JP2017169265A - Stator core fixing structure and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator core fixing structure capable of suitably solving problems associated with press-fitting of the stator core to a stator holder, and a method of manufacturing the same.SOLUTION: A stator core fixing structure 16 includes: a stator core 30; and a stator holder 36 that holds the stator core 30 in a pressed state on the outer periphery of the stator core 30. Further, the stator core fixing structure 16 includes a guide member 38 that extends in the axial direction of a rotary electrical machine 10 between an outer peripheral surface 58 of the stator core 30 and an inner peripheral surface 70 of the stator holder 36 and keeps the stator core 30 and the stator holder 36 in a non-contact state.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a stator core fixing structure including a stator core and a stator holder that holds the stator core, and a manufacturing method thereof.

  In Patent Document 1, the generation of burrs when the outer peripheral surface of the stator core is press-fitted into the inner peripheral surface of the shell is pointed out as a problem ([0005]). Therefore, in Patent Document 1, when the laminated core is fixed by being press-fitted into another member, the pressure applied to the laminated core is fixed to the minimum while preventing the deterioration of the magnetic properties, and plastic. An object of the present invention is to provide a press-fit fixing structure that can prevent a part of another deformed member from breaking and falling outside ([0006], summary).

  In order to achieve the said objective, in patent document 1 (abstract), the outer peripheral surface 12a of the stator core 12 has the several core convex part 25 formed intermittently in the circumferential direction. The inner peripheral surface 13 a of the stator holder 13 has a plurality of holder convex portions 27 that are formed intermittently in the stacking direction (axial direction) of the plurality of steel plates 18. When the outer peripheral surface 12 a of the stator core 12 is press-fitted into the inner peripheral surface 13 a of the stator holder 13, the core convex portion 25 is plastically deformed by the holder convex portion 27, and is inside the surface of the inner peripheral surface 13 a of the stator holder 13. Get in. An adhesive is impregnated between the outer peripheral surface 12 a of the stator core 12 and the press-fitting surface of the stator holder 13. An attempt is made to suppress the adverse effects of burrs by using this adhesive ([0011]).

  Patent Document 2 aims to provide a motor having a split stator and capable of reducing the machining cost and the assembling cost from the conventional one while maintaining the rigidity of the motor ([0007], summary). In order to achieve the object, in Patent Document 2 (Abstract), a plurality of divided stators 4a are press-fitted into an inner peripheral surface of a cylindrical stator holder 8a, and the stator 2 is arranged annularly along the circumferential direction. And the motor 1 comprised from the rotor 3 arrange | positioned at the internal peripheral surface of the stator 2 is disclosed. The end 13a of the stator holder 8a includes a bent portion 14 having an R-shaped cross section that is bent in the inner circumferential direction.

JP 2014-096971 A JP 2008-193806 A

  As described above, Patent Document 1 proposes a solution to the problem of burrs that occur when the outer peripheral surface of the stator core (stator core) is press-fitted into the inner peripheral surface of the shell (stator holder). There is room for improvement. For example, in Patent Document 1, the movement of burrs is regulated by using an adhesive, but it is preferable to suppress the occurrence of burrs in the first place. In addition, when the stator core is press-fitted into the stator holder, other problems (for example, lifting of the stator core described later with reference to FIGS. 7A to 9C) may also occur. Patent Document 2 does not disclose these points. These problems are not limited to the case where the stator core is press-fitted into the stator holder.

  The present invention has been made in consideration of the above-described problems, and provides a stator core fixing structure and a method for manufacturing the same that can suitably solve problems associated with press-fitting of the stator core into the stator holder. Objective.

Stator core fixing structure according to the present invention,
A stator core;
A stator holder for holding the stator core in a pressed state on the outer periphery of the stator core,
A guide member extending in the axial direction of the rotating electrical machine between the outer peripheral surface of the stator core and the inner peripheral surface of the stator holder, and maintaining a non-contact state between the stator core and the stator holder; To do.

  According to the present invention, the stator core and the stator holder are kept in a non-contact state by the guide member. Accordingly, when the stator core is inserted into the stator holder, the contact between the outer peripheral surface of the stator core and the inner peripheral surface of the stator holder is suppressed, so that the stator core Occurrence of burrs or lifts (swells) can be suppressed.

  Moreover, after insertion, the pressure which acts between a stator core and a stator holder will be transmitted via a guide member. For this reason, since the pressure concentrates on the guide member, it becomes easy to maintain the pressed state of the stator core by the stator holder with a relatively small force.

