Rotor housing

Abstract

A rotor of a rotating electrical machine has a rotor housing (11) and a magnet. The rotor housing is provided with: a cylindrical part (13) that has a cylindrical shape and holds the magnet of the rotor; and an end plate section (14) which is joined to the axial end section of the cylindrical section and to which a shaft, which is a rotating shaft, is fixed. The cylindrical part and the end plate part are formed separately and are integrated by being joined to each other.

Description

[0001] Cross-reference to related applications

[0002] This application is based on Japanese Patent Application No. 2022-081042 filed on May 17, 2022, and the contents thereof are incorporated herein by reference. Technical Field

[0003] The invention relates to a rotor housing for a rotating electric machine. Background Art

[0004] As a prior art related to the rotor of a rotating electrical machine, for example, Patent Document 1 is known. Patent Document 1 describes the following structure: as a rotor, there is a first annular core, a magnet arranged on the inner circumference of the first core, and a second core fixed to the inner circumference of the first core and covering the circumferential end of the magnet from the side opposite to the first core. In addition, a structure is described in which a connecting portion connecting the first core to a rotating shaft is fixed to the axial end of the first core.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2007-159308

[0008] However, various requirements are imposed on the performance of rotating electrical machines, for example. In addition, manufacturing rotors separately to meet various requirements of rotating electrical machines may increase labor and cost. In particular, the rotor housing is a component that generates centrifugal force and vibration as it rotates, and a technology that can appropriately cope with changes in centrifugal force and vibration due to changes in performance requirements is desired. Summary of the invention

[0009] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rotor case that can appropriately cope with various needs.

[0010] The various methods disclosed in this specification use different technical means to achieve various purposes. The purposes, features and effects disclosed in this specification will become more apparent by referring to the following detailed description and the attached drawings.

[0011] A first aspect is a rotor housing for a rotor of a rotating electrical machine, comprising:

[0012] a cylindrical portion having a cylindrical shape and holding a magnet of the rotor; and

[0013] an end plate portion, which is joined to an axial end portion of the cylindrical portion and to which a shaft serving as a rotation axis is fixed,

[0014] The cylindrical portion and the end plate portion are formed separately and are integrated by being joined to each other.

[0015] In the rotor, the cylindrical portion holding the magnet and the end plate portion to which the shaft serving as the rotating shaft is fixed are provided as an integral body. However, if the performance requirements and uses of the rotating electrical machine are different, the performance required of the cylindrical portion and the end plate portion will be different. In this regard, since the cylindrical portion and the end plate portion are formed separately and integrated by being joined to each other, it is easy to cope with changes in the performance requirements and uses of the rotating electrical machine. As a result, a rotor housing that can appropriately cope with various requirements can be realized.

[0016] In the second aspect, the cylindrical portion and the end plate portion are integrated in a state where a joint portion on the cylindrical portion side and a joint portion on the end plate portion side are fitted with each other in the radial direction.

[0017] The cylindrical portion and the end plate portion are integrated in a state where the joint portion on the cylindrical portion side and the joint portion on the end plate portion side are fitted with each other in the radial direction. In this case, the coaxial accuracy of the cylindrical portion and the end plate portion is improved.

[0018] In method 3, the rotor housing has the magnet mounted radially inside the cylindrical portion, and the cylindrical portion and the end plate portion are joined to each other with the joining portion on the cylindrical portion side being located radially outside and the joining portion on the end plate portion side being located radially inside.

[0019] The cylindrical portion and the end plate portion are joined to each other in a state where the joint portion on the cylindrical portion side is located radially outward and the joint portion on the end plate portion side is located radially inward. In this case, in the rotor, the axial end face of the end plate portion joined to the radial inner side of the cylindrical portion is opposite to the axial end face of the magnet. Thus, the magnet can be positioned in the axial direction by the end plate portion.

[0020] In method 4, the rotor housing has the magnet mounted radially inside the cylindrical portion, and the cylindrical portion and the end plate portion are joined to each other with the joining portion on the cylindrical portion side being located radially inside and the joining portion on the end plate portion side being located radially outside.

[0021] Since the cylindrical portion and the end plate portion are joined to each other with the joining portion on the cylindrical portion side being located radially inward and the joining portion on the end plate portion side being located radially outward, when centrifugal force is applied to the cylindrical portion holding the magnet during rotation of the rotor, the centrifugal force can be properly supported by the end plate portion radially outward of the cylindrical portion.

[0022] In method 5, the end plate portion has an annular ring portion extending in the axial direction, the cylindrical portion has an extension portion extending radially inward at the axial end of the cylindrical portion, and a annular interlocking portion extending in the axial direction is provided at the radial end of the extension portion. The cylindrical portion and the end plate portion are interlocked so that the interlocking portion serving as the joining portion on the cylindrical portion side is located radially inward, and the annular portion serving as the joining portion on the end plate portion side is located radially outward.

