Stator core, stator unit, and motor

Abstract

To obtain a stator core capable of reducing iron loss and easy to manage dimensional accuracy compared with the past. A stator core (16) is configured by laminating a plurality of core plates (24) and is housed in a housing (14) of a motor (10). The plurality of core plates (24) include a core plate (24A) with elastic projections, the core plate (24A) with elastic projections being provided with a plurality of elastic projections (28) extending from an outer peripheral portion to a radially outer side and curved in an axial direction in a circumferential direction. Then, the stator core (16) is supported by the housing (14) in a state in which the plurality of elastic projections (28) are in contact with an inner peripheral surface of the housing (14) and elastically deflected.

Description

TECHNICAL FIELD

[0001] The present application relates to a stator core, a stator unit having the stator core, and a motor having the stator unit. BACKGROUND

[0002] In Japanese Patent No. 5181994, a split stator is described, which is formed by combining a plurality of stator sheets in the circumferential direction, the plurality of stator sheets each having a yoke portion extending in the circumferential direction and a tooth portion extending in the radial direction from the yoke portion. In the split stator, two slits are formed in the yoke portions of the plurality of stator sheets, respectively, the slits extending in the circumferential direction from both end surfaces of the yoke portions. Thus, by concentrating stress generated when the plurality of stator sheets are housed in a housing in the region between the two slits, iron loss, which is a cause of a decrease in motor efficiency, is reduced.

[0003] In Japanese Patent No. 2006-333657, a motor having a stator unit and a rotor is described, in which a stator core composed of a plurality of core plates laminated is housed in a housing, and the rotor freely rotates with respect to the stator unit. In the motor, the stator core is composed of a first portion and a second portion, and the second portion is fixed so as to overlap both end portions of the first portion in the axial direction. The first portion is composed by laminating core plates having an outer diameter smaller than an inner diameter of the housing. The core plates constituting the second portion have a base portion having the same outer diameter as the core plates constituting the first portion, and a plurality of protrusion portions provided so as to extend from an outer peripheral portion of the base portion. Further, by contacting the stator core and the housing with only the plurality of protrusion portions, the region in which stress acts in the stator core is reduced. SUMMARY

[0004] PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] The prior art described in Japanese Patent No. 5181994 cannot be applied to a one-piece stator core that is not divided into a plurality of stator sheets. Further, depending on the dimensional accuracy of the housing and the stator core, the circumferential end surfaces of the respective stator sheets are in close contact with each other on the inner diameter side of the adjacent stator sheets, so that compression stress can be generated in the circumferential direction, and in order to avoid this, strict dimensional accuracy management is required. However, it is very difficult to perform such dimensional accuracy management in mass production, and even if it can be performed, it becomes a cause of an increase in manufacturing cost.

[0006] In the related art described in Japanese Patent No. 2006-333657, the rigidity of the core plate in the radial direction is high at the portion where the plurality of protruding portions provided to extend from the outer peripheral portion of the base portion of the core plate constituting the second portion are connected to the base portion. Therefore, depending on the dimensional accuracy of the housing and each of the protruding portions, the load in the radial direction received by each of the protruding portions from the housing is transmitted to the base portion of the core plate, high compressive stress is generated at the base portion (yoke portion) of the core plate, and thus it is possible to increase the iron loss.

[0007] The present application takes the above fact into consideration, and aims to obtain a stator core that is more capable of reducing the iron loss than conventional ones and is easy to manage the dimensional accuracy, a stator unit having the stator core, and a motor having the stator unit.

[0008] Means for solving the problem

[0009] The stator core of the first mode is constituted by a plurality of core plates, including a core plate with elastic protrusions, which are arranged in the circumferential direction with a plurality of elastic protrusions extending from the outer peripheral portion to the radial outside and bent in the axial direction, accommodated in a housing of a motor, and is supported by the housing in a state where the plurality of elastic protrusions are in contact with the inner peripheral surface of the housing and elastically deflected.

