TWI715194B - Rotating electric machine and manufacturing method thereof - Google Patents

Abstract

This invention provides a rotating electric machine and a manufacturing method thereof, which can reduce the frictional hot melt of the outer peripheral surface of the shaft when pressing. The rotating electrical machine (100) includes a stator (10), a rotor (20), and a shaft (30). The rotor (20) is arranged with a first rotor core portion (21a) and a second rotor core portion (21b) arranged side by side in an axial direction. The first rotor core portion (21a) is provided on the inner circumferential surface of a first through hole (211a) in which the shaft (30) is pressed, and a first concave portion (212a) and a first convex portion (213a) are alternately provided along a circumferential direction. The second rotor core portion (21b) is provided on the inner circumferential surface of a second through hole (211b) in which the shaft (30) is pressed, and a second concave portion (212b) and a second convex portion (213b) are alternately provided along a circumferential direction. When viewed in the axial direction, in the first rotor core portion (21a) and the second rotor core portion (21b), the first concave portion (212a) is aligned with the second convex portion (213b) and the first convex portion (213a) is aligned with the second concave portion (212b).

Description

Rotating electric machine and its manufacturing method

This case is about a rotating electric machine and its manufacturing method.

Conventionally, there is known an inner rotor type rotating electric machine in which a rotor is arranged on the radial inner side of the stator and the shaft is fitted to the rotor. The rotor of this type of rotating electric machine has a rotor core and magnets laminated with thin plates of magnetic material, and a through hole for the shaft to be fitted is formed in the radial center of the rotor core. The electromagnetic force generated between the rotor and the stator provides rotational torque to the rotor and rotates with the shaft. At this time, in order to transmit the rotational torque of the rotor to the shaft, the tight part between the rotor and the shaft needs to have strong torsional strength.

As one of the methods for firmly embedding the rotor and the shaft, there is a press-fitting method, but for press-fitting, there are sometimes errors in the machining accuracy of the shaft outer diameter and the inner diameter of the rotor core. The situation of the problem. For example, when the inner diameter of the rotor core is larger than the outer diameter of the shaft, the torsion strength of the clamping part will be insufficient, so that the rotational torque cannot be transmitted to the shaft. Conversely, if the inner diameter of the rotor core is smaller than the outer diameter of the shaft, friction and heat fusion will occur on the outer circumferential surface of the shaft during press-fitting, increasing the press-fitting load and causing the shaft to buckle. In order to improve the machining accuracy of the rotor and the shaft, it is necessary to perform finishing such as calendering, but there is a problem that the manufacturing cost increases and the productivity deteriorates. question. In contrast to this, for example, Patent Document 1 discloses a rotor structure in which the hole wall of the central hole of the rotor core is composed of unevenness provided with a plurality of teeth. When the shaft is pressed into the central hole, the deformation of the teeth is caused. And easily absorb errors in machining accuracy.

[Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 4-285446

However, when the part in contact between the shaft and the rotor core continuously extends in the axial direction, as the shaft is pressed in, there is a possibility that the outer peripheral surface of the shaft and the inner peripheral surface of the rotor core will be frictionally fused due to drag friction under contact. The subject of sex.

This project was developed to solve the above-mentioned problems, and the purpose is to provide a rotating electric machine that reduces the frictional heat fusion on the outer peripheral surface of the shaft when the pressure is applied, and a manufacturing method thereof.

The rotating electric machine in this case has a shaft, a rotor, and a stator. The rotor has a first rotor core portion and a second rotor core portion. The first rotor core portion is formed by stacking a plurality of first core pieces connected in the axial direction of the shaft, and in the radial direction of the first core piece The inner peripheral surface of the first through hole of the press-fit shaft of the central part is alternately formed with first convex parts contacting the shaft and first concave parts not contacting the shaft along the circumferential direction; the second rotor core part is along the The shaft is composed of a plurality of second core pieces laminated in the axial direction of the shaft, and the second core piece is pressed into the shaft at the radial center of the second core piece. The inner peripheral surface of the through hole is alternately formed with second convex portions in contact with the shaft and second concave portions not in contact with the shaft along the circumferential direction; the first rotor core portion and the second rotor core portion are the first concave portions respectively It is aligned with the circumferential position of the second convex portion and the circumferential position of the first convex portion and the second concave portion and arranged side by side in the axial direction, and is provided along the circumferential direction of the first rotor core portion and the second rotor core portion magnet. The stator system is arranged on the radially outer side with respect to the rotor.

The manufacturing method of the rotating electric machine in this case includes the core piece forming step, which is to form the first through holes in the radial center of the first core pieces of the plurality of pieces so that the first through holes are alternately provided along the circumferential direction on the inner peripheral surface. The concave portion and the first convex portion are formed by punching, and the second through-holes in the radial center portion of the second core pieces of the plural pieces are alternately provided with the second concave portions and the The second convex portion is punched and formed; the rotor core portion forming step is to laminate a plurality of first core pieces such that the first concave portion and the first convex portion are connected in the axial direction to form the first rotor core portion, And a plurality of second core pieces are layered in such a way that the second concave portion and the second convex portion are respectively connected in the axial direction to form the second rotor core portion; the shaft pressing step is based on the circumference of the first concave portion and the second convex portion The direction position and the circumferential position of the first convex part and the second concave part are aligned respectively, the shaft is pressed into the first through hole and the second through hole; the magnet bonding step is along the first rotor core part and the first The magnets are adhered to the circumferential direction of the two rotor core parts; and the stator assembly step is to assemble the stator to the radially outer side of the first rotor core part and the second rotor core part.

According to the rotating electric machine of the present invention, because the first rotor core portion and the second rotor core portion are aligned in the circumferential direction of the first concave portion and the second convex portion, and the first convex portion and the second concave portion are aligned in the circumferential direction The arrangement is arranged side by side in the axial direction, whereby when the shaft is pressed into the rotor core, the contact surface of the shaft and the rotor core is different along the axial direction, so the frictional heat fusion on the outer peripheral surface of the shaft can be reduced.

In addition, according to the manufacturing method of the rotating electric machine of the present application, the circumferential positions of the first concave portion and the second convex portion can be aligned and the circumferential positions of the first convex portion and the second concave portion can be aligned by simple steps , The first rotor core part and the second rotor core part are arranged side by side in the axial direction, which can reduce the friction and heat fusion of the outer peripheral surface of the shaft.

10: Stator

11: Stator core

12: Coil

20: Rotor

21: Rotor core

21a: The first rotor core

21b: The second rotor core

21c: The third rotor core

22: Magnet

30: axis

31a, 31b: part

50, 50a, 50b: press-in fixed fixture

51: pin

51a, 51b: first pin

52a, 52b: second pin

100: Rotating motor

101: Bearing

210a: The first core piece

210b: The second core piece

211a: first through hole

211b: second through hole

211c: third through hole

212a: The first recess

212b: second recess

212c: third recess

213a: the first convex part

213b: second convex part

213c: third convex

214a: The first positioning hole

214b: second positioning hole

214c: third positioning hole

2141a, 2141b: first hole

2142a, 2142b: second hole

O: Rotation center

M, N, P, Q: straight line

ST101~ST105, ST201~ST205, ST202a, ST202b: steps

Fig. 1 is a cross-sectional view showing the schematic configuration of the rotating electric machine according to the first embodiment.

Fig. 2 is a side view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the first embodiment.

Fig. 3 is a cross-sectional view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the first embodiment.

Fig. 4 is a cross-sectional view showing the schematic configuration of the rotor core portion of the rotating electric machine according to the first embodiment.

Fig. 5 is a flowchart showing the manufacturing process of the rotating electric machine according to the first embodiment.

Fig. 6 is an explanatory diagram for explaining the manufacturing method of the rotating electric machine according to the first embodiment.

Fig. 7 is an explanatory diagram for explaining the manufacturing method of the rotating electric machine according to the first embodiment.

Fig. 8 is a cross-sectional view showing the schematic configuration of another example of the rotor core portion of the rotating electric machine according to the first embodiment.

Fig. 9 is a cross-sectional view showing the schematic configuration of another example of the rotor core portion of the rotating electric machine according to the first embodiment.

