Motor and manufacturing method of motor

Abstract

To provide a motor which can attain weight-saving and a manufacturing method of the motor.SOLUTION: A motor element 3 concerning at least one type of a plurality of types of motor elements 2, 3 is constituted by combining a plurality of split bodies 31, wherein each of the plurality of split bodies 31 comprises a solid part 31B comprising a connection surface between the plurality of split bodies and made in solid structure, at least one of the plurality of split bodies 31 comprises a light weight part 31A adjacent to the solid part 31B and made in lattice structure dispersedly including spaces, and at least one solid part 31B comprises tightening member receiving parts to which a tightening member 4 to be connected with the other motor element 2 is fitted.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a motor and a method for manufacturing a motor. [Background technology]

[0002] For example, Patent Document 1 describes the adoption of a lattice structure for the rotating body (shaft) of a motor in order to reduce the weight of the rotating body (shaft).

[0003] Here, in relation to the maximum size (e.g., a size exceeding 500 mm) that can be modeled by a modeling device (such as a 3D printer), it is conceivable to configure the motor elements that make up the motor by combining multiple divided bodies. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-57980 Summary of the Invention [Problem to be solved by the invention]

[0005] In this case, when the multiple segments are welded together, the welded parts cannot have a lattice structure that contains spaces due to the weld strength, and must have a solid structure, which inhibits weight reduction. Furthermore, when connecting to other motor elements with fastening members (for example, when integrating the housing and cover with bolts), the parts where the fastening members are attached must also have a solid structure due to the fastening strength, which also inhibits weight reduction.

[0006] Therefore, an object of the present invention is to provide a motor and a method for manufacturing the motor that can be made lighter. [Means for solving the problem]

[0007] The motor of the present invention is composed of multiple types of motor elements, and at least one of the multiple types of motor elements is composed of a combination of multiple divided bodies, each of the multiple divided bodies having a solid portion that includes the connection surfaces between the multiple divided bodies and has a solid structure, at least one of the multiple divided bodies has a lightweight portion that is adjacent to the solid portion and has a lattice structure in which space is dispersedly contained, and at least one of the solid portions has a fastening member receiving portion to which a fastening member for connecting to other motor elements is attached.

[0008] According to the present invention, the lightweight section has a lattice structure in which spaces are dispersed, thereby reducing the weight of the motor element. The solid section can combine multiple segments and also serve as a section (fastening member receiving section) to which fastening members for connecting to other motor elements are attached, allowing the solid sections to be provided in a concentrated manner, further reducing the weight.

[0009] The motor of the present invention may be a housing in which the motor element provided with the lightweight portion and the solid portion is provided around a rotor and a stator among the plurality of types of motor elements.

[0010] According to the above configuration, the weight of the housing in particular can be reduced.

[0011] Furthermore, the motor of the present invention may be configured so that the stator is positioned relative to the housing by bolting at least one axial end of the stator to an end plate fixed to the housing, and the solid portion may be configured so that a bolt for fixing a stator core in the stator can be attached via the end plate.

[0012] According to the above configuration, at least one axial end of the stator is bolted to an end plate fixed to the housing, so that the stator can be positioned relative to the housing.

[0013] The present invention also provides a method for manufacturing a motor that is composed of multiple types of motor elements, and at least one of the multiple types of motor elements is composed of a combination of multiple divided bodies, and each of the multiple divided bodies has a lightweight section with a lattice structure in which space is dispersedly contained, and a solid section adjacent to the lightweight section, including the connection surfaces between the multiple divided bodies, and having a solid structure, and at least one of the solid sections has a fastening member receiving section to which a fastening member for connecting to other motor elements is attached, and the multiple divided bodies are connected to each other by welding the solid sections, and at least one selected from a hole, a recess, and a protrusion for attaching the fastening member may be formed in the fastening member receiving section after the welding.

