JP6910413B2 - Rotating machine - Google Patents

Description

The present application relates to a rotary electric machine.

A rotating electric machine having an armature coil on the stator and a field magnetic pole on the rotor is well known. When operating as an electric motor, this type of rotary electric machine rotates the rotor by generating a rotating magnetic field in the stator by the AC power supplied to the armature coil. The stator of a rotating electric machine includes a stator core in which a large number of slots for accommodating the coil conductor of the armature coil are formed. The stator core is formed by arranging a plurality of divided cores formed by laminating a plurality of thin plate-shaped electromagnetic steel plates punched into a predetermined shape in an annular shape, or a thin plate shape punched integrally in an annular shape in advance. It is constructed by laminating a plurality of electromagnetic steel sheets of.

The above-mentioned stator core is configured by integrally fixing a plurality of laminated electromagnetic steel sheets by means such as "pulling out" of crimping a die or an adhesive. The annular stator core thus formed is fixed to the housing by shrink fitting or press fitting into the inner peripheral surface portion of the stator housing. The rotor fixed to the shaft is inserted into the space provided in the stator core. The shaft is rotatably supported by a stator housing via bearings.

In recent years, there has been a demand for smaller and higher output rotary electric machines, but as a measure for higher output of rotary electric machines, further thinning of electrical steel sheets has been carried out. However, since the strength of the stator core decreases as the thickness of the electrical steel sheet decreases, when the stator core is fixed to the inner peripheral surface of the housing by shrink fitting or press fitting, the stator core is tightened by the housing. Due to the stress, the stress-concentrated portion of the stator core may be deformed due to buckling, or the electromagnetic steel sheet may be peeled off at the end in the stacking direction of the electrical steel sheet. Further, when a flange for fixing a rotary electric machine to a vehicle structure or the like is attached to a housing, a portion where compressive stress is partially concentrated is formed in the housing, and a stator core fixed to the inner peripheral surface of the housing is formed. It may be deformed.

In Patent Document 1, an annular restraining member for restricting axial deformation of the stator core is attached to both ends of the stator core in the axial direction, and the restraining member is shrink-fitted or press-fitted into the housing together with the stator core. A rotary electric machine is disclosed in which the tightening stress of the housing on the stator core is suppressed by fixing. Further, in Patent Document 2, the outer diameter dimension of the stator core is set to be equal to or less than the inner diameter dimension of the housing, and the stator core is sandwiched by the fixing member fixed to the housing. A rotary electric machine that suppresses deformation or strain is disclosed.

Japanese Unexamined Patent Publication No. 2012-143064 JP-A-2010-226932

According to the conventional rotary electric machine disclosed in Patent Document 1, deformation due to buckling of the stator core at the time of shrink fitting or press fitting of the stator core to the housing, or electromagnetic steel at the axial end of the stator core. It is said that peeling of the steel plate can be suppressed by restraint members provided at both ends of the stator core in the axial direction. However, in order to suppress the buckling of the stator core by the restraint member provided at the axial end of the stator core, the outer peripheral surface portion of the restraint member and the outer peripheral surface portion of the stator core are formed on the inner circumference of the housing. It must be in contact with the face portion, and the outer diameter of the stator core and the outer diameter of the restraining member must match.

Since the electromagnetic steel sheet constituting the stator core is formed to have a small plate thickness, it is possible to process it with relatively high accuracy. However, since the restraining member has a plate thickness larger than the plate thickness of the electromagnetic steel sheet, It is difficult to perform high-precision machining on the restraint member as is performed on electrical steel sheets. Therefore, in the conventional rotary electric machine disclosed in Patent Document 1, it is difficult to match the outer diameter dimension of the restraining member with the outer diameter dimension of the stator core, and the stator core is deformed due to buckling or the electromagnetic steel plate is peeled off. Could be difficult to control. Further, in order to improve the processing accuracy of the restraint member, the manufacturing cost increases and the cost becomes high.

