Anti-vibration rotor assembly

Abstract

The utility model discloses an anti-vibration rotor assembly, which comprises a rotor structure and a rotating shaft inserted in the rotor structure, and is characterized in that the rotor structure comprises a plurality of groups of circumferentially distributed rotor iron cores, a plurality of groups of circumferentially distributed permanent magnets, a plastic layer for insulation and a rotor inner iron core for fixing the rotating shaft; the plurality of groups of rotor cores and the plurality of groups of permanent magnets are distributed at intervals, the plurality of groups of rotor cores and the plurality of groups of permanent magnets are embedded in the plastic layer, and the rotor inner core is sleeved in the plastic layer. According to the utility model, the plastic layer is stable in a high-temperature environment and is easy to process and form, motor rotor parts in various shapes are manufactured through injection molding and other processes, the connection tightness between the rotor iron core and the permanent magnet and the plastic layer is ensured, in addition, the motor rotor has good electrical insulation performance, and the electrical safety of the motor rotor can be ensured; the permanent magnet is limited through the first clamping block and the second clamping block, and under the action of centrifugal force, the permanent magnet is prevented from displacing or falling off in the rotating process.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotors, in particular to a vibration-proof rotor assembly. Background Technique

[0002] Permanent magnet synchronous motors have the characteristics of high efficiency, high power density, and fast response, and are widely used in the field of household appliances. The rotor structures of permanent magnet synchronous motors are mainly divided into two categories, namely surface type and built-in type. Among them, the built-in type is that the permanent magnets are embedded in the surface grooves of the rotor core. Compared with the surface-mounted structure, it provides better protection for the permanent magnets. The inserted structure can improve the field-weakening ability of the motor to a certain extent, but the manufacturing cost is relatively high.

[0003] An existing built-in rotor structure is that the permanent magnets are directly embedded inside the rotor core, which may result in relatively poor mechanical strength of the rotor. When the motor runs at high speed or bears a large load, the rotor may be subjected to large mechanical stresses and vibrations, thereby increasing the risk of rotor damage. Therefore, when designing a built-in permanent magnet synchronous motor, it is necessary to fully consider the mechanical strength problem of the rotor and take necessary strengthening measures. Content of the Utility Model

[0004] The purpose of the utility model is to provide a vibration-proof rotor assembly to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the utility model provides the following technical solution: a vibration-proof rotor assembly, including a rotor structure and a rotating shaft inserted therein. The rotor structure includes multiple groups of rotor cores distributed circumferentially, multiple groups of permanent magnets distributed circumferentially, a plastic layer for insulation, and a rotor inner core for fixing the rotating shaft.

[0006] Multiple groups of the rotor cores and multiple groups of the permanent magnets are distributed at intervals, and multiple groups of the rotor cores and multiple groups of the permanent magnets are embedded in the plastic layer, and the rotor inner core is sleeved inside the plastic layer.

[0007] Further, multiple groups of circumferentially distributed coating layers are integrally formed inside the plastic layer. Between the coating layers with intervals, there are shaft body one and shaft body two distributed inside and outside. The shaft body one and the shaft body two are parallel to the axis of the plastic layer and are integrally provided with the plastic layer. The permanent magnets are sleeved inside the coating layers. Through holes shaft hole one and shaft hole two are provided on the outer side of the rotor core, and the shaft hole one and the shaft hole two are respectively matched with the shaft body one and the shaft body two.

[0008] Further, the rotor core is triangular. A first clamping block is integrally formed on its inner-facing edge, and a second clamping block is integrally formed on its outer-facing edge. Both sides of the rotor core are bevel edges. The permanent magnet is clamped between the two bevel edges on both sides, and the inner and outer sides of the permanent magnet are respectively clamped by the first clamping block and the second clamping block. There is a coating layer spaced between the permanent magnet and the rotor core.

[0009] Further, an outer edge layer is integrally formed on the outer side of the coating layer, and the two second clamping blocks on both sides respectively extend into the outer edge layer from both sides.

[0010] Further, a plurality of inner edge layers distributed circumferentially are integrally formed on the inner side of the plastic layer. On the outer side of the inner rotor core, a core concave edge with the same number as the inner edge layers is integrally formed. The inner edge layer extends into the core concave edge, and there is a gap between them. A high-temperature resistant rubber layer for fixing is embedded in the gap.

