Motor and its rotor

Abstract

A motor and its rotor (10), wherein the rotor (10) includes a support member (11), a magnetic permeable member (12), and a permanent magnet (13). The magnetic permeable member (12) is provided on at least one side along the axial direction of the rotor (10) of the support member (11) and is fixedly connected to the support member (11). The permanent magnet (13) is connected to the magnetic permeable member (12). The rotor (10) according to the present application has a magnetic permeable member (12) and a support member (11). The magnetic permeable member (12) increases the magnetic induction intensity, and the support member (11) provides a certain supporting effect on the magnetic permeable member (12) and the permanent magnet (13), which is advantageous for improving the output rotation speed and torque magnitude of the rotor (10) and improving the operation stability of the rotor (10). Further, by installing the support member (11) to be fixedly connected to the magnetic permeable member (12), it is advantageous to improve the connection strength between the support member (11) and the magnetic permeable member (12), and further improve the overall structural strength of the rotor (10). In the operating condition of the high-speed operation of the rotor (10), it is advantageous to reduce the risk of relative movement between the support member (11) and the magnetic permeable member (12), and further advantageous to improve the maximum rotation speed of the rotor (10) and the operation stability at high-speed operation.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically, to motors and their rotors.

Background Art

[0002] As a device that converts electrical energy into mechanical energy, motors are widely applied in electronic devices such as mobile phones, notebook computers, battery-powered vehicles, electric vehicles, electric airplanes, electric steamships, electric toy cars, electric toy steamships, electric toy airplanes, and electric tools.

[0003] In the development of motor technology, in addition to improving the performance of motors, how to improve the maximum rotational speed of motors is a continuously improving technical problem in motor technology.

Summary of the Invention

[0004] This application provides a motor and its rotor that can improve the maximum rotational speed of the motor.

[0005] According to a first aspect, an embodiment of this application provides a rotor of a motor, including a support member, a magnetic permeable member, and a permanent magnet. The magnetic permeable member is provided on at least one side along the axial direction of the rotor of the support member and is fixedly connected to the support member. The permanent magnet is connected to the magnetic permeable member.

[0006] The rotor according to the embodiment of the present application has a magnetic flux permeable member and a support member. The magnetic flux permeable member increases the magnetic induction intensity, and the support member provides a certain supporting effect on the magnetic flux permeable member and the permanent magnet, and outputs the torque and rotational speed of the rotor by the support member, which is advantageous for improving the magnitudes of the output torque and rotational speed of the rotor, and improving the operation stability of the rotor. Further, by installing the support member to be fixedly connected to the magnetic flux permeable member, it is advantageous for improving the connection strength between the support member and the magnetic flux permeable member, further improving the overall structural strength of the rotor, and reducing the risk of relative movement between the support member and the magnetic flux permeable member in the operating condition of the high-speed rotation of the rotor, and further improving the maximum rotational speed of the rotor and the structural stability at high-speed operation.

[0007] In some embodiments, the magnetic flux permeable member is welded to the support member, and / or the permanent magnet is welded to the magnetic flux permeable member. In this way, it is advantageous for further improving the connection strength between the magnetic flux permeable member and the support member, and further advantageous for improving the rotational speed of the rotor and the operation stability at high-speed operation of the rotor.

[0008] In some embodiments, one of the support member and the magnetic flux permeable member has a protrusion, and the other has a concave groove, and the protrusion fits with the concave groove. In this way, the relative positioning of the magnetic flux permeable member and the support member along the circumferential direction of the rotor can be realized, reducing the risk that the magnetic flux permeable member and the support member float along the rotational direction during the operation process of the rotor, and further improving the overall structural strength of the rotor.

[0009] In some embodiments, the plurality of protrusions extend along the radial direction of the rotor and are installed at intervals along the circumferential direction of the rotor, and the plurality of concave grooves are installed in one-to-one correspondence with the plurality of protrusions. In this way, during the process of the rotor rotating, the boss generates a circumferential position restriction on the support member and the magnetic flux permeable member, and installing the plurality of protrusions at intervals along the circumferential direction is advantageous for further reducing the risk that the support member and the magnetic flux permeable member generate relative displacement along the circumferential direction and improving the structural stability of the rotor.

[0010] In some embodiments, along the axial direction, the concave groove is installed through the support member, or along the axial direction, the concave groove is installed through the magnetic permeable member. Installing the concave groove to penetrate the support member or the magnetic permeable member along the axial direction is beneficial to improving the size of the protrusion inserted into the concave groove, improving the fitting area between the protrusion and the concave groove, and further improving the connection strength between the support member and the magnetic permeable member.

[0011] In some embodiments, the protrusion is welded to the concave groove. In this way, it is beneficial to further improve the connection strength between the support member and the magnetic permeable member, and further improve the overall structural strength of the rotor.

[0012] In some embodiments, the magnetic permeable member is annular and includes a plurality of magnetic permeable sub-members. The magnetic permeable sub-members are fan-shaped and are installed at intervals along the circumferential direction of the rotor. The permanent magnet is provided between adjacent magnetic permeable sub-members. The spoke-like arrangement of the permanent magnets is beneficial to improving the magnetic collecting ability of the entire permanent magnet, reducing the eddy current loss of the permanent magnet, and further improving the torque of the rotor and the efficiency of converting electrical energy into mechanical energy.

[0013] In some embodiments, the magnetic permeable member is annular. The magnetic permeable member has a plurality of accommodating chambers. Along the radial direction of the rotor, the accommodating chambers are installed through the magnetic permeable member. The plurality of accommodating chambers are installed at intervals along the circumferential direction of the rotor, and a permanent magnet is provided in each accommodating chamber. This is beneficial to improving the connection strength between the permanent magnet and the magnetic permeable member. It is beneficial to reducing the risk of the permanent magnet loosening relative to the magnetic permeable member, improving the magnitude of the centrifugal force that the permanent magnet can withstand, and thus beneficial to improving the rotation speed of the rotor. Also, the eddy current loss of the built-in permanent magnet is small, which is beneficial to improving the operating efficiency of the motor in the scenario where the rotor is used in a motor.

