Stator, Rotor, and Rotating Electric Machine

Abstract

The present invention provides a stator, a rotor, and a rotating electric machine that suppress cogging effects and fluctuations caused by gaps between core segments. A stator includes: a plurality of core segments having notches extending in the axial direction; and a plurality of pins press-fitted into pin press-fitting holes formed by the notches provided in adjacent core segments and facing each other. The plurality of core segments are each divided from each other at a dividing surface formed by four or more constituent surfaces extending in the axial direction and including a first surface closest to the air-gap portion, a second surface closer to the air-gap portion than the first surface, and a farthest surface farthest from the air-gap portion. One of the constituent surfaces other than the first surface and the second surface is a pin press-fitting surface provided with the notch, and the direction of the normal line of the pin press-fitting surface faces a direction outside the surface of the first surface or a direction outside the surface of the second surface.

Description

Technical Field

[0001] The present invention relates to a stator, a rotor, and a rotating electric machine. Background Art

[0002] Patent Document 1 describes the following: "A rotating electric machine, characterized in that the rotating electric machine uses an annular fixing portion and a tooth portion formed in a letter T shape by a leg piece and a tooth piece to form a plurality of plate-shaped stator cores, and the plate-shaped stator cores constitute the stator of the rotating electric machine. The base end portions of the leg pieces of the tooth portion are fitted into a plurality of grooves recessed in the fixing portion and integrated. At any position of the fitting portion between the fixing portion and the tooth portion, notches that become circular through fitting are respectively formed. In the notches of the cylindrical holes formed in a communicating state by laminating and fitting a plurality of the fixing portions and the tooth portions, fixing pins having an outer diameter slightly larger than the diameter of the cylindrical holes are pressed in to integrate the fixing portion and the tooth portion."

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2012-165512 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] However, a gap may be generated on the surface (magnetic circuit) on the side where the fixing pin is pressed in the fitting portion between the fixing portion and the tooth portion (multiple core segments). In a rotating electric machine having a stator with such a generated gap, cogging effect and ripple are generated, and thus the characteristics deteriorate. Such a problem can also occur in a rotor having the same structure.

[0008] The present invention provides a stator, a rotor, and a rotating electric machine that can suppress the cogging effect and ripple caused by the gap between the core segments.

[0009] Solutions for Solving the Problems

[0010] One technical solution of the present disclosure is a stator, which includes: a plurality of core segments, each having a notch extending along the axial direction; and a plurality of pins press-fitted into pin press-fitting holes formed by the notches provided in adjacent and opposite core segments. The plurality of core segments are each divided from each other at a dividing surface, and the dividing surface is composed of four or more constituent surfaces extending along the axial direction and including three surfaces, namely, a first surface closest to the magnetic gap portion, a second surface next to the first surface and closer to the magnetic gap portion, and a farthest surface farthest from the magnetic gap portion. One of the constituent surfaces other than the first surface and the second surface is a pin press-fitting surface provided with the notch, and the normal direction of the pin press-fitting surface faces a direction outside the plane of the first surface or a direction outside the plane of the second surface.

[0011] In addition, one technical solution of the present disclosure is a rotor, which includes: a plurality of core segments, each having a notch extending along the axial direction; and a plurality of pins press-fitted into pin press-fitting holes formed by the notches provided in adjacent and opposite core segments. The plurality of core segments are each divided from each other at a dividing surface, and the dividing surface is composed of four or more constituent surfaces extending along the axial direction and including three surfaces, namely, a first surface closest to the magnetic gap portion, a second surface next to the first surface and closer to the magnetic gap portion, and a farthest surface farthest from the magnetic gap portion. One of the constituent surfaces other than the first surface and the second surface is a pin press-fitting surface provided with the notch, and the normal direction of the pin press-fitting surface faces a direction outside the plane of the first surface or a direction outside the plane of the second surface.

[0012] Effects of the Invention

[0013] According to one technical solution of the present disclosure, it is possible to suppress the cogging effect and fluctuations caused by the gaps between the core segments. Description of the Drawings

[0014] Figure 1 is a partial cross-sectional view showing the stator of the first embodiment.

[0015] Figure 2 is for explaining Figure 1 the schematic diagram of the normal direction of the pin press-fitting surface of the stator shown.

[0016] Figure 3 is a partial cross-sectional view showing the rotor of the second embodiment.

[0017] Figure 4 is for explaining Figure 3 the schematic diagram of the normal direction of the pin press-fitting surface of the rotor shown.

[0018] Figure 5 is a partial cross-sectional view showing the stator of the third embodiment.

[0019] Figure 6 is an illustration Figure 5 showing the direction of the normal line of the pin press - in surface of the stator shown.

[0020] Figure 7 is a partial cross - sectional view showing the stator of the fourth embodiment.

[0021] Figure 8 is an illustration Figure 7 showing the direction of the normal line of the pin press - in surface of the stator shown.

[0022] Figure 9A is a diagram for explaining the number of constituent surfaces forming the split surface and is a partial exploded cross - sectional view showing the stator.

[0023] Figure 9B is showing Figure 9A a partial exploded cross - sectional view of a stator equivalent to the stator shown.

[0024] Figure 10A is a partial exploded cross - sectional view showing another stator for explaining the number of constituent surfaces forming the split surface.

