Magnetic steel rotor based on surface-mounted plastic coating
By designing notches, connecting rods and positioning buckles on the plastic-covered surface, the problem of magnetic steel falling off in surface-mounted permanent magnet synchronous motors is solved, and the stable fixation of magnetic steel is achieved, and the operation reliability and life of the motor are improved.
Patent Information
- Application Number
- CN202421946910.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-08-13
AI Technical Summary
The problem of magnetic steel falling off in surface-mounted permanent magnet synchronous motors leads to unstable motor performance. Especially in harsh environments such as high temperature and high humidity, the bonding material between the magnetic steel and the rotor core may age or fail, causing the magnetic steel to fall off.
A magnetic steel rotor based on surface-mounted plastic wrap is designed. By opening notches consistent with the shape of the magnetic steel on the surface of the plastic wrap, and connecting rods and positioning buckles are provided at both ends of the plastic wrap, combined with the plastic wrap groove of the rotor core, the precise positioning and fixing of the magnetic steel is achieved, and the bonding force between the magnetic steel and the rotor core is enhanced to protect the magnetic steel from damage.
It improves the stability and reliability of magnets, reduces the risk of magnets loosening, ensures the normal operation of the motor in high speeds and harsh environments, and extends the service life.
Smart Images
Figure CN223124679U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, and particularly to a magnet rotor based on surface-mounted plastic coating. Background Technique
[0002] With the rapid development of modern motor technology, the requirements for motor performance are also increasing day by day. Especially in the field of permanent magnet brushless motors, the design of the rotor directly determines the performance and efficiency of the motor. Among them, the surface-mounted rotor structure has been widely used in industrial control and other fields due to its unique advantages, such as low manufacturing cost and small moment of inertia.
[0003] However, the problem of magnet detachment in the surface-mounted rotor structure has always been a difficult problem that plagues the performance stability of motors. In surface-mounted permanent magnet synchronous motors, the permanent magnets are usually in the shape of tiles and are located on the outer surface of the rotor core. Although this structure has many advantages, there is also a risk of magnet detachment. The main reasons for magnet detachment include: insufficient adhesion between the magnet and the rotor core, resulting in magnet detachment due to vibration during motor operation; or when the motor works in harsh environments such as high temperature and high humidity, the bonding material between the magnet and the rotor core may age or fail, resulting in magnet detachment.
[0004] Therefore, solving the problem of magnet detachment and improving the performance and reliability of motors are important problems that need to be solved urgently. Content of the Utility Model
[0005] The purpose of the utility model is to provide a magnet rotor based on surface-mounted plastic coating to solve the problems raised in the above background technique.
[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0007] The magnet rotor based on surface-mounted plastic coating includes a rotor magnetic head, a plastic coating, a magnet, a rotor core and a rotating shaft. The rotor magnetic head is fixedly installed at one end of the rotating shaft, the rotor core is fixedly installed on the outer surface of the rotating shaft, the magnet is fixedly installed on the outer surface of the rotor core, the plastic coating is nested on the outer surface of the magnet, 4 positioning buckles are added at both ends of each plastic coating groove of the rotor core, and the outer surface of the rotor core is provided with a structure that can be plastically coated.
[0008] The rotor magnetic head and the magnet generate a magnetic field and interact with the stator magnetic field to generate an electromagnetic force. The rotor core, as the main structure of the rotor, supports the magnet and transmits torque. The plastic coating protects the rotor assembly from damage. The rotating shaft connects the rotor and the external load to transmit rotational motion and torque. When the motor is powered on, the magnetic field generated by the stator interacts with the magnetic field of the magnet to generate an electromagnetic force. This electromagnetic force causes the rotor to start rotating. The relative position of the magnetic field of the rotor magnetic head and the stator magnetic field changes continuously, resulting in a continuous change in the direction of the electromagnetic force, thus enabling the rotor to rotate continuously. When the stator winding is energized to generate a magnetic field, the magnetic flux in the rotor core changes, generating an induced electromotive force and current. These currents interact with the stator magnetic field to generate an electromagnetic force to help drive the rotor to rotate.