  The guide member may include an inclined portion that protrudes in the axial direction from the radially outer side of the outer peripheral edge of the end face of the stator core and is inclined toward the rotation axis of the rotating electrical machine. Thereby, at the time of insertion, the contact portion of the inclined portion with the inner peripheral surface of the stator holder gradually increases in diameter, and as a result, the positioning accuracy between the outer peripheral surface of the stator core and the inner peripheral surface of the stator holder is improved. It becomes possible. For this reason, the positioning accuracy between the end surface of the stator core and the inner peripheral surface of the stator holder at the start of insertion can be improved. Therefore, when the outer peripheral edge (corner) of the end face of the stator core is in contact with the inner peripheral face of the stator holder at the start of insertion, it is possible to prevent one from scraping off (staking) the other.

  The guide member may have the same hardness as the inner peripheral surface of the stator holder. Thereby, it is possible to suppress the generation of burrs due to the contact between the guide member and the inner peripheral surface of the stator holder.

  The stator core may be configured by arranging a plurality of divided cores having substantially the same shape in an annular shape, and the guide member may be disposed in each of the plurality of divided cores. Thereby, the pressure from the stator holder which acts on the stator core via the guide member is distributed to each divided core. For this reason, it becomes possible to strengthen the holding of the stator core by the stator holder.

  The guide member may be disposed in a region of the split core where the magnetic flux density is relatively low when a wire is wound around the split core via an insulating member and a magnetic flux is formed by energization. As a result, it is possible to reduce power loss caused by the guide member when the rotating electrical machine operates.

A method for manufacturing a stator core fixing structure according to the present invention is a method for manufacturing a stator core fixing structure including a stator core and a stator holder that holds the stator core in a pressed state on the outer periphery of the stator core,
Inserting the stator core into the stator holder in a state where a guide member extending in the axial direction of the rotating electrical machine and forming a gap between the stator core and the stator holder is disposed on the outer peripheral surface of the stator core. Features.

A method for manufacturing a stator core fixing structure according to the present invention is a method for manufacturing a stator core fixing structure including a stator core and a stator holder that holds the stator core in a pressed state on the outer periphery of the stator core,
At least the guide member including an outer peripheral edge of the end face of the stator core in the axial direction of the rotating electrical machine or an inclined portion that protrudes in the axial direction from a radially outer side than the outer peripheral edge and is inclined toward the rotating shaft of the rotating electrical machine. Provided on the end face of
The stator core is inserted into the stator holder from the guide member side.

  According to the present invention, when the stator core is inserted into the stator holder, the contact portion of the inclined portion with the inner peripheral surface of the stator holder gradually increases in diameter, so that the outer peripheral surface of the stator core and the inner surface of the stator holder are increased. It becomes possible to improve the positioning accuracy of the peripheral surface. For this reason, it is possible to improve the positioning accuracy between the outer peripheral edge (corner) of the end surface of the stator core and the inner peripheral surface of the stator holder at the start of insertion. Therefore, when the outer peripheral edge (corner) of the end face of the stator core is in contact with the inner peripheral face of the stator holder at the start of insertion, it is possible to prevent one from scraping off (staking) the other.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to solve suitably the problem accompanying press injection of the stator core with respect to a stator holder.

1 is a front view schematically showing a motor including a stator core fixing structure (hereinafter also referred to as “structure”) according to an embodiment of the present invention. 2A is a partial front view of the structure according to the embodiment, and FIG. 2B is a partially enlarged view of FIG. 2A. It is sectional drawing in the III-III line of FIG. 2A. In the said embodiment, it is a figure which shows an example of distribution of the magnetic flux density at the time of operating the said motor. It is a flowchart which shows the basic flow which manufactures the stator of the said embodiment. In the said embodiment, it is a fragmentary sectional view which shows a mode that a stator core is press-fit in a stator holder. FIG. 7A is a partial cross-sectional view illustrating a state at the start of press-fitting of the stator core into the stator holder in the comparative example. FIG. 7B is a partially enlarged view of FIG. 7A. FIG. 7C is a diagram illustrating the stator core when the viewpoint of FIG. 7B is moved by 90 ° in the circumferential direction. FIG. 8A is a partial cross-sectional view showing a state during press-fitting of the stator core into the stator holder in the comparative example. FIG. 8B is a partially enlarged view of FIG. 8A. FIG. 8C is a diagram showing the stator core when the viewpoint of FIG. 8B is moved by 90 ° in the circumferential direction. FIG. 9A is a partial cross-sectional view showing a state at the end of press-fitting of the stator core into the stator holder in the comparative example. FIG. 9B is a partially enlarged view of FIG. 9A. FIG. 9C is a diagram illustrating the stator core when the viewpoint of FIG. 9B is moved by 90 ° in the circumferential direction.

