JP7233451B2 - Axial gap type rotary electric machine - Google Patents

Description

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

An axial gap type rotary electric machine is known. For example, an axial gap type rotary electric machine has a structure in which a pair of disk-shaped rotors are arranged to face each other in the direction of the rotation axis, and a stator is sandwiched between the pair of rotors with a predetermined gap in the axial direction. There is a 2-rotor-1-stator type axial gap type rotary electric machine. The rotor is composed of a back yoke as a base and a plurality of magnets arranged in the rotational direction, and the stator is composed of a plurality of core units arranged in the rotational direction with the magnetic flux surface as the axial direction. .

In some axial gap type rotating electric machines, the stator is integrally molded with the inner periphery of the housing with resin to improve insulation and durability and to ensure fixation of the stator within the housing. Patent Document 1 discloses an axial gap type rotary electric machine, which includes spiral projections and a plurality of locking projections arranged at predetermined intervals in a rotational direction on the inner periphery of a housing, and a plurality of stator cores on the axial side. Disclosed is an axial gap type rotary electric machine provided with a resin-molded stator arranged annularly along the inner circumference of a housing and integrated with the housing by encapsulating resin into the housing and the stator. In Patent Document 1, the stator can be more securely fixed in the housing by the projections and locking projections.

International Publication WO2013/121590

Axial gap type rotary electric machines have the advantage of being able to achieve high efficiency because they can have a shorter shaft (flat structure) and a larger opposing area of the stator and rotor per body size. In maximizing these advantages, it is important to manage a narrow gap between the stator and rotor and ensure airtightness between components.

When the stator is molded together with a housing such as a housing, the resin may leak to the rotor through a gap between the resin mold and the inner periphery of the housing. In particular, there is a tendency that the sealing pressure of the resin tends to be high due to the demand for insulation and stable installation of the stator, which may promote resin leakage.

If the resin that has leaked into the inner circumference of the housing is left unattended, there is a risk that it will peel off due to vibration during rotational driving, aging, and the like. If the peeled resin piece enters the gap, it may cause damage to the magnetic flux surface or the magnet surface, or may affect other driving parts, etc., and problems remain in terms of performance and reliability.

On the other hand, even if the leaked resin is removed after the resin mold is removed after encapsulating the resin, there are maintenance issues such as damage to the inner periphery of the housing and the stator surface due to such work, and the problem of reduced workability. remain.

There is a demand for a technique that can pursue the advantages in terms of performance, reliability, and workability while making full use of the advantages of the resin-molded stator.

In order to solve the above problems, for example, the configurations described in the claims are adopted. That is, a plurality of core units having a magnetic flux surface in the direction of the rotation axis are arranged in an annular shape around the rotation axis, a rotor axially facing the magnetic flux surface of the stator, and the stator are housed. A housing having an inner cylinder space and a housing that covers part or all of the stator and is enclosed in the stator and the inner circumference of the inner cylinder space to integrally connect the stator and the inner circumference of the inner cylinder space. In the axial gap type rotary electric machine having a mold resin, the housing has an annular thick portion along the inner circumference with a predetermined thickness toward the axial center in a part of the inner circumference of the inner cylindrical space. A boundary between the mold resin and an axial end of the inner circumference of the inner cylinder space coincides in the radial direction.

According to one aspect of the present invention, the risk of the mold resin peeling off toward the rotor is reduced, and there are effects of improving performance, reliability, durability, and workability.
Other problems, configurations, and effects of the present invention will become clear from the following description.

1 is an axial longitudinal sectional view schematically showing the configuration of an axial gap type motor according to Example 1 to which the present invention is applied; FIG. 3 is a perspective view schematically showing the external configuration of the core unit and stator of the axial gap type motor according to Example 1. FIG. FIG. 2 is a perspective view schematically showing the wire configuration of the axial gap type motor according to Example 1 and the arrangement configuration in the housing; 4 is a cross-sectional view schematically showing a resin molding process of the axial gap type motor according to Example 1. FIG. 4 is a schematic diagram showing the configuration of a resin mold and a seal member used in a resin molding process according to Example 1. FIG. 4 is a state transition diagram schematically showing deformation of a seal member in a resin molding process of the axial gap type motor according to Example 1. FIG. 3 is a longitudinal sectional view schematically showing the configuration of the axial gap type motor according to Example 1 after a resin molding process; FIG. FIG. 10 is a state transition diagram schematically showing deformation of a seal member in a resin molding process of an axial gap type motor according to Embodiment 2 to which the present invention is applied; FIG. 10 is a vertical cross-sectional view schematically showing the state of the axial gap type motor according to Example 2 after the resin molding process. FIG. 10 is a vertical cross-sectional view schematically showing the configuration of a thick portion, a seal member, and a resin mold of an axial gap type motor according to a modified example to which the present invention is applied; FIG. 5 is a longitudinal sectional view schematically showing the construction of a housing of an axial gap type motor according to a modified example to which the present invention is applied;