[0025] Figure 10B is showing Figure 10A a partial exploded cross - sectional view of a stator equivalent to the stator shown. Detailed implementation manners

[0026] Hereinafter, the stators 1, 3, 4, the rotor 2, and the motor (omitting the reference numerals) of the embodiments will be described with reference to the drawings.

[0027] [First Embodiment]

[0028] First, using Figure 1 , the structures of the stator 1 and the motor (omitting the reference numerals) of the first embodiment will be described. Figure 1 is a partial cross - sectional view showing the stator 1.

[0029] Figure 1 The stator 1 shown and a rotor (not shown) disposed radially inside DR2 ( Figure 1 the lower side in) of the stator 1 together constitute a motor (omitting the reference numerals) as a rotating electrical machine. Specifically, the stator 1 includes a plurality of core segments 10, a plurality of pins P, and a plurality of coils (not shown), etc.

[0030] The plurality of core segments 10 are divided from each other at split surfaces 100 that extend along the axial direction ( Figure 1 the direction passing through the paper surface in) and face each other. The plurality of core segments 10 have a structure that fits together by sliding axially relative to each other.

[0031] The dividing surface 100 is composed of five constituent surfaces 11, 12, 13, 14, and 15 that extend along the axial direction. In addition, the same reference numerals are assigned to the dividing surface 100 and each of the constituent surfaces 11 to 15 at the adjacent core segments 10, 10. The first surface 11 as the first constituent surface is closest to the magnetic gap portion G (radial inner side DR2) which is the gap between the stator 1 and the rotor (not shown). The second surface 12 as the second constituent surface is a surface continuous with the first surface 11 and is next to the first surface 11 in proximity to the magnetic gap portion G. The third surface 13 as the third constituent surface is a surface continuous with the second surface 12 and is next to the second surface 12 in proximity to the magnetic gap portion G.

[0032] The fourth surface 14 as the fourth constituent surface is a surface continuous with the third surface 13 and is next to the third surface 13 in proximity to the magnetic gap portion G. The fourth surface 14 forms a pin press-fitting surface, and the pin press-fitting surface is provided with a notch portion 14a that extends along the axial direction and has a substantially semicircular cross-section. The notch portions 14a provided respectively at the adjacent core segments 10 and facing each other form a pin press-fitting hole that extends along the axial direction and has a substantially circular (unclosed circular) cross-section. The fifth surface 15 as the fifth constituent surface is a surface continuous with the fourth surface 14 and forms the "farthest surface" that is the farthest from the magnetic gap portion G.

[0033] At the adjacent core segments 10, the opposing fifth surfaces (farthest surfaces) 15 are fixed by welding W.

[0034] A plurality of pins P are respectively press-fitted into the pin press-fitting holes. The pin press-fitting holes are formed by the notch portions 14a provided respectively at the adjacent core segments 10 and facing each other.

[0035] Next, use Figure 2 to explain the direction nP of the normal line of the fourth surface (pin press-fitting surface) 14 of the stator 1. Figure 2 is a schematic diagram for explaining the direction nP of the normal line of the fourth surface (pin press-fitting surface) 14 of the stator 1.

[0036] Figure 2 is a schematic diagram showing the first surface 11, the second surface 12, and the fourth surface (pin press-fitting surface) 14 hypothetically overlapped. In Figure 2 , the out-of-plane direction of the first surface 11 is represented by the first shading (shading represented by diagonal lines from the upper right to the lower left), and the direction of the normal line of the first surface 11 is represented by the arrow n1. Also, the out-of-plane direction of the second surface 12 is represented by the second shading (shading represented by diagonal lines from the upper left to the lower right), and the direction of the normal line of the second surface 12 is represented by the arrow n2. In addition, the direction of the normal line of the fourth surface (pin press-fitting surface) 14 is represented by the arrow nP. Furthermore, the direction that is both the out-of-plane direction of the first surface 11 and the out-of-plane direction of the second surface 12 is represented by the shading (crossed shading) obtained by overlapping both the first shading and the second shading.

[0037] As shown inFigure 2 As shown, the direction nP of the normal line of the fourth surface (pin insertion surface) 14 faces outward from the first surface 11 and also faces outward from the second surface 12. Additionally, the direction nP of the normal line of the fourth surface (pin insertion surface) 14 faces the direction between the direction n1 of the normal line of the first surface 11 and the direction n2 of the normal line of the second surface 12.

[0038] In this way, the plurality of core segments 10 are separated from each other at the separation surface 100, which is composed of four or more constituent surfaces 11, 12, 13, 14, 15 that include the first surface 11 closest to the magnetic gap portion G, the second surface 12 next to the first surface 11 and closer to the magnetic gap portion G, and the fifth surface (farthest surface) 15 farthest from the magnetic gap portion G, and extend in the axial direction. The fourth surface (pin insertion surface) 14 is one of the constituent surfaces other than the first surface 11 and the second surface 12, and is a surface whose normal direction nP faces outward from the first surface 11 or outward from the second surface 12. The plurality of pins P are pressed into pin insertion holes formed by the notch portions 14a provided on adjacent core segments 10 and facing each other.