Fig. 10 is a cross-sectional view showing the schematic configuration of another example of the rotor core portion of the rotating electric machine according to the first embodiment.

Fig. 11 is a cross-sectional view showing the schematic configuration of the rotor core portion of the rotating electric machine according to the second embodiment.

Fig. 12 is a flowchart showing the manufacturing process of the rotating electric machine of the second embodiment.

Fig. 13 is an explanatory diagram for explaining the manufacturing method of the rotating electric machine according to the second embodiment.

Fig. 14 is a cross-sectional view showing the schematic configuration of the rotor core portion of the rotating electric machine according to the third embodiment.

Fig. 15 is an explanatory diagram for explaining the manufacturing method of the rotating electric machine according to the third embodiment.

Fig. 16 is an explanatory diagram for explaining the manufacturing method of the rotating electric machine according to the third embodiment.

Fig. 17 is a cross-sectional view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the fourth embodiment.

Fig. 18 is a side view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the fifth embodiment.

Fig. 19 is a cross-sectional view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the fifth embodiment.

Hereinafter, the embodiment of this case will be described with reference to the drawings. The following is an example in which the rotating electric machine is a motor.

[Embodiment 1]

Fig. 1 is a cross-sectional view showing the schematic configuration of the rotating electric machine according to the first embodiment. As shown in Figure 1, the rotating electric machine 100 is of an inner rotor type and includes: a cylindrical stator 10; a rotor 20, The stator 10 is arranged on the radially inner side of the stator 10 with a predetermined air gap; and the shaft 30 is pressed against the radially inner side of the rotor 20 and is supported so as to be rotatable.

The rotating electric machine 100 rotates the rotor 20 and the shaft 30 through the interaction between the magnetic field generated by the stator 10 and the magnetic field generated by the rotor 20. In the following description, the direction along the rotation axis of the shaft 30 is described as the axial direction, the direction orthogonal to the rotation axis of the shaft 30 is described as the radial direction, and the direction in which the rotor 20 and the shaft 30 rotate are described as the circumferential direction. .

The stator 10 includes a stator core 11, which is a thin plate laminated with a magnetic material in the axial direction, and a coil 12, which is formed by winding a copper or aluminum conductor wire around the stator core 11.

The rotor 20 includes a rotor core 21 which is a thin plate laminated with a magnetic material in the axial direction, and a magnet 22 which is provided along the circumferential direction of the rotor core 21. The magnet 22 is, for example, magnetized to N poles and S poles alternately in the circumferential direction on the outer peripheral surface of the rotor core 21.

The shaft 30 is urged coaxially with the rotor 20 on the radial inner side of the rotor 20, and is supported by the bearing 101 so as to be able to rotate together with the rotor 20.

Fig. 2 is a side view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the first embodiment. In Fig. 2 and the following figures, part of the magnet 22 and the like are omitted for the sake of simplicity. As shown in FIG. 2, the rotor core 21 has a first rotor core portion 21 a and a second rotor core portion 21 b arranged side by side along the axial direction of the shaft 30. The first rotor core portion 21a and the second rotor core portion 21b are arranged in close contact with each other.

Fig. 3 is a cross-sectional view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the first embodiment. Fig. 3(A) is a cross-sectional view taken along the line A-A' in Fig. 2, and Fig. 3(B) is a cross-sectional view taken along the line B-B’ in Fig. 2. As shown in FIG. 3(A), the first rotor core portion 21a has a first through hole 211a at the center in the radial direction into which the shaft 30 can be press-fitted. Of the first through hole 211a The inner peripheral surface is alternately provided with a plurality of first concave portions 212a and first convex portions 213a extending in the axial direction along the circumferential direction. In a state where the shaft 30 is pressed into the first through hole 211a, the first convex portion 213a contacts the shaft 30 and fixes the shaft 30, and the first concave portion 212a does not contact the shaft 30.

It is preferable that a plurality of the first recesses 212a have the same width and be provided along the circumferential direction at equal intervals. Similarly, it is preferable that the plurality of first convex portions 213a have the same width of a single one and be arranged along the circumferential direction at equal intervals. Thereby, it can be used to apply the load of the tightening shaft 30 equally along the circumferential direction. Here, the "equal width" not only refers to the case where the respective widths are completely the same, but also includes the case where the widths are equal within a predetermined error range. In addition, the so-called equal interval not only refers to the case where the distances are completely equal, but also includes the case where they are equal within a predetermined error range. In the following description, the same applies when the width is equal or equal intervals.

The first rotor core portion 21a has a first positioning hole 214a in at least two locations away from the circumferential direction in the plane. The first positioning hole 214a penetrates along the axial direction of the first rotor core portion 21a. When the shaft 30 is press-fitted in the first rotor core portion 21a, the first concave portion 212a and the first convex portion 213a are positioned in the circumferential direction according to the first positioning hole 214a.

Moreover, as shown in FIG. 3(B), the second rotor core portion 21b has a second through hole 211b at the center in the radial direction into which the shaft 30 can be press-fitted. The inner peripheral surface of the second through hole 211b is alternately provided with a plurality of second concave portions 212b and second convex portions 213b extending in the axial direction along the circumferential direction. In a state where the shaft 30 is pressed into the second through hole 211b, the second convex portion 213b contacts the shaft 30 and fixes the shaft 30, and the second concave portion 212b does not contact the shaft 30.

It is preferable that a plurality of second concave portions 212b are provided with a single width equal to each other and at equal intervals along the circumferential direction. Similarly, the plurality of second convex portions 213b have a single width. It is preferable to set them at equal intervals along the circumferential direction. Thereby, it can be used to apply the load of the tightening shaft 30 equally along the circumferential direction.

The second rotor core portion 21b has a second positioning hole 214b in at least two locations away from the circumferential direction in the plane. The second positioning hole 214b penetrates along the axial direction of the second rotor core portion 21b. When the shaft 30 is press-fitted in the second rotor core portion 21b, the second concave portion 212b and the second convex portion 213b are positioned in the circumferential direction according to the second positioning hole 214b.

The first concave portion 212a of the first rotor core portion 21a and the second convex portion 213b of the second rotor core portion 21b are formed, for example, to have the same width and the same number. In addition, the first convex portion 213a of the first rotor core portion 21a and the second concave portion 212b of the second rotor core portion 21b are formed, for example, to have the same width and the same number.

When viewed from the axial direction of the shaft 30, the first rotor core portion 21a and the second rotor core portion 21b are arranged so that the circumferential positions of the first positioning hole 214a and the second positioning hole 214b are aligned. At this time, the circumferential positions of the first concave portion 212a of the first rotor core portion 21a and the second convex portion 213b of the second rotor core portion 21b are aligned. In addition, the circumferential positions of the first convex portion 213a of the first rotor core portion 21a and the second concave portion 212b of the second rotor core portion 21b are aligned.

That is, when viewed from the axial end of the shaft 30, in the circumferential range where the circumferential range of the first convex portion 213a overlaps the circumferential range of the second concave portion 212b, only the first convex portion 213a is in contact with The shaft contact surface of the first convex portion 213a is in surface contact with the shaft 30. When viewed from the axial end of the shaft 30, in the circumferential range in which the circumferential range of the second convex portion 213b overlaps the circumferential range of the first concave portion 212a, only the second convex portion 213b is in contact with the second convex portion 213b. The contact surface of the shaft 30 of the portion 213b is in surface contact with the shaft 30.

In this way, the first rotor core portion 21a and the second rotor core portion 21b are aligned with the circumferential positions of the first concave portion 212a and the second convex portion 213b and the circumferential positions of the first convex portion 213a and the second concave portion 212b, respectively. They are arranged side by side in the axial direction, whereby when the shaft 30 is pressed in, the contact surface of the shaft 30 with the rotor core 21 is different along the axial direction, so that the frictional heat fusion occurs on the outer peripheral surface of the shaft 30 when the pressure is reduced. .

Here, when aligning the circumferential position of the first concave portion 212a and the second convex portion 213b and the circumferential position of the first convex portion 213a and the second concave portion 212b, the shapes and widths may not completely match each other.