[0014] According to the above configuration, the lightweight portion with a lattice structure in which spaces are dispersedly contained can reduce the weight of the motor element. Furthermore, the solid portion can combine multiple segments and also serve as a portion (fastening member receiving portion) to which fastening members for connecting to other motor elements are attached. Therefore, the solid portion can be provided in a concentrated manner, further reducing the weight. Furthermore, welding the solid portion can firmly connect multiple segments together. Furthermore, at least one selected from holes, recesses, and protrusions for attaching fastening members can be easily formed after welding. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a motor and a method for manufacturing a motor that can be made lighter by having a lightweight portion with a lattice structure and a solid portion having a fastening member receiving portion to which a fastening member for connecting to other motor elements is attached. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a perspective view of a housing constituting the motor of the present invention. [Figure 2] FIG. [Figure 3]FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] 10 is a front view of a cover that constitutes the housing and has a bolt insertion hole formed therein. FIG. [Figure 5] 10 is a front view of a housing that constitutes the casing and has a screw hole formed therein into which a bolt is screwed. FIG. [Figure 6A] 5 is a front view showing one of four divided bodies that make up the cover of FIG. 4. FIG. [Figure 6B] 5 is a side view showing one of the four divided bodies that make up the cover of FIG. 4. FIG. [Figure 7A] 6 is a front view showing one of four divided bodies that make up the housing of FIG. 5. FIG. [Figure 7B] 6 is a side view showing one of four divided bodies that make up the housing of FIG. 5. FIG. [Figure 7C] 6 is a front view of a main body that constitutes the housing of FIG. 5. FIG. [Figure 8A] FIG. 5 is a front view of the cover of FIG. 4, which is composed of three divided bodies. [Figure 8B] FIG. 5 is a front view of the cover of FIG. 4, which is composed of five divided bodies. [Figure 9] FIG. 6 is a cross-sectional perspective view showing another embodiment of the housing of FIG. 5, in which a stator core is fixed to the housing via an end plate. [Figure 10] 6 is a front view showing another embodiment of the housing of FIG. 5, in which a stator core is fixed to the housing via an end plate. FIG. [Figure 11] 11 is a cross-sectional view taken along line XI-XI in FIG. [Figure 12] FIG. 2 is a perspective view of a shaft constituting the motor of the present invention. [Figure 13] FIG. [Figure 14] 14 is a cross-sectional view taken along line XIV-XIV in FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0017] The housing of the motor of the present invention, which is provided to cover the rotor and stator of the motor elements constituting the motor, is composed of multiple types of divided bodies. One embodiment of the housing will be described with reference to the drawings. The motor may be used as a drive source for an aircraft electric motor or an automobile, as a drive source for an actuator of a robot or the like, as a drive source for a pump or a compressor, as a flywheel power storage device, or for other purposes.

[0018] 1 to 3, the housing 1 is provided with three motor elements. Specifically, the housing 1 is provided with a cylindrical housing 2 and a pair of disk-shaped covers 3, 3 that cover both axial ends of the housing 2.

[0019] The covers 3, 3 are configured to have the same shape and the same size, but may be configured to have different shapes and sizes. In addition, a circular through-hole 3K is formed in the center of each of the covers 3, 3 to support a rotating shaft (not shown).

[0020] The housing 2 comprises a cylindrical main body portion 212 extending in the axial direction, and circular flange portions 211 that protrude radially outward from each of the axial ends of the main body portion 212, perpendicular to the axial direction, and have screw holes (fastening holes) 2N formed therein into which bolts 4 described below are threaded.

[0021] As shown in FIG. 2, each cover 3 is formed by welding together four cover segments 31, each having the size of one-quarter of the four equally spaced apart circumferentially, at solid cover portions (weld locations) 31B (described later). The dashed-dotted lines S1, S1 in FIG. 2 indicate the division lines. One cover segment 31 is shown in FIGS. 6A and 6B. The cover segments 31 are formed by selective laser sintering (SLS) or other methods using a laser as the heat source for a metal 3D printer, using metal powders of metal materials such as aluminum, titanium, and Inconel (registered trademark), a nickel alloy. Note that various synthetic resin materials can also be used instead of metal materials.

[0022] The cover segment 31 includes a lightweight cover portion 31A with a lattice structure in which spaces are dispersed, and a solid cover portion 31B that is adjacent to the lightweight cover portion 31A in the circumferential direction and includes a connection surface 31b between the multiple cover segments. The solid cover portion 31B has a fastener receiving portion (a part of the through-hole 3S formed after welding) for connecting to the housing 2, another motor element. The lattice structure is a structure in which lattices are periodically arranged, and by creating hollow spaces that minimize reductions in strength and rigidity, it is possible to reduce the weight of the motor element. The cross-sectional shape of the lattices that make up the lattice structure is arbitrary and may be polygonal, such as triangular or rectangular, or circular. Lattice structures also include truss structures, honeycomb structures, gyroid structures, etc. A gyroid structure is a structure in which periodic patterns are connected and has three-dimensional periodic minimal curved surfaces.