[0009] Further, a plurality of notches having the same shape as the magnet are uniformly formed on the surface of the plastic coating. A plurality of groups of connecting rods are provided on the inner surfaces at both ends of the plastic coating, and the inner surfaces at both ends of the plastic coating are fixedly connected by the plurality of groups of connecting rods. The plurality of groups of connecting rods are arranged parallel to the center of the notches.
[0010] The design of the notches is to match the shape of the magnet to ensure that the magnet can be accurately inserted into the notches, realizing the tight combination of the plastic coating and the magnet. Through the matching of the notches and the magnet, the accurate positioning and fixation of the magnet are achieved, ensuring the stability and reliability of the magnet in the plastic coating and preventing the magnet from detaching during the operation of the rotor. The design of the connecting rods is to further fix the magnet, thereby improving the stability of the magnet during operation.
[0011] Further, a plurality of rectangular process grooves are uniformly formed on both end faces of the plastic coating, and a rotor sheath is nested on the outer surface of the plastic coating.
[0012] To adapt to some special occasions, the rotor needs to operate at high speeds. The rotor sheath is riveted to the outer circle of the rotor magnet to protect the magnet from being directly affected or damaged by the external environment, thereby ensuring the normal operation of the motor and extending its service life.
[0013] Further, the types of the magnets include parallel magnets, tile-shaped magnets, and bread-shaped magnets.
[0014] To be applicable to different motor application scenarios, when selecting the shape of the magnet, the staff can make corresponding selections according to the specific requirements, performance requirements, and cost considerations of the motor.
[0015] Further, a plurality of plastic coating grooves are uniformly formed on the outer surface of the rotor core.
[0016] When plastic coating the magnet, a specific plastic firmly holds the magnet on the surface of the rotor core, making it an integral part with the rotor core, improving production efficiency and greatly reducing the risk of magnet loosening.
[0017] Further, the length of the positioning buckle is 1 / 2 of the thickness of the magnet.
[0018] In order to facilitate the fixation of the magnet while avoiding the positioning buckle being too long to block the installation and cooperation of the plastic wrapping on the magnet, which affects the fixation effect of the magnet, and also avoiding the positioning buckle being too short to effectively fix the magnet, which affects the stability of the magnet during rotation.
[0019] Further, the N poles and S poles of two adjacent magnets are arranged alternately.
[0020] The alternating arrangement of N poles and S poles can ensure the uniform distribution of the magnetic field on the rotor, reduce the fluctuation and distortion of the magnetic field, thereby ensuring the stability and reliability of the motor during operation.
[0021] Further, the number of the magnets is an even number.
[0022] The even number of magnets is for achieving uniform magnetic field distribution, improving torque stability and reducing noise, while the odd number of magnets cannot achieve these effects.
[0023] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: The present utility model evenly opens a plurality of notches on the surface of the plastic wrapping, which are consistent with the shape of the magnet. Through the matching of the notches and the magnet, accurate positioning and fixation of the magnet are achieved, ensuring the stability and reliability of the magnet in the plastic wrapping. By arranging multiple groups of connecting rods on the inner surfaces at both ends of the plastic wrapping, the magnet is further fixed, thereby improving the stability of the magnet during operation. By evenly opening a plurality of plastic wrapping grooves on the outer surface of the rotor core, the magnet is firmly held on the surface of the rotor core with a specific plastic, making it an integral part with the rotor core, improving production efficiency, and greatly reducing the risk of magnet loosening. By adding 4 fixing buckles at both ends of each plastic wrapping groove of the rotor core, the magnet can be easily pressed into the rotor core under the pressure of the tooling while being fixed, avoiding the magnet from detaching or vibrating during the rotation of the rotor, which affects the normal operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:
[0025] Figure 1 is a schematic structural diagram of the overall appearance of the present utility model;
[0026] Figure 2 is a schematic structural diagram of the appearance of each component of the present utility model;
[0027] Figure 3 is a schematic structural diagram of the positioning buckle and plastic wrapping groove of the rotor core of the present utility model;
[0028] Figure 4 is a schematic diagram of the installation position structure of the permanent magnet and the rotor core of the present utility model;
[0029] Figure 5 is a schematic diagram of the structure of the plastic-coated rectangular process groove of the present utility model;
[0030] Figure 6 is a schematic diagram of the installation position structure of the rotor sheath of the present utility model;
[0031] In the figure: 1-rotor head, 2-plastic coating, 21-rectangular process groove, 22-rotor sheath, 3-permanent magnet, 4-rotor core, 41-plastic-coated groove, 42-positioning buckle, 5-rotating shaft. Specific embodiments
[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0033] The present utility model provides a technical solution:
[0034] As Figure 1 , 2 shown, a surface-mounted plastic-coated permanent magnet rotor includes a rotor head 1, a plastic coating 2, a permanent magnet 3, a rotor core 4 and a rotating shaft 5. The rotor head 1 is fixedly installed at one end of the rotating shaft 5, the rotor core 4 is fixedly installed on the outer surface of the rotating shaft 5, the permanent magnet 3 is fixedly installed on the outer surface of the rotor core 2, the plastic coating 2 is nested on the outer surface of the permanent magnet 3, and 4 positioning buckles 42 are added at both ends of each plastic-coated groove of the rotor core (4). The outer surface of the rotor core 4 is provided with a structure that can be plastic-coated.
