WO2021075275A1 - ステータコア、ステータユニット及びモータ - Google Patents
ステータコア、ステータユニット及びモータ Download PDFInfo
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- WO2021075275A1 WO2021075275A1 PCT/JP2020/037470 JP2020037470W WO2021075275A1 WO 2021075275 A1 WO2021075275 A1 WO 2021075275A1 JP 2020037470 W JP2020037470 W JP 2020037470W WO 2021075275 A1 WO2021075275 A1 WO 2021075275A1
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- WIPO (PCT)
- Prior art keywords
- core
- case
- stator core
- stator
- elastic protrusions
- Prior art date
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- 230000002093 peripheral effect Effects 0.000 claims description 63
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 24
- 229910052742 iron Inorganic materials 0.000 abstract description 11
- 238000005452 bending Methods 0.000 abstract description 8
- 238000010030 laminating Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000007665 sagging Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005255 carburizing Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
Definitions
- the present invention relates to a stator core, a stator unit having the stator core, and a motor having the stator unit.
- a plurality of stator pieces each having a yoke portion extending in the circumferential direction and a teeth portion extending in the radial direction from the yoke portion are formed by being combined in the circumferential direction.
- a split stator is described.
- two slits extending in the circumferential direction from both end faces in the circumferential direction of the yoke portion are formed in each of the yoke portions of the plurality of stator pieces.
- Japanese Patent No. 2006-333657 discloses a motor having a stator unit in which a stator core formed by laminating a plurality of core plates is housed in a case, and a rotor that is rotatable with respect to the stator unit. ing.
- the stator core is composed of a first portion and a second portion fixed so as to overlap both ends of the first portion in the axial direction.
- the first portion is composed of laminated core plates having an outer diameter smaller than the inner diameter of the case.
- the core plate constituting the second portion has a base portion having the same outer diameter as the core plate constituting the first portion, and a plurality of protrusions extending from the outer peripheral portion of the base portion. Then, by bringing the stator core and the case into contact with each other only by these a plurality of protrusions, the region where stress acts on the stator core is reduced.
- an object of the present invention is to obtain a stator core, a stator unit having the stator core, and a motor having the stator unit, which can reduce iron loss and can easily control dimensional accuracy.
- the stator core of the first aspect is a stator core in which a plurality of core plates are laminated and housed in a motor case, and the plurality of core plates extend radially outward from an outer peripheral portion and have a shaft.
- a core plate with elastic protrusions in which a plurality of elastic protrusions bent in the direction are provided side by side in the circumferential direction is included, and the plurality of elastic protrusions come into contact with the inner peripheral surface of the case and flex elastically. It is supported by the case in the state.
- the stator core of the first aspect is configured by laminating a plurality of core plates and is housed in a motor case.
- the plurality of core plates include a core plate with elastic protrusions in which a plurality of elastic protrusions extending radially outward from the outer peripheral portion and bent in the axial direction are provided side by side in the circumferential direction.
- the stator core is supported by the case in a state where the plurality of elastic protrusions are in contact with the inner peripheral surface of the case and elastically flexed.
- the elastic bending of the plurality of elastic protrusions can absorb the dimensional variation of the case and the stator core, the dimensional accuracy can be easily controlled.
- the stator core of the second aspect includes inward elastic protrusions whose tips are bent so as to face radially inward of the core plate with elastic protrusions. ..
- the plurality of elastic protrusions provided on the outer peripheral portion of the core plate with elastic protrusions are inwardly elastic with their tips bent inward in the radial direction of the core plate with elastic protrusions. Includes protrusions. Therefore, when the stator core is displaced in the radial direction with respect to the case, 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. As a result, the above-mentioned displacement can be suppressed, and it is possible to prevent a plurality of elastic protrusions including the inward elastic protrusions from being plastically deformed.
- the plurality of elastic protrusions are hardened.
- stator core of the third aspect since the plurality of elastic protrusions are hardened, it is possible to suppress the sagging of each elastic protrusion and improve the durability of each elastic protrusion. ..
- a plurality of plano protrusions extending radially outward from the outer peripheral portion are arranged in the circumferential direction on the plurality of core plates.