Further, when the stator core is composed of a plurality of divided cores, the heights of the electromagnetic steel sheets in the stacking direction vary among the plurality of divided cores, so the plurality of divided cores are aligned in the circumferential direction. When the annular stator core is configured, the axial length may vary at different positions in the circumferential direction of the annular stator core. Therefore, when a restraint member integrally formed in an annular shape is fixed to the axial end of the stator core composed of a plurality of divided cores, a gap is generated between the restraint member and the stator core, and the stator core is formed. It may be difficult to suppress deformation due to buckling or peeling of the electromagnetic steel sheet.

Further, in the conventional rotary electric machines disclosed in Patent Document 1 and Patent Document 2, when the roundness of the stator core is low, or when the stator core is formed in an annular shape by a plurality of split cores, the shaft is as described above. If there is a variation in the length in the direction, there may be a place where the stator core does not contact the restraining member or the fixing member, and it may be difficult to suppress the deformation of the stator core at the time of shrink fitting or press fitting. rice field.

The present application discloses a technique for solving the above-mentioned problems, in which the stator core of a rotary electric machine is deformed and laminated due to buckling of the stator core that occurs when the stator core is shrink-fitted or press-fitted into a housing. It is an object of the present invention to provide a rotary electric machine capable of suppressing peeling of an electromagnetic steel sheet.

The rotary electric machine disclosed in the present application is
With a tubular housing
An annular stator core, which is fixed to the inner peripheral surface of the housing by shrink fitting or press fitting, and in which a plurality of electrical steel sheets are laminated in the axial direction.
Metal end plates arranged at both ends of the stator core in the axial direction and having a plate thickness larger than the plate thickness of the electromagnetic steel plate, and
With
The end plate has a main body portion provided with a dividing portion extending in the radial direction at at least one position in the circumferential direction, and a thin-walled portion arranged in the divided portion and coupled to the main body portion. The thin-walled portions are connected to each other and integrally formed in an annular shape .
It is characterized by that.

According to the rotary electric machine according to the present application, it is possible to suppress deformation and peeling of laminated electromagnetic steel sheets due to buckling of the stator core, which occurs when the stator core is shrink-fitted or press-fitted into the inner peripheral surface of the housing. A rotary electric machine can be obtained.

It is a perspective view which shows the structure of the rotary electric machine according to Embodiment 1. FIG. It is sectional drawing which shows the structure of the rotary electric machine according to Embodiment 1. FIG. It is a top view which shows the end plate of the rotary electric machine according to Embodiment 1. FIG. FIG. 5 is a top view showing a state in which the stator core and the end plate are fixed to the housing in the rotary electric machine according to the first embodiment. It is a top view which shows the stator core of the rotary electric machine according to Embodiment 2. FIG. It is a top view which shows another example of the stator core of the rotary electric machine according to Embodiment 2. FIG. It is a top view which shows the end plate of the rotary electric machine according to Embodiment 2. It is a top view which shows the stator core of the rotary electric machine according to Embodiment 3. FIG. It is a top view which shows the end plate of the rotary electric machine according to Embodiment 3. FIG. It is a top view which shows the stator core and the end plate of the rotary electric machine according to Embodiment 4. FIG.

Embodiment 1.
FIG. 1 is a perspective view showing the configuration of the rotary electric machine according to the first embodiment, and FIG. 2 is a cross-sectional view showing the configuration of the rotary electric machine according to the first embodiment. The stator core of the rotary electric machine according to the first embodiment is configured by arranging a plurality of divided cores in an annular shape. In FIGS. 1 and 2, the 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 an annular shape, a tubular housing 4, and a stator as an armature coil mounted on the stator core 7. It has a coil 8 and a pair of brackets (not shown).

In the split core 11, an electromagnetic steel sheet having a thickness of about 0.2 [mm] to 0.5 [mm] is punched into a predetermined shape by press working, and a plurality of punched magnetic steel sheets are laminated. Then, a laminated block is formed, and a plurality of laminated electromagnetic steel sheets are integrally fixed and configured by means such as "punching" or an adhesive for crimping the laminated block with a mold. The number of divided cores constituting the stator core 7 is not limited to 48.