For example, the width of the first concave portion 212a may be larger than the width of the second convex portion 213b, and the width of the second concave portion 212b may also be larger than the width of the first convex portion 213a. In this way, the widths of the first concave portion 212a and the second concave portion 212b that are in non-contact with the shaft 30 are formed to be larger than the widths of the second convex portion 213b and the first convex portion 213a that are in contact with the shaft 30, respectively. It is further prevented that the first convex portion 213a and the second convex portion 213b overlap and cause frictional heat fusion on the outer peripheral surface of the shaft 30 due to dimensional errors during processing or assembly tolerances that occur when assembling the rotor core 21. Furthermore, even if the width of the first concave portion 212a and the width of the second concave portion 212b that are in non-contact with the shaft 30 are formed to be larger than the width of the second convex portion 213b and the width of the first convex portion 213a that are in contact with the shaft 30, respectively If it is a degree that the first convex portion 213a and the second convex portion 213b partially overlap, there is still an effect of preventing frictional heat fusion on the outer peripheral surface of the shaft 30.

Next, an example of the circumferential position of the first positioning hole 214a and the second positioning hole 214b of the first rotor core portion 21a and the second rotor core portion 21b will be described. Fig. 4 is a cross-sectional view showing the schematic configuration of the rotor core portion of the rotating electric machine according to the first embodiment. 4th Figure (A) shows a cross-sectional view of the first rotor core part, and Figure 4 (B) shows a cross-sectional view of the second rotor core part.

The first rotor core portion 21a and the second rotor core portion 21b are formed in the outer shape, the shape of the first through hole 211a and the second through hole 211b, except for the circumferential positions of the first positioning hole 214a and the second positioning hole 214b Are equal to each other. That is, the width and number of the first concave portion 212a and the first convex portion 213a of the first rotor core portion 21a are formed to be equal to the width and number of the second concave portion 212b and the second convex portion 213b of the second rotor core portion 21b .

In addition, the first concave portion 212a and the first convex portion 213a are formed at equal intervals, for example, in an even number. Similarly, the second concave portion 212b and the second convex portion 213b are formed at equal intervals, for example, each having an even number. Here, Figure 4 shows an example in which the first concave portion 212a and the first convex portion 213a, and the second concave portion 212b and the second convex portion 213b are formed respectively, but there may be two or more. .

As shown in FIG. 4(A), two first positioning holes 214a of the first rotor core portion 21a are provided at positions facing each other across the rotation center O. The center of each of the two first positioning holes 214a is set on a straight line P, for example, the straight line P is a straight line passing from the rotation center O through the first concave portion 212a and the counterclockwise adjacent first convex portion 213a. When the first positioning hole 214a is provided in this way, the first concave portion 212a and the first convex portion 213a are arranged to be inverted with respect to the straight line P. Here, the rotation center O refers to the shaft center of the shaft 30 or the shaft center of the rotor 20 coaxial with the shaft 30.

Similarly, as shown in FIG. 4(B), two second positioning holes 214b of the second rotor core portion 21b are provided at positions facing each other across the rotation center O. The respective centers of the two second positioning holes 214b are set on a straight line P, which passes through the rotation center O, for example A straight line between the second concave portion 212b and the second convex portion 213b adjacent in the counterclockwise direction. When the second positioning hole 214b is provided in this way, the second concave portion 212b and the second convex portion 213b are arranged to be inverted with respect to the straight line P.

When viewed from the axial direction of the shaft 30, the first rotor core portion 21a and the second rotor core portion 21b are aligned with respect to the first and second positioning holes 214a and 214b when the straight line P is aligned The straight lines P are arranged to be line-symmetric to each other. That is, the first concave portion 212a of the first rotor core portion 21a and the second concave portion 212b of the second rotor core portion 21b are located symmetrically with respect to the straight line P, and the first convex portion 213a of the first rotor core portion 21a and the second concave portion 212b The second convex portion 213b of the second rotor core portion 21b is located at a symmetrical position with respect to the straight line P.

When the first positioning hole 214a and the second positioning hole 214b are arranged in this way, one of the first rotor core portion 21a and the second rotor core portion 21b is turned over to have the same shape as the other. Therefore, the first rotor core portion 21a and the second rotor core portion 21b can be manufactured using the same mold as described in the following manufacturing method.

As described above, in the rotating electrical machine 100 of the first embodiment, the first rotor core portion 21a and the second rotor core portion 21b are such that the circumferential positions of the first concave portion 212a and the second convex portion 213b and the first convex portion 213a and the second convex portion 213b The circumferential positions of the recesses 212b are aligned and arranged side by side in the axial direction. Thereby, when the shaft 30 is press-fitted into the rotor core 21, the contact surface of the shaft 30 with the rotor core 21 is different along the axial direction. Thereby, it is possible to reduce the drag friction between the outer peripheral surface of the shaft 30 and the inner peripheral surface of the rotor core 21 due to contact and drag friction, resulting in deterioration of surface roughness and frictional thermal melting. Therefore, it is possible to suppress bending of the shaft 30 due to an increase in the pressing load caused by frictional heat fusion.

Next, the manufacturing method of the rotating electric machine 100 will be described. Fig. 5 is a flowchart showing the manufacturing process of the rotating electric machine according to the first embodiment.

First, a plurality of pieces of the first core piece 210a and the second core piece 210b constituting the first rotor core portion 21a and the second rotor core portion 21b are respectively formed (core piece forming step ST101). The first iron core piece 210a and the second iron core piece 210b are magnetic thin plates, for example, formed by punching SPCC (Steel Plate Cold Commercial) iron plates or silicon steel plates by stamping or laser processing Predetermined shape. The shapes of the first core piece 210a and the second core piece 210b are the same as the cross-sectional shapes of the first rotor core portion 21a and the second rotor core portion 21b shown in FIGS. 4(A) and 4(B).

The first core piece 210a has a first through hole 211a at the center in the radial direction, and the first through hole 211a is formed by punching out so that the inner peripheral surface is alternately provided with first concave portions 212a and first convex portions along the circumferential direction 213a. The second core piece 210b has a second through hole 211b at the center in the radial direction, and the second through hole 211b is formed by punching out so that second concave portions 212b and second convex portions are alternately provided on the inner peripheral surface along the circumferential direction 213b.

The first core piece 210a and the second core piece 210b are formed to connect the inner diameter of the circle formed by connecting the radially inner front ends of the plurality of first protrusions 213a provided in the circumferential direction, and the inner diameter of the circle connecting the second protrusions 213b. The inner diameters of the circles formed by the front ends on the inner side in the radial direction are each smaller than the outer diameter of the shaft 30 by the tightening amount (with respect to the radius of about 0.01 mm to 0.2 mm). And the inner diameter of the circle formed by connecting the radially inner front ends of the first recess 212a and the inner diameter of the circle formed by connecting the radially inner front ends of the second recess 212b are relative to each other. The radius is only larger than the outer diameter of the shaft 30 by about 0.03mm to 1mm.

The first iron core piece 210a and the second iron core piece 210b are formed by punching out to have a first positioning hole 214a and a second positioning hole at two locations away from the circumferential direction in the plane, respectively 214b. The first core piece 210a and the second core piece 210b are formed in the outer shape, the shape of the first through hole 211a and the second through hole 211b, except for the circumferential positions of the first positioning hole 214a and the second positioning hole 214b, and The thicknesses are equal to each other.

The first positioning hole 214a is formed on a straight line P, and the straight line P is, for example, a straight line from the rotation center O through the first concave portion 212a and the first convex portion 213a adjacent to the counterclockwise direction. In addition, the second positioning hole 214b is formed on a straight line P. The straight line P is, for example, a straight line from the rotation center O through the second concave portion 212b and the second convex portion 213b adjacent in the counterclockwise direction. When the first positioning hole 214a and the second positioning hole 214b are formed in this way, one of the first iron core piece 210a and the second iron core piece 210b is turned over to have the same shape as the other. Therefore, the first core piece 210a and the second core piece 210b can be formed using the same mold.

