Rotor, motor and electric equipment

Abstract

The utility model provides a rotor which comprises an annular machine shell, a rotor iron core assembly is arranged on the outer circumferential face of the machine shell, an output shaft is connected to the inner circumferential face of the machine shell through a first connecting rod, the output shaft and the machine shell are coaxially arranged, and a first channel for fluid to penetrate through is formed between the machine shell and the output shaft. According to the motor, the first channel for the fluid to pass through is formed between the first casing and the output shaft, so that in the working process of the motor, the fluid can pass through the inner side of the casing, and heat generated by the rotor iron core assembly arranged on the outer circumferential surface of the casing can be dissipated from the inner circumferential surface of the casing more quickly after being transferred to the casing; therefore, the heat dissipation effect of the rotor is improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a rotor, a motor and an electrical device. Background Art

[0002] In existing high-torque density motors, the current in the winding is large and the heat generated during the use of the motor is large, so the heat dissipation performance is required to be high. As an important output rotor of the motor, it will cause about 1%-3% heat loss of the whole machine, and most of its losses come from the eddy current loss of the permanent magnet. These heat losses will heat the permanent magnet during the operation of the motor. The most mainstream permanent magnet in the current motor is the neodymium iron boron magnet, whose magnetism will be affected by external temperature changes. When the temperature is higher than 180-200℃, the neodymium iron boron magnet will permanently lose its magnetism. Therefore, the heat dissipation of the motor is particularly important. Utility Model Content

[0003] The purpose of the present application is to provide a rotor, a motor and an electrical device having a good heat dissipation effect.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a rotor, comprising an annular casing, wherein a rotor core assembly is disposed on an outer circumferential surface of the casing, an inner circumferential surface of the casing is connected to an output shaft via a first connecting rod, the output shaft is coaxially disposed with the casing, and a first channel for fluid to pass through is formed between the casing and the output shaft.

[0006] In the above technical solution, a first channel for fluid to pass through is formed between the first casing and the output shaft, so that during the operation of the motor, the fluid can pass through the inner side of the casing. After the heat generated by the rotor core assembly arranged on the outer peripheral surface of the casing is transferred to the casing, it can be dissipated from the inner peripheral surface of the casing more quickly, thereby improving the heat dissipation effect of the rotor.

[0007] In combination with the first aspect, in some embodiments, the inner circumferential surface of the housing is provided with heat dissipation ribs for dissipating heat.

[0008] By arranging heat dissipation ribs on the inner circumference of the casing, the surface area of ​​the inner side of the casing can be increased, so as to increase the heat exchange area, thereby improving the heat dissipation effect of the rotor.

[0009] In combination with the first aspect, in some embodiments, the heat dissipation ribs extend along the axial direction of the housing to the end surface of the housing.

[0010] In the above technical solution, the heat dissipation ribs extend along the axial direction of the casing and extend to the end of the casing, so that the fluid can more easily enter the area between the two heat dissipation ribs to take away the heat of the casing from the area between the two heat dissipation ribs.

[0011] In combination with the first aspect, in some embodiments, the height of the heat dissipation rib is in the range of 2-6 mm; a groove is formed between two adjacent heat dissipation ribs, and the notch size of the groove is in the range of 1 to 1.5 times the height of the heat dissipation rib.

[0012] In combination with the first aspect, in some embodiments, the dimension of the housing in the axial direction is defined as a, and the dimension of the heat dissipation rib in the axial direction of the housing is not less than 0.9a.

[0013] In the above technical solution, in the axial direction of the casing, the size of the heat dissipation rib is not less than 0.8 times the size of the casing, so that the heat dissipation rib can better increase the heat dissipation area inside the casing.

[0014] In combination with the first aspect, in some embodiments, the first connecting rod has a first surface and a second surface extending from the output shaft toward the inner circumferential surface, and normals of the first surface and the second surface are perpendicular to the axis of the housing.

