Motor rotor with double magnetic rings

Abstract

The utility model discloses a motor rotor with double magnetic rings, which comprises a motor rotor body and two magnetic rings, and is characterized in that the motor rotor body comprises a base and a shaft body connected with the base; the two magnetic rings sleeve the outer side of the top and the outer side of the bottom of the base respectively, and the two magnetic rings are distributed at intervals in the axial direction of the motor rotor body; clamping structures are arranged on the outer side face of the top of the base and the outer side face of the bottom of the base. The two magnetic rings are clamped and fixed to the base through the clamping structures on the top of the base and the clamping structures on the bottom of the base respectively. Or the inner side surfaces of the two magnetic rings are provided with clamping structures, and the two magnetic rings are clamped and fixed on the base through the respective clamping structures; or the two magnetic rings are both in interference fit with the base. According to the utility model, the material consumption of magnetic materials can be reduced, the manufacturing cost is reduced, and the concentricity of the motor rotor during rotation is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotors, in particular to a motor rotor with two magnetic rings. Background Art

[0002] The motor rotor is a component in the motor that cooperates with the motor stator to achieve rotation and is one of the important components of the motor. For existing small motors such as stepping motors, neodymium iron boron materials are generally used to manufacture the magnetic part of the motor rotor. Due to the increasing price of neodymium iron boron materials, how to effectively reduce the cost of the motor rotor has become a technical problem that needs to be solved urgently in the existing technology.

[0003] For this reason, the Chinese utility model patent with the publication number CN217335237U proposes a motor rotor structure with two magnetic rings. However, in this patent document, when the product is assembled, the magnetic ring is only sleeved on the outer side of the rotor body, and the contact between the magnetic ring and the rotor body is not tight enough. After the product is formed, the magnetic ring may be eccentric or skewed relative to the rotor body, which will result in poor concentricity when the motor rotor rotates and affect the performance of the motor. Summary of the Utility Model

[0004] The utility model provides a motor rotor with two magnetic rings, which can reduce the consumption of magnetic materials, reduce the manufacturing cost, and ensure the concentricity when the motor rotor rotates.

[0005] To solve the above problems, the utility model adopts the following technical solutions:

[0006] An embodiment of the utility model provides a motor rotor with two magnetic rings, including a motor rotor body and two magnetic rings. The motor rotor body includes a base and a shaft body connected to the base; the two magnetic rings are respectively sleeved on the outer sides of the top and bottom of the base, and in the axial direction of the motor rotor body, the two magnetic rings are spaced apart.

[0007] The outer sides of the top and bottom of the base are both provided with clamping structures, and the two magnetic rings are respectively clamped and fixed on the base through the clamping structures on the top of the base and the clamping structures on the bottom of the base; alternatively, the inner sides of the two magnetic rings are both provided with clamping structures, and the two magnetic rings are both clamped and fixed on the base through their respective clamping structures; alternatively, the two magnetic rings are both in interference fit with the base.

[0008] In some embodiments, an axial limiting structure is provided on the base, and the axial limiting structure is used to limit the axial movement of the magnetic ring relative to the base along the motor rotor body.

[0009] In some embodiments, the axial limiting structure includes an upper limiting ring disposed on the top of the base, a lower limiting ring disposed on the bottom of the base, and a limiting member disposed on the circumferential surface of the base; the upper limiting ring is located on the top of the magnetic ring at the top of the base, the lower limiting ring is located on the bottom of the magnetic ring at the bottom of the base, the limiting member is located between the two magnetic rings, the upper limiting ring and the limiting member clamp the magnetic ring at the top of the base, and the lower limiting ring and the limiting member clamp the magnetic ring at the bottom of the base.

[0010] In some embodiments, the magnetic ring has a central hole that forms an annular structure. The central hole of the magnetic ring at the top of the base forms an expanded opening on its top surface, and the central hole of the magnetic ring at the bottom of the base forms an expanded opening on its bottom surface. The inner diameter of the expanded opening is greater than the inner diameter of the central hole, and the upper limiting ring and the lower limiting ring are respectively embedded in the expanded openings of the two magnetic rings.