Next, a plurality of first core pieces 210a and second core pieces 210b are respectively laminated in the thickness direction to form the first rotor core portion 21a and the second rotor core portion 21b (rotor core portion forming step ST102). The plurality of first core pieces 210a are aligned with the circumferential position of the first positioning hole 214a to be laminated to form a first concave portion 212a and a first convex portion 213a connected in the axial direction, respectively. Similarly, the second core piece 210b is laminated by aligning the circumferential position of the second positioning hole 214b to form a second concave portion 212b and a second convex portion 213b that are connected in the axial direction, respectively. The laminated first iron core piece 210a and the second iron core piece 210b can be fixed between the respective laminated layers by riveting, laser welding, adhesion, etc.

Next, the first rotor core portion 21a and the second rotor core portion 21b are respectively fixed to the press-fit fixing jig 50, and the shaft 30 is press-fitted (shaft press-fitting step ST103). Fig. 6 is an explanatory diagram for explaining the manufacturing method of the rotating electric machine according to the first embodiment. As shown in Figure 6, the press-fit fixing jig 50 is provided with a hole for the shaft 30 to be inserted, and has the same size as the first rotor core 21a. Two pins 51 corresponding to the first positioning holes 214a. In addition, the press-fit fixing jig 50 is supported to the vicinity of the radially inner front end of the first convex portion 213a of the first rotor core portion 21a and the second convex portion 213b of the second rotor core portion 21b. The fixing jig 50 bears the pressing load together with the laminated core pieces, and can suppress the deformation toward the outside of the plane.

In the first rotor core portion 21a, the two pins 51 of the press-fit fixing jig 50 are respectively inserted into the two first positioning holes 214a to fix the circumferential position. Then, the shaft 30 is press-fitted into the first through hole 211a of the first rotor core portion 21a whose position is fixed. After the press-in, the first rotor core portion 21a and the shaft 30 are removed from the press-in fixing jig 50 together.

Furthermore, as shown in Fig. 7, when the shaft 30 is press-fitted into the first rotor core portion 21a, the portion 31a of the outer peripheral surface of the shaft 30 that is in contact with the first convex portion 213a of the first rotor core portion 21a is due to The surface becomes rough by dragging and friction when contacting the first rotor core portion 21a. On the other hand, in the outer peripheral surface of the shaft 30, the portion 31b that passes through without contacting the first concave portion 212a of the first rotor core portion 21a does not become rough, and maintains the first rotor core portion 21a before being pressed status.

Similar to the first rotor core portion 21a, the second rotor core portion 21b has two pins 51 provided in the press-fit fixing jig 50 inserted into the two second positioning holes 214b to fix the circumferential position. Then, the shaft 30 press-fitted into the first rotor core portion 21a is press-fitted into the second through hole 211b of the second rotor core portion 21b whose position is fixed.

The shaft 30 is set so that the second concave portion 212b of the second rotor core portion 21b does not contact but passes through the portion 31a that has contacted the first convex portion 213a of the first rotor core portion 21a, and makes the second convex portion of the second rotor core portion 21b The portion 213b is in contact with and passes through the portion 31b that passes through without contact with the first concave portion 212a of the first rotor core portion 21a, and is press-fitted. At this time, control axis 30 The axial position is such that one end surface of the first rotor core portion 21a and one end surface of the second rotor core portion 21b are in close contact with each other.

In this way, by separately press-fitting the first rotor core portion 21a and the second rotor core portion 21b and the shaft 30, the press-fitting length of simultaneous press-fitting can be shortened, the press-fitting load can be reduced, and the shaft 30 can be suppressed from bending during press-fitting.

Next, as shown in Fig. 5, magnets 22, which are alternately magnetized into N poles and S poles in the circumferential direction, are mounted on the outer peripheral surfaces of the first rotor core portion 21a and the second rotor core portion 21b by an adhesive to form the rotor 20 (Magnet adhesion step ST104).

Finally, the stator 10 is assembled on the radially outer side of the rotor 20 and the shaft 30 (stator assembly step ST105). In this way, the rotating electric machine 100 is manufactured. Here, steps ST101 to ST105 can also be omitted or alternate parts of the sequence, for example, the installation of the magnet 22 (step ST104) can also be performed before the pressing of the shaft 30 (step ST103). In addition, the fixing between the laminated layers of the first iron core piece 210a and the second iron core piece 210b may also be performed after the shaft 30 is pressed in.

Furthermore, it is illustrated here that the shaft 30 is pressed into the second rotor core portion 21b after the shaft 30 is pressed into the first rotor core portion 21a, but the first rotor core portion 21a and the second rotor core portion 21b The parts 21b are arranged side by side in the axial direction in the press-fit fixture 50, and the shaft 30 is press-fitted again at once.

According to this manufacturing method, by simple steps, the circumferential positions of the first concave portion 212a and the second convex portion 213b and the circumferential positions of the first convex portion 213a and the second concave portion 212b can be aligned, respectively, along the axis The first rotor core portion 21a and the second rotor core portion 21b are arranged side by side. Thereby, in the step of press-fitting the shaft 30, the occurrence of frictional heat fusion on the outer peripheral surface of the shaft 30 can be reduced, and the bending of the shaft 30 due to an increase in the press-fitting load can be suppressed. Therefore, it can be reduced to make the shaft 30 The machining accuracy of the outer diameter and the inner diameter of the rotor core 21 increase the manufacturing cost and increase the productivity.

In addition, since the first core piece 210a and the second core piece 210b are formed to have the same shape as the other when one is turned upside down, and can be manufactured using the same mold, the cost of the mold can be reduced. Improve productivity.

Furthermore, since the rotor core in which a plurality of core pieces are laminated is press-fitted, the press-fitting load is received by the plurality of core pieces, so that deformation of the core pieces toward the outside of the plane can be suppressed. Therefore, the reduction of the tightening torque between the shaft and the rotor core caused by the deformation of the core piece toward the outside of the plane can be prevented. In addition, since it is unnecessary to increase the steps for improving the machining accuracy of the outer diameter of the shaft 30 and the inner diameter of the rotor core 21, the manufacturing cost can be reduced, and the rotating electric machine 100 can be manufactured with high production.

In addition, when the shaft 30 is press-fitted into the first rotor core portion 21a, even if the first rotor core portion 21a is in contact with the shaft 30 at the axial end of the first convex portion 213a, burrs or the laminated first In the case of the deformation of the core piece 210a and the second core piece 210b toward the outside of the plane, the burrs or the deformed part toward the outside of the plane will be located in the second recess 212b of the second rotor core part 21b, so it can still be pressed in without any gap. The first rotor core portion 21a and the second rotor core portion 21b.

Furthermore, as an example of the first embodiment, it is illustrated that in the first rotor core portion 21a, the width of the first concave portion 212a is equal to the width of the first convex portion 213a, but for example, as shown in FIG. Within the range of the load of the clamping shaft 30, the width of the first convex portion 213a may be formed to be smaller than the width of the first concave portion 212a. At this time, the width of the second concave portion 212b of the second rotor core portion 21b is formed to be the same as that of the first convex portion 213a of the first rotor core portion 21a. The width is equal; the width of the second convex portion 213b of the second rotor core portion 21b is formed to be equal to the width of the first concave portion 212a of the first rotor core portion 21a.

Even with such a configuration, when viewed from the axial direction of the shaft 30, the circumferential positions of the first concave portion 212a and the second convex portion 213b and the circumferential positions of the first convex portion 213a and the second concave portion 212b can be aligned respectively And configuration.

In addition, as an example of the first embodiment, the first rotor core portion 21a and the second rotor core portion 21b are exemplified in such a way that one is turned over, that is, the other is the same shape, and the first positioning hole is provided 214a and the second positioning hole 214b, but the arrangement of the first positioning hole 214a and the second positioning hole 214b is not limited to this. For example, as shown in Figure 9(A), the first rotor core portion 21a may also be provided with two first positioning holes 214a on a straight line M passing through the center position of the first concave portion 212a opposed to the rotation center O, and as As shown in FIG. 9(B), the second rotor core portion 21b may be provided with two second positioning holes 214b on a straight line N passing through the center position of the second convex portion 213b opposed to each other with the rotation center O interposed therebetween. Here, the center position of the first recess 212a refers to a position where the length of the arc of one first recess 212a formed along the first through hole 211a becomes half. The same applies to the center position of the second convex portion 213b.

