WO2017022044A1

WO2017022044A1 - Power transmission device

Info

Publication number: WO2017022044A1
Application number: PCT/JP2015/071902
Authority: WO
Inventors: 則久岩崎; 正木　良三; 榎本　裕治; 卓男王
Original assignee: 株式会社日立産機システム
Priority date: 2015-08-03
Filing date: 2015-08-03
Publication date: 2017-02-09

Abstract

Provided is a technique contributing to increasing the efficiency of power transmission and reducing the size of a device, without being affected by an environment under which a load is installed. A power transmission device has: an axial gap type rotating electric machine having a stator and a rotor, said stator having coils on the radial direction outer perimeter side of teeth that extend in a rotational axis direction and generating a magnetic flux from end surfaces of the teeth in the rotational axis direction, said rotor having a plurality of magnets that have different polarities and are disposed in a ring shape, and having a surface facing the end surfaces of the teeth with a predetermined gap interposed therebetween; a housing having a space for storing the stator and the rotor; a partition wall for dividing the region storing the stator and the rotor in the housing into discontinuous spaces; a bearing disposed on the partition wall and rotatably supporting the rotor; and a load device disposed on the rotor on the opposite side to the stator in the axial direction and rotating together with the rotor.

Description

Power transmission device

The present invention relates to a power transmission device, and relates to a power transmission device using an axial gap type rotating electrical machine.

As energy conservation and electrification in the field of transportation equipment are progressing, it is an urgent task to reduce the size and increase the efficiency of rotating electrical machines (motors, generators, etc.). In general, compactness and high efficiency are contradictory elements, but how high compatibility can be achieved has become a challenge in recent years. Against this background, attention is increasing to an axial gap type rotating electrical machine that can be expected to have a large torque in a compact and space-saving manner.

¡Axial gap type rotating electrical machines can be used as a motor that can easily generate torque as the radial cross-sectional area increases, and the shape can be flattened. In such a flat structure, the larger the moment of inertia, the more advantageous the output torque. Therefore, the structure and characteristics of the axial gap type rotating electrical machine can be utilized and applied to various applications.

・ Fly foil may be applied as an example of application. Patent document 1 discloses the technique of a flywheel. Flywheels have a mechanism for storing energy using inertial forces, but losses such as mechanical loss and windage loss of a rotating disk are harmful to energy storage. Patent Document 1 discloses a technique for reducing windage loss even in a non-closed space by digging a spiral groove in a flywheel disk and urging the air flow backward in the rotational direction.

Also, as an example of another application, there is a fluid pump apparatus using an impeller. High torque of axial gap type rotating electrical machines. It is suitable for the case where the pump mechanism itself is downsized by utilizing the characteristics such as the flat structure.

JP 2003-206992 A

Here, let us consider the means for transmitting power from the power drive means to the application device. In many cases, the rotating electrical machine is mechanically connected to a load (such as a flywheel or an impeller) of an application device to which the rotating electrical machine is applied through a shaft that rotates together with the rotor. When the load layout environment requires closeness, it is necessary to partition the rotating electrical machine and the load storage area with a partition wall, etc., and to provide a shaft penetration part in the partition wall. This causes a problem that mechanical loss occurs due to friction with the airtight holding member.

For this, it can be solved by arranging the rotating electrical machine and the load in the same space of the housing in which the airtightness is maintained, but there is a problem that the construction of the airtightness becomes complicated due to the increase in the size of the space, and the device The challenge of increasing the overall size also invites.

Even if the rotating electrical machine and the load are arranged in the same space where airtightness is maintained, for example, when the application device is a pump device that transports liquid or the like, the armature of the rotating electrical machine is maintained. There is a problem that a configuration is required and the configuration is complicated and the size of the apparatus is increased.
A technology that contributes to the efficiency of power transmission and the miniaturization of the apparatus without being affected by the environment in which the load is installed is desired.

In order to solve the above problems, for example, the configuration described in the claims is applied. That is, a coil is provided on the radially outer peripheral side of the tooth extending in the rotation axis direction, a stator that generates a magnetic flux in the rotation axis direction from the tooth end surface, and a plurality of magnets having different magnetic poles are annularly arranged, and the teeth end surface An axial gap type rotating electrical machine having a rotor facing the surface through a predetermined gap, a casing having a space for storing the stator and the rotor, and a storage area of each of the stator and the rotor in the casing being discontinuous. Power having a partition partitioning as a space, a bearing disposed on the partition and rotatably supporting the rotor, and a load device disposed on the opposite side of the stator in the axial direction and rotating together with the rotor It is a transmission device.