A. One Embodiment <A-1. Configuration>
[A-1-1. overall structure]
FIG. 1 is a front view schematically showing a motor 10 including a stator core fixing structure 16 (hereinafter also referred to as “structure 16”) according to an embodiment of the present invention. The motor 10 (rotary electric machine) includes a rotor 12 and a stator 14. The stator core fixing structure 16 is included in the stator 14. The motor 10 of the present embodiment is a three-phase AC method, but may be another AC method or a DC method. The motor 10 is a brushless type, but may be a brush type.

[A-1-2. Rotor 12]
The rotor 12 has a rotor shaft 20 and a rotor core 22. A permanent magnet 24 (FIG. 4) is disposed inside the rotor core 22. The rotor core 22 may be configured without including a permanent magnet, like a reluctance motor type rotor.

[A-1-3. Stator 14 (Stator Core Fixing Structure 16)]
(A-1-3-1. Overall configuration of stator 14)
2A is a partial front view of the stator core fixing structure 16 according to the present embodiment, and FIG. 2B is a partially enlarged view of FIG. 2A. 3 is a cross-sectional view taken along line III-III in FIG. 2A. The stator 14 includes a stator core 30 (FIGS. 2A to 3), a plurality of insulators 32 (insulating members) (FIG. 1), a plurality of stator coils 34 (hereinafter also referred to as “coils 34”) (FIG. 1), The stator holder 36 (holding member) (FIGS. 1 to 3) and the press-fitting guide 38 (FIGS. 2A to 3) are included. The stator core fixing structure 16 includes a stator core 30, a stator holder 36, and a press-fit guide 38. In FIGS. 2A, 2B, and 3, the insulator 32 and the coil 34 are not shown.

(A-1-3-3. Stator core 30)
The stator core 30 (hereinafter also referred to as “core 30”) includes an annular yoke portion 50 and a plurality of teeth 52 protruding from the yoke portion 50 toward the inner diameter side. The core 30 of the present embodiment is configured by arranging a plurality of divided cores 54 having substantially the same shape in an annular shape (FIG. 2A). Each divided core 54 includes a divided yoke portion 56 that forms the yoke portion 50 and one tooth 52. The split core 54 is composed of a plurality of laminated steel plates.

  The laminated steel plate of this embodiment is a press-molded product. Or a laminated steel plate can also be formed by other methods (for example, casting, forging, or cutting). Instead of using the split core 54, the stator core 30 may be configured integrally. In the state in which the stator core 30 is constituted by the divided cores 54, the outer peripheral surface 58 of the core 30 is designed to be a smooth curve having no irregularities (however, irregularities due to dimensional tolerances of each laminated steel sheet are generated. End up.) For this reason, the convex part like the core convex part 25 (FIG. 1, FIG. 6, etc. of patent document 1) of patent document 1 is not formed.

  As shown in FIG. 2B, each split core 54 (or laminated steel plate) is formed with a groove 60 for placing the press-fit guide 38 therein. The groove portion 60 is formed at the center of each divided core 54 in the circumferential direction.

(A-1-3-3. Insulator 32 and coil 34)
The insulator 32 is attached to the tooth 52 and insulates the stator core 30 and the coil 34. The coil 34 is configured by a wire (for example, an insulation-coated copper wire) wound around each of the plurality of insulators 32.

(A-1-3-4. Stator holder 36)
The stator holder 36 (hereinafter also referred to as “holder 36”) is an annular member that holds the core 30 in a pressed state on the outer periphery of the stator core 30. In other words, the outer peripheral surface 58 of the core 30 is held in a pressed state by the inner peripheral surface 70 of the holder 36. However, in this embodiment, since the press-fitting guide 38 exists, the core 30 and the holder 36 are maintained in a non-contact state.

  The holder 36 of the present embodiment is made of metal (for example, made of cold rolled steel plate). The holder 36 of the present embodiment is a press-molded product, but can be formed by other methods (for example, casting, forging, or cutting). Since the holder 36 is composed of the same material as a whole, it basically has the same material strength. Alternatively, the material strength of the holder 36 may be partially changed by performing a process such as quenching on a part of the holder 36 (inner peripheral surface 70 or the like).

  As shown in FIG. 3, the holder 36 includes a cylindrical portion 80 and a flange 82. An annular inclined portion 84 is formed at the connecting portion between the cylindrical portion 80 and the flange 82, and the inner diameter becomes smaller toward the cylindrical portion 80 side.

  The cylindrical portion 80 is a cylindrical member that holds the stator core 30 in a state where the stator core 30 is fitted therein. The inner peripheral surface 70 of the cylindrical portion 80 (or the holder 36) is designed to be a smooth curved surface having no irregularities. For this reason, the convex part like the holder convex part 27 of patent document 1 is not formed.