Even with such a configuration, when viewed from the axial direction of the shaft 30, by aligning the circumferential positions of the first positioning hole 214a and the second positioning hole 214b to make the straight line M and the straight line N coincide, the first concave portion 212a and the second The circumferential positions of the two convex portions 213b and the circumferential positions of the first convex portion 213a and the second concave portion 212b can be aligned and arranged respectively.

In addition, for an example of the first embodiment, two first positioning holes 214a and two second positioning holes 214b are respectively provided, but there may be two or more. For example, as shown in Figure 10, the first rotor core portion 21a and the second rotor core portion 21b may have four first stators, respectively. Position holes 214a and second positioning holes 214b. At this time, as shown in FIG. 10(A), the first positioning hole 214a is on a straight line M passing through the rotation center O to the center position of the first recess 212a, and two of the first positioning holes 214a are provided across the rotation center O. In addition, two are provided on the straight line N passing through the center position of the rotation center O and the first convex portion 213a across the rotation center O. The same is true for the second rotor core part, as shown in Fig. 10(B), with four second positioning holes 214b. The second positioning holes 214b are on a straight line M passing through the rotation center O to the center position of the second recess 212b On the top, two are provided across the rotation center O. In addition, two are provided on the straight line N passing through the center position of the rotation center O and the second convex portion 213b with the rotation center O interposed therebetween.

The first rotor core portion 21a and the second rotor core portion 21b are arranged side by side in the axial direction by aligning the straight line M of the first rotor core portion 21a with the straight line N of the second rotor core portion 21b. When the shaft 30 is pressed in Since the contact surface with the rotor core 21 is different along the axial direction, the shaft 30 can be easily pressed in. Moreover, since the four first positioning holes 214a and the second positioning holes 214b are respectively provided, the first rotor core portion 21a and the second rotor core portion 21b are rotationally symmetric with respect to the rotation center O, so the same mold can be used to Make.

[Embodiment 2]

The rotating electric machine 100 according to the second embodiment will be described. Hereinafter, the description of the same points as in the first embodiment is omitted, and the description is centered on the differences.

Fig. 11 is a cross-sectional view showing the schematic configuration of the rotor core of the rotating electric machine according to the second embodiment. Fig. 11(A) is a cross-sectional view of the first rotor core portion 21a, and Fig. 11(B) is a cross-sectional view of the second rotor core portion 21b.

As shown in FIG. 11(A), the first through hole 211a of the first rotor core portion 21a has, for example, three first concave portions 212a and first convex portions 213a, respectively, and the first concave portion 212a and the second The width of a single protrusion 213a is equal and alternately arranged at equal intervals. In addition, the first concave portions 212a and the first convex portions 213a are formed, for example, to have the same number and the same width. By forming in this way, when the first rotor core portion 21a is rotated by 180 degrees with respect to the rotation center O, the first concave portion 212a and the first convex portion 213a are arranged to be reversed to each other.

Two first positioning holes 214a are provided at positions opposite to each other across the rotation center O. The center of each of the two first positioning holes 214a is, for example, set on a straight line Q. This straight line Q is a straight line passing through the center position of the first concave portion 212a and the center position of the first convex portion 213a facing each other across the rotation center O. .

As shown in FIG. 11(B), the second through hole 211b of the second rotor core portion 21b has, for example, three second concave portions 212b and second convex portions 213b, respectively. The second concave portions 212b and the second convex portions 213b are The width of the single one is equal and alternately arranged at equal intervals. In addition, the second concave portions 212b and the second convex portions 213b are formed, for example, to have the same number and the same width. By forming in this way, when the second rotor core portion 21b is rotated by 180 degrees with respect to the rotation center O, the second concave portion 212b and the second convex portion 213b are arranged to be reversed to each other.

Two second positioning holes 214b are provided at positions opposite to each other across the rotation center O. The center of each of the two second positioning holes 214b is, for example, set on a straight line Q, which passes through the center position of the second concave portion 212b and the center position of the second convex portion 213b opposed to the center of rotation O. .

The first rotor core portion 21a and the second rotor core portion 21b have an outer shape, the first through hole 211a and the second through hole 211b have the same shape, one of the first rotor core portion 21a and the second rotor core portion 21b When the rotation center O is rotated by 180 degrees or when it is turned over, the shaft 30 has the same shape as the other when viewed from the axial direction of the shaft 30.

In addition, when the first rotor core portion 21a and the second rotor core portion 21b are aligned in the circumferential direction of the first positioning hole 214a and the second positioning hole 214b to make the straight line Q coincide, the first concave portion 212a and the second convex The circumferential position of the portion 213b is aligned, and the circumferential position of the first convex portion 213a and the second concave portion 212b are aligned.

Here, the first concave portion 212a and the first convex portion 213a, and the second concave portion 212b and the second convex portion 213b are respectively three, but if the first concave portion 212a and the first convex portion are arranged opposite to the rotation center O 213a, and the second concave portion 212b and the second convex portion 213b may be arranged opposite to the rotation center O of the second rotor core portion 21b, and it may be an odd number of three or more. In addition, it is illustrated that the first positioning hole 214a and the second positioning hole 214b are provided on a straight line Q passing through the center of the first concave portion 212a and the first convex portion 213a, and passing through the center of the second concave portion 212b and the second convex portion 213b. On the straight line Q of the position, it is only necessary to provide at least two positions at opposite positions across the rotation center O.

As described above, in the rotary electric machine 100 of the second embodiment, when the shaft 30 is pressed in, the contact surface of the shaft 30 with the rotor core 21 is different along the axial direction, so that friction and heat melting on the outer peripheral surface of the shaft 30 can be reduced. , And can restrain the shaft 30 from bending. Furthermore, in the present embodiment, when one of the first rotor core portion 21a and the second rotor core portion 21b is rotated 180 degrees with the rotation center O as the center or when it is turned over, it becomes the same shape as the other. Therefore, the first rotor core portion 21a and the second rotor core portion 21b can be manufactured with the same mold, which can further reduce manufacturing costs and improve productivity.

Next, a method of manufacturing the rotating electric machine 100 of the second embodiment will be described. Here, the description of the same parts as in the first embodiment is simplified or omitted. Fig. 12 is a flowchart showing the manufacturing process of the rotating electric machine of the second embodiment.

A plurality of first core pieces 210a and second core pieces 210b are formed (core piece forming step ST201). The first iron core piece 210a and the second iron core piece 210b use the same mold and are punched into a predetermined shape by stamping or laser processing. As shown in FIG. 11(A), when the first core piece 210a is rotated by 180 degrees with the rotation center O as the center, the first concave portion 212a and the first convex portion 213a are mutually inverted. Similarly, as shown in FIG. 11(B), when the second core piece 210b is rotated by 180 degrees with the rotation center O as the center, the second concave portion 212b and the second convex portion 213b are mutually inverted.

Next, a plurality of first core pieces 210a and second core pieces 210b are simultaneously laminated along the thickness direction to form the first rotor core portion 21a and the second rotor core portion 21b (rotor core portion forming step ST202). The first iron core piece 210a and the second iron core piece 210b are laminated at the same time without being distinguished from each other (core piece lamination step ST202a). The laminated layer is divided into two according to the predetermined layer thickness, one of which is used as the first rotor core portion 21a, and the other is rotated 180 degrees with respect to the first rotor core portion 21a with the rotation center O as the second rotor core. Section 21b (Laminated core piece rotation step ST202b).

The first rotor core portion 21a and the second rotor core portion 21b are fixed to the press-fit fixing jig 50, and the shaft 30 is press-fitted (shaft press-fitting step ST203). Fig. 13 is an explanatory diagram for explaining the manufacturing method of the rotating electric machine according to the second embodiment. The first rotor core portion 21a is arranged by inserting the pin 51 of the press-fitted fixing jig 50 through the first positioning hole 214a. Then, the second rotor core portion 21b is arranged such that the pin 51 of the press-fitted fixing jig 50 is inserted into the second positioning hole 214b and overlaps the first rotor core portion 21a in the axial direction. The shaft 30 is pressed into the first through hole 211a of the first rotor core portion 21a and the second through hole 211b of the second rotor core portion 21b at one time.

In this way, the first rotor core portion 21a and the second rotor core portion 21b are arranged side by side in the press-fit fixture 50 and the shaft 30 is press-fitted at once, thereby, compared to the case where the shaft 30 is press-fitted separately. Can improve productivity.

