CN110036552B

CN110036552B - Stator core component piece and rotating electrical machine

Info

Publication number: CN110036552B
Application number: CN201780074495.4A
Authority: CN
Inventors: 中村雄一朗; 内村智也; 山口信一; 长谷川治之
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2017-04-05
Filing date: 2017-04-05
Publication date: 2020-09-22
Anticipated expiration: 2037-04-05
Also published as: KR102077593B1; CN110036552A; WO2018185879A1; KR20190064662A; JP6309178B1; TW201838290A; TWI672891B; JPWO2018185879A1

Abstract

A plurality of stator core constituting pieces (11a) constituting an annular stator core, characterized in that the stator core constituting pieces are composed of a back yoke (11a1) and teeth (11a2) provided on the inner peripheral side of the back yoke (11a1), the teeth (11a2) have a base portion (11a22) extending in the central axis direction from the circumferential center of the back yoke (11a1) and a tip portion (11a21) provided on the inner peripheral side of the base portion (11a22), the teeth (11a2) form a groove (3) having a shape in which the width in the circumferential direction changes stepwise toward the outer side in the radial direction of the stator core on the inner peripheral portion of the tip portion (11a21), the 2 nd width is narrower than the 1 st width when the width in the radial direction from the 1 st intersection point (IP1) to the 2 nd intersection point (IP2) is set as the 2 nd width, and the 2 nd width in the radial direction from the 1 st intersection point (IP1) to the 3 rd intersection point (IP3) is set as the 2 nd width.

Description

Stator core component piece and rotating electrical machine

Technical Field

The present invention relates to a stator core constituting sheet and a rotating electrical machine, each of which is composed of a back yoke and a plurality of teeth provided on an inner peripheral side of the back yoke.

Background

The stator core of the rotating electric machine disclosed in patent document 1 includes a yoke and a plurality of teeth provided in the yoke, and a notch that opens toward the center of the stator core is formed radially inward of the teeth in order to reduce vibration caused by torque ripple. The width of the notch in the radial direction of the rotating electric machine is wider than the width of the notch in the circumferential direction of the center shaft of the rotating electric machine.

Patent document 1: japanese patent No. 4114372

Disclosure of Invention

However, the stator core disclosed in patent document 1 has a problem that only one of the cogging torque generated by the combination of the number of magnetic poles and the number of slots and the cogging torque generated by the fluctuation of the magnetic force of the magnet can be reduced.

The present invention has been made in view of the above circumstances, and an object thereof is to obtain a stator-core constituent sheet capable of reducing both cogging torque generated by a combination of the number of magnetic poles and the number of slots and cogging torque generated by fluctuation of magnetic force of magnets.

In order to solve the above-described problems and achieve the object, a stator core constituting sheet of the present invention is a stator core constituting sheet in which a ring-shaped stator core is constituted by a plurality of stator core constituting sheets, the stator core constituting sheet being characterized in that the stator core constituting sheet is constituted by a back yoke and teeth provided on an inner peripheral side of the back yoke, the teeth have a base portion extending in a central axis direction from a circumferential center of the back yoke and a tip portion provided on the inner peripheral side of the base portion, a groove having a shape in which a width in a circumferential direction changes stepwise toward an outer side in a radial direction of the stator core is formed on an inner peripheral portion of the tip portion, a width in a radial direction from a virtual curve extending from an inner peripheral surface of the tip portion to the groove and a1 st intersection point of bisectors bisecting the tip portion in the circumferential direction, to a2 nd intersection point of a boundary between the base portion and the tip portion and the bisectors is set to a1 st width in a cross section perpendicular to the central axis, when the width in the radial direction from the 1 st intersection point to the 3 rd intersection point of the bottom surface of the groove and the bisector is defined as the 2 nd width, the 2 nd width is narrower than the 1 st width.

ADVANTAGEOUS EFFECTS OF INVENTION

The stator core component piece according to the present invention has an effect that both cogging torque generated by a combination of the number of magnetic poles and the number of slots and cogging torque generated by fluctuation of magnetic force of the magnet can be reduced.

Drawings

Fig. 1 is a cross-sectional view in a direction perpendicular to the axial direction of the central shaft of a rotating electric machine having a stator core according to embodiment 1.

Fig. 2 is an oblique view of the stator core constituent sheet shown in fig. 1.

Fig. 3 is a view of the stator core constituting sheet shown in fig. 1 as viewed from an end surface side of the stator core in the axial direction of the central shaft of the rotary electric machine.

Fig. 4 is a view showing a1 st modification of the stator core component sheet shown in fig. 1.

Fig. 5 is a view showing a2 nd modification of the stator core component sheet shown in fig. 1.

Fig. 6 is a view showing a3 rd modification of the stator core component sheet shown in fig. 1.

Fig. 7 is a view showing a4 th modification of the stator core constituting sheet shown in fig. 1.

Fig. 8 is a view showing a 5 th modification of the stator core constituting sheet shown in fig. 1.

Fig. 9 is a view showing a 6 th modification of the stator core constituting sheet shown in fig. 1.

Fig. 10 is a view showing a modification 7 of the stator core constituting sheet shown in fig. 1.

Fig. 11 is a view showing a modification 8 of the stator core constituting sheet shown in fig. 1.

Fig. 12 is a perspective view of a stator core according to embodiment 2.

Fig. 13 is a view 1 showing a relationship between cogging torque and slot width generated in the rotors according to

embodiments

1 and 2.

Fig. 14 is a2 nd view showing a relationship between a cogging torque and a slot width generated in the rotors according to

embodiments

1 and 2.

Detailed Description

Next, a stator core constituting sheet and a rotating electrical machine according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments.

Embodiment 1.

Fig. 1 is a cross-sectional view in a direction perpendicular to the axial direction of the central shaft of a rotating electric machine having a stator core according to embodiment 1. Fig. 2 is an oblique view of the stator core constituent sheet shown in fig. 1. Fig. 3 is a view of the stator core constituting sheet shown in fig. 1 as viewed from an end surface side of the stator core in the axial direction of the central shaft of the rotary electric machine.

A rotating electric machine 100 shown in fig. 1 includes a stator 1 and a rotor 2 provided inside the stator 1. The rotating electrical machine 100 is a 10-pole, 12-slot motor.

The rotor 2 includes a rotor core 21, a shaft 22 provided on the rotor core 21, and a plurality of permanent magnets 23. The number of magnetic poles 24 of the rotor 2 produced by the permanent magnets 23 is 10.

The rotor core 21 is formed by laminating a plurality of thin plates annularly punched from an electromagnetic steel plate base material, not shown, in the axial direction of the central axis AX of the annular stator core 11. The axial direction of the center axis AX of the stator core 11 is the direction indicated by the arrow D1 in fig. 2, and is equal to the axial direction of the center axis of the rotating electric machine 100. The plurality of thin plates are fixed to each other by riveting, welding, or adhesion. A gap is ensured between the rotor core 21 and the stator 1. The plurality of permanent magnets 23 may be embedded in the rotor core 21, or may be provided on the outer peripheral surface of the rotor core 21. The shaft 22 is fixed to the shaft center portion of the rotor core 21 by shrink fitting, cold press fitting, or press fitting.