The stator core 7 formed by arranging a plurality of divided cores in an annular shape is formed on 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 abuts on the inner peripheral surface portion of the housing 4. It is inserted and fixed. An annular metal end plates 101 and 102, which will be described later, are arranged at both ends of the stator core 7 in the axial direction, respectively. The end plates 101 and 102 are inserted and fixed together with the stator core 7 into the inner peripheral surface portion of the housing 4 by shrink fitting or press fitting.

The coil conductor constituting the stator coil 8 has a rectangular or circular cross section. This coil conductor is inserted into a slot 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 and 62 fixed to the shaft 5. The rotor 3 includes a rotor core 9 fixed to the shaft 5 by press fitting or the like. The rotor core 9 is formed by laminating electromagnetic steel sheets formed in a thin plate shape, and includes a plurality of permanent magnets (not shown) housed inside holes penetrating in the laminating direction of the electromagnetic steel sheets. The plurality of permanent magnets are arranged at equal pitches in the circumferential direction of the rotor core 9, and each constitutes a field magnetic pole. The rotor core 9 of the rotor 3 is arranged in the inner space portion of the stator core 7, and its outer peripheral surface portion faces the inner peripheral surface portion of the stator core 7 via a gap.

In the rotary electric machine 1 configured as described above, for example, when a three-phase AC power is supplied to the stator coil 8, a rotating magnetic field is generated in the stator 2, and the field magnetic flux provided in the rotor 3 is generated. The rotor 3 rotates due to the interaction between the generated magnetic flux and the rotating magnetic field.

Next, the above-mentioned end plates 101 and 102 will be described. FIG. 3 is a top view showing the end plate of the rotary electric machine according to the first embodiment, and FIG. 4 is a top view showing a state in which the stator core and the end plate are fixed to the housing in the rotary electric machine according to the first embodiment. Is. In FIGS. 3 and 4, the end plates 101 and 102 are fixed to both ends of the stator core 7 in the axial direction, that is, both ends in the stacking direction of the electromagnetic steel sheets by welding or an adhesive.

The end plates 101 and 102 include a main body portion 106 divided into 48 pieces in the circumferential direction by 48 divided parts 104 extending in the radial direction, and 48 thin-walled parts 107 arranged in each of the divided parts 104. It has. The planar shape of the main body 106 has the same shape as the planar shape of the split core 11, but the width of the teeth portion 103 in the circumferential direction is the teeth portion of the split core 11 in the stator core 7 (not shown). It is formed smaller than the width in the circumferential direction of. The main body 106 of the end plates 101 and 102 has a plate thickness larger than the plate thickness of the electromagnetic steel plate constituting the stator core 7.

The thin portion 107 of the end plates 101 and 102 has a plate thickness smaller than that of the main body 106 and extends in the radial direction of the end plates 101 and 102 from the outer peripheral surface of the end plates 101 and 102 to the bottom of the slot 105. ing. The main body portion 106 and the thin-walled portion 107 are integrally formed of, for example, the same metal material, and are connected to each other.

The main body portion 106 and the thin-walled portion 107 are individually divided and formed, and the divided main body portion 106 and the thin-walled portion 107 are alternately arranged in an annular shape to form an annular end plate as a whole. 101 and 102 may be formed. In this case, the divided main body portion 106 and the thin-walled portion 107 are connected to each other by welding or brazing at one location in the radial direction of the end plates 101 and 102, for example, and the end plate 101 as a whole is annular. , 102. In this way, if the main body portion 106 and the thin-walled portion 107 are connected to each other to form the annular end plates 101 and 102, the main body portion 106 and the thin-walled portion 107 are made of the same material. Compared to the case where the material is integrally formed in a ring shape, the material yield is improved and the material cost can be reduced.