[0010] The stator core of the first mode is constituted by a plurality of core plates, including a core plate with elastic protrusions, which are arranged in the circumferential direction with a plurality of elastic protrusions extending from the outer peripheral portion to the radial outside and bent in the axial direction, accommodated in a housing of a motor. The stator core is supported by the housing in a state where the plurality of elastic protrusions are in contact with the inner peripheral surface of the housing and elastically deflected. Thereby, it is possible to prevent or effectively suppress the generation of compressive stress at the yoke portion of the stator core, and thus it is possible to reduce the iron loss compared to conventional ones. In addition, by the elastic deflection of the plurality of elastic protrusions, it is possible to absorb the dimensional deviation of the housing and the stator core, and thus it is easy to manage the dimensional accuracy.

[0011] The stator core of the second mode is different from the stator core of the first mode in that the plurality of elastic protrusions include inward elastic protrusions, and the tip end portion of the inward elastic protrusion is bent so as to face the radial inside of the core plate with elastic protrusions.

[0012] According to the stator core of the second mode, the plurality of elastic protrusions provided to the outer peripheral portion of the core plate with elastic protrusions include inward elastic protrusions, and the tip end portion of the inward elastic protrusion is bent so as to face the radial inside of the core plate with elastic protrusions. Therefore, if the stator core is displaced in the radial direction with respect to the housing, the tip end portion of the inward elastic protrusion comes into contact with the outer peripheral surface of the stator core, and the spring constant of the inward elastic protrusion increases. Thereby, it is possible to suppress the displacement, and it is possible to prevent the plurality of elastic protrusions including the inward elastic protrusion from being plastically deformed.

[0013] The stator core of the third aspect, in the first aspect or the second aspect, the plurality of elastic protrusions are subjected to quenching.

[0014] According to the stator core of the third aspect, the plurality of elastic protrusions are subjected to quenching, so that permanent deformation of each elastic protrusion can be suppressed, and durability of each elastic protrusion can be improved.

[0015] The stator core of the fourth aspect, in any one of the first aspect to the third aspect, the plurality of core plates include a core plate with flat protrusions, the core plate with flat protrusions is arranged in a circumferential direction with a plurality of flat protrusions extending from an outer peripheral portion to a radial outer side, and tip end portions of the plurality of flat protrusions are arranged facing each other with a gap with respect to an inner peripheral surface of the housing.

[0016] According to the stator core of the fourth aspect, the plurality of core plates include a core plate with flat protrusions, the core plate with flat protrusions is arranged in a circumferential direction with a plurality of flat protrusions extending from an outer peripheral portion to a radial outer side. Tip end portions of the plurality of flat protrusions are arranged facing each other with a gap with respect to an inner peripheral surface of the housing. Therefore, if the stator core is displaced in a radial direction with respect to the housing, the tip end portions of the flat protrusions come into contact with the inner peripheral surface of the housing, and displacement, that is, deformation of the plurality of elastic protrusions can be limited. As a result, plastic deformation of the plurality of elastic protrusions can be prevented.

[0017] The stator unit of the fifth aspect has a housing of a motor and a stator core of any one of the first aspect to the fourth aspect housed in the housing.

[0018] In the stator unit of the fifth aspect, the stator core is housed in the housing of the motor. The stator core is the stator core of any one of the first aspect to the fourth aspect, so that the above-described effects and advantages can be obtained.

[0019] The stator unit of the sixth aspect, in the fifth aspect, a plurality of grooves into which the plurality of elastic protrusions are inserted are arranged in a circumferential direction of the inner peripheral surface of the housing, and a gap is provided between the inner peripheral surface of the housing and the outer peripheral surface of the stator core.

[0020] In the stator unit of the sixth aspect, the plurality of elastic protrusions provided at the outer peripheral portion of the core plate with elastic protrusions of the stator core are inserted into the plurality of grooves formed at the inner peripheral surface of the housing. Thus, relative rotation of the stator core with respect to the housing in the circumferential direction can be limited, so that a key or the like anti-rotation member is not required. Further, since the gap is provided between the inner peripheral surface of the housing and the outer peripheral surface of the stator core, management of dimensional accuracy becomes easy.