Further, a stator having a coil on the radially outer peripheral side of the teeth, generating a magnetic flux in the direction of the rotation axis from the tooth end surface, and a plurality of magnets having different magnetic poles are arranged in an annular shape, and a predetermined gap is provided between the tooth end surface and a predetermined gap. A power transmission device comprising an axial gap type rotating electrical machine having a rotor facing the surface, wherein the stator is molded on the outer surface with a resin, the stator after the resin molding, the rotor, Is disposed in the rotational axis direction via a bearing, and the rotor includes a load device that is disposed on the opposite side of the stator in the axial direction and rotates together with the rotor. The stator, the rotor, and the load device It is a power transmission device provided with the housing | casing which has the inner space which stores in the same storage area.

According to the present invention, power transmission can be made efficient without being affected by the load arrangement environment. Moreover, the apparatus can be reduced in size.
Further problems, configurations, and effects solved by the present invention will become apparent from the following description.

It is an axial direction longitudinal cross-sectional view which shows the structure of the power transmission device by Example 1 to which this invention is applied. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a developed perspective view schematically showing a configuration of an axial gap type rotating electrical machine according to a first embodiment. It is an axial direction longitudinal cross-sectional view which shows the structure of the electric pump apparatus by Example 2 to which this invention is applied. FIG. 6 is a developed perspective view schematically showing configurations of an axial gap type rotating electric machine and an impeller according to Embodiment 2. FIG. 10 is a developed perspective view illustrating the configuration of an axial gap type rotating electrical machine and an impeller according to a modification of the second embodiment. FIG. 10 is a perspective view schematically showing a configuration of a magnet according to a modified example of Example 2. It is an axial direction longitudinal cross-sectional view which shows the structure of the electric pump apparatus by Example 3 to which this invention is applied. It is an axial direction longitudinal cross-sectional view which shows the structure of the electric pump apparatus by Example 4 to which this invention is applied. FIG. 10 is a developed perspective view schematically showing configurations of an axial gap type rotating electric machine and an impeller according to a fourth embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view in the axial direction of a power transmission device 1 according to a first embodiment to which the present invention is applied. The power transmission device 1 includes a stator 2, a rotor 3, a shaft 4, and a bearing 7, and includes a stator case 5 and a load-side case 6 as a casing for storing these in an internal space. The power transmission device 1 uses an axial gap type rotating electrical machine as the rotating electrical machine.

The stator 2 is formed of an annular body in which a plurality of teeth extend in the rotation axis direction, and is installed in the stator case 5. The stator case 5 has a cylindrical shape with one axial opening, and has an inner cylinder portion 5 a as a storage area for the stator 2. A flange portion 5b extending along the outer periphery in the radial direction is formed in the vicinity of the opening end edge of the stator case 5. The length in the rotation axis direction of the stator 2 is smaller than the length from the bottom surface in the axial direction of the inner cylinder portion 5a to the intersection with the extension line in the axial direction of the flange portion 5b. When it is installed, the load side end face of the stator 2 is arranged so as not to exceed the extension line.

The load-side case 6 has a flat surface portion 6a on one end face in the axial direction and an outer peripheral wall portion 6b on the radially outer side, and a hollow portion 6c for installing the rotor 3 and the like together with the flat surface portion 6. It is. In the present embodiment, the stator 2 and the rotor 3 are configured to be installed in another space that is discontinuously partitioned by a partition wall called a flat portion 6a. The diameter of the flat portion 6a is larger than the diameter of the flange portion 5b. Stator case 5 is connected to flat surface portion 6a via bolt 8 at flange portion 5b. On the opposite side of the load side case 6 in the axial direction, other partition walls or the like (not shown) are arranged, and the hollow portion 6c is a closed space in which airtightness is ensured (including vacuum). A cylindrical recess 6d is formed in the center of the bottom surface of the stator 2 side in the axial direction of the hollow portion 6c (the back surface side of the flat surface portion 6a), and a radial bearing 7 (ball, roller, needle, etc.) is interposed in the recess 6d. The rotor 3 is arranged. More specifically, the inner peripheral surface of the recess 6d and the outer ring of the radial bearing 7 are connected, and the inner ring of the radial bearing and the outer peripheral surface of the rotor 3 are connected. Further, the magnet surface of the rotor 3 and the bottom surface of the recess 6d are not in contact with each other.