[0023] In the above structure, the cylindrical portion and the end plate portion are engaged with the fitting portion as the joining portion on the cylindrical portion side located radially inside and the annular portion as the joining portion on the end plate portion side located radially outside, thereby further improving the coaxial accuracy of the cylindrical portion and the end plate portion.

[0024] In method 6, the end plate portion overlaps the cylindrical portion and the magnet in the radial direction in a state where the cylindrical portion and the end plate portion overlap each other with the joining portion on the cylindrical portion side being located radially inside and the joining portion on the end plate portion side being located radially outside.

[0025] According to the above configuration, the engaging portion of the end plate overlaps with the engaging portion of the cylindrical portion in the radial direction and also overlaps with the magnet on the inner circumferential side of the cylindrical portion. Therefore, when the rotor rotates, the centrifugal force of the magnet is appropriately supported by the end plate.

[0026] In aspect 7, the cylindrical portion is formed of a magnetic material, and the end plate portion is formed of a non-magnetic material that is lighter than the cylindrical portion.

[0027] According to the above configuration, by making the cylindrical portion necessary for the magnetic circuit a magnetic body and making the end plate portion a lightweight non-magnetic body (for example, aluminum), it is possible to achieve weight reduction while ensuring an appropriate rotor function.

[0028] In method 8, in the cylindrical portion, a cylindrical extension portion extending axially outward relative to the magnet configuration area is provided at the end portion axially opposite to the end plate portion, and the cylindrical portion and the cylindrical extension portion are formed separately and integrated by mutual bonding.

[0029] In the above structure, in the rotor case, a cylindrical extension is provided separately from the cylindrical portion, and the cylindrical extension is joined to the axial end of the cylindrical portion. In this case, in the rotor case, even if the form of the parts mounted on the end portion on the axially opposite side to the end plate portion is appropriately changed, the change can be appropriately handled.

[0030] In mode 9, the end plate portion includes a circular plate portion extending in a direction perpendicular to the axial direction and a shaft fixing portion provided on the radial center side of the circular plate portion and fixing the shaft, and the circular plate portion and the shaft fixing portion are separately formed and integrated by mutual bonding.

[0031] In the above structure, the end plate portion of the rotor housing has a circular plate portion extending in a direction orthogonal to the axial direction and a shaft fixing portion provided on the radial center side of the circular plate portion, and these circular plate portions and the shaft fixing portion are engaged with each other. In this case, even if the shape of the shaft fixed to the end plate portion is appropriately changed, the change can be appropriately coped with.

[0032] In aspect 10, the thickness dimensions of the cylindrical portion and the end plate portion are different from each other, and the thickness dimension of the cylindrical portion is larger than the thickness dimension of the end plate portion.

[0033] In the structure in which the cylindrical part and the end plate part are separately formed in the rotor housing, the thickness dimensions of the cylindrical part and the end plate part can be easily made different. Since the thickness dimension of the cylindrical part is made larger than the thickness dimension of the end plate part, it is possible to appropriately cope with the case where the centrifugal force strength requirement of the rotor is high in the rotating electrical machine, for example. In addition, since the thickness dimension of the rotor housing is increased only at the necessary parts, it is possible to suppress the increase in size and weight of the rotor.

[0034] In aspect 11, the cylindrical portion and the end plate portion have different thicknesses, and the end plate portion has a thickness greater than that of the cylindrical portion.

[0035] Since the thickness dimension of the end plate portion is larger than the thickness dimension of the cylindrical portion, it is possible to appropriately cope with a case where, for example, large vibration is generated around the shaft (rotation axis) in the rotating electrical machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings.

[0037] Figure 1 It is a perspective view showing the outline of a rotor.

[0038] Figure 2 It is a longitudinal cross-sectional view of the rotor.

[0039] Figure 3 This is an exploded sectional view of the rotor housing.

[0040] Figure 4 It is a cross-sectional view showing the structure of the joint between the cylindrical portion and the end plate portion.

[0041] Figure 5 It is a cross-sectional view showing the structure of the joint between the cylindrical portion and the end plate portion.

[0042] Figure 6 It is a cross-sectional view showing the structure of the joint portion between the cylindrical portion and the enlarged diameter portion.

[0043] Figure 7 It is a longitudinal cross-sectional view of the rotor.

[0044] Figure 8 It is a longitudinal sectional view of the rotor housing.

[0045] Fig. 9 It is a longitudinal sectional view of the rotor housing. DETAILED DESCRIPTION

[0046] The following is an explanation of the embodiment based on the accompanying drawings. The rotating electric machine is used, for example, as an electric device mounted on a vehicle. However, the rotating electric machine can be widely used for industrial use, for ships, for aircraft, for home appliances, for OA equipment, for game consoles, etc. The rotating electric machine involved in this embodiment is an outer rotor type surface magnet type motor, which has a rotor and a stator as is well known. The rotor and the stator are arranged in a manner opposite to each other in the radial direction, and the rotor can rotate with respect to the stator around the rotating axis.