[0023] More specifically, the cover segment 31 has a sector shape, a quarter of a circle, when viewed from the front. The cover segment 31 includes the cover solid portions 31B, 31B, including the connecting surfaces 31b, 31b at both circumferential ends, and the cover lightweight portion 31A, located between the cover solid portions 31B, 31B. The cover 3 is formed by welding the four shaped cover segments 31, 31, 31 together at the cover solid portions (welding points) 31B, 31B, including the connecting surfaces 31b, 31b. Therefore, the cover solid portions (welding points) 31B, 31B are formed with a shape suitable for welding, such as a groove shape and dimensions, that are tailored to the shape. The groove shape is, for example, an X-shaped groove. In addition to groove welding, the segments may also be joined by, for example, friction stir welding or ultrasonic welding. In this case, the groove shape is substantially straight (face-to-face). The solid cover portions 31B, 31B may be integrated by a method other than the above-described grooved welding, friction stir welding, ultrasonic welding, etc. After being integrated by the above-described welding, each of the four solid cover portions 31B, 31B, 31B, 31B of the cover 3 has a through hole 3S (see FIGS. 3 and 4) formed therein for passing therethrough a bolt 4 serving as a fastening member shown in FIGS. 2 and 3.

[0024] Like the cover 3, the housing 2 is formed by welding together four housing segments 21 (see FIGS. 7A and 7B), each of which is the size of one-quarter of the total circumferential size and is divided into four equal quarters (see FIGS. 3 and 5). One housing segment 21 is shown in FIGS. 7A, 7B, and 7C. Like the cover segment 31, each housing segment 21 is formed by selective laser sintering (SLS) or other methods using a laser as the heat source for a metal 3D printer, using metal powder made of a metal material such as aluminum, titanium, or Inconel (registered trademark), a nickel alloy. Note that various synthetic resin materials can also be used instead of metal materials.

[0025] Each housing segment 21 has a lightweight housing section 21A with the aforementioned lattice structure and a solid housing section 21B that is adjacent to the lightweight housing section 21A in the circumferential direction and has a solid structure and includes connection surfaces 21b between the multiple housing segments 21, 21. Screw holes 2N corresponding to fastening member receiving portions for connecting to the cover 3, another motor element, are formed in the solid housing section 21B after the housing 2 is integrated by welding.

[0026] The housing solid portion 21B is composed of flange solid portions 211B, 211B, which will be described later, and a main body solid portion 212B, which will be described later. These three solid portions 211B, 211B, 212B are solid portions formed continuously in the axial direction. The connection surface 21b is composed of flange connection surfaces 211b, 211b, which will be described later, and a main body connection surface 212b, which will be described later. The housing lightweight portion 21A is composed of flange lightweight portions 211A, 211A, which will be described later, and a main body lightweight portion 212A, which will be described later. These three lightweight portions 211A, 211A, 212A are not formed continuously.

[0027] 7C is a front view of the housing segment 21, with the flange portion 211, described below, indicated by a two-dot chain line and the main body portion 212, described below, indicated by a solid line. As shown in FIG. 7B, the housing segment 21 includes arc-shaped flange portions 211, 211 located at both axial ends, and an arc-shaped main body portion 212 that connects the flange portions 211, 211 in the axial direction. As shown in FIG. 7A, each flange portion 211 includes flange solid portions 211B, 211B including flange connection surfaces 211b, 211b at both circumferential ends, and a flange lightweight portion 211A located between the flange solid portions 211B, 211B. 7C , the main body portion 212 includes main body solid portions 212B, 212B including main body connecting surfaces 212b, 212b at both circumferential ends, and a lightweight main body portion 212A located between the main body solid portions 212B, 212B. Furthermore, the radial dimension between the inner and outer edges of the main body portion 212 is approximately half the radial dimension of the flange portion 211, but is not limited to this. The four shaped housing segments 21, 21, 21, 21 are integrated by welding the flange solid portions 211B, 211B including the flange connecting surfaces 211b, 211b and the main body connecting surface 212b to the main body solid portion 212B.