[0039] According to the stator 1 like this, even if the opposing fourth surfaces 14 are separated, or the opposing third surfaces 13 and / or the opposing fifth surfaces 15 are separated, the direction nP of the normal line of the fourth surface (pin insertion surface) 14 still faces outward from the first surface 11 or outward from the second surface 12. Therefore, the first surfaces 11 of adjacent core segments 10 close to the magnetic gap portion G can be made to fit closely to each other, or the second surfaces 12 of adjacent core segments 10 close to the magnetic gap portion G can be made to fit closely to each other. As a result, the cogging effect and fluctuations caused by the gaps between the core segments 10 can be suppressed. Additionally, the core segments 10 can be assembled with high precision.

[0040] Furthermore, in the stator 1, the fourth surface (pin insertion surface) 14 is a constituent surface other than the fifth surface (farthest surface) 15, and preferably, the direction nP of the normal line faces the direction between the direction n1 of the normal line of the first surface 11 and the direction n2 of the normal line of the second surface 12.

[0041] According to the stator 1 like this, since the direction nP of the normal line of the fourth surface (pin insertion surface) 14 faces the direction between the direction n1 of the normal line of the first surface 11 and the direction n2 of the normal line of the second surface 12, the first surfaces 11 of adjacent core segments 10 close to the magnetic gap portion G can be made to fit closely to each other and the second surfaces 12 of adjacent core segments 10 close to the magnetic gap portion G can be made to fit closely to each other. As a result, the cogging effect and fluctuations caused by the gaps between the core segments 10 can be further suppressed. Additionally, the core segments 10 can be assembled with even higher precision.

[0042] In addition, in the adjacent core segments 10 of the stator 1, the opposing fifth surface (farthest surface) 15 is preferably fixed by welding W.

[0043] With respect to the stator 1 configured in this way, since the opposing fifth surface (farthest surface) 15 of the adjacent core segments 10 is fixed by welding W, the rigidity can be improved.

[0044] [Second Embodiment]

[0045] Next, Figure 3 , the structure of the rotor 2 and the motor (reference numerals omitted) of the second embodiment will be described. Figure 3 is a partial cross-sectional view showing the rotor 2.

[0046] Figure 3 The rotor 2 shown together with a stator (not shown) disposed radially outside DR1 of the rotor 2 ( Figure 3 the upper side in ) constitutes a motor (reference numerals omitted). Specifically, the rotor 2 includes a plurality of core segments 20, a plurality of pins P, and a plurality of permanent magnets (not shown), etc.

[0047] The plurality of core segments 20 are divided at dividing surfaces 200 that extend along the axial direction ( Figure 3 the direction passing through the paper surface in ) and oppose each other. The plurality of core segments 20 have a structure that fits together by sliding relative to each other along the axial direction.

[0048] The dividing surface 200 is composed of five constituent surfaces 21, 22, 23, 24, and 25 that extend along the axial direction. The first surface 21 as the first constituent surface is closest to the magnetic gap portion G (radial inner side DR2), which is the gap between the rotor 2 and the stator (not shown). The second surface 22 as the second constituent surface is a surface continuous with the first surface 21 and is next to the first surface 21 in proximity to the magnetic gap portion G. The third surface 23 as the third constituent surface is a surface continuous with the second surface 22 and is next to the second surface 22 in proximity to the magnetic gap portion G.

[0049] The fourth surface 24 as the fourth constituent surface is a surface continuous with the third surface 23 and is next to the third surface 23 in proximity to the magnetic gap portion G. The fourth surface 24 constitutes a pin press-fitting surface, and a notch portion 24a having a substantially semicircular cross-section and extending along the axial direction is provided on the pin press-fitting surface. The notch portions 24a that are respectively provided on the adjacent core segments 20 and oppose each other constitute a pin press-fitting hole that extends along the axial direction and has a substantially circular (non-closed circular) cross-section. The fifth surface 25 as the fifth constituent surface is a surface continuous with the fourth surface 24 and constitutes the "farthest surface" that is the farthest from the magnetic gap portion G.

[0050] The plurality of pins P are respectively press-fitted into the pin press-fitting holes. The pin press-fitting holes are formed by the notch portions 24a that are respectively provided on the adjacent core segments 20 and oppose each other.

[0051] Next, use Figure 4 to explain the direction nP of the normal line of the fourth surface (pin press-in surface) 24 of the rotor 2. Figure 4 It is a schematic diagram for explaining the direction nP of the normal line of the fourth surface (pin press-in surface) 24 of the rotor 2.

[0052] Figure 4 It is a schematic diagram showing the hypothetical overlap of the first surface 21, the second surface 22, and the fourth surface (pin press-in surface) 24. In Figure 4 , the out-of-plane direction of the first surface 21 is represented by the first shading (shading represented by oblique lines from the upper right to the lower left), and the direction of the normal line of the first surface 21 is represented by the arrow n1. Also, the out-of-plane direction of the second surface 22 is represented by the second shading (shading represented by oblique lines from the upper left to the lower right), and the direction of the normal line of the second surface 22 is represented by the arrow n2. In addition, the direction of the normal line of the fourth surface (pin press-in surface) 24 is represented by the arrow nP. Furthermore, the direction that is both the out-of-plane direction of the first surface 21 and the out-of-plane direction of the second surface 22 is represented by the shading (crossed shading) obtained by overlapping both the first shading and the second shading.