The stator 1 includes a stator core 11 formed by annularly connecting a plurality of stator core component pieces 11a, and a winding 12 formed by winding a coil that generates a rotating magnetic field around the stator core 11. The stator core constituting sheet 11a is formed by laminating a plurality of thin sheets, which are T-shaped punched from an electromagnetic steel sheet base material, not shown, in the axial direction D1. The plurality of thin plates are fixed to each other by riveting, welding, or adhesion. The cross-sectional shape of the stator core constituting piece 11a perpendicular to the axial direction D1 is symmetrical with respect to a bisector CP10 of the cross-sectional shape. The bisector CP10 is a line that bisects the tip end portion 11a21 in the circumferential direction D2. Is a line extending in the central axis AX direction from the circumferential center 11a111 of the back yoke 11a 1. The circumferential center 11a111 is located on a line 8 that bisects the width of the outer peripheral portion 11a11 of the back yoke 11a1 in the circumferential direction D2.

The plurality of stator core component pieces 11a each have a back yoke 11a1 and teeth 11a2 provided on the inner peripheral side 11a1a of the back yoke 11a 1. The teeth 11a2 extend from the back yoke 11a1 toward the central axis AX. The teeth 11a2 have a base portion 11a22 extending in the central axis AX direction from the circumferential center 11a111 of the back yoke 11a1, and a tip portion 11a21 provided on the inner circumferential side of the base portion 11a 22. The line shown by reference numeral 11a22a denotes a boundary between the base portion 11a22 and the leading end portion 11a 21. Each of the plurality of teeth 11a2 is separated in the circumferential direction D2 of the stator 1 and arranged radially. The circumferential direction D2 is equal to the circumferential direction of the stator core 11. On the stator 1, slots 11a3 are formed in the regions between the adjacent teeth 11a 2.

Fig. 2 and 3 show 1 of the plurality of stator-core constituent pieces 11a shown in fig. 1. The teeth 11a2 have a base portion 11a22 extending from the back yoke 11a1 toward the central axis AX and a leading end portion 11a 21. The leading end portion 11a21 is formed on the stator core center side of the teeth 11a2 in the radial direction D3. A mounting root 11a23 is formed between the base 11a22 and the leading end 11a 21. The mounting root 11a23 is located at the boundary 11a22a between the base 11a22 and the leading end 11a 21. The distal end portion 11a21 has a shape extending in the circumferential direction D2. The inner peripheral portion 4 of the distal end portion 11a21 faces the rotor 2 shown in fig. 1.

A groove 3 is formed in the inner peripheral portion 4 of the distal end portion 11a 21. The groove 3 is formed in the center portion in the circumferential direction D2 of the distal end portion 11a 21. The groove 3 is formed by the 1 st groove 31 and the 2 nd groove 32, and has a shape in which the width in the circumferential direction D2 gradually narrows toward the outside in the radial direction D3.

Each of the 1 st groove 31 and the 2 nd groove 32 is recessed from the central axis AX shown in fig. 1 toward the outer peripheral portion 11a11 of the back yoke 11a 1. The 1 st slot 31 extends from one end surface to the other end surface of the tooth 11a2 in the axial direction D1 of the central axis AX of the stator core 11. The 2 nd groove 32 is formed at a central portion in the circumferential direction D2 of the 1 st groove 31 and outside the 1 st groove 31 in the radial direction D3. The 2 nd slot 32 extends from one end surface of the tooth 11a2 to the other end surface in the axial direction D1 of the central axis AX of the stator core 11.

The corner 5 is formed at the front end portion 11a 21. The corner portion 5 is formed between the inner peripheral portion 4 of the leading end portion 11a21 and the 1 st groove 31.

As shown in fig. 3, when the width in the circumferential direction D2 of the 1 st groove 31 is W1, the width in the circumferential direction D2 of the base 11a22 of the tooth 11a2 is W2, and the width in the circumferential direction D2 of the 2 nd groove 32 is W3, the width W1 is narrower than the width W2 and wider than the width W3.

When the width from the bottom surface 32a of the 2 nd groove 32 to the corner 5 in the radial direction D3 is W4 and the width from the mounting base 11a23 to the 1 st intersection point IP1 in the radial direction D3 is W5, the width W4 is narrower than the width W5. The width W4 is equal to the maximum depth of the slot 3. The width W5 is equal to the minimum radial thickness of the leading end portion 11a21 from the inner peripheral portion 4 of the leading end portion 11a21 to the boundary 11a22a between the leading end portion 11a21 and the base portion 11a 22. That is, the maximum depth of the groove 3 is shallower than the minimum radial thickness of the leading end portion 11a 21. The 1 st intersection IP1 is the intersection of the bisector CP10 and the virtual curve 11a 4. The virtual curve 11a4 is a line extending a curve of the inner peripheral surface of the tip end portion 11a21 to the groove 3 in a cross section perpendicular to the central axis AX direction.

When the width in the radial direction from the 1 st intersection point IP1 to the 2 nd intersection point IP2 of the boundary 11a22a and the bisector CP10 is set to the 1 st width (W5), and the width in the radial direction from the 1 st intersection point IP1 to the 3 rd intersection point IP3 is set to the 2 nd width (W4), the 2 nd width is narrower than the 1 st width. The 3 rd intersection IP3 is the intersection of the bottom 32a of the groove 3 and the bisector CP 10.

According to the stator core 11 of embodiment 1, the width of the slots 3 in the circumferential direction D2 is gradually narrowed outward in the radial direction D3, and thus both the cogging torque caused by the combination of the number of magnetic poles and the number of slots and the cogging torque caused by the fluctuation of the magnetic force of the permanent magnets 23 can be reduced. The cogging torque generated by the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W1 of the 1 st slot 31, and the cogging torque generated by the fluctuation of the magnetic force of the permanent magnet 23 is reduced by adjusting the width W3 of the 2 nd slot 32.

Specifically, in the case of a 10-pole 12-slot rotating electric machine, cogging torque generated by a combination of the number of magnetic poles and the number of slots is generated 60 times and 120 times per one rotation of the rotor 2 shown in fig. 1. 60 times is the least common multiple of 10 and 12. In the case of a 10-pole, 12-slot rotating electric machine, cogging torque due to fluctuations in the magnetic force of the permanent magnets 23 is generated 12 times and 24 times per rotation of the rotor 2 shown in fig. 1. The 12 times and the 24 times are integral multiples of the number of slots.

According to the stator core 11 of embodiment 1, the cogging torque generated in the number of times of 60 and 120 times is reduced by adjusting the width W1 of the 1 st slot 31, and the cogging torque generated in the number of 12 times is reduced by adjusting the width W3 of the 2 nd slot 32. In the stator core 11 according to embodiment 1, the 2 nd slot 32 is provided, so that the magnetic permeability increases 24 times and the cogging torque increases 24 times, but the width in the circumferential direction D2 of the slot 3 is changed stepwise toward the radial direction D3, so that the change in the magnetic permeability is smoothed, and therefore the cogging torque decreases 24 times.