[0047] Figure 1 (a) and (b) are perspective views showing the outline of the rotor 10. Figure 2 is a longitudinal sectional view of the rotor 10. Figure 1 , Figure 2 In the figure, the extending direction of the rotation axis of the rotor 10 (the up-down direction in the figure) is the axial direction, the direction radially extending from the center of the rotation axis is the radial direction, and the direction circumferentially extending around the rotation axis is the circumferential direction.

[0048] The rotor 10 has a rotor housing 11 in a substantially cylindrical cup shape and an annular magnet unit 12 fixed to the rotor housing 11. The rotor housing 11 has a cylindrical portion 13 in a cylindrical shape, an end plate portion 14 provided at one axial end side of the cylindrical portion 13, and an expanded diameter portion 15 provided at the other axial end side of the cylindrical portion 13 and having a larger diameter than the cylindrical portion 13.

[0049] A magnet unit 12 is fixed to the radial inner side of the cylindrical portion 13. The other axial end side of the rotor housing 11 is open. The magnet unit 12 is composed of a plurality of magnets arranged in a manner that the polarity changes alternately along the circumferential direction of the rotor 10. Thus, the magnet unit 12 has a plurality of magnetic poles in the circumferential direction. The magnets can be arranged in a divided manner for each magnetic pole and arranged in a manner that the circumferential side surfaces are opposite to each other. The cylindrical portion 13 functions as a magnet holding component.

[0050] A shaft 21, which is the rotation center of the rotor 10, is fixed to the end plate 14. Specifically, the end plate 14 has a hole 22 in the radial center, and a plurality of fastened portions 24 are provided around the hole 22 to fasten fasteners 23 such as bolts for fixing the shaft. The fastened portions 24 may be composed of a through hole that penetrates the end plate 14 in the plate thickness direction and a nut (welded nut) fixed to the plate surface of the end plate 14. The shaft 21 is fixed to the end plate 14 by the fasteners 23 while being inserted into the hole 22. In addition, a structure may be adopted in which a stationary portion such as a ball bearing and a rotating portion of a rotating portion are fixed to the end plate 14, and the shaft 21 is fixed to the rotating portion.

[0051] The end plate 14 and the expanded diameter portion 15 are located axially outside the arrangement area of ​​the magnet unit 12 in the rotor housing 11. The expanded diameter portion 15 corresponds to a "cylindrical extension portion". A closing plate 25 for closing the open end side of the rotor housing 11 is fixed to the expanded diameter portion 15 by bolts or the like.

[0052] In the present embodiment, in the rotor housing 11 , the cylindrical portion 13 , the end plate portion 14 , and the enlarged diameter portion 15 are separately manufactured and joined to each other by welding, brazing, or other joining methods, which will be described in detail below. Figure 3 1 is an exploded cross-sectional view of the rotor housing 11 .

[0053] The cylindrical portion 13 is made of a magnetic material, for example, by bending an electromagnetic steel sheet into a cylindrical shape and joining the circumferential ends of the sheet to each other by welding or the like. However, in addition to this structure, a structure in which a plurality of electromagnetic steel sheets punched into an annular shape are stacked in the axial direction, or a structure in which stacked steel sheets extending linearly are spirally wound and stacked in the axial direction may be used as the cylindrical portion 13. When the cylindrical portion 13 is a magnetic body, the cylindrical portion 13 functions as a rotor core.

[0054] In addition, the end plate portion 14 and the expanded diameter portion 15 are made of a non-magnetic material that is lighter than the cylindrical portion 13, and are formed by, for example, stamping, forging, or casting of aluminum. By using a lightweight metal such as aluminum, the rotor 10 can be made lighter. However, at least one of the end plate portion 14 and the expanded diameter portion 15 may be formed of a magnetic material in the same manner as the cylindrical portion 13. Surface treatments for rust prevention and corrosion resistance may be appropriately applied to the cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15.

[0055] The end plate portion 14 has a circular plate portion 31 in the shape of a hollow circular plate and a joining end portion 32 extending in a circular shape from the outer peripheral edge portion of the circular plate portion 31 and joined to the cylindrical portion 13. The circular plate portion 31 is provided with the above-mentioned plurality of fastened portions 24. The joining end portion 32 extends in a circular shape in the axial direction, and accommodates the coil end portion of the stator coil on its inner peripheral side. The joining end portion 32 is equivalent to an "annular portion". The joining end portion 32 is a portion constituting the end portion on the radial outer peripheral side of the cylindrical portion 13, and the joining end portion 32 is coupled to the cylindrical portion 13 by radial interlocking. Figure 3 In the structure, the cylindrical portion 13 is located radially outside, and the joint end portion 32 of the end plate portion 14 is located radially inside, and the two are fitted together.