In the end plates 101 and 102, each main body portion 106 is arranged corresponding to each divided core 11 of the stator core 7, and the divided portion 104 and the thin-walled portion 107 correspond to the divided portion of the stator core 7. Be placed.

The outer dimension of the stator core 7 is larger than the inner diameter of the tubular housing 4, and the tightening allowance of, for example, about 0.1 [mm] to 0.4 [mm] is the stator core. It is given to 7. The annular stator core 7 is inserted into the inner peripheral surface portion of the housing 4 by a method such as shrink fitting or press fitting, and is fixed to the housing 4. At this time, due to the press-fitting stress generated by giving the above-mentioned tightening allowance to the stator core 7, a radial tightening stress is applied to the stator core 7, and at the same time, the split cores 11 are arranged in an annular shape. Therefore, the reaction force in the circumferential direction is received at the portion where the adjacent split cores 11 come into contact with each other.

When the stator core 7 is inserted into the inner peripheral surface of the housing 4 by shrink fitting or press fitting, if the adhesive strength between the laminates of the electromagnetic steel sheets constituting the stator core 7 or the caulking strength is not sufficient, the electromagnetic steel sheet The smaller the plate thickness, the lower the rigidity of the split core 11 formed as a laminated body of electrical steel sheets, so that the stator core 7 is more likely to buckle due to the reaction force in the circumferential direction. Therefore, it is not preferable from the viewpoint of the rigidity of the split core 11 to further reduce the thickness of the electrical steel sheet in order to improve the performance of the rotary electric machine.

Therefore, in order to suppress deformation due to buckling of the stator core 7 or peeling of the laminated electromagnetic steel sheets, both ends of the stator core 7 in the stacking direction, that is, both ends of the stator core 7 in the axial direction. The above-mentioned annular end plates 101 and 102 are fixed to the portion. In order to suppress the buckling of the stator core 7, it is necessary that the outer peripheral surfaces of the end plates 101 and 102 are in contact with the inner peripheral surface of the housing 4. Therefore, conventionally, it has been necessary that the outer diameter dimension of the stator core 7 and the outer diameter dimension of the end plates 101 and 102 match. However, while the electromagnetic steel sheet has a small plate thickness and can be processed with high precision, the end plates 101 and 102 have a plate thickness larger than the plate thickness of the electromagnetic steel plate, so that they are outside the end plates 101 and 102. In order to match the diameter dimension with the outer diameter dimension of the stator core 7, it was necessary to process the end plates 101 and 102 with high accuracy in order to make up for the difference in processing accuracy caused by the difference in plate thickness. ..

Further, the height of the electromagnetic steel sheets in the split core 11 in the stacking direction varies among the individual split cores 11, and therefore, the axial length of the annular stator core 7 is the circumference of the stator core 7. There is variability between positions in different directions. Therefore, a single end plate 101, 102 integrally formed with respect to the stator core 7 formed by arranging a plurality of divided cores 11 in an annular shape is fixed to both ends of the stator core 7 in the axial direction. In this case, since the end plates 101 and 102 cannot absorb the variation in height in the stacking direction between the plurality of divided cores 11, a gap is generated between the stator core 7 and the end plates 101 and 102. There is a possibility that the effect of suppressing the buckling of the stator core 7 by the end plates 101 and 102 cannot be obtained.

According to the rotary electric machine according to the first embodiment of the present application, the end plates 101 and 102 are provided in the main body portion 106 divided by the dividing portion 104 extending in the radial direction and the divided portion 104, and are connected to the main body portion 106. Since the main body portion 106 is configured to have a plate thickness larger than the plate thickness of the electromagnetic steel plate, the stator core 7 and the end plates 101 and 102 are processed based on the difference in plate thickness. Even if there is a difference between the outer diameter of the stator core and the outer diameter of the end plates 101 and 102 due to the difference in accuracy, the thin portion 107 bends to absorb the difference in the outer diameter. Can be done.