[0011] In some embodiments, the central hole forms the expanded openings on both the top surface and the bottom surface of the magnetic ring. In the direction of extending axially and outward along the magnetic ring, the inner diameter of the expanded opening gradually increases.

[0012] In some embodiments, a circumferential limiting member is provided on the base, and the magnetic ring is provided with a docking structure adapted to the circumferential limiting member. The circumferential limiting member is docked with the docking structure to limit the rotation of the magnetic ring relative to the base around the axis of the motor rotor body.

[0013] In some embodiments, the circumferential limiting member includes a plurality of insertion blocks provided on the circumferential surface of the base, and the docking structure includes insertion grooves provided on the inner side surface of the magnetic ring and adapted to the insertion blocks. The insertion blocks are inserted into the insertion grooves.

[0014] In some embodiments, a jack coaxial with the shaft body is provided on the bottom surface of the motor rotor body. The jack includes a receiving portion and a plugging portion. The plugging portion is located above the receiving portion, and the inner diameter of the receiving portion is greater than the inner diameter of the plugging portion.

[0015] In some embodiments, the jack further includes a guiding portion. The guiding portion is provided between the receiving portion and the plugging portion and is respectively connected to the receiving portion and the plugging portion. In the upward extending direction, the inner diameter of the guiding portion gradually decreases.

[0016] In some embodiments, the base is provided with a through hole axially penetrating itself along the motor rotor body. The shaft body extends into the through hole. A connecting member is provided on the inner wall of the through hole. The connecting member is connected to the shaft body, and the jack is provided on the bottom surface of the shaft body.

[0017] In some embodiments, the clamping structure is a plurality of bumps, protrusions or teeth distributed circumferentially along the motor rotor body, or the clamping structure is a convex ring coaxially provided with the motor rotor body.

[0018] The utility model has at least the following beneficial effects: The utility model uses two magnetic rings, both of which are sleeved on the base of the motor rotor body. Axially on the motor rotor body, the two magnetic rings are spaced apart. Compared with the magnetic ring structure that covers the entire circumferential surface of the base in the prior art, the utility model can reduce the consumption of magnetic materials such as neodymium iron boron, thereby reducing the manufacturing cost. At the same time, the magnetic ring is fixedly connected to the base through a clamping structure or the magnetic ring and the base are in interference fit to be fixedly connected to the base by clamping. In this way, the magnetic ring can be fastened to the base. When the product is formed, the magnetic ring is not easy to be eccentric or skewed relative to the rotor body, and the concentricity between the magnetic ring and the motor rotor body is higher, which ensures the concentricity when the motor rotor rotates and improves the performance of the motor. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a motor rotor with double magnetic rings according to an embodiment of the utility model;

[0020] Figure 2 It is a cross-sectional view of a motor rotor with double magnetic rings according to an embodiment of the utility model;

[0021] Figure 3 It is a schematic structural diagram of a magnetic ring according to an embodiment of the utility model;

[0022] Figure 4 It is a cross-sectional view of a magnetic ring according to an embodiment of the utility model;

[0023] Figure 5 It is a schematic structural diagram of a motor rotor body according to an embodiment of the utility model;

[0024] Figure 6 It is a cross-sectional view of a motor rotor body according to an embodiment of the utility model.

[0025] Among them, the reference numerals are:

[0026] Motor rotor body 100, base 110, through hole 111, connecting piece 112, connecting plate 113, shaft body 120, jack 121, plugging part 122, accommodating part 123, guiding part 124, convex tooth 125, circumferential limiting part 130, upper limiting ring 141, lower limiting ring 142, limiting part 150;

[0027] Magnetic ring 200, alignment structure 210, central hole 220, expanded opening 230. Detailed Embodiment

[0028] The present utility model provides the following description with reference to the accompanying drawings to assist in a comprehensive understanding of various embodiments of the present utility model as defined by the claims and their equivalents. The description includes various specific details to facilitate understanding, but these details should be regarded as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present utility model.