  The flange 82 is on the outer diameter side (R2 direction) (more specifically, the rotation axis Ax (FIG. 1) on one end side (right side in FIG. 3) of the cylindrical portion 80 in the axial directions X1 and X2 of the motor 10. ) Projecting substantially perpendicular to). The flange 82 is provided with a bolt hole (not shown) for inserting a bolt (not shown) for fixing the holder 36 to a housing (not shown).

  As will be described in detail later, the core 30 is press-fitted into the holder 36 via a press-fitting guide 38. Therefore, before press-fitting, the sum of the radius Rh [mm] of the inner peripheral surface 70 of the holder 36 and the height Hp of the press-fitting guide 38 (the height of the portion protruding from the holder 36 when fixed to the holder 36) is the core 30. Is shorter than the radius Rc of the outer peripheral surface 58 by the amount of the fastening allowance Dr (Rh + Hp = Rc−Dr).

(A-1-3-5. Press-fit guide 38)
The press-fit guide 38 (guide member) has a function (guide function) for guiding the core 30 into the holder 36 when the core 30 is press-fitted into the holder 36, and a function for transmitting pressure between the core 30 and the holder 36 after press-fit ( Pressure transmission function). The guide function includes an entrance guide function for guiding the end surface 90 of the core 30 on the press-fitting side to the entrance of the hole 92 (FIG. 2B) formed in the holder 36, and the end surface 90 of the core 30 in the hole 92. And an internal guide function for guiding the inside of the holder 36 after entering.

  FIG. 4 is a diagram illustrating an example of the distribution of magnetic flux density when the motor 10 is operated in the present embodiment. In FIG. 4, the press-fitting guide 38 is omitted. As shown in FIGS. 2A, 2 </ b> B, and 3, each press-fitting guide 38 is disposed between the outer peripheral surface 58 of the stator core 30 and the inner peripheral surface 70 of the stator holder 36. In other words, in this embodiment, the press-fit guide 38 is disposed in each divided core 54. Thereby, the pressure from the holder 36 is easily dispersed evenly in the stator core 30. In the position of the press-fit guide 38 of the present embodiment, a groove portion 60 is formed in each of the plurality of split cores 54, and the press-fit guide 38 is disposed in the groove portion 60. Thereby, the press-fitting guide 38 can be easily positioned.

  Further, as shown in FIG. 4, the position of the groove 60 (in other words, the position of the press-fit guide 38) is determined when the wire is wound around the split core 54 via the insulator 32 and magnetic flux is formed by energization. 54 is in a region where the magnetic flux density is relatively low. As the motor 10 rotates, the distribution of magnetic flux density changes. The “magnetic flux density” here means an average value when the motor 10 makes one rotation at a predetermined speed. In this embodiment, the “region where the magnetic flux density is relatively low” refers to a position (more specifically, radial direction C1) corresponding to the tooth 52 of the split core 54 when viewed in the axial directions X1 and X2 of the motor 10. , A position where the center line of the tooth 52 and the center line of the press-fitting guide 38 coincide with each other).

  The press-fit guide 38 of the present embodiment is fixed to the core 30 with an adhesive. Therefore, in FIG. 3, an adhesive layer 94 (FIG. 2B) is formed between the core 30 and the press-fit guide 38.

  As shown in FIG. 3, the press-fitting guide 38 includes a front guide part 100 (hereinafter also referred to as “guide part 100”) that realizes the entrance guide function, and a back part that realizes the internal guide function and the pressure transmission function. A side guide portion 102 (hereinafter also referred to as “guide portion 102” or “pressure transmission portion 102”). The press-fit guide 38 has the same hardness as the inner peripheral surface 70 and the annular inclined portion 84 of the stator holder 36.

  The near-side guide portion 100 includes an inclined portion 106 that protrudes in the axial direction X1 from the radially outer side of the outer peripheral edge 104 of the end surface 90 of the stator core 30 and is inclined toward the rotation axis Ax (FIG. 1) of the motor 10. In FIG. 3 showing a cross section taken along line III-III in FIG. 2A (in other words, a cross section showing a plane including the rotation axis Ax), the inclined portion 106 has an arc shape (or has an arc region). As shown in FIG. 3, a part of the front side guide portion 100 is in contact with the end surface 90 of the core 30 in the axial directions X1 and X2. For this reason, the positioning of the press-fit guide 38 in the axial directions X1 and X2 and the radial directions R1 and R2 is facilitated.