[0015] In the above technical solution, since the first connecting rod has a first surface and a second surface whose normal is perpendicular to the axis of the casing, during the rotation of the rotor, at least one of the first surface and the second surface can better promote the movement of the fluid. Since the linear velocity of the first connecting rod at one end of the casing is large, the fluid flows faster at the inner circumferential surface of the casing under the action of the connecting rod. Correspondingly, the pressure at the inner circumferential surface of the casing is smaller, and more fluid will move to the inner circumferential surface of the casing to more efficiently take away the heat of the casing, thereby improving the heat dissipation efficiency.

[0016] In combination with the first aspect, in some embodiments, the size of the housing in the axial direction is defined as a, and the size of the first surface and the second surface in the axial direction of the housing is not less than 0.2a.

[0017] In the above technical solution, in the axial direction of the casing, the size of the first surface and the second surface is not less than 0.2 times the size of the casing, so that the first surface and the second surface can better promote the movement of the fluid to make the pressure at the inner circumference of the casing lower.

[0018] In combination with the first aspect, in some embodiments, a cross-section of the first connecting rod in a radial direction perpendicular to the housing is H-shaped.

[0019] In the above technical solution, the cross section of the first connecting rod in the radial direction perpendicular to the casing is H-shaped. The first connecting rod with this cross-sectional shape has a certain structural strength and a small weight, so that the motor has a higher torque density by reducing the weight of the rotor.

[0020] In combination with the first aspect, in some embodiments, the first connecting rod includes a rib plate and side plates connected to the two side edges of the rib plate, the first surface is located on one of the side plates, the second surface is located on the other side plate, and the rib plate is provided with a through hole.

[0021] In the above technical solution, the through holes provided on the ribs can play a role in reducing weight and dissipating heat, which can further reduce the weight of the rotor and increase the heat dissipation effect of the rotor.

[0022] In combination with the first aspect, in some embodiments, the first connecting rods are distributed along the circumference of the housing; the number of the first connecting rods is 3-8.

[0023] In combination with the first aspect, in some embodiments, the difference between the radius of the outer circumferential surface of the housing and the radius of the inner circumferential surface is in the range of 0.8-0.9.

[0024] In combination with the first aspect, in some embodiments, the rotor core assembly includes a rotor core and a permanent magnet, and the permanent magnet is in contact with an outer circumferential surface of the casing.

[0025] In the above technical solution, by making the permanent magnet contact with the outer peripheral surface of the casing, the heat of the permanent magnet can be directly transferred to the casing. Since the inner peripheral surface of the casing has a good heat dissipation effect, the heat of the casing can be dissipated quickly, so that the temperature difference between the casing and the permanent magnet is large, thereby making the casing and the permanent magnet have a higher heat transfer efficiency, which is convenient for the heat dissipation of the permanent magnet.

[0026] In combination with the first aspect, in some embodiments, the outer peripheral surface of the housing is provided with baffles extending in the axial direction and distributed in the circumferential direction, and a positioning groove for arranging the permanent magnet is formed between two adjacent baffles.

[0027] In combination with the first aspect, in some embodiments, the rotor core is sleeved on the outside of the casing; and the outer circumferential surface of the rotor core is wrapped with a carbon fiber structural member.

[0028] In combination with the first aspect, in some embodiments, a positioning flange is provided on one side edge of the outer peripheral surface of the casing, and a first magnetic shielding plate is connected to the other side edge; a second magnetic shielding plate is provided between the positioning flange and the rotor core, and the first magnetic shielding plate and the second magnetic shielding plate are respectively in contact with an axial end face of the rotor core.

[0029] In combination with the first aspect, in some embodiments, the ratio of the outer diameter of the output shaft to the diameter of the inner circumferential surface of the housing is 0.2-0.8, preferably 0.2-0.4.

[0030] In the above technical solution, the ratio of the inner diameter of the casing to the outer diameter of the output shaft is within the above range, so that the first channel has a larger size in the radial direction of the casing, thereby allowing sufficient fluid to pass through the first channel.

[0031] In a second aspect, an embodiment of the present application provides a motor, comprising a stator and the rotor provided in the first aspect.

[0032] In a third aspect, an embodiment of the present application provides a motor, comprising a stator and the rotor provided in the first aspect, wherein the ratio of the outer diameter of the output shaft to the diameter of the inner circumference of the housing is in the range of 0.2-0.8, preferably in the range of 0.2-0.4. The stator is an annular structure with openings at both ends, and the rotor is arranged inside the stator; the diameter of the opening at at least one end of the stator is not less than the diameter of the inner circumference of the housing.

