JP4627701B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine such as an electric motor or a generator, and more particularly, to a rotating electrical machine suitable for an electric power steering motor that requires excellent quietness and rotational characteristics.

  A general permanent magnet type small rotating electric machine includes a stator and a rotor, and a rotor arranged in the stator rotates. The stator core is generally formed by punching out a thin silicon steel plate or the like, and laminating it in the axial direction by welding or caulking. In the integrated stator core (integrated core), slot holes are provided in the circumferential direction of the inner peripheral portion of the cylindrical hole of the stator core, and the coil is formed from the slot opening portion of the core inner peripheral surface or the slot hole of the core laminated end surface. Or wrap the coil through the nozzle through the slot.

  On the other hand, as the structure of the stator core, for example, divided cores as described in Japanese Patent No. 3355700, Japanese Patent No. 3430521, Japanese Patent No. 2547131, and Japanese Patent Laid-Open No. 6-133501 are also known. It has been. In the split core, the stator core is divided into a plurality of pieces, wound in a concentrated manner on the teeth, and the core pieces are assembled after the winding to form the stator core. In this case, since the winding path can be secured, the alignment of the coils is improved, and a high coil space factor can be obtained.

  Regardless of the type of the integral core and the split core, these stator cores are housed in a case, and parts that support bearings are attached to both ends of the case to constitute a stator of a rotating electrical machine. Further, the case is provided with a flange for fixing the rotating electrical machine to other parts. Here, in order to give strength to the flange, the case material is often a metal such as iron or aluminum. Since the case and the stator core can be easily fixed without using other parts such as bolts, light press fitting and shrink fitting are widely used.

  The rotor is a combination of a metallic shaft and a rotor core obtained by punching and stacking steel plates such as SPCC, and magnets are attached to the surface of the rotor core or inserted into grooves in the core in the axial direction. Configure.

  The permanent magnet type rotating electrical machine having the above configuration is compact and highly efficient and does not discharge hazardous waste. Therefore, the permanent magnet type rotating electrical machine has been increasingly used in automobile equipment in place of a conventional engine-driven mechanism. The power steering device is also being replaced by an electric type using a motor from the conventional hydraulic drive, which improves the fuel efficiency by 3 to 5%.

Japanese Patent No. 3355700 Japanese Patent No. 3430521 Japanese Patent No. 2547131 JP-A-6-133501

  Here, the motor used for the electric power steering is required to have precision mechanical characteristics not found in the conventional motor in order to pursue safety and comfort. In particular, in order to obtain a safe and comfortable running feeling, a rotational characteristic with a very low loss torque is required. By having a rotation characteristic of extremely low loss torque, it is possible to turn the handle lightly when the motor is rotated without energization, and the handle can be turned back smoothly.

  In addition, since the motor used for the column type electric power steering is disposed near the passenger compartment, high quietness is required to provide a comfortable driving space for the driver.

  Furthermore, in order to obtain a safe and comfortable running feeling, a rotational characteristic with extremely low cogging torque is required. By having the rotation characteristics of extremely low cogging torque, the jerky feeling when the motor is rotated without energization is reduced, and the uncomfortable feeling when operating the steering wheel is eliminated.

  A first object of the present invention is to provide a rotating electrical machine capable of reducing loss torque.

  A second object of the present invention is to provide a rotating electrical machine with improved quietness.

  A third object of the present invention is to provide a rotating electrical machine with reduced cogging torque.

(1) In order to achieve the first object, the present invention provides a stator comprising a pipe-shaped case, a stator core, and a stator coil wound around a tooth portion of the stator core. The outer diameter of the stator is smaller than the inner diameter of the case, a holding material for holding the stator on the inner peripheral side of the case, brackets attached to both ends of the case, and inner portions of the stator while positioned in the circumferential side, e Bei a rotor which is rotatably supported by a bearing held by said bracket, said case has a protruding portion formed on the inner peripheral side thereof, the stator is And a recess formed in the outer peripheral portion of the stator core .
With this configuration, the loss torque can be reduced.

( 2 ) In the above (1), preferably, the holding material is resin, and the holding material is filled in a gap between an inner peripheral side of the case and an outer peripheral side of the stator. Is.

( 3 ) In the above (1), preferably, the holding material is a porous material, and the holding material is filled in a gap between an inner peripheral side of the case and an outer peripheral side of the stator. It is what.

