Magnetic steel mounting and fixing structure, rotor assembly and motor

Abstract

The utility model discloses a magnetic steel mounting and fixing structure, a rotor assembly and a motor, the magnetic steel mounting and fixing structure comprises a rotor iron core, a plurality of magnetic steel bodies and a fixing sleeve, and the periphery of the rotor iron core is provided with a plurality of limiting grooves which are annularly arranged at intervals; the plurality of magnetic steel bodies are arranged in the plurality of limiting grooves, and the magnetic steel bodies abut against the two side walls of the limiting grooves along the two edges of the circumferential direction of the rotor iron core; the fixing sleeve sleeves the periphery of the rotor core, and the inner circumferential wall of the fixing sleeve abuts against the outer wall of the magnetic steel body. The two side walls of the limiting groove abut against the two edges, in the circumferential direction of the rotor iron core, of the magnetic steel body, circumferential positioning and fixing are conducted on the magnetic steel body, the magnetic steel body is tightly held on the periphery of the rotor iron core through the fixing sleeve, and radial positioning and fixing are conducted on the magnetic steel body. The limiting groove only plays a role in circumferential positioning and assists the installation of the magnetic steel body, so that the magnetic leakage is obviously reduced, the output torque is improved, the torque pulsation is reduced, and the utilization rate of the magnetic steel is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of permanent magnet synchronous motors, and in particular to a magnet mounting and fixing structure, rotor assembly and motor. Background Technology

[0002] In industrial fields such as electric vehicles, aerospace, and artificial intelligence, traditional surface-mounted permanent magnet synchronous motors are widely used as the main power source. These motors have advantages such as high operating efficiency, high power density, and fast dynamic response. The magnets of surface-mounted permanent magnet synchronous motors are mounted on the surface of the rotor core. Usually, the magnets are fixed by limiting slots to prevent radial displacement during motor operation. The part of the magnet that extends into the limiting slot effectively restricts the radial movement of the permanent magnet. However, the part of the magnetic field lines that the magnet engages with the limiting slot not only does not generate torque, but also increases the rotor core loss. This structure will generate more leakage flux, reduce the utilization rate of the magnet, increase the manufacturing cost of the motor, and also generate obvious torque pulsation during motor optimization, reducing motor performance. In addition, the magnets are made of neodymium iron boron material, which is hard and brittle with extremely strong magnetic force. The sharp corners of the magnets that extend into the limiting slot are very easy to break during assembly, causing additional losses. Utility Model Content

[0003] The purpose of this utility model is to provide a magnet mounting and fixing structure, a rotor assembly and a motor to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0005] Firstly, this utility model provides a magnet mounting and fixing structure, including:

[0006] The rotor core has multiple limiting grooves arranged in a ring at intervals on its outer periphery.

[0007] The rotor core has multiple magnets, which are disposed in multiple limiting grooves. The two edges of the magnets along the circumferential direction of the rotor core abut against the two side walls of the limiting grooves.

[0008] A fixing sleeve is fitted around the outer periphery of the rotor core, and the inner peripheral wall of the fixing sleeve abuts against the outer wall of the magnet.

[0009] The beneficial effects of the magnetic steel mounting and fixing structure of this utility model are:

[0010] This invention uses the two side walls of the limiting groove to abut against the two edges of the magnet along the circumference of the rotor core, thereby circumferentially positioning and fixing the magnet. The fixing sleeve holds the magnet tightly to the outer circumference of the rotor core, thereby radially positioning and fixing the magnet. In this invention, the magnet no longer has a part extending into the limiting groove. The limiting groove only serves the function of circumferential positioning and assists in the installation of the magnet. This significantly reduces magnetic leakage, increases output torque, reduces torque pulsation, and improves the utilization rate of the magnet.

[0011] As a further improvement to the above technical solution, the two edges of the magnet body along the circumference of the rotor core are both convex rounded corner structures.

[0012] As a further improvement to the above technical solution, the two side walls of the limiting groove along the circumference of the rotor core are both concave rounded corner structures.

[0013] As a further improvement to the above technical solution, the cross-section of the magnet is arc-shaped, and the cross-section of the limiting groove is an arc groove structure.

[0014] As a further improvement to the above technical solution, the fixing sleeve is a steel component.

[0015] As a further improvement to the above technical solution, the plurality of limiting grooves are arranged at equal intervals.

[0016] This utility model also provides a rotor assembly, including the aforementioned magnet mounting and fixing structure, and a rotor shaft, wherein the rotor core is fixedly sleeved on the outer periphery of the rotor shaft.

