CN112787430B - Rotary electric machine - Google Patents
Rotary electric machine Download PDFInfo
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- CN112787430B CN112787430B CN202011155421.3A CN202011155421A CN112787430B CN 112787430 B CN112787430 B CN 112787430B CN 202011155421 A CN202011155421 A CN 202011155421A CN 112787430 B CN112787430 B CN 112787430B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 239000002184 metal Substances 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 34
- 238000003466 welding Methods 0.000 claims description 7
- 238000005219 brazing Methods 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 description 12
- 238000003754 machining Methods 0.000 description 11
- 238000003475 lamination Methods 0.000 description 10
- 239000000853 adhesive Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000004323 axial length Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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
- H02K1/16—Stator cores with slots for windings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
A rotating electrical machine of the present invention is provided with metal end plates (101, 102) having a thickness greater than that of an electromagnetic steel plate at both axial ends of a stator core (11), the end plates (101, 102) comprising: a main body portion (106) provided with a dividing portion (104) extending in the radial direction at least at 1 in the circumferential direction; and a thin portion (107) which is disposed in the dividing portion (104) and is coupled to the main body portion (106).
Description
Technical Field
The present application relates to a rotating electrical machine.
Background
A rotary electric machine is known that includes an armature coil in a stator and a field pole in a rotor. When the rotating electric machine operates as a motor, the stator generates a rotating magnetic field by ac power supplied to the armature coils, and the rotor rotates. A stator of a rotating electrical machine is provided with a stator core formed with a plurality of slots for accommodating coil conductors of armature coils. The stator core is configured by arranging a plurality of split cores formed by laminating a plurality of thin-plate-shaped electromagnetic steel plates that are press-formed into a predetermined shape in a plurality of rings, or by laminating a plurality of thin-plate-shaped electromagnetic steel plates that are press-formed integrally in advance into a ring.
The stator core is configured by integrally fixing a plurality of laminated electromagnetic steel sheets by, for example, caulking by driving a metal mold into a metal mold, or by means of an adhesive. The annular stator core thus configured is fixed to the housing by shrink-fitting or press-fitting the annular stator core to the inner peripheral surface portion of the housing of the stator. The rotor fixed to the shaft is inserted into a space provided in the stator core. The shaft is rotatably supported by the housing of the stator via a bearing.
In recent years, although a reduction in size and a high output of a rotating electrical machine have been demanded, as a countermeasure for the reduction in the output of the rotating electrical machine, an electromagnetic steel sheet has been further reduced in thickness. However, since the thickness of the electromagnetic steel sheet is reduced and the strength of the stator core is reduced, when the stator core is shrink-fitted or press-fitted to the inner peripheral surface portion of the housing to be fixed, there is a possibility that the fastening stress to the stator core by the housing causes deformation due to bending of the stress concentration portion of the stator core, or the electromagnetic steel sheet is peeled off at the end portion in the lamination direction of the electromagnetic steel sheet. Further, in the case where a flange for fixing the rotating electric machine to a structural body of a vehicle or the like is attached to the housing, a portion where compressive stress is locally concentrated may be formed on the housing, and the stator core fixed to the inner peripheral surface portion of the housing may be deformed.
Patent document 1 discloses a rotary electric machine including: annular regulating members for regulating deformation in the axial direction of the stator core are attached to both axial end portions of the stator core, and the regulating members are fixed to the housing together with the stator core by shrink fit or press fit, whereby fastening stress to the stator core generated by the housing is suppressed. Further, patent document 2 discloses a rotary electric machine as follows: the outer diameter of the stator core is set to be equal to or smaller than the inner diameter of the housing, and the stator core is clamped by a fixing member fixed to the housing, so that deformation or strain of the stator core during shrink fitting or press fitting is suppressed.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2012-143064
Patent document 2: japanese patent laid-open No. 2010-226932
Disclosure of Invention
Technical problem to be solved by the invention
According to the conventional rotary electric machine disclosed in patent document 1, deformation due to bending of the stator core at the time of shrink fitting or press fitting of the housing of the stator core, peeling of the electromagnetic steel plate at the axial end portion of the stator core, and the like can be suppressed by the restricting members provided at the axial end portions of the stator core. However, in order to limit buckling of the stator core by the restricting member provided at the end portion in the axial direction of the stator core, the outer peripheral surface portion of the restricting member and the outer peripheral surface portion of the stator core must be in contact with the inner peripheral surface portion of the housing, and the outer diameter of the stator core needs to be identical to the outer diameter of the restricting member.