Note that the present invention is not necessarily limited to a closed space, and the other side of the hollow portion 6c of the load-side casing 6 communicates with the outside in accordance with the specification of the application to which the application is applied (the flywheel 9 in this embodiment). It may be a configuration.

The rotor 3 has a magnet 31 and a yoke 32. The magnet 31 has an annular shape as will be described later, and one end surface in the axial direction is supported by the yoke 32 by adhesion, fitting, or the like. The shaft 4 is connected so as to rotate together with the center of the yoke 32, and is connected to the flywheel 9 at the end opposite to the yoke 32.

FIG. 2 shows a developed perspective view of the axial gap type rotating electrical machine 10.
As shown in FIG. 1A, the axial gap rotating electrical machine 10 includes a core 21, a coil 22, a magnet 31, and a yoke 32. The stator 2 includes a core 21 and a coil 22 that is wound around a radially outer periphery of teeth formed on the core 21.

The core 21 is made of a soft magnetic material such as an electromagnetic steel plate, a powder magnetic core, an amorphous metal, or permendur. Except in the case of applying a powder magnetic core, in order to suppress the eddy current of the core, it is preferable to laminate in the circumferential direction or the radial direction. In the case of a powder magnetic core, the magnetic core that constitutes the core is electrically insulated, which increases the electrical resistance of the core, so that lamination is not necessary. Usually, a rotating electrical machine such as a motor is a radial gap type composed of a rotor supported rotatably in a circumferential direction and a stator arranged via a gap in a radial direction for generating torque. The magnetic flux is mainly in the radial direction. Therefore, in order to reduce the eddy current of the core, most of the stators are laminated with steel plates in the axial direction. In the case of an axial gap type rotating electrical machine, the magnetic flux is mainly in the axial direction, and in order to reduce eddy currents in the in-plane direction, electrical insulation is performed in a direction perpendicular to the flow of magnetic flux in the radial direction and circumferential direction. Necessary. Insulating methods include insulating paper, resin bobbins, insulating agents, and the like.

In the present embodiment, the core 21 is obtained by winding a foil strip made of amorphous metal in a roll shape around the rotation axis to obtain an annular body, and then cutting and cutting one axial portion radially from the axis. Thus, a tooth portion protruding in the axial direction is obtained. Further, the portion other than the teeth functions as a yoke. In addition, the manufacturing method of the core 21 is not restricted to this.

The coil 22 is made of a conductive member such as copper or aluminum, and is wound around the radially outer periphery of the teeth of the core 21. Further, an insulator such as insulating paper or a bobbin is inserted between the tooth portion of the core 21 and the coil.

The magnet 31 is made of a permanent magnet such as a neodymium sintered magnet, a ferrite magnet, or a bonded magnet. FIG. 2B shows a perspective view of the magnet 31. The magnet 31 has a configuration in which the magnetic poles are sectioned in a sector shape radially from the axial center. In this example, there are 8 poles, and the magnetic poles adjacent to each other in the rotation direction are different from each other in the axial direction.

The rotor 3 is opposed to the core 21 and the flat portion 6a of the load-side casing 6 in the rotation axis direction through a gap (see FIG. 1). In this case, similarly to the core 21, a change in the magnetic flux is directly received, and there may be a phenomenon in which an eddy current flows so that the magnetic flux is generated in a direction to prevent the change. When a neodymium sintered magnet is applied, the neodymium sintered magnet has a large energy product and a large torque can be expected, but on the other hand, it has a characteristic that electric resistance is low and eddy current flows easily. Therefore, when using neodymium magnet sintering, it is preferable to divide the magnet in a direction perpendicular to the axis to provide electrical insulation. Alternatively, the magnet 31 may be embedded in the yoke 32 to take measures such as reducing the influence of changes in magnetic flux.

On the other hand, when a ferrite magnet is applied to the magnet 31, there is an advantage that electric resistance is high and eddy currents hardly flow. Therefore, measures such as magnet division and embedding in the yoke 32 are not required. Moreover, since the ferrite magnet is made of iron oxide, a rust prevention effect can be expected. In terms of rust prevention, it is also preferable to use a bonded magnet. NdFeB-based or SmFeN bonded magnets have a high residual magnetic flux density and can be expected to have a high output.