- the core plate with flat protrusions provided in the above is included, and the tip portions of the plurality of plank protrusions are arranged so as to face the inner peripheral surface of the case with a gap.
- the plurality of core plates include a core plate with planks in which a plurality of plank protrusions extending radially outward from the outer peripheral portion are provided side by side in the circumferential direction.
- the tip portions of the plurality of plano protrusions are arranged so as to face each other with a gap from the inner peripheral surface of the case. Therefore, when the stator core is displaced in the radial direction with respect to the case, the tip portion of the plano protrusion comes into contact with the inner peripheral surface of the case, and the above displacement, that is, the deformation of the plurality of elastic protrusions can be regulated. As a result, it is possible to prevent the plurality of elastic protrusions from being plastically deformed.
- the stator unit of the fifth aspect has a motor case and a stator core of any one of the first aspect 1 to the fourth aspect housed in the case.
- stator core is housed in the case of the motor. Since this stator core is the stator core of any one of the first to fourth aspects, the above-mentioned actions and effects can be obtained.
- a plurality of grooves into which the plurality of elastic protrusions are inserted are formed on the inner peripheral surface of the case so as to be arranged in the circumferential direction.
- a gap is provided between the inner peripheral surface and the outer peripheral surface of the stator core.
- stator unit of the sixth aspect a plurality of elastic protrusions provided on the outer peripheral portion of the core plate with elastic protrusions of the stator core are inserted into a plurality of grooves formed on the inner peripheral surface of the case.
- the stator unit of the seventh aspect is one of the outer peripheral surfaces of the stator core within a range in which the plurality of elastic protrusions are elastically deformed when the stator core is displaced in the radial direction with respect to the case.
- the portion contacts a part of the inner peripheral surface of the case.
- the displacement of the stator core is regulated by contacting a part of the outer peripheral surface of the stator core with a part of the inner peripheral surface of the case as described above. Since this state is within the range in which the plurality of elastic protrusions are elastically deformed, it is possible to prevent the plurality of elastic protrusions from being plastically deformed.
- the motor of the eighth aspect includes a stator unit of any one of the fifth to seventh aspects, and a rotor core housed inside the stator core of the stator unit.
- the rotor core is housed inside the stator core of the stator unit. Since the above-mentioned stator unit is the stator unit of any one of the fifth to seventh aspects, the above-mentioned actions and effects can be obtained.
- stator core As described above, in the stator core, the stator unit and the motor according to the present invention, iron loss can be reduced and dimensional accuracy control is easy as compared with the conventional case.
- FIG. 5 is an enlarged cross-sectional view showing an enlarged cut surface along the line F2-F2 of FIG.
- FIG. 2 is an enlarged cross-sectional view showing an enlarged region designated by reference numeral A in FIG. 2.
- FIG. 1 for demonstrating the eccentricity of a stator core.
- FIG. 3 shows the partial structure of the motor which concerns on 2nd Embodiment of this invention.
- FIG. 3 shows the partial structure of the motor which concerns on 4th Embodiment of this invention.
- the motor 10 according to the first embodiment of the present invention is an inner rotor type in which a rotor core 18 is provided in a stator unit 12.
- the stator unit 12 has a case 14 formed in a bottomed tubular shape and a stator core 16 housed in the case 14.
- the rotor core 18 constitutes the iron core of the rotor and is formed in a cylindrical shape.
- the rotor core 18 is configured by laminating a plurality of core plates.
- FIG. 2 schematically shows the rotor core 18.
- a rotating shaft (not shown) is coaxially fixed to the axial center of the rotor core 18.
- the rotating shaft is rotatably supported by the case 14 via a bearing (not shown).
- a plurality of magnet holes 20 are formed side by side in the circumferential direction on the outer peripheral side of the rotor core. Permanent magnets (not shown) are inserted into these magnet holes 20.
- the stator core 16 constitutes the iron core of the stator and is formed in a substantially cylindrical shape.
- the stator core 16 is configured by laminating a plurality of core plates 24. Note that in FIGS. 2 and 3, hatching of the cross section of each core plate 24 is omitted.
- the plurality of core plates 24 are made by punching out an electromagnetic steel plate in an annular shape, and are laminated in the axial direction.