[0035] The rotor head 1 and the permanent magnet 3 generate a magnetic field and interact with the stator magnetic field to generate electromagnetic force. The rotor core 4, as the main structure of the rotor, supports the permanent magnet 3 and transmits torque. The plastic coating 2 protects the rotor assembly from damage. The rotating shaft 5 connects the rotor and the external load to transmit rotational motion and torque. When the motor is powered on, the magnetic field generated by the stator interacts with the magnetic field of the permanent magnet 3 to generate electromagnetic force. This electromagnetic force causes the rotor to start rotating. The relative position of the magnetic field of the rotor head 1 and the stator magnetic field continuously changes, resulting in continuous change of the direction of the electromagnetic force, so that the rotor continues to rotate. When the stator winding is energized to generate a magnetic field, the magnetic flux in the rotor core 4 will change, generating induced electromotive force and current. These currents interact with the stator magnetic field to generate electromagnetic force, which helps to drive the rotor to rotate.
[0036] As shown Figure 2 in Figure Figure 2 , multiple notches consistent with the outer shape of the magnet steel 3 are evenly arranged on the surface of the plastic wrapping 2. Multiple groups of connecting rods are arranged on the inner surfaces at both ends of the plastic wrapping 2. The inner surfaces at both ends of the plastic wrapping 2 are fixedly connected by multiple groups of connecting rods, and the multiple groups of connecting rods are arranged at the center parallel to the notches.
[0037] The design of the notches is to match the outer shape of the magnet steel 3 to ensure that the magnet steel 3 can be accurately embedded into the notches, realizing the tight combination of the plastic wrapping 2 and the magnet steel 3. Through the matching of the notches and the magnet steel 3, the precise positioning and fixation of the magnet steel 3 are achieved, ensuring the stability and reliability of the magnet steel 3 in the plastic wrapping 2 and preventing the magnet steel 3 from detaching during the rotation of the rotor. The design of the connecting rods is to further fix the magnet steel 3, thereby improving the stability of the operation of the magnet steel 3.
[0038] As shown Figure 5 in Figure Figure 5 , multiple rectangular process grooves 21 are evenly arranged on both end faces of the plastic wrapping 2, and a rotor sheath 22 is nested on the outer surface of the plastic wrapping 2.
[0039] To adapt to some special occasions where the rotor needs to operate at high speeds, the rotor sheath 22 is riveted to the outer circle of the magnet steel 3 to protect the magnet steel 3 from being directly affected or damaged by the external environment, thereby ensuring the normal operation of the motor and extending its service life.
[0040] As shown Figure 1 、 2 in Figure 2 , the types of the magnet steel 3 include parallel magnet steel, tile-shaped magnet steel, and bread-shaped magnet steel.
[0041] To be applicable to different motor application scenarios, when selecting the shape of the magnet steel 3, the staff can make corresponding selections according to the specific requirements, performance requirements, and cost considerations of the motor.
[0042] As shown Figure 3 in Figure Figure 3 , multiple plastic coating grooves 41 are evenly arranged on the outer surface of the rotor core 4.
[0043] When plastic coating the magnet steel 3, a specific plastic is used to firmly hold the magnet steel 3 on the surface of the rotor core 4, making it an integral whole with the rotor core 4, improving production efficiency, and greatly reducing the risk of loosening of the magnet steel 3.