  As shown in FIG. 2B, when viewed in the axial directions X <b> 1 and X <b> 2, the back side guide portion 102 has a circular arc shape that is convex toward the holder 36. Further, as shown in FIG. 3, in the cross section showing the plane including the rotation axis Ax (FIG. 1), the back side guide portion 102 extends in the axial directions X1 and X2. Therefore, a gap 108 (FIG. 2B) in which the hole 92 remains is formed between the core 30 and the holder 36 during and after the press-fitting, and the core 30 and the holder 36 are kept in a non-contact state.

<A-2. Manufacturing method>
[A-2-1. Basic flow of manufacturing the stator 14]
FIG. 5 is a flowchart showing a basic flow for manufacturing the stator 14 of the present embodiment. FIG. 6 is a partial cross-sectional view showing how the stator core 30 is press-fitted into the stator holder 36 in the present embodiment. Note that the directions x1, x2, y1, y2, z1, and z2 in FIG. 6 (and FIGS. 7A to 9C described later) are different from X1, X2, Y1, Y2, Z1, and Z2 in FIGS. I want. The basic flow shown in FIG. 5 shows an example of the order in which the stator 14 is manufactured, and the stator 14 may be manufactured in another order. In the following description, all the operations are performed by the stator manufacturing apparatus 300 (FIG. 6), but some or all of the operations can be performed by the operator. It should be noted that FIG. 6 shows only a part of the stator manufacturing apparatus 300, and that each operation of FIG. 5 is not performed only by the configuration appearing in FIG.

  In step S <b> 1, the stator manufacturing apparatus 300 (hereinafter also referred to as “manufacturing apparatus 300”) forms the split core 54 by stacking steel plates. In step S <b> 2, the manufacturing apparatus 300 arranges the insulator 32 around the split core 54. Note that the insulator 32 may be disposed after the core 30 is press-fitted into the holder 36. In step S <b> 3, the manufacturing apparatus 300 fixes the press-fit guide 38 to each divided core 54 with an adhesive.

  In step S4, the manufacturing apparatus 300 forms the stator core 30 by arranging the divided cores 54 in an annular shape. In step S <b> 5, the manufacturing apparatus 300 forms a coil 34 by winding a wire around each tooth 52 covered with the insulator 32.

  In step S <b> 6, the manufacturing apparatus 300 press-fits the stator core 30 into the stator holder 36. Thereby, the basic structure of the stator 14 is completed. The press-fitting in the present embodiment is performed at room temperature, but may be press-fitted in a state where the stator core 30 is cooled and contracted as necessary. Or you may press-fit in the state which heated the holder 36 and expanded.

[A-2-2. Press-fit of stator core 30 to stator holder 36]
As described above, FIG. 6 is a partial cross-sectional view showing how the stator core 30 is press-fitted into the stator holder 36 in the present embodiment. As shown in FIG. 6, when the stator core 30 is press-fitted into the stator holder 36, the stator core 30 is sandwiched by the plurality of first positioning rods 302 and the plurality of second positioning rods 304 of the manufacturing apparatus 300 (see FIG. 6). In FIG. 6, only one first positioning rod 302 and one second positioning rod 304 are shown. In this state, the stator holder 36 is brought close to the core 30 by a pressing member 306 connected to a driving device (not shown). As a result, the core 30 is press-fitted into the holder 36.

  In addition, as above-mentioned, each laminated steel plate of this embodiment is a press-molded product. For this reason, in FIG. 6, it should be noted that the outer peripheral edge 104 of the end surface 90 of the stator core 30 has corners that are hardly rounded.

  As described above, in this embodiment, the press-fit guide 38 is fixed to the stator core 30. For this reason, when the stator core 30 is press-fitted into the holder 36, first, the front guide portion 100 of the press-fit guide 38 comes into contact with the annular inclined portion 84 of the holder 36. When the core 30 is press-fitted into the holder 36, the guide unit 100 enters the holder 36 along the annular inclined portion 84. At this time, since both the guide portion 100 and the annular inclined portion 84 are curved, it is difficult for burrs to occur in both the guide portion 100 and the annular inclined portion 84. Further, the holder 36 is increased in diameter toward the radially outer side (R2 direction) with the press-fitting of the guide portion 100.

  If the front guide portion 100 enters the inside of the holder 36 and then press-fitting is further advanced, then the back side guide portion 102 (pressure transmission portion) of the press-fit guide 38 and the core 30 enter the inside of the holder 36 ( Strictly speaking, the core 30 is press-fitted into the holder 36 from here. At this time, the stator core 30 is positioned with respect to the holder 36 by the back guide portion 102. For this reason, the outer peripheral edge 104 of the end surface 90 of the core 30 is difficult to contact the inner peripheral surface 70 of the holder 36.