The electromagnetic steel sheet constituting the stator core is formed to have a small plate thickness, and thus can be processed with high precision, however, since the restricting member has a plate thickness larger than that of the electromagnetic steel sheet, it is difficult to perform processing with high precision on the restricting member as is performed on the electromagnetic steel sheet. Therefore, in the conventional rotating electrical machine disclosed in patent document 1, it may be difficult to match the outer diameter size of the regulating member with the outer diameter size of the stator core, and it may be difficult to suppress deformation or peeling of the electromagnetic steel plate due to buckling of the stator core. Further, in order to improve the processing accuracy of the restriction member, the manufacturing cost will increase, thereby becoming high cost.
Further, in the case where the stator core is configured by a plurality of divided cores, there is a variation in the height of the electromagnetic steel sheets in the stacking direction between the plurality of divided cores, and therefore, when the plurality of divided cores are arranged in the circumferential direction to configure the annular stator core, there is a case where the axial length varies at different positions in the circumferential direction of the annular stator core. Therefore, when the restricting member integrally formed in an annular shape is fixed to the axial end portion of the stator core formed of the plurality of divided cores, a gap may be generated between the restricting member and the stator core, and it is difficult to suppress deformation due to buckling of the stator core or peeling of the electromagnetic steel plate.
In the conventional rotary electric machines disclosed in patent documents 1 and 2, when the degree of roundness of the stator core is low or when the stator core is formed of a plurality of divided cores in a ring shape and has a variation in the axial length as described above, there is a possibility that a portion where the stator core does not contact the restricting member or the fixing member is generated, and it is difficult to suppress deformation of the stator core at the time of shrink fit or at the time of press fitting.
The present application has been made to solve the above-described problems, and an object of the present application is to provide a rotary electric machine capable of suppressing deformation due to buckling of a stator core and peeling of laminated electromagnetic steel sheets, which are generated when the stator core of the rotary electric machine is shrink-fitted or press-fitted into a casing.
Technical proposal adopted for solving the technical problems
The rotating electrical machine according to the present application is characterized by comprising:
A housing formed in a cylindrical shape;
an annular stator core which is fixed to an inner peripheral surface portion of the housing by shrink fitting or press fitting, and in which a plurality of electromagnetic steel plates are stacked in an axial direction; and
A metal end plate disposed at both axial ends of the stator core and having a plate thickness larger than that of the electromagnetic steel plate,
The end plate includes: a main body portion having a dividing portion extending in a radial direction at least at 1 in a circumferential direction; and a thin portion disposed in the dividing portion and coupled to the main body portion.
Effects of the invention
According to the rotating electrical machine of the present application, the following rotating electrical machine can be obtained: deformation of the stator core due to buckling and peeling of the laminated electromagnetic steel sheets, which are generated when the stator core is shrink-fitted or press-fitted into the inner peripheral surface portion of the housing, can be suppressed.
Drawings
Fig. 1 is a perspective view showing a structure of a rotary electric machine according to embodiment 1.
Fig. 2 is a cross-sectional view showing the structure of the rotating electrical machine according to embodiment 1.
Fig. 3 is a plan view showing an end plate of the rotating electrical machine according to embodiment 1.
Fig. 4 is a plan view showing a state in which a stator core and an end plate are fixed to a casing in the rotating electrical machine according to embodiment 1.
Fig. 5 is a plan view showing a stator core of a rotary electric machine according to embodiment 2.
Fig. 6 is a plan view showing another example of a stator core of a rotary electric machine according to embodiment 2.
Fig. 7 is a plan view showing an end plate of a rotary electric machine according to embodiment 2.
Fig. 8 is a plan view showing a stator core of a rotary electric machine according to embodiment 3.
Fig. 9 is a plan view showing an end plate of a rotary electric machine according to embodiment 3.
Fig. 10 is a plan view showing a stator core and an end plate of the rotating electrical machine according to embodiment 4.
Detailed Description
Embodiment 1.
Fig. 1 is a perspective view showing the structure of a rotary electric machine according to embodiment 1, and fig. 2 is a cross-sectional view showing the structure of the rotary electric machine according to embodiment 1. The stator core of the rotating electrical machine according to embodiment 1 is configured by arranging a plurality of split cores in a ring shape. In fig. 1 and 2, a rotary electric machine 1 includes a stator 2 and a rotor 3. The stator 2 includes a stator core 7 formed by arranging 48 divided cores 11 in a ring shape, a casing 4 formed in a cylindrical shape, a stator coil 8 as an armature coil attached to the stator core 7, and a pair of brackets (not shown).