[0056] Its specific structure is as follows Figure 4 As shown. Figure 4 As shown, the cylindrical portion 13 and the end plate portion 14 are combined in a manner that their joint portions overlap in the radial direction. More specifically, the cylindrical portion 13 and the end plate portion 14 are assembled to each other in a manner that the joint end portion 32 of the end plate portion 14 enters the inner circumference of the cylindrical portion 13 (that is, the cylindrical portion 13 is located radially outside and the end plate portion 14 is located radially inside and assembled to each other), and the mutual joint surfaces of the two are joined by brazing or welding.

[0057] Here, the cylindrical portion 13 and the end plate portion 14 may be joined on both the outer circumferential side and the inner circumferential side of the rotor housing 11 ( Figure 4 In the direction of A1 and A2), it is carried out over the entire circumference. As a result, the strength and sealing of the rotor housing 11 can be improved. In addition, the joint portion of the cylindrical portion 13 and the end plate portion 14 can be covered by a sealing member 33 such as a liquid gasket. Therefore, even if it is assumed that the sealing is insufficient due to the joint between the cylindrical portion 13 and the end plate portion 14, the insufficient sealing can be appropriately compensated. In addition, in the case where the cylindrical portion 13 and the end plate portion 14 are made of different metals, there is a concern about the occurrence of dissimilar metal contact corrosion (galvanic corrosion), but by covering the joint portion with a sealing material 33, the occurrence of dissimilar metal contact corrosion can be suppressed.

[0058] exist Figure 4 In the structure, the axial end face of the end plate portion 14 (specifically, the axial end face of the joint end portion 32) that is joined to the radial inner side of the cylindrical portion 13 is opposite to the axial end face of the magnet unit 12. Thus, the magnet unit 12 can be positioned axially by the end plate portion 14, and a fixture or device for axially positioning the magnet unit 12 is not required.

[0059] In addition, the cylindrical portion 13 and the end plate portion 14 can also be joined by Figure 5 The structures shown in (a) to (d).

[0060] exist Figure 5 In (a), Figure 4 Similarly, the cylindrical portion 13 and the end plate portion 14 are assembled to each other in such a manner that the joint portion of the cylindrical portion 13 is located radially outward and the joint portion of the end plate portion 14 is located radially inward. Figure 4 In the difference, an annular flange 32a extending radially outward is provided at the axial end portion on the opposite side of the circular plate portion 31 in the joining end portion 32 of the end plate portion 14, and the cylindrical portion 13 and the end plate portion 14 are assembled with each other in such a way that the annular flange 32a enters the radial inner side of the cylindrical portion 13.

[0061] exist Figure 5 In (b), Figure 4 In contrast, the cylindrical portion 13 and the end plate portion 14 are assembled to each other in such a manner that the joining portion of the cylindrical portion 13 is located radially inside, and the joining portion of the end plate portion 14 is located radially outside. Specifically, at the axial end of the cylindrical portion 13, a circular annular flange 16 is provided in such a manner as to extend radially inside, and the annular flange 16 has a reduced diameter portion 16a that is reduced in diameter compared to the cylindrical portion 13. The annular flange 16 is equivalent to the "extending portion", and the reduced diameter portion 16a is equivalent to the "fitting portion". Furthermore, the joining end portion 32 of the end plate portion 14 is fitted radially outside the reduced diameter portion 16a. In short, the cylindrical portion 13 and the end plate portion 14 are joined to each other by a so-called embedded structure in such a manner that the joining portion of the cylindrical portion 13 is located radially inside, and the joining portion of the end plate portion 14 is located radially outside. As a result, the coaxial accuracy of the cylindrical portion 13 and the end plate portion 14 can be improved. Furthermore, since the cylindrical portion 13 is located radially inside and the end plate portion 14 is located radially outside, when centrifugal force is applied to the cylindrical portion 13 holding the magnet unit 12 during rotation of the rotor 10 , the centrifugal force is preferably supported by the end plate portion 14 radially outside the cylindrical portion 13 .

[0062] In addition, the annular flange 16 can be formed by, for example, stamping after the cylindrical portion 13 is manufactured. The annular flange 16 is provided in the cylindrical portion 13 at a position located axially outside the magnet fixing range where the magnet unit 12 is fixed radially inside, and the annular flange 16 is opposite to the axial end face of the magnet unit 12, so that the annular flange 16 can be used to position the magnet unit 12 in the axial direction.

[0063] exist Figure 5 In (c), Figure 5 (b) Similarly, the cylindrical portion 13 and the end plate portion 14 are assembled with each other in such a manner that the joint portion of the cylindrical portion 13 is located radially inside and the joint portion of the end plate portion 14 is located radially outside. In this structure, in particular, the joint end portion 32 of the end plate portion 14 overlaps both the cylindrical portion 13 and the magnet unit 12 in the radial direction. As a result, when the rotor 10 rotates, the centrifugal force of the magnet unit 12 is more appropriately supported by the end plate portion 14.

[0064] exist Figure 5 In (d), the cylindrical portion 13 and the end plate portion 14 are joined to each other in a state where the joint portions overlap in the axial direction. Specifically, the cylindrical portion 13 and the end plate portion 14 are joined to each other by brazing or the like in a state where the annular flange 16 on the cylindrical portion 13 side and the annular flange 32a on the end plate portion 14 side overlap in the axial direction.