[0014] In some embodiments, the receiving chamber is in a sector-annular shape, the permanent magnet is in a sector-annular shape and conforms to the receiving chamber. In this way, it is advantageous to further improve the fitting area between the permanent magnet and the magnetic permeable member, and further improve the connection strength between the permanent magnet and the magnetic permeable member. And arranging the permanent magnet in a sector shape is advantageous for reducing the eddy current loss of the permanent magnet, and in the scenario where the rotor is used in a motor, it is advantageous for improving the efficiency of the motor.

[0015] In some embodiments, the magnetic permeable member further has a hollow groove. Along the circumferential direction of the rotor, the hollow groove is provided on at least one side of the receiving chamber. The rotor further includes a filling member, the filling member is made of a non-magnetic material and is filled in the hollow groove. With respect to the magnetic field distributed along the axial direction of the rotor generated by the stator, arranging the hollow groove can change the distribution of the magnetic field and improve the torque of the rotor. Arranging the filling member to fill the hollow groove is advantageous for maintaining the structural strength of the entire magnetic permeable member.

[0016] In some embodiments, the receiving chamber includes a first sub-chamber and a second sub-chamber that are arranged at intervals along the axial direction. The first sub-chamber is located on one side facing away from the support member of the second sub-chamber, and permanent magnets are provided in both the first sub-chamber and the second sub-chamber. Arranging in this way is advantageous for improving the sinusoidality of the air-gap magnetic field, improving the torque of the rotor, reducing torque pulsation, and improving the NVH performance of the rotor in the scenario where the rotor is used in a motor.

[0017] In some embodiments, both the first sub-chamber and the second sub-chamber are in a sector-annular shape. The central angle corresponding to the first sub-chamber is smaller than the central angle corresponding to the second sub-chamber, and the first sub-chamber installed oppositely along the axial direction overlaps with the central plane of the second sub-chamber. In this way, when the magnetic field generated by the stator penetrates the rotor along the circumferential direction of the rotor, the magnetic field lines pass through the permanent magnets in the first sub-chamber, then pass through the permanent magnets in the second sub-chamber, which is beneficial to further improve the distribution of the motor magnetic field, improve the torque, reduce the torque pulse, and improve the NVH performance of the motor.

[0018] In some embodiments, the magnetic permeable member is provided on both sides along the axial direction of the support member. The plurality of permanent magnets are connected to the magnetic permeable member. The rotor has a central plane, and the central plane is perpendicular to the axial direction. The support member, the magnetic permeable member, and the plurality of permanent magnets are respectively installed symmetrically with respect to the central plane. The permanent magnet and the magnetic permeable member are installed symmetrically with respect to the central plane. The magnitudes of the axial forces received by the permanent magnet and the magnetic permeable member that are symmetric with respect to the central plane are approximately the same, and the directions are opposite. The two can cancel each other out, and the axial force received by the entire rotor is basically zero, which is beneficial to the balance of the rotor's axial force reception.

[0019] In some embodiments, the support member includes a support ring and a support plate. The support ring is in an annular shape and extends along the axial direction. The support plate is in a plate shape and is provided at one end of the support ring along the axial direction. The magnetic permeable member is fitted into the support ring. Along the axial direction, the support ring has a first end face away from one side of the support plate, and the rotor has a second end face away from one side of the support plate. The distance between the first end face and the support plate is smaller than the distance between the second end face and the support plate. Installing in this way is beneficial to further improve the connection strength between the support member and the magnetic permeable member, and the end face of the support member is installed at a distance from the air gap interface, and the end face of the support member does not exceed the air gap interface, which is beneficial to reducing the eddy current loss generated by the support member and further improving the efficiency of the motor.

[0020] According to a second aspect, an embodiment of the present application provides a motor including a rotor of any one of the embodiments of the first aspect.

[0021] Since the motor according to the embodiment of the present application uses the rotor according to any one of the above embodiments, it has the same technical effects and will not be described further herein.

Brief Description of the Drawings

[0022] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. Based on these drawings, those skilled in the art can obtain other drawings without creative efforts.

[0023]

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[0024] In the drawings, the drawings are not drawn to actual scale.

Modes for Carrying Out the Invention

[0025] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following clearly describes the technical solutions in the embodiments of the present application while combining the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in the present application, all other embodiments obtained on the premise that those skilled in the art do not pay creative efforts all belong to the protection scope of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. In the present application, the terms used in the description of the application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The terms "including" and "having" and any variations thereof in the description of the specification, claims and the above drawings of the present application are intended to cover non-exclusive "including". The terms "first", "second", etc. in the description of the specification, claims or the above drawings of the present application are not for describing a specific order or primary-secondary relationship, but for distinguishing different objects.

[0027] As used herein, the "Examples" referred to in this application mean that the specific features, structures or characteristics described in connection with the Examples may be included in at least one Example of this application. The appearance of this phrase at each position in the specification does not necessarily refer to the same Example, nor is it an independent or alternative Example that is mutually exclusive with other Examples.

[0028] In the description of this application, unless otherwise specifically defined or limited, the terms "attachment", "connection", "connection", "attachment" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral connection. It may be a direct connection or an indirect connection through an intermediate medium, or a communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0029] The term "and / or" in this application is merely a relationship describing the related object and represents that three relationships may exist. For example, C and / or D may represent three cases: C alone, the combination of C and D, and D alone. Also, the character " / " in this application generally represents that the related objects before and after are in an "or" relationship.

[0030] In the examples of this application, the description of the same reference numeral represents the same member. And for the sake of brevity, in different examples, the detailed description of the same member is omitted. It should be understood that the thickness, size such as aspect ratio of various members in the examples of this application shown in the drawings, and the thickness, size such as aspect ratio of the entire integrated device are only illustrative descriptions and do not constitute any limitation to this application.