[0033] In the above technical solution, since the diameter of the opening at one end of the stator is not less than the diameter of the inner circumference of the casing, that is, the first channel is located inside the end opening of the stator, the fluid can smoothly enter the first channel.

[0034] In combination with the third aspect, in some embodiments, the output end of the output shaft is located outside the end of the stator, and the diameter of the opening of the stator toward the output end is not less than the diameter of the inner circumferential surface of the housing.

[0035] In combination with the third aspect, in some embodiments, one axial end of the stator includes a first end cover and a bearing seat, and a second channel for fluid to pass through is formed between the first end cover and the bearing seat; a second connecting rod is connected between the bearing seat and the first end cover, and a bearing is assembled between the bearing seat and the output shaft.

[0036] In combination with the third aspect, in some embodiments, the number of the second connecting rods is relatively prime to the number of the first connecting rods.

[0037] In the above technical solution, since the number of the first connecting rods and the number of the second connecting rods are mutually prime, resonance between the first connecting rods and the second connecting rods can be avoided, thereby avoiding affecting the stability of the motor.

[0038] In combination with the third aspect, in some embodiments, the inner diameter of the first end cover is not less than the diameter of the inner circumferential surface of the casing.

[0039] In a fourth aspect, an embodiment of the present application provides an electrical device, including the motor provided in the second aspect or the third aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A three-dimensional structural diagram of a motor provided in an embodiment of the present application;

[0042] Figure 2 A cross-sectional view of a motor provided in an embodiment of the present application;

[0043] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0044] Figure 4 A schematic diagram of the three-dimensional structure of a rotor in one direction provided by an embodiment of the present application;

[0045] Figure 5 A schematic diagram of the three-dimensional structure of the rotor provided in an embodiment of the present application in another direction;

[0046] Figure 6 A three-dimensional cross-sectional schematic diagram of a rotor provided in an embodiment of the present application;

[0047] Figure 7 for Figure 6 The enlarged view of point B in the middle;

[0048] Figure 8 A schematic longitudinal section diagram of a rotor provided in an embodiment of the present application.

[0049] Icon: 10-motor;

[0050] 100-rotor; 110-housing; 111-heat dissipation rib; 112-baffle; 113-positioning flange; 120-output shaft; 121-flange; 130-first connecting rod; 131-first surface; 132-second surface; 133-rib plate; 134-side plate; 140-first channel; 150-rotor core; 160-permanent magnet; 170-carbon fiber structural member; 181-first magnetic shielding plate; 182-second magnetic shielding plate;

[0051] 200-stator; 210-first end cover; 220-bearing seat; 230-second connecting rod; 241-first housing; 242-second housing; 250-second end cover; 261-first oil storage chamber; 262-second oil storage chamber; 270-stator core assembly; 280-second channel. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0053] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] In the description of this application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0056] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0057] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] The inventor of the present application has found that when a motor is used to drive an aircraft, the motor needs to have a higher torque density, that is, the motor can provide a higher torque per unit weight. It is not difficult to understand that in order to make the output torque of the motor higher, a larger current needs to be passed into the motor, which will correspondingly increase the heat generated by the motor.

[0059] At present, the heat dissipation of the motor is mostly achieved by immersing the stator and the rotor in oil to efficiently remove the heat generated by the stator and the rotor. However, there is no heat dissipation technology for the scenario where the motor is used to drive the aircraft to fly in the prior art.

[0060] Based on this, the present application provides a motor that can be used to drive an aircraft to fly and can achieve better heat dissipation effect in this application scenario.