[0028] As shown in Figures 3 and 5, each of the four flange solid portions 211B, 211B, 211B, 211B after welding has a threaded hole 2N (see Figures 3 and 5) formed therein for threading the tip of the bolt 4 passed through the through hole 3S (see Figures 3 and 4). Each threaded hole 2N is formed so as to have the same axis as the axis of the through hole 3S formed in the circumferential direction. Each of the threaded holes 2N and the through holes 3S constitutes the fastening member receiving portion to which the bolt 4 is attached for connecting the covers 3, 3 to both axial ends of the housing 2.

[0029] Currently, the size that can be manufactured as a single unit using selective laser sintering (SLS) is approximately 350mm square for general-purpose products, and at most 500mm square. Therefore, for sizes exceeding 500mm, multiple divided bodies must be manufactured and then connected by welding or fastening members (e.g., bolts).

[0030] The present invention includes a method for manufacturing a motor having a solid portion (solid portion 21B for housing, solid portion 31B for cover) in which a fastening member receiving portion (screw hole 2N, through hole 3S) is formed to which a fastening member (bolt 4) for connecting one motor element (cover 3, 3) and the other motor element (housing 2) is attached.

[0031] Specifically, eight cover segments 31 (see FIGS. 6A and 6B) each one-quarter the size are formed using a metal 3D printer. Of the eight formed cover segments 31, four of each segment are welded together at the cover solid portions 31B (welding points) of the cover segments 31 to form a pair of covers 3, 3. Next, four housing segments 21 (see FIGS. 7A and 7B) each one-quarter the size are formed using a metal 3D printer. The four formed housing segments 21 are welded together at the housing solid portions 21B (welding points) to form the housing 2. After welding, through holes 3S (see Figure 4) are formed in the outer peripheries of the four circumferential solid cover portions 31B, 31B, 31B, 31B of the pair of covers 3, 3, and screw holes 2N (see Figure 5) are formed in the outer peripheries of the four circumferential solid flange portions 211B, 211B, 211B, 211B of the housing 2, so that their axis is the same as the axis of the through holes 3S, 3S of the covers 3, 3.

[0032] In this embodiment, the screw holes 2N and the through holes 3S are formed so as to overlap the welded connection surfaces 31b, 211b, but they do not have to overlap. When forming the screw holes 2N in the solid flange portion 211B of the housing 2, the through holes 3S may be formed in the outer peripheries of the four solid cover portions 31B, 31B, 31B, 31B of each cover 3, and then the solid cover portions 31B, 31B, 31B, 31B of one cover 3 may be held facing one of the solid flange portions 211B, 211B, 211B, 211B of the housing 2, and in this state, the tip of a screw hole forming tool (for example, a tap) may be inserted into the through holes 3S, and then the screw holes 2N may be formed in the solid flange portion 211B. After forming the through holes 3S and the screw holes 2N, the tips of the eight bolts 4 are inserted into the through holes 3S and screwed into the screw holes 2N, thereby connecting the covers 3, 3 to the housing 2 and forming the enclosure 1.

[0033] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0034] For example, the housing 2 of the casing 1 may be configured as shown in Figures 9 to 11. One axial end (the left side in Figure 11) of a stator core 6 that constitutes a stator is bolted to an end plate 5 fixed to the casing 1, thereby fixing and positioning the stator core 6 to the casing 1. Note that parts not described in Figures 9 to 11 that are the same as those in Figures 1 to 7A, 7B, and 7C are given the same reference numerals and description thereof will be omitted.

[0035] Four solid housing portions 21B are formed at equal intervals in the circumferential direction on the main body 212 of the housing 2, and each has a threaded hole 21N (fastening hole; see FIGS. 9 and 11 ) into which a stator core fixing bolt 7 that fixes the stator core 6 of the stator via the end plate 5 is attached (screwed). By providing the threaded holes 21N for the stator core fixing bolts 7 that fix the end plate 5 and the threaded holes 2N for the bolts 4 that fix the covers 3, 3 in the solid housing portions 21B in this way, it is possible to increase the lattice region (lightweight housing portions 21A, described below) compared to a case in which the threaded holes 21N for the stator core fixing bolts 7 are formed in a second solid housing portion that is formed in a part of the housing 2 separate from the four solid housing portions 21B in the circumferential direction, thereby reducing the weight of the entire housing.