In the stator core 11 shown in fig. 1, the width W4 from the bottom surface 32a of the 2 nd slot 32 to the corner 5 in the radial direction D3 is narrower than the width W5 from the mounting base portion 11a23 to the 1 st intersection point IP1 in the radial direction D3, whereby a decrease in torque due to a decrease in gap magnetic flux density can be prevented. In the stator core 11 shown in fig. 1, since the 2 nd groove 32 is formed in the bottom surface of the 1 st groove 31, punching by a die is easier than in the case where the 1 st groove 31 and the 2 nd groove 32 are formed separately in the inner peripheral portion 4 of the distal end portion 11a 21. Further, since the stator core 11 shown in fig. 1 has the grooves 3 formed in a shape satisfying the relationship of W1 > W3, a decrease in gap magnetic flux density is suppressed, and a decrease in torque is suppressed.

The slots 3 of the stator core component pieces 11a may have a shape satisfying the relationship W1 > W3 × 2. With the above configuration, the gap magnetic flux density is further suppressed from decreasing and the torque is further suppressed from decreasing, compared with the case where the groove 3 having a shape satisfying the relationship of W1 > W3 is formed.

Fig. 4 is a view showing a1 st modification of the stator core component sheet shown in fig. 1. In the teeth 11A2 of the stator core constituting piece 11A shown in fig. 4, grooves 3A are formed instead of the grooves 3 shown in fig. 3. The groove 3A is formed in the inner peripheral portion 4 of the distal end portion 11a21 at the center in the circumferential direction D2 of the distal end portion 11a 21. The groove 3A is composed of a1 st groove 31, a2 nd groove 32, and a3 rd groove 33. The groove 3A has a shape in which the width in the circumferential direction D2 gradually narrows outward in the radial direction D3, and the width in the circumferential direction D2 changes in 3 steps.

The 3 rd groove 33 is formed in the central portion in the circumferential direction D2 of the 2 nd groove 32. The 3 rd slot 33 extends from one end surface to the other end surface of the tooth 11a2 in the axial direction D1 of the center axis AX of the stator core 11 shown in fig. 1.

When the width in the circumferential direction D2 of the 2 nd groove 32 is W3 and the width in the circumferential direction D2 of the 3 rd groove 33 is W6, the width W6 is narrower than the width W3. When the width from the bottom surface 33a of the 3 rd groove 33 to the corner 5 in the radial direction D3 is W4 and the width from the mounting base 11a23 to the 1 st intersection point IP1 in the radial direction D3 is W5, the width W4 is narrower than the width W5. The width W4 is equal to the maximum depth of the groove 3A. The width W5 is equal to the minimum radial thickness of the leading end portion 11a21 from the inner peripheral portion 4 of the leading end portion 11a21 to the boundary 11a22a between the leading end portion 11a21 and the base portion 11a 22. That is, the maximum depth of the groove 3A is shallower than the minimum radial thickness of the leading end portion 11a 21.

When the width in the radial direction from the 1 st intersection point IP1 to the 2 nd intersection point IP2 of the boundary 11a22a and the bisector CP10 is set to the 1 st width (W5), and the width in the radial direction from the 1 st intersection point IP1 to the 3 rd intersection point IP3 is set to the 2 nd width (W4), the 2 nd width is narrower than the 1 st width. The 3 rd intersection IP3 is the intersection of the bottom 33A of the groove 3A and the bisector CP 10.

According to the stator core 11 using the stator core constituting piece 11A shown in fig. 4, the cogging torque generated at times of an integral multiple of the number of slots such as 12 times, 24 times, and 60 times is reduced and the cogging torque generated at times other than the integral multiple of the number of slots is also reduced due to the fluctuation of the magnetic force of the permanent magnet 23.

Fig. 5 is a view showing a2 nd modification of the stator core component sheet shown in fig. 1. In the teeth 11a2 of the stator core constituting piece 11B shown in fig. 5, grooves 3B are formed instead of the grooves 3 shown in fig. 3. The groove 3B is formed in the inner peripheral portion 4 of the distal end portion 11a21 at the center in the circumferential direction D2 of the distal end portion 11a 21. The groove 3B has a shape in which the width in the circumferential direction D2 gradually widens outward in the radial direction D3. In other words, the groove 3B has a shape in which the width in the circumferential direction D2 gradually narrows toward the inside in the radial direction D3.

When the width in the circumferential direction D2 of the groove 3B on the side of the back yoke 11a1 is W1, the width in the circumferential direction D2 of the base 11a22 of the tooth 11a2 is W2, and the width in the circumferential direction D2 of the groove 3B on the opposite side of the back yoke 11a1 is W3, the width W1 is narrower than the width W2 and wider than the width W3.

The corner 5 is formed at the front end portion 11a 21. The corner portion 5 is formed between the inner peripheral portion 4 of the leading end portion 11a21 and the groove 3B. When the width from the bottom surface 3B1 to the corner 5 of the groove 3B in the radial direction D3 is W4 and the width from the mounting base portion 11a23 to the 1 st intersection point IP1 in the radial direction D3 is W5, the width W4 is narrower than the width W5. The width W4 is equal to the maximum depth of the groove 3B. The width W5 is equal to the minimum radial thickness of the leading end portion 11a21 from the inner peripheral portion 4 of the leading end portion 11a21 to the boundary 11a22a between the leading end portion 11a21 and the base portion 11a 22. That is, the maximum depth of the groove 3B is shallower than the minimum radial thickness of the leading end portion 11a 21.

When the width in the radial direction from the 1 st intersection point IP1 to the 2 nd intersection point IP2 of the boundary 11a22a and the bisector CP10 is set to the 1 st width (W5), and the width in the radial direction from the 1 st intersection point IP1 to the 3 rd intersection point IP3 is set to the 2 nd width (W4), the 2 nd width is narrower than the 1 st width. The 3 rd intersection IP3 is the intersection of the bottom surface 3B1 of the groove 3B and the bisector CP 10.

According to the stator core 11 using the stator core constituting sheet 11B shown in fig. 5, the cogging torque generated at times of an integral multiple of the number of slots such as 12 times, 24 times, and 60 times is reduced due to the fluctuation of the magnetic force of the permanent magnet 23, and the cogging torque generated at times other than the integral multiple of the number of slots is also reduced. In addition, according to stator core 11 using stator core component sheet 11B, since width W1 is wider than width W3, leakage magnetic flux between slots is reduced, and a decrease in torque at the time of high load is suppressed. Specifically, in the rotating electric machine 100 under a high load, the leakage magnetic flux flowing through the adjacent teeth 11a2 via the distal end portion 11a21 increases. Therefore, the reduction in torque becomes large in the rotary electric machine 100 having a large slot opening width. When the width W1 is wider than the width W3, the leakage magnetic flux flowing through the tip end portion 11a21 and flowing through the adjacent teeth 11a2 is suppressed in the slot upper step portion, and therefore the leakage magnetic flux is reduced and the reduction of the torque is reduced. The slot upper step portion is a portion corresponding to a region on the mounting base portion 11a23 side of the tip end portion 11a21 in the slot 11a3 shown in fig. 2.