[0021] In the seventh stator unit, as described above, the displacement of the stator core is limited by the portion of the outer circumferential surface of the stator core contacting the portion of the inner circumferential surface of the housing. This state is within the range of elastic deformation of the plurality of elastic protrusions, and thus plastic deformation of the plurality of elastic protrusions can be prevented.

[0022] In the seventh stator unit, as described above, the displacement of the stator core is limited by the portion of the outer circumferential surface of the stator core contacting the portion of the inner circumferential surface of the housing. This state is within the range of elastic deformation of the plurality of elastic protrusions, and thus plastic deformation of the plurality of elastic protrusions can be prevented.

[0023] The eighth motor has the stator unit of any one of the fifth to seventh modes and a rotor core housed inside the stator core of the stator unit.

[0024] In the eighth motor, the rotor core is housed inside the stator core of the stator unit. The stator unit is any one of the stator units of the fifth to seventh modes, and thus the above effects and advantages can be obtained.

[0025] Effects of the Invention

[0026] As described above, the stator core, the stator unit, and the motor of the present application can reduce iron loss and facilitate dimensional accuracy management more than conventional ones. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a cross-sectional view of a motor of the first embodiment of the present application.

[0028] Figure 2 is an enlarged cross-sectional view of a cross section along the F2-F2 line of Figure 1 .

[0029] Figure 3 is an enlarged cross-sectional view of a region indicated by reference sign A in Figure 2 .

[0030] Figure 4 is a cross-sectional view for explaining core deviation of the stator core corresponding to Figure 1 .

[0031] Figure 5 is a cross-sectional view for explaining core deviation of the stator core corresponding to Figure 3 .

[0032] Figure 6 is a cross-sectional view for explaining core deviation of the stator core corresponding to a portion of Figure 1 .

[0033] Figure 7This illustrates a partial structure of the motor according to the fourth embodiment of the present invention. Figure 3 The corresponding sectional view. Detailed Implementation

[0034] <First Implementation>

[0035] The following uses Figures 1 to 4 This describes the motor 10 according to the first embodiment of the present invention. For example... Figure 1 As shown, the motor 10 of this embodiment is an internal rotor type with a rotor core 18 disposed within the stator unit 12. The stator unit 12 has a housing 14 formed in the shape of a bottomed cylindrical shell and a stator core 16 housed within the housing 14.

[0036] The rotor core 18 constitutes the iron core of the rotor and is formed in a cylindrical shape. This rotor core 18 is composed of multiple core plates stacked together. Furthermore, in... Figure 2 The image shows a rotor core 18. A rotating shaft (not shown) is coaxially fixed to the center of the rotor core 18. This rotating shaft is supported rotatably by a housing 14 via a bearing (not shown). A plurality of magnet holes 20 are formed circumferentially on the outer periphery of the rotor core. Permanent magnets (not shown) are inserted into these magnet holes 20.

[0037] The stator core 16 constitutes the iron core of the stator and is formed in a generally cylindrical shape. This stator core 16 is constructed by stacking multiple core plates 24. Furthermore, in... Figure 2 as well as Figure 3 In the diagram, the cross-sectional lines of each core plate 24 are omitted. Multiple core plates 24 are formed by stamping electrical steel sheets into a ring shape and stacked in the axial direction. A yoke 16A is provided on the outer periphery of the stator core 16, and multiple teeth 16B are provided on the inner periphery of the stator core 16. The multiple teeth 16B are arranged circumferentially on the stator core 16 at equal intervals. A winding (not shown) is wound around these teeth 16B to form a coil.

[0038] In the plurality of core boards 24, each predetermined number (e.g., every 10 boards) arranged in the lamination direction includes a core board 24A with elastic protrusions, and a predetermined number (e.g., 9 boards) of non-protruding core boards 24B are arranged between adjacent core boards 24A with elastic protrusions in the lamination direction. That is, the plurality of core boards 24 are composed of a plurality of core boards 24A with elastic protrusions and a plurality of non-protruding core boards 24B. The plurality of non-protruding core boards 24B and the plurality of core boards 24A with elastic protrusions are joined together by, for example, riveting.

