Rotor assembly, motor and manufacturing method of rotor assembly

Abstract

The invention belongs to the technical field of rotor manufacturing, and discloses a rotor assembly, a motor and a manufacturing method of the rotor assembly. The rotor assembly comprises a mounting shaft, a rotor magnet and a Hall magnet, the rotor magnet is mounted on the mounting shaft, the rotor magnet is a sintered NdFeB magnet, the Hall magnet is mounted on the mounting shaft, the Hall magnet and the rotor magnet are coaxially arranged at an interval, and the Hall magnet is a bonded NdFeB magnet. The motor provided by the invention comprises the rotor assembly. According to the manufacturing method of the rotor assembly provided by the invention, the rotor assembly is manufactured through a process of assembling first and then magnetizing, so that a plurality of magnets are magnetized at the same time and are not limited by the magnetic direction any more. And secondly, the problem of concentricity deviation of the magnet caused by magnetic interference in the traditional process is avoided, the concentricity of each component is improved, and the processing precision requirement is reduced. And meanwhile, the magnetizing process is not limited by a single-direction magnetizing mode any more, so that the manufacturing cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of rotor manufacturing, and in particular to a rotor assembly, a motor and a method for manufacturing the rotor assembly. Background Art

[0002] With the advancement of science and technology, electric motors are widely used in automated and intelligent manufacturing industries. As the core power output component of electric motors, the rotor assembly has an increasing market demand and higher quality requirements.

[0003] As for the rotor structure, it mainly includes a rotating shaft, a bracket arranged on the rotating shaft and a magnet arranged on the bracket. As for its manufacturing process, the magnet is first prepared by using magnetic materials, and then the magnet is installed on the bracket before the magnetization process. According to the related technology, when magnetizing a rotor assembly with multiple magnets, it is impossible to achieve integrated magnetization, and the magnetization is uneven. Secondly, because the magnet is assembled with the rotating shaft after magnetization, there is a problem of poor coaxiality. At the same time, in order to reduce the influence of magnetism on assembly, it is necessary to improve the processing accuracy of the magnet.

[0004] Therefore, there is an urgent need for a rotor assembly, a motor and a method for manufacturing the rotor assembly to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a rotor assembly, a motor and a method for manufacturing a rotor assembly, aiming to solve the problem that the prior art cannot synchronously magnetize a rotor assembly with multiple magnets and there is a coaxiality difference between the rotor and the rotating shaft. The rotor assembly, the motor and the method for manufacturing a rotor assembly can realize the simultaneous magnetization of multiple magnets, so that the rotor assembly is no longer limited by the directionality of the magnets during the design and production process, greatly improving the design freedom.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A rotor assembly, comprising:

[0008] Install the shaft;

[0009] A rotor magnet is mounted on the mounting shaft, wherein the rotor magnet is configured as a sintered NdFeB magnet;

[0010] The Hall magnet is installed on the installation shaft and is coaxially spaced from the rotor magnet. The Hall magnet is configured as a bonded NdFeB magnet.

[0011] In some possible embodiments, the rotor magnet is configured as an integrally formed cylindrical structure, or the rotor magnet is configured as a cylindrical structure formed by splicing multiple arc magnets, and the rotor magnet includes one or more pairs of magnetic poles; and / or the Hall magnet is configured as a cylindrical structure.

[0012] In some possible implementations, the rotor magnet and the mounting shaft are fixed by bonding; and / or the Hall magnet and the mounting shaft are fixed by bonding.

[0013] In some possible embodiments, the machining accuracy of the mounting hole of the rotor magnet is lower than the machining accuracy of the outer circle of the rotor magnet; and / or, the machining accuracy of the mounting hole of the Hall magnet is lower than the machining accuracy of the outer circle of the Hall magnet.

[0014] A motor comprises a rotor assembly as described in any of the above schemes.

[0015] A method for manufacturing a rotor assembly comprises the steps of:

[0016] Provide a mounting shaft, a rotor magnet and a Hall magnet, wherein the rotor magnet is configured as a sintered NdFeB magnet, and the Hall magnet is configured as a bonded NdFeB magnet;

[0017] Mounting the rotor magnet on the mounting shaft;

[0018] The Hall magnet is mounted on the mounting shaft and is coaxially spaced apart from the rotor magnet;

[0019] The rotor magnet and the Hall magnet are synchronously magnetized.