[0053] As Figure 4 shown, the direction nP of the normal line of the fourth surface (pin press-in surface) 24 faces the out-of-plane direction of the first surface 21 and the out-of-plane direction of the second surface 22. In addition, the direction nP of the normal line of the fourth surface (pin press-in surface) 24 faces the direction between the direction n1 of the normal line of the first surface 21 and the direction n2 of the normal line of the second surface 22.

[0054] In this way, the plurality of core segments 20 are divided from each other at the dividing surface 200, and the dividing surface 200 is composed of four or more constituent surfaces 21, 22, 23, 24, 25 that include the first surface 21 closest to the magnetic gap portion G, the second surface 22 next to the first surface 21 and closer to the magnetic gap portion G, and the fifth surface (farthest surface) 25 farthest from the magnetic gap portion G and extend in the axial direction. The fourth surface (pin press-in surface) 24 is one of the constituent surfaces other than the first surface 21 and the second surface 22, and is a surface whose normal direction nP faces the out-of-plane direction of the first surface 21 or the out-of-plane direction of the second surface 22. The plurality of pins P are pressed into pin press-in holes formed by notch portions 24a provided in adjacent core segments 20 and facing each other.

[0055] According to the rotor 2 like this, since the direction nP of the normal line of the fourth surface (pin press-fitting surface) 24 faces the direction outside the first surface 21 or the direction outside the second surface 22, it is possible to make the first surfaces 21 of adjacent core segments 20 close to the magnetic gap portion G fit tightly with each other or make the second surfaces 22 of adjacent core segments 20 close to the magnetic gap portion G fit tightly with each other. Thereby, it is possible to suppress the cogging effect and fluctuation caused by the gap between the core segments 20. In addition, the core segments 20 can be assembled with high precision.

[0056] In addition, in the rotor 2, the fourth surface (pin press-fitting surface) 24 is a constituent surface other than the fifth surface (farthest surface) 25, and the direction nP of the normal line is preferably the direction between the direction n1 of the normal line of the first surface 21 and the direction n2 of the normal line of the second surface 22.

[0057] According to the rotor 2 like this, since the direction nP of the normal line of the fourth surface (pin press-fitting surface) 24 faces the direction between the direction n1 of the normal line of the first surface 21 and the direction n2 of the normal line of the second surface 22, it is possible to make the first surfaces 21 of adjacent core segments 20 close to the magnetic gap portion G fit tightly with each other and make the second surfaces 22 of adjacent core segments 20 close to the magnetic gap portion G fit tightly with each other. Thereby, it is possible to further suppress the cogging effect and fluctuation caused by the gap between the core segments 20. In addition, the core segments 20 can be assembled with higher precision.

[0058] [Third Embodiment]

[0059] Next, use Figure 5 , to describe the structure of the stator 3 and the motor (reference numerals omitted) of the third embodiment. Figure 5 is a partial cross-sectional view showing the stator 3.

[0060] Figure 5 The stator 3 shown together with a rotor (not shown) disposed on the radially inner side DR2 ( Figure 5 the lower side in) of the stator 3 constitutes a motor (reference numerals omitted). Specifically, the stator 3 includes a plurality of core segments 30, a plurality of pins P, and a plurality of coils (not shown), etc.

[0061] The plurality of core segments 30 are divided from each other at the dividing surfaces 300 that extend along the axial direction ( Figure 5 the direction passing through the paper surface in) and face each other. The plurality of core segments 30 have a structure that fits together by sliding along the axial direction.

[0062] The dividing surface 300 is composed of eight component surfaces 31, 32, 33, 34, 35, 36, 37, and 38 that extend along the axial direction. The first surface 31, which is the first component surface, is closest to the magnetic gap portion G (radial inner side DR2), which is the gap between the stator 3 and the rotor (not shown). The second surface 32, which is the second component surface, is a surface continuous with the first surface 31 and is the second closest to the magnetic gap portion G after the first surface 31. The third surface 33, which is the third component surface, is a surface continuous with the second surface 32 and is the third closest to the magnetic gap portion G after the second surface 32. The fourth surface 34, which is the fourth component surface, is a surface continuous with the third surface 33 and is the fourth closest to the magnetic gap portion G after the third surface 33.

[0063] The fifth surface 35, which is the fifth component surface, is a surface continuous with the fourth surface 34 and is the fifth closest to the magnetic gap portion G after the fourth surface 34. The sixth surface 36, which is the sixth component surface, is the sixth closest to the magnetic gap portion G after the fifth surface 35. The seventh surface 37, which is the seventh component surface, is the seventh closest to the magnetic gap portion G after the sixth surface 36. The seventh surface constitutes a pin press-fitting surface provided with a notch portion 37a that extends along the axial direction and has a substantially semicircular cross-section. The notch portions 37a provided in the adjacent core segments 30 and facing each other form a pin press-fitting hole that extends along the axial direction and has a substantially circular (unclosed circular) cross-section. The eighth surface 38, which is the eighth component surface, is a surface continuous with the seventh surface 37 and constitutes the "farthest surface" that is the farthest from the magnetic gap portion G.

[0064] In the adjacent core segments 30, the opposing eighth surfaces (farthest surfaces) 38 are fixed by welding W.