[0061] The motor 10 provided in the embodiment of the present application is as follows Figure 1 and Figure 2 As shown, it includes a stator 200 and a rotor 100, wherein Figures 3 to 7 As shown, the rotor 100 includes a coaxially arranged housing 110 and an output shaft 120, the outer circumference of the housing 110 is used to set the rotor core 150 assembly, the inner circumference is connected to the output shaft 120, and a first channel 140 for fluid to pass through is formed between the housing 110 and the output shaft 120. Further, the inner circumference of the housing 110 is a cylindrical surface; the housing 110 and the output shaft 120 are connected by a first connecting rod 130, one end of the first connecting rod 130 is connected to the output shaft 120, and the other end extends to the inner circumference of the housing 110 along the radial direction of the housing 110. When the motor 10 provided in the present application is applied to an aircraft, the first channel 140 formed between the housing 110 and the output shaft 120 is used for airflow to pass through; when the motor 10 provided in the present application is applied to other fields, the first channel 140 formed between the housing 110 and the output shaft 120 can also be used for liquid fluids such as water to pass through.

[0062] It is not difficult to understand that the flight speed of the aircraft is relatively fast. During the flight of the aircraft, the fluid can pass through the first channel 140 formed between the housing 110 and the output shaft 120 at a relatively fast speed, thereby dissipating the heat of the rotor 100 of the motor 10. Similarly, when the fluid passes through the surface of the stator 200, it can also achieve a good heat dissipation effect on the stator 200.

[0063] Further, the ratio of the outer diameter of the output shaft 120 to the diameter of the inner circumference of the housing 110 is in the range of 0.2-0.8, preferably in the range of 0.2-0.4, so that the first channel 140 can have a larger size in the radial direction of the housing 110, so as to allow a sufficient amount of fluid to pass through the inner circumference of the housing 110. It should be easy for those skilled in the art to understand that the motion output by the rotor 100 in the motor 10 is rotation, that is, the motion of the output shaft 120 is rotation around the axis of the housing 110. In order to support the output shaft 120, the output shaft 120 should have a cylindrical surface for setting a bearing. The outer diameter of the output shaft 120 can be understood as the diameter of the cylindrical surface of the output shaft 120 for setting a bearing, or the cylindrical surface of the output shaft 120 for contacting other structures.

[0064] In some embodiments, the stator 200 is an annular structure with openings at both ends, and the rotor 100 is arranged on the inner side of the stator 200. The diameter of the opening at at least one end of the stator 200 is not less than the diameter of the inner circumferential surface of the casing 110, so that at least one end of the first channel 140 for fluid to pass through formed between the casing 110 and the output shaft 120 has a larger opening, so that the fluid can better enter the first channel 140 for fluid to pass through in the rotor 100, so as to have a better heat dissipation effect on the rotor 100.

[0065] Preferably, in the forward direction of the aircraft, the diameter of the opening of the stator 200 at the front end in the forward direction of the aircraft is not less than the diameter of the inner circumference of the housing 110. For example, in some embodiments, the output end of the output shaft 120 in the rotor 100 is located outside the end of the stator 200, and the diameter of the opening of the stator 200 toward the output end is not less than the diameter of the inner circumference of the housing 110. That is, in the axial direction of the stator 200, the output end of the output shaft 120 extends to the outside of the stator 200. It is not difficult to understand that the output shaft 120 of the stator 200 is used to connect to structures such as blades that can generate driving force. Under the action of structures such as blades, the airflow passes through the output shaft 120 and then passes through the first channel 140 inside the rotor 100, and takes away the heat of the rotor 100. In other embodiments, the diameter of the opening of the stator 200 facing away from the output end may also be not less than the diameter of the inner circumference of the housing 110. Furthermore, in some embodiments, a flange 121 is provided at the end of the output shaft 120 , and the output shaft 120 is connected to external structures such as blades through the flange 121 .

[0066] Of course, in other embodiments, the diameter of the openings at both ends of the stator 200 may be slightly smaller than the diameter of the inner circumferential surface of the rotor 100 .