[0044] As shown Figure 3 in Figure Figure 3 , the length of the positioning buckle 42 is 1 / 2 of the thickness of the magnet steel 3.
[0045] To facilitate the fixation of the magnet steel 3 while avoiding the positioning buckle 42 being too long to block the installation and cooperation of the plastic wrapping 2 with the magnet steel 3, affecting the fixation effect of the magnet steel 3, and also avoiding the positioning buckle 42 being too short to effectively fix the magnet steel 3, affecting the stability of the magnet steel 3 during rotation.
[0046] As Figure 4 shown, the 3N poles and S poles of adjacent permanent magnets are arranged alternately.
[0047] The alternating arrangement of N poles and S poles can ensure the uniform distribution of the magnetic field on the rotor, reduce the fluctuations and distortions of the magnetic field, thereby ensuring the stability and reliability during the operation of the motor.
[0048] As Figure 4 shown, the number of permanent magnets 3 is an even number.
[0049] The even number of permanent magnets 3 is for achieving uniform magnetic field distribution, improving torque stability and reducing noise, while the odd number of permanent magnets 3 cannot achieve these effects.
[0050] The working principle of the present utility model:
[0051] When the motor is powered on, the magnetic field generated by the stator interacts with the magnetic field of the permanent magnet 3 to generate an electromagnetic force. This electromagnetic force causes the rotor to start rotating. The relative position between the magnetic field of the rotor head 1 and the stator magnetic field continuously changes, resulting in the continuous change of the direction of the electromagnetic force, thereby causing the rotor to continuously rotate. When the stator winding is energized to generate a magnetic field, the magnetic flux in the rotor core 4 will change, generating an induced electromotive force and current. These currents interact with the stator magnetic field to generate an electromagnetic force to help drive the rotor to rotate.
[0052] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.
[0053] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A magnet rotor based on surface-mounted plastic coating, characterized in that: The described magnet rotor based on surface-mounted plastic coating includes a rotor magnetic head (1), plastic coating (2), a magnet (3), a rotor iron core (4), and a rotating shaft (5). The rotor magnetic head (1) is fixedly installed at one end of the rotating shaft (5). The rotor iron core (4) is fixedly installed on the outer surface of the rotating shaft (5). The magnet (3) is fixedly installed on the outer surface of the rotor iron core (4). The plastic coating (2) is nested on the outer surface of the magnet (3). Four positioning buckles (42) are additionally provided at both ends of each plastic coating groove of the rotor iron core (4). A structure for plastic coating is provided on the outer surface of the rotor iron core (4).
2. The magnetic steel rotor based on surface-mounted plastic coating according to claim 1, wherein: A plurality of notches consistent with the shape of the magnet (3) are evenly formed on the surface of the plastic coating (2). A plurality of groups of connecting rods are arranged on the inner surfaces at both ends of the plastic coating (2). The inner surfaces at both ends of the plastic coating (2) are fixedly connected by the plurality of groups of connecting rods. The plurality of groups of connecting rods are arranged parallel to the center of the notches.
3. The magnet rotor based on surface-mounted plastic coating according to claim 1, characterized in that: A plurality of rectangular process grooves (21) are evenly formed on both end faces of the plastic coating (2). A rotor sheath (22) is nested on the outer surface of the plastic coating (2).
4. A magnet rotor based on surface-mounted plastic coating according to claim 1, characterized in that: The types of the magnet (3) include parallel magnets, tile-shaped magnets, and bread-shaped magnets.
5. A magnet rotor based on surface-mounted plastic coating according to claim 1, characterized in that: A plurality of plastic coating grooves (41) are evenly formed on the outer surface of the rotor iron core (4).
6. A magnet rotor based on surface-mounted plastic coating according to claim 1, characterized in that: The length of the positioning buckle (42) is 1 / 2 of the thickness of the magnet (3).
7. A magnet rotor based on surface-mounted plastic coating according to claim 1, characterized in that: The N poles and S poles of two adjacent magnets (3) are arranged alternately.
8. A magnet rotor based on surface-mounted plastic coating according to claim 1, characterized in that: The number of the magnets (3) is an even number.