[0031] The "plurality" that appears in this application refers to two or more (including two).

[0032] A motor generally includes a stator and a rotor. The stator generally includes an iron core and a coil. When an electric current flows through the coil, a magnetic field can be generated. The rotor includes a permanent magnet. The permanent magnet rotates under the action of the Lorentz force in the magnetic field, thereby converting electrical energy into mechanical energy.

[0033] After discovering that with the increase in the motor rotation speed, the deterioration of its stability is remarkable and it limits the further improvement of the motor rotation speed, the inventor conducted a systematic analysis and research on the structure and operating conditions of the motor. As can be seen from the results, during the process of the motor operating, the rotor receives a relatively large centrifugal force. The rotor generally includes a magnetic permeable member and a support member that are interconnected. During the process of the rotor operating, a certain degree of relative movement occurs between the magnetic permeable member and the support member, especially in the case of high-speed operation, which limits the improvement of the rotor rotation speed.

[0034] In view of this, the inventor improved the structure of the rotor, and the technical solution described in the embodiments of the present application is applicable to the rotor and the motor using the rotor.

[0035] As shown in FIGS. 1 and 2, the embodiment of the present application provides a rotor 10 of a motor. The rotor 10 includes a support member 11, a magnetic permeable member 12, and a permanent magnet 13. The magnetic permeable member 12 is provided on at least one side of the rotor 10 of the support member 11 along the axial direction X and is fixedly connected to the support member 11. The permanent magnet 13 is connected to the magnetic permeable member 12.

[0036] The rotor 10 may include one permanent magnet 13, or a plurality of permanent magnets 13 are installed on the rotor 10. The permanent magnet 13 is in the magnetic field generated by the stator, receives the Lorentz force, generates torque on the permanent magnet 13, rotates the permanent magnet 13, and the permanent magnet 13 rotates to drive the rotation of the magnetic permeable member 12 and the support member 11.

[0037] The magnetic permeability member 12 may be made of a magnetic permeability material, such as iron, etc. The magnetic permeability member 12 is located within the magnetic field generated by the stator of the motor, can enhance the magnetic induction intensity, is advantageous for improving the torque received by the permanent magnet 13, and further improving the output torque of the motor.

[0038] The support member 11 may be made of any non-magnetic material. Exemplarily, the support member 11 may select any one of materials such as high-strength nickel alloy, stainless steel, aluminum alloy, titanium alloy, and magnesium alloy, thereby reducing the magnetic flux leakage of the rotor 10 and at the same time giving the rotor 10 relatively high strength.

[0039] The support member 11 and the magnetic permeability member 12 may exhibit any shape. Exemplarily, the support member 11 exhibits a disc shape, and the magnetic permeability member 12 exhibits a disc shape.

[0040] Optionally, the support member 11 may exhibit an integral structure, or the support member 11 may be a block-type structure. Similarly, the magnetic permeability member 12 may be an integral structure, or the magnetic permeability member 12 may be a block-type structure.

[0041] The magnetic permeability member 12 is fixedly connected to the support member 11, and the two may be a locking connection, a welding connection, a screw connection, a rivet connection, or an adhesive connection, etc., all of which can improve the connection strength between the magnetic permeability member 12 and the support member 11.

[0042] The support member 11 provides a certain supporting effect on the magnetic permeable member 12 and the permanent magnet 13. At the same time, the support member 11 is installed to be connected to the output shaft of the rotor 10, and the rotational speed and torque of the motor may be output via the output shaft. At this time, the magnetic permeable member 12 is installed to be connected to the output shaft of the rotor 10 via the support member 11, that is, while improving the magnetic induction intensity generated by the stator of the motor via the magnetic permeable member 12, the rotational speed and torque of the rotor 10 are output via the support member 11. In this way, it is advantageous to improve the torque and rotational speed of the rotor 10, and at the same time improve the stability of the torque and rotational speed output by the rotor 10.

[0043] The permanent magnet 13 is connected to the magnetic permeable member 12. The permanent magnet 13 may be connected to the surface of the magnetic permeable member 12, that is, a surface-mounted permanent magnet, or the permanent magnet 13 is installed to be connected inside the magnetic permeable member 12, that is, a built-in permanent magnet. Optionally, the permanent magnet 13 and the magnetic permeable member 12 may be connected by locking connection, welding connection, screw connection, rivet connection or adhesive connection, etc.

[0044] Optionally, the permanent magnet 13 may be arranged on the magnetic permeable member 12 in any form. Exemplarily, the permanent magnet 13 may be distributed in a spoke shape along the circumferential direction Y of the rotor 10.

[0045] Optionally, the magnetic permeable member 12 and the permanent magnet 13 may be installed on one side of the support member 11 along the axial direction X of the rotor 10, or the magnetic permeable member 12 and the permanent magnet 13 may be installed on both sides of the support member 11 along the axial direction X of the rotor 10. Here, it is not limited, and it may be selected according to actual needs.

[0046] The permanent magnet 13 may include a core. The core may be press-molded by powder metallurgy, or the core may be cured and formed after winding a viscous silicon steel sheet. The viscosity of the silicon steel sheet may be realized by dispensing at the winding time, or the silicon steel sheet itself may be set to have viscosity.

[0047] In an embodiment where the iron core is wound and formed using a viscous silicon steel sheet, it is advantageous for cost reduction and for reducing the eddy current loss of the iron core.

[0048] The rotor 10 according to the embodiment of the present application is installed such that the rotor 10 has a magnetic flux permeable member 12 and a support member 11. The magnetic flux permeable member 12 increases the magnetic induction intensity, and the support member 11 provides a certain supporting effect on the magnetic flux permeable member 12 and the permanent magnet 13. Moreover, the support member 11 can output the torque and rotational speed of the rotor 10, which is advantageous for improving the magnitude of the torque and rotational speed output by the rotor 10, and for improving the operating stability of the rotor 10. Also, by installing the support member 11 to be fixedly connected to the magnetic flux permeable member 12, it is advantageous for improving the connection strength between the support member 11 and the magnetic flux permeable member 12, further improving the overall structural strength of the rotor 10, and reducing the risk of relative movement between the support member 11 and the magnetic flux permeable member 12 in the operating situation of the high-speed operation of the rotor 10. Furthermore, it is advantageous for improving the maximum rotational speed and the structural stability of the high-speed operation of the rotor 10.