[0017] As a further improvement to the above technical solution, the rotor bushing is provided with at least two rotating bearings, and the rotor core is disposed between two adjacent rotating bearings.

[0018] This utility model also provides an electric motor, including the rotor assembly and a stator assembly. The stator assembly includes a stator core rotatably sleeved on the outer periphery of the rotor shaft and a plurality of stator windings annularly spaced on the stator core. The stator core and the rotor core are positioned corresponding to each other.

[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0021] Figure 1 This is a schematic diagram of an embodiment of the rotor assembly provided by this utility model;

[0022] Figure 2 This is a front view of an embodiment of the rotor assembly provided by this utility model;

[0023] Figure 3 yes Figure 2 Sectional view of section AA;

[0024] Figure 4 yes Figure 3 A magnified view of part C in the middle;

[0025] Figure 5 This is a schematic diagram of an embodiment of the motor provided by this utility model;

[0026] Figure 6 This is a front view of an embodiment of the motor provided by this utility model;

[0027] Figure 7 yes Figure 6 Sectional view of section BB;

[0028] Icon labels:

[0029] Rotor core 100; limiting groove 110;

[0030] Magnetic steel body 200;

[0031] Fixing sleeve 300;

[0032] Rotor shaft 400; Rotary bearing 410;

[0033] Magnet installation and fixing structure 500;

[0034] Rotor assembly 600;

[0035] Stator assembly 700; stator core 710; stator winding 720. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, etc., are based on the directional or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0039] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0040] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this utility model, not all embodiments.

[0041] In a surface-mounted permanent magnet synchronous motor, the magnet 200 is mounted on the surface of the rotor core 100. Typically, a limiting slot 110 is used to fix the magnet 200. To effectively limit the radial movement of the magnet 200, a slot is provided on the side wall of the limiting slot 110, and the magnet 200 has a sharp corner extending into the slot to prevent radial displacement during motor operation. However, this structure generates more magnetic leakage, reduces the utilization rate of the magnet, and increases the loss of the rotor core 100, thus increasing the manufacturing cost of the motor. The slot in the limiting slot 110 occupies space in the circumferential direction of the rotor core 100, reducing the rotor optimization space and easily generating torque pulsation, thus reducing motor performance. To ensure that the magnet 200 extends into the limiting slot 110, the volume of the permanent magnet needs to be increased, reducing the utilization rate of the permanent magnet. Furthermore, machining accuracy needs to be improved during processing to ensure that assembly does not interfere.

[0042] Therefore, this utility model proposes a magnet mounting and fixing structure 500. The optimized magnet body 200 no longer has a slot that extends into the limiting groove 110. The limiting groove 110 only serves as a circumferential positioning function.

[0043] like Figure 3 and Figure 4 As shown, the magnet mounting and fixing structure 500 includes a rotor core 100, multiple magnet bodies 200 and a fixing sleeve 300. The rotor core 100 is a cylindrical structure. Multiple limiting grooves 110 are provided on the outer periphery of the rotor core 100. The multiple limiting grooves 110 are arranged in a ring at intervals and extend along the axial direction of the rotor core 100.

[0044] Multiple magnets 200 are arranged one-to-one in multiple limiting grooves 110. The two edges of the magnets 200 along the circumferential direction of the rotor core 100 abut against the two side walls of the limiting grooves 110 to achieve circumferential positioning of the magnets 200.

[0045] The fixing sleeve 300 is fitted around the outer periphery of the rotor core 100, and the inner peripheral wall of the fixing sleeve 300 abuts against the outer wall of the magnet body 200 to achieve radial positioning of the magnet body 200.

[0046] This invention uses the two side walls of the limiting groove 110 to abut against the two edges of the magnet body 200 along the circumference of the rotor core 100, thereby circumferentially positioning and fixing the magnet body 200. The fixing sleeve 300 holds the magnet body 200 tightly to the outer circumference of the rotor core 100, thereby radially positioning and fixing the magnet body 200. In this invention, the magnet body 200 no longer has a part extending into the limiting groove 110. The limiting groove 110 only serves the function of circumferential positioning and assists in the installation of the magnet body 200, which significantly reduces magnetic leakage, improves output torque, reduces torque pulsation, and improves magnet utilization.

[0047] The optimized limiting groove 110 no longer needs to withstand the radial centrifugal force of the magnet 200 and has almost no strength requirements, so its shape can be flexibly designed according to actual needs.