Fig. 6 is a view showing a3 rd modification of the stator core component sheet shown in fig. 1. In the teeth 11a2 of the stator core constituting sheet 11C shown in fig. 6, groove groups 3C are formed instead of the grooves 3 shown in fig. 3. The groove group 3C is formed in the center portion in the circumferential direction D2 of the leading end portion 11a21 in the inner peripheral portion 4 of the leading end portion 11a 21. The groove group 3C includes 21 st grooves 31 formed in the inner peripheral portion 4 of the leading end portion 11a21 and 2 nd grooves 32 formed in the inner peripheral portion 4 of the leading end portion 11a 21.

The 2 nd groove 32 is provided between the 21 st grooves 31, and the 21 st grooves 31 and the 2 nd grooves 32 are arranged in the order of the 1 st groove 31, the 2 nd groove 32, and the 1 st groove 31 in the circumferential direction D2. The 1 st groove 31 and the 2 nd groove 32 are arranged apart from each other in the circumferential direction D2. A projection 41 is formed between the 1 st groove 31 and the 2 nd groove 32.

A corner 51 is formed between the inner peripheral portion 4 of the leading end portion 11a21 and the 1 st groove 31. A corner portion 52 is formed between the inner peripheral portion 4 of the leading end portion 11a21 and the 2 nd groove 32.

When the width from the bottom surface 31a of the 1 st groove 31 to the corner 51 in the radial direction D3 is W41, the width from the bottom surface 32a of the 2 nd groove 32 to the corner 52 in the radial direction D3 is W42, and the width from the mounting base portion 11a23 to the 1 st intersection point IP1 in the radial direction D3 is W5, the width W42 is narrower than the width W5 and wider than the width W41. The width W42 is equal to the maximum depth of the 2 nd slot 32. The width W5 is equal to the minimum radial thickness of the leading end portion 11a21 from the inner peripheral portion 4 of the leading end portion 11a21 to the boundary 11a22a between the leading end portion 11a21 and the base portion 11a 22. That is, the maximum depth of the 2 nd groove 32 is shallower than the minimum radial thickness of the leading end portion 11a 21.

When the width in the radial direction from the 1 st intersection point IP1 to the 2 nd intersection point IP2 of the boundary 11a22a and the bisector CP10 is set to the 1 st width (W5), and the width in the radial direction from the 1 st intersection point IP1 to the 3 rd intersection point IP3 is set to the 2 nd width (W4), the 2 nd width is narrower than the 1 st width. The 3 rd intersection IP3 is the intersection of the bottom 32a of the 2 nd groove 32 and the bisector CP 10.

When the width from one corner 51 to the other corner 51 in the circumferential direction D2 is W1, the width in the circumferential direction D2 of the 1 st groove 31 is W11, the width in the circumferential direction D2 of the base 11a22 of the tooth 11a2 is W2, and the width in the circumferential direction D2 of the 2 nd groove 32 is W3, the width W1 is narrower than the width W2, and the width W11 is narrower than the width W2 and wider than the width W3.

The groove group 3C has a shape in which the width in the circumferential direction D2 gradually narrows outward in the radial direction D3, as in the groove 3 shown in fig. 3. According to the stator core 11 using the stator core constituting sheet 11C shown in fig. 6, the cogging torque due to the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W11 of the 1 st slot 31, and the cogging torque due to the fluctuation of the magnetic force of the permanent magnets 23 is reduced by adjusting the width W3 of the 2 nd slot 32. Further, when the shape of the 1 st groove 31 and the 2 nd groove 32 is not a simple shape such as a circle or a rectangle, but a complicated shape such as a star shape or a V shape, the shape of a die for punching the electromagnetic steel sheet base material may become complicated, making the die difficult, and punching the electromagnetic steel sheet base material may become difficult. According to the stator core 11 using the stator core constituting sheet 11C shown in fig. 6, the shape of the 1 st groove 31 and the 2 nd groove 32 constituting the groove group 3C can be simply rectangular, so that the mold can be easily manufactured, and the stator core 11 can be easily manufactured.

In fig. 3 to 6, an example in which a groove portion having a shape in which the width in the circumferential direction D2 gradually narrows toward the outside or the inside in the radial direction D3 is formed is described. Next, an example in which through holes having a shape in which the width in the circumferential direction D2 gradually narrows toward the outside in the radial direction D3 are formed will be described.

Fig. 7 is a view showing a4 th modification of the stator core constituting sheet shown in fig. 1. The teeth 11a2 of the stator core constituting sheet 11D shown in fig. 7 have through holes 6 formed in place of the grooves 3 shown in fig. 3. The through hole 6 is formed in the center of the distal end portion 11a21 in the circumferential direction D2. The through hole 6 penetrates one end surface and the other end surface of the tooth 11a2 in the axial direction D1 shown in fig. 1.

The through-hole 6 includes a1 st region 6a having a width W1 in the circumferential direction D2 smaller than the width W2 of the base 11a22 and a2 nd region 6b having a width W3 in the circumferential direction D2 smaller than the width W1. The 2 nd region 6b communicates with the 1 st region 6a, and is formed in a central portion of the 1 st region 6a in the circumferential direction D2. The 2 nd region 6b is formed on the base 11a22 side than the 1 st region 6 a.

When the width from the end surface 6D of the 2 nd region 6b in the radial direction D3 to the end surface 6c of the 1 st region 6a in the radial direction D3 on the side opposite to the teeth 11a2 is W4, and the width from the mounting root 11a23 in the radial direction D3 to the 1 st intersection point IP1 is W5, the width W4 is narrower than the width W5. The width W4 is equal to the maximum depth of the through-hole 6 from the inner peripheral portion 4 of the distal end portion 11a21 to the outside in the radial direction. The width W5 is equal to the minimum radial thickness of the leading end portion 11a21 from the inner peripheral portion 4 of the leading end portion 11a21 to the boundary 11a22a between the leading end portion 11a21 and the base portion 11a 22. That is, the maximum depth of the through hole 6 is shallower than the minimum thickness in the radial direction of the distal end portion 11a 21. The 1 st intersection IP1 is an intersection of the bisector CP10 and the inner peripheral surface of the distal end portion 11a 21.

When the width in the radial direction from the 1 st intersection point IP1 to the 2 nd intersection point IP2 of the boundary 11a22a and the bisector CP10 is set to the 1 st width (W5), and the width in the radial direction from the 1 st intersection point IP1 to the 3 rd intersection point IP3 is set to the 2 nd width (W4), the 2 nd width is narrower than the 1 st width. The 3 rd intersection IP3 is an intersection between the radially outer end surface of the through-hole 6 and the bisector CP 10.

As described above, the through-hole 6 has a shape in which the width in the circumferential direction D2 gradually narrows outward in the radial direction D3. According to the stator core 11 using the stator core constituting sheet 11D shown in fig. 7, the cogging torque generated by the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W1 of the 1 st zone 6a, and the cogging torque generated by the fluctuation of the magnetic force of the permanent magnets 23 is reduced by adjusting the width W3 of the 2 nd zone 6 b. In addition, according to the stator core 11 using the stator core constituting sheet 11D shown in fig. 7, since the 1 tooth 11a2 is not provided with a plurality of through holes but only 1 through hole 6 is required, punching by a die becomes easy. In addition, since the

slots

3, 3A, 3B and the slot group 3C shown in fig. 3 to 6 are not provided in the stator core 11 using the stator core constituting sheet 11D shown in fig. 7, there is no reduction in the circularity of the stator inner diameter due to manufacturing variations of the through holes 6 as compared with the case where the

slots

3, 3A, 3B and the slot group 3C are provided, and there is an effect that the circularity of the stator core 11 is improved.