[0049] In some embodiments, the magnetic flux permeable member 12 is welded to the support member 11.

[0050] The welding between the magnetic flux permeable member 12 and the support member 11 may be laser welding, brazing, resistance welding, friction welding, diffusion welding, or the like.

[0051] Installing the magnetic flux permeable member 12 to be welded to the support member 11 is advantageous for further improving the connection strength between the magnetic flux permeable member 12 and the support member 11, and further advantageous for improving the rotational speed of the rotor 10 and the stability of the high-speed operation of the rotor 10.

[0052] Exemplarily, the magnetic flux permeable member 12 and the support member 11 may use zinc-based brazing. In this way, the brazing temperature can be reduced, and the magnetic performance of the permanent magnet 13 can be protected.

[0053] In some embodiments, the permanent magnet 13 is welded to the magnetic flux permeable member 12. The welding of the permanent magnet 13 and the magnetic flux permeable member 12 may be laser welding, brazing, resistance welding, friction welding, diffusion welding, or the like.

[0054] Installing the permanent magnet 13 to be welded to the magnetic flux permeable member 12 is advantageous for further improving the connection strength between the magnetic flux permeable member 12 and the permanent magnet 13, and is also advantageous for further improving the rotation speed of the rotor 10 and the stability of the rotor 10 operating at high speed.

[0055] Optionally, the permanent magnet 13 and the support member 11 may be in a planar connection, or may be connected by installing a concavo-convex structure, and may be specifically selected according to actual requirements.

[0056] As shown in FIG. 3, in some embodiments, one of the support member 11 and the magnetic flux permeable member 12 has a protrusion 10a, and the other has a concave groove 10b, and the protrusion 10a fits with the concave groove 10b.

[0057] Optionally, the concave groove 10b may have a shape such as a strip or a square. Exemplarily, as shown in FIG. 3, the concave groove 10b may extend along the radial direction Z of the rotor 10 and have openings at both ends along the radial direction Z, or the concave groove 10b may have no openings along the circumferential side perpendicular to the axial direction X, and may have openings only on one side or both sides of the axial direction X. The protrusion 10a may have any shape that conforms to the shape of the concave groove 10b, and may be specifically selected according to the shape. Exemplarily, the protrusion 10a may have the same shape as the concave groove 10b, and the two are in interference fit.

[0058] Optionally, the support member 11 may be installed to have the protrusion 10a and the magnetic permeable member 12 may be installed to have the concave groove 10b, or the support member 11 may be installed to have the concave groove 10b and the magnetic permeable member 12 may be installed to have the protrusion 10a. Exemplarily, FIGS. 3, 4, and 5 show an embodiment in which the support member 11 has the concave groove 10b and the magnetic permeable member 12 has the protrusion 10a. FIG. 6 shows an embodiment in which the support member 11 has the protrusion 10a and the magnetic permeable member 12 has the concave groove 10b. The protrusion 10a is locked in the concave groove 10b, thereby realizing the positioning along the circumferential direction Y of the rotor 10 of the magnetic permeable member 12 and the support member 11.

[0059] Optionally, the protrusion 10a and the concave groove 10b may be connected only by locking, or the protrusion 10a and the concave groove 10b may be installed and integrally connected by adhesive connection or welding connection or the like, thereby further improving the connection area between the support member 11 and the magnetic permeable member 12 and further improving the connection strength between the two.

[0060] Therefore, by installing the support member 11 and the magnetic permeable member 12 to be connected by the fitting of the protrusion 10a and the concave groove 10b, the mutual positioning along the circumferential direction Y of the rotor 10 of the magnetic permeable member 12 and the support member 11 can be realized, and during the operation process of the rotor 10, the risk that the magnetic permeable member 12 and the support member 11 float along the rotation direction can be reduced, and further the overall structural strength of the rotor 10 can be improved.

[0061] Optionally, one concave groove 10b may be formed on one of the support member 11 and the magnetic permeable member 12, and one protrusion 10a that fits with the concave groove 10b may be formed on the other, or a plurality of concave grooves 10b may be formed on one of the support member 11 and the magnetic permeable member 12, and a plurality of protrusions 10a that fit with the concave groove 10b may be formed on the other, and specifically, it may be selected according to actual needs.

[0062] The plurality of protrusions 10a and the concave grooves 10b may be arranged in any form, and any of them can achieve the purpose of improving the connection strength between the support member 11 and the magnetic permeable member 12.

[0063] In some embodiments, as shown in FIGS. 3 and 4, the plurality of protrusions 10a extend along the radial direction Z of the rotor 10 and are spaced along the circumferential direction Y of the rotor 10, and the plurality of concave grooves 10b are installed in a one-to-one correspondence with the plurality of protrusions 10a.

[0064] The plurality of protrusions 10a may be evenly spaced along the circumferential direction Y of the rotor 10. Of course, they may also be unevenly spaced. The concave grooves 10b correspond to the protrusions 10a one by one, and there is a protrusion 10a that fits into each concave groove 10b, and there is a concave groove 10b that fits into each protrusion 10a.

[0065] Install the protrusions 10a so that they extend along the radial direction Z of the rotor 10. During the rotation of the rotor 10, the boss generates a position restriction along the circumferential direction Y with respect to the support member 11 and the magnetic permeable member 12, and installing the plurality of protrusions 10a at intervals along the circumferential direction Y is beneficial for further reducing the risk that the support member 11 and the magnetic permeable member 12 generate relative displacement along the circumferential direction Y and improving the structural stability of the rotor 10.