Hereinafter, an axial gap type electric motor (hereinafter sometimes simply referred to as "motor") 100, which is an embodiment to which the present invention is applied, will be described in detail with reference to the drawings. Although this embodiment uses a motor as an example, the present invention can also be applied to a generator.

FIG. 1 schematically shows a vertical cross-section of the motor 100 in the rotation axis direction. Motor 100 includes housing 1 , bracket 2 , bearing 3 , rotating shaft 4 , rotor 7 and stator 12 . A housing 1 is a motor housing, and is an example of a housing that houses a stator and the like. The housing 1 has a tubular shape and has an inner tubular space that contains the rotating shaft 4 , the rotor 7 and the stator 12 .

The rotor 7 has a disk-shaped back yoke 6 as a base, and a plurality of (permanent) magnets 5 are arranged on the surface of the back yoke 6 on the stator side. The magnets 5 have various shapes such as a trapezoidal shape and a fan shape, and are arranged annularly in the rotational direction around the rotating shaft 4 so that adjacent magnets 5 have different magnetic polarities. It should be noted that the magnet 5 may be a single ring-shaped body, and the adjacent poles may be different when magnetized.

The back yoke 6 has an axial through hole in the center and is fixed so as to rotate together with the rotating shaft 4 passing through the hole. Two rotors 7 are arranged so as to sandwich the stator 12 and the stator 12 in the axial direction with a predetermined gap therebetween. Although this embodiment exemplifies a so-called one-stator/two-rotor configuration, the present invention is not limited to the number of stators and rotors within the scope of the invention.

The rotating shaft 4 is rotatably supported by the bracket 2 at both ends in the extending direction via bearings 3 in the radial or thrust direction.

The stator 12 comprises a plurality of core units 12a having cores 8, coils 9, etc., arranged in a ring around the rotating shaft 4. As shown in FIG. Also, the stator 12 is a so-called molded stator having a mold resin 10 integrally covering the plurality of core units 12a. Even after the molding resin 10 is placed, the center of the stator 12 has a hole that passes through in the axial direction, and the rotary shaft 4 passes through this hole without contact.

The mold resin 10 also has the function of fixing the stator 12 to the housing 1 . The molding resin 10 is formed between a thick portion 13 and core units 12a, which are arranged on the inner periphery of a part of the housing 1 (to be described later), or between a plurality of core units 12a arranged in an annular shape, depending on the sealing pressure of an encapsulating device that encloses the resin. The stator 12 is integrally connected and fixed to the inner cylinder space of the housing 1 by wrapping around the gap. The mold resin 10 may cover the entire stator 12, or various mold modes may be applied, such as exposing a part of the core 8, such as the axial end face, without covering it.

FIG. 2 schematically shows the configuration of the core unit 12a and the stator 12. As shown in FIG.
FIG. 2(a) shows an external perspective view of the core unit 12a. The core unit 12 a has a core 8 , a bobbin 11 and a coil 9 . The core 8 can have various configurations such as a laminated core formed by laminating steel sheets or foils, a powder core, or a core formed by cutting, and has a substantially trapezoidal columnar shape. Note that the core may have a configuration other than a trapezoidal shape or a columnar shape. The bobbin 11 is an insulating member, and various configurations can be applied. A core 8 is arranged in the inner cylinder of the bobbin 11 and a coil 9 is wound around the outer cylinder of the bobbin 11 .

FIG. 2B shows an external perspective view of the stator 12 in which a plurality of core units 12a are annularly arranged. Each core unit 12a is annularly arranged with the upper base side of each core unit 12a having an approximately trapezoidal cross-sectional shape facing the rotating shaft 4 side, and is connected to the radial outer periphery of the end face on the load side and the anti-load side. It is fastened by the connecting member 14 which connects. In addition, in the present invention, the configuration of the stator is not limited to this example.