[0020] In some possible implementations, when the rotor magnet and the Hall magnet are synchronously magnetized, the rotor magnet and the Hall magnet are magnetized in the same direction.

[0021] In some possible embodiments, a magnetizing device is used to synchronously magnetize the rotor magnet and the Hall magnet. The magnetizing device includes a magnetizing chamber, and a first magnetizing position and a second magnetizing position are arranged in the magnetizing chamber. The first magnetizing position corresponds to the rotor magnet, and the second magnetizing position corresponds to the Hall magnet.

[0022] In some possible implementations, the rotor magnet and the Hall magnet are synchronously magnetized along the radial direction of the installation axis.

[0023] Beneficial effects of the present invention: The rotor assembly provided by the present invention, by setting the Hall magnet as a bonded NdFeB magnet, the bonded NdFeB can be arbitrarily and evenly magnetized in multiple directions, and the rotor magnet is set as a sintered NdFeB magnet. The sintered NdFeB has a high magnetic energy product and strong magnetism, but its magnetism is directional. By combining the sintered NdFeB magnet with the bonded NdFeB magnet, the integrated magnetization of the Hall magnet and the rotor magnet can be achieved, and the difference problem of multiple magnets in the magnetization direction can be solved, so that the design and production process is no longer limited by the directionality of the magnet, which greatly improves the design freedom and thus solves the limitations of traditional multiple magnets in the magnetization direction.

[0024] The motor provided by the present invention includes the above-mentioned rotor assembly. By setting the above-mentioned rotor assembly, the motor can adapt to the needs of different application scenarios, significantly improve production efficiency, reduce costs, and optimize the performance of the magnet combination.

[0025] The present invention also provides a method for manufacturing a rotor assembly, first installing the rotor magnet and the Hall magnet on the mounting shaft respectively, and then integrating and synchronously magnetizing the rotor magnet and the Hall magnet to achieve simultaneous magnetization of multiple magnets, which is no longer restricted by the magnetic direction. Secondly, it avoids the concentricity deviation problem of the magnet caused by magnetic interference in the traditional process, improves the concentricity of each component, and reduces the processing accuracy requirements. At the same time, since the magnetization process is no longer limited to the magnetization method in a single direction, the assembly of high-precision components can be completed under lower-cost processing conditions, reducing the excessive requirements for the inner hole accuracy of the magnet, thereby effectively reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional view of a rotor assembly provided by an embodiment of the present invention.

[0027] In the figure:

[0028] 100. Mounting shaft; 200. Rotor magnet; 300. Hall magnet. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] The present embodiment provides a rotor assembly, a motor and a method for manufacturing a rotor assembly, aiming to solve the problem that the prior art cannot synchronously magnetize a rotor assembly with multiple magnets and there is a coaxiality difference between the rotor and the rotating shaft. The rotor assembly, the motor and the method for manufacturing a rotor assembly can realize the simultaneous magnetization of multiple magnets, so that the rotor assembly is no longer limited by the directionality of the magnets during the design and production process, greatly improving the design freedom.

[0034] like Figure 1 As shown, the rotor assembly includes a mounting shaft 100, a rotor magnet 200 and a Hall magnet 300. The rotor magnet 200 is mounted on the mounting shaft 100. The rotor magnet 200 is configured as a sintered NdFeB magnet. The Hall magnet 300 is mounted on the mounting shaft 100 and is coaxially spaced with the rotor magnet 200. The Hall magnet 300 is configured as a bonded NdFeB magnet. It is understood that the specific number of the rotor magnet 200 and the Hall magnet 300 can be set according to demand.

[0035] The above-mentioned rotor assembly, by setting the Hall magnet 300 as a bonded NdFeB magnet, the bonded NdFeB can be arbitrarily and evenly magnetized in multiple directions, and the rotor magnet 200 is set to a sintered NdFeB magnet. The sintered NdFeB has a high magnetic energy product and strong magnetism, but its magnetism is directional. By combining the sintered NdFeB magnet with the bonded NdFeB magnet, the integrated magnetization of the Hall magnet 300 and the rotor magnet 200 can be achieved, and the difference problem of multiple magnets in the magnetization direction can be solved, so that the design and production process is no longer limited by the directionality of the magnet, which greatly improves the design freedom and thus solves the limitations of traditional multiple magnets in the magnetization direction.