[0011] Further, the plastic layer is polybutylene terephthalate, which is used to isolate the permanent magnet and the rotor core.

[0012] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: The present utility model remains stable in a high-temperature environment, is easy to process and form, and can be made into various-shaped motor rotor components through processes such as injection molding, ensuring the tight connection between the rotor core, the permanent magnet, and the plastic layer. Additionally, it has good electrical insulation performance, which can ensure the electrical safety of the motor rotor; the permanent magnet is limited by the first clamping block and the second clamping block, preventing the permanent magnet from shifting or falling off during rotation under the action of centrifugal force; through the rubber layer fixed between the inner edge layer and the core concave edge, vibrations will be generated during the operation of the motor, and the rubber material can effectively absorb and disperse these vibrations, thereby protecting the rotating shaft from damage. Description of the Drawings

[0013] 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:

[0014] Figure 1 is the overall structural schematic diagram of the present utility model;

[0015] Figure 2 is the exploded structural schematic diagram of the present utility model;

[0016] Figure 3 is the structural schematic diagram of the plastic layer, the rotor core, and the permanent magnet of the present utility model;

[0017] Figure 4 is the cooperative structural schematic diagram of the plastic layer, the rotor core, and the permanent magnet of the present utility model;

[0018] Figure 5 is a partial enlarged structural schematic diagram of A in the present utility model; Figure 4 in the present utility model;

[0019] Figure 6 is a planar structural schematic diagram of the rotor core of the present utility model.

[0020] In the figure: 1. Rotor structure; 11. Plastic layer; 111. Coating layer; 112. Outer layer; 113. First shaft body; 114. Second shaft body; 115. Inner layer; 12. Rotor core; 121. First shaft hole; 122. Second shaft hole; 123. First clamping block; 124. Second clamping block; 125. Inclined edge; 13. Permanent magnet; 14. Rubber layer; 15. Inner rotor core; 151. Core recessed edge; 2. Rotating shaft. Specific embodiments

[0021] 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.

[0022] Please refer to Figures 1-6 , the present utility model provides a technical solution: The built-in rotor structure 1 can form a more complex magnetic circuit structure through the precise arrangement of the permanent magnets 13 inside the rotor core 12. This structure helps to increase the reluctance torque of the motor, improve the overload capacity and dynamic response speed of the motor. At the same time, since the permanent magnets 13 are embedded inside the rotor core 12, the magnetic field distribution generated by them is more uniform, reducing magnetic leakage and magnetic flux distortion, and improving the efficiency and power factor of the motor. However, during the operation of the motor, certain vibration effects will inevitably occur. In order to reduce the influence of the vibration effects, a vibration-proof rotor assembly is now proposed, as shown in Figure 1 and Figure 2 shown, which includes a rotor structure 1 and a rotating shaft 2 inserted therein. The rotor structure 1 includes multiple groups of rotor cores 12 distributed in a circumferential manner, multiple groups of permanent magnets 13 distributed in a circumferential manner, a plastic layer 11 for insulation, and an inner rotor core 15 for fixing the rotating shaft 2;

[0023] Multiple groups of rotor cores 12 and multiple groups of permanent magnets 13 are distributed at intervals. The multiple groups of rotor cores 12 and multiple groups of permanent magnets 13 are embedded in the plastic layer 11 for limiting the rotor cores 12 and the permanent magnets 13. And in order to prevent the magnetic flux short - circuit of the permanent magnet 13, the rotor core 12 and the permanent magnet 13 are separated by the plastic layer 11. The inner core 15 of the rotor is sleeved in the plastic layer 11. Among them, the plastic layer 11 is polybutylene terephthalate, which belongs to the polyester series. It is a milky white semi - transparent to opaque, crystalline thermoplastic polyester resin formed by polycondensation of 1,4 - butanediol and terephthalic acid or terephthalate. Its function is to have relatively high mechanical strength, be able to withstand the centrifugal force generated when the motor rotor rotates at high speed. Under long - term operation, it can maintain stable performance and is not prone to fatigue failure. Under the conditions of high temperature and high - speed operation, the size change of the plastic layer 11 is small, which is beneficial to maintaining the accuracy and stability of the motor rotor. In addition, it has good electrical insulation performance, which can ensure the electrical safety of the motor rotor.