The split core 11 is constituted by: the laminated electromagnetic steel sheets are integrally fixed to the laminated block by pressing the electromagnetic steel sheets having a sheet thickness of about 0.2 to 0.5 mm into a predetermined shape by press working, laminating the electromagnetic steel sheets obtained by the pressing to form the laminated block, and by means of "drilling and riveting" or an adhesive agent by which a metal mold is driven to be riveted. The number of split cores constituting the stator core 7 is not limited to 48.
The stator core 7 formed by arranging a plurality of divided cores in a ring shape is inserted and fixed to the inner peripheral surface portion of the housing 4 by shrink fitting or press fitting so that the outer peripheral surface portion of the core back portion thereof abuts against the inner peripheral surface portion of the housing 4. Annular metal end plates 101 and 102 described later are disposed at both ends of the stator core 7 in the axial direction. The end plates 101, 102 are inserted and fixed to the inner peripheral surface portion of the housing 4 together with the stator core 7 by shrink fitting or press fitting.
The coil conductors constituting the stator coil 8 are formed in a rectangular or circular shape in cross section. The coil conductors are inserted into slots formed between adjacent teeth of the stator core 7.
The rotor 3 is rotatably supported by a pair of brackets (not shown) of the stator 2 via bearings 61, 62 fixed to the shaft 5. The rotor 3 has a rotor core 9 fixed to the shaft 5 by press fitting or the like. The rotor core 9 is formed by stacking electromagnetic steel plates formed in a thin plate shape, and includes a plurality of permanent magnets (not shown) housed in holes penetrating in the stacking direction of the electromagnetic steel plates. The plurality of permanent magnets are arranged at equal intervals in the circumferential direction of the rotor core 9, and constitute excitation poles, respectively. The rotary core 9 of the rotor 3 is disposed in the inner space portion of the stator core 7, and the outer peripheral surface portion thereof faces the inner peripheral surface portion of the stator core 7 via the gap.
The rotating electrical machine 1 configured as described above generates a rotating magnetic field in the stator 2 by supplying three-phase ac power to the stator coil 8, for example, and rotates the rotor 3 by interaction between magnetic fluxes generated by the field poles provided in the rotor 3 and the rotating magnetic field.
Next, the end plates 101 and 102 will be described. Fig. 3 is a plan view showing an end plate of the rotary electric machine according to embodiment 1, and fig. 4 is a plan view showing a state in which a stator core and an end plate are fixed to a housing in the rotary electric machine according to embodiment 1. In fig. 3 and 4, the end plates 101 and 102 are fixed to both axial ends of the stator core 7, that is, both ends in the lamination direction of the electromagnetic steel sheets, by welding or an adhesive.
The end plates 101, 102 include: a body portion 106, the body portion 106 being divided into 48 pieces by a dividing portion 104 at 48 extending radially in the circumferential direction; and 48 thin portions 107, the thin portions 107 being disposed in the respective divided portions 104. The planar shape of the body 106 is the same as the planar shape of the split core 11, but the width of the tooth 103 in the circumferential direction is smaller than the width of the tooth (not shown) of the split core 11 in the stator core 7. The body portions 106 of the end plates 101, 102 have a plate thickness larger than that of the electromagnetic steel plates constituting the stator core 7.
The thin portions 107 of the end plates 101, 102 have a plate thickness smaller than that of the body portion 106, and extend from the outer peripheral portions of the end plates 101, 102 to the bottoms of the groove portions 105 in the radial direction of the end plates 101, 102. The body 106 and the thin portion 107 are integrally formed of, for example, the same metal material, and are connected to each other.
The body 106 and the thin portion 107 may be formed by being divided separately, and the divided body 106 and thin portion 107 may be alternately arranged in a ring shape, and the ring-shaped end plates 101 and 102 may be formed as a whole. In this case, the divided body 106 and the thin wall 107 are formed as annular end plates 101, 102, for example, by welding or brazing at 1 in the radial direction of the end plates 101, 102. In this way, when the body 106 and the thin portion 107 divided into a plurality of segments are connected to each other to form the annular end plates 101 and 102, the yield of the material is improved and the material cost can be reduced as compared with the case where the body 106 and the thin portion 107 are integrally formed into an annular shape with the same material.