[0065] A plurality of pins P are respectively press-fitted into the pin press-fitting holes. The pin press-fitting holes are formed by the notch portions 37a provided in the adjacent core segments 30 and facing each other.

[0066] Next, use Figure 6 , to explain the direction nP of the normal line of the seventh surface (pin press-fitting surface) 37 of the stator 3. Figure 6 It is a schematic diagram for explaining the direction nP of the normal line of the seventh surface (pin press-fitting surface) 37 of the stator 3.

[0067] Figure 6 It is a schematic diagram showing the hypothetical overlap of the first surface 31, the second surface 32, and the seventh surface (pin press-fitting surface) 37. In Figure 6In [the figure], the direction outside the plane of the first surface 31 is represented by a first shading (shading indicated by diagonal lines from the upper right to the lower left), and the direction of the normal line of the first surface 31 is represented by an arrow n1. Also, the direction outside the plane of the second surface 32 is represented by a second shading (shading indicated by diagonal lines from the upper left to the lower right), and the direction of the normal line of the second surface 32 is represented by an arrow n2. Additionally, the direction of the normal line of the seventh surface (pin press-fitting surface) 37 is represented by an arrow nP. Furthermore, the direction that is both outside the plane of the first surface 31 and outside the plane of the second surface 32 is represented by a shading (crossed shading) obtained by overlapping both the first shading and the second shading.

[0068] As Figure 6 shown, the direction nP of the normal line of the seventh surface (pin press-fitting surface) 37 faces the direction outside the plane of the first surface 31 and also faces the direction outside the plane of the second surface 32. Additionally, the direction nP of the normal line of the seventh surface (pin press-fitting surface) 37 faces the direction between the direction n1 of the normal line of the first surface 31 and the direction n2 of the normal line of the second surface 32.

[0069] In this way, a plurality of core segments 30 are divided from each other at a dividing surface 300, and the dividing surface 300 is composed of four or more constituent surfaces 31, 32, 33, 34, 35, 36, 37, 38 that extend along the axial direction and include the first surface 31 closest to the magnetic gap portion G, the second surface 32 that is next to the first surface 31 and closer to the magnetic gap portion G, and the eighth surface (farthest surface) 38 that is the farthest from the magnetic gap portion G. The seventh surface (pin press-fitting surface) 37 is one of the constituent surfaces other than the first surface 31 and the second surface 32, and is a surface whose normal line direction nP faces the direction outside the plane of the first surface 31 or the direction outside the plane of the second surface 32. A plurality of pins P are press-fitted into pin press-fitting holes formed by notch portions 37a that are respectively provided in adjacent core segments 30 and face each other.

[0070] According to such a stator 3, since the direction nP of the normal line of the seventh surface (pin press-fitting surface) 37 faces the direction outside the plane of the first surface 31 or the direction outside the plane of the second surface 32, it is possible to make the first surfaces 31 of adjacent core segments 30 that are close to the magnetic gap portion G fit tightly with each other or make the second surfaces 32 of adjacent core segments 30 that are close to the magnetic gap portion G fit tightly with each other. Thereby, it is possible to suppress the cogging effect and fluctuations caused by the gap between the core segments 30. Additionally, the core segments 30 can be assembled with high precision.

[0071] Moreover, in the stator 3, the seventh surface (pin press-fitting surface) 37 is a constituent surface other than the eighth surface (farthest surface) 38, and the direction nP of the normal line preferably faces the direction between the direction n1 of the normal line of the first surface 31 and the direction n2 of the normal line of the second surface 32.

[0072] According to the stator 3 like this, since the direction nP of the normal line of the seventh surface (pin press-fitting surface) 37 faces the direction between the direction n1 of the normal line of the first surface 31 and the direction n2 of the normal line of the second surface 32, it is possible to make the first surfaces 31 of the adjacent core segments 30 close to the magnetic gap portion G fit tightly with each other and make the second surfaces 32 of the adjacent core segments 30 close to the magnetic gap portion G fit tightly with each other. Thereby, it is possible to further suppress the cogging effect and the ripple caused by the gap between the core segments 30. In addition, the core segments 30 can be assembled with higher precision.

[0073] In addition, in the adjacent core segments 30 of the stator 3, the eighth surfaces (farthest surfaces) 38 facing each other are preferably fixed by welding W.

[0074] According to the stator 3 like this, since the opposite eighth surfaces (farthest surfaces) 38 of the adjacent core segments 30 are fixed by welding W, the rigidity can be improved.

[0075] [Fourth Embodiment]

[0076] Next, use Figure 7 , to describe the structure of the stator 4 and the motor (reference numerals omitted) of the fourth embodiment. Figure 7 It is a partial cross-sectional view showing the stator 4.

[0077] Figure 7 The shown stator 4 and a rotor (not shown) disposed on the radially inner side DR2 ( Figure 7 the lower side in) of the stator 4 together constitute a motor (reference numerals omitted). Specifically, the stator 4 includes a plurality of core segments 40, a plurality of pins P, and a plurality of coils (not shown), etc.

[0078] The plurality of core segments 40 are divided from each other at the dividing surfaces 400 that extend along the axial direction ( Figure 7 the direction penetrating the paper surface in) and face each other. The plurality of core segments 40 have a structure that fits together by sliding axially with each other.