[0067] In some embodiments, Figures 1 to 3As shown, one end of the stator 200 in the axial direction includes a first end cover 210 and a bearing seat 220, and a second channel 280 for fluid to pass through is formed between the first end cover 210 and the bearing seat 220, so that the fluid can enter the first channel 140 through the second channel 280; further, the first end cover 210 and the bearing seat 220 are coaxially arranged; further, a second connecting rod 230 is connected between the bearing seat 220 and the first end cover 210, and a bearing is assembled between the bearing seat 220 and the output shaft 120. Figure 1 and Figure 2 It is not difficult to understand that the stator 200 can play a role in supporting the rotor 100. Further, the inner diameter of the first end cover 210 is not less than the diameter of the inner circumference of the housing 110, so that the first end cover 210 does not block the first channel 140, so that the fluid can enter the first channel 140 better. In some embodiments, such as Figure 1 and Figure 2 As shown, the first end cover 210, the second connecting rod 230 and the bearing seat 220 are integrally formed. In other embodiments, the first end cover 210, the second connecting rod 230 and the bearing seat 220 can also be manufactured separately and then connected.

[0068] Further, in some embodiments, the number of the first connecting rods 130 and the number of the second connecting rods 230 are mutually prime to avoid resonance between the first connecting rods 130 and the second connecting rods 230. For example, the number of the first connecting rods 130 may be five and the number of the second connecting rods 230 may be eight; in some other embodiments, the number of the first connecting rods 130 may also be 3-8.

[0069] In some embodiments of the present application, Figure 3 As shown, the stator 200 also includes a stator core assembly 270, a second end cover 250, a first shell 241 and a second shell 242; the first shell 241, the second shell 242, the first end cover 210 and the second end cover 250 form a receiving cavity for receiving the stator 200 core; the stator 200 core can be cooled by providing a coolant in the receiving cavity.

[0070] Furthermore, the first shell 241 and the second shell 242 are both annular structures, and the diameter of the first shell 241 is smaller than the diameter of the second shell 242, that is, the first shell 241 is located inside the second shell 242. The rotor 100 is arranged inside the first shell 241; the first end cover 210 and the second end cover 250 are both connected to the first shell 241 at their inner edges and connected to the second shell 242 at their outer edges. Figures 1 to 3 It is easy to understand that after removing the first end cover 210 or the second end cover 250 , the rotor 100 can be disassembled and assembled, and the operation is very convenient.

[0071] In some embodiments, in order to facilitate the assembly and disassembly of the stator core assembly 270 and reduce the volume of the stator 200, the first housing 241 is fitted with the inner circumference of the stator core assembly 270, and the second housing 242 is fitted with the outer circumference of the stator core assembly 270. The accommodating cavity is divided into a first oil storage cavity 261 and a second oil storage cavity 262 by the stator core assembly 270. The first oil storage cavity 261 and the second oil storage cavity 262 are respectively located at one end of the stator core assembly 270 to dissipate heat from the stator core assembly 270 at both ends. Further, in some embodiments, heat dissipation ribs are also provided on the outer circumference of the second housing 242 to dissipate heat from the stator core assembly 270.

[0072] In some embodiments of the present application, the inner circumference of the housing 110 in the rotor 100 is provided with heat dissipation ribs 111 for heat dissipation, and the surface area of ​​the housing 110 facing the first channel 140 can be increased by the heat dissipation ribs 111, so as to make the heat exchange efficiency higher. Further, the height of the heat dissipation rib 111 (i.e., the maximum distance between the end of the heat dissipation rib 111 in the radial direction of the housing 110 and the inner circumference of the housing 110) is in the range of 2-6 mm, and the slot width of the groove formed between two adjacent heat dissipation ribs 111 is in the range of 1 to 1.5 times the height of the heat dissipation rib 111, so as to facilitate the airflow to enter the groove from the slot along the radial direction of the housing 110.

[0073] In some embodiments, the housing 110, the first connecting rod 130, and the output shaft 120 are integrally formed structural parts. To facilitate the processing and manufacturing of the housing 110, the extension direction of the heat dissipation rib 111 is parallel to the axial direction of the housing 110, and one end of the heat dissipation rib 111 extends to the end face of the housing 110. In some embodiments, in the axial direction of the housing 110, the size of the housing 110 is a, and the size of the heat dissipation rib 111 is not less than 0.8a, so that the heat dissipation rib 111 has a better heat dissipation effect. Since one end of the heat dissipation rib 111 extends to the end face of the housing 110, it is also convenient for the airflow to enter the groove formed between the two heat dissipation ribs 111 from the end of the groove extension direction.