[0039] The core plate 24B without protrusions is formed as an annular shape without protrusions on its inner and outer peripheries. The core plate 24A with elastic protrusions has a main body 26 with the same structure as the core plate 24B without protrusions, and a plurality of elastic protrusions 28 extending from the outer periphery of the main body 26. The plurality of elastic protrusions 28 extend radially outward from the main body 26 and bend axially towards one side of each core plate 24. The plurality of elastic protrusions 28 are arranged at equal intervals (in this case, 90-degree intervals) in the circumferential direction of each core plate 24. Each elastic protrusion 28 is formed by bending a portion of the electrical steel sheet constituting the core plate 24A with elastic protrusions, such as... Figure 2 as well as Figure 3 As shown, when viewed circumferentially from each core plate 24, the bending is in the shape of an arc. These multiple elastic protrusions 28 are elastic. Furthermore, these multiple elastic protrusions 28 have undergone quenching (heat treatment) such as carburizing and quenching.

[0040] In this embodiment, as described above, among the plurality of core boards 24, each predetermined number of core boards 24 arranged in the stacking direction includes a core board 24A with elastic protrusions. Furthermore, the core boards 24A with elastic protrusions, which are adjacent in the stacking direction and sandwiched between a predetermined number of core boards 24B without protrusions, are arranged such that their phases are offset by a predetermined angle (in this case, 45 degrees) in the circumferential direction. Moreover, the number and arrangement of the elastic protrusions 28 can be appropriately varied.

[0041] The stator core 16 of the above structure is housed inside the housing 14 and is supported (held) by the housing 14 in a state of elastic flexing due to contact between a plurality of elastic protrusions 28 and the inner circumferential surface of the housing 14. That is, the stator core 16 is supported relative to the housing 14 by the spring load generated by the plurality of elastic protrusions 28 flexing as described above, and is coaxially arranged relative to the housing 14. The rigidity when each elastic protrusion 28 deforms radially inward toward the stator core 16 is set to be lower than the rigidity when the plate body 26 deforms radially inward toward the stator core 16. The spring load of the plurality of elastic protrusions 28 is set so as not to change significantly due to deviations in the inner diameter of the housing 14 and the outer diameter of the stator core 16.

[0042] (Functions and effects)

[0043] Next, the function and effects of this implementation method will be explained.

[0044] In the present embodiment, the stator core 16 is constructed by stacking a plurality of core plates 24, and is housed in the housing 14 of the motor 10. The plurality of core plates 24 include a core plate 24A with elastic projections, which is provided with a plurality of elastic projections 28 extending from the outer peripheral portion to the radially outer side and curved in the axial direction. The stator core 16 is supported by the housing 14 in a state in which the plurality of elastic projections 28 are in contact with the inner peripheral surface of the housing 14 and elastically deflected. Thus, it is possible to prevent or effectively suppress the generation of compressive stress in the yoke portion 16A of the stator core 16, and therefore, it is possible to reduce the iron loss as compared with the past. In addition, by the elastic deflection of the plurality of elastic projections 28, it is possible to absorb the dimensional deviation of the housing 14 and the stator core 16, and therefore, the dimensional precision management becomes easy.

[0045] In order to supplement the above-described effect, for example, in the case in which a smooth cylindrical stator core is fixed to the housing of the motor at the outer peripheral portion, it is generally fixed by an interference fit. In this case, by applying a load toward the radially inner side to the outer peripheral surface of the stator core, circumferential compressive stress is generated in the yoke portion of the stator core, and thus the iron loss increases. In order to reduce the above-described compressive stress as much as possible, it is necessary to strictly manage the dimensional precision, but in reality, a certain amount of dimensional deviation occurs. In addition, since the stator core and the housing are high in rigidity, the fixing force greatly changes due to a slight dimensional deviation. Therefore, depending on the situation, it can not be possible to obtain the required fixing force, and in order to prevent this, the dimensional tolerance is designed so as to be an interference fit that reliably generates the required fixing force. In this case, when the maximum interference fit amount within the deviation range is obtained, an excessive fixing force is generated by the interference fit amount that exceeds the required degree, the compressive stress acting on the yoke portion of the stator core increases, and thus the iron loss increases.