[0036] The housing 2 and the end plate 5 will now be described in detail. The housing 2 is formed by welding together four equally spaced housing segments 21, 21, 21, 21 in the circumferential direction at the aforementioned housing solid portions (weld portions) 21B, 21B, 21B, 21B (see FIG. 10). The aforementioned lightweight housing portion 21A (see FIG. 10), which has a lattice structure, is formed between each of the housing solid portions (weld portions) 21B. As shown in FIGS. 9 and 11, the housing 2 after being welded together includes a main body portion 212 extending in the axial direction and contacting the outer surface 6A of the cylindrical stator core 6, and flange portions 211, 211 protruding radially outward in a direction perpendicular to the axial direction from each of the axial ends of the main body portion 212.

[0037] The flange portion 211 at one axial end (left side in FIG. 11 ) of the flange portions 211, 211 is configured in a ring shape that protrudes radially outward from an outer surface 212F of the main body 212 and protrudes axially outward (left side in FIG. 11 ) beyond an end face 212T at one axial end (left side in FIG. 11 ) of the main body 212. An annular step is formed between the end face 212T at one axial end of the main body 212 and an inner surface 211C of the flange portion 211 (see FIG. 11 ). The end plate 5 is accommodated in this step. The flange portion 211 at the other axial end (right side in FIG. 11 ) of the flange portions 211, 211 is configured in a ring shape that protrudes radially outward from the outer surface 212F of the main body 212 and has a protrusion 211D that protrudes radially inward from the inner surface 212C of the main body 212. One axial end face 6B of stator core 6 abuts against axially inner end face 211E of protruding portion 211D of flange portion 211, whereby stator core 6 is positioned relative to housing 1 in the axial direction.

[0038] 11, the end plate 5 includes a ring-shaped, plate-like first plate portion 51 that can abut against an end face 212T on one axial end side of the main body portion 212, and a ring-shaped, plate-like second plate portion 52 that extends axially inward from the radially inner end of the first plate portion 51. An end face 52A of the extending direction of the second plate portion 52 abuts against an end face 6C on one axial end side of the stator core 6, pressing the stator core 6 toward the other axial end side.

[0039] The procedure for positioning and fixing the stator core 6 to the housing 1 using the end plate 5 will be described below. First, the stator core 6 is positioned so that the outer surface 6A of the cylindrical stator core 6 abuts against the inner surface 212C of the main body 212 of the housing 2, and so that the end face 6B on the other axial end side of the stator core 6 abuts against the axially inner end face 211E of the protruding portion 211D of the flange portion 211 on the other axial end side. Next, the end plate 5 is positioned on the step portion so that the end face 52A in the extending direction of the second plate portion 52 of the end plate 5 abuts against the end face 6C on one axial end side of the stator core 6. In this state, the tips of the shafts of the stator core fixing bolts 7 are passed through four through holes 5K (see FIGS. 10 and 11) formed in the end plate 5 at four locations in the circumferential direction, and then screwed into threaded holes 21N formed in the main body 212 of the housing 2. This causes the end face 52A in the extending direction of the second plate portion 52 of the end plate 5 to press the stator core 6 toward the other axial end side (the right side in FIG. 11), thereby holding the stator core 6 in a positioned state relative to the housing 2. Each of the through holes 5K and the threaded holes 21N constitutes a fastening member receiving portion for attaching the stator core fixing bolts 7. 2N shown in FIGS. 9 to 11 is a threaded hole 2N into which the bolt 4 that fixes the cover 3 shown in FIG. 5 to the housing 2 is screwed.

[0040] 11, an adhesive layer may be formed between the radial outer surface of the first plate portion 51 of the end plate 5 and the inner surface 211C of the flange portion 211 to prevent radial displacement of the end plate 5. This adhesive layer may be formed around the entire circumference of the first plate portion 51 of the end plate 5, or may be formed only in a specific portion in the circumferential direction.