In the end plates 101 and 102, the body portions 106 are arranged corresponding to the split cores 11 of the stator core 7, and the split portions 104 and the thin portions 107 are arranged corresponding to the split portions of the stator core 7.
The outer dimension of the stator core 7 is formed larger than the inner diameter dimension of the housing 4 formed in a cylindrical shape, and an interference of about 0.1 to 0.4 mm is provided to the stator core 7, for example. The annular stator core 7 is inserted into the inner peripheral surface portion of the housing 4 by a shrink fit or press fit process, and is fixed to the housing 4. At this time, since the radial tightening stress is applied to the stator core 7 and the divided cores 11 are arranged in a ring shape at the same time, the pressing stress generated by the above-described interference is applied to the stator core 7, the adjacent divided cores 11 are subjected to the reaction force in the circumferential direction at the portions where they are abutted against each other.
When the stator core 7 is inserted into the inner peripheral surface portion of the housing 4 by shrink fitting or press fitting, if the adhesive strength or caulking strength between the lamination layers of the electromagnetic steel plates constituting the stator core 7 is insufficient, the smaller the thickness of the electromagnetic steel plates is, the lower the rigidity of the split core 11 constituted as the lamination body of the electromagnetic steel plates is, and therefore, the bending becomes easy due to the reaction force in the circumferential direction of the stator core 7. Therefore, from the viewpoint of rigidity of the split core 11, further reduction in thickness of the electromagnetic steel sheet is not preferable in order to improve performance of the rotating electrical machine.
Therefore, in order to suppress deformation due to buckling of the stator core 7 or peeling of the laminated electromagnetic steel sheets, the annular end plates 101, 102 are fixed to both end portions of the stator core 7 in the lamination direction of the electromagnetic steel sheets, that is, both end portions in the axial direction of the stator core 7. In order to suppress buckling of the stator core 7, the outer peripheral surface portions of the end plates 101, 102 need to be in contact with the inner peripheral surface portion of the housing 4. Therefore, conventionally, the outer diameter of the stator core 7 needs to be equal to the outer diameter of the end plates 101 and 102. However, the thickness of the electromagnetic steel sheet is small and high-precision machining is possible, and on the other hand, the thickness of the end plates 101, 102 is larger than the thickness of the electromagnetic steel sheet, so that in order to match the outer diameter dimensions of the end plates 101, 102 with the outer diameter dimensions of the stator core 7, high-precision machining of the end plates 101, 102 is required to compensate for the difference in machining precision due to the difference in thickness.
Further, since the height of the split cores 11 in the stacking direction of the electromagnetic steel sheets varies between the split cores 11, the axial length of the annular stator core 7 varies between different positions in the circumferential direction of the stator core 7. Therefore, in the stator core 7 configured by arranging the plurality of divided cores 11 in a ring shape, when the integrally formed single end plates 101, 102 are fixed to both axial end portions of the stator core 7, the end plates 101, 102 cannot absorb the variation in height in the stacking direction between the plurality of divided cores 11, and therefore, a gap is generated between the stator core 7 and the end plates 101, 102, and the effect of suppressing buckling of the stator core 7 by the end plates 101, 102 may not be obtained.
According to the rotating electrical machine of embodiment 1 of the present application, since the end plates 101 and 102 include the body portion 106 divided by the dividing portion 104 extending in the radial direction and the thin portion 107 provided in the dividing portion 104 and connected to the body portion 106, the body portion 106 is configured to have a plate thickness larger than that of the electromagnetic steel plate, even if there is a difference in the outer diameter dimension of the stator core and the outer diameter dimension of the end plates 101 and 102 due to a difference in the processing accuracy based on the difference in the plate thicknesses of the stator core 7 and the end plates 101 and 102, the difference in the outer diameter dimension can be absorbed by bending of the thin portion 107.
As a result, the outer peripheral surfaces of the end plates 101, 102 can be fixed by shrink fitting or press fitting while being in contact with the inner peripheral surface of the housing 4, as in the case of the stator core 7. Therefore, machining of the end plates 101 and 102 is not required to be performed with high precision, and the machining cost can be reduced. Further, by disposing the thin portions 107 of the end plates 101, 102 at positions corresponding to the divided portions of the stator core 7, it is possible to absorb the variation in the height of the respective divided cores 11 in the stacking direction by bending of the thin portions 107, and therefore, it is possible to reliably abut and fix the end plates 101, 102 against the axially opposite end surface portions of the stator core 7, so that buckling of the stator core 7 can be suppressed.