[0079] The dividing surface 400 is composed of four constituent surfaces 41, 42, 43, and 44 extending along the axial direction. The first surface 41 as the first constituent surface is the closest to the magnetic gap portion G (radial inner side DR2) which is the gap between the stator 4 and the rotor (not shown). The second surface 42 as the second constituent surface is a surface continuous with the first surface 41 and is the second closest to the magnetic gap portion G after the first surface 41. The third surface 43 as the third constituent surface is a surface continuous with the second surface 42 and is the second closest to the magnetic gap portion G after the second surface 42. The fourth surface 44 as the fourth constituent surface is a surface continuous with the third surface 43 and forms the farthest surface that is the farthest from the magnetic gap portion G. This fourth surface 44 forms a pin press-in surface provided with a notch portion 44a extending along the axial direction and having a substantially semicircular cross section. The notch portions 44a respectively provided in adjacent core segments 40 and facing each other form a pin press-in hole extending along the axial direction and having a substantially circular (unclosed circular) cross section.

[0080] In adjacent core segments 40, the opposing fourth surfaces (farthest surfaces) 44 are fixed by welding W.

[0081] A plurality of pins P are respectively pressed into the pin press-in holes. The pin press-in holes are formed by the notch portions 44a respectively provided in adjacent core segments 40 and facing each other.

[0082] Next, use Figure 8 to explain the direction nP of the normal line of the fourth surface (pin press-in surface) 44 of the stator 4. Figure 8 It is a schematic diagram for explaining the direction nP of the normal line of the fourth surface (pin press-in surface) 44 of the stator 4.

[0083] Figure 8 It is a schematic diagram showing the first surface 41, the second surface 42, and the fourth surface (pin press-in surface) 44 hypothetically overlapped. In Figure 8 , the out-of-plane direction of the first surface 41 is represented by the first shading (shading represented by diagonal lines from the upper right to the lower left), and the direction of the normal line of the first surface 41 is represented by the arrow n1. Also, the out-of-plane direction of the second surface 42 is represented by the second shading (shading represented by diagonal lines from the upper left to the lower right), and the direction of the normal line of the second surface 42 is represented by the arrow n2. In addition, the direction of the normal line of the fourth surface (pin press-in surface) 44 is represented by the arrow nP. Furthermore, the direction that is both the out-of-plane direction of the first surface 41 and the out-of-plane direction of the second surface 42 is represented by the shading (crossed shading) obtained by overlapping both the first shading and the second shading.

[0084] As Figure 8 shown, the direction nP of the normal line of the fourth surface (pin press-in surface) 14 faces the out-of-plane direction of the second surface 42.

[0085] In this way, a plurality of core segments 40 are divided from each other at a dividing surface 400, which is composed of four or more constituent surfaces 41, 42, 43, 44 that extend along the axial direction and include three surfaces: a first surface 41 closest to the magnetic gap portion G, a second surface 42 closer to the magnetic gap portion G than the first surface 41, and a fourth surface (farthest surface) 44 farthest from the magnetic gap portion G. The fourth surface (pin press-fitting surface) 44 is one of the constituent surfaces other than the first surface 41 and the second surface 42, and is a surface whose normal direction nP faces the outside direction of the second surface 42. A plurality of pins P are press-fitted into pin press-fitting holes formed by notch portions 44a that are provided on adjacent core segments 40 and face each other.

[0086] According to the stator 4 like this, since the normal direction nP of the fourth surface (pin press-fitting surface) 44 faces the outside direction of the second surface 42, the second surfaces 42 of adjacent core segments 40 that are close to the magnetic gap portion G can be made to fit closely to each other. Thereby, it is possible to suppress the cogging effect and the ripple caused by the gap between the core segments 40. In addition, the core segments 40 can be assembled with high precision.

[0087] In addition, in adjacent core segments 40 of the stator 4, the opposing fourth surfaces (farthest surfaces) 44 are preferably fixed by welding W.

[0088] According to the stator 4 like this, since the opposing fourth surfaces (farthest surfaces) 44 of adjacent core segments 40 are fixed by welding W, the rigidity can be improved.

[0089] [The number of constituent surfaces of the dividing surface (one of them)]

[0090] Next, use Figure 9A and Figure 9B to explain the number of constituent surfaces of the dividing surfaces 500 and 600 that constitute adjacent core segments 50 and 60. The counting method of the number of constituent surfaces described here is applicable to each of the above embodiments. Figure 9A is a diagram for explaining the number of constituent surfaces of the dividing surfaces 500 and 600, and is an exploded partial cross-sectional view showing a part of the stator 5. Figure 9B is an exploded partial cross-sectional view showing a part of a stator 5A equivalent to the stator 5.

[0091] Adjacent core segments 50 and 60 are divided from each other at dividing surfaces 500 and 600 that extend along the axial direction ( Figure 9A the direction passing through the paper surface in

[0092] The dividing surface 500 is composed of five constituent surfaces 51, 52, 53, 54, 55 extending along the axial direction and two chamfered surfaces 56, 57. The direction of the normal line of the first surface 51 as the first constituent surface is indicated by an arrow n1. The chamfered surface 56 as the first chamfered surface is a surface continuous with the first surface 51. The second surface 52 as the second constituent surface is a surface continuous with the chamfered surface 56, and the direction of the normal line is indicated by an arrow n2. The third surface 53 as the third constituent surface is a surface continuous with the second surface 52, and the direction of the normal line is indicated by an arrow n3. The fourth surface 54 as the fourth constituent surface is a surface continuous with the third surface 53, and the direction of the normal line is indicated by an arrow n4. The chamfered surface 57 as the second chamfered surface is a surface continuous with the fourth surface. The fifth surface 55 as the fifth constituent surface is a surface continuous with the chamfered surface 57, and the direction of the normal line is indicated by an arrow n5.

