Power steering motor injection molded rotor

Abstract

This utility model discloses an injection-molded rotor for a power steering motor, comprising a rotor core and an injection-molded housing. The rotor core has a slot at its corner. The injection-molded housing includes a ring seat and a support column. A spacer is provided on the inner side of each support column, and a strip is provided on the spacer. A mounting groove for magnet insertion is formed between adjacent supports