[0074] The other end of the heat dissipation rib 111 in the axial direction of the housing 110 may extend to the end surface of the housing 110, or may not extend to the end surface of the other end of the housing 110. In the case where the other end of the heat dissipation rib 111 in the axial direction of the housing 110 does not extend to the end surface of the housing 110, the end of the heat dissipation rib 111 may be connected by an annular flange extending inwardly in the radial direction and arranged on the inner circumference of the housing 110. Of course, in some other embodiments, the heat dissipation rib 111 may also be a structure extending along the circumference of the housing 110 on the inner circumference of the housing 110, that is, the heat dissipation rib 111 is an annular rib arranged on the inner circumference of the housing 110.

[0075] In some embodiments of the present application, the first connecting rod 130 is evenly distributed along the inner circumference of the housing 110, and the first connecting rod 130 has a first surface 131 and a second surface 132 extending from the output shaft 120 to the inner circumference of the housing 110, and the normal directions of the first surface 131 and the second surface 132 are perpendicular to the axis of the housing 110. Figure 4 and Figure 5 It is not difficult to understand that during the rotation of the rotor 100, at least one of the first surface 131 and the second surface 132 can promote the movement of the fluid, and the linear velocity of the first surface 131 and the second surface 132 near one end of the housing 110 is large, so the movement speed of the fluid is fast, and the pressure near the inner circumference of the housing 110 is small, so that the airflow at other positions can move toward the inner circumference of the housing 110, so as to better allow the fluid to take away the heat of the rotor 100 from the inner circumference of the housing 110. Further, in order to make the first surface 131 and the second surface 132 play a better effect of generating low pressure at the inner circumference of the housing 110, in the axial direction of the housing 110, the size of the housing 110 is a, and the sizes of the first surface 131 and the second surface 132 are not less than 0.2a.

[0076] In some embodiments of the present application, Figure 8 As shown, the cross section of the first connecting rod 130 in the radial direction perpendicular to the housing 110 is H-shaped, so that the structural strength of the first connecting rod 130 meets the use requirements and the weight of the first connecting rod 130 is smaller. Figure 8 As shown, the first connecting rod 130 includes a rib plate 133, which is a plate-shaped structural member, and the two larger surfaces of the rib plate 133 are perpendicular to the axial direction of the housing 110; the first connecting rod 130 also includes two oppositely arranged side plates 134, and the two side plates 134 are respectively connected to one side edge of the rib plate 133. The first surface 131 and the second surface 132 are respectively arranged on one side plate 134. Further, a through hole is also arranged on the rib plate 133, and the through hole plays a role in further reducing weight and dissipating heat. Of course, in some other embodiments, the cross section of the first connecting rod 130 in the radial direction perpendicular to the housing 110 can also be a rectangle or other shapes.

[0077] It should be easy for those skilled in the art to understand that when the motor 10 is working, the rotor core 150 generates heat. Therefore, in some embodiments of the present application, the rotor core 150 assembly includes the rotor core 150 and the permanent magnet 160 disposed on the rotor core 150. Specifically, the rotor core 150 is disposed on the outer peripheral surface of the housing 110 and contacts the outer peripheral surface. The thickness of the housing 110 (i.e., the difference between the radius of the outer peripheral surface of the housing 110 and the radius of the inner peripheral surface of the housing 110) is within the range of 2-6 mm, so that the heat of the rotor core 150 can be dissipated faster after being transferred to the housing 110, and can be 2 mm, 3 mm, 4 mm, 5 mm and 6 mm.