  Further, even after the outer peripheral edge 104 of the end surface 90 enters the inside of the holder 36, the outer peripheral surface 58 of the core 30 remains separated from the inner peripheral surface 70 of the holder 36 because the rear guide portion 102 exists. . For this reason, the outer peripheral surface 58 or the inner peripheral surface 70 is not easily damaged due to contact between the outer peripheral surface 58 of the core 30 and the inner peripheral surface 70 of the holder 36.

  Furthermore, the press-fitting guide 38 is not disposed without a gap on the entire circumference of the core 30 but is disposed on the entire circumference of the core 30 with a predetermined interval (see FIG. 2A). For this reason, the pressure acting between the core 30 and the holder 36 at the time of press-fitting is concentrated on the press-fitting guide 38. Therefore, the pressure applied to the press-fit guide 38 is larger than when the press-fit guide 38 is arranged on the entire circumference of the core 30 without a gap. Therefore, the core 30 can be pressed into the holder 36 even if the pressing force generated by the pressing member 306 is relatively small.

  Due to the above-described action, burrs are hardly generated on the outer peripheral edge 104 of the end face 90 of the core 30 or the outer peripheral face 58 of the core 30. In addition, it is possible to suppress the floating (swelling) of the core 30 that occurs in the comparative example described later with reference to FIGS. 7A to 9C.

<A-3. Problems that may occur in the comparative example>
FIG. 7A to FIG. 9C are diagrams for explaining problems that may occur in the stator core fixing structure 516 (hereinafter also referred to as “structure 516”) according to the comparative example. That is, FIG. 7A is a partial cross-sectional view showing a state at the start of press-fitting of the stator core 30 into the stator holder 36 in the comparative example. FIG. 7B is a partially enlarged view of FIG. 7A. FIG. 7C is a diagram illustrating the stator core 30 when the viewpoint of FIG. 7B is moved 90 ° in the circumferential direction. FIG. 8A is a partial cross-sectional view showing a state during press-fitting of the stator core 30 into the stator holder 36 in the comparative example. FIG. 8B is a partially enlarged view of FIG. 8A. FIG. 8C is a diagram illustrating the stator core 30 when the viewpoint of FIG. 8B is moved by 90 ° in the circumferential direction. FIG. 9A is a partial cross-sectional view showing a state at the end of press-fitting of the stator core 30 into the stator holder 36 in the comparative example. FIG. 9B is a partially enlarged view of FIG. 9A. FIG. 9C is a diagram showing the stator core 30 when the viewpoint of FIG. 9B is moved by 90 °.

  The structure body 516 according to the comparative example does not have the press-fit guide 38. For this reason, in the structure 516 according to the comparative example, the outer peripheral surface 58 of the stator core 30 and the inner peripheral surface 70 of the stator holder 36 are in direct contact. Moreover, the laminated steel plate which comprises the stator core 30 of a comparative example is a press-molded product similarly to this embodiment. For this reason, in FIGS. 7A and 7B, the outer peripheral edge 104 of the end surface 90 of the stator core 30 has corners that are hardly rounded.

  From the above factors and the like, in the comparative example, as shown in FIGS. 7A to 7C, when the core 30 starts to press into the holder 36, the outer peripheral edge 104 of the end surface 90 of the core 30 is Part of the inner peripheral surface 70 is scraped off. Along with this, a hard protrusion 120 is formed on the holder 36.

  When press-fitting is advanced in this state, as shown in FIGS. 8A to 8C, abrasive wear occurs in which the protrusion 120 of the holder 36 scrapes the core 30. A piece 122 of the core 30 generated by the abrasive wear moves together with the protrusion 120 of the holder 36. Due to the movement of the fragments 122, the core 30 has a scratch 124. In addition, the abrasive wear continues until the end of press-fitting, and the fragments 122 of the core 30 grow greatly. As a result, a part (end surface 110 opposite to the end surface 90) of the core 30 (laminated steel plate) pressed against the broken piece 122 of the core 30 and the protrusion 120 of the holder 36 is in the press-fitting direction (the downward direction of FIGS. 9A to 9C). ) Will rise up towards you.

  As described above, in the present invention, by providing the press-fitting guide 38, it is possible to suppress the floating of the core 30 (laminated steel plate).

<A-4. Effects of this embodiment>
As described above, according to the present embodiment, the press-fit guide 38 keeps the stator core 30 and the stator holder 36 in a non-contact state (FIGS. 2A, 2B, and 3). Accordingly, when the stator core 30 is press-fitted into the stator holder 36, the contact between the outer peripheral surface 58 of the core 30 and the inner peripheral surface 70 of the holder 36 is suppressed, so that the inner surfaces of the outer peripheral surface 58 of the core 30 and the holder 36 are reduced. Occurrence of burrs or lifting (swelling) of the core 30 due to contact with the peripheral surface 70 can be suppressed.