[0029] In the description of the present utility model, reference is made to orientation descriptions, such as the upper, lower, front, rear, left, right, etc. The orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0030] It should be understood that when an element (e.g., the first element) is "connected" to another element (e.g., the second element), the element can be directly connected to the other element, or there can be an intermediate element (e.g., the third element) between the element and the other element.

[0031] An embodiment of the present utility model provides a motor rotor with double magnetic rings, as Figure 1-6 shown, including a motor rotor body 100 and two magnetic rings 200. The motor rotor body 100 includes a base 110 and a shaft body 120 connected to the base 110. The main shape of the base 110 can be cylindrical, having a circumferential surface and two end faces. The shaft body 120 can be coaxially arranged with the base 110, and the axis of the shaft body 120 is the axis of the entire motor rotor body 100. The shaft body 120 can be fixed on the base 110 or integrally formed with the base 110. Preferably, the shaft body 120 and the base 110 are integrally formed to facilitate the manufacturing and forming of the entire motor rotor body 100 and also improve the connection strength between the shaft body 120 and the base 110.

[0032] Two magnetic rings 200 are respectively sleeved on the outer sides of the top and bottom of the base 110, and in the axial direction of the motor rotor body 100, the two magnetic rings 200 are spaced apart, that is, the two magnetic rings 200 are spaced apart by a preset distance, and this preset distance is determined by those skilled in the art according to the actual situation. Thus, compared with the existing motor rotor, the magnetic rings in this embodiment do not need to cover the entire outer peripheral surface of the base, which can significantly reduce the consumption of magnetic materials such as neodymium iron boron, thereby reducing the manufacturing cost of the entire motor rotor, increasing the torque, and reducing the comprehensive noise of the motor. At the same time, since the two magnetic rings 200 are spaced apart, when the entire motor rotor rotates, there is air flowing between the two magnetic rings 200, which will reduce the temperature rise of the motor rotor. In addition, the magnetic force lines of magnetic materials have the characteristics of superposition or tending to both ends. If there is a connecting body in the middle, in fact, the magnetic force line density in the middle is the smallest and the largest at both ends. The two magnetic rings 200 in this embodiment are spaced apart and there is no connecting body in the middle, and the entire magnetic force line density will be distributed on the two magnetic rings, which can increase the surface magnetism and improve the magnetic field efficiency.

[0033] The motor rotor body 100 is usually made of plastic, and the magnetic ring 200 is mainly made of neodymium iron boron. Both have a certain degree of deformation characteristics. The deformation characteristics of the materials can be utilized to make the two magnetic rings 200 have an interference fit with the base 110, so as to clamp and fix the two magnetic rings 200 on the base 110. This can ensure that the magnetic ring 200 can maintain a high concentricity with the motor rotor body 100 during assembly. During subsequent forming processes such as hot melting treatment of the motor rotor body 100, the magnetic ring 200 is not easily eccentric or skewed relative to the rotor body 100, and the concentricity between the magnetic ring 200 and the motor rotor body 100 is higher, which ensures the concentricity during the rotation of the motor rotor and improves the performance of the motor.

[0034] In some other embodiments, clamping structures are provided on the outer side surfaces of the top and bottom of the base 110. The two magnetic rings 200 are respectively clamped and fixed on the base 110 through the clamping structure on the top of the base 110 and the clamping structure on the bottom of the base 110, so as to also be able to clamp and fix the two magnetic rings 200 on the base 110, ensuring the concentricity during the rotation of the motor rotor and improving the performance of the motor.