The yoke 32 is made of a soft magnetic material such as an electromagnetic steel plate, a powder magnetic core, an amorphous metal, or permendur, similarly to the core 21 of the stator. The yoke 32 also changes in magnetic flux when the motor is driven. However, since the influence of the eddy current is relatively smaller than that of the core 21, the yoke 32 may be configured as an integral iron member. In order to suppress the eddy current loss as much as possible, it is preferable to apply a magnetic powder core or to laminate a thin plate material such as an electromagnetic steel plate, an amorphous metal, or permendur. The yoke 32 has a shaft 4 connected to the flywheel 9 in the center of the stator 2 and the end surface opposite to the axial direction.

The axial gap type rotating electrical machine 10 configured as described above is arranged in the stator case 5 or the load side case 6 as shown in FIG. 1 and a current is applied to the stator 2 so that the rotor 3 and the flywheel 9 rotate. Doing exercise. Specifically, the magnetic flux that flows from the stator 2 through the hollow portion 6a and the pole of the magnet 31 are repeatedly attracted and repelled, and the rotor 2 and the flywheel 9 are rotated.

According to the power transmission device 1 having the above configuration, the stator 2 side and the rotor 3 side can be spatially separated. In other words, the flywheel 9 supported by the shaft 4 on the rotor 3 side is driven in the hollow portion 6c in which the surrounding environment is maintained under a certain pressure, thereby reducing windage loss and storing energy of the flywheel. Can be advantageous.

Further, the rotor 3 can be installed without penetrating the flat portion 6a of the load side case 6, and a seal applied to the penetrating portion or the like becomes unnecessary, and there is an effect of reducing mechanical loss.

Furthermore, the use of an axial gap type rotating electric machine having flatness contributes to the miniaturization of the apparatus.

Embodiment 2 to which the present invention is applied will be described. The second embodiment is an example in which an impeller (impeller) 51 is applied as a load device in place of the flywheel 9 of the first embodiment, and the electric pump device 11 is applied as a power transmission device. Hereinafter, the electric pump device 11 will be described in detail. In addition, the same member as another Example shall attach | subject the same code | symbol, and detailed description may be abbreviate | omitted.

FIG. 3 shows a longitudinal sectional view of the electric pump device 11 in the axial direction. The stator 2 and the stator case 5 are the same as those in the first embodiment. Similarly, the storage area of the stator 2 and the rotor 3 is discontinuously partitioned by the flat portion 6 a of the load side case 6. The electric pump device 50 transports a liquid as a transport fluid. For this reason, the rotor 3 side of the load side case 6 shall be the area | region closed with respect to the stator 2 and other external space.

The rotor 3 has an impeller 51 that is integrally connected to an end surface on the opposite side to the stator 2 in the axial direction. The radial bearing 7 is a sealed bearing, and prevents liquid from entering the gap between the axial bottom surface of the recess 6 d and the rotor 3. Since the resistance of the rotating body in the liquid becomes disadvantageous as the diameter increases, the resistance applied to the rotor 3 is reduced by preventing the liquid from entering the gap, thereby improving the efficiency.

FIG. 4 shows an exploded perspective view of the armature and impeller 51 of the axial gap type rotating electric machine 10. The impeller 51 is an impeller that sends out a conveying pressure that circulates liquid by rotation, and is made of a material such as resin. The impeller 51 has an annular protrusion 51a having an inner diameter substantially the same as the outer diameter of the yoke 32 in the axial direction from the edge on the yoke 32 side. The annular protrusion 51a extends to the same extent as the axial width of the yoke 32 and the magnet 31, and covers the peripheral surfaces of both with the inner diameter.

Since the magnet 31, the yoke 32, and the impeller 51 are immersed in the liquid, for example, when the liquid is water or the like, the magnet 31 or the yoke 32 is subjected to a rust prevention treatment. When applying a ferrite magnet mainly composed of iron oxide or a bond magnet having strong rust resistance, a rust prevention treatment is not essential, but when applying a ferrite magnet, it is preferable to carry out a rust prevention treatment. The same applies to the yoke 32. For example, when martensitic magnetic stainless steel such as SUS440c is applied, rust prevention treatment is unnecessary, but it is preferable to carry out rust prevention treatment for iron or the like. In the present embodiment, the configuration in which the annular protrusion 51a covers the circumferential surfaces of the yoke 32 and the magnet 31 also helps to prevent rust.