[0066] Optionally, the concave groove 10b may be installed along a part of the axial direction X through the support member 11 or the magnetic permeable member 12, or the concave groove 10b may be installed through the support member 11 or the magnetic permeable member 12 along the axial direction X. FIG. 6 shows an embodiment in which the concave groove 10b is installed through the magnetic permeable member 12 along the axial direction.

[0067] In some embodiments, along the axial direction X, the concave groove 10b is installed through the support member 11, or along the axial direction X, the concave groove 10b is installed through the magnetic permeable member 12.

[0068] In the embodiment where the concave groove 10b is installed in the support member 11, the concave groove 10b is installed through the support member 11 along the axial direction X. In the embodiment where the concave groove 10b is installed in the magnetic permeable member 12, the concave groove 10b is installed through the magnetic permeable member 12 along the axial direction X.

[0069] Installing the concave groove 10b to penetrate the support member 11 or the magnetic permeable member 12 along the axial direction X is advantageous for improving the size of the protrusion 10a inserted into the concave groove 10b, improving the fitting area between the protrusion 10a and the concave groove 10b, and further improving the connection strength between the support member 11 and the magnetic permeable member 12.

[0070] In some embodiments, the protrusion 10a is welded to the concave groove 10b.

[0071] Exemplarily, the protrusion 10a and the concave groove 10b may be welded and connected by a welding method such as laser welding, brazing, resistance welding, friction welding or diffusion welding.

[0072] Installing the protrusion 10a to be welded to the concave groove 10b is advantageous for further improving the connection strength between the support member 11 and the magnetic permeable member 12 and further improving the overall structural strength of the rotor 10.

[0073] The magnetic permeable member 12 may also present a continuous annular shape as a whole. The continuously installed magnetic permeable member 12 can effectively overcome its own centrifugal force during the operation process of the rotor 10.

[0074] In some embodiments, a rib structure is installed on the circumferential side of the support member 11. The thickness of the rib may be 1 mm to 3 mm. After the assembly process of the rotor 10 is completed, a dynamic balance test is performed on the rotor 10. Based on the dynamic balance test results, a drilling or milling operation is performed at an appropriate position of the rib to overlap the rotation center line and the geometric center line of the rotor 10 as much as possible, reduce the centrifugal couple force during the operation process of the rotor 10, and further improve the stability during the operation process of the rotor 10.

[0075] As shown in FIG. 2, in some embodiments, the magnetic permeable member 12 presents an annular shape and includes a plurality of magnetic permeable sub-members 121. The magnetic permeable sub-members 121 present a sector-annular shape and are installed at intervals along the circumferential direction Y of the rotor 10. The permanent magnet 13 is provided between adjacent magnetic permeable sub-members 121.

[0076] In this way, the permanent magnet 13 can extend along the radial direction Z of the rotor 10 and present an annular fan shape to fill between adjacent magnetic permeable sub-members 121. The plurality of permanent magnets 13 are installed at intervals along the circumferential direction Y of the rotor 10 to form a spoke-like arrangement.

[0077] As can be understood, the spoke-like arrangement of the permanent magnets 13 is beneficial to improving the magnetic collection ability of the entire permanent magnet 13, reducing the eddy current loss of the permanent magnet 13, and further improving the torque of the rotor 10 and the efficiency of converting electrical energy into mechanical energy.

[0078] As shown in FIGS. 7 to 11, in some embodiments, the magnetic permeable member 12 presents an annular shape. The magnetic permeable member 12 has a plurality of accommodation chambers 12a. Along the radial direction Z of the rotor 10, the accommodation chambers 12a are installed through the magnetic permeable member 12. The plurality of accommodation chambers 12a are installed at intervals along the circumferential direction Y of the rotor 10, and a permanent magnet 13 is provided in each accommodation chamber 12a.

[0079] In this way, the permanent magnet 13 is installed inside the magnetic permeable member 12, which is beneficial to improving the connection strength between the permanent magnet 13 and the magnetic permeable member 12. It is beneficial to reducing the risk of the permanent magnet 13 loosening with respect to the magnetic permeable member 12, improving the magnitude of the centrifugal force that the permanent magnet 13 can withstand, and improving the rotation speed of the rotor 10. Also, the eddy current loss of the built-in permanent magnet 13 is small, which is beneficial to improving the operating efficiency of the motor in the scenario where the rotor 10 is used in a motor.

[0080] In order to improve the smoothness of the permanent magnet 13 entering the accommodation chamber 12a, a guide boss is installed in the accommodation chamber 12a, and a guide recess is installed in the permanent magnet 13. By fitting the guide boss and the guide recess, a guiding action for the permanent magnet 13 to enter the accommodation chamber 12a is provided, realizing that the permanent magnet 13 smoothly enters the accommodation chamber 12a. And after the permanent magnet 13 enters the accommodation chamber 12a, the guide boss and the guide recess can exert a certain position restricting effect on the permanent magnet 13 and the magnetic permeable member 12, maintaining the connection stability between the two.

[0081] As shown in FIGS. 11 and 12, in some embodiments, the magnetic permeable member 12 has a magnetic shielding portion 122 located on the side of the accommodation chamber 12a away from the support member 11. The thickness of the magnetic shielding portion 122 along the axial direction X is 1 mm to 4 mm.

[0082] After intensive research and a large number of experiments, the inventor has found that by limiting the thickness of the magnetic shielding portion 122 along the axial direction X to 1 mm to 4 mm, the motor can maintain a relatively high magnetic density in the air gap, and at the same time reduce the risk of the armature magnetic field directly acting on the permanent magnet 13 and generating relatively large eddy current losses, which is beneficial to improving the motor efficiency at high rotational speeds.

[0083] In some embodiments, the accommodation chamber 12a is in a sector-annular shape, the permanent magnet 13 is in a sector-annular shape, and is adapted to the accommodation chamber 12a.