The magnet 22 is attached to the outer peripheral surfaces of the first rotor core portion 21a and the second rotor core portion 21b by an adhesive to form the rotor 20 (magnet bonding step ST204). The stator 10 is assembled on the radially outer side of the rotor 20 and the shaft 30 (stator assembly step ST205).

In this way, the rotating electric machine 100 is manufactured. Here, steps ST201 to ST205 may be omitted or alternate parts of the order. For example, it is illustrated that the first iron core piece 210a and the second iron core piece 210b are laminated and then one of them is rotated by 180 degrees. However, one of the first iron core piece 210a and the second iron core piece 210b may be rotated by 180 degrees before being laminated. In addition, the step of arranging the first rotor core portion 21a and the second rotor core portion 21b side by side in the axial direction and pressing the shaft 30 at one time is illustrated, but the first rotor core portion 21a and the second rotor core portion 21b are also Can be pressed in separately.

In addition, the second rotor core part 21b is illustrated as the second rotor core part 21b, which is rotated 180 degrees with respect to the first rotor core part 21a with the rotation center O as the center. However, the second rotor core part 21b may be turned over with respect to the first rotor core part 21a. The rotor core 21b.

As described above, in the manufacturing method of the rotating electric machine 100 of the second embodiment, the circumferential positions of the first concave portion 212a and the second convex portion 213b and the circumference of the first convex portion 213a and the second concave portion 212b can be adjusted by simple steps. The directions and positions are respectively aligned, which can reduce friction and heat melting on the outer peripheral surface of the shaft 30 and easily press the shaft 30 in. Furthermore, in the manufacturing method of the rotating electric machine 100 of this embodiment, the first core piece 210a and the second core piece 210b can be punched out with the same die, so the manufacturing cost of the die can be reduced. Also, if the first rotor core 21a and the The two rotor core parts 21b have the same layer thickness, and then a plurality of first rotor core parts 21a can be manufactured first, and the first rotor core parts 21a can be rotated 180 degrees or turned over with the rotation center O as the second rotor core part. 21b is used, so it can improve productivity.

[Embodiment 3]

Next, the rotating electric machine 100 of the third embodiment will be described. Hereinafter, the description of the same points as in the first embodiment is omitted, and the description is centered on the differences. In the first embodiment, it is exemplified that the first positioning hole 214a and the second positioning hole 214b are separated in the circumferential direction and have the same shape. However, in this embodiment, the shapes of the two holes are different.

Fig. 14 is a cross-sectional view showing the schematic configuration of the rotor core portion of the rotating electric machine according to the third embodiment. Figure 14(A) is a cross-sectional view of the first rotor core part, and Figure 14(B) is a cross-sectional view of the second rotor core part. As shown in FIG. 14, the first rotor core portion 21a has a first hole 2141a and a second hole 2142a having different sizes of diameters opposed to each other with the rotation center O interposed therebetween. Similarly, the second rotor core portion 21b has a first hole 2141b and a second hole 2142b having different diameters opposite to each other across the rotation center O. The first hole 2141a and the second hole 2142a of the first rotor core portion 21a constitute a first positioning hole, and the first hole 2141b and the second hole 2142b of the second rotor core portion 21b constitute a second positioning hole.

Figures 15 and 16 are explanatory diagrams for explaining the manufacturing method of the rotating electric machine according to the third embodiment. As shown in Fig. 15, when the shaft 30 is pressed in the first rotor core portion 21a, the first pin 51a and the second pin 52a of the corresponding press-fit fixing jig 50a are inserted through the first hole 2141a and the second pin. Two holes 2142a fix the circumferential position. Similarly, as shown in Figure 16, the second rotor core portion 21b is used to press in the shaft 30 so that the corresponding press-fit fixtures 50b The first pin 51b and the second pin 52b are inserted through the first hole 2141b and the second hole 2142b to fix their positions in the circumferential direction.

In this way, the first positioning hole 214a has a first hole 2141a and a second hole 2142a with different diameters across the rotation center O; the second positioning hole 214b has a size opposite to each other across the rotation center O The different first holes 2141b and second holes 2142b can be fixed to the press-fit fixtures 50a, 50b by distinguishing appropriate circumferential positions, which can improve workability and productivity.

Here, as shown in Figure 14(A), the radius of the first hole 2141a is set to r1, the radius of the second hole 2142a is set to r2, and the distance from the center of rotation O to the center of the first hole 2141a is set to R1, when the distance from the rotation center O to the center of the second hole 2142a is set to R2, the first hole 2141a and the second hole 2142a of the first rotor core portion 21a are preferably formed in a manner that satisfies the mathematical formula (1) .

Among them, r1≠r2, R1≠R2.

That is, the product of the square of the radius r1 of the first hole 2141a and the distance R1 from the center of the first hole 2141a to the center of rotation O is equal to the square of the radius r2 of the second hole 2142a and the center of the second hole 2142a to the center of rotation O The product of the distance R2. When the first hole 2141a and the second hole 2142a are formed in this way, the inconsistency in the mass distribution caused by the first hole 2141a and the second hole 2142a (hereinafter also referred to as unbalance) can be offset, and the rotor 20 can be prevented from rotating. Vibration or noise due to centrifugal force.

For example, when the layer thickness of the first rotor core portion 21a is set to H and the material density is set to ρ, the unbalance U1 generated by the first hole 2141a in the first rotor core portion 21a can be expressed by the formula (2) Said.

Similarly, the unbalance U2 generated by the second hole 2142a in the first rotor core portion 21a can be expressed by the mathematical formula (3).

By satisfying the mathematical formula (1), according to the mathematical formula (2) and the mathematical formula (3), U1=U2, which can offset the unbalance of the first hole 2141a and the second hole 2142a.

Similarly, when the first hole 2141b and the second hole 2142b of the second rotor core portion 21b are also formed in a manner that satisfies the relationship of the mathematical formula (1), the unbalance of the second rotor core portion 21b can be offset , When the rotor 20 rotates, it can prevent vibration or noise due to centrifugal force.

As described above, in the rotating electric machine 100 of the third embodiment, when the shaft 30 is pressed in, the contact surface of the shaft 30 with the rotor core 21 is different along the axial direction, so the generation of frictional heat on the outer peripheral surface of the shaft 30 can be reduced. Melt, and can suppress the shaft 30 from bending.

Furthermore, in the rotating electric machine 100 of the third embodiment, the two first positioning holes 214a of the first rotor core portion 21a have mutually different shapes, and the second rotor core portion 21b has the second positioning holes 214a. The two positioning holes 214b have different shapes. Thereby, when the shaft 30 is pressed in, the first hole 2141a and the second hole 2142a of the first rotor core portion 21a can be easily distinguished corresponding to the first pin 51a and the second pin 52b of the press-fit fixture 50a. What. Similarly, it can be easily distinguished whether the first hole 2141b and the second hole 2142b of the second rotor core part 21b correspond to the first pin 51b and the second pin 52b of the press-fit fixture 50b, respectively. Thereby, the first rotor core portion 21a and the second rotor core portion 21b can be easily arranged at appropriate circumferential positions, and the workability can be improved and the productivity can be improved.

Furthermore, in the rotating electric machine 100 of the third embodiment, the first positioning hole 214a and the second positioning hole 214b each have two holes, the square of the radius of one of the two holes and the center of the other The product of the distance from the center is equal to the product of the square of the radius of the other hole and the distance from the center of the other hole to the center of rotation, thereby preventing the centrifugal force from generating vibration or noise due to unbalance when the rotor 20 rotates , Can provide high-quality rotating electric machine 100.

Furthermore, in Embodiment 3, it is illustrated that the two holes of the first positioning hole 214a and the second positioning hole 214b respectively have circular shapes and different diameters. However, if the shape of the two holes is distinguishable The degree of mutual difference may be sufficient. For example, one of the two holes may be circular and the other hole may be a regular square.

[Embodiment 4]

The rotating electric machine 100 according to the fourth embodiment will be described. Hereinafter, the description of the same points as in the first embodiment is omitted, and the description is centered on the differences. In the first embodiment, the first through hole 211a and the second through hole 211b have corner shapes, but in this embodiment, they have a continuous curved surface.