As a result, similarly to the stator core 7, the outer peripheral surface portions of the end plates 101 and 102 can be brought into contact with the inner peripheral surface portion of the housing 4 and fixed by shrink fitting or press fitting. Therefore, it is not necessary to process the end plates 101 and 102 with high accuracy, and the processing cost can be reduced. Further, by arranging the thin-walled portions 107 of the end plates 101 and 102 at the locations corresponding to the divided portions of the stator core 7, the thin-walled portions 107 bend the variation in height in the stacking direction of the respective divided cores 11. Since it can be absorbed by this, the end plates 101 and 102 can be reliably brought into contact with both end faces of the stator core 7 in the axial direction and fixed, and buckling of the stator core 7 can be suppressed. It will be possible.

Embodiment 2.
5 is a top view showing the stator core of the rotary electric machine according to the second embodiment, FIG. 6 is a top view showing another example of the stator core of the rotary electric machine according to the second embodiment, and FIG. 7 is a top view showing the embodiment. It is a top view which shows the end plate of the rotary electric machine according to the 2nd form. The stator core 7 of the rotary electric machine according to the second embodiment shown in FIG. 5 is configured by arranging 24 split cores 11 in an annular shape. Each split core 11 includes two teeth portions 111. The end plates 101 and 102 shown in FIG. 7 are fixed to both ends in the axial direction of the stator core 7 shown in FIG. 5, that is, both ends in the stacking direction of the electromagnetic steel sheets.

As shown in FIG. 7, the end plates 101 and 102 include 24 main body portions 106 divided by 24 divided portions 104 and 24 thin-walled portions 107 arranged in each divided portion 104. There is. The planar shape of the main body 106 is similar to the planar shape of the split core 11, but the width of the teeth portion 103 in the circumferential direction is the circumferential width of the teeth portion 111 of the split core 11 in the stator core 7. It is formed smaller than the width. The main body 106 of the end plates 101 and 102 has a plate thickness larger than the plate thickness of the electromagnetic steel plate constituting the stator core 7.

The thin portion 107 of the end plates 101 and 102 extends in the radial direction of the end plates 101 and 102 from the outer peripheral surface portion of the end plates 101 and 102 to the bottom of the slot portion 105. The main body portion 106 and the thin-walled portion 107 are integrally formed of, for example, the same metal material, and are connected to each other.

The main body portion 106 and the thin-walled portion 107 are individually divided and formed, and the divided main body portion 106 and the thin-walled portion 107 are alternately arranged in an annular shape to form an annular end plate as a whole. 101 and 102 may be formed. In this case, the divided main body portion 106 and the thin-walled portion 107 are connected to each other by welding or brazing at one location in the radial direction of the end plates 101 and 102, for example, and the end plate 101 as a whole is annular. , 102. In this way, if the main body portion 106 and the thin-walled portion 107 are connected to each other to form the annular end plates 101 and 102, the main body portion 106 and the thin-walled portion 107 are made of the same material. Compared to the case where the material is integrally formed in a ring shape, the material yield is improved and the material cost can be reduced.

In the end plates 101 and 102, each main body portion 106 is arranged corresponding to each divided core 11 of the stator core 7, and the divided portion 104 and the thin-walled portion 107 correspond to the divided portion of the stator core 7. Be placed. The end plates 101 and 102 are fixed to both ends of the stator core 7 in the axial direction by welding or an adhesive.

The stator core of the rotary electric machine according to the second embodiment shown in FIG. 6 is configured by arranging four divided cores 11 in an annular shape. Each split core 11 includes twelve teeth portions 111. End plates (not shown) are fixed to both ends of the stator core 7 shown in FIG. 6 in the axial direction, that is, both ends of the electromagnetic steel sheets in the stacking direction. The end plate in this case includes four main body portions having the same shape as the split core 11 shown in FIG. 6, four split portions, and four thin-walled portions arranged in the split portions. The main body includes 12 teeth parts. Other configurations of the end plate and arrangement of the stator core 7 at both ends in the axial direction are the same as in the case of the end plates 101 and 102 shown in FIG. 7 above.