[0084] Installing the accommodation chamber 12a and the permanent magnet 13 both in a sector-annular shape and making them fit is beneficial to further improving the fitting area between the permanent magnet 13 and the magnetic permeable member 12, and further improving the connection strength between the permanent magnet 13 and the magnetic permeable member 12. And installing the permanent magnet 13 in a sector shape is beneficial to reducing the eddy current loss of the permanent magnet 13, and is beneficial to improving the efficiency of the motor in the scenario where the rotor 10 is used in the motor.

[0085] In some embodiments, the magnetic permeable member 12 further has a hollow groove 12b. Along the circumferential direction Y of the rotor 10, the hollow groove 12b is provided on at least one side of the accommodation chamber 12a. The rotor 10 is made of a non-magnetic material and further includes a filling member 14 filled in the hollow groove 12b.

[0086] The hollow groove 12b may exhibit a circular, square or irregular shape. A strip-shaped concave groove may be provided in the hollow groove 12b. After the filling member 14 is injection-molded into the hollow groove 12b, ribs are formed in the region corresponding to the concave groove, which is advantageous for improving the connection strength between the filling member 14 and the magnetic permeable member 12.

[0087] Optionally, it may be installed to have a hollow groove 12b on one side along the circumferential direction Y of the accommodation chamber 12a, or may be installed to have hollow grooves 12b on both sides along the circumferential direction Y of the accommodation chamber 12a.

[0088] The filling member 14 may be made of any non-magnetic and non-conductive material. Exemplarily, the filling member 14 may be made of a plastic material. After the filling member 14 is processed and formed, it may be installed to be filled in the hollow groove 12b, or may be installed to be injection-molded into the hollow groove 12b by an injection molding process.

[0089] Since the region where the hollow groove 12b of the magnetic permeable member 12 is installed is filled with the non-magnetic filling member 14, the region corresponding to the hollow groove 12b of the magnetic permeable member 12 does not have magnetic permeability. In this way, with respect to the magnetic field distributed along the axial direction X of the rotor 10 generated by the stator, installing the hollow groove 12b can change the distribution of the magnetic field and improve the torque of the rotor 10. Installing the filling member 14 to fill the hollow groove 12b is advantageous for maintaining the structural strength of the entire magnetic permeable member 12.

[0090] FIG. 12 is a schematic structural diagram of the magnetic permeable member 12 in the rotor according to another embodiment of the present application.

[0091] As shown in FIG. 12, in some embodiments, the accommodation chamber 12a includes a first sub-chamber 121a and a second sub-chamber 122a that are axially spaced along the axial direction X. The first sub-chamber 121a is located on one side facing away from the support member 11 of the second sub-chamber 122a, and permanent magnets 13 are provided in both the first sub-chamber 121a and the second sub-chamber 122a.

[0092] That is, the permanent magnets 13 are circumferentially spaced along the circumferential direction Y and axially spaced along the axial direction X.

[0093] As can be understood, the first sub-chamber 121a and the second sub-chamber 122a may each be one, or the number of the first sub-chamber 121a and the second sub-chamber 122a may each be plural.

[0094] The central angles corresponding to the first sub-chamber 121a and the second sub-chamber 122a may be equal, or the first sub-chamber 121a and the second sub-chamber 122a may be arranged to correspond to different central angles respectively. Accordingly, the central angles corresponding to the permanent magnets 13 in the first sub-chamber 121a and the second sub-chamber 122a may be equal, or the permanent magnets 13 in the first sub-chamber 121a and the second sub-chamber 122a may be arranged to correspond to different central angles respectively.

[0095] Optionally, a hollow groove 12b may be provided in at least one side along the circumferential direction Y of the first sub-chamber 121a and the second sub-chamber 122a, or a hollow groove 12b may be provided in at least one side along the circumferential direction Y of one of the first sub-chamber 121a and the second sub-chamber 122a. Exemplarily, hollow grooves 12b are provided on both sides along the circumferential direction Y of the rotor 10 of the first sub-chamber 121a and the second sub-chamber 122a.

[0096] Installing in this way is advantageous for improving the sinusoidality of the air-gap magnetic field, enhancing the torque of the rotor 10, reducing torque pulsation, and improving the NVH performance of the rotor 10 in the scenario where the rotor 10 is used in a motor.

[0097] In some embodiments, both the first sub-chamber 121a and the second sub-chamber 122a are in the shape of a sector ring. The central angle corresponding to the first sub-chamber 121a is smaller than the central angle corresponding to the second sub-chamber 122a, and the central planes of the first sub-chamber 121a and the second sub-chamber 122a that are installed opposite to each other along the axial direction X overlap.

[0098] In this way, when the magnetic field generated by the stator penetrates the rotor 10 along the circumferential direction Y of the rotor 10, the magnetic field lines pass through the permanent magnets 13 in the first sub-chamber 121a, then through the permanent magnets 13 in the second sub-chamber 122a, which is advantageous for further improving the distribution of the motor magnetic field, enhancing the torque, reducing torque pulsation, and improving the NVH performance of the motor.

[0099] As shown in FIG. 13, in some embodiments, the magnetic permeable members 12 are provided on both sides of the support member 11 along the axial direction X, and the plurality of permanent magnets 13 are respectively connected to the two magnetic permeable members 12. The rotor 10 has a central plane, which is perpendicular to the axial direction X. The support member 11, the magnetic permeable members 12, and the plurality of permanent magnets 13 are respectively installed symmetrically with respect to the central plane.

[0100] As shown in FIG. 13, in some alternative embodiments, the two magnetic permeable members 12 may be installed so as to be connectable to the same support member 11. The central plane is located in the middle along the axial direction X of the support surface, and the magnetic permeable members 12 and the permanent magnets 13 connected to the magnetic permeable members 12 are installed symmetrically with respect to the central plane respectively.

[0101] As shown in FIG. 14, in some other alternative embodiments, the two magnetic permeable members 12 are respectively connected to the two support members 11, and the two support members 11 are connected to each other and located between the two magnetic permeable members 12. The central plane is located between the two support members 11.