( 4 ) In the above ( 3 ), preferably, the porous material is a resin containing hollow glass particles.

( 5 ) In the above (1), preferably, the stator core is composed of a plurality of divided cores divided in the circumferential direction, and the plurality of divided cores are inserted in the inner circumference of the annular member side by side in the circumferential direction. ing.

( 6 ) In order to achieve the second object, the present invention provides a stator comprising a pipe-shaped case, a stator core, and a stator coil wound around a tooth portion of the stator core. The outer diameter of the stator is smaller than the inner diameter of the case, the holding material for holding the stator 10 on the inner peripheral side of the case, brackets attached to both ends of the case, and the stator A rotor that is positioned on the inner peripheral side and rotatably supported by a bearing held by the bracket, the case has a convex portion formed on the inner peripheral side thereof, and the stator is The stator core has a recess formed in the outer peripheral portion thereof, and the holding material is a porous material.
With this configuration, silence can be improved.

( 7 ) In the above ( 6 ), preferably, the porous material is a resin containing hollow glass particles.

( 8 ) In order to achieve the third object, the present invention provides a stator comprising a pipe-shaped case, a stator core, and a stator coil wound around a tooth portion of the stator core. The outer diameter of the stator is smaller than the inner diameter of the case, the holding material for holding the stator 10 on the inner peripheral side of the case, brackets attached to both ends of the case, and the stator A rotor that is positioned on the inner peripheral side and rotatably supported by a bearing held by the bracket, the case has a convex portion formed on the inner peripheral side thereof, and the stator is The stator core has a concave portion formed on the outer peripheral portion thereof , and the stator core includes a plurality of divided cores divided in the circumferential direction, and the plurality of divided cores are arranged in the circumferential direction of the annular member. It is inserted in the inner circumference.
With this configuration, the cogging torque can be reduced.

( 9 ) In the above ( 8 ), preferably, the annular member is a resin molded product.

( 10 ) In the above ( 8 ), preferably, the annular member is a molded product of a magnetic body.

  According to the present invention, the loss torque of the rotating electrical machine can be reduced.

  Further, according to the present invention, the silence of the rotating electrical machine can be improved.

  Furthermore, according to the present invention, the cogging torque of the rotating electrical machine can be reduced.

Hereinafter, a configuration and a manufacturing method of a rotating electrical machine according to an embodiment of the present invention will be described with reference to FIGS.
Initially, the structure of the rotary electric machine by this embodiment is demonstrated using FIG.1 and FIG.2.
FIG. 1 is a cross-sectional view showing a configuration of a rotating electrical machine according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the configuration of the rotating electrical machine according to the embodiment of the present invention. FIG. 1 shows an AA cross section of FIG.

  As shown in FIG. 1, the rotating electrical machine mainly includes a stator 10 and a rotor 40. The stator 10 includes a stator core 12 and a stator coil 14. The stator core 12 is formed by, for example, integrally punching a thin silicon steel plate having a thickness of t0.35 mm or t0.5 mm and stacking the punched pieces. The stator core 12 includes an annular core back portion 12A, and a core teeth portion 12B that is integrally formed with the core back portion 12A and extends radially inward from the core back portion 12A. In this example, twelve core teeth portions 12B are arranged at equal intervals in the circumferential direction. The rectangular recess 12AX formed in the core back portion 12A is a caulking recess for stacking and fixing a plurality of thin plates.

  A thin plate-like insulating material (bobbin) 16 is attached to the outer peripheral side of each core tooth portion 12B. The insulating material 16 is made of plastic, for example. As the insulating material 16, an insulating paper or an insulating sheet can be used. A stator coil 14 is wound around the outer periphery of the insulating material 16 by concentrated winding via a core tooth portion 12B.

  The stator 10 is held by a holding member 30 on the inner peripheral side of the case 20. The case 20 is an annular metallic case. Here, the outer diameter of the stator 10 is smaller than the inner diameter of the case 20. Accordingly, a gap is formed between the inner peripheral side of the case 20 and the outer peripheral side of the stator 10, and the holding member 30 is disposed in the gap. The holding member 30 allows the stator 10 to be connected to the inner periphery of the case 20. Held on the side. The outer diameter of the stator 10 is, for example, about 2 mm smaller than the inner diameter of the case 20. Therefore, when the case 20 and the stator 10 are arranged concentrically, the gap between them is about 1 mm.