According to the rotary electric machine according to the second embodiment, the thin portion 107 of the end plates 101 and 102 is fixed by arranging the thin portion 107 of the stator core 7 at a position corresponding to the divided portion of the stator core 7 as in the case of the first embodiment. It is possible to absorb the difference in processing accuracy based on the difference in plate thickness between the child core 7 and the end plates 101 and 102, and high-precision processing is not required to match the outer diameter dimensions of the end plates 101 and 102 and the stator core 7. Therefore, it is possible to reduce the processing cost. Further, since the variation in height of the divided cores 11 in the stacking direction can be absorbed by the thin portion 107 of the end plates 101 and 102, the end plates 101 and 102 can be securely fixed to the stator core 7. This makes it possible to suppress buckling of the stator core 7. The number of divisions of the division core and the number of divisions of the end plate are not limited to those described above.

Embodiment 3.
FIG. 8 is a top view showing the stator core of the rotary electric machine according to the third embodiment, and FIG. 9 is a top view showing the end plate of the rotary electric machine according to the third embodiment. As shown in FIG. 8, the stator core 7 of the rotary electric machine according to the third embodiment is formed by laminating electromagnetic steel sheets integrally formed in an annular shape, and has a plurality of teeth portions 111 on the inner peripheral portion. There is. The end plates 101 and 102 shown in FIG. 9 are fixed to both ends of the integrally configured stator core 7 in the axial direction.

As shown in FIG. 9, the end plates 101 and 102 are provided with a divided portion 104 at one position in the circumferential direction of the main body portion 106 formed in an annular shape, and the thin-walled portion 107 is arranged in the divided portion 104. The circumferential width of the teeth portion 103 of the main body portion 106 of the end plates 101 and 102 is formed to be smaller than the circumferential width of the teeth portion 111 of the stator core 7. The main body 106 of the end plates 101 and 102 has a plate thickness larger than the plate thickness of the electromagnetic steel plate constituting the stator core 7.

The thin portion 107 of the end plates 101 and 102 extends in the radial direction of the end plates 101 and 102 from the outer peripheral surface portion of the end plates 101 and 102 to the bottom of the slot portion 105. The main body portion 106 and the thin-walled portion 107 are integrally formed of, for example, the same metal material, and are connected to each other.

The main body portion 106 and the thin-walled portion 107 may be individually divided and configured. In this case, the divided main body portion 106 and the thin-walled portion 107 are connected to each other by welding or brazing, for example, at one position in the radial direction of the end plates 101 and 102. In this way, if the main body portion 106 and the thin-walled portion 107 are configured separately, the material yield is improved as compared with the case where the main body portion 106 and the thin-walled portion 107 are integrally formed of the same material in an annular shape. , Has the effect of reducing material costs.

Even if the stator core 7 is integrally configured, if the thickness of the magnetic steel sheets to be laminated is small, the rigidity of the stator core 7 is weak, and when it is fixed to the housing 4 by shrink fitting or press fitting, There is a possibility that the electromagnetic steel sheet may be deformed due to the press-fitting stress, or the electrical steel sheet may be turned over at the end face portion of the stator core 7 in the stacking direction. According to the configuration of the rotary electric machine according to the third embodiment, since the end plates 101 and 102 are provided with one thin-walled portion 107 as described above, the thickness of the main body portion 106 of the end plates 101 and 102 is fixed. The variation in outer diameter dimension due to the difference in processing accuracy between the two based on the difference from the thickness of the electromagnetic steel sheet constituting the core steel 7 is absorbed by the shrinkage of the thin portion 107 during shrink fitting to the housing 4 or press fitting. NS.