- a yoke portion 16A is provided on the outer peripheral side of the stator core 16, and a plurality of tooth portions 16B are provided on the inner peripheral side of the stator core 16.
- the plurality of tooth portions 16B are arranged side by side in the circumferential direction of the stator core 16 at equal intervals.
- a winding (not shown) is wound around these teeth portions 16B to form a coil.
- the plurality of core plates 24 include core plates 24A with elastic protrusions for each predetermined number (for example, every 10 sheets) arranged in the stacking direction, and between the core plates 24A with elastic protrusions adjacent to each other in the stacking direction.
- a predetermined number (for example, 9) of core plates 24B without protrusions are arranged. That is, the plurality of core plates 24 are composed of a plurality of core plates 24A with elastic protrusions and a plurality of core plates 24B without protrusions.
- the plurality of core plates 24B without protrusions and the plurality of core plates 24A with elastic protrusions are connected to each other by, for example, caulking.
- the protrusionless core plate 24B is formed in an annular shape having no protrusions on the inner peripheral portion and the outer peripheral portion.
- the core plate 24A with elastic protrusions has a plate main body 26 having the same configuration as the core plate 24B without protrusions, and a plurality of elastic protrusions 28 extending from the outer peripheral portion of the plate main body 26.
- the plurality of elastic protrusions 28 extend outward in the radial direction of the plate body 26 and are bent to one side in the axial direction of each core plate 24.
- the plurality of elastic protrusions 28 are arranged side by side at equal intervals (here, 90 degree intervals) in the circumferential direction of each core plate 24.
- Each of the elastic protrusions 28 is obtained by bending a part of the electromagnetic steel plate constituting the core plate 24A with elastic protrusions, and as shown in FIGS. 2 and 3, when viewed from the circumferential direction of each core plate 24. It is bent in an arc shape. These plurality of elastic protrusions 28 have a spring property. Further, these plurality of elastic protrusions 28 are subjected to quenching (heat treatment) such as carburizing and quenching.
- the plurality of core plates 24 include core plates 24A with elastic protrusions for each predetermined number arranged in the stacking direction. Then, the core plates 24A with elastic protrusions adjacent to each other in the stacking direction with a predetermined number of core plates 24B without protrusions sandwiched between them are arranged with their phases shifted by a predetermined angle (here, 45 degrees) in the circumferential direction. The number and arrangement of the elastic protrusions 28 can be changed as appropriate.
- the stator core 16 having the above configuration is housed inside the case 14, and a plurality of elastic protrusions 28 are supported (held) by the case 14 in a state of being elastically bent in contact with the inner peripheral surface of the case 14. There is. That is, the stator core 16 is supported with respect to the case 14 by the spring load generated by the plurality of elastic protrusions 28 bent as described above, and is arranged coaxially with respect to the case 14.
- the rigidity when each elastic protrusion 28 is deformed inward in the radial direction of the stator core 16 is set lower than the rigidity when the plate body 26 is deformed inward in the radial direction of the stator core 16.
- the spring load of the plurality of elastic protrusions 28 is set so as not to change significantly due to variations in the inner diameter dimension of the case 14 and the outer diameter dimension of the stator core 16.
- the stator core 16 is configured by laminating a plurality of core plates 24, and is housed in the case 14 of the motor 10.
- the plurality of core plates 24 include a core plate 24A with elastic protrusions in which a plurality of elastic protrusions 28 extending radially outward from the outer peripheral portion and bent in the axial direction are provided side by side in the circumferential direction.
- the stator core 16 is supported by the case 14 in a state where a plurality of elastic protrusions 28 are in contact with the inner peripheral surface of the case 14 and elastically flexed.
- the required fixing force may not be obtained, but in order to prevent this, the dimensional tolerance is designed so that the required fixing force is surely generated. Then, when the maximum tightness allowance is obtained within the variation range, an excessive fixing force is generated due to the excessive tightness allowance, and the compressive stress acting on the yoke portion of the stator core increases, resulting in iron loss. Will increase.
- the stator core 16 is supported by the case 14 by the spring load of a plurality of elastic protrusions 28 provided on the outer peripheral portion of the core plate 24A with elastic protrusions.