[0102] As shown in FIGS. 15 to 17, in some other alternative embodiments, one magnetic permeable member 12 is installed to be inserted into one support member 11, and the magnetic permeable member 12 may be installed symmetrically with respect to the central plane. Permanent magnets 13 are installed on both sides along the axial direction X of the magnetic permeable member 12, and the permanent magnets 13 are installed symmetrically with respect to the central plane. Exemplarily, the protrusion 10a on the magnetic permeable member 12 may be inserted into the concave groove 10b of the support member 11 to realize the insertion connection between the support member 11 and the magnetic permeable member 12.

[0103] In the process of the rotor 10 operating in the magnetic field generated by the stator, it may be subject to Lorentz force along the axial direction X. The plurality of permanent magnets 13 and the magnetic permeable members 12 are installed symmetrically with respect to the central plane. The magnitudes of the forces along the axial direction X received by the permanent magnets 13 and the magnetic permeable members 12 that are symmetric with respect to the central plane are substantially the same, and the directions are opposite. The two can cancel each other out, and the force on the entire rotor 10 along the axial direction X is basically zero, which is beneficial to maintaining the balance of the force received by the rotor 10 in the axial direction X.

[0104] Therefore, installing in this way is beneficial to ensuring the balance of the rotor 10, and further beneficial to improving the operating stability and NVH performance of the rotor 10.

[0105] The motor according to the embodiment of the present application includes the rotor 10 according to any one of the above embodiments. Since the motor according to the embodiment of the present application uses the rotor 10 according to any one of the above embodiments, it has the same technical effects and will not be described further here.

[0106] In some embodiments, the motor according to the embodiments of the present application includes a rotor 10, and the rotor 10 includes a support member 11, a magnetic permeable member 12, and a permanent magnet 13. The magnetic permeable member 12 is welded to the support member 11, and the magnetic permeable member is welded to the permanent magnet 13. A concave groove 10b is provided on one of the magnetic permeable member 12 and the support member 11, and a protrusion 10a is provided on the other, and the concave groove 10b and the protrusion 10a are welded and connected. The two magnetic permeable members 12 are respectively provided on both sides along the axial direction X of the support member 11. The magnetic permeable member 12 is installed in an annular shape and includes a plurality of magnetic permeable sub-members 121 having a sector-annular shape. Each magnetic permeable sub-member 121 has a receiving chamber 12a, and the receiving chamber 12a includes a first sub-chamber 121a and a second sub-chamber 122a installed at intervals along the axial direction X. The first sub-chamber 121a is located on one side facing away from the support member 11 of the second sub-chamber 122a, and the central angle corresponding to the first sub-chamber 121a is smaller than the central angle corresponding to the second sub-chamber 122a. The plurality of magnetic permeable sub-members 121 are respectively provided in the first sub-chamber 121a and the second sub-chamber 122a, and are installed in a free form in the first sub-chamber 121a or the second sub-chamber 122a. Hollow grooves 12b are respectively provided along both sides in the circumferential direction Y in the first sub-chamber 121a and the second sub-chamber 122a, and the hollow grooves 12b are installed to penetrate the magnetic permeable member 12 along the radial direction Z of the rotor 10. Further, the filling member 14 is installed to be filled into the hollow groove 12b by an injection molding method.

[0107] As shown in FIG. 13, in some embodiments, the support member 11 includes a support ring 111 and a support plate 112. The support ring 111 is annular and extends along the axial direction X. The support plate 112 is plate-shaped and is provided at one end along the axial direction of the support ring 111. The magnetic permeable member 12 is fitted into the support ring 111. Along the axial direction, the support ring 111 has a first end face 111a away from one side of the support plate 112, and the rotor 10 has a second end face 10c away from one side of the support plate 112. The distance between the first end face 111a and the support plate 112 is smaller than the distance between the second end face 10c and the support plate 112.

[0108] Alternatively, after being formed respectively, the support ring 111 and the support member 112 may be integrally connected by a connection method such as welding, screw connection, and riveting, or the support ring 111 and the support member 112 may be installed so as to be integrally formed by a pressing process.

[0109] The magnetic permeable member 12 is fitted in the support ring 111, and the magnetic permeable member 12 can connect the circumferential side surface of the support ring 111 and the end surface of the support plate 112 simultaneously. Exemplarily, the magnetic permeable member 12 is welded to both the circumferential side surface of the support ring 111 and the end surface of the support plate 112. In this way, it is advantageous to further improve the connection strength between the magnetic permeable member 12 and the support member 11.

[0110] Depending on the installation positions of the magnetic permeable member 12 and the permanent magnet 13, the second end surface 10c may be the end surface on the side away from the support plate 112 of the magnetic permeable member 12, or the second end surface 10c may be the end surface on the side away from the support plate 112 of the permanent magnet 13. In the scenario where the rotor 10 is used in a motor, the second end surface 10c is the air gap interface, and installing the first end surface 111a at a distance from the air gap interface, and installing the first end surface 111a to be located inside the rotor 10 close to the air gap interface, are advantageous for reducing the eddy current loss of the support member 11 and improving the efficiency of the motor.

[0111] The distance between the first end surface 111a and the second end surface 10c is not limited and may be selected according to actual requirements.

[0112] In some embodiments, the permanent magnet 13 on the side close to the second end surface 10c has an interrupted surface, the interrupted surface is perpendicular to the axial direction X, the permanent magnet 13 is symmetrically installed with respect to the interrupted surface, and the first end surface 111a overlaps the interrupted surface of the permanent magnet 13.

[0113] Along the axial direction X, among the plurality of permanent magnets 13, the permanent magnet 13 closer to the second end face 10c is the permanent magnet 113 farthest from the support plate 112, and its interrupted surface overlaps with the first end face 111a.