  On the inner peripheral side of the case 20, an arc-shaped convex portion 22 protruding in the inner diameter direction is formed. The convex portion 22 is formed to extend in the axial direction of the pipe-like case 20. The convex portion 22 is formed, for example, by extrusion from the outer peripheral side of the case 20. The height of the convex portion 22 (the height in the radial direction of the case 20) is, for example, 0.5 mm.

  On the other hand, on the outer peripheral side of the core back portion 12A of the stator core 12, a recess 12AZ that is recessed in the outer diameter direction is formed. The recess 12AZ is formed at the same time as the stator core is punched and formed. Since the stator core 12 is formed by laminating a plurality of thin plates, the recess 12AZ also extends in the axial direction of the stator 10. The depth of the recess 12AZ is, for example, 0.5 mm.

  When the stator 10 is concentrically disposed inside the case 20, the convex portion 22 of the case 20 and the concave portion 12AZ of the stator 10 are disposed so as to face each other. The convex portion 22 and the concave portion 12AZ are not necessarily opposed to each other.

  As the holding member 30, for example, a resin containing glass wool is used. As the resin material, for example, BMC resin (unsaturated polyester resin) is used. Further preferably, a BMC resin (unsaturated polyester resin) containing hollow glass particles is used as the resin material. The hollow glass particles are made of glass, have a diameter varying from 10 to 80 μm, for example, and are hollow members. The holding member 30 is filled by molding or the like with the stator 10 being concentrically arranged inside the case 20. By filling the holding member 30 in a state where the stator 10 is concentrically arranged inside the case 20, the stator 10 is integrally held inside the case 20.

  A hole 12AY is formed in the core back portion 12A of the stator core 12. The holes 12AY are also formed at the same time when the stator core 12 is stamped and formed. By aligning the positions of the holes 12AY and laminating a plurality of thin plates, the holes 12AY penetrate in the axial direction of the stator core 12. When the above-described holding member 30 is filled in the gap between the inside of the case 20 and the outside of the stator 10, the holding member 30 is also filled into the through hole 12AY.

  A rotor 40 is rotatably supported on the inner peripheral side of the stator 10 through a gap. The rotor 40 includes a rotor core 42, a shaft 44, a permanent magnet 46, and a case 48. For example, the rotor core 42 is formed by integrally punching thin silicon steel plates having a thickness of t0.35 mm or t0.5 mm, stacking the punched steel plates, and fixing them by caulking or the like. A metal shaft 44 is press-fitted and fixed to the inner periphery of the rotor core 42. A recess is provided on the outer periphery of the rotor core 42, and a plurality of permanent magnets 46 are attached to the recess with an adhesive or the like. The number of permanent magnets 46 is 10 in the illustrated example. The permanent magnets 46 are arranged at equal intervals in the circumferential direction of the surface of the rotor core 42. The polarities of adjacent permanent magnets 46 are opposite to each other in the circumferential direction. A metal cover 48 is disposed on the outer periphery of the permanent magnet 46. The cover 48 is press-fitted into the outer periphery of the rotor core 42 to which the permanent magnet 46 is attached.

  Next, as shown in FIG. 2, the front bracket 22 is fixed to one end portion of the case 20, and the rear bracket 24 is fixed to the other end portion. The front bracket 22 is screwed to the flange portion of the case 20. The rear bracket 24 is fixed by caulking a claw-shaped portion provided at the end of the case 20 to a protrusion provided on the outer periphery of the rear bracket 24. A shaft 26 of the rotor 40 is supported by a bearing 26F held by the front bracket 22 and a bearing 26R held by the rear bracket 24, and the rotor 40 can rotate through a gap on the inner peripheral side of the stator 10. It is supported by. In addition, about the rotor 40, only the outline is shown in figure. Further, only the upper half side of the stator 20 is shown in a cross-sectional view.

  A rotational speed sensor 50 for detecting the rotational speed of the rotor 40 is provided at the end of the rotor 40. For example, a resolver is used as the rotation speed sensor 50. A cover 52 is fixed to the rear bracket 24 with screws, and the rotational speed sensor 50 is waterproof and dustproof. The output of the rotation speed sensor 50 is taken out by the cable 54. The stator coil 14 of the stator 10 is energized from the outside via a cable 56.