[0046] In view of this, in the present embodiment, the stator core 16 is supported by the housing 14 by the spring load of the plurality of elastic projections 28 provided at the outer peripheral portion of the core plate 24A with elastic projections. The rigidity when each elastic projection 28 is deformed toward the radially inner side of the stator core 16 is set to be lower than the rigidity when the plate main body 26 is deformed toward the radially inner side of the stator core 16. Thus, even if there is a dimensional error in the stator core 16 and the housing 14, the load in the radial direction applied to the yoke portion 16A of the stator core 16 does not greatly change, and it is possible to maintain the holding force of the stator core 16 within an appropriate range. As a result, as compared with the past, it is possible to reduce the iron loss, and it is possible to improve the efficiency of the motor 10.

[0047] In addition, in the present embodiment, heat of the stator core 16 generated when the motor 10 is driven can be transmitted to the housing 14 via the plurality of elastic protrusions 28, and dissipated to the outside of the motor 10 from the housing 14. That is, the plurality of elastic protrusions 28 function as a heat dissipation member. Moreover, since the plurality of elastic protrusions 28 are provided integrally with the outer peripheral portion of the core plate 24A, the number of components can be reduced compared to a case where a heat dissipation member is provided separately from the core plate 24, and this contributes to a reduction in manufacturing cost.

[0048] In addition, in the present embodiment, the plurality of elastic protrusions 28 are subjected to quenching such as carburizing quenching, and thus permanent deformation of each elastic protrusion 28 can be suppressed, and durability of each elastic protrusion 28 can be improved. As a result, even in a case where the magnetic attraction of the motor 10 is large, a case where the vibration of the stator core is large, or a case where the vibration frequency of the stator core 16 is high, permanent deformation of the plurality of elastic protrusions 28 can be suppressed. Thus, it is possible to prevent Figure 4 the stator core 16 from being irreversibly eccentric with respect to the housing 14 as in Comparative Example 10' shown in FIG. 10 (G1 Figure 4

[0049] That is, if magnetic attraction that plastically deforms the elastic protrusions 28 is generated between the rotor core 18 and the stator core 16, the stator core 16 and the housing 14 will be irreversibly eccentric. The above magnetic attraction is generated by the eccentricity of the rotor core 18 and the stator core 16, but the smaller the gap between the rotor core 18 and the stator core 16, the greater the magnetic attraction, and thus the eccentricity further promotes the eccentricity. Due to such eccentricity, permanent deformation of each elastic protrusion 28 becomes a problem, and in the present embodiment, permanent deformation of each elastic protrusion 28 can be suppressed by the above quenching.

[0050] Next, other embodiments of the present application will be described. In addition, for structures and effects that are substantially the same as those of the already described embodiments, the same reference numerals are assigned, and the description thereof will be omitted.

[0051] <Second Embodiment>

[0052] In Figure 5 the present embodiment, the partial structure of the motor of the second embodiment of the present application is the same as that of the first embodiment of the present application, and thus the description thereof will be omitted. Figure 3 ​A corresponding sectional view is shown. The structure of this embodiment is basically the same as that of the first embodiment, and at the outer peripheral portion of the core plate 24A with elastic protrusions, a plurality of inward elastic protrusions 28A are arranged in the circumferential direction. These inward elastic protrusions 28A, like the elastic protrusions 28 of the first embodiment, extend to the radially outer side of the plate main body 26 and are bent toward one side in the axial direction of each core plate 24, but are configured to be bent in two stages. Specifically, a curved portion 29 is formed at the leading end portion side of each inward elastic protrusion 28A, the curved portion 29 has a smaller bending radius than the base end portion side of each inward elastic protrusion 28A, and each inward elastic protrusion 28A is bent in such a manner that the leading end portion faces the radially inner side of the core plate 24A with elastic protrusions. The leading end portion of each inward elastic protrusion 28A is arranged so as to be separated from the outer peripheral surface of the stator core 16. In addition, within the range of dimensional deviations occurring in the housing 14 and the stator core 16, the leading end portion of each inward elastic protrusion 28A is configured not to come into contact with the outer peripheral surface of the stator core 16.

