrical machine according to claim 3,
An axial gap type rotating electrical machine in which the mesh member has a mesh area larger than the lattice area.
An axial gap type rotating electrical machine according to claim 3,
An axial gap type rotating electrical machine in which the mesh of the mesh member has a constant density.
An axial gap type rotating electrical machine according to claim 1 or 3,
An axial gap type rotating electrical machine in which the shielding member is made of a metal net, punching metal, or expanded metal.
An axial gap type rotating electrical machine according to claim 1 or 3,
An axial gap type rotating electrical machine in which the shielding member is configured such that end portions of a sheet-like member having a predetermined length are coupled to each other along the outer peripheral shape of the rotating shaft.
An axial gap type rotating electrical machine according to claim 1 or 3,
An axial gap type rotating electrical machine in which the shielding member is configured such that end portions of a sheet-like member having a predetermined length are joined in the radial direction along the outer peripheral shape.
An axial gap type rotating electrical machine according to claim 1 or 3,
A conductive member that connects the shielding member and the inner periphery of the housing;
An axial gap type rotating electrical machine in which the conducting member is disposed in a region where the windings face each other between adjacent core members.
An axial gap type rotating electrical machine according to claim 1 or 3,
The shielding member further includes a ground terminal;
An axial gap type rotating electrical machine in which a conducting member that connects the ground terminal and the inner periphery of the housing is disposed in an area where the windings face each other between adjacent core members.
For rotating electrical machines in which windings are wound in the circumferential direction and a plurality of core members having a stator core that generates magnetic flux in the direction of the rotation axis are arranged in an annular shape around the rotation axis and become an integral annular body molded with resin A stator,
The stator is
A through hole for inserting the rotation shaft,
It has a cylindrical shape along the outer peripheral shape of the rotating shaft, and has a shielding member that electrically shields the winding and a radially opposing portion of the rotating shaft,
The shielding member is
On the entire circumferential surface sandwiched between the winding and the rotationally opposed portion of the rotating shaft, a plurality of communication holes penetrating in the radial direction have a constant density,
An area ratio of the plurality of communication holes occupying the entire circumferential surface is larger than an area ratio of a portion other than the plurality of communication holes, and at least a part of the shielding member is connected to the outside through the communication holes. A stator for a rotating electrical machine in which the resin is filled from the diameter side to the inner diameter side.
The stator for a rotating electric machine according to claim 11,
A stator for a rotating electrical machine, wherein a length in a circumferential direction or a rotation axis direction of the plurality of communication holes is larger than a thickness of the shielding member.
The stator for a rotating electric machine according to claim 11,
A stator for a rotating electrical machine, wherein the shielding member is made of a metal net, punching metal, or expanded metal.
The stator for a rotating electric machine according to claim 11,
An axial gap type rotating electrical machine in which the shielding member is configured such that end portions of a sheet-like member having a predetermined length are coupled to each other along the outer peripheral shape of the rotating shaft.
The stator for a rotating electric machine according to claim 14,
A stator for a rotating electrical machine in which one end portion is connected to the shielding member and the other end portion is disposed toward an outer periphery of the stator from a region between windings facing each other at the adjacent core member.