  As shown in FIG. 2, the holding member 30 is formed in the holding member 30 </ b> A filled in the gap between the stator core 12 and the case 20 and the through hole 12 </ b> AY formed in the core back portion 12 </ b> A of the stator core 12. It consists of the filled holding member 30B and holding members 30C and 30D located on both end surfaces of the laminated core back portion 12A of the stator core 12. The holding members 30 </ b> A, 30 </ b> B, 30 </ b> C, and 30 </ b> D are integrated to prevent rotation between the stator core 12 and the holding member 30. Further, as described above, the convex portion 22 of the case 20 and the concave portion 12AZ of the stator 10 are arranged to face each other, and the holding member 30A is filled, so that the gap between the case 20 and the holding member 30 is The rotation is dried.

  When the torque of the rotating electrical machine is small, only the adhesive force of the resin that is the holding member 30 between the case 20 and the stator core 12 is provided without providing the convex portion 22 of the case 20 and the concave portion 12AZ of the stator 10. Thus, rotation of the case and the stator core may be prevented. Further, when the holding force of the case 20, the holding member 30, and the stator core 12 against the torque reaction force is insufficient, the holding member having a ring shape on the inner peripheral side of the end bracket 24 and the core laminated end portion on the end bracket side An uneven fitting portion may be formed in each of 30C, and a torque reaction force may be received here.

  As described above, in the present embodiment, the stator 10 is characterized in that it is held by the holding material 30 on the inner peripheral side of the case 20. Therefore, the outer periphery of the stator core 12 and the inner periphery of the case 20 are not in direct contact.

  Conventionally, the case is fixed to the outer periphery of the stator core by fixing the case to the outer periphery of the stator by shrink fitting or press-fitting the stator inside the case to fix the stator inside the case. It was stressed. In contrast, in the configuration of the present embodiment, the outer periphery of the stator core 12 is not subjected to compressive stress. When stress is applied to the electrical steel sheets constituting the stator core, the hysteresis characteristics deteriorate and the iron loss increases. On the other hand, in the structure of the present embodiment, the hysteresis characteristics of the stator core 12 are not deteriorated, and loss torque that is rotational torque at the time of non-energization can be reduced.

  Further, as in the conventional case, when shrink fitting or press fitting is performed, it is necessary to manage the tightening allowance between the case 20 and the stator core 12. For this purpose, it is necessary to improve the accuracy of the inner diameter of the case 20, and it is essential to cut the inner diameter of the case 20. However, in this embodiment, it is sufficient that the accuracy of the inner diameter of the case remains low, and the case 20 can be manufactured at low cost only by drawing.

  Further, the stator core 12 and the case 20 are not in direct contact, and the holding member 30 is interposed therebetween. As the holding member 30, for example, when a resin containing glass wool is used, the strength can be increased as compared with the case where a simple resin is used.

  Also, when BMC resin (unsaturated polyester resin) containing hollow glass particles is used as the resin material, the hollow glass particles work as a porous material, and due to their viscosity, sound caused by electromagnetic vibration of the stator core is generated. Can absorb sound. Therefore, the noise of the rotating electrical machine can be reduced as compared with the conventional case.

  In addition, when using resin as a holding member, it can replace with BMC resin and resin with high viscosity like rubber | gum can also be used. Further, as the holding member, a porous material can be used in place of the BMC resin containing hollow glass particles.

Next, the filling method of the holding member 30 in the rotating electrical machine according to the present embodiment will be described with reference to FIG.
FIG. 3 is a cross-sectional view for explaining a filling method of the holding member 30 in the rotating electrical machine according to the embodiment of the present invention. In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 indicate the same parts.

  The stator 10 and the case 20 are arranged concentrically inside the mold 60. The molding die 60 includes a bottom die 62, a side die 64, a center post 66, an upper die 68, and a lid die 69.

  The upper outer side wall surface 62A of the bottom mold 62 and the upper inner side wall surface 62B are formed concentrically. The side wall surface 66A on the outer periphery of the bottom of the center post 66 and the side wall surface 66B on the center outer periphery are formed concentrically. The center post 66 is held by the bottom die 62 so that the bottom outer peripheral surface 66A of the center post 66 is in contact with the side wall surface 62B inside the top of the bottom die 62. As a result, the upper outer side wall surface 62A of the bottom mold 62 and the central outer peripheral side wall surface 66B of the center post 66 are aligned coaxially.