Fig. 8 is a view showing a 5 th modification of the stator core constituting sheet shown in fig. 1. The teeth 11a2 of the stator core forming piece 11E shown in fig. 8 are formed with through hole groups 6A instead of the slots 3 shown in fig. 3. The through hole group 6A is formed in the center portion in the circumferential direction D2 of the distal end portion 11a 21. The through hole group 6A includes 21 st through

holes

61 and 2 nd through holes 62. The 2 nd through-hole 62 is provided between the 21 st through-holes 61, and the 21 st through-holes 61 and the 2 nd through-holes 62 are arranged in the order of the 1 st through-hole 61, the 2 nd through-hole 62, and the 1 st through-hole 61 in the circumferential direction D2. The 1 st through hole 61 and the 2 nd through hole 62 are arranged apart from each other in the circumferential direction D2.

In fig. 8, regarding the position of the end surface of the 1 st through hole 61 opposite to the back yoke 11a1 in the radial direction D3, the portion closest to the 2 nd through hole 62 is the same as the position of the end surface of the 2 nd through hole 62 opposite to the back yoke 11a1 in the radial direction D3.

When the width from the end surface on the back yoke 11a1 side of the 1 st through hole 61 in the radial direction D3 to the end surface on the opposite side of the back yoke 11a1 of the 1 st through hole 61 in the radial direction D3 is W41, the width from the end surface on the back yoke 11a1 side of the 2 nd through hole 62 in the radial direction D3 to the end surface on the opposite side of the back yoke 11a1 of the 2 nd through hole 62 in the radial direction D3 is W42, and the width from the mounting root 11a23 to the 1 st intersection point IP1 in the radial direction D3 is W5, the width W42 is narrower than the width W5 and wider than the width W41. The width W42 is equal to the maximum depth of the 2 nd through hole 62 from the inner peripheral portion 4 of the distal end portion 11a21 toward the outer side in the radial direction. The width W5 is equal to the minimum radial thickness of the leading end portion 11a21 from the inner peripheral portion 4 of the leading end portion 11a21 to the boundary 11a22a between the leading end portion 11a21 and the base portion 11a 22. That is, the maximum depth of the 2 nd through hole 62 is shallower than the minimum thickness in the radial direction of the distal end portion 11a 21. The 1 st intersection IP1 is an intersection of the bisector CP10 and the inner peripheral surface of the distal end portion 11a 21.

When the width in the radial direction from the 1 st intersection point IP1 to the 2 nd intersection point IP2 of the boundary 11a22a and the bisector CP10 is set to the 1 st width (W5), and the width in the radial direction from the 1 st intersection point IP1 to the 3 rd intersection point IP3 is set to the 2 nd width (W4), the 2 nd width is narrower than the 1 st width. The 3 rd intersection IP3 is an intersection between the radially outer end surface of the 2 nd through hole 62 and the bisector CP 10.

When the width from one end surface of one 1 st through hole 61 in the circumferential direction D2 to the other end surface of the other 1 st through hole 61 in the circumferential direction D2 is W1, the width in the circumferential direction D2 of the 1 st through hole 61 is W11, the width in the circumferential direction D2 of the base portion 11a22 of the tooth 11a2 is W2, and the width in the circumferential direction D2 of the 2 nd through hole 62 is W3, the width W1 is narrower than the width W2, and the width W11 is narrower than the width W2 and wider than the width W3.

As described above, the through hole group 6A has a shape in which the width in the circumferential direction D2 gradually narrows toward the outside in the radial direction D3. According to the stator core 11 using the stator core constituting sheet 11E shown in fig. 8, the cogging torque generated by the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W11 of the 1 st through hole 61, and the cogging torque generated by the fluctuation of the magnetic force of the permanent magnet 23 is reduced by adjusting the width W3 of the 2 nd through hole 62.

In addition, according to the stator core 11 using the stator core constituting sheet 11E, the shape of the 1 st through hole 61 and the 2 nd through hole 62 constituting the through hole group 6A can be made simply rectangular, similarly to the 1 st groove 31 and the 2 nd groove 32 shown in fig. 6, and therefore, the mold can be easily manufactured, and the stator core 11 can be easily manufactured. In addition, since the

slots

3, 3A, 3B and the slot group 3C shown in fig. 3 to 6 are not provided in the stator core 11 using the stator core constituting sheet 11E shown in fig. 8, there is no reduction in the circularity of the stator inner diameter due to manufacturing variations of the through hole group 6A as compared with the case where the

slots

Fig. 9 is a view showing a 6 th modification of the stator core constituting sheet shown in fig. 1. The teeth 11a2 of the stator core component sheet 11F shown in fig. 9 have through hole groups 6B formed in place of the grooves 3 shown in fig. 3. The through hole group 6B is formed in the center portion in the circumferential direction D2 of the distal end portion 11a 21. The through hole group 6B includes the 1 st through hole 61 and the 2 nd through hole 62 arranged in the radial direction D3. The 1 st through hole 61 and the 2 nd through hole 62 are arranged apart from each other in the radial direction D3. The 1 st through hole 61 is provided near the inner peripheral portion 4 of the leading end portion 11a21, and the 2 nd through hole 62 is provided on the back yoke 11a1 side of the 1 st through hole 61 and at the center portion in the circumferential direction D2 of the 1 st through hole 61.

When the width from the end surface of the 2 nd through hole 62 on the back yoke 11a1 side in the radial direction D3 to the end surface of the 1 st through hole 61 on the opposite side to the back yoke 11a1 in the radial direction D3 is W4 and the width from the mounting root portion 11a23 to the 1 st intersection point IP1 in the radial direction D3 is W5, the width W4 is narrower than the width W5. The width W4 is equal to the maximum width from the inside in the radial direction of the 1 st through hole 61 to the outside in the radial direction of the 2 nd through hole 62. The width W5 is equal to the minimum radial thickness of the leading end portion 11a21 from the inner peripheral portion 4 of the leading end portion 11a21 to the boundary 11a22a between the leading end portion 11a21 and the base portion 11a 22. That is, the maximum width from the inside of the 1 st through hole 61 in the radial direction to the outside of the 2 nd through hole 62 in the radial direction is narrower than the minimum thickness of the distal end portion 11a21 in the radial direction. The 1 st intersection IP1 is an intersection of the bisector CP10 and the inner peripheral surface of the distal end portion 11a 21.

When the width in the circumferential direction D2 of the 1 st through hole 61 is W1, the width in the circumferential direction D2 of the base 11a22 of the tooth 11a2 is W2, and the width in the circumferential direction D2 of the 2 nd through hole 62 is W3, the width W1 is narrower than the width W2 and wider than the width W3.