[0035] Further, the clamping structure is a plurality of bumps, protrusions or convex teeth provided on the circumferential surface of the base 110 and distributed along the circumferential direction of the motor rotor body 100. Preferably, the bumps, protrusions or convex teeth should be evenly distributed to provide a uniform clamping force. Or, the clamping structure is a convex ring provided on the circumferential surface of the base 110 and coaxially arranged with the motor rotor body 100, and the magnetic ring 200 is clamped by the convex ring.

[0036] In still other embodiments, the inner sides of both magnetic rings 200 are provided with clamping structures, and both magnetic rings 200 are clamped and fixed to the base 110 through their respective clamping structures, thereby also being able to clamp and fix both magnetic rings 200 to the base 110, ensuring the concentricity during the rotation of the motor rotor and improving the performance of the motor.

[0037] Further, the clamping structure is a plurality of bumps, protrusions or convex teeth provided on the inner side of the magnetic ring 200 and distributed circumferentially along the motor rotor body 100. Preferably, the bumps, protrusions or convex teeth should be evenly distributed to provide a uniform clamping force. Alternatively, the clamping structure is a convex ring provided on the inner side of the magnetic ring 200 and coaxially arranged with the motor rotor body 100, and the magnetic ring 200 is clamped by the convex ring.

[0038] In some embodiments, an axial limiting structure is provided on the base 110. The axial limiting structure is used to limit the axial movement of the magnetic ring 200 relative to the base 110 along the motor rotor body 100, so that the magnetic ring 200 can maintain its position in the axial direction and can be more firmly fixed to the base 110.

[0039] In some embodiments, the axial limiting structure includes an upper limiting ring 141 provided on the top of the base 110, a lower limiting ring 142 provided on the bottom of the base 110, and a limiting member 150 provided on the circumferential surface of the base 110. The upper limiting ring 141 is located on the top of the magnetic ring 200 at the top of the base 110, the lower limiting ring 142 is located on the bottom of the magnetic ring 200 at the bottom of the base 110, and the limiting member 150 is located between the two magnetic rings 200. The upper limiting ring 141 and the limiting member 150 clamp the magnetic ring 200 at the top of the base 110, and the lower limiting ring 142 and the limiting member 150 clamp the magnetic ring 200 at the bottom of the base 110, so that neither of the two magnetic rings 200 can move axially relative to the base 110 along the motor rotor body 100, playing a limiting role.

[0040] In this embodiment, the limiting member 150 can be fixed to the circumferential surface of the base 110 or integrally formed with the base 110. The limiting member 150 can include a plurality of protrusions protruding from the circumferential surface of the base 110. The protrusions abut against the bottom surface of the magnetic ring 200 at the top of the base 110 and also abut against the top surface of the magnetic ring 200 at the bottom of the base 110. Preferably, the protrusions are evenly distributed circumferentially along the motor rotor body 100 to provide a relatively uniform abutting force. The limiting member 150 can also be a convex ring surrounding the circumferential surface of the base 110. The convex ring is coaxially arranged with the base 110, and the convex ring abuts against the bottom surface of the magnetic ring 200 at the top of the base 110 and also abuts against the top surface of the magnetic ring 200 at the bottom of the base 110 to play a better limiting role.

[0041] Considering that two magnetic rings 200 are to be sleeved on the base 110, the upper limit ring 141 and the lower limit ring 142 in this embodiment are formed after the two magnetic rings 200 are sleeved on the base 110, so as not to affect the sleeving of the magnetic rings 200. Specifically, the end face of the base 110 can be subjected to hot melt treatment to form the upper limit ring 141 and the lower limit ring 142, or the upper limit ring 141 and the lower limit ring 142 can be fixed on the base 110.