  The inner peripheral surface of the case 20 is held in contact with the upper outer side wall surface 62 </ b> A of the bottom mold 62. Further, the inner peripheral surface of the stator 10 is held in contact with the side wall surface 66B of the center outer periphery of the center post 66. As a result, a substantially uniform gap (for example, 1 mm) is formed between the inner peripheral surface of the case 20 and the inner peripheral surface of the stator 10.

  Then, the upper mold 68 and the lid mold 69 are pressed from above the case 20 in the axial direction, and the resin is injected into the mold 60 from the resin injection portions 69A, 68A, 68B. Accordingly, the holding member 30 (30A, 30B, 30C, 30D) described with reference to FIG. 2 is formed, and the stator 10 is held by the holding material 30 on the inner peripheral side of the case 20.

  After integrating the stator 10 and the case 20 by injecting resin, the brackets 22 and 24 shown in FIG. 2 and the rotor 30 supported by the brackets 22 and 24 are attached, whereby a rotating electrical machine can be manufactured.

  As described above, according to the present embodiment, the loss torque can be reduced by using the holding member 30 as in the embodiment of FIGS. Moreover, noise can be reduced by using a porous material as the holding member.

Next, the configuration of a rotating electrical machine according to another embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a cross-sectional view showing a configuration of a rotating electrical machine according to another embodiment of the present invention. In addition, the shape of the longitudinal cross-section of the rotary electric machine by this embodiment becomes substantially the same as FIG. 2 except having added the annular member. 1 and 2 indicate the same parts.

  The stator core of the stator shown in FIGS. 1 and 2 uses an integral core, whereas in this embodiment, a split core is used as the stator core.

  The stator core 12 is formed in a ring shape by combining 12 T-shaped divided pieces 12C in the circumferential direction. The T-shaped divided piece 12C has a shape in which one tooth portion 12CA and a divided core back portion 12CB obtained by equally dividing the core back portion shown in FIG. 1 in the circumferential direction are integrated. The T-shaped divided pieces 12C are laminated after a thin steel plate is punched and formed.

  After the insulating material (bobbin) 16 is attached to the T-shaped divided piece 12C, the stator coil 14 is wound around the tooth portion 12CA. By dividing the core, the raceway surface of the nozzle that winds the coil can be secured, and the coil can be aligned and the winding can be performed with high density.

  Next, the plurality of wound T-shaped divided pieces 12C are arranged in the circumferential direction to form an annular shape, and an annular member 18 having an inner diameter roundness of several μm is inserted into the outer periphery thereof to temporarily fix the T-shaped core. The outer diameter of the stator core 12 and the inner diameter of the annular member 18 are set to have a dimensional relationship of movable fitting.

  When the annular member 18 is a molded product of a resin having a low shrinkage rate such as BMC resin, the inner diameter roundness can be maintained with high accuracy of several μm or less. Inner diameter and roundness can be ensured without using inner diameter cutting, and mass production can be performed at a low price. Further, if the magnetic powder is contained in the resin, the annular member 18 can be effectively used not only as a temporary fixing means for the split core 12 but also as a magnetic path, so that it is possible to reduce the size without reducing the magnetic performance of the rotating electrical machine. it can.

  The stator core 12 integrated with the annular member 18 is disposed inside the metallic case 20. Here, the outer diameter of the annular member 18 is smaller than the inner diameter of the case 20, and is about 2 mm in diameter, for example. Since the annular member 18 is integrated with the stator core 12 and becomes a part of the stator 10, the point is to make the outer diameter of the stator smaller than the inner diameter of the case 20. is there.

  As described with reference to FIG. 2, the gap between the annular member 18 and the case 20, the stacked end faces of the core back portion of the stator core 12, and the through holes in the core back of the stator core 12 30 is filled and integrated.

  The configuration of the rotor is the same as in FIG. Similarly to FIG. 2, the rotor is rotatably supported on the inner periphery of the stator 10 by a bearing held by a bracket.

  In the present embodiment, by using the holding member 30, the loss torque can be reduced as in the embodiment of FIGS. Moreover, noise can be reduced by using a porous material as the holding member.