Therefore, the outer peripheral surface portions of the end plates 101 and 102 as well as the outer peripheral surface portion of the stator core 7 come into contact with the inner peripheral surface portion of the housing 4, and the electromagnetic steel sheet is deformed due to press-fitting stress, or the end face portion of the stator core 7 in the stacking direction. Turning over of electrical steel sheets is prevented.

In the rotary electric machine according to the third embodiment, since the stator core 7 is integrally formed, the height in the stacking direction does not vary at different positions in the circumferential direction of the stator core 7. Therefore, the position of the thin portion 107 on the end plates 101 and 102 may be any position with respect to the stator core 7.

The end plates 101 and 102 shown in FIG. 9 show a case where one divided portion 104 and one thin-walled portion are provided, but two or more divided portions 104 and two or more thin-walled portions 107 are provided. May be provided.

Embodiment 4.
FIG. 10 is a top view showing the stator core and end plate of the rotary electric machine according to the fourth embodiment. In FIG. 10, the stator core 7 is configured by arranging 48 divided cores 11 in an annular shape as in the case of the first embodiment, and each of the divided cores 11 has a core back portion 112 and a teeth portion. It is equipped with 111. The end plates 101 and 102 fixed to both ends of the stator core 7 in the axial direction have 48 main body portions 106, 48 divided portions 104, and 48 thin-walled portions arranged in these divided portions 104. It is provided with a unit 107. The main body 106 of the end plates 101 and 102 does not have a teeth portion corresponding to the teeth portion 111 of the split core 11, but has a shape corresponding only to the core back portion 112 of the split core 11.

The main body 106 of the end plates 101 and 102 has a plate thickness larger than the plate thickness of the electromagnetic steel plate constituting the stator core 7. The thin portion 107 of the end plates 101 and 102 extends in the radial direction of the end plates 101 and 102 from the outer peripheral surface portion to the inner peripheral surface portion of the end plates 101 and 102. The main body portion 106 and the thin-walled portion 107 are integrally formed of, for example, the same metal material, and are connected to each other.

The main body portion 106 and the thin-walled portion 107 may be individually divided and configured. In this case, the divided main body portion 106 and the thin-walled portion 107 are connected to each other by welding or brazing, for example, at one position in the radial direction of the end plates 101 and 102. In this way, if the main body portion 106 and the thin-walled portion 107 are configured separately, the material yield is improved as compared with the case where the main body portion 106 and the thin-walled portion 107 are integrally formed of the same material in an annular shape. , Has the effect of reducing material costs.

As shown in FIG. 10, the end plates 101 and 102 configured as described above are arranged so as to cover the core back portion 112 in the split core 11 of the stator core 7 and are fixed to the stator core 7. .. The divided portion 104 and the thin-walled portion 107 of the end plates 101 and 102 are arranged at positions corresponding to the divided portions of the stator core 7. The teeth portion 111 of the split core 11 in the stator core 7 is exposed without being covered by the end plates 101 and 102.

According to the rotary electric machine according to the fourth embodiment, since the end plates 101 and 102 are provided with the thin-walled portion 107 as in the rotary electric machine according to each of the above-described embodiments, the plate of the main body portion 106 of the end plates 101 and 102 is provided. The variation in the outer diameter dimension due to the difference in processing accuracy between the thickness and the thickness of the electromagnetic steel sheet constituting the stator core 7 causes the thin portion 107 to bend during shrink fitting to the housing 4 or press fitting. Is absorbed by.

Therefore, the outer peripheral surface portions of the end plates 101 and 102 as well as the outer peripheral surface portion of the stator core 7 come into contact with the inner peripheral surface portion of the housing 4, and the electromagnetic steel sheet is deformed due to press-fitting stress, or the end face portion of the stator core 7 in the stacking direction. It is possible to prevent the electromagnetic steel sheet from being turned over.