3 shows the stator 12 and how it is arranged in the housing 1. FIG. As shown in FIG. 3( a ), conductive wires (connecting wires) 30 drawn from each core unit 12 a are arranged along the inner peripheral surface of the housing 1 around the anti-load side of the stator 12 . In this embodiment, three conducting wires 30 are illustrated, but the present invention is not limited to this. The conducting wire 30 is held on the inner peripheral surface of the housing 1 by a conducting wire holding member 31 connected to the lower bottom flange of the bobbin 11 .

Before enclosing the mold resin 10, the stator 12 is arranged in the inner cylinder of the housing 1, as shown in FIG. 3(b). The housing 1 has a lead-out port 33 for drawing out the conductor 30 to the outside of the housing. Conductive wires 30 arranged along the inner periphery of the housing 1 are eventually guided to the outside from outlets 33 and connected to a power supply or the like. A plurality of outlets 33 may be provided, and their positions are not limited to this example.
Although the details will be described later, in this embodiment, the conductor wire 30 and the conductor wire holding member 31 are also molded in the mold resin 10 together with the stator 12 .

FIG. 4 schematically shows an example of a process for sealing the mold resin 10. As shown in FIG. In this figure, the top and bottom (up and down in the figure) are reversed from FIG. 3, and the upper side of the figure is the load side. The lower die B enters the inner cylinder space through the opening on the opposite side of the housing 1 , and the stator 12 is arranged in the inner cylinder space of the housing 1 . A middle size C is arranged in the center of the stator 12 . Next, by inserting the upper die A into the inner cylindrical space from the load side opening of the housing 1, the stator 12 is moved to the space surrounded by the inner circumference of the thick portion 13 of the housing 1, the upper die A, the lower die B and the middle die C. is positioned at

Here, the stator 12 is positioned within the width of the thick portion 13 of the housing 1 in the axial direction. The thick portion 13 is a central portion of the inner circumference of the housing 1 in the axial direction, and is a portion that has a predetermined thickness and becomes thicker toward the axial center. The thick portion 13 has a shape that is continuous in the axial direction and in the circumferential direction and has the same thickness as an annular convex portion in the axial direction. It should be noted that the thick portion 13 need not be entirely occupied by portions of the same thickness, and a portion of the thick portion 13 may have a recess or the like in the outer peripheral direction. As will be described below, if the structure can ensure the resistance of the housing against the sealing pressure of the mold resin 10, the thick portion 13 should be generally composed of portions that are continuous with the same thickness in the axial direction and the circumferential direction. can be effective.

It is preferable that the molding resin 10 sufficiently wraps around between the core units 12a and the inner periphery of the housing without gaps in order to provide insulation, durability of the stator 12, and secure fixation within the housing. . For this reason, the sealing pressure of the mold resin 10 may become high. Since the housing 1 must be able to withstand a high-pressure environment from the inside, having the thick portion 13 in the mold region exposed to high pressure can ensure resistance to pressure in the radial direction.

The mold resin 10 is sealed in the surrounding space (the stator 12 side) from the resin sealing holes (not shown) of the upper mold A and the lower mold B. As shown in FIG. The mold resin 10 wraps around between the core units 12a, part or all of the axial end face of the core unit 12a, between the stator 12 and the thick portion 13 of the housing 1, etc., and insulates the stator 12 and fixes it to the housing 1. and is designed to After enclosing the mold resin 10, the upper mold A, the lower mold B and the middle mold C are separated in the axial direction.

Here, the stator 12 becomes a molded stator by enclosing the mold resin 10 , but there is a possibility that the resin leaks from the gap between the upper mold A or the lower mold B and the inner circumference of the housing 1 . From the viewpoint of resin leakage, it is preferable to make the outer diameter of the upper mold A and lower mold B and the inner diameter of the housing 2 as close as possible. Problems remain from the aspect. In addition, from the viewpoint of stable fixation of the stator 12 and reliability of insulation, there are cases where the sealing pressure of the resin is set to a high pressure so that the mold resin 10 can flow between the stator 12 and the inner periphery of the housing 1 without gaps. As mentioned earlier, such pressure also acts to encourage resin leakage. It is not preferable to peel off the mold resin 10 that has leaked out from the gap after sealing the mold resin. There is also a possibility that it may affect the parts such as