Furthermore, since the outer periphery of the T-shaped split core is fixed by an annular member with high inner diameter accuracy, the inner core roundness of the stator core is dramatically improved. As a result, the cogging torque of the rotating electrical machine can be reduced. In conventional shrink fitting or light press fitting of the core to the case, the inner diameter roundness of the stator core is affected by the inner diameter shape of the case. To improve the inner diameter roundness, the inner diameter of the case must be processed with high accuracy. I had to be. Molding of the annular member is inexpensive and accurate, and the inner diameter of the case is not required.

It is a transverse cross section showing the composition of the rotation electrical machinery by one embodiment of the present invention. It is a longitudinal cross-sectional view which shows the structure of the rotary electric machine by one Embodiment of this invention. It is sectional drawing explaining the filling method of the holding member 30 in the rotary electric machine by one Embodiment of this invention. It is a cross-sectional view which shows the structure of the rotary electric machine by other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Stator 12 ... Stator core 14 ... Stator coil 12A ... Core back part 12AZ ... Recess 12AY ... Hole 12B ... Core teeth part 12C ... T-shaped division piece 12CA ... Teeth part 12CB ... Divided core back part 16 ... Insulation Material 18 ... annular member 20 ... case 22 ... convex 22 ... front bracket 24 ... rear brackets 26F, 26R ... bearing 30 ... holding material 40 ... rotor 42 ... rotor core 44 ... shaft 46 ... permanent magnet 48 ... case

Claims (10)

A pipe-shaped case,
A stator comprising a stator core and a stator coil wound around the teeth of the stator core;
The outer diameter of the stator is smaller than the inner diameter of the case, and a holding material for holding the stator on the inner peripheral side of the case;
Brackets attached to both ends of the case;
While positioned on the inner peripheral side of the stator, Bei example a rotor which is rotatably supported by a bearing held by the bracket,
The case has a convex portion formed on the inner peripheral side thereof,
The stator has a recess formed in an outer peripheral portion of the stator core . The rotating electrical machine according to claim 1, wherein
The holding material is a resin,
The rotating electric machine is characterized in that the holding material is filled in a gap between an inner peripheral side of the case and an outer peripheral side of the stator. The rotating electrical machine according to claim 1, wherein
The holding material is a porous material,
The rotating electric machine is characterized in that the holding material is filled in a gap between an inner peripheral side of the case and an outer peripheral side of the stator. In the rotating electrical machine according to claim 3,
The rotating electrical machine, wherein the porous material is a resin containing hollow glass particles. The rotating electrical machine according to claim 1, wherein
The stator core is composed of a plurality of divided cores divided in the circumferential direction,
A plurality of divided cores are arranged in the circumferential direction and inserted into the inner periphery of the annular member. A pipe-shaped case,
A stator comprising a stator core and a stator coil wound around the teeth of the stator core;
The outer diameter of the stator is smaller than the inner diameter of the case, and a holding material for holding the stator on the inner peripheral side of the case;
Brackets attached to both ends of the case;
A rotor located on the inner peripheral side of the stator and rotatably supported by a bearing held by the bracket;
The case has a convex portion formed on the inner peripheral side thereof,
The stator has a recess formed in the outer periphery of the stator core;
The rotating electric machine is characterized in that the holding material is a porous material. The rotating electrical machine according to claim 6 ,
The rotating electrical machine, wherein the porous material is a resin containing hollow glass particles. A pipe-shaped case,
A stator comprising a stator core and a stator coil wound around the teeth of the stator core;
The outer diameter of the stator is smaller than the inner diameter of the case, and a holding material for holding the stator on the inner peripheral side of the case;
Brackets attached to both ends of the case;
A rotor located on the inner peripheral side of the stator and rotatably supported by a bearing held by the bracket;
The case has a convex portion formed on the inner peripheral side thereof,
The stator has a recess formed in the outer periphery of the stator core;
The stator core is composed of a plurality of divided cores divided in the circumferential direction,
A plurality of divided cores are arranged in the circumferential direction and inserted into the inner periphery of the annular member. The rotating electrical machine according to claim 8 , wherein
The rotary electric machine is characterized in that the annular member is a resin molded product. The rotating electrical machine according to claim 8 , wherein
The rotary electric machine is characterized in that the annular member is a molded product of a magnetic material.

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