According to the electric pump device 10 of the second embodiment, it is not necessary to pass through the flat portion 6a that divides the stator 2 and the rotor, the mechanical loss due to the seal or the like is reduced, and the device is downsized by simplifying the configuration. Can be achieved. In particular, in the relationship with the liquid, leakage to the stator 2 side is eliminated, and the reliability as the apparatus is improved.

[Modification]
The impeller 51 according to the second embodiment has a configuration in which the annular protrusion 51a covers the circumferential surfaces of the magnet 31 and the yoke 32 on the inner diameter side, but may have a configuration in which the yoke 32 is not used.
FIG. 5 shows an example in which the modified impeller 51 is applied. FIG. 5A shows an example in which a flat surface 51b is formed in the magnet direction without providing the annular protrusion 51a on the impeller 51, and the end surface of the magnet 31 is bonded with an adhesive or the like. By bonding the flat surface 51b and the end surface of the magnet 31, the strength of the magnet 31 is ensured, and since there is no yoke 32, the axial size can be reduced and the rotor 3 can be reduced in weight.

FIG. 5B shows an annular protrusion 51c in which the axial width of the annular protrusion 51a of the impeller 51 is equal to the axial width of the magnet 31, and the magnet 31 is fitted on the inner diameter side and bonded with an adhesive or the like. It is a structural example. The magnet 31 has a sufficient strength because the peripheral surface is supported by the annular protrusion 51a. Since the yoke 32 is not used, it contributes to reduction in axial size and weight of the rotor 3.

In addition, as shown in FIG. 6, it is preferable that the magnet 31 used in such a modification is polar anisotropic magnetization in which N-pole magnetic flux is concentrated in the axial direction. Since a bonded magnet can be relatively freely oriented, such polar anisotropic magnetization is possible. By having such a magnetic flux direction, there is no leakage of magnetic flux in the direction opposite to the N pole, so that it is not necessary to provide the yoke 32. Use of a bonded magnet is also preferable from the viewpoint of rust prevention.

Embodiment 3 to which the present invention is applied will be described. The third embodiment is another configuration example when applied to the electric pump device 10 as a power transmission device. The main difference from the electric pump device of the second embodiment is that the stator 2 and the rotor 3 are arranged in the internal space of the stator case 5 and the load side case 6, but the partition wall that divides both is a load side case 6, instead of the flat portion 6 a, the inner stator case 60 is a member independent of the stator case 5 and the load side case 6. Another difference is that a thrust bearing 65 is applied as a bearing that rotatably supports the rotor 3.

FIG. 7 shows a sectional view in the axial direction of the electric pump device according to the third embodiment. The electric pump device 11 includes a stator case 5 and a load side casing 6. The stator case 5 is open at one end in the axial direction, and the load-side case 6 is also open at one end in the axial direction so that both open end sections having the same inner and outer diameters are joined to each other. Depending on the specifications, the stator case 5 and the load-side case 6 may not be divided.

The inner stator case 60 has an outer peripheral surface that is approximately the same diameter as or slightly smaller than the inner diameter of the stator case 5, and has a circular cylindrical shape that opens only on the stator 2 side. In addition, the bottom surface of the inner stator case 60 has a concavo-convex shape along the shape of the teeth and coil portions of the stator 2 and is configured to cover the stator 2 from the axial direction along the shape. An insulating material is applied between the stator 2 and the inner stator case 60 to be electrically insulated. As the insulating material, for example, insulating paper or an insulating agent may be applied, or resin sealing may be used.

After the stator 2 is arranged in the inner stator case 60, the opening side (the arrangement side of the stator 2) of the inner stator case 60 is fitted into the inner cylindrical portion 5a of the stator case 5. In order to ensure airtightness, the outer peripheral surface of the inner stator case 60 and the inner cylindrical portion of the stator case 5 may be configured to be fitted with no gap. In addition, it is also preferable to use a sealing agent as needed. Further, the stator 2 may be sandwiched and fixed between the inner cylindrical portions of the stator casing 5 by using the fitting force.