- the rigidity when each elastic protrusion 28 is deformed inward in the radial direction of the stator core 16 is set lower than the rigidity when the plate body 26 is deformed inward in the radial direction of the stator core 16.
- the holding force of the stator core 16 can be kept within an appropriate range without significantly changing the radial load applied to the yoke portion 16A of the stator core 16. Is.
- iron loss can be reduced as compared with the conventional case, and the efficiency of the motor 10 can be improved.
- the heat of the stator core 16 generated when the motor 10 is driven can be transferred to the case 14 via the plurality of elastic protrusions 28, and can be dissipated from the case 14 to the outside of the motor 10. That is, the plurality of elastic protrusions 28 function as heat conductive members. Moreover, since a plurality of elastic protrusions 28 are integrally provided on the outer peripheral portion of the core plate 24A with elastic protrusions, the number of parts is reduced as compared with the case where a heat conductive member separate from the core plate 24 is provided. It can contribute to the reduction of manufacturing cost.
- the plurality of elastic protrusions 28 are subjected to quenching such as carburizing and quenching, it is possible to suppress the sagging of each elastic protrusion 28 and improve the durability of each elastic protrusion 28. Can be made to. As a result, even when the magnetic attraction force of the motor 10 is large, the vibration of the stator core is large, or the vibration frequency of the stator core 16 is high, it is possible to suppress the plurality of elastic protrusions 28 from being worn out. Thereby, as in Comparative Example 10'shown in FIG. 4, it is possible to prevent the stator core 16 from being irreversibly eccentric with respect to the case 14 (G1 ⁇ G2 in FIG. 4).
- the stator core 16 and the case 14 are irreversibly eccentric.
- the above magnetic attraction is generated by the eccentricity between 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, so the eccentricity further promotes the eccentricity. become. Due to such eccentricity, the sagging of each elastic protrusion 28 becomes a problem, but in the present embodiment, the sagging of each elastic protrusion 28 can be suppressed by the above quenching.
- FIG. 5 shows a partial configuration of the motor according to the second embodiment of the present invention in a cross-sectional view corresponding to FIG.
- This embodiment has basically the same configuration as that of the first embodiment, but a plurality of inward elastic protrusions 28A are provided side by side in the circumferential direction on the outer peripheral portion of the core plate 24A with elastic protrusions. There is. Similar to the elastic protrusion 28 according to the first embodiment, these inward elastic protrusions 28A extend outward in the radial direction of the plate body 26 and are bent to one side in the axial direction of each core plate 24. It has a structure that is bent in two stages.
- each inward elastic projection 28A On the tip end side of each inward elastic projection 28A, a curved portion 29 having a bending radius smaller than that of the base end side of each inward elastic projection 28A is formed, and each inward elastic projection 28A is formed. Is bent so that the tip portion of the core plate 24A with elastic protrusions faces inward in the radial direction.
- the tip portions of the inward elastic protrusions 28A are arranged apart from the outer peripheral surface of the stator core 16. Further, within the range of dimensional variation that occurs in the case 14 and the stator core 16, the tip portions of the inward elastic protrusions 28A are configured so as not to come into contact with the outer peripheral surface of the stator core 16.
- the configurations other than the above are the same as those in the first embodiment. Therefore, in this embodiment as well, basically the same effects as those in the first embodiment can be obtained.
- the amount of bending of the inward elastic projection 28A located in the displacement direction increases.
- the tip of the inward elastic projection 28A comes into contact with the outer peripheral surface of the stator core 16, and the spring constant of the inward elastic projection 28A increases (changes).
- the displacement of the stator core 16 can be suppressed, and the inward elastic projection 28A can be prevented from being plastically deformed.
- the irreversible eccentricity of the stator core 16 as shown in FIG. 4 can be prevented.
- the stator core 16 is subjected to the spring load of the plurality of elastic projections 28. It is supported by the case 14. As a result, it is possible to prevent or effectively suppress the generation of compressive stress in the yoke portion 16A of the stator core 16, so that iron loss can be reduced as compared with the conventional case. Further, since the elastic bending of the plurality of elastic protrusions 28 can absorb the dimensional variation of the case 14 and the stator core 16, the dimensional accuracy can be easily controlled.