[0065] The enlarged diameter portion 15 has an annular inner flange 35 and an outer flange 36, wherein the inner flange 35 serves as a joint portion with the cylindrical portion 13. Figure 3 In the structure, the cylindrical portion 13 is located radially inside, and the inner flange 35 of the enlarged diameter portion 15 is located radially outside, and the two are fitted together.

[0066] Its specific structure is as follows Figure 6 As shown. Figure 6 As shown, the cylindrical portion 13 and the enlarged diameter portion 15 are combined in a manner that their joint portions overlap in the radial direction. More specifically, the cylindrical portion 13 and the enlarged diameter portion 15 are assembled to each other in a manner that the inner flange 35 of the enlarged diameter portion 15 is fitted into the outer circumference of the cylindrical portion 13 (that is, the cylindrical portion 13 is located radially inside and the enlarged diameter portion 15 is located radially outside and assembled to each other), and the mutual joint surfaces of the two are joined by brazing or welding.

[0067] However, in the rotor 10, the magnitude of the centrifugal force and vibration generated during the operation of the rotating motor varies depending on the performance, size and other specifications of the rotating motor. For example, the magnitude of the centrifugal force generated by the rotor 10 varies depending on the assumed rotational speed of the rotating motor and the outer diameter (rotor diameter) of the rotor 10. The higher the assumed rotational speed of the rotating motor or the larger the rotor diameter, the greater the centrifugal force generated by the rotor 10. It can also be considered that the centrifugal force varies depending on the amount of magnets in the magnet unit 12 and the thickness of the magnets. In addition, for example, depending on the purpose of the rotating motor, the magnitude of the vibration generated in the shaft of the rotor 10 varies. If it is used as a driving power source in a vehicle, especially as a hub motor, the vibration is large, and if it is used in a set-type device, the vibration is relatively small.

[0068] In this regard, in the present embodiment, the thickness dimensions of the cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15 of the rotor case 11 can be selected according to the specifications such as the performance and size of the rotating electrical machine. For example, the cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15 are each made into a structure having an optimal thickness dimension, and the rotor case 11 is manufactured by integrating these structures. In addition, the materials of the cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15 can be changed according to the specifications of the rotating electrical machine, and the materials of these components can be made into materials with high Young's modulus and high tensile strength as needed.

[0069] exist Figure 7In the structure shown in (a), the thickness dimensions T1, T2, and T3 of the cylindrical portion 13, the end plate portion 14, and the enlarged diameter portion 15 are "T1>T2, T3". In this case, the thickness dimension T1 of the cylindrical portion 13 among the cylindrical portion 13, the end plate portion 14, and the enlarged diameter portion 15 is larger than the thickness dimensions T2 and T3 of the other portions. Thus, for example, it is possible to appropriately cope with the case where the strength requirement for the centrifugal force of the rotor 10 is high in the rotating electrical machine.

[0070] In addition, Figure 7 In the structure shown in (b), the respective thickness dimensions T1, T2, and T3 of the cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15 are "T1<T2, T3". In this case, the thickness dimensions T2 and T3 of the end plate portion 14 and the expanded diameter portion 15 among the cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15 are larger than the thickness dimension T1 of the cylindrical portion 13. Thus, for example, it is possible to appropriately cope with a situation where the vibration generated around the shaft in the rotating electrical machine is large. In addition, in Figure 7 In (a) and (b), the thickness dimensions T2 and T3 may be the same or different.

[0071] When manufacturing the rotor 10, the cylindrical portion 13, the end plate portion 14, and the enlarged diameter portion 15, which are components of the rotor housing 11, are respectively manufactured in advance, and these components are joined by a joining method such as brazing or welding. In this case, the joints between the components are sealed by a seal 33 as needed. Here, the materials and thickness dimensions of the cylindrical portion 13, the end plate portion 14, and the enlarged diameter portion 15 are set in an appropriate combination pattern according to the specifications of the rotating electrical machine, and these components are joined to each other on this basis.

[0072] Then, the magnet unit 12 is assembled to the rotor housing 11 by adhesive or the like. Figure 1 , Figure 2 The rotor 10 shown. After the rotor 10 is completed, the shaft 21 is fixed, integrated with the stator (not shown), the closing plate 25 is fixed, etc. In the rotor 10, the coil end portions of the stator coil are respectively accommodated on the inner circumference side of the end plate portion 14 and the inner circumference side of the expanded diameter portion 15.

[0073] According to the present embodiment described in detail above, the following excellent effects can be obtained.

[0074] In the rotor 10, the cylindrical portion 13 holding the magnet unit 12 and the end plate portion 14 to which the shaft 21 is fixed are provided as an integral body. However, if the performance requirements, uses, etc. of the rotating electrical machine are different, the performance required of the cylindrical portion 13 and the end plate portion 14 will be different. In this regard, since the cylindrical portion 13 and the end plate portion 14 are formed separately and integrated by being joined to each other, it is easy to cope with changes in the performance requirements, uses, etc. of the rotating electrical machine. As a result, it is possible to realize a rotor housing 11 that can appropriately cope with various requirements.