Therefore, one of the features of this embodiment is that the stator 10 and the molding resin 10 for molding the stator 10 are arranged within the axial width of the thick portion 13 of the housing 1 . In other words, the boundary between the inner periphery of the housing 1 and the mold resin 10 in contact therewith is positioned within the axial width of the thick portion 13 . Furthermore, in other words, the axial width of the mold resin 10 and the inner periphery of the housing 1 in contact therewith is within the axial width of the thick portion 13 , and the axial contact area between the two is the diameter of the thick portion 13 . This point is within the directional projection plane.

A configuration and means for realizing such a configuration will be described with reference to FIGS. 5 and 6. FIG.
FIG. 5(a) is a front view when the upper die A is observed from the stator 12 side. The upper die A has an outer diameter slightly smaller than the inner diameter of the inner cylinder of the housing 1 and larger than the inner diameter of the thick portion 13 . An annular groove A5 (indicated by hatching in the figure) having a predetermined depth is provided near the outer circumference of the surface facing the stator 10 .
FIG. 5(b) schematically shows a cross section taken along the line O-O' in FIG. 5(a). The groove A5 is a place where an annular seal member 15 as shown in FIG. 5(c) is arranged. In this embodiment, the cross-sectional diameter of the seal member 15 is set to be substantially the same as or slightly larger than the groove width of the groove A5, and when placed in the groove A5, even if the top and bottom are reversed, the seal member 15 falls out of the groove A5. It is designed not to. Further, the depth of the groove A5 is smaller than the cross-sectional diameter of the seal member 15. As shown in FIG. In this manner, the sealing member 15 can be arranged to face the axial end surface 13a (stepped surface) of the thick portion 13, which will be described later. Although the cross-sectional shape of the seal member 15 is described as being circular or elliptical, it may be other shapes such as rectangular.

The seal member 15 is a member that seals the contact surface between the axial end surface 13a of the thick portion 13 of the housing 1 and the upper mold A. As shown in FIG. The seal member 15 is positioned between the upper die A that enters the housing 1 and the axial end surface 13a of the thick portion 13, and is sandwiched and pressed between the two to be deformed so that the thick portion 13 and the upper die are separated from each other. The gap between the contact surfaces on the outer peripheral side of A is sufficiently sealed. This can prevent the mold resin 10 from leaking to the rotor side.
In this embodiment, the sealing member 15 is described as applying an elastic member such as rubber or soft resin, but the present invention is not limited to this. For example, depending on the magnitude of the pressing force between the upper die A and the thick portion 13 and the materials of both, it is also possible to apply metal, hard resin, or the like. For example, when the upper die A is made of stainless steel and the thick portion 13 is made of iron, the sealing member 15 may be made of aluminum having a lower hardness than both. Alternatively, when a metal such as aluminum is used for the seal member 15, it is preferable from the standpoint of maintenance of the motor 100 that the hardness of the metal is lower than that of the material forming the axial end surface 13a.
As described above, although it depends on the smoothness of the axial end surface 13a of the thick portion 13 and the contact surface of the upper die A, if this is allowed, the sealing effect can be obtained even if the metal such as aluminum is deformed by pressing. can be obtained.

In addition, as shown in FIG. 5A and the like, in the present embodiment, the position of the inner edge of the groove A5 is positioned outside the axis side angle (double-dot chain line) of the axial end surface 13a of the thick portion 13. is located in Advantages of such a configuration will be described in detail with reference to FIG.

FIG. 6(a) schematically shows the state transition in which the upper die A enters the housing 1, and FIG. 6(b) schematically shows the state transition in which the upper die A and the thick portion 13 come into contact with each other. As shown in FIG. 6(a), the cross-sectional shape is maintained until it is pressed. As shown in FIG. 6(b), the upper die A and the axial end surface 13a of the thick portion abut against each other, and the seal member 15 is deformed by pressing. As described above, the position of the inner edge of the groove A5 is outside the axial center side angle of the axial end face 13a of the thick portion 13. As shown in FIG. That is, the press-deformed seal member 15 expands to the axial center side, and the enlarged portion is also sufficiently pressed in the axial direction by the upper die A and the axial end surface 13a, so that an increase in the seal area can be expected.