  In addition, after press-fitting, the pressure acting between the stator core 30 and the stator holder 36 is transmitted via the press-fitting guide 38 (FIGS. 2A, 2B, and 3). For this reason, since the pressure concentrates on the press-fit guide 38, it is easy to maintain the pressed state of the stator core 30 by the stator holder 36 with a relatively small force.

  In the present embodiment, the press-fitting guide 38 includes an inclined portion 106 that protrudes in the axial direction X1 from the radially outer side of the outer peripheral edge 104 of the end surface 90 of the stator core 30 and is inclined toward the rotation axis Ax of the motor 10 (FIG. 3). ). Thereby, at the time of press-fitting, the contact portion of the inclined portion 106 with the inner peripheral surface 70 of the stator holder 36 gradually increases in diameter, and the positioning accuracy of the outer peripheral surface 58 of the core 30 and the inner peripheral surface 70 of the holder 36 is increased. Can be improved. For this reason, it is possible to improve the positioning accuracy between the end surface 90 of the stator core 30 and the inner peripheral surface 70 of the stator holder 36 at the start of press-fitting. Accordingly, when the outer peripheral edge 104 (corner) of the end surface 90 of the core 30 comes into contact with the inner peripheral surface 70 of the holder 36 at the start of press-fitting, it is possible to prevent one from scraping off (staking) the other.

  In the present embodiment, the press-fitting guide 38 has a hardness comparable to that of the inner peripheral surface 70 of the stator holder 36. As a result, it is possible to suppress the occurrence of burrs caused by the contact between the press-fitting guide 38 and the inner peripheral surface 70 of the stator holder 36.

  In the present embodiment, the stator core 30 is configured by arranging a plurality of divided cores 54 having substantially the same shape in an annular shape (FIG. 2A), and the press-fitting guide 38 is disposed in each of the plurality of divided cores 54 (FIG. 2A). As a result, the pressure from the holder 36 acting on the core 30 via the press-fitting guide 38 is distributed to each divided core 54. For this reason, it becomes possible to strengthen the holding of the stator core 30 by the stator holder 36.

  In this embodiment, the press-fit guide 38 has a relatively low magnetic flux density in the split core 54 when a wire is wound around the split core 54 via the insulator 32 (insulating member) and a magnetic flux is formed by energization. Arranged in the region (FIG. 4). Thereby, it is possible to reduce the power loss caused by the press-fitting guide 38 when the motor 10 (rotating electric machine) is operated.

B. Modifications It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the description of the present specification. For example, the following configuration can be adopted.

<B-1. Applicable object>
In the above embodiment, the structural body 16 is applied to the stator 14 arranged outside the rotor 12 (FIG. 1). However, for example, when attention is paid to the guide function or pressure transmission function of the press-fitting guide 38, the structure 16 can be applied to the stator 14 disposed inside the rotor 12.

<B-2. Press-fit guide 38>
In the above embodiment, the press-fit guide 38 has both the front side guide part 100 (entrance guide function) and the back side guide part 102 (internal guide function and pressure transmission function) (FIG. 2B, FIG. 6 and the like). However, the press-fit guide 38 may have only one of the front side guide part 100 or the back side guide part 102. When the back side guide part 102 is not provided, the outer peripheral edge of the front side guide part 100 and the outer peripheral edge 104 of the core 30 may be aligned when viewed in the axial directions X1 and X2.

  In the above embodiment, the press-fit guide 38 has substantially the same hardness as the inner peripheral surface 70 of the holder 36. However, for example, when focusing on the guide function or pressure transmission function of the press-fit guide 38, the hardness of the press-fit guide 38 can be made different from that of the inner peripheral surface 70 of the holder 36.

  In the above embodiment, one press-fitting guide 38 is provided for each divided core 54 (FIG. 2A). However, for example, if attention is paid to the guide function or pressure transmission function of the press-fitting guide 38, the present invention is not limited to this. For example, when there is a connecting member that connects the split cores 54 in an annular shape, one press-fitting guide 38 can be provided for each combination of the plurality of split cores 54.

  In the above embodiment, the press-fitting guide 38 is disposed at a position corresponding to the tooth 52 of the split core 54 (FIG. 2A). However, for example, if attention is paid to the guide function or pressure transmission function of the press-fitting guide 38, the present invention is not limited to this. For example, when viewed in the axial direction, the center line of the press-fitting guide 38 in the radial direction may be disposed at a position that is displaced from the center line of the tooth 52.