Embodiment 2.
Fig. 5 is a plan view showing a stator core of a rotary electric machine according to embodiment 2, fig. 6 is a plan view showing another example of a stator core of a rotary electric machine according to embodiment 2, and fig. 7 is a plan view showing an end plate of a rotary electric machine according to embodiment 2. The stator core 7 of the rotating electrical machine according to embodiment 2 shown in fig. 5 is configured by arranging 24 divided cores 11 in a ring shape. Each divided core 11 includes 2 teeth 111. The end plates 101 and 102 shown in fig. 7 are fixed to both axial ends of the stator core 7 shown in fig. 5, that is, both ends in the lamination direction of the electromagnetic steel plates.
As shown in fig. 7, the end plates 101 and 102 include 24 main body portions 106 divided by the dividing portions 104 at 24 positions, and 24 thin portions 107 arranged in the respective dividing portions 104. The planar shape of the body 106 is the same as the planar shape of the split core 11, but the width of the tooth 103 in the circumferential direction is smaller than the width of the tooth 111 of the split core 11 in the stator core 7. The body portions 106 of the end plates 101, 102 have a plate thickness larger than that of the electromagnetic steel plates constituting the stator core 7.
The thin-walled portions 107 in the end plates 101, 102 extend from the outer peripheral surface portions of the end plates 101, 102 to the bottoms of the groove portions 105 in the radial direction of the end plates 101, 102. The body 106 and the thin portion 107 are integrally formed of, for example, the same metal material, and are connected to each other.
The body 106 and the thin portion 107 may be formed by being divided separately, and the divided body 106 and thin portion 107 may be arranged in a ring shape, and the ring-shaped end plates 101 and 102 may be formed as a whole. In this case, the divided body 106 and the thin wall 107 are formed as annular end plates 101, 102, for example, by welding or brazing at 1 in the radial direction of the end plates 101, 102. In this way, when the body 106 and the thin portion 107 divided into a plurality of segments are connected to each other to form the annular end plates 101 and 102, the yield of the material is improved and the material cost can be reduced as compared with the case where the body 106 and the thin portion 107 are integrally formed into an annular shape with the same material.
In the end plates 101 and 102, the body portions 106 are arranged corresponding to the split cores 11 of the stator core 7, and the split portions 104 and the thin portions 107 are arranged corresponding to the split portions of the stator core 7. The end plates 101 and 102 are fixed to both axial end portions of the stator core 7 by welding or an adhesive.
A stator core of a rotary electric machine according to embodiment 2 shown in fig. 6 is configured by arranging 4 divided cores 11 in a ring shape. Each divided core 11 includes 12 teeth 111. Each end plate (not shown) is fixed to both axial ends of the stator core 7 shown in fig. 6, that is, both ends of the electromagnetic steel plates in the stacking direction. The end plate in this case includes 4 main body portions having the same shape as the split core 11 shown in fig. 6, split portions at 4, and 4 thin portions disposed in the split portions. The main body portion includes 12 tooth portions. The other structure of the end plate and the arrangement of the end portions in the axial direction of the stator core 7 are the same as those of the end plates 101 and 102 shown in fig. 7.
According to the rotating electrical machine of embodiment 2, by disposing the thin portions 107 of the end plates 101, 102 at the portions corresponding to the divided portions of the stator core 7, the difference in machining accuracy due to the plate thickness difference between the stator core 7 and the end plates 101, 102 can be absorbed as in the case of embodiment 1, and high-accuracy machining for matching the outer diameter dimensions of the end plates 101, 102 and the stator core 7 is not required, so that the machining cost can be reduced. Further, since the thin portions 107 of the end plates 101 and 102 can absorb the variation in the height of the split cores 11 in the stacking direction, the end plates 101 and 102 can be reliably fixed to the stator core 7, and the buckling of the stator core 7 can be suppressed. The number of divided cores and the number of divided end plates are not limited to the above.
Embodiment 3.
Fig. 8 is a plan view showing a stator core of a rotary electric machine according to embodiment 3, and fig. 9 is a plan view showing an end plate of the rotary electric machine according to embodiment 3. As shown in fig. 8, a stator core 7 of a rotating electrical machine according to embodiment 3 is formed by stacking electromagnetic steel plates integrally formed in a ring shape, and has a plurality of teeth 111 in an inner peripheral portion. End plates 101 and 102 shown in fig. 9 are fixed to both axial end portions of the integrally formed stator core 7.