[0114] After intensive research and a large number of experimental analyses, the inventor found that arranging the first end face 111a to overlap with the interrupted surface of the permanent magnet 13 is beneficial for ensuring the connection strength between the support member 11 and the magnetic permeable member 12, while minimizing the eddy current loss of the support member 11 and improving the efficiency of the motor.

[0115] The thickness of the support plate 112 is not limited and may be selected according to actual needs.

[0116] In some embodiments, the thickness of the support plate 112 along the axial direction X is 3 mm to 10 mm.

[0117] Exemplarily, the thickness of the support plate 112 may be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, etc.

[0118] After intensive research and a large number of experimental analyses, the inventor found that setting the thickness of the support plate 112 along the axial direction X within the range of 3 mm to 10 mm is beneficial for setting the support plate 112 and the support ring 111 to be press-formed together by the pressing process, and in this way, it is beneficial for simplifying the processing process of the support member 11.

[0119] Through further research and experimental analysis, the inventor found that when the thickness of the support plate 112 is within the range of 3 mm to 5 mm, the smoothness of the press-forming process of the support plate 112 and the support ring 111 can be maximally improved.

[0120] The motor according to the embodiment of the present application is advantageous for improving the maximum rotational speed of the motor, and the operation stability and NVH performance in the operating condition of high rotational speed. Moreover, it is advantageous for reducing the eddy current loss of the rotor 10, and improving the torque of the rotor 10 and the operation efficiency of the motor.

[0121] It should be noted that, unless they conflict, the embodiments and features in the embodiments in the present application can be combined with each other.

[0122] Finally, it should be noted that the above embodiments are only for explaining the technical solution of the present application, rather than limiting it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that it is still possible to modify the technical solutions described in each of the above embodiments, or perform equivalent substitution on some of their technical features. However, these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of each embodiment of the present application.

Description of Reference Numerals

[0123] 10: Rotor, 10a: Protrusion, 10b: Concave groove, 10c: Second end face, 11: Support member, 111: Support ring, 111a: First end face, 112: Support plate, 12: Magnetic permeable member, 12a: Accommodation chamber, 121a: First sub-chamber, 122a: Second sub-chamber, 12b: Hollow groove, 121: Magnetic permeable sub-member, 122: Magnetic shielding portion, 13: Permanent magnet, 14: Filling member X: Axial direction, Y: Circumferential direction, Z: Radial direction.

Claims

1. A rotor of a motor, comprising: a support member; a magnetic permeable member provided on at least one side of the rotor along the axial direction of the support member and fixedly connected to the support member; a permanent magnet connected to the magnetic permeable member; a motor including the above.

2. The rotor according to claim 1, wherein the magnetic permeable member is welded to the support member, and / or the permanent magnet is welded to the magnetic permeable member.

3. The rotor according to claim 1 or 2, wherein one of the support member and the magnetic permeable member has a protrusion, and the other has a concave groove, and the protrusion is fitted with the concave groove.

4. The rotor according to claim 3, wherein the plurality of protrusions extend along the radial direction of the rotor and are spaced along the circumferential direction of the rotor, and the plurality of concave grooves are installed in one-to-one correspondence with the plurality of protrusions.

5. The rotor according to claim 3 or 4, wherein along the axial direction, the concave groove is installed through the support member, or along the axial direction, the concave groove is installed through the magnetic permeable member.

6. The rotor according to any one of claims 3 to 5, wherein the protrusion is welded to the concave groove.

7. The rotor according to any one of claims 1 to 6, wherein the magnetic permeable member is annular and includes a plurality of magnetic permeable sub-members, the magnetic permeable sub-members are fan-shaped annular, and are spaced along the circumferential direction of the rotor, and the permanent magnet is provided between adjacent magnetic permeable sub-members.

8. The rotor according to any one of claims 1 to 7, wherein the magnetic permeable member is annular, the magnetic permeable member has a plurality of accommodation chambers, along the radial direction of the rotor, the accommodation chambers are installed through the magnetic permeable member, the plurality of accommodation chambers are spaced along the circumferential direction of the rotor, and the permanent magnet is provided in each accommodation chamber.

9. The rotor according to claim 8, wherein the accommodation chamber is fan-shaped annular, the permanent magnet is fan-shaped annular, and conforms to the accommodation chamber.

10. The magnetic permeable member further has a hollow groove, along the circumferential direction of the rotor, the hollow groove is provided on at least one side of the accommodation chamber; The rotor further includes a filling member, the filling member is made of a non-magnetic material and is filled in the hollow groove.

11. The accommodating chamber includes a first sub-chamber and a second sub-chamber that are installed at intervals along the axial direction. The first sub-chamber is located on one side facing away from the support member of the second sub-chamber, and the permanent magnet is provided in both the first sub-chamber and the second sub-chamber. The rotor according to any one of claims 8 to 10.

12. Both the first sub-chamber and the second sub-chamber are in a sector-annular shape. The central angle corresponding to the first sub-chamber is smaller than the central angle corresponding to the second sub-chamber, and the central planes of the first sub-chamber and the second sub-chamber that are installed opposite to each other along the axial direction overlap. The rotor according to claim 11.

13. The magnetic permeable member is provided on both sides of the support member along the axial direction, and a plurality of the permanent magnets are connected to the magnetic permeable member. The rotor has a central plane, the central plane is perpendicular to the axial direction, and the support member, the magnetic permeable member, and a plurality of the permanent magnets are respectively installed symmetrically with respect to the central plane. The rotor according to any one of claims 1 to 12.

14. The support member includes a support ring and a support plate. The support ring is in an annular shape and extends along the axial direction. The support plate is in a plate shape and is provided at one end of the support ring along the axial direction. The magnetic permeable member is fitted into the support ring. Along the axial direction, the support ring has a first end face away from one side of the support plate, the rotor has a second end face away from one side of the support plate, and the distance between the first end face and the support plate is smaller than the distance between the second end face and the support plate. The rotor according to any one of claims 1 to 13.

15. A motor including the rotor according to any one of claims 1 to 14.

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