As described above, the through hole group 6B has a shape in which the width in the circumferential direction D2 gradually narrows toward the outside in the radial direction D3. According to the stator core 11 using the stator core constituting piece 11F shown in fig. 9, the cogging torque generated by the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W1 of the 1 st through hole 61, and the cogging torque generated by the fluctuation of the magnetic force of the permanent magnet 23 is reduced by adjusting the width W3 of the 2 nd through hole 62. In addition, according to the stator core 11 using the stator core constituting sheet 11F, the shape of the 1 st through hole 61 and the 2 nd through hole 62 constituting the through hole group 6B can be made simply rectangular, similarly to the 1 st groove 31 and the 2 nd groove 32 shown in fig. 6, and therefore, the mold can be easily manufactured, and the stator core 11 can be easily manufactured. In addition, while 3 through holes are provided in the teeth 11a2 in the stator core-constituting sheet 11E shown in fig. 8, the number of through holes can be reduced because 2 through holes are provided in the teeth 11a2 in the stator core-constituting sheet 11F shown in fig. 9. Therefore, the stator core 11 of the stator core constituting sheet 11F shown in fig. 9 is used, and the stator core 11 is easily manufactured.

Fig. 10 is a view showing a modification 7 of the stator core constituting sheet shown in fig. 1. In the teeth 11a2 of the stator core constituting piece 11G shown in fig. 10, grooves 3D and through holes 6C are formed instead of the grooves 3 shown in fig. 3. The groove 3D is formed in the center portion in the circumferential direction D2 of the distal end portion 11a21 in the inner peripheral portion 4 of the distal end portion 11a 21. The through hole 6C is formed in the center portion of the distal end portion 11a21 in the circumferential direction D2. The through hole 6C is formed on the back yoke 11a1 side of the groove 3D in the radial direction D3.

The corner 5 is formed at the front end portion 11a 21. The corner portion 5 is formed between the inner peripheral portion 4 of the leading end portion 11a21 and the groove 3D.

When the width from the end surface of the through hole 6C on the back yoke 11a1 side in the radial direction D3 to the corner 5 is W4 and the width from the mounting base portion 11a23 to the 1 st intersection point IP1 in the radial direction D3 is W5, the width W4 is narrower than the width W5. The width W4 is equal to the maximum width from the corner 5 between the inner peripheral surface of the distal end portion 11a21 and the groove 3D to the outside in the radial direction of the through hole 6C. The width W5 is equal to the minimum radial thickness of the leading end portion 11a21 from the inner peripheral portion 4 of the leading end portion 11a21 to the boundary 11a22a between the leading end portion 11a21 and the base portion 11a 22. The 1 st intersection IP1 is the intersection of the bisector CP10 and the virtual curve 11a 4.

When the width in the radial direction from the 1 st intersection point IP1 to the 2 nd intersection point IP2 of the boundary 11a22a and the bisector CP10 is set to the 1 st width (W5), and the width in the radial direction from the 1 st intersection point IP1 to the 3 rd intersection point IP3 is set to the 2 nd width (W4), the 2 nd width is narrower than the 1 st width. The 3 rd intersection IP3 is an intersection between the radially outer end surface of the through hole 6C and the bisector CP 10.

When the width in the circumferential direction D2 of the groove 3D is W1, the width in the circumferential direction D2 of the base 11a22 of the tooth 11a2 is W2, and the width in the circumferential direction D2 of the through-hole 6C is W3, the width W1 is narrower than the width W2 and wider than the width W3.

According to the stator core 11 using the stator core constituting sheet 11G shown in fig. 10, the cogging torque due to the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W1 of the slot 3D, and the cogging torque due to the fluctuation of the magnetic force of the permanent magnet 23 is reduced by adjusting the width W3 of the through hole 6C. In addition, according to the stator core 11 using the stator core constituting sheet 11G, the shape of the through-hole 6C and the groove 3D can be simply rectangular, similarly to the 1 st groove 31 and the 2 nd groove 32 shown in fig. 6, and therefore, the mold can be easily manufactured, and the stator core 11 can be easily manufactured. In the stator core 11 using the stator core constituting sheet 11G, the width W1 of the slots 3D is increased as compared with the width W3 of the through-holes 6C, whereby a decrease in the gap magnetic flux density can be suppressed, and a decrease in the torque can be minimized.

In fig. 10, an example in which the width W1 of the groove 3D is wider than the width W3 of the through-hole 6C is described, but the same effect is obtained also in the case where the width W1 of the groove 3D is narrower than the width W3 of the through-hole 6C.

Fig. 11 is a view showing a modification 8 of the stator core constituting sheet shown in fig. 1. In the teeth 11a2 of the stator core constituting piece 11H shown in fig. 11, 2 slots 3E and through holes 6D are formed instead of the slots 3 shown in fig. 3. The 2 grooves 3E and the through holes 6D are formed in the inner peripheral portion 4 of the distal end portion 11a21 at the center in the circumferential direction D2 of the distal end portion 11a 21. The through-hole 6D is provided between the 2 grooves 3E, and the 2 grooves 3E and the through-hole 6D are arranged in the circumferential direction D2 in the order of the groove 3E, the through-hole 6D, and the groove 3E.

A corner portion 5 is formed between the inner peripheral portion 4 of the leading end portion 11a21 and the groove 3E. When the width from the end surface of the through hole 6D on the back yoke 11a1 side in the radial direction D3 to the corner 5 is W41, the width from the bottom surface 3E1 of the groove 3E in the radial direction D3 to the corner 5 is W42, and the width from the mounting root 11a23 in the radial direction D3 to the 1 st intersection point IP1 is W5, the width W41 is narrower than the width W5 and wider than the width W42. The width W42 is narrower than the width of the through-hole 6D in the radial direction D3. The width W4 is equal to the maximum width from the corner 5 between the inner peripheral surface of the distal end 11a21 and the groove 3E to the outside in the radial direction of the through hole 6D. The width W5 is equal to the minimum radial thickness of the leading end portion 11a21 from the inner peripheral portion 4 of the leading end portion 11a21 to the boundary 11a22a between the leading end portion 11a21 and the base portion 11a 22. The 1 st intersection IP1 is an intersection of the bisector CP10 and the inner peripheral surface of the distal end portion 11a 21.

When the width in the radial direction from the 1 st intersection point IP1 to the 2 nd intersection point IP2 of the boundary 11a22a and the bisector CP10 is set to the 1 st width (W5), and the width in the radial direction from the 1 st intersection point IP1 to the 3 rd intersection point IP3 is set to the 2 nd width (W4), the 2 nd width is narrower than the 1 st width. The 3 rd intersection IP3 is an intersection between the radially outer end surface of the through hole 6D and the bisector CP 10.

When the width from one end surface of one groove 3E in the circumferential direction D2 to the other end surface of the other groove 3E in the circumferential direction D2 is W1, the width in the circumferential direction D2 of the groove 3E is W11, the width in the circumferential direction D2 of the base portion 11a22 of the tooth 11a2 is W2, and the width in the circumferential direction D2 of the through-hole 6D is W3, the width W1 is narrower than the width W2, and the width W3 is narrower than the width W1 and equal to the width W11.