[0075] In addition, the cylindrical portion 13 is a magnet holding portion for holding the magnet, and the end plate portion 14 is a coil end receiving portion for receiving the coil end portion of the stator coil. Therefore, the above structure is equivalent to a structure in which the magnet holding portion and the coil end receiving portion are independently formed in the rotor housing 11 and integrated by mutual engagement.

[0076] The cylindrical portion 13 and the end plate portion 14 are integrated with each other in a state where the joint portion on the cylindrical portion 13 side and the joint portion on the end plate portion 14 side are radially fitted with each other. In this case, the coaxiality accuracy of the cylindrical portion 13 and the end plate portion 14 is improved.

[0077] The cylindrical portion 13 and the end plate portion 14 are joined to each other in a state where the joining portion on the cylindrical portion 13 side is located radially outward and the joining portion on the end plate portion 14 side is located radially inward ( Figure 4 , Figure 5 (a)). In this case, the axial end surface of the end plate portion 14 joined to the radial inner side of the cylindrical portion 13 faces the axial end surface of the magnet unit 12. Thus, the axial positioning of the magnet unit 12 can be performed by the end plate portion 14.

[0078] The cylindrical portion 13 and the end plate portion 14 are joined to each other in a state where the joining portion on the cylindrical portion 13 side is located radially inward and the joining portion on the end plate portion 14 side is located radially outward. Figure 5 (b), (c)), therefore, when centrifugal force is applied to the cylindrical portion 13 holding the magnet unit 12 during the rotation of the rotor 10, the centrifugal force can be appropriately supported by the end plate portion 14 on the radially outer side of the cylindrical portion 13.

[0079] The cylindrical portion 13 and the end plate portion 14 are fitted together in such a manner that the reduced diameter portion 16a (fitting portion) as the fitting portion on the cylindrical portion 13 side is located radially inward, and the fitting end portion 32 (annular portion) as the fitting portion on the end plate portion 14 side is located radially outward. Figure 5 Thus, the coaxial accuracy of the cylindrical portion 13 and the end plate portion 14 is further improved.

[0080] The joint portion of the end plate portion 14 overlaps with the joint portion of the cylindrical portion 13 in the radial direction, and also overlaps with the magnet unit 12 on the inner circumferential side of the cylindrical portion 13 ( Figure 5 (c)). Thus, when the rotor rotates, the centrifugal force of the magnet unit 12 is more appropriately supported by the end plate portion 14.

[0081] In the rotor case 11 , by making the cylindrical portion 13 necessary for the magnetic circuit into a magnetic body and making the end plate portion 14 into a lightweight non-magnetic body (for example, aluminum), it is possible to achieve weight reduction while ensuring the rotor function.

[0082] In the rotor case 11, the end portion of the cylindrical portion 13 on the axially opposite side to the end plate portion 14 is provided with the enlarged diameter portion 15 as a cylindrical extension portion extending axially outward from the magnet arrangement region, and the cylindrical portion 13 and the enlarged diameter portion 15 are separately formed and these components are joined to each other. Thus, in the rotor case 11, even if the form of the component attached to the end portion on the axially opposite side to the end plate portion 14 is appropriately changed, the change can be appropriately handled.

[0083] In the structure in which the cylindrical portion 13 and the end plate portion 14 are separately formed in the rotor housing 11, the thickness dimensions of the cylindrical portion 13 and the end plate portion 14 can be easily made different. Here, by making the thickness dimension of the cylindrical portion 13 larger than the thickness dimension of the end plate portion 14, it is possible to appropriately cope with the case where the strength requirement for the centrifugal force of the rotor 10 is high in the rotating electrical machine, for example. In addition, since the thickness dimension of the rotor housing 11 is increased only at necessary portions, it is possible to suppress the increase in size and weight of the rotor 10.

[0084] In the rotor case 11 , by making the thickness dimension of the end plate portion 14 larger than the thickness dimension of the cylindrical portion 13 , it is possible to appropriately cope with a situation in which, for example, large vibration is generated around the shaft in the rotating electrical machine.

[0085] (Variation Example)

[0086] like Figure 8 As shown, the end plate portion 14 of the rotor housing 11 may also include a circular plate portion 31 extending in a direction orthogonal to the axial direction and a shaft fixing portion 41 provided on the radial center side of the circular plate portion 31, and these circular plate portions 31 and the shaft fixing portion 41 are engaged with each other. A plurality of fastened portions 24 consisting of nuts (welded nuts) may be provided on the shaft fixing portion 41. The circular plate portion 31 and the shaft fixing portion 41 are formed separately and integrated by mutual engagement. In this case, even if the shape of the shaft 21 fixed to the end plate portion 14 is appropriately changed, the change can be appropriately coped with.