[0042] Furthermore, the magnetic ring 200 has a central hole 220 that forms an annular structure. The central hole 220 penetrates through the magnetic ring 200 to make it an annular structure. The central hole 220 of the magnetic ring 200 located at the top of the base 110 forms an expansion opening 230 on the top surface of the magnetic ring 200, and the central hole 220 of the magnetic ring 200 located at the bottom of the base 110 forms an expansion opening 230 on the bottom surface of the magnetic ring 200. The inner diameters of the expansion openings 230 of the two magnetic rings 200 are both larger than the inner diameter of their respective central holes 220, and the upper limit ring 141 and the lower limit ring 142 are respectively embedded in the expansion openings 230 of the two magnetic rings 200.

[0043] This makes it difficult for the upper limit ring 141 to protrude from the top surface of the magnetic ring 200 located at the top of the base 110, and it is difficult for the lower limit ring 142 to protrude from the bottom surface of the magnetic ring 200 located at the bottom of the base 110, reducing the impact on the rotational performance of the entire motor rotor. At the same time, when the end face of the base 110 is subjected to hot melt treatment, the hot melt adhesive is easy to flow into the expansion opening 230, and then can be tightly combined with the magnetic ring 200.

[0044] Furthermore, the central hole 220 forms expansion openings 230 on both the top surface and the bottom surface of the magnetic ring 200. When installing the two magnetic rings 200, there is no need to consider the front and back of the magnetic rings 200, and the operation is simpler. In the direction along the axial direction of the magnetic ring 200 and extending outward, the inner diameter of the expansion opening 230 gradually increases. Since the magnetic ring 200 is fixed on the base 110 through a clamping structure or the magnetic ring 200 is in interference fit with the base 110, this will cause the size of at least part of the base 110 to be larger than the size of the central hole 220. Through the expansion opening 230 with a gradually increasing inner diameter, the magnetic ring 200 is easier to be sleeved on the base 110, and it plays a certain guiding role for the magnetic ring 200, enabling the magnetic ring 200 to be gradually sleeved in place.

[0045] In some other embodiments, the axial limiting structure includes a convex block provided on the circumferential surface of the base 110, and a groove adapted to the convex block is provided on the inner side surface of the magnetic ring 200. The convex block is embedded in the groove, which can also limit the axial movement of the magnetic ring 200 relative to the base 110 along the motor rotor body 100.

[0046] In some embodiments, a circumferential limiting member 130 is provided on the base 110, and the magnetic ring 200 is provided with a docking structure 210 adapted to the circumferential limiting member 130. The circumferential limiting member 130 is docked with the docking structure 210 to limit the magnetic ring 200 from rotating relative to the base 110 around the axis of the motor rotor body 100, so as to further enable the magnetic ring 200 to maintain its position on the base 110, and the magnetic ring 200 can be more firmly fixed on the base 110.

[0047] Further, the circumferential limiting member 130 includes a plurality of inserts provided on the circumferential surface of the base 110, and the docking structure 210 includes insertion grooves provided on the inner side surface of the magnetic ring 200 and adapted to the inserts. The inserts are inserted into the insertion grooves, and the cooperation between the inserts and the insertion grooves is used to limit the magnetic ring 200 from rotating relative to the base 110.

[0048] In this embodiment, after the magnetic ring 200 is sleeved on the base 110, the base 110 can be subjected to hot melt treatment to form inserts, which are inserted into the insertion grooves. The insertion grooves can extend to the end surface of the magnetic ring 200. When the base 110 is hot melted, the adhesive is more likely to flow into the insertion grooves, so as to more easily form inserts.

[0049] In other embodiments, the circumferential limiting member 130 may include a cover plate and positioning posts fixed to the cover plate. The end surface of the magnetic ring 200 is provided with positioning holes adapted to the positioning posts. The cover plate is arranged outside the end surface of the magnetic ring 200, and the positioning posts are inserted into the positioning holes to limit the magnetic ring 200 from rotating relative to the base 110.