According to the stator core 11 using the stator core constituting piece 11H shown in fig. 11, the cogging torque generated by the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W1 including 2 slots 3E, and the cogging torque generated by the fluctuation of the magnetic force of the permanent magnet 23 is reduced by adjusting the width W3 of the through hole 6D. In addition, according to the stator core 11 using the stator core constituting sheet 11H, the shape of the through hole 6D and the groove 3E can be simply rectangular, similarly to the 1 st groove 31 and the 2 nd groove 32 shown in fig. 6, and therefore, the mold can be easily manufactured, and the stator core 11 can be easily manufactured. In addition, according to the stator core 11 using the stator core constituting sheet 11H, by providing the plurality of slots 3E, the cogging torque generated by the combination of the number of magnetic poles and the number of slots is further reduced.

Embodiment 2.

Fig. 12 is a perspective view of a stator core according to embodiment 2. The stator core 1A is constituted by a plurality of stator-core constituting pieces 11J instead of the plurality of stator-core constituting pieces 11A shown in fig. 1. The slots 3 shown in fig. 3 are formed at a plurality of positions in the tip end portions 11a21 of the teeth 11a2 of the stator core constituting piece 11J. The plurality of grooves 3 are arranged apart from each other in the axial direction D1. The stator core component sheet 11J is formed by alternately laminating a1 st steel plate group 7a formed of a plurality of thin plates having the grooves 3 formed therein and a2 nd steel plate group 7b formed of a plurality of thin plates having no grooves formed therein in the axial direction D1.

In the stator core 1A, the width in the circumferential direction D2 of each of the 1 st and 2

nd slots

31 and 32 shown in fig. 3 is adjusted so that the phases of the cogging torque generated in the 1 st steel plate group 7a and the cogging torque generated in the 2 nd steel plate group 7b are reversed. The phase and amplitude of the cogging torque generated by the combination of the number of magnetic poles and the number of slots are adjusted according to the width W1 of the 1 st slot 31, and the phase and amplitude of the cogging torque generated by the fluctuation of the magnetic force of the permanent magnet 23 are adjusted according to the width W3 of the 2 nd slot 32.

Further, by adjusting the lamination thickness in the axial direction D1 of the 1 st steel plate group 7a and the 2 nd steel plate group 7b, the amplitude of the cogging torque of phase inversion is adjusted in each tooth, and the cogging torque generated in each tooth is added to reduce the cogging torque of the entire stator. Further, by forming the groove 3 locally at the distal end portion 11a21, there is an effect that a decrease in the gap magnetic flux density is suppressed and the torque is improved, as compared with the case where the groove 3 is formed over the entire region from one end to the other end in the axial direction D1 of the distal end portion 11a 21.

In

embodiment

2, 3 grooves 3 are formed from one end to the other end of the distal end portion 11a21 in the axial direction D1, but the number of grooves 3 is not limited to the illustrated example as long as it is 2 or more.

In embodiment 2, the example in which the groove 3 is formed has been described, but the same effect can be obtained also when, instead of the

groove

3, 2 or more grooves shown in fig. 4 to 6 or through-holes shown in fig. 7 to 9 are formed from one end to the other end of the distal end portion 11a21 in the axial direction D1.

Further, although the example in which the groove 3 is formed in embodiment 2 has been described, the same effect can be obtained also when 2 or more grooves and through-holes shown in fig. 10 or 11 are formed from one end to the other end of the distal end portion 11a21 in the axial direction D1 instead of the groove 3.

In

embodiments

1 and 2, an example in which a groove or a through hole is formed in a tooth provided in a stator core of a rotating electrical machine is described, but the same effects can be obtained when the groove or the through hole described in

embodiments

1 and 2 is applied to a stator of a linear motor.

In

embodiments

1 and 2, the groove or the through hole is formed in the center portion in the circumferential direction D2 of the tooth tip portion, but in the case where the groove or the through hole is formed at a position close to the end portion in the circumferential direction D2 of the tooth tip portion, the same effect can be obtained if the width in the circumferential direction D2 of the groove or the through hole is gradually narrowed toward the outer side or the inner side in the radial direction D3.

In

embodiments

1 and 2, the groove or the through hole is formed symmetrically in the circumferential direction D2 with respect to the center portion in the circumferential direction D2 of the tooth tip portion, but if the width in the circumferential direction D2 of the groove or the through hole is gradually narrowed toward the outer side or the inner side in the radial direction D3, the same effect can be obtained even if the groove or the through hole is asymmetrical.

In

embodiments

1 and 2, the stator core in which a plurality of stator core constituting pieces are annularly connected has been described, but instead of the stator core constituted by a plurality of stator core constituting pieces, the same effect can be obtained by forming slots or through holes having a shape in which the width in the circumferential direction D2 of the slots or through holes gradually narrows toward the outer side or the inner side in the radial direction D3, in any of a stator core constituted by laminating annularly punched stator core constituting pieces, a wrapped core connected to a part of the stator core, a wrapped core in which the stator cores are partially stacked, and a stator core divided core in which the core holder and the teeth are separated.

embodiments

1 and 2. The vertical axis of fig. 13 shows cogging torque T1 generated by fluctuation of the magnetic force of the magnet, and the horizontal axis of fig. 13 shows the width W3 of the 2 nd slot 32 shown in fig. 3 and the like in a ratio with the reference value of 1. Fig. 14 is a2 nd view showing a relationship between a cogging torque and a slot width generated in the rotors according to

embodiments

1 and 2. The vertical axis of fig. 14 shows the cogging torque T2 generated by the combination of the number of magnetic poles and the number of slots, and the horizontal axis of fig. 14 shows the width W1 of the 1 st slot 31 shown in fig. 3 and the like by a ratio with the reference value of 1.

By changing the width W3 of the 2 nd slot 32, the magnetic permeability distribution of the gap changes, and the amplitude and phase of the cogging torque generated by the magnetic permeability change. It is understood that the inclination of the cogging torque in the region where the width W3 of the 2 nd slot 32 is less than 0.4 p.u and the inclination of the cogging torque in the region where the width W3 of the 2 nd slot 32 is greater than 0.4 p.u are different. It is understood that the inclination of the cogging torque in the region where the width W1 of the 1 st slot 31 is less than 0.4 p.u is different from the inclination of the cogging torque in the region where the width W1 of the 1 st slot 31 is greater than 0.7 p.u. Further, it is found that the inclination of the cogging torque from 0.4[ p.u ] to 0.7[ p.u ] is changed by the width W1 of the 1 st groove 31. In the stator core according to the present embodiment, the width of the slot or the through hole is set in consideration of the relationship between the cogging torque and the slot width as described above.

The configuration described in the above embodiment is an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified without departing from the scope of the present invention.

Description of the reference numerals

1 stator, 2 rotor, 3A, 3B, 3D, 3E slots, 3B1, 3E1, 31A, 32a, 33A bottom surface, 3C slot group, 4 inner peripheral portion, 5, 51, 52 corner portion, 6C, 6D through hole, 6A, 6B through hole group, 6A 1 st region, 6B 2 nd region, 6C, 6D end surface, 7a 1 st steel plate group, 7B 2 nd steel plate group, 8 line, 11 stator core, 11A, 11B, 11C, 11D, 11E, 11F, 11G, 11H, 11J stator core forming piece, 11A1 back yoke, 11A1A inner peripheral side, 11A22a boundary, 11A11, 11A111 circumferential center, 11A2 tooth, 11A21 front end portion, 11A22 base portion, 11A23 mounting base portion, 11A23 winding base portion, 11A3, 11A4, 11A winding 12, 3D rotor shaft, 3D slot group, 3D, 11A, 11B through hole group, 11A, 11B stator core forming piece, 11B back yoke, 11B, 41 projection, 61 1 st through hole, 62 nd through hole, 2 nd through hole, 100 rotating electrical machine, IP 11 st intersection, IP 22 nd intersection, IP 33 rd intersection.