[0024] As Figure 3 shown, in order to limit the permanent magnet 13 and the rotor core 12, multiple groups of circumferentially - distributed coating layers 111 are integrally formed inside the plastic layer 11 for coating the permanent magnet 13. Between the spaced - apart coating layers 111, there are inner - outer - distributed shaft one 113 and shaft two 114. The shaft one 113 and the shaft two 114 are parallel to the axis of the plastic layer 11 and are integrally provided with the plastic layer 11. The permanent magnet 13 is sleeved in the coating layer 111. On the outer side of the rotor core 12, there are axially - through - provided shaft hole one 121 and shaft hole two 122. The shaft hole one 121 and the shaft hole two 122 are respectively matched with the shaft one 113 and the shaft two 114. The rotor core 12 is also fixedly matched with the plastic layer 11.

[0025] As Figure 6The plan view of the rotor core 12 shown, the rotor core 12 is triangular, with a first clamping block 123 integrally formed on its inner edge and a second clamping block 124 integrally formed on its outer edge. Both sides of the rotor core 12 are bevel edges 125. The permanent magnet 13 is clamped between the bevel edges 125 on both sides, and the inner and outer sides of the permanent magnet 13 are respectively clamped by the first clamping block 123 and the second clamping block 124. There is a coating layer 111 spaced between the permanent magnet 13 and the rotor core 12. By controlling the cooperation of multiple permanent magnets 13 and the rotor core 12, a circular shape is achieved. And through the clamping action of the first clamping block 123 and the second clamping block 124 on the permanent magnet 13, the permanent magnet 13 is tightly surrounded by the rotor core 12. Moreover, the rotor core 12 itself has high mechanical strength and stiffness and will not displace or fall off under centrifugal force. In addition, the first clamping block 123 and the second clamping block 124 clamp the permanent magnet 13, and there is a coating layer 111 spaced between the permanent magnet 13 and the rotor core 12, making the permanent magnet 13, the rotor core 12 and the coating layer 111 fit tightly together, reducing unnecessary vibration and noise.

[0026] As Figure 5 shown, an outer edge layer 112 is integrally formed on the outer side of the coating layer 111. The second clamping blocks 124 on both sides extend into the outer edge layer 112 from both sides respectively to achieve the buckling function, ensuring a tightly fitting state among the permanent magnet 13, the rotor core 12 and the coating layer 111, and at the same time avoiding damage to the permanent magnet 13 by the rotor core 12.

[0027] As Figure 4 shown, several inner edge layers 115 distributed circumferentially are integrally formed on the inner side of the plastic layer 11. On the outer side of the inner rotor core 15, there are core concave edges 151 with the same number as the inner edge layers 115 integrally formed. The inner edge layers 115 extend into the core concave edges 151, and there is a gap between them. A high-temperature resistant rubber layer 14 for fixation is embedded in the gap. It should be noted that the inner edge layers 115 and the core concave edges 151 are in a buckling state and have a gap. The rubber layer 14 in the gap is used to fix the inner edge layers 115 and the core concave edges 151, and the rubber layer 14 is a rubber material that can work stably in a high-temperature environment close to or reaching 80 °C, which can effectively absorb and disperse the vibration generated during the operation of the motor, thereby protecting the rotating shaft 2 from damage.

[0028] The plastic layer 11 is polybutylene terephthalate, which is used to isolate the permanent magnet 13 and the rotor core 12. It has excellent physical, mechanical, thermal and electrical properties and is widely used in the manufacture of motor rotors. It can not only meet the requirements of the motor rotor for material strength, heat resistance, electrical insulation, etc., but also has good processing formability, making the manufacture of the motor rotor more efficient and precise.

[0029] Working principle of the present utility model: The main feature of the built-in rotor structure 1 is that the permanent magnet 13 is embedded inside the rotor core 12, rather than directly attached to the surface of the core like a surface-mounted rotor. This structure wraps the permanent magnet 13 inside through the pole shoes of ferromagnetic materials, providing additional protection and optimizing the electromagnetic performance of the motor.