[0053] In this embodiment, the structure other than the above is the same as that of the first embodiment. Therefore, in this embodiment, substantially the same operational effects as those of the first embodiment can be obtained. Also, in this embodiment, if the stator core 16 is displaced in the radial direction with respect to the housing 14, the amount of deflection of the inward elastic protrusion 28A in the direction of displacement increases. As a result, the leading end portion of the inward elastic protrusion 28A comes into contact with the outer peripheral surface of the stator core 16, and the spring constant of the inward elastic protrusion 28A increases (changes). Thus, it is possible to suppress displacement of the stator core 16 and to prevent plastic deformation of the inward elastic protrusion 28A. As a result, it is possible to prevent Figure 4 irreversible core displacement of the stator core 16 as shown.

[0054] In addition, when the amount of deflection of the inward elastic protrusion 28A is small, that is, when the leading end portion of each inward elastic protrusion 28A does not come into contact with the outer peripheral surface of the stator core 16, the stator core 16 is supported by the spring load of the plurality of elastic protrusions 28. Thus, it is possible to prevent or effectively suppress the generation of compressive stress on the yoke portion 16A of the stator core 16, and therefore, it is possible to reduce the iron loss compared to the past. In addition, by elastic deflection of the plurality of elastic protrusions 28, it is possible to absorb dimensional deviations of the housing 14 and the stator core 16, and therefore, dimensional precision management becomes easy.

[0055] <Third Embodiment>

[0056] In Figure 6 , a partial structure of a motor of the third embodiment of the present application is shown using a sectional view corresponding to a part of Figure 1 . The structure of this embodiment is basically the same as that of the first embodiment, but a plurality of grooves 30 for insertion (fitting) of a plurality of elastic protrusions 28 are arranged in the circumferential direction of the inner peripheral surface of the housing 14Figure 6 (Only one is shown in the figure). The plurality of grooves 30 extend in the axial direction of the housing 14. The depth of the plurality of grooves 30 is set such that an annular gap 32 is formed between the inner peripheral surface of the housing 14 and the outer peripheral surface of the stator core 16. In addition, the width of each groove 30 is set to be the same as the width of each elastic protrusion 28. In this embodiment, when the stator core 16 is radially displaced relative to the housing 14, within the range of elastic deformation of the plurality of elastic protrusions 28, a portion of the outer peripheral surface of the stator core 16 contacts a portion of the inner peripheral surface of the housing 14.

[0057] In this embodiment, the structure other than that described above is the same as in the first embodiment. Therefore, in this embodiment, the same effect as in the first embodiment can be obtained. Furthermore, the plurality of elastic protrusions 28 of the stator core 16 are inserted into the plurality of slots 30 of the housing 14. Thus, the rotational torque generated when driving the motor 10 can be borne by the engaging portion of the plurality of elastic protrusions 28 and the plurality of slots 30. As a result, the relative rotation of the stator core 16 with respect to the housing 14 in the circumferential direction can be restricted without using anti-rotation components such as keys. In addition, a gap 32 is provided between the outer peripheral surface of the housing 14 and the outer peripheral surface of the stator core 16, thus absorbing dimensional deviations of the housing 14 and the stator core 16. Furthermore, in this embodiment, when the stator core 16 is radially displaced relative to the housing 14, a portion of the outer peripheral surface of the stator core 16 contacts a portion of the inner peripheral surface of the housing 14, thereby restricting the aforementioned displacement of the stator core 16. This state is within the range of elastic deformation of the plurality of elastic protrusions 28, thus preventing plastic deformation of the plurality of elastic protrusions 28. As a result, it is possible to prevent… Figure 4 The stator core 16 shown is an irreversible off-center.