[0078] The most mainstream permanent magnet 160 in the current motor 10 is a neodymium iron boron magnet, whose magnetism will be affected by external temperature changes. When the temperature is higher than 180-200°C, the neodymium iron boron magnet will permanently lose its magnetism. In order to better dissipate the heat of the permanent magnet 160, in some embodiments, the outer peripheral surface of the housing 110 is provided with a baffle 112 extending axially and distributed circumferentially, and a positioning groove for setting the permanent magnet is formed between two adjacent baffles 112, and the permanent magnet 160 is installed in the positioning groove. Further, the permanent magnet 160 is also connected to the housing 110 by bonding. By providing a baffle 112 in the housing 110 to form a positioning groove for setting the permanent magnet 160, it is easy to install the permanent magnet 160, and the permanent magnet 160 can also be directly in contact with the housing 110, so that the heat of the permanent magnet 160 is directly transferred to the housing 110 and then dissipated. In order to reduce the time for the heat of the permanent magnet 160 to be transferred to the housing 110 and dissipated while meeting the structural strength of the housing 110, in some embodiments, the distance between the inner circumference of the housing 110 and the bottom of the mounting groove is within the range of 2-6 mm. It is not difficult to understand that in this embodiment, the permanent magnet 160 contacts the housing 110 on one side in the radial direction of the housing 110 and contacts the rotor core 150 on the other side. During the rotation of the rotor 100, the silicon steel sheets in the rotor 100 will be affected by the centrifugal force and the repulsive force between the permanent magnet 160. Therefore, in some embodiments, the outer circumference of the rotor core 150 is also wrapped with a carbon fiber structural member 170 to reduce the risk of the rotor core 150 being scattered.

[0079] like Figure 7As shown, in order to facilitate the positioning of the rotor core 150 assembly in the axial direction of the housing 110, a positioning flange 113 is also provided on one side edge of the outer peripheral surface of the housing 110, and the positioning flange 113 extends toward the outer peripheral surface of the housing 110. The permanent magnet 160 inserted into the positioning groove is positioned by the positioning flange 113. It is not difficult to understand that the positioning groove can extend to the positioning flange 113. A first magnetic shielding plate 181 is connected to the other side edge of the outer peripheral surface of the housing 110. After the permanent magnet 160 is inserted into the positioning groove, the first magnetic shielding plate 181 is connected to the edge of the housing 110, so that the permanent magnet 160 can be restricted between the positioning flange 113 and the first magnetic shielding plate 181. In some embodiments, the positioning flange 113 may be an edge disposed on the outer circumferential surface of the housing 110 facing the output end of the output shaft 120; in other embodiments, the positioning flange 113 may also be an edge disposed on the outer circumferential surface of the housing 110 facing away from the output end of the output shaft 120.

[0080] In some embodiments, a second magnetic shielding plate 182 is further connected to the side of the positioning flange 113 facing the first magnetic shielding plate 181, that is, in this embodiment, during the process of loading the permanent magnet 160, the second magnetic shielding plate 182 is used to realize the axial positioning of the permanent magnet 160 in the housing 110. After the permanent magnet 160 is loaded, the first magnetic shielding plate 181 is connected to the housing 110 to confine the permanent magnet 160 between the first magnetic shielding plate 181 and the second magnetic shielding plate 182. The connection between the first magnetic shielding plate 181 and the housing 110 can be a detachable connection such as a threaded connection, for example, the first magnetic shielding plate 181 is locked on the positioning flange 113 along the axial direction of the housing 110 by screws. Further, the first magnetic shielding plate 181 and the second magnetic shielding plate 182 can be made of plastic material or other non-metallic materials. Furthermore, through holes may be provided on the first magnetic shielding plate 181 and the second magnetic shielding plate 182 to facilitate heat dissipation of the rotor core 150 from the ends and weight reduction.

[0081] In some embodiments, Figures 5 to 8 As shown, the first magnetic shielding plate 181 and the second magnetic shielding plate 182 are both annular structures, and after the first magnetic shielding plate 181 and the second magnetic shielding plate 182 are installed, the outer edges of the first magnetic shielding plate 181 and the outer edges of the second magnetic shielding plate 182 are slightly higher than the core assembly.

[0082] The present application also provides an electrical device. The electrical device described in the present application may be a flying car that requires a high torque density, or may be other equipment that includes the motor 10 provided in the present application, such as electric vehicles, power tools, ships, spacecraft, medical equipment, industrial production equipment, etc.

[0083] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor, It is characterized in that It comprises an annular casing, the outer circumference of which is provided with a rotor core assembly, the inner circumference of which is connected with an output shaft via a first connecting rod, the output shaft is coaxially arranged with the casing, and a first channel for fluid to pass through is formed between the casing and the output shaft.

2. The rotor according to claim 1, It is characterized in that The inner circumference of the housing is provided with heat dissipation ribs for dissipating heat.