Further, although the gap is sealed by the seal member 15, the higher the sealing pressure of the mold resin 10, the greater the force that pushes the seal member 15 to the outer peripheral side. Furthermore, since a high pressure is also generated between the seal member 15 and the upper die A, the resin may leak from such a portion. In this regard, in this embodiment, since the seal member 15 is held in the groove A of the upper die A, first, the groove A5 firmly holds the seal member 15, so that the seal member 15 itself is held by the outer circumference. prevent it from pushing out to the side. Next, a labyrinth structure is formed between the seal member 15 and the groove A5, and such a structure can prevent the mold resin 10 from leaking from between the seal member 15 and the groove A5.

FIG. 7 schematically shows a vertical cross-section of the stator 12 and the housing 1 in a state in which each resin mold is removed after enclosing the molding resin 10 in the rotation axis direction. The axial dimension between the boundary between the mold resin 10 and the thick portion 13 on the load side and the anti-load side is also the same or the mold resin 10 is shorter. This is because the sealing action of the axial end face 13a of the thick portion, the sealing member 15, etc. prevents the resin from leaking to the rotor 7 side. As a result, the performance and reliability of the motor 100 are improved, and the step of peeling off the leaked resin does not occur.

Further, the axial width L1 of the thick portion 13 is greater than or equal to the axial width L2 of the stator 12 . That is, the housing 13 can obtain sufficient pressure resistance against the pressure when the molding resin 10 is press-fitted. Wrapping the mold resin 10 with a high density greatly contributes to the insulation and durability of the motor 100 . Such an effect can be achieved by having the thick portion 13 at least at the portion where a high pressure (especially high pressure in the radial direction) is applied. By increasing the thickness of only the high-pressure load portion, the thickness of the other portions can be reduced and weight reduction can be achieved, and it can be said that the degree of spatial freedom in the thin portion is improved.

Although the load side has been described, the seal on the non-load side is similar to that of the upper die A, and the lower die B, together with the seal member 15 and the axial end surface 13a of the thick portion, exerts the same effect. Play.
In particular, in this embodiment, the mold resin 10 integrally molds the conductive wire 30 with the stator and the like, and the resin wraps around a part or all of the outlet 33, so that the stator 12 and its constituent parts are formed. It can be said that it is possible to sufficiently integrally mold and to prevent leakage of the mold resin 10, and to obtain a remarkable effect in terms of reliability and the like.

The above is the first embodiment for carrying out the present invention. According to the first embodiment, the performance, durability, reliability, workability, etc. of the motor 100 can be improved.

Example 2 will be described. The main differences between the second embodiment and the first embodiment are the following two points.
First, the upper die has no groove on the outer peripheral side of the surface facing the stator and has a step at an outer peripheral angle, and the sealing member is arranged at this step.
Secondly, in the first embodiment, the conductor drawn out from the core unit is arranged to protrude from the stator in the axial direction opposite to the load side. An extraction port is arranged, and the mold resin 10 wraps around the stator 12 integrally with them.

In the following description, members having the same functions and effects as in Embodiment 1 are denoted by the same reference numerals, and detailed description may be omitted.

FIG. 8 schematically shows a partially enlarged cross section of the upper die Aa (the same applies to the lower die Ba) and the sealing member 15b according to Example 2. As shown in FIG. As shown in FIG. 8(a). The outer peripheral angle of the upper die Aa on the stator 12 side has a step A10. The axial dimension (width) of the step A10 may be larger than, equal to, or smaller than the cross-sectional diameter of the seal member 15b. The radial dimension (width) of the step A10 is preferably smaller than the cross-sectional diameter of the seal member 15b. The seal member 15b is an elastic member having a larger cross-sectional diameter than the seal member 15b of the first embodiment.

As shown in FIG. 8(b), the upper die Aa enters the inner cylinder of the housing 1, and soon the seal member 15b comes into contact with the axial end surface 13a of the thick portion 13. As shown in FIG. The pressure deforms the sealing member 15b so as to expand toward the axial center side and the outer peripheral side. Here, in the present embodiment, the upper die Aa on the axial side of the step A10 enters to a position slightly shorter than the axial dimension of the thick portion 13 . With such a configuration, the seal member 15b is deformed more complicatedly between the axial end surface 13a of the thick portion and the step A10. In the example of FIG. 8(b), a part of the deformed seal member 15b deforms and advances to the moving direction side of the upper mold Aa, thereby generating a positive sealing effect.