Further, according to the rotary electric machine according to the fourth embodiment, since the end plates 101 and 102 are configured to cover only the core back portion of the electromagnetic steel plate of the stator core 7, the weight of the end plates 101 and 102 is reduced. Further, since the shapes of the end plates 101 and 102 can be made into a simple annular shape, the processing cost can be reduced. Further, since the end plates 101 and 102 have a shape corresponding only to the core back portion which is far from the rotor and the change in magnetic flux density is small, the iron made of the end plates 101 and 102 having a larger plate thickness than the electromagnetic steel plate. The increase in loss can be suppressed.

The conventional rotary electric machine disclosed in Patent Document 2 has a structure in which stress is not generated in the fixed iron core at the time of shrink fitting or press fitting of the fixed iron core into the housing, but the fixed iron core is fixed to the housing only by being sandwiched by the fixing member. The position of the stator core may fluctuate in the housing, which may lead to an increase in noise or vibration of the rotating electric machine. However, in the rotating electric machine according to the present application, the stator core is the inner circumference of the housing together with the end plate. Since it is fixed to the surface by shrink fitting or press fitting, the position of the stator core does not change in the housing, and noise or vibration of the rotating electric machine can be prevented.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations. Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed in the present application. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 rotor machine, 2 stator, 3 rotor, 4 housing, 5 shaft, 61, 62 bearing, 7 stator core, 8 stator coil, 9 rotor core, 101, 102 end plate, 103, 111 teeth part, 104 split part, 105 slot part, 106 main body part, 107 thin wall part, 11 split core, 112 core back part

Claims (8)

With a tubular housing
An annular stator core, which is fixed to the inner peripheral surface of the housing by shrink fitting or press fitting, and in which a plurality of electrical steel sheets are laminated in the axial direction,
Metal end plates arranged at both ends of the stator core in the axial direction and having a plate thickness larger than the plate thickness of the electromagnetic steel plate, and
With
The end plate has a main body portion provided with a dividing portion extending in the radial direction at at least one position in the circumferential direction, and a thin-walled portion arranged in the divided portion and coupled to the main body portion. The thin-walled portions are connected to each other and integrally formed in an annular shape .
A rotating electric machine characterized by that. The stator iron core, Luca is composed of a plurality of split cores that are divided by a dividing portion extending radially, or formed integrally by laminating the electromagnetic steel sheet which is integrally formed with the annular,
The rotary electric machine according to claim 1. The stator core is composed of a plurality of divided cores divided by a dividing portion extending in the radial direction.
The end plates are arranged at both ends of the stator core so that the thin-walled portions correspond to the divided portions of the stator core.
The rotary electric machine according to claim 1. The divided core includes a core back portion and a teeth portion extending inward in the radial direction from the core back portion.
The main body portion of the end plate includes a core back portion having a shape corresponding to the core back portion of the split core and a teeth portion having a shape corresponding to the teeth portion of the split core .
The core back portion and the teeth portion in the main body portion of the end plate are arranged so as to face the core back portion and the teeth portion of the divided core, respectively.
The rotary electric machine according to claim 3. The stator core is integrally formed in an annular shape, and includes a core back portion and a plurality of teeth portions extending inward in the radial direction from the core back portion .
The end plate includes a core back portion having a shape corresponding to the core back portion of the stator core and a teeth portion having a shape corresponding to the teeth portion of the stator core.
The core back portion and the teeth portion in the main body portion of the end plate are arranged so as to face the core back portion and the teeth portion of the stator core, respectively.
The rotary electric machine according to claim 1. The main body of the end plate includes 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 arranged so as to cover the core back portion of the stator core .
The rotary electric machine according to claim 1 or 3 , wherein the rotary electric machine is characterized in that. In the end plate, the main body portion and the thin-walled portion are integrally formed of the same metal material .
The rotary electric machine according to any one of claims 1 to 6 , wherein the rotary electric machine is characterized in that. The thin-walled portion of the end plate is composed of a joint portion that joins the adjacent main body portions by welding or brazing in the divided portion of the end plate.
The rotary electric machine according to any one of claims 1 to 6, wherein the rotary electric machine is characterized in that.

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