Claims

1. A stator core forming sheet is formed by a plurality of stator core forming sheets to form an annular stator core,

the stator core constituting sheet is characterized in that,

the stator core constituting pieces are constituted by a back yoke and teeth provided on an inner peripheral side of the back yoke,

the teeth have a base portion extending in a central axis direction from a circumferential center of the back yoke and a tip portion provided on an inner circumferential side of the base portion,

a groove having a shape in which a width in a circumferential direction changes stepwise outward in a radial direction of the stator core is formed in an inner peripheral portion of the tip end portion,

the width of the slot varies non-continuously,

a width in a radial direction from a1 st intersection point to a2 nd intersection point in a cross section perpendicular to the central axis direction is set to be a1 st width, the 1 st intersection point being an intersection point between a virtual curve extending a curve of an inner peripheral surface of the tip portion to the groove and a bisector line bisecting the tip portion in a circumferential direction, the 2 nd intersection point being an intersection point between the bisector line and a boundary between the base portion and the tip portion,

when the width in the radial direction from the 1 st intersection point to the 3 rd intersection point of the bottom surface of the groove and the bisector is defined as the 2 nd width,

the 2 nd width is narrower than the 1 st width.

2. The stator core constituting sheet according to claim 1,

the groove having a shape in which the width in the circumferential direction gradually decreases toward the outer side in the radial direction is composed of a1 st groove and a2 nd groove formed in the circumferential direction center of the 1 st groove and formed in the outer side in the radial direction of the 1 st groove,

a width in the circumferential direction of the 1 st groove is wider than a width in the circumferential direction of the 2 nd groove.

3. The stator core constituting sheet according to claim 2,

a width of the 1 st groove in the circumferential direction is wider than 2 times a width of the 2 nd groove in the circumferential direction.

4. The stator core constituting sheet according to any one of claims 1 to 3,

the slots are formed at 8 or more corners, and the width in the circumferential direction changes stepwise toward the outside in the radial direction of the stator core.

5. The stator core constituting sheet according to claim 1,

the number of the grooves is 2 or more in the tip end portion from one end of the tip end portion to the other end in the axial direction of the stator core.

6. A stator core forming sheet is formed by a plurality of stator core forming sheets to form an annular stator core,

the stator core constituting sheet is characterized in that,

a plurality of 1 st grooves arranged at intervals in the circumferential direction and a2 nd groove provided between the 1 st grooves are formed in an inner peripheral portion of the tip portion,

a width of the 2 nd slot in a radial direction of the stator core is wider than a width of the 1 st slot in the radial direction,

a width in a radial direction from the 1 st intersection point to a3 rd intersection point of the bisector and a bottom surface of the 2 nd groove facing outward in the radial direction from the inner peripheral portion of the distal end portion is defined as a2 nd width,

the 2 nd width is narrower than the 1 st width.

7. The stator core constituting sheet according to claim 6,

in the tip portion, a plurality of the 1 st and 2 nd slots form 2 or more groups from one end to the other end of the tip portion in the axial direction of the stator core.

8. A stator core forming sheet is formed by a plurality of stator core forming sheets to form an annular stator core,

the stator core constituting sheet is characterized in that,

a through hole having a shape in which a width in a circumferential direction changes stepwise outward in a radial direction of the stator core is formed in an inner peripheral portion of the tip portion,

a width in a radial direction from a1 st intersection point of an inner peripheral surface of the tip portion and a bisector that bisects the tip portion in a circumferential direction to a2 nd intersection point of a boundary between the base portion and the tip portion and the bisector is defined as a1 st width in a cross section perpendicular to the central axis direction,

when the width in the radial direction from the 1 st intersection point to the 3 rd intersection point of the radial outer end surface of the through-hole and the bisector is set as the 2 nd width,

the 2 nd width is narrower than the 1 st width.

9. The stator core constituting sheet according to claim 8,

the number of the through holes is 2 or more in the tip end portion from one end of the tip end portion to the other end in the axial direction of the stator core.

10. A stator core forming sheet is formed by a plurality of stator core forming sheets to form an annular stator core,

the stator core constituting sheet is characterized in that,

a plurality of 1 st through holes arranged in a circumferentially spaced manner and a2 nd through hole provided between the 1 st through holes are formed in an inner peripheral portion of the tip portion,

a width of the 2 nd through hole in a radial direction of the stator core is wider than a width of the 1 st through hole in the radial direction,

when the width in the radial direction from the 1 st intersection point to the 3 rd intersection point of the radial outer end surface of the 2 nd through hole and the bisector is set as the 2 nd width,

the 2 nd width is narrower than the 1 st width.

11. The stator core constituting sheet according to claim 10,

in the tip portion, a number of the 1 st through-holes and the 2 nd through-holes is 2 or more from one end to the other end of the tip portion in the axial direction of the stator core.

12. A stator core forming sheet is formed by a plurality of stator core forming sheets to form an annular stator core,

the stator core constituting sheet is characterized in that,

a1 st through hole and a2 nd through hole provided between the 1 st through hole and the back yoke are formed in an inner peripheral portion of the front end portion,

a width of the 2 nd through hole in the circumferential direction is narrower than a width of the 1 st through hole in the circumferential direction,

the 2 nd width is narrower than the 1 st width.

13. The stator core constituting sheet according to claim 12,

in the tip portion, the number of the 1 st through-holes and the 2 nd through-holes is 2 or more from one end to the other end of the tip portion in the axial direction of the stator core.

14. A stator core forming sheet is formed by a plurality of stator core forming sheets to form an annular stator core,

the stator core constituting sheet is characterized in that,

a groove is formed in an inner peripheral portion of the front end portion, and a through hole provided between the groove and the back yoke is formed separately from the groove,

a width in a circumferential direction of the groove is wider than a width in the circumferential direction of the through-hole or narrower than the width in the circumferential direction of the through-hole,

the 2 nd width is narrower than the 1 st width.

15. The stator core constituting sheet according to claim 14,

the number of the sets of the slots and the through holes is 2 or more in the tip portion from one end of the tip portion to the other end in the axial direction of the stator core.

16. A stator core forming sheet is formed by a plurality of stator core forming sheets to form an annular stator core,

the stator core constituting sheet is characterized in that,

a plurality of grooves arranged at intervals in the circumferential direction are formed in the inner peripheral portion of the tip portion, and through-holes are formed between the plurality of grooves,

the 2 nd width is narrower than the 1 st width.

17. The stator core constituting sheet according to claim 16,

in the tip portion, a number of the sets of the plurality of grooves and the through holes is 2 or more from one end to the other end of the tip portion in the axial direction of the stator core.

18. A rotating electrical machine having a stator core configured by annularly connecting a plurality of stator core configuration pieces according to any one of claims 1 to 17.