[0093] The dividing surface 600 is composed of five constituent surfaces 61, 62, 63, 64, 65 extending along the axial direction and two chamfered surfaces 66, 67. The first surface 61 as the first constituent surface is a surface continuous with the chamfered surface 66 as the first chamfered surface, and the direction of the normal line is indicated by an arrow n1. The second surface 62 as the second constituent surface is a surface continuous with the first surface 61, and the direction of the normal line is indicated by an arrow n2. The third surface 63 as the third constituent surface is a surface continuous with the second surface 62, and the direction of the normal line is indicated by an arrow n3. The chamfered surface 67 as the second chamfered surface is a surface continuous with the third surface 63. The fourth surface 64 as the fourth constituent surface is a surface continuous with the chamfered surface 67, and the direction of the normal line is indicated by an arrow n4. The fifth surface 65 as the fifth constituent surface is a surface continuous with the fourth surface 64, and the direction of the normal line is indicated by an arrow n5.

[0094] That is, the first surface 51 of the dividing surface 500 and the first surface 61 of the dividing surface 600 have normal lines in the corresponding direction n1, and are counted (the number is calculated) as the corresponding constituent surfaces. The second surface 52 of the dividing surface 500 and the second surface 62 of the dividing surface 600 have normal lines in the corresponding direction n2, and are counted as the corresponding constituent surfaces. The third surface 53 of the dividing surface 500 and the third surface 63 of the dividing surface 600 have normal lines in the corresponding direction n3, and are counted as the corresponding constituent surfaces. The fourth surface 54 of the dividing surface 500 and the fourth surface 64 of the dividing surface 600 have normal lines in the corresponding direction n4, and are counted as the corresponding constituent surfaces. The fifth surface 55 of the dividing surface 500 and the fifth surface 65 of the dividing surface 600 have normal lines in the corresponding direction n5, and are counted as the corresponding constituent surfaces. On the other hand, the chamfered surfaces 56, 57 of the dividing surface 500 and the chamfered surfaces 66, 67 of the dividing surface 600 do not have corresponding normal lines and cannot be counted as constituent surfaces (the number cannot be calculated).

[0095] Thus, Figure 9A the stator 5 shown Figure 9Bis equivalent to the stator 5A shown. As Figure 9B shown, in the stator 5A, as a difference from the stator 5, the dividing surface 500A instead of the dividing surface 500 does not have the chamfered surfaces 56 and 57, and further, the dividing surface 600A instead of the dividing surface 600 does not have the chamfered surfaces 66 and 67. The structure of the stator 5A other than this is the same as that of the stator 5, and the description thereof is omitted by attaching the same reference numerals as those of the stator 5 to the same structures.

[0096] [Number of constituent surfaces forming the dividing surface (Part II)]

[0097] Next, Figure 10A and Figure 10B are used to describe the number of constituent surfaces of the dividing surfaces 700 and 800 that form the adjacent core segments 70 and 80. The counting method of the number of constituent surfaces described here is applicable to each of the above-described embodiments. Figure 10A is a partial exploded cross-sectional view showing the stator 7 for explaining the number of constituent surfaces of the dividing surfaces 700 and 800. Figure 10B is a partial exploded cross-sectional view showing the stator 7A equivalent to the stator 7.

[0098] The adjacent core segments 70 and 80 are separated from each other at the dividing surfaces 700 and 800 that extend along the axial direction ( Figure 10A the direction passing through the paper surface in

[0099] The dividing surface 700 includes three constituent surfaces 71, 72, and 73 that extend along the axial direction. The direction of the normal line of the first surface 71 as the first constituent surface is indicated by an arrow n1. The second surface 72 as the second constituent surface is a surface continuous with the first surface 71, and the direction of the normal line is indicated by an arrow n2. The third surface 73 as the third constituent surface is a surface continuous with the second surface 72, and the direction of the normal line is indicated by an arrow n3.

[0100] The dividing surface 800 is a curved surface that extends along the axial direction. The dividing surface 800 has an infinite number of directions, and the infinite number of directions includes the directions indicated by the arrows n1, n2, and n3.

[0101] That is, the first surface 71 of the dividing surface 700 and the dividing surface 800 have normal lines in the corresponding direction n1, and each is counted as a corresponding constituent surface. The second surface 72 of the dividing surface 700 and the dividing surface 800 have normal lines in the corresponding direction n2, and each is counted as a corresponding constituent surface. The third surface 73 of the dividing surface 700 and the dividing surface 800 have normal lines in the corresponding direction n3, and each is counted as a corresponding constituent surface.