[0030] During the use of the rotor assembly, the plastic layer 11 is polybutylene terephthalate, which has high heat resistance, can remain stable in the high-temperature environment during the operation of the motor, is easy to process and form, and can be made into various-shaped motor rotor parts through processes such as injection molding, ensuring the tight connection between the rotor core 12 and the permanent magnet 13 and the plastic layer 11. In addition, it has good electrical insulation performance, which can ensure the electrical safety of the motor rotor.

[0031] The permanent magnet 13 is limited by the first block 123 and the second block 124. Under the action of centrifugal force, the permanent magnet 13 is tightly surrounded by the rotor core 12, and the rotor core 12 itself has high mechanical strength and stiffness, preventing the permanent magnet 13 from shifting or falling off during rotation.

[0032] The rubber layer 14 fixed between the inner edge layer 115 and the core concave edge 151 is used to connect the inner edge layer 115 and the core concave edge 151. In addition, vibrations will be generated during the operation of the motor, and these forces may damage the rotating shaft 2. The rubber material can effectively absorb and disperse these vibrations, thereby protecting the rotating shaft 2 from damage. Especially in a high-temperature environment, the rubber layer 14 is made of a rubber material that can work stably at a higher temperature, ensuring the stable operation of the motor.

[0033] 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 also includes elements inherent to such process, method, article or device.

[0034] 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, those skilled in the art can still modify the technical solutions recorded 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 vibration-proof rotor assembly, comprising a rotor structure (1) and a rotating shaft (2) inserted therein, characterized in that: The rotor structure (1) includes multiple groups of rotor cores (12) distributed circumferentially, multiple groups of permanent magnets (13) distributed circumferentially, a plastic layer (11) for insulation, and a rotor inner core (15) for fixing the rotating shaft (2); Multiple groups of the rotor cores (12) and multiple groups of permanent magnets (13) are distributed at intervals. Multiple groups of the rotor cores (12) and multiple groups of permanent magnets (13) are embedded in the plastic layer (11), and the rotor inner core (15) is sleeved in the plastic layer (11).

2. The anti-vibration rotor assembly according to claim 1, wherein: Multiple groups of circumferentially distributed coating layers (111) are integrally formed inside the plastic layer (11). Between the spaced coating layers (111), there are an inner and outer distributed shaft one (113) and shaft two (114). The shaft one (113) and shaft two (114) are parallel to the axis of the plastic layer (11) and are integrally provided with the plastic layer (11). The permanent magnet (13) is sleeved in the coating layer (111). Through holes shaft hole one (121) and shaft hole two (122) are provided on the outer side of the rotor core (12). The shaft hole one (121) and shaft hole two (122) cooperate with the shaft one (113) and shaft two (114) respectively.

3. The anti-vibration rotor assembly according to claim 2, characterized in that: The rotor core (12) is triangular. A first engaging block (123) is integrally formed on the inner-facing edge, and a second engaging block (124) is integrally formed on the outer-facing edge. Both sides of the rotor core (12) are bevel edges (125). The permanent magnet (13) is clamped between the two bevel edges (125). The inner and outer sides of the permanent magnet (13) are respectively clamped by the first engaging block (123) and the second engaging block (124). There is a coating layer (111) spaced between the permanent magnet (13) and the rotor core (12).

4. The anti-vibration rotor assembly according to claim 3, characterized in that: An outer edge layer (112) is integrally formed on the outer side of the coating layer (111). The two second engaging blocks (124) extend into the outer edge layer (112) from both sides respectively.

5. The anti-vibration rotor assembly according to claim 1, characterized in that: A number of circumferentially distributed inner edge layers (115) are integrally formed on the inner side of the plastic layer (11). A number of core recessed edges (151) equal to the number of the inner edge layers (115) are integrally formed on the outer side of the rotor inner core (15). The inner edge layer (115) extends into the core recessed edge (151), and there is a gap between them. A high-temperature resistant rubber layer (14) for fixing is embedded in the gap.

6. The anti-vibration rotor assembly according to claim 5, characterized in that: The plastic layer (11) is polybutylene terephthalate, which is used to isolate the permanent magnet (13) and the rotor core (12).

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