[0036] Continue to see Figure 1 , the rotor magnet 200 is configured as an integrally formed cylindrical structure, or the rotor magnet 200 is configured as a cylindrical structure formed by splicing multiple arc-shaped magnets, and the rotor magnet 200 includes one or more pairs of magnetic poles, wherein one NS level belongs to a pair of magnetic poles; and / or, the Hall magnet 300 is configured as a cylindrical structure. The rotor magnet 200 and the Hall magnet 300 are coaxially sleeved on the mounting shaft 100, and the setting of the cylindrical structure improves the overall aesthetics of the rotor assembly. In other embodiments, the Hall magnet 300 may also be configured as other shapes. During assembly, the rotor magnet 200 and the mounting shaft 100 are fixed by bonding; and / or, the Hall magnet 300 and the mounting shaft 100 are fixed by bonding. This setting is easy to operate and reduces installation costs.

[0037] Preferably, the machining accuracy of the mounting hole of the rotor magnet 200 is lower than the machining accuracy of the outer circle of the rotor magnet 200; and / or, the machining accuracy of the mounting hole of the Hall magnet 300 is lower than the machining accuracy of the outer circle of the Hall magnet 300. The mounting hole of the rotor magnet 200 is the through hole opened when the rotor magnet 200 is sleeved on the mounting shaft 100; the mounting hole of the Hall magnet 300 is the through hole opened when the Hall magnet 300 is sleeved on the mounting shaft 100. In the prior art, the magnet is assembled with the mounting shaft 100 after magnetization. In order to solve the problem that the mounting shaft 100 will be adsorbed to one side and cause concentric deviation during assembly, the machining accuracy of the inner hole of the magnet is usually improved to achieve the effect of reducing concentric deviation. In this embodiment, the integrated magnetization of the Hall magnet 300 and the rotor magnet 200 is achieved by combining the sintered NdFeB magnet with the bonded NdFeB magnet. The magnet can be assembled to the mounting shaft 100 first and then magnetized. There is no magnetic interference problem during assembly, and the outer circle machining accuracy of the magnet can be improved, and its assembly accuracy can be improved.

[0038] The motor provided in this embodiment includes the above-mentioned rotor assembly. By setting the above-mentioned rotor assembly, the motor can adapt to the needs of different application scenarios, significantly improve production efficiency, reduce costs, and optimize the performance of the magnet combination.

[0039] The manufacturing method of the rotor assembly provided in this embodiment comprises the following steps:

[0040] S1. Provide a mounting shaft 100, a rotor magnet 200 and a Hall magnet 300, wherein the rotor magnet 200 is configured as a sintered NdFeB magnet, and the Hall magnet 300 is configured as a bonded NdFeB magnet;

[0041] Exemplarily, several rotor magnets 200 are provided. When one rotor magnet 200 is provided, the rotor magnet 200 can be provided as an integral cylindrical structure or a cylindrical structure formed by splicing multiple arc magnets, and the rotor magnet 200 includes one or more pairs of magnetic poles.

[0042] S2, installing the rotor magnet 200 on the installation shaft 100;

[0043] S3, installing the Hall magnet 300 on the mounting shaft 100 and setting it coaxially and spaced apart from the rotor magnet 200;

[0044] S4, synchronously magnetizing the rotor magnet 200 and the Hall magnet 300.

[0045] The manufacturing method of the above-mentioned rotor assembly first installs the rotor magnet 200 and the Hall magnet 300 on the mounting shaft 100 respectively, and then performs integrated synchronous magnetization on the rotor magnet 200 and the Hall magnet 300 to achieve simultaneous magnetization of multiple magnets, which is no longer restricted by the magnetic direction. Secondly, it avoids the concentricity deviation problem of the magnet caused by magnetic interference in the traditional process, improves the concentricity of each component, and reduces the processing accuracy requirements. At the same time, since the magnetization process is no longer limited to the magnetization method in a single direction, the assembly of high-precision components can be completed under lower-cost processing conditions, reducing the excessive requirements for the inner hole accuracy of the magnet, thereby effectively reducing the manufacturing cost and having broad application prospects.