[0050] In some embodiments, a jack 121 coaxial with the shaft body 120 is provided on the bottom surface of the motor rotor body 100. The jack 121 includes a receiving portion 123 and a plugging portion 122. The plugging portion 122 is located above the receiving portion 123, and the inner diameter of the receiving portion 123 is larger than the inner diameter of the plugging portion 122. When assembling the motor, the rotor shaft on the motor housing is inserted into the jack 121 to position the entire motor rotor. In order to increase the smoothness of rotation, lubricating oil is applied to the bottom surface of the motor rotor body 100. Since the inner diameter of the receiving portion 123 is larger than the inner diameter of the plugging portion 122, a larger gap is left between the inner wall of the receiving portion 123 and the rotor shaft, and the lubricating oil can be stored in the receiving portion 123 to accommodate more lubricating oil and provide a longer lubricating effect.

[0051] Further, the jack 121 further includes a guiding portion 124 disposed between the accommodating portion 123 and the plugging portion 122. The guiding portion 124 is respectively connected to the accommodating portion 123 and the plugging portion 122. In the upward extending direction, the inner diameter of the guiding portion 124 gradually decreases, which makes the lubricating oil in the accommodating portion 123 more easily flow through the guiding portion 124 to the plugging portion 122, so as to be applied to the rotor shaft to ensure the lubrication effect. At the same time, on the basis of this design, the outer diameter of the shaft body 120 can be reduced, which is convenient for the heat dissipation of the motor rotor and reduces the thermal loss of the magnet.

[0052] Furthermore, the base 110 is provided with a perforation 111 that axially penetrates itself along the motor rotor body 100. The shaft body 120 extends into the perforation 111. A connecting member 112 is disposed on the inner wall of the perforation 111. The connecting member 112 is connected to the shaft body 120. The jack 121 is disposed on the bottom surface of the shaft body 120. On the premise of ensuring the structural strength, this structure can reduce the material used for the motor rotor body 100 and reduce the manufacturing cost.

[0053] In this embodiment, the connecting member 112 may be a connecting strip extending along the axial direction of the shaft body 120. The two sides of the connecting strip are respectively connected to the outer side surface of the shaft body 120 and the perforation 111. A connecting plate 113 may further be disposed on the inner wall of the perforation 111. The connecting plate 113 is also connected to the shaft body 120 to further strengthen the connection between the shaft body 120 and the base 110. At the same time, the connecting plate 113 can partition the perforation 111 to reduce the lubricating oil on the bottom surface of the motor rotor body 100 from entering the perforation 111. Both the connecting member 112 and the connecting plate 113 can be integrally formed with the base 110 for easy manufacturing.

[0054] In some embodiments, a plurality of convex teeth 125 are evenly disposed on the circumferential surface of the shaft body 120. The convex teeth 125 can be engaged with a gear. When the entire motor rotor rotates, the driving force is transmitted through this engagement relationship.

[0055] In some embodiments, in the axial direction of the motor rotor body 100, the distance between the end faces of the two magnetic rings 200 facing away from each other may be 5.28 mm, and the distance between the end faces of the two magnetic rings 200 facing each other may be 1.2 mm.

[0056] An embodiment of the present utility model provides a forming method for a motor rotor with a double magnetic ring as described in any one of the above. For the specific structure of the motor rotor with a double magnetic ring, reference may be made to the above embodiments and will not be elaborated herein. The forming method includes the following steps:

[0057] (1) Sleeving the two magnetic rings on the outer sides of the top and bottom of the base respectively.

[0058] It can be manually operated by workers to complete the assembly of two magnetic rings, or corresponding automated equipment can be developed to respectively socket the two magnetic rings on the outer sides of the top and bottom of the base. After being socketed in place, the magnetic rings can be clamped and fixed on the base through a clamping structure or clamped and fixed on the base through interference fit.

[0059] (2) Perform hot melting treatment on both end faces of the base so that both magnetic rings are fastened to the base;

[0060] Since the base is usually made of plastic, after the end face of the base is subjected to hot melting treatment, the end position of the base will be melted into molten rubber. When there are holes or grooves on the magnetic ring, the rubber will fill these holes or grooves and then come into close contact with the magnetic ring. After the rubber cools and solidifies, both magnetic rings can be fastened to the base. The processes of hot melting treatment include but are not limited to ultrasonic hot melting and local baking.