3. The rotor according to claim 2, It is characterized in that The heat dissipation ribs extend along the axial direction of the housing to the end surface of the housing.

4. The rotor according to claim 3, It is characterized in that The height of the heat dissipation ribs is in the range of 2-6 mm; a groove is formed between two adjacent heat dissipation ribs, and the notch size of the groove is in the range of 1 to 1.5 times the height of the heat dissipation ribs.

5. The rotor according to claim 3, It is characterized in that The dimension of the housing in the axial direction is defined as a, and the dimension of the heat dissipation rib in the axial direction of the housing is not less than 0.9a.

6. The rotor according to claim 2, It is characterized in that The first connecting rod has a first surface and a second surface extending from the output shaft toward the inner circumferential surface, and normal directions of the first surface and the second surface are both perpendicular to the axis of the housing.

7. The rotor according to claim 6, It is characterized in that The dimension of the housing in the axial direction is defined as a, and the dimensions of the first surface and the second surface in the axial direction of the housing are not less than 0.2a.

8. The rotor according to claim 6, It is characterized in that The cross section of the first connecting rod in a radial direction perpendicular to the housing is H-shaped.

9. The rotor according to claim 8, It is characterized in that The first connecting rod includes a rib plate and side plates connected to the edges of both sides of the rib plate, the first surface is located on one of the side plates, the second surface is located on the other of the side plates, and the rib plate is provided with a through hole.

10. The rotor according to claim 1, It is characterized in that The first connecting rods are distributed along the circumference of the housing; the number of the first connecting rods is 3-8.

11. The rotor according to claim 1, It is characterized in that The difference between the radius of the outer circumferential surface of the housing and the radius of the inner circumferential surface is in the range of 2-6 mm.

12. The rotor according to claim 1, It is characterized in that The rotor core assembly includes a rotor core and a permanent magnet, and the permanent magnet is in contact with the outer peripheral surface of the casing.

13. The rotor according to claim 12, It is characterized in that The outer peripheral surface of the housing is provided with baffles extending in the axial direction and distributed in the circumference, and a positioning groove for arranging the permanent magnet is formed between two adjacent baffles.

14. The rotor according to claim 12, It is characterized in that The rotor core is sleeved on the outside of the casing; the outer peripheral surface of the rotor core is wrapped with a carbon fiber structural part.

15. The rotor according to claim 12, It is characterized in that A positioning flange is provided on one side edge of the outer peripheral surface of the casing, and a first magnetic shielding plate is connected to the other side edge; a second magnetic shielding plate is provided between the positioning flange and the rotor core, and the first magnetic shielding plate and the second magnetic shielding plate are respectively in contact with an axial end face of the rotor core.

16. A rotor according to any one of claims 1 to 15, It is characterized in that The ratio of the outer diameter of the output shaft to the diameter of the inner circumferential surface of the housing is in the range of 0.2-0.8, preferably in the range of 0.2-0.

4.

17. A motor, It is characterized in that The motor comprises a stator and a rotor as described in any one of claims 1-16.

18. A motor, It is characterized in that The motor includes a stator and the rotor according to claim 16, wherein the stator is an annular structure with openings at both ends, and the rotor is arranged inside the stator; the diameter of the opening at at least one end of the stator is not less than the diameter of the inner circumferential surface of the casing.

19. The electric machine according to claim 18, It is characterized in that The output end of the output shaft is located outside the end of the stator, and the diameter of the opening of the stator toward the output end is not less than the diameter of the inner circumferential surface of the housing.

20. The electric machine according to claim 18, It is characterized in that One axial end of the stator includes a first end cover and a bearing seat, and a second channel for fluid to pass through is formed between the first end cover and the bearing seat; a second connecting rod is connected between the bearing seat and the first end cover, and a bearing is assembled between the bearing seat and the output shaft.

21. The electric machine according to claim 20, It is characterized in that The number of the second connecting rods is relatively prime to the number of the first connecting rods.

22. The electric machine according to claim 20, It is characterized in that The inner diameter of the first end cover is not less than the diameter of the inner circumferential surface of the casing.

23. An electrical device, It is characterized in that A motor comprising any one of claims 17-22.

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