Fig. 17 is a cross-sectional view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the fourth embodiment. Figure 17 (A) is a cross-sectional view of the first rotor core and shaft, and Figure 17 (B) is a cross-sectional view of the second rotor core and shaft. As shown in FIG. 17, in the first rotor core portion 21a, the inner peripheral surface of the first through hole 211a forming the first concave portion 212a and the first convex portion 213a is formed as a continuous curved surface. Similarly, in the second rotor core portion 21b, the inner peripheral surface of the second through hole 211b forming the second concave portion 212b and the second convex portion 213b is formed as a continuous curved surface.

When viewed from the axial direction of the shaft 30, the first rotor core portion 21a and the second rotor core portion 21b align the circumferential positions of the first concave portion 212a and the second convex portion 213b, and the first convex portion 213a and the second convex portion 213a The two concave portions 212b are aligned in the circumferential direction and arranged side by side in the axial direction.

As described above, in the rotary electric machine 100 of the fourth embodiment, when the shaft 30 is pressed in, the contact surface of the shaft 30 with the rotor core 21 is different along the axial direction, so the generation of frictional heat on the outer peripheral surface of the shaft 30 can be reduced. Melt, and can suppress the shaft 30 from bending.

Furthermore, in the fourth embodiment, by forming the inner peripheral surfaces of the first through hole 211a of the first rotor core portion 21a and the second through hole 211b of the second rotor core portion 21b with continuous curved surfaces, the shaft can be prevented from being The stress generated during press-fitting is concentrated at the corners, and the deformation of the first core piece 210a and the second core piece 210b forming the first rotor core portion 21a and the second rotor core portion 21b toward the outside of the plane can be suppressed.

[Embodiment 5]

The rotating electric machine 100 according to the fifth embodiment will be described. Hereinafter, the description of the same points as in the first embodiment is omitted, and the description is centered on the differences. In the first embodiment, the structure in which two rotor cores of the first rotor core portion 21a and the second rotor core portion 21b are pressed into the shaft 30 is illustrated. However, the first rotor core portion 21a and the second rotor core portion may be 21b and the third rotor core A structure in which three or more rotor cores of 21c are pressed into the shaft 30. Hereinafter, the structure in which the three rotor cores are press-fitted into the shaft 30 will be described.

Fig. 18 is a side view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the fifth embodiment.

Fig. 19 is a cross-sectional view showing the schematic configuration of the rotor and shaft of the rotating electric machine according to the fifth embodiment. Figure 19(A) is a cross-sectional view of the first rotor core and shaft along the line A-A' in Figure 18, and Figure 19(B) is the second section along the line B-B' in Figure 18 The cross-sectional view of the rotor core and the shaft. Figure 19(C) is a cross-sectional view of the third rotor core and the shaft along the line CC' in Figure 18.

As shown in Figure 19(A), in the first through hole 211a of the first rotor core portion 21a, the total of the first convex portions 213a occupies one third of the circumference, that is, about 120°, the first concave portion 212a The sum occupies two-thirds of the circumference, which is about 240°. For example, there are three first convex portions 213a and three first concave portions 212a each, and when the respective widths of the three first convex portions 213a are equal and the respective widths of the three first concave portions 212a are equal, the first convex portion 213a The width of a single one becomes 40°, and the width of a single first recess 212a becomes 80°.

Similarly, as shown in Figure 19(B), the width of a single second convex portion 213b formed in the second through hole 211b of the second rotor core portion 21b is 40°, and a single second concave portion 212b The width becomes 80°. Furthermore, as shown in Figure 19(C), the width of a single third convex portion 213c formed in the third through hole 211c of the third rotor core portion 21c is 40°, and a single third concave portion 212c The width becomes 80°.

Furthermore, the circumferential positions of the first convex portion 213a, the second concave portion 212b, and the third concave portion 212c, and the circumferential position of the second convex portion 213b, the first concave portion 212a and the third concave portion 212c The shaft 30 is press-fitted in such a manner that the positions and the circumferential positions of the third convex portion 213c, the first concave portion 212a, and the second concave portion 212b can be respectively aligned.

That is, when viewed from the axial end of the shaft, only the first convex portion 213a is the first convex portion 213a in the circumferential range where the circumferential range of the first convex portion 213a overlaps the circumferential range of the second concave portion 212b and the third concave portion 212c It is in surface contact with the shaft 30 including the contact surface of the shaft 30 in contact with the first convex portion 213a. When viewed from the axial end of the shaft 30, in the circumferential range where the circumferential range of the second convex portion 213b overlaps the circumferential range of the third concave portion 212c and the first concave portion 212a, only the second convex portion 213b includes The surface contact of the shaft 30 which is in contact with the contact surface of the shaft 30 of the second convex portion 213b. When viewed from the axial end of the shaft 30, in the circumferential range where the circumferential range of the third convex portion 213c overlaps the circumferential range of the first concave portion 212a and the second concave portion 212b, only the third convex portion 213c includes The surface contact of the shaft 30 which is in contact with the contact surface of the shaft 30 of the third convex portion 213c.

As described above, in the rotating electric machine 100 of the fifth embodiment, even if the rotor core is long in the axial direction, when the shaft 30 is pressed in, the contact surface of the shaft 30 with the rotor core 21 is different along the axial direction, so it can be The occurrence of frictional heat fusion on the outer peripheral surface of the shaft 30 is reduced, and bending of the shaft 30 can be suppressed.

Furthermore, in Embodiments 1 to 5, the first rotor core portion 21a, the second rotor core portion 21b, and the third rotor core portion 21c are exemplified as having a first positioning hole 214a and a second positioning hole 214a penetrating in the axial direction in a plane. The positioning hole 214b and the third positioning hole 214c can only be provided with a first positioning portion, a second positioning portion and a third positioning portion for determining the circumferential position, and the first positioning portion, the second positioning portion and the third positioning portion The positioning portion may be, for example, a groove provided on the outer peripheral surface of the first rotor core portion 21a, the second rotor core portion 21b, and the third rotor core portion 21c by cutting or the like.

In addition, in Embodiments 1 to 5, the first rotor core portion 21a, the second rotor core portion 21b, and the third rotor core portion 21c are arranged in close contact with each other, but in order to reduce the cogging torque, they may have The stage deflection structure of the gap.

In addition, in Embodiments 1 to 5, the rotor core 21 is illustrated as having a substantially polygonal column shape, but it may be substantially cylindrical. The term “substantially polygonal column” here includes a column in which the corners of a polygon are curved. In addition, the term "substantially cylindrical" includes not only a cylinder whose cross-sectional shape is a perfect circle in a plane perpendicular to the axial direction, but also a cylinder whose cross-sectional shape is an ellipse.

Furthermore, in Embodiments 1 to 5, the rotating electric machine 100 with a surface magnet type (SPM: Surface Permanent Magnet) structure has been described, but it can also be adapted to a built-in magnet type (IPM: Interior Permanent Magnet; Built-in permanent magnet) structure of rotating electric machine 100.

In addition, in Embodiments 1 to 5, a plurality of magnets 22 that are alternately magnetized to N poles and S poles in the circumferential direction are used, but it may be a ring-shaped magnet 22 that is alternately magnetized to N poles and S poles in the circumferential direction.

In addition, in Embodiments 1 to 5, the rotating electric machine 100 is illustrated as a motor, but it may be a generator.

Various exemplified embodiments and examples are recorded in this case. The various features, aspects, and functions described in only one or a plurality of embodiments are not limited to the application of a specific embodiment, but can be applied to implementation alone or in various combinations form.

Accordingly, countless modified examples that are not illustrated are also deemed to be included in the technical scope disclosed in this specification. For example, modifications, additions, or omissions of at least one component are also included. Furthermore, at least one component is extracted and combined with Combination of components of other embodiments.