On the other hand, one race of the thrust bearing 65 is fixed to the end surface of the recess of the inner stator case 60 along the teeth and the coil shape of the stator 2, and the impeller 51 is mounted to the other race. The rotor 3 is fixed. The rotor 3 and the impeller 51 may have any configuration of the second embodiment (FIG. 4) and its modification (FIG. 5). Finally, the end sections of the stator case 5 and the load side case 6 are screwed together. By being fixed by, etc., a sealed structure in which the stator 2 side and the rotor 3 side are partitioned can be obtained.

As described above, according to the electric pump device 10 of the third embodiment, there is no opportunity loss due to the through-shaft and the seal applied to the inner stator case 60 as the partition wall. Moreover, the effect that the apparatus is reduced in size can be obtained.

In particular, in the third embodiment, since the thrust bearing 65 is applied, there is an effect that if the joining portion with the inner stator case 6 is secured at least for the thickness of one race, the shaft can be shortened for the other race side. .

Embodiment 4 to which the present invention is applied will be described. The fourth embodiment is another configuration example when the power transmission device is applied to the electric pump device 11 as in the second and third embodiments. The difference between the other examples and the fourth example is that there is no partition wall that partitions the storage area between the stator 2 and the rotor 3 by molding the outer surface of the stator 2 with resin. In other words, it can be said that the resin-mold functions as a partition wall.

FIG. 8 is a sectional view in the axial direction of the electric pump device according to the fourth embodiment. This example is based on the configuration of the third embodiment, and has a configuration in which the stator 2 and the rotor 3 are arranged in the axial direction through the thrust bearing 65 in the inner cylindrical space of the stator case 5 and the load side case 6.

The outer surface of the stator 2 around which the coil is wound around the core 22 is molded with the resin 100. Further, the outer peripheral side of the coil 22 is molded with a predetermined thickness, and after molding, the outer diameter is approximately the same as or slightly smaller than the inner cylinder portion 5a of the stator case 5. This is for securing the fitting property between the stator 2 and the stator case 5 and ensuring insulation. Further, by molding the outer surface of the stator 2 with resin, the rust prevention property of the stator 2 can be secured.

The stator 2 is fixed by the resin-molded stator 2 being fitted into the inner cylinder portion of the stator case 5 from the axial direction. The stator 5 may be positioned and arranged on the inner cylinder portion of the stator case 5 and resin molded. Further fixing of the stator 2 and the stator case 5 can be expected.

The rotor 3 is connected to the stator 2 via a thrust bearing 65. In this embodiment, a bearing holding member 70 is arranged between the resin-molded stator 2 and the thrust bearing 65. Yes.

FIG. 9 schematically shows a developed perspective view of the armature, the bearing holding member 70, the thrust bearing 65, and the rotor 3. The bearing holding member 70 is made of metal, resin, or the like, and has an annular main body portion 70a that holds one race outer peripheral corner portion of the thrust bearing 65 from the axial direction and the radial direction, and a plurality of radially extending radial portions from the main body portion 70a. Extending portion 70b. If the thrust bearing 65 is disposed directly on the resin mold portion of the stator 2, the resin may be damaged by the rotational stress of the rotor 3. For this reason, the thrust bearing 65 is fixed to the stator 2 via the bearing holding member 70.

The main body 70a has an inner diameter that can sufficiently fix the outer peripheral angle of the race when the one race of the thrust bearing 65 is fitted. The extending portion 70b has a width in the rotational direction that is smaller than the width between the stator teeth and has a length in the radial direction that covers the axial end surface side of the coil 22, and is not covered by the resin or the coil. It is arranged in contact. The extending portion 70b exerts stress against a rotational load applied to the main body portion 70a. In addition, the radial direction length of the extending | stretching part 70b is arbitrary.

The magnet 31 side of the impeller 51 is based on a flat surface, and has an annular protrusion 51d in the axial direction that is approximately the same diameter or slightly smaller in diameter than the inner circumference of the annular magnet 31. This is for ensuring workability and securing when assembling the impeller 51 to the magnet 31. Moreover, the planar outer peripheral side of the impeller 51 has an annular protrusion 51c as in the second embodiment.

As described above, according to the electric pump device 11 of the fourth embodiment, there is no through shaft and its seal, and the opportunity loss is reduced accordingly. Further, there is no partition wall (planar portion 6a, inner stator case 60, etc.) that divides the space for installing the stator 2 and the rotor 3 (or because the resin mold performs its function), and the size and shaft are further reduced accordingly. Can be shortened.
Further, the outer surface of the stator 2 is resin-molded to ensure rust prevention.