[0087] The cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15 of the rotor housing 11 may each have a reinforcement structure according to the strength requirements of each. For example, in the structure having a corner portion (bent portion) bent in the radial direction in the cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15 of the rotor housing 11, there is a concern that stress concentration may occur at the corner portion. In view of this, a reinforcement treatment may be performed to improve the strength of the corner portions of the cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15. For example, a work hardening treatment such as bending may be appropriately performed on the corner portions of each component.

[0088] In addition, reinforcing ribs may be provided at the corners of the cylindrical portion 13, the end plate portion 14, and the expanded diameter portion 15. Fig. 9 As shown, the end plate portion 14 may be provided with a rib 42 so as to connect the circular plate portion 31 and the joint end portion 32. The rib 42 may be formed, for example, when the end plate portion 14 is cast.

[0089] In the above-mentioned embodiments, a surface magnet type rotor is used as the rotor 10, but an embedded magnet type rotor may be used instead. In the case of an embedded magnet type rotor, a rotor core and a magnet unit composed of a plurality of magnets embedded in the rotor core may be assembled in a rotor case.

[0090] In each of the above-mentioned embodiments, the rotating electrical machine is set to an outer rotor structure, but it can also be changed to a rotating electrical machine with an inner rotor structure. In the rotating electrical machine with an inner rotor structure, the stator is arranged on the radially outer side, and the rotor is arranged on the radially inner side. In this case, in the rotor housing, the cylindrical part and the end plate part can be joined to each other in a state where the joint part on the cylindrical part side is located on the radially inner side and the joint part on the end plate part side is located on the radially outer side, as described above. Alternatively, the cylindrical part and the end plate part can be joined to each other in a state where the joint part on the cylindrical part side is located on the radially outer side and the joint part on the end plate part side is located on the radially inner side.

[0091] The invention in this specification is not limited to the illustrated embodiments. The invention includes the illustrated embodiments and variations of the embodiments by those skilled in the art. For example, the invention is not limited to the combination of parts and / or elements shown in the embodiments. The invention can be implemented in a variety of combinations. The invention can have additional parts that can be appended to the embodiments. The invention includes a structure in which parts and / or elements of the embodiments are omitted. The invention includes replacing or combining parts and / or elements between one embodiment and another. The disclosed technical scope is not limited to the description of the embodiments. Some of the disclosed technical scopes should be understood as shown by the description of the claimed scope, and also include all changes within the meaning and scope equivalent to the description of the claimed scope.

[0092] Hereinafter, technical ideas extracted from the above-mentioned embodiments will be described.

[0093] [Structure 1]

[0094] A rotor housing (11) for a rotor (10) of a rotating electrical machine, comprising:

[0095] a cylindrical portion (13) which is cylindrical and holds the magnet (12) of the rotor; and

[0096] an end plate portion (14) which is joined to the axial end of the cylindrical portion and to which a shaft (21) serving as a rotation axis is fixed,

[0097] The cylindrical portion and the end plate portion are formed separately and are integrated by being joined to each other.

[0098] [Structure 2]

[0099] According to the rotor case of configuration 1, the cylindrical portion and the end plate portion are integrated in a state where the joint portion on the cylindrical portion side and the joint portion on the end plate portion side are fitted with each other in the radial direction.

[0100] [Structure 3]

[0101] According to the rotor housing described in Structure 2,

[0102] The rotor housing is provided with the magnet on the radial inner side of the cylindrical portion.

[0103] The cylindrical portion and the end plate portion are joined to each other in a state where a joining portion on the cylindrical portion side is located radially outward and a joining portion on the end plate portion side is located radially inward.

[0104] [Structure 4]

[0105] According to the rotor housing described in Structure 2,

[0106] The rotor housing is provided with the magnet on the radial inner side of the cylindrical portion.

[0107] The cylindrical portion and the end plate portion are joined to each other in a state where a joining portion on the cylindrical portion side is located radially inward and a joining portion on the end plate portion side is located radially outward.

[0108] [Structure 5]

[0109] According to the rotor housing described in structure 4,

[0110] The end plate portion has a circular annular portion (32) extending in the axial direction.

[0111] The cylindrical portion has a protruding portion (16) protruding radially inward at an axial end of the cylindrical portion, and a circular ring-shaped fitting portion (16a) extending in the axial direction is provided at the radial end of the protruding portion.

[0112] The cylindrical portion and the end plate portion are fitted together with the fitting portion as a joining portion on the cylindrical portion side being located radially inside and the annular portion as a joining portion on the end plate portion side being located radially outside.

[0113] [Structure 6]

[0114] According to the rotor casing described in Structure 4, in a state where the cylindrical portion and the end plate portion overlap each other in a manner such that the joining portion on the cylindrical portion side is located radially inside and the joining portion on the end plate portion side is located radially outside, the end plate portion overlaps with the cylindrical portion and the magnet in the radial direction.