As shown in fig. 9, in the end plates 101 and 102, a divided portion 104 is provided at 1 in the circumferential direction of the annular body portion 106, and the divided portion 104 is provided with a thin portion 107. The circumferential width of the tooth 103 of the body 106 of the end plates 101, 102 is formed smaller than the circumferential width of the tooth 111 of the stator core 7. The body portions 106 of the end plates 101, 102 have a plate thickness larger than that of the electromagnetic steel plates constituting the stator core 7.
The thin-walled portions 107 in the end plates 101, 102 extend from the outer peripheral surface portions of the end plates 101, 102 to the bottoms of the groove portions 105 in the radial direction of the end plates 101, 102. The body 106 and the thin portion 107 are integrally formed of, for example, the same metal material, and are connected to each other.
The body 106 and the thin portion 107 may be divided into separate parts. In this case, the divided body 106 and the thin portion 107 are connected to each other by welding or brazing, for example, at 1 in the radial direction of the end plates 101, 102. Thus, if the main body 106 and the thin portion 107 are formed separately, the yield of the material is improved and the material cost can be reduced as compared with the case where the main body 106 and the thin portion 107 are integrally formed in a ring shape using the same material.
Even if the stator core 7 is integrally formed, when the laminated electromagnetic steel sheets have a small thickness, the stator core 7 has a low rigidity, and when the stator core is fixed to the housing 4 by shrink fitting or press fitting, deformation of the electromagnetic steel sheets due to press-fitting stress or curling of the electromagnetic steel sheets at the end face portions in the lamination direction of the stator core 7 may occur. According to the structure of the rotating electrical machine according to embodiment 3, since the end plates 101 and 102 are provided with 1 thin portion 107 as described above, the thin portion 107 bends when shrink-fitted or press-fitted into the housing 4, and the deviation in the outer diameter dimension due to the difference in machining accuracy between the plate thickness of the main body portion 106 of the end plates 101 and 102 and the plate thickness of the electromagnetic steel plate constituting the stator core 7 is absorbed.
Therefore, the outer peripheral surface portions of the end plates 101 and 102 come into contact with the inner peripheral surface portion of the housing 4 together with the outer peripheral surface portion of the stator core 7, and deformation of the electromagnetic steel plate due to the press-in stress and curling of the electromagnetic steel plate at the end surface portion in the lamination direction of the stator core 7 can be prevented.
In the rotary electric machine according to embodiment 3, the stator core 7 is integrally configured, and therefore, the variation in height in the lamination direction does not occur at different positions in the circumferential direction of the stator core 7. Therefore, the position of the thin-walled portion 107 in the end plates 101, 102 may be any position with respect to the stator core 7.
The end plates 101 and 102 shown in fig. 9 are shown to include 1 divided portion 104 and 1 thin portion, but may include 2 or more divided portions 104 and 2 or more thin portions 107.
Embodiment 4.
Fig. 10 is a plan view showing a stator core and an end plate of the rotating electrical machine according to embodiment 4. In fig. 10, as in the case of embodiment 1, the stator core 7 is configured by arranging 48 divided cores 11 in a ring shape, and each divided core 11 includes a core back 112 and teeth 111. The end plates 101 and 102 fixed to both axial ends of the stator core 7 include 48 divided portions 104 at 48 main portions 106 and 48, and 48 thin portions 107 arranged at the divided portions 104. The body portions 106 of the end plates 101, 102 do not have tooth portions corresponding to the tooth portions 111 of the split cores 11, and have shapes corresponding only to the core back portions 112 of the split cores 11.
The body portions 106 of the end plates 101, 102 have a plate thickness larger than that of the electromagnetic steel plates constituting the stator core 7. The thin portions 107 of the end plates 101, 102 extend from the outer peripheral surface portions to the inner peripheral surface portions of the end plates 101, 102 in the radial direction of the end plates 101, 102. The body 106 and the thin portion 107 are integrally formed of, for example, the same metal material, and are connected to each other.
The body 106 and the thin portion 107 may be separately divided. In this case, the divided body 106 and the thin portion 107 are connected to each other by welding or brazing, for example, at 1 in the radial direction of the end plates 101, 102. Thus, if the main body 106 and the thin portion 107 are formed separately, the yield of the material is improved and the material cost can be reduced as compared with the case where the main body 106 and the thin portion 107 are integrally formed in a ring shape using the same material.