[0061] (3) Use a magnetizing device to magnetize both magnetic rings.

[0062] The formed magnetic ring has no magnetic poles. After the magnetizing device magnetizes the magnetic ring, the magnetic ring has multiple magnetic poles, so that it can cooperate with the stator to realize the rotation of the motor rotor.

[0063] In some embodiments, the motor rotor body can be integrally injection-molded by an injection molding process; the forming of the magnetic ring can include the following steps: putting the configured magnetic powder into a forming mold and performing hot pressing treatment on the magnetic powder in the forming mold through a hot pressing forming device, and then the magnetic ring can be made.

[0064] In some embodiments, the magnetic ring in step (1) has a central hole that forms an annular structure. The central hole of the magnetic ring located at the top of the base forms an expanded opening on its top surface, and the central hole of the magnetic ring located at the bottom of the base forms an expanded opening on its bottom surface. The inner diameter of the expanded opening is larger than the inner diameter of the central hole; when performing step (2), the molten rubber will flow into the expanded opening, so as to form an upper limit ring at the top of the base and a lower limit ring at the bottom of the base. The upper limit ring and the lower limit ring are respectively embedded in the expanded openings of the two magnetic rings. Thus, the upper limit ring and the limiting member clamp the magnetic ring at the top of the base, and the lower limit ring and the limiting member clamp the magnetic ring at the bottom of the base, so that neither of the two magnetic rings can move axially relative to the base along the motor rotor body 100.

[0065] In some embodiments, the inner side surface of the magnetic ring in step (1) is provided with an embedded groove; when performing step (2), the molten rubber will flow into the embedded groove, so as to form an embedded block. The embedded block is inserted into the embedded groove, and the cooperation between the embedded block and the embedded groove is used to limit the rotation of the magnetic ring relative to the base.

[0066] To further illustrate the technical effects of the present utility model, a comparative experiment was conducted between the motor rotor of the present utility model and the motor rotor in the prior art. Among them, the magnetic ring of the motor rotor in the prior art covers the entire circumferential surface of the base.

[0067] Experiment 1: Use a magnetic field strength measuring instrument to measure the magnetic field strength of the motor rotor of the present utility model and the motor rotor in the prior art. Under the same conditions, the measured magnetic field strength of the motor rotor of the present utility model is 1700 GS, while the magnetic field strength of the motor rotor in the prior art is 1500 GS. Therefore, the motor rotor of the present utility model has a greater magnetic field strength.

[0068] Experiment 2: Use a torque measuring device to measure the torque of the motor rotor of the present utility model and the motor rotor in the prior art. The measurement conditions are a voltage of 5 V, a frequency of 400 Hz, and a series resistance of 18 ohms. Under the same conditions, the torque of the motor rotor of the present utility model is 980 g.cm, while the torque of the motor rotor in the prior art is 900 g.cm. Therefore, the motor rotor of the present utility model has a greater torque.

[0069] Experiment 3: Use a sound level meter to measure the noise during the operation of the motor rotor of the present utility model and the motor rotor in the prior art. Under the same conditions, at a distance of 10 cm from the measurement target, the measured noise of the motor rotor of the present utility model is 28 - 32 dB, while the noise of the motor rotor in the prior art is 32 - 35 dB. Therefore, the motor rotor of the present utility model has a lower noise.

[0070] The terms and words used in the above description and claims are not limited to their literal meanings, but are only used by the applicant to enable a clear and consistent understanding of the present utility model. Therefore, those skilled in the art should clearly understand that the above description of various embodiments of the present utility model is only for illustration, and not for limiting the present utility model as defined by the appended claims and their equivalents.