[0115] [Structure 7]

[0116] A rotor housing according to any one of structures 1 to 6,

[0117] The cylindrical portion is formed of a magnetic material,

[0118] The end plate portion is formed of a non-magnetic material that is lighter than the cylindrical portion.

[0119] [Structure 8]

[0120] A rotor housing according to any one of structures 1 to 7,

[0121] In the cylindrical portion, a cylindrical extension portion (15) is provided at an end portion on the axially opposite side to the end plate portion and extends axially outward relative to a region where the magnet is disposed.

[0122] The cylindrical portion and the cylindrical extension portion are formed separately and are integrated by being joined to each other.

[0123] [Structure 9]

[0124] A rotor housing according to any one of structures 1 to 8,

[0125] The end plate portion includes a circular plate portion (31) extending in a direction perpendicular to the axial direction and a shaft fixing portion (41) provided on the radial center side of the circular plate portion and fixing the shaft.

[0126] The circular plate portion and the shaft fixing portion are formed separately and are integrated by being joined to each other.

[0127] [Structure 10]

[0128] According to the rotor case described in any one of Configurations 1 to 9, the cylindrical portion and the end plate portion have different thicknesses, and the cylindrical portion has a thickness greater than that of the end plate portion.

[0129] [Structure 11]

[0130] According to the rotor case described in any one of Configurations 1 to 9, the cylindrical portion and the end plate portion have different thicknesses, and the end plate portion has a thickness greater than that of the cylindrical portion.

[0131] The present invention is described according to the embodiments, but it should be understood that the present invention is not limited to the embodiments and structures. The present invention also includes various modifications and variations within the equivalent range. In addition, various combinations and modes, and other combinations and modes including only one element among these, or including more than one element or less than multiple elements are all within the scope and thought of the present invention.

Claims

1. A rotor housing (11) for a rotor (10) of a rotating electrical machine, characterized in that: have: a cylindrical portion (13) which is cylindrical and holds the magnet (12) of the rotor; and An end plate portion (14) is joined to an axial end of the cylindrical portion and fixed with a shaft (21) serving as a rotation axis. The cylindrical portion and the end plate portion are formed separately and are integrated by being joined to each other.

2. The rotor housing according to claim 1, characterized in that The cylindrical portion and the end plate portion are integrated in a state where a joint portion on the cylindrical portion side and a joint portion on the end plate portion side are fitted with each other in a radial direction.

3. The rotor housing according to claim 2, characterized in that The rotor housing is provided with the magnet on the radial inner side of the cylindrical portion. The cylindrical portion and the end plate portion are joined to each other in a state where a joining portion on the cylindrical portion side is located radially outward and a joining portion on the end plate portion side is located radially inward.

4. The rotor housing according to claim 2, characterized in that The rotor housing is provided with the magnet on the radial inner side of the cylindrical portion. The cylindrical portion and the end plate portion are joined to each other in a state where a joining portion on the cylindrical portion side is located radially inward and a joining portion on the end plate portion side is located radially outward.

5. The rotor housing according to claim 4, characterized in that The end plate portion has a circular annular portion (32) extending in the axial direction. The cylindrical portion has a protruding portion (16) protruding radially inward at an axial end of the cylindrical portion, and a circular ring-shaped fitting portion (16a) extending in the axial direction is provided at the radial end of the protruding portion. The cylindrical portion and the end plate portion are fitted together with the fitting portion as a joining portion on the cylindrical portion side being located radially inside and the annular portion as a joining portion on the end plate portion side being located radially outside.

6. The rotor housing according to claim 4, characterized in that When the cylindrical portion and the end plate portion overlap each other with the joint portion on the cylindrical portion side located radially inside and the joint portion on the end plate portion side located radially outside, the end plate portion overlaps the cylindrical portion and the magnet in the radial direction.

7. The rotor housing according to claim 1, characterized in that The cylindrical portion is formed of a magnetic material, The end plate portion is formed of a non-magnetic material that is lighter than the cylindrical portion.

8. The rotor housing according to claim 1, characterized in that In the cylindrical portion, a cylindrical extension portion (15) is provided at an end portion on the axially opposite side to the end plate portion and extends axially outward relative to a region where the magnet is disposed. The cylindrical portion and the cylindrical extension portion are formed separately and are integrated by being joined to each other.

9. The rotor housing according to claim 1, characterized in that: The end plate portion includes a circular plate portion (31) extending in a direction perpendicular to the axial direction and a shaft fixing portion (41) provided on the radial center side of the circular plate portion and fixing the shaft. The circular plate portion and the shaft fixing portion are formed separately and are integrated by being joined to each other.

10. The rotor housing according to any one of claims 1 to 9, characterized in that The thickness dimensions of the cylindrical portion and the end plate portion are different from each other, and the thickness dimension of the cylindrical portion is larger than the thickness dimension of the end plate portion.

11. The rotor housing according to any one of claims 1 to 9, characterized in that The cylindrical portion and the end plate portion have different thicknesses, and the end plate portion has a thickness greater than that of the cylindrical portion.

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