As shown in fig. 10, the end plates 101 and 102 configured as described above are arranged so as to cover the core back 112 of the split core 11 of the stator core 7 and are fixed to the stator core 7. The divided portions 104 and the thin portions 107 of the end plates 101 and 102 are arranged at positions corresponding to the divided portions of the stator core 7. The teeth 111 of the split core 11 in the stator core 7 are exposed and not covered with the end plates 101 and 102.
According to the rotary electric machine of embodiment 4, as in the rotary electric machines of the above embodiments, since the end plates 101 and 102 are provided with the thin-walled portions 107, the thin-walled portions 107 bend upon shrink-fitting or press-fitting into the housing 4, and the deviation in the outer diameter dimension due to the difference in machining accuracy between the plate thickness of the main body portion 106 of the end plates 101 and 102 and the plate thickness of the electromagnetic steel plates constituting the stator core 7 is absorbed.
Therefore, the outer peripheral surface portions of the end plates 101 and 102 come into contact with the inner peripheral surface portion of the housing 4 together with the outer peripheral surface portion of the stator core 7, and deformation of the electromagnetic steel plates due to the press-in stress and curling of the electromagnetic steel plates in the end surface portions in the lamination direction of the stator core 7 can be prevented.
Further, according to the rotating electrical machine of embodiment 4, since the end plates 101 and 102 are formed in the shape that covers only the core back portion of the electromagnetic steel plate of the stator core 7, the end plates 101 and 102 can be made lightweight, and the shape of the end plates 101 and 102 can be made in a simple ring shape, so that the machining cost can be reduced. Further, since the end plates 101 and 102 have shapes corresponding only to the core back portions which are farther from the rotor and have small changes in magnetic flux density, an increase in core loss due to the end plates 101 and 102 having a larger plate thickness than the electromagnetic steel plates can be suppressed.
The conventional rotating electric machine disclosed in patent document 2 has the following structure: however, in the case of the stator core fixed to the housing by the clamping of the fixing member alone, there is a possibility that the position of the stator core in the housing may be changed to increase noise or vibration of the rotating electric machine, but in the rotating electric machine according to the present application, the stator core is fixed to the inner peripheral surface portion of the housing by shrink-fitting or press-fitting together with the end plate, and therefore, the position of the stator core in the housing does not change, and noise or vibration of the rotating electric machine can be prevented.
While various exemplary embodiments and examples have been described, the various features, aspects and functions described in 1 or more embodiments are not limited to being applicable to the specific embodiments, and can be applied to the embodiments alone or in various combinations. Accordingly, numerous modifications, not illustrated, are contemplated as falling within the scope of the disclosed technology. For example, the case where at least 1 component is modified, added, or omitted, and the case where at least 1 component is extracted and combined with the components of the other embodiments are also included.
Description of the reference numerals
1. The electric motor is rotated by the electric motor,
2. The stator is provided with a plurality of slots,
3. The rotor is provided with a plurality of grooves,
4. The outer shell of the shell is provided with a plurality of grooves,
5. The axis of the shaft is provided with a plurality of grooves,
61. The bearing 62 is provided with a bearing,
7. The stator core is provided with a plurality of stator cores,
8. The stator coil is arranged in a circular shape,
9. The rotor core is provided with a plurality of slots,
101. 102 The end plate,
103. A 111-tooth part of the tooth part,
104. The dividing part is used for dividing the object into a plurality of parts,
105. The groove part is provided with a groove part,
106. The main body part is provided with a plurality of grooves,
107. A thin-wall part is arranged on the inner side of the hollow cylinder,
11. The core body is divided into a plurality of sections,
112. The back of the core body.
Claims (9)
1. A rotating electrical machine, characterized by comprising:
A housing formed in a cylindrical shape;
an annular stator core which is fixed to an inner peripheral surface portion of the housing by shrink fitting or press fitting, and in which a plurality of electromagnetic steel plates are stacked in an axial direction; and
A metal end plate disposed at both axial ends of the stator core and having a plate thickness larger than that of the electromagnetic steel plate,
The end plate includes: a main body portion having a dividing portion extending in a radial direction at least at 1 in a circumferential direction; and a thin portion disposed in the dividing portion and coupled to the main body portion, the main body portion and the thin portion being coupled to each other to be integrally formed in a ring shape,
The stator core is constituted by a plurality of split cores split by radially extending split portions, or by integrally laminating the electromagnetic steel plates integrally formed in a ring shape.