  In the embodiment described above, the press-fit guide 38 has completely entered the groove 60 in the circumferential directions C1 and C2 (FIG. 2B). However, for example, if attention is paid to the guide function or pressure transmission function of the press-fitting guide 38, the present invention is not limited to this. For example, a configuration in which a part of the press-fitting guide 38 protrudes from the groove 60 in the circumferential directions C1 and C2 is also possible. Alternatively, the press-fit guide 38 can be fixed to the core 30 without forming the groove portion 60 in the core 30.

  In FIG. 3 (cross section showing a plane including the rotation axis Ax) of the above embodiment, the inclined portion 106 has an arc shape. However, for example, if attention is paid to the guide function of the press-fitting guide 38, the present invention is not limited to this. For example, the inclined portion 106 can be a truncated cone.

  In the above embodiment, the press-fitting guide 38 is fixed to the core 30 with an adhesive (S3 in FIG. 5). However, for example, if attention is paid to the guide function or pressure transmission function of the press-fitting guide 38, the present invention is not limited to this. For example, the press-fitting guide 38 may be fixed by press-fitting into the groove portion 60 of the core 30. Alternatively, the press-fit guide 38 can be fixed to the core 30 by welding. Alternatively, the press-fit guide 38 can be formed on the laminated steel plate itself constituting the split core 54 or the stator core 30.

  In the above embodiment, the press-fitting guide 38 is used as a press-fitting guide member (FIG. 6 and the like). However, for example, if attention is paid to the guide function or pressure transmission function of the press-fitting guide 38, the present invention is not limited to this. For example, in the case of performing a cold fitting that fits into the holder 36 in a state in which the core 30 is cooled and contracted, the press-fitting guide 38 (guide member) can be used to exhibit a guide function or a pressure transmission function. Alternatively, when performing shrink fitting in which the core 30 is fitted in the holder 36 in a state where the holder 36 is heated and expanded, a press-fitting guide 38 (guide member) is used to exhibit a guide function or a pressure transmission function. You can also.

DESCRIPTION OF SYMBOLS 10 ... Motor (rotary electric machine) 16 ... Stator core fixed structure 30 ... Stator core 32 ... Insulator (insulating member)
36 ... Stator holder 38 ... Press-fit guide (guide member)
54 ... Split core 58 ... Stator core outer peripheral surface 70 ... Stator holder inner peripheral surface 90 ... Stator core end surface 104 ... End surface outer peripheral edge 106 ... Inclined portion Ax ... Rotating shaft C1, C2 ... Axial direction

Claims (7)

A stator core;
A stator core fixing structure comprising: a stator holder that holds the stator core in a pressed state on an outer periphery of the stator core;
A guide member extending in the axial direction of the rotating electrical machine between the outer peripheral surface of the stator core and the inner peripheral surface of the stator holder, and maintaining a non-contact state between the stator core and the stator holder; Stator core fixing structure. The stator core fixing structure according to claim 1,
The said guide member is provided with the inclination part which protrudes in the said axial direction from the radial direction outer side rather than the outer periphery of the end surface of the said stator core, and inclines toward the rotating shaft of the said rotary electric machine. The stator core fixed structure characterized by the above-mentioned. In the stator core fixing structure according to claim 1 or 2,
The guide member has a hardness comparable to that of the inner peripheral surface of the stator holder. In the stator core fixing structure according to any one of claims 1 to 3,
The stator core is composed of a plurality of substantially identically divided cores arranged in an annular shape,
The stator core fixing structure, wherein the guide member is disposed in each of the plurality of divided cores. In the stator core fixing structure according to claim 4,
The guide member is disposed in a region of the split core where the magnetic flux density is relatively low when a wire is wound around the split core via an insulating member and a magnetic flux is formed by energization. Stator core fixing structure. A stator core fixing structure comprising a stator core and a stator holder that holds the stator core in a pressed state on the outer periphery of the stator core,
Inserting the stator core into the stator holder in a state where a guide member extending in the axial direction of the rotating electrical machine and forming a gap between the stator core and the stator holder is disposed on the outer peripheral surface of the stator core. A manufacturing method of a stator core fixing structure characterized by the above. A stator core fixing structure comprising a stator core and a stator holder that holds the stator core in a pressed state on the outer periphery of the stator core,
At least the guide member including an outer peripheral edge of the end face of the stator core in the axial direction of the rotating electrical machine or an inclined portion that protrudes in the axial direction from a radially outer side than the outer peripheral edge and is inclined toward the rotating shaft of the rotating electrical machine. Provided on the end face of
The stator core is inserted into the stator holder from the guide member side. A method of manufacturing a stator core fixing structure.

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