As mentioned above, although the embodiment which implements this invention was demonstrated, this invention is not limited to the said example, A various combination and a change are possible in the range which does not deviate from the meaning. For example, the load of the rotor 3 is not limited to the flywheel 9 and the impeller 51, and may be a fan or another application. Similarly, the transport body of the electric pump device 11 may not be a fluid but may be a gas or powder.

Power transmission device ... 1, stator ... 2, rotor ... 3, shaft ... 4, stator case ... 5, inner cylinder part ... 5a, flange part ... 5b, load side case ... 6, plane part ... 6a, outer peripheral partition wall ... 6b, Recess ... 6d, radial bearing ... 7, bolt ... 8, flywheel ... 9, electric pump device ... 11, core ... 21, coil ... 22, magnet ... 31, yoke ... 32, impeller ... 51, flat part ... 51b, annular Projection ... 51c, annular projection ... 51d, inner stator case ... 60, thrust bearing ... 65, bearing holding member ... 70, main body ... 70a, extension ... 70b, resin ... 100

Claims

A stator having a coil on the radially outer peripheral side of the tooth extending in the rotation axis direction, and generating a magnetic flux in the rotation axis direction from the tooth end surface, and a plurality of magnets having different magnetic poles are arranged in an annular shape. An axial gap type rotating electrical machine having a rotor facing the surface through the gap;
A housing having a space for housing the stator and the rotor;
A partition that partitions the storage area of the stator and the rotor as a discontinuous space in the housing,
A bearing disposed on the partition wall and rotatably supporting the rotor;
A power transmission device comprising: a load device that is arranged on the opposite side of the stator in the axial direction with respect to the rotor and rotates together with the rotor.
The power transmission device according to claim 1,
The power transmission device, wherein a storage area of the rotor defined by the partition in the housing is a space sealed from the outside.
The power transmission device according to claim 1,
The power transmission device, wherein the housing is divided into a stator housing having a region for storing the stator and a load side housing having a region for storing the rotor and the load device.
The power transmission device according to claim 1,
A power transmission device in which the magnet is magnetized anisotropically in the direction of the rotation axis.
The power transmission device according to claim 1,
The rotor has a shaft extending in the rotation axis direction from the end surface opposite to the stator;
A power transmission device in which the load device is disposed on the shaft.
The power transmission device according to claim 1,
The power transmission device, wherein the rotor integrally arranges the load device on an end surface opposite to the stator.
The power transmission device according to claim 1,
The bearing is a radial bearing;
A power transmission device disposed between an outer periphery of the rotor and the partition.
The power transmission device according to claim 1,
The bearing is a thrust bearing;
A power transmission device disposed between the rotor and the partition wall.
A power transmission device according to any one of claims 5 to 8,
A power transmission device in which the load device is a flywheel.
A power transmission device according to any one of claims 5 to 8,
A power transmission device in which the load device is an impeller.
The power transmission device according to claim 2,
The load device is an impeller;
A power transmission device in which a liquid circulates in a storage area of the rotor.
A stator having a coil on the radially outer peripheral side of the tooth and generating a magnetic flux in the direction of the rotation axis from the tooth end surface, and a plurality of magnets having different magnetic poles are arranged in an annular shape, and face each other with a predetermined gap from the tooth end surface A power transmission device comprising an axial gap type rotating electrical machine having a rotor that
The stator is one whose outer surface is molded with resin,
The stator after the resin molding and the rotor are arranged in a rotation axis direction via a bearing,
The rotor has a load device that is arranged on the opposite side of the stator in the axial direction and rotates together with the rotor,
A power transmission device comprising a housing having an inner space for storing the stator, the rotor, and the load device in the same storage area.
The power transmission device according to claim 12,
A power transmission device in which a bearing holding member for holding a connection state between the stator and the bearing is disposed between the stator and the bearing.
The power transmission device according to claim 12,
The inner space of the housing is closed from the outside, and is a space in which liquid flows.
A power transmission device, wherein the load device is an impeller that conveys the liquid by rotation.
The power transmission device according to any one of claims 12 to 14,
A power transmission device in which the bearing is a thrust bearing.