FIG. 9 schematically shows an axial longitudinal section of the stator 12, the mold resin 10, and the housing 1 with the resin molds removed from the housing 1 after the step of enclosing the mold resin 10 in FIG. 8(b). The boundary between the mold resin 10 and the axial end face 13a of the thick portion on the inner peripheral surface of the housing is not located outside the axial end face 13b on both the load side and the anti-load side (set within L3). In other words, the boundary may be positioned axially inward (toward the stator 12) from the axial center side angle of the axial end surface 13a.

Also, the stator 12 and the mold resin 10 are included within the radial projection plane of the thick portion 13 . That is, there is no resin burr that leaks along the inner periphery of the housing and sticks to the thin wall. Furthermore, the thick wall portion 13 is the only part of the housing that is subjected to a high pressure load during encapsulation of the mold. Therefore, it can be said that the performance, reliability, durability, and workability of the motor 100 are improved.

[Modification]
Although the first and second embodiments have been described above, modified examples of the seal member 15 (15b) and the thick portion 13 of the housing 1 will be described with reference to FIGS. 10 and 11. FIG.

FIG. 10 shows various configurations of the upper die (lower die), the thick portion, and the sealing member.
FIG. 10(a) shows a configuration in which the upper die A has a plurality of (two in the figure) grooves A5 as shown in Example 1, and a sealing member 15 is arranged in each of the grooves A5. The plurality of grooves A5 have different diameters from the adjacent grooves A5 on the axial side, and have a relationship of including the adjacent grooves A5 on the axial side. Along with this, the diameter of each seal member 15 arranged in each seal member 15 also has the same relationship. It can be said that the plurality of sealing members 15 ensures or improves the sealing performance.

FIG. 10(b) has one groove A5 in the upper die A, but is characterized in that a plurality of seal members 15 are continuously arranged so that one includes the other on the axial center side. Even with such a configuration, the sealing performance can be secured or improved.
FIG. 10(c) shows that the axial end surface 13a of the thick portion has a tapered shape that is inclined in the direction in which the upper die A (or the lower die B) enters. That is, in Example 1 and the like, the axial end surface 13a is an example configured with a stepped surface that is vertical toward the axis, but this modified example is an example of a configuration that has a stepped surface that is inclined toward the axis. is. In addition, the outer peripheral corners of the upper die A also have an oppositely tapered shape along the axial end surface 13a. A seal member 15 is arranged between the axial end face 13a and the outer peripheral corner of the upper die A, which are in such a fitting relationship. The diameter of the seal member 15 may have a circular cross section, as in the other examples, or may be a plate-like annular body as shown in FIG. 10(c). Even with such a configuration, it can be expected that the sealing performance can be secured or improved.

FIG. 11 shows a modification of the thick portion 13 of the housing 1. As shown in FIG. In the above example, the thick portion is configured to be thicker from the inner cylindrical wall of the housing 1 toward the axial center side, but in this modified example, the thickness is increased not only on the axial center side but also on the outer peripheral side. One of the characteristics is the shape. For example, this shape is also suitable when the sealing pressure of the resin is increased, or when the portion other than the pressure-resistant portion of the housing 1 is made thinner. Furthermore, if the thickness of the thick portion 13 on the shaft center side is made thinner, the diameter of the stator 12 and the like can be increased accordingly. In order to secure the insufficient pressure resistance strength, it is possible to use the thick portion 13 to be brought closer to the outer peripheral side.

FIG. 11 schematically shows a longitudinal sectional view of housing 1, stator 12, and mold resin 10 according to a modification. One of the characteristics of this modification is that the thick portion 13 is thick not only on the axial side but also on the outer peripheral side.

Although various examples for carrying out the present invention have been described above, the present invention is not limited to the above configurations and the like, and various configurations can be adopted without departing from the spirit of the present invention. A part or all of the configuration of one embodiment can be applied to the configuration of another embodiment, and a part of the configuration can be omitted.

In particular, in the above embodiments and the like, both the load side and the anti-load side are sealed by the axial end surface 13a (step) and the seal member 10, but only one of them is provided with such a structure. can also be applied.