Claims

1. A motor rotor with double magnetic rings, characterized in that: The motor rotor body comprises a motor rotor body and two magnetic rings, wherein the motor rotor body comprises a base and a shaft body connected to the base; the two magnetic rings are respectively sleeved on the outer side of the top and the outer side of the bottom of the base, and the two magnetic rings are spaced apart in the axial direction of the motor rotor body; The outer side surfaces of the top and the bottom of the base are both provided with a clamping structure, and the two magnetic rings are clamped and fixed on the base by the clamping structure on the top and the clamping structure on the bottom of the base respectively; or, the inner side surfaces of the two magnetic rings are both provided with a clamping structure, and the two magnetic rings are clamped and fixed on the base by their respective clamping structures; or, the two magnetic rings are both interference fit with the base.

2. The motor rotor with double magnetic rings according to claim 1 is characterized in that: The base is provided with an axial limiting structure, and the axial limiting structure is used to limit the axial movement of the magnetic ring relative to the base along the motor rotor body.

3. The motor rotor with double magnetic rings according to claim 2 is characterized in that: The axial limiting structure includes an upper limiting ring arranged at the top of the base, a lower limiting ring arranged at the bottom of the base, and a limiting member arranged on the circumferential surface of the base; the upper limiting ring is located at the top of the magnetic ring at the top of the base, the lower limiting ring is located at the bottom of the magnetic ring at the bottom of the base, the limiting member is located between the two magnetic rings, the upper limiting ring and the limiting member clamp the magnetic ring at the top of the base, and the lower limiting ring and the limiting member clamp the magnetic ring at the bottom of the base.

4. The motor rotor with double magnetic rings according to claim 3 is characterized in that: The magnetic ring has a center hole that forms an annular structure. The center hole of the magnetic ring located at the top of the base forms an expansion opening on its top surface, and the center hole of the magnetic ring located at the bottom of the base forms an expansion opening on its bottom surface. The inner diameter of the expansion opening is larger than the inner diameter of the center hole. The upper limit ring and the lower limit ring are respectively embedded in the expansion openings of the two magnetic rings.

5. The motor rotor with double magnetic rings according to claim 4 is characterized in that: The center hole forms the expansion opening on both the top and bottom surfaces of the magnetic ring, and the inner diameter of the expansion opening gradually increases in the direction extending outward along the axial direction of the magnetic ring.

6. The motor rotor with double magnetic rings according to claim 1, characterized in that: The base is provided with a circumferential limiter, the magnetic ring is provided with a positioning structure matched with the circumferential limiter, and the circumferential limiter is docked with the positioning structure to limit the rotation of the magnetic ring relative to the base around the axis of the motor rotor body.

7. The motor rotor with double magnetic rings according to claim 6 is characterized in that: The circumferential limiting member includes a plurality of embedded blocks arranged on the circumferential surface of the base, and the alignment structure includes embedded grooves arranged on the inner side of the magnetic ring and adapted to the embedded blocks, and the embedded blocks are inserted in the embedded grooves.

8. The motor rotor with double magnetic rings according to claim 1 is characterized in that: The bottom surface of the motor rotor body is provided with a socket coaxial with the shaft body, and the socket includes a receiving portion and a plug-in portion, the plug-in portion is located above the receiving portion, and the inner diameter of the receiving portion is larger than the inner diameter of the plug-in portion.

9. The motor rotor with double magnetic rings according to claim 8, characterized in that: The jack further comprises a guide portion, which is arranged between the accommodating portion and the plug-in portion, and is connected to the accommodating portion and the plug-in portion respectively. In the direction of extending upward, the inner diameter of the guide portion gradually decreases.

10. The motor rotor with double magnetic rings according to claim 9, characterized in that: The base is provided with a through hole penetrating the motor rotor body in the axial direction, the shaft body extends into the through hole, the inner wall of the through hole is provided with a connecting piece, the connecting piece is connected to the shaft body, and the jack is provided on the bottom surface of the shaft body.

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