[0058] <Fourth Implementation>

[0059] exist Figure 7 In the fourth embodiment of the present invention, a portion of the motor structure is used for... Figure 3 The corresponding cross-sectional view is shown. The structure of this embodiment is basically the same as that of the first embodiment, but the plurality of core plates 24 include a plurality of core plates 24C with flat protrusions. The plurality of core plates 24C with flat protrusions are arranged in the circumferential direction with a plurality of flat protrusions 34 extending radially outward from the outer periphery. The core plate 24C with flat protrusions has a plate body 26 with the same structure as the core plate 24B without protrusions and a plurality of flat protrusions 34 extending from the outer periphery of the plate body 26. The front ends of the plurality of flat protrusions 34 are arranged facing each other with a gap relative to the inner peripheral surface of the housing 14.

[0060] In this embodiment, the structure other than the above is the same as that of the first embodiment. Therefore, in this embodiment, substantially the same advantageous effects as those of the first embodiment can be obtained. Also, in this embodiment, if the stator core 16 is displaced in the radial direction with respect to the housing 14, the leading end portion of the flat protrusion 34 comes into contact with the inner peripheral surface of the housing 14, and displacement of the stator core 16, that is, deformation of the plurality of elastic protrusions 28 can be restricted. As a result, plastic deformation of the plurality of elastic protrusions 28 can be prevented.

[0061] The present application has been described above by way of several embodiments, but the present application can be implemented in various ways without departing from the gist thereof. Needless to say, the scope of the present application is not limited to the above-described embodiments.

[0062] Furthermore, the entire disclosure of Japanese Patent Application 2019-189689 filed on October 16, 2019 is hereby incorporated by reference into the present specification. All documents, patent applications, and technical specifications that are mentioned in the present specification are hereby incorporated by reference to the same extent as if each individual document, patent application, and technical specification was specifically and individually indicated to be incorporated by reference.

Claims

1. A stator core, comprising multiple stacked core plates, housed within a motor housing, wherein, The plurality of core plates include core plates with elastic protrusions, wherein the core plates with elastic protrusions are arranged circumferentially with a plurality of elastic protrusions extending radially outward from the outer periphery and bending toward one side of the axial direction. The stator core is supported by the housing in a state of elastic flexing due to the contact of the plurality of elastic protrusions with the inner circumferential surface of the housing, and The plurality of core plates include core plates with flat protrusions, wherein the core plates with flat protrusions are arranged circumferentially with a plurality of flat protrusions extending radially outward from the outer periphery. The front ends of the plurality of planar protrusions are arranged facing each other with a gap relative to the inner circumferential surface of the housing. The core plate with flat protrusions is stacked on the core plate with elastic protrusions on the other side of the axial direction. The plurality of elastic protrusions and the plurality of planar protrusions are arranged in an axial direction.

2. The stator core according to claim 1, wherein, The plurality of elastic protrusions include inward elastic protrusions, the front ends of which are bent toward the radially inward side of the core plate with elastic protrusions.

3. The stator core according to claim 1, wherein, The multiple elastic protrusions were quenched.

4. The stator core according to claim 2, wherein, The multiple elastic protrusions were quenched.

5. A stator unit, wherein, A housing having a motor and a stator core as described in any one of claims 1 to 4 housed within the housing.

6. The stator unit according to claim 5, wherein, Multiple slots are arranged circumferentially on the inner circumferential surface of the housing for the insertion of the multiple elastic protrusions, and a gap is provided between the inner circumferential surface of the housing and the outer circumferential surface of the stator core.

7. The stator unit according to claim 6, wherein, When the stator core is radially displaced relative to the housing, within the range of elastic deformation of the plurality of elastic protrusions, a portion of the outer peripheral surface of the stator core contacts a portion of the inner peripheral surface of the housing.

8. A motor, wherein, The stator unit comprising any one of claims 5 to 7 and a rotor core disposed inside the stator core of the stator unit.

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