[0046] Preferably, when the rotor magnet 200 and the Hall magnet 300 are magnetized synchronously, the rotor magnet 200 and the Hall magnet 300 are magnetized in the same direction. Figure 1 The figure shows the allowable magnetizing directions of the rotor magnet 200 and the Hall magnet 300. The rotor magnet 200 and the Hall magnet 300 are magnetized in the same direction, which effectively simplifies the process steps and improves the production and processing efficiency. For example, the rotor magnet 200 and the Hall magnet 300 are magnetized synchronously along the radial direction of the mounting shaft 100.

[0047] Optionally, a magnetizing device is used to synchronously magnetize the rotor magnet 200 and the Hall magnet 300. The magnetizing device includes a magnetizing chamber, in which a first magnetizing position and a second magnetizing position are arranged. The first magnetizing position corresponds to the rotor magnet 200, and the second magnetizing position corresponds to the Hall magnet 300, so as to avoid incorrect alignment of the rotor magnet 200 and the Hall magnet 300 during magnetization.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A rotor assembly, characterized in that: include: Install the shaft (100); A rotor magnet (200) is mounted on the mounting shaft (100), wherein the rotor magnet (200) is configured as a sintered NdFeB magnet; A Hall magnet (300) is mounted on the mounting shaft (100) and is coaxially spaced from the rotor magnet (200). The Hall magnet (300) is configured as a bonded NdFeB magnet.

2. The rotor assembly according to claim 1, characterized in that The rotor magnet (200) is configured as an integrally formed cylindrical structure, or the rotor magnet (200) is configured as a cylindrical structure formed by splicing a plurality of arc-shaped magnets, and the rotor magnet (200) comprises one or more pairs of magnetic poles; and / or the Hall magnet (300) is configured as a cylindrical structure.

3. The rotor assembly according to claim 1, characterized in that: The rotor magnet (200) and the mounting shaft (100) are fixed by bonding; and / or the Hall magnet (300) and the mounting shaft (100) are fixed by bonding.

4. The rotor assembly according to claim 2, characterized in that: The machining accuracy of the mounting hole of the rotor magnet (200) is lower than the machining accuracy of the outer circle of the rotor magnet (200); and / or the machining accuracy of the mounting hole of the Hall magnet (300) is lower than the machining accuracy of the outer circle of the Hall magnet (300).

5. A motor, characterized in that Comprising a rotor assembly as described in any one of claims 1-4.

6. A method for manufacturing a rotor assembly, characterized in that: Includes steps: A mounting shaft (100), a rotor magnet (200) and a Hall magnet (300) are provided, wherein the rotor magnet (200) is configured as a sintered NdFeB magnet, and the Hall magnet (300) is configured as a bonded NdFeB magnet; Installing the rotor magnet (200) on the installation shaft (100); The Hall magnet (300) is installed on the installation shaft (100) and is coaxially spaced from the rotor magnet (200); The rotor magnet (200) and the Hall magnet (300) are synchronously magnetized.

7. The method for manufacturing a rotor assembly according to claim 6, characterized in that: When the rotor magnet (200) and the Hall magnet (300) are magnetized synchronously, the rotor magnet (200) and the Hall magnet (300) are magnetized in the same direction.

8. The method for manufacturing a rotor assembly according to claim 6, characterized in that: The rotor magnet (200) and the Hall magnet (300) are synchronously magnetized using a magnetizing device, wherein the magnetizing device comprises a magnetizing chamber, wherein a first magnetizing position and a second magnetizing position are arranged in the magnetizing chamber, wherein the first magnetizing position corresponds to the rotor magnet (200), and the second magnetizing position corresponds to the Hall magnet (300).

9. The method for manufacturing a rotor assembly according to claim 7, characterized in that: The rotor magnet (200) and the Hall magnet (300) are synchronously magnetized along the radial direction of the installation shaft (100).

Images