21a: The first rotor core

21b: The second rotor core

30: axis

211a: first through hole

211b: second through hole

212a: The first recess

212b: second recess

213a: the first convex part

213b: second convex part

214a: The first positioning hole

214b: second positioning hole

Claims (15)

A rotating electric machine is provided with: a shaft; a rotor having a first rotor core portion and a second rotor core portion, the first rotor core portion is formed by stacking a plurality of first core pieces consecutively along the axial direction of the shaft The inner peripheral surface of the first through hole pressed into the shaft in the radial center portion of the first core piece is alternately formed with first convex portions contacting the shaft and not contacting the shaft in the circumferential direction. The first recessed portion of the shaft contact; the second rotor core portion is formed by stacking a plurality of second core pieces connected in the axial direction of the shaft, and the radial center portion of the second core piece is pressed into the aforementioned The inner peripheral surface of the second through hole of the shaft is alternately formed with second convex portions contacting the shaft and second concave portions not contacting the shaft along the circumferential direction; the first rotor core portion and the second rotor The core portion is arranged side by side in the axial direction by aligning the circumferential positions of the first concave portion and the second convex portion and the circumferential positions of the first convex portion and the second concave portion, and is arranged along the first The rotor core portion and the second rotor core portion are provided with magnets in the circumferential direction; and the stator is arranged on the radially outer side of the rotor; the first rotor core portion has the positioning first concave portion and the first convex The first positioning portion in the circumferential direction of the portion; the second rotor core portion has a second positioning portion for positioning the circumferential positions of the second concave portion and the second convex portion; the first rotor core portion and the second The rotor core part is arranged side by side in the axial direction by aligning the circumferential positions of the first positioning part and the second positioning part. A rotating electric machine, which is equipped with: shaft; The rotor has a first rotor core portion and a second rotor core portion. The first rotor core portion is formed by stacking a plurality of first core pieces connected in the axial direction of the shaft. The inner peripheral surface of the first through hole pressed into the shaft in the radial center portion is alternately formed with first convex portions in contact with the shaft and first concave portions not in contact with the shaft in the circumferential direction; The second rotor core part is composed of a plurality of second core pieces laminated in the axial direction of the shaft, and the inner circumference of the second through hole of the shaft is pressed into the radial center of the second core piece The surface is alternately formed with second convex portions in contact with the shaft and second concave portions not in contact with the shaft along the circumferential direction; the first rotor core portion and the second rotor core portion are respectively formed with the first concave portions Align with the circumferential position of the second convex portion and the circumferential position of the first convex portion and the second concave portion, and are arranged side by side along the axial direction, and along the first rotor core portion and the second rotor core A magnet is provided in the circumferential direction of the part; and a stator is arranged on the radially outer side of the rotor; the first rotor core part has a circumferential position for positioning the first concave part and the first convex part and is along the A first positioning hole penetrating in the axial direction; the second rotor core portion has a second positioning hole penetrating along the axial direction for positioning the circumferential positions of the second concave portion and the second convex portion; the first rotor core Part and the second rotor core part are aligned in the circumferential direction of the first positioning hole and the second positioning hole and arranged side by side in the axial direction; the first concave part and the first convex part are respectively arranged in the circumferential direction Three or more odd numbers are formed at equal intervals; the first positioning hole is located at a position opposed to the rotation center of the rotor; the second concave portion and the second convex portion of the second rotor core portion are respectively along Three or more odd numbers are formed at equal intervals in the circumferential direction; the second positioning hole is located across the rotation Center and opposite position; the first rotor core portion and the second rotor core portion are arranged to be 180 degrees rotationally symmetrical with respect to the rotation center. The rotating electric machine described in claim 1 or 2, wherein, when viewed from the axial end of the shaft, the circumferential range of the second convex portion overlaps the circumferential range of the first concave portion In the range, only the second convex portion is in contact with the surface of the shaft including the contact surface of the shaft in contact with the second convex portion; when viewed from the axial end, the circumferential range of the first convex portion In the circumferential range overlapping with the circumferential range of the second concave portion, only the first convex portion is in contact with the surface of the shaft including the contact surface of the shaft that contacts the first convex portion. The rotating electric machine described in claim 1 or 2, wherein the first concave portion and the first convex portion are formed at equal intervals along the circumferential direction, respectively, and the second concave portion and the second convex portion The lines are formed at equal intervals along the circumferential direction. The rotating electric machine described in claim 1, wherein the first concave portion and the first convex portion are in a mutually inverted arrangement with respect to a straight line passing through the rotation center of the first positioning portion and the shaft, The second concave portion and the second convex portion are arranged in reverse to each other with respect to a straight line passing through the rotation center of the second positioning portion and the shaft. According to the rotating electric machine described in claim 1, wherein the first positioning portion and the second positioning portion are first positioning holes and second positioning holes penetrating in the axial direction, respectively. The rotating electric machine described in the scope of the patent application, wherein the first positioning hole is located at a position opposite to the rotation center of the rotor; The first rotor core portion has the first positioning hole on a straight line passing through the rotation center and the center position of the first recess in the circumferential direction; the second positioning hole is located at a position opposite to the rotation center; The second rotor core portion has the second positioning hole on a straight line passing through the center of rotation and the center position of the second convex portion in the circumferential direction. The rotating electric machine described in claim 7, wherein the first rotor core portion further has the first positioning hole on a straight line passing through the center of rotation and the center position of the first convex portion in the circumferential direction; The second rotor core portion further has the second positioning hole on a straight line passing through the rotation center and the center position of the second recess in the circumferential direction. According to the rotating electric machine described in claim 2, wherein the first positioning hole and the second positioning hole are at positions facing each other across the rotation center of the rotor, and each has two holes with different shapes. The rotating electric machine described in the scope of patent application 2, wherein the product of the square of the radius of one of the two holes and the distance from the center of the one hole to the center of rotation is equal to that of the other The product of the square of the radius of the hole and the distance from the center of the other hole to the center of rotation. The rotating electric machine according to any one of the claims 1, 2, 5 to 10, wherein the inner peripheral surface of the first through hole of the first rotor core portion and the inner peripheral surface of the second rotor core portion The inner peripheral surfaces of the second through holes respectively have continuous curved surfaces. A manufacturing method of a rotating electric machine, which has: The core piece forming step is to punch out the first through holes in the radial center portion of the first core pieces of the plurality of pieces so that the inner peripheral surface is alternately provided with first concave portions and first convex portions along the circumferential direction The second through hole in the radial center of the plurality of second core pieces is punched out so that the second concave portion and the second convex portion are alternately provided along the circumferential direction on the inner peripheral surface The step of forming a rotor core part is a step of laminating a plurality of pieces of the first core piece in a manner that the first concave portion and the first convex portion are respectively connected in the axial direction to form a first rotor core portion, and the plurality of pieces of the first core piece The two core pieces are laminated to form a second rotor core part in such a way that the second concave part and the second convex part are respectively connected in the axial direction; the shaft pressing step is based on the circumferential position of the first concave part and the second convex part And the circumferential positions of the first convex portion and the second concave portion are respectively aligned, and the shaft is pressed into the first through hole and the second through hole; the magnet bonding step is along the first rotor core Magnets are adhered to the circumferential direction of the second rotor core portion and the second rotor core portion; and the stator assembly step is to assemble the stator to the radially outer side relative to the first rotor core portion and the second rotor core portion; the core piece forming step , A first positioning hole is formed in the first iron core piece and a second positioning hole is formed in the second iron core piece; in the shaft pressing step, the pin that is pressed into the fixing jig extending in the axial direction is inserted through the first A positioning hole and the second positioning hole are used for positioning the first rotor core portion and the second rotor core portion, and pressing the shaft. The method of manufacturing a rotating electric machine described in the scope of patent application, wherein, in the shaft pressing step, the first rotor core portion and the second rotor core portion are arranged side by side Place the pin of the press-fit fixture, and press the shaft into the first through hole of the first rotor core part and the second through hole of the second rotor core part at one time. The method of manufacturing a rotating electrical machine described in the scope of the application for patent 12 or 13, wherein in the core piece forming step, the first core piece is turned over to become the second core piece to form the first core piece. The convex portion, the first concave portion, the second convex portion, and the second concave portion. According to the manufacturing method of the rotating electric machine described in the 12th or 13th item of the scope of patent application, in the iron core piece forming step, the first iron core piece is rotated 180 degrees to form the second iron core piece. A convex portion, the first concave portion, the second convex portion, and the second concave portion.

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