- FIG. 6 shows a partial configuration of the motor according to the third embodiment of the present invention in a cross-sectional view corresponding to a part of FIG.
- This embodiment has basically the same configuration as that of the first embodiment, but a plurality of grooves 30 into which a plurality of elastic protrusions 28 are inserted (fitted) are inserted (fitted) into the inner peripheral surface of the case 14 (FIG. 6). (Only one is shown) are formed side by side in the circumferential direction. These plurality of grooves 30 extend in the axial direction of the case 14. The depths of these plurality of grooves 30 are set so that an annular gap 32 is formed between the inner peripheral surface of the case 14 and the outer peripheral surface of the stator core 16.
- each groove 30 is set to be the same as the width of each elastic protrusion 28.
- a part of the outer peripheral surface of the stator core 16 is one of the inner peripheral surfaces of the case 14 within the range where the plurality of elastic protrusions 28 are elastically deformed. It is configured to come into contact with the part.
- the configurations other than the above are the same as those in the first embodiment. Therefore, in this embodiment as well, basically the same effects as those in the first embodiment can be obtained.
- the plurality of elastic protrusions 28 of the stator core 16 are inserted into the plurality of grooves 30 of the case 14. As a result, the rotational torque generated when the motor 10 is driven can be supported by the engaging portions of the plurality of elastic protrusions 28 and the plurality of grooves 30.
- the relative rotation of the stator core 16 with respect to the case 14 in the circumferential direction can be regulated without using a detent component such as a key.
- the gap 32 is provided between the outer peripheral surface of the case 14 and the outer peripheral surface of the stator core 16, it is possible to absorb the dimensional variation of the case 14 and the stator core 16. Further, in this embodiment, when the stator core 16 is displaced in the radial direction with respect to the case 14, a part of the outer peripheral surface of the stator core 16 comes into contact with a part of the inner peripheral surface of the case 14, so that the stator core 16 is described above. Displacement is regulated. Since this state is within the range in which the plurality of elastic protrusions 28 are elastically deformed, it is possible to prevent the plurality of elastic protrusions 28 from being plastically deformed. As a result, the irreversible eccentricity of the stator core 16 as shown in FIG. 4 can be prevented.
- FIG. 7 shows a partial configuration of the motor according to the fourth embodiment of the present invention in a cross-sectional view corresponding to FIG.
- This embodiment has basically the same configuration as that of the first embodiment, but the plurality of core plates 24 are provided with a plurality of plano protrusions 34 extending radially outward from the outer peripheral portion side by side in the circumferential direction.
- a plurality of planed core plates 24C are included.
- the core plate 24C with flat protrusions has a plate main body 26 having the same configuration as the core plate 24B without protrusions, and a plurality of flat protrusions 34 extending from the outer peripheral portion of the plate main body 26.
- the tip portions of the plurality of plano protrusions 34 are arranged so as to face the inner peripheral surface of the case 14 with a gap.
- the configurations other than the above are the same as those in the first embodiment. Therefore, in this embodiment as well, basically the same effects as those in the first embodiment can be obtained. Moreover, in this embodiment, when the stator core 16 is displaced in the radial direction with respect to the case 14, the tip end portion of the plano protrusion 34 comes into contact with the inner peripheral surface of the case 14, and the stator core 16 is displaced, that is, the plurality of elastic protrusions 28 are deformed. Can be regulated. As a result, it is possible to prevent the plurality of elastic protrusions 28 from being plastically deformed.