[0041] In the above embodiment, the number of divisions in the circumferential direction is four, but it may be three as shown in FIG. 8A or five as shown in FIG. 8B, or any number of divisions greater than two. The fewer the number of divisions, the fewer solid portions (cover solid portions 31B in the figure) are formed to connect the divisions, thereby expanding the range of a relatively lightweight lattice structure. This contributes to weight reduction. On the other hand, conversely, the more divisions there are, the more weight can be reduced, provided that all welded portions are fastened with bolts as fastening portions and the bolt diameter is selected according to the overall axial force required for fastening. Furthermore, the more divisions there are, the shorter the pitch P (see FIG. 8B) between the bolt through holes 3S, 3S becomes, improving the strength and rigidity of the fastening portions. Figures 8A and 8B show a solid portion 31B for the cover and a lightweight portion 31A for the cover arranged between the solid portions 31B for the cover, and through holes 3S are formed in the solid portion 31B for the cover at multiple locations around the circumference of the cover 3 after welding (three locations in Figure 8A and five locations in Figure 8B).

[0042] Furthermore, in the above embodiment, when the size is such that it is not possible to print in one go using a 3D printer, multiple divided bodies are printed using a 3D printer and then the printed divided bodies are welded together to form a single body. However, even when the size is such that it is possible to print in one go using a 3D printer, multiple divided bodies may be printed using a 3D printer and then the printed divided bodies may be welded together to form a single body. Printing multiple bodies at once rather than printing them in one go can reduce printing costs, for example, because a smaller (cheaper) 3D printer can be used. Note that the more parts are printed, the more the printing costs can be reduced.

[0043] Furthermore, in the above embodiment, a lattice structure is applied to the housing 1, but as shown in Figures 12 to 14, a lattice structure may also be applied to the shaft 8 of the motor. The shaft 8 is configured by welding together four equally spaced shaft segments 811, 811, 811, 811 at four circumferentially spaced shaft solid portions (weld locations) 811B (see Figure 13). The shaft 8 after being welded together includes a shaft main body 81 having a key groove 81K formed on its outer surface into which a key (not shown) that protrudes radially inward from the inner circumferential surface of a rotor core (not shown) is fitted, and a pair of output shafts 82, 82 that extend axially outward from both axial ends of the shaft main body 81 and have a smaller diameter than the shaft main body 81.

[0044] The key groove 81K is formed as a groove extending linearly parallel to the axial direction over the entire axial area of ​​the shaft main body 81. In addition, key grooves 82K are formed on the outer surface of each output shaft 82 at four circumferential positions that are the same as the key grooves 81K on the shaft main body. The key grooves 82K are formed as grooves extending linearly parallel to the axial direction over the entire axial area of ​​the output shaft 82. A key (not shown) protruding radially inward from the inner peripheral surface of an output destination component (not shown) is fitted into the key groove 82K, and the output destination component is key-coupled (key-connected) to the output shaft 82, thereby enabling the output destination component to be securely attached to the output shaft 82 and enabling torque to be transmitted from the shaft 82 to the output destination component. In this embodiment, key grooves 81K, 82K, which are recesses recessed radially inward, are formed in the shaft main body 81 and the output shafts 82, 82 as specific structures for attaching fastening members. However, protrusions protruding radially outward, such as keys, may also be formed in the shaft main body 81 and the output shafts 82, 82, or both the recesses and the protrusions may be formed in the shaft main body 81 and the output shafts 82, 82.

[0045] The key grooves 81K of the shaft main body 81 and the key grooves 82K of each output shaft 82 are formed in solid shaft portions 811B formed at four locations in the circumferential direction (see FIGS. 13 and 14). The solid shaft portions 811B are formed continuously in the axial direction on the output shaft 82, shaft main body 81, and output shaft 82 (see FIG. 14). A lightweight shaft portion 811A (see FIGS. 13 and 14) having a lattice structure is formed between the solid shaft portions 811B, 811B formed at both circumferential ends, thereby reducing the weight of the shaft 8. Like the solid shaft portions 811B, the lightweight shaft portion 811A is also formed continuously in the axial direction on the output shaft 82, shaft main body 81, and output shaft 82. In FIGS. 12 to 14, the key grooves 81K, 82K are formed at four locations in the circumferential direction, but they may be formed at any number of locations, such as two, three, or five or more locations in the circumferential direction. In this case, the fewer the number of keyways, the larger the area of ​​the lightweight shaft portion 811A with a lattice structure, which is advantageous for reducing weight. Also, the greater the number of keyways, the stronger the shaft 8. Note that the keyways 81K of the shaft main body 81 formed in the solid shaft portion 811B constitute fastening member receiving portions to which fastening members (rotor core-side keys) for connecting to other motor elements (rotor cores) are attached.