2. The rotating electrical machine according to claim 1, wherein,
The stator core is composed of a plurality of split cores which are split by radially extending split parts,
The end plates are disposed at the two ends of the stator core such that the thin portions correspond to the divided portions of the stator core.
3. A rotary electric machine according to claim 2, wherein,
The split core includes: the back of the core body; and teeth extending radially inward from the core back,
The main body portion of the end plate includes: a core back corresponding to a shape of the core back of the split core; and a tooth portion corresponding to the shape of the tooth portion of the divided core,
The core back portion and the tooth portion in the main body portion of the end plate are disposed opposite to the core back portion and the tooth portion of the split core, respectively.
4. The rotating electrical machine according to claim 1, wherein,
The stator core is integrally formed in a ring shape, and includes: the back of the core body; and a plurality of teeth extending radially inward from the core back,
The end plate includes: a core back portion corresponding to a shape of a core back portion of the stator core; and a tooth portion corresponding to a shape of the tooth portion of the stator core,
The core back portion and the tooth portion in the main body portion of the end plate are disposed opposite to the core back portion and the tooth portion of the stator core, respectively.
5. The rotating electrical machine according to claim 1, wherein,
The main body of the end plate has only a core back portion having a shape corresponding to the core back portion of the stator core,
The main body portion of the end plate is configured to cover the core back portion of the stator core.
6. A rotary electric machine according to claim 2, wherein,
The main body of the end plate has only a core back portion having a shape corresponding to the core back portion of the stator core,
The main body portion of the end plate is configured to cover the core back portion of the stator core.
7. The rotating electrical machine according to any one of claim 1 to 6, wherein,
In the end plate, the main body portion and the thin wall portion are integrally formed of the same metal material.
8. The rotating electrical machine according to any one of claim 1 to 6, wherein,
The thin-walled portion of the end plate is constituted by a joining portion that joins the body portions to each other by welding in the divided portion of the end plate.
9. The rotating electrical machine according to any one of claim 1 to 6, wherein,
The thin-walled portion of the end plate is constituted by a joining portion that joins the body portions to each other by brazing in the divided portion of the end plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-202012 | 2019-11-07 | ||
| JP2019202012A JP6910413B2 (en) | 2019-11-07 | 2019-11-07 | Rotating machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112787430A CN112787430A (en) | 2021-05-11 |
| CN112787430B true CN112787430B (en) | 2024-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011155421.3A Active CN112787430B (en) | 2019-11-07 | 2020-10-26 | Rotary electric machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6910413B2 (en) |
| CN (1) | CN112787430B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005151648A (en) * | 2003-11-12 | 2005-06-09 | Daikin Ind Ltd | Motor and method of manufacturing motor, and driving unit, compressor, and mobile object |
| JP2014121195A (en) * | 2012-12-18 | 2014-06-30 | Mitsubishi Electric Corp | Armature and rotary electric machine equipped with the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5058097B2 (en) * | 2008-08-11 | 2012-10-24 | 株式会社東芝 | Rotating machine armature |
| JP2012125054A (en) * | 2010-12-08 | 2012-06-28 | Toyota Boshoku Corp | Rotary electric machine |
| US9438075B2 (en) * | 2011-02-03 | 2016-09-06 | Panasonic Intellectual Property Management Co., Ltd. | Motor stator and motor |
| US20190020228A1 (en) * | 2016-01-12 | 2019-01-17 | Mitsubishi Electric Corporation | Stator for rotary electric machine, rotary electric machine, and method for manufacturing stator for rotary electric machine |
| CN209562266U (en) * | 2019-01-23 | 2019-10-29 | 金华江科动力有限公司 | Motor rotor end plate |
-
2019
- 2019-11-07 JP JP2019202012A patent/JP6910413B2/en active Active
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2020
- 2020-10-26 CN CN202011155421.3A patent/CN112787430B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005151648A (en) * | 2003-11-12 | 2005-06-09 | Daikin Ind Ltd | Motor and method of manufacturing motor, and driving unit, compressor, and mobile object |
| JP2014121195A (en) * | 2012-12-18 | 2014-06-30 | Mitsubishi Electric Corp | Armature and rotary electric machine equipped with the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021078204A (en) | 2021-05-20 |
| CN112787430A (en) | 2021-05-11 |
| JP6910413B2 (en) | 2021-07-28 |
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