[0048] Neodymium iron boron (NdFeB) material has extremely strong magnetic force. The magnet body 200 is made of NdFeB material. However, NdFeB material is hard and brittle. If there are sharp corners, it is easy to break during assembly, causing additional losses. In this embodiment, the magnet body 200 has two convex rounded corner structures on both edges along the circumference of the rotor core 100, which eliminates the need for assembly. Therefore, it reduces assembly losses, reduces processing precision, and further reduces costs.

[0049] Furthermore, in this embodiment, the two side walls of the limiting groove 110 along the circumference of the rotor core 100 are both concave rounded corner structures, which makes the two edges of the magnet body 200 more closely contact the two side walls of the limiting groove 110, and the force is more uniform, thereby improving the stability of the circumferential positioning of the magnet body 200.

[0050] In this embodiment, the cross-section of the magnet body 200 is arc-shaped, and the cross-section of the limiting groove 110 is an arc groove structure. This allows the magnet body 200 to be laid on a larger area around the rotor core 100, thereby improving the motor efficiency.

[0051] In this embodiment, the fixing sleeve 300 is a steel component, which improves the structural strength of the fixing sleeve 300.

[0052] Furthermore, multiple limiting slots 110 are arranged at equal intervals on the outer periphery of the rotor core 100, making the power output of the motor more stable.

[0053] like Figure 1 and Figure 2 As shown, this utility model also provides a rotor assembly 600, including a magnet mounting and fixing structure 500 and a rotor shaft 400, with a rotor core 100 fixing sleeve 300 disposed on the outer periphery of the rotor shaft 400.

[0054] The rotor shaft 400 is fitted with at least two rotating bearings 410, and the rotor core 100 is located between two adjacent rotating bearings 410. During installation, the rotor shaft 400 is installed and fixed through the rotating bearings 410.

[0055] like Figures 5 to 7 As shown, this utility model also provides an electric motor, including a rotor assembly 600 and a stator assembly 700. The stator assembly 700 includes a stator core 710 rotatably sleeved on the outer periphery of the rotor shaft 400 and a plurality of stator windings 720 annularly spaced on the stator core 710. The stator core 710 corresponds to the rotor core 100 in position.

[0056] In some embodiments, a housing is also included, in which the stator assembly 700 is fixed and the rotor shaft 400 is mounted within the housing via a rotary bearing 410.

[0057] This invention optimizes the magnet mounting and fixing structure 500, which reduces magnetic leakage in the motor slot, lowers torque pulsation, improves motor efficiency, reduces the amount of magnets used, and reduces motor cost.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A magnet mounting and fixing structure, characterized in that, include: The rotor core (100) has multiple limiting grooves (110) arranged in a ring at intervals on its outer periphery. Multiple magnets (200) are provided, and multiple magnets (200) are provided in multiple limiting grooves (110). The two edges of the magnets (200) along the circumferential direction of the rotor core (100) abut against the two side walls of the limiting grooves (110). A fixing sleeve (300) is fitted around the outer periphery of the rotor core (100), and the inner peripheral wall of the fixing sleeve (300) abuts against the outer wall of the magnet (200).

2. The magnet mounting and fixing structure according to claim 1, characterized in that: The magnet body (200) has two convex rounded corner structures on both edges along the circumference of the rotor core (100).

3. The magnet mounting and fixing structure according to claim 2, characterized in that: The limiting groove (110) has two concave rounded corner structures on both sides of the rotor core (100) along the circumference.

4. The magnet mounting and fixing structure according to claim 1, characterized in that: The cross-section of the magnet (200) is arc-shaped, and the cross-section of the limiting groove (110) is an arc groove structure.

5. The magnet mounting and fixing structure according to claim 1, characterized in that: The fixing sleeve (300) is a steel component.

6. The magnet mounting and fixing structure according to claim 1, characterized in that: The plurality of the limiting grooves (110) are arranged at equal intervals.

7. A rotor assembly, characterized in that, The device includes the magnet mounting and fixing structure (500) as described in any one of claims 1 to 6, and also includes a rotor shaft (400), wherein the rotor core (100) fixing sleeve (300) is disposed on the outer periphery of the rotor shaft (400).

8. The rotor assembly according to claim 7, characterized in that: The rotor shaft (400) is fitted with at least two rotating bearings (410), and the rotor core (100) is located between two adjacent rotating bearings (410).

9. An electric motor, characterized in that, The rotor assembly (600) as described in any one of claims 7 to 8 is further comprising a stator assembly (700), the stator assembly (700) comprising a stator core (710) rotatably sleeved on the outer periphery of the rotor shaft (400) and a plurality of stator windings (720) annularly spaced on the stator core (710), the stator core (710) corresponding to the position of the rotor core (100).

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