Further, in the above embodiment, an example of application to a permanent magnet type electric motor has been described, but the present invention can also be applied to an induction type electric motor, and can be applied not only to electric motors but also to generators.

DESCRIPTION OF SYMBOLS 1... Housing 2... Bracket 3... Bearing 4... Rotating shaft 5... Permanent magnet 6... Back yoke (base) 7... Rotor 8... Core 9... Coil 10... Mold resin 11... Bobbin 12 Stator 12a Core unit 13 Thick portion 13a Axial end face (of thick portion) 14 Connecting member 15/15b Sealing member 30 Conducting wire (connecting wire/leading wire) ), 31... conductor holding member, 33... outlet, A/Aa... upper die, A5/B5... groove, A10, B/Bb... lower die, C... medium die, L1... (thick part ) Axial width dimension, L2: Axial width dimension (of stator), L3: Axial width dimension between boundaries (of mold resin and thick portion), 100: Axial gap type electric motor (motor)

Claims (11)

A stator in which a plurality of core units having magnetic flux surfaces in the direction of the rotation axis are arranged in a ring around the rotation axis, a rotor facing the magnetic flux surface of the stator in the axial direction, and an interior housing the stator. A housing having a cylindrical space, and a mold that covers part or all of the stator and is enclosed in the stator and the inner circumference of the inner cylindrical space to integrally connect the stator and the inner circumference of the inner cylindrical space. An axial gap type rotating electric machine having a resin,
The housing has, in a part of the inner circumference of the inner cylindrical space, an annular thick portion along the inner circumference with a predetermined thickness toward the axial center,
The axial end portion of the mold resin is located at the axial end portion of the thick portion on the inner circumference of the inner cylindrical space of the thick portion, and is positioned from the inner circumference of the inner cylindrical space of the thick portion. An axial gap type electric rotating machine , which is located at the axial end of the thick portion or axially inward from the thick portion on the axial center side . The axial gap type rotary electric machine according to claim 1,
At least one end of the thick portion on the axial load side and the anti-load side is formed with a step in the axial direction from the inner circumference of the inner cylinder space,
The axial end portion of the mold resin is positioned at an axial side angle of the step on the inner circumference of the inner cylindrical space of the thick portion, and is located at an axial side angle of the step from the inner circumference of the inner cylindrical space of the thick portion. An axial gap type electric rotating machine that is located on the center side of the step on the axial side corner or axially inward of the corner of the step . The axial gap type rotary electric machine according to claim 2,
The axial gap type rotary electric machine, wherein the step is vertical toward the axial direction. The axial gap type rotary electric machine according to claim 2,
The axial gap type rotary electric machine, wherein the step is inclined toward the axial direction. The axial gap type rotary electric machine according to claim 1,
At least one end of the thick portion on the axial load side and the anti-load side is formed with a step in the axial direction from the inner circumference of the inner cylinder space,
The axial gap type electric rotating machine, wherein the mold resin is not arranged on the surface of the step. The axial gap type rotary electric machine according to claim 1,
The axial gap type rotary electric machine, wherein the thick portion has a continuous portion with the same thickness in the axial direction and the circumferential direction. The axial gap type rotary electric machine according to claim 1,
A conductor drawn out from the core unit is arranged along the inner circumference of the inner cylinder space,
An axial gap type electric rotating machine, wherein the mold resin integrally molds the conductor with the stator. The axial gap type rotary electric machine according to claim 7,
The housing has a lead-out port for drawing out the conductor wire to the outside,
The outlet is arranged at a position included in the radially projected plane of the thick portion, and the molding resin integrally molds part or all of the outlet together with the conductive wire. electric machine. The axial gap type rotary electric machine according to claim 7,
The housing has a lead-out port for drawing out the conductor wire to the outside,
The axial gap type rotary electric machine, wherein the outlet is arranged at a position included in a radial projection plane of the stator, and the mold resin integrally molds part or all of the outlet together with the conductor. The axial gap type rotary electric machine according to claim 1,
The axial gap type rotary electric machine, wherein the thick portion is also thick on a radially outer peripheral side of the housing. The axial gap type rotary electric machine according to claim 1,
An axial gap type rotating electric machine, wherein the rotating electric machine is a motor or a generator, and is of a magnet type or an induction type.

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