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Abstract
Description
以下、図1~図4を用いて、本発明の第1実施形態に係るモータ10について説明する。図1に示されるように、本実施形態に係るモータ10は、ステータユニット12内にロータコア18が設けられたインナーロータ型とされている。ステータユニット12は、有底筒状に形成されたケース14と、該ケース14内に収容されたステータコア16とを有している。
次に、本実施形態の作用及び効果について説明する。
図5には、本発明の第2実施形態に係るモータの部分的な構成が図3に対応した断面図にて示されている。この実施形態は、第1実施形態と基本的に同様の構成とされているが、弾性突起付きコアプレート24Aの外周部には、複数の内向き弾性突起28Aが周方向に並んで設けられている。これらの内向き弾性突起28Aは、第1実施形態に係る弾性突起28と同様に、プレート本体26の径方向の外側へ延びると共に、各コアプレート24の軸方向の一方側へ曲がっているが、二段階に曲げられた構成になっている。具体的には、各内向き弾性突起28Aの先端部側には、各内向き弾性突起28Aの基端部側よりも曲げ半径が小さい曲部29が形成されており、各内向き弾性突起28Aは、先端部が弾性突起付きコアプレート24Aの径方向内側を向くように曲がっている。各内向き弾性突起28Aの先端部は、ステータコア16の外周面に対して離間して配置されている。また、ケース14及びステータコア16に生じる寸法ばらつきの範囲内では、各内向き弾性突起28Aの先端部がステータコア16の外周面に接触しないように構成されている。
図6には、本発明の第3実施形態に係るモータの部分的な構成が図1の一部に対応した断面図にて示されている。この実施形態は、第1実施形態と基本的に同様の構成とされているが、ケース14の内周面には、複数の弾性突起28が挿入(嵌入)される複数の溝30(図6では一つのみ図示)が周方向に並んで形成されている。これら複数の溝30は、ケース14の軸線方向に延在している。これら複数の溝30の深さは、ケース14の内周面とステータコア16の外周面との間に環状の隙間32が形成されるように設定されている。また、各溝30の幅は、各弾性突起28の幅と同等に設定されている。この実施形態において、ステータコア16がケース14に対して径方向に変位した場合、複数の弾性突起28が弾性変形する範囲内で、ステータコア16の外周面の一部がケース14の内周面の一部に接触するように構成されている。
図7には、本発明の第4実施形態に係るモータの部分的な構成が図3に対応した断面図にて示されている。この実施形態は、第1実施形態と基本的に同様の構成とされているが、複数のコアプレート24には、外周部から径方向外側へ延びる複数の平突起34が周方向に並んで設けられた複数の平突起付きコアプレート24Cが含まれている。平突起付きコアプレート24Cは、突起無しコアプレート24Bと同様の構成とされたプレート本体26と、プレート本体26の外周部から延出された複数の平突起34とを有している。複数の平突起34の先端部は、ケース14の内周面に対して間隙を隔てて対向して配置されている。
Claims (8)
- 複数のコアプレートが積層されて構成され、モータのケース内に収容されるステータコアであって、
前記複数のコアプレートには、外周部から径方向外側へ延びて軸方向に曲がった複数の弾性突起が周方向に並んで設けられた弾性突起付きコアプレートが含まれており、
前記複数の弾性突起が前記ケースの内周面に接触して弾性的に撓んだ状態で前記ケースに支持されるステータコア。 - 前記複数の弾性突起には、先端部が前記弾性突起付きコアプレートの径方向内側を向くように曲がった内向き弾性突起が含まれている請求項1に記載のステータコア。
- 前記複数の弾性突起には、焼入れが施されている請求項1又は請求項2に記載のステータコア。
- 前記複数のコアプレートには、外周部から径方向外側へ延びる複数の平突起が周方向に並んで設けられた平突起付きコアプレートが含まれており、
前記複数の平突起の先端部が前記ケースの内周面に対して間隙を隔てて対向して配置される請求項1~請求項3の何れか1項に記載のステータコア。 - モータのケースと、
前記ケース内に収容された請求項1~請求項4の何れか1項に記載のステータコアと、
を有するステータユニット。 - 前記ケースの内周面には、前記複数の弾性突起が挿入される複数の溝が周方向に並んで形成されており、前記ケースの内周面と前記ステータコアの外周面との間には隙間が設けられている請求項5に記載のステータユニット。
- 前記ステータコアが前記ケースに対して径方向に変位した場合、前記複数の弾性突起が弾性変形する範囲内で、前記ステータコアの外周面の一部が前記ケースの内周面の一部に接触する請求項6に記載のステータユニット。
- 請求項5~請求項7の何れか1項に記載のステータユニットと、
前記ステータユニットが有するステータコアの内側に収容されたロータコアと、
を備えたモータ。
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