[0046] In the above embodiment, a motor element formed by integrating multiple segments and another motor element formed by integrating multiple segments are connected with fastening members, but if one of the motor elements can be integrally formed using a 3D printer, the one integrally formed motor element and the other motor element formed by integrating multiple segments may be connected with fastening members. Note that the multiple segments do not need to have the same shape, and some (at least one) of the segments may not have a lattice structure (a solid structure).

[0047] 3 of the embodiment, the flange lightweight portions 211A, 211A provided on the flange portions 211, 211 of the housing 2 and the main body lightweight portion 212A provided on the main body portion 212 of the housing 2 are formed discontinuously, but the flange lightweight portions 211A, 211A and the main body lightweight portion 212A may be formed as a single housing lightweight portion that is formed continuously without interruption. When the lightweight portions are formed continuously in this manner, further weight reduction can be achieved.

[0048] Furthermore, in the above embodiment, a threaded hole is formed in the solid portion into which the tip of the bolt shank is screwed, but a configuration may also be adopted in which a through hole is formed in the solid portion through which the bolt shank can be inserted, and a nut is inserted through the through hole and screwed onto the tip of the bolt shank that protrudes to the outside.

[0049] Furthermore, in the above embodiment, all solid portions are provided with fastening member receiving portions, but at least one solid portion may be provided with a fastening member receiving portion. [Explanation of symbols]

[0050] 1...casing, 2...housing, 2N...screw hole (fastening member receiving portion), 3...cover, 3K...through hole, 3S...through hole (fastening member receiving portion), 4...bolt (fastening member), 5...end plate, 5K...through hole, 6...stator core, 6A...outer surface, 6B...end face, 6C...end face, 7...stator core fixing bolt, 8...shaft, 21...housing division, 21A...lightweight housing portion, 21B...solid housing portion, 21N...screw hole, 21b...connecting surface, 31...cover division, 31A...lightweight cover portion, 31B...solid cover portion (welded portion), 31b...connecting surface, 51...first plate portion, 52...second plate portion , 52A...end surface, 81...shaft main body, 81K, 82K...key groove (receiving portion for fastening member), 82...output shaft, 211...flange portion, 211A...lightweight portion for flange, 211B...solid portion for flange, 211C...inner surface, 211D...protruding portion, 211E...end surface, 211b...connecting surface for flange, 212...main body portion, 212A...lightweight portion for main body, 212B...solid portion for main body, 212C...inner surface, 212F...outer surface, 212T...end surface, 212b...connecting surface for main body, 811...shaft segment, 811A...lightweight portion for shaft, 811B...solid portion for shaft (welded portion), P...pitch, S1...dotted line

Claims

1. It is composed of multiple types of motor elements, At least one of the plurality of types of motor elements is configured by combining a plurality of divided bodies, Each of the plurality of divided bodies is a solid portion including connection surfaces between the plurality of divided bodies and having a solid structure; At least one of the plurality of divided bodies has a lightweight portion adjacent to the solid portion and having a lattice structure in which spaces are dispersedly included, At least one of the solid portions has a fastener receiving portion to which a fastener for connecting to another motor element is attached.

2. The motor according to claim 1 , wherein the motor element provided with the lightweight portion and the solid portion is a housing provided around a rotor and a stator among the plurality of types of motor elements.

3. an end plate fixed to the housing is configured to bolt at least one end of the stator in the axial direction to thereby position the stator relative to the housing; The motor according to claim 2 , wherein the solid portion is configured to receive a bolt for fixing a stator core of the stator via the end plate.

4. It is composed of multiple types of motor elements, At least one of the plurality of types of motor elements is configured by combining a plurality of divided bodies, Each of the plurality of divided bodies is A lightweight part with a lattice structure in which space is dispersedly contained, a solid portion adjacent to the lightweight portion, including connection surfaces between the plurality of divided bodies, and having a solid structure; a manufacturing method for a motor, wherein at least one of the solid portions has a fastening member receiving portion to which a fastening member for connecting to another motor element is attached, the plurality of divided bodies are connected to each other by welding the solid portions, A method for manufacturing a motor, wherein at least one selected from a hole, a recess, and a protrusion for attaching the fastening member is formed in the fastening member receiving portion after the welding.

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