[0102] In this way, Figure 10A the stator 7 shown is the same as Figure 10Bis equivalent to the stator 7A shown. As Figure 10B shown, in the stator 7A, as a difference from the stator 7, the dividing surface 800A instead of the dividing surface 800 includes three constituent surfaces 81, 82, and 83 along the axial direction. The direction of the normal line of the first surface 81 as the first constituent surface is indicated by an arrow n1. The second surface 82 as the second constituent surface is a surface continuous with the first surface 81, and the direction of the normal line is indicated by an arrow n2. The third surface 83 as the third constituent surface is a surface continuous with the second surface 82, and the direction of the normal line is indicated by an arrow n3. The other structures of the stator 7A are the same as those of the stator 7, and the description thereof is omitted by assigning the same reference numerals as those of the stator 7 to the same structures.

[0103] The present invention is not limited to the above-described embodiments, and various changes and modifications can be made.

[0104] For example, in Figure 7 the fourth embodiment shown, the case where the notch portion 44a is provided in the fourth surface 44 is described as an example, but it is not limited thereto. The notch portion may be provided in the third surface 43. In this case, since the direction nP of the normal line of the third surface (pin press-fitting surface) 43 faces the outside of the surface of the first surface 41, the first surfaces 41 of the adjacent core segments 40 close to the magnetic gap portion G can be brought into close contact with each other.

[0105] The rotating electric machine of the present invention is not limited to a motor, and may also be a generator.

[0106] Explanation of Reference Numerals

[0107] 1, 3, 4, 5, 5A, 7, 7A, stator; 2, rotor; 10, 20, 30, 40, 50, 60, 70, 80, core segment; 11, 21, 31, 41, 51, 61, 71, 81, first surface (constituting surface); 12, 22, 32, 42, 52, 62, 72, 82, second surface (constituting surface); 13, 23, 33, 43, 53, 63, third surface (constituting surface); 73, 83, third surface (constituting surface, farthest surface); 14, 24, fourth surface (constituting surface, pin press-in surface); 34, 54, 64, fourth surface (constituting surface); 44, fourth surface (constituting surface, pin press-in surface, farthest surface); 15, 25, 55, 65, fifth surface (constituting surface, farthest surface); 35, fifth surface (constituting surface); 36, sixth surface (constituting surface); 37, seventh surface (constituting surface, pin press-in surface); 38, eighth surface (constituting surface, farthest surface); 56, 57, 66, 67, chamfered surface; 14a, 24a, 37a, 44a, notch (pin press-in hole); 100, 200, 300, 400, 500, 500A, 600, 600A, 700, 800, 800A, dividing surface; P, pin; G, magnetic gap; W, welding; n1, direction of the normal of the first surface; n2, direction of the normal of the second surface; n3, direction of the normal of the third surface; n4, direction of the normal of the fourth surface; n5, direction of the normal of the fifth surface; nP, direction of the normal of the pin press-in surface.

Claims

1. A stator, comprising: a plurality of core segments each having a notch portion extending along an axial direction; and a plurality of pins press-fitted into pin press-fitting holes formed by the notches that are respectively provided in adjacent core segments and face each other, wherein the plurality of core segments are each divided from each other at a dividing surface formed by four or more constituent surfaces that extend along the axial direction and include three surfaces, namely, a first surface closest to a magnetic gap portion, a second surface next to the first surface and closer to the magnetic gap portion, and a farthest surface farthest from the magnetic gap portion; one of the constituent surfaces other than the first surface and the second surface is a pin press-fitting surface provided with the notch portion, and the direction of the normal line of the pin press-fitting surface faces an out-of-plane direction of the first surface and an out-of-plane direction of the second surface. As a result, the first surfaces of adjacent core segments are in close contact with each other, and the second surfaces of adjacent core segments are in close contact with each other.

2. The stator according to claim 1, wherein the pin press-fitting surface is a constituent surface other than the farthest surface, and the direction of its normal line faces a direction between the direction of the normal line of the first surface and the direction of the normal line of the second surface.

3. The stator according to claim 1 or 2, wherein in adjacent core segments, the opposing farthest surfaces are fixed by welding.

4. A rotating electrical machine, wherein, This rotating electric machine includes: the stator according to any one of claims 1 to 3; and a rotor disposed inside the stator.

5. A rotor, comprising: a plurality of core segments each having a notch portion extending along an axial direction; and a plurality of pins press-fitted into pin press-fitting holes formed by the notches that are respectively provided in adjacent core segments and face each other, wherein the plurality of core segments are each divided from each other at a dividing surface formed by four or more constituent surfaces that extend along the axial direction and include three surfaces, namely, a first surface closest to a magnetic gap portion, a second surface next to the first surface and closer to the magnetic gap portion, and a farthest surface farthest from the magnetic gap portion; one of the constituent surfaces other than the first surface and the second surface is a pin press-fitting surface provided with the notch portion, and the direction of the normal line of the pin press-fitting surface faces an out-of-plane direction of the first surface and an out-of-plane direction of the second surface. As a result, the first surfaces of adjacent core segments are in close contact with each other, and the second surfaces of adjacent core segments are in close contact with each other.

6. The rotor according to claim 5, wherein the pin press-fitting surface is a constituent surface other than the farthest surface, and the direction of its normal line faces a direction between the direction of the normal line of the first surface and the direction of the normal line of the second surface.

7. A rotating electrical machine, wherein, This rotating electric machine includes: the rotor according to claim 5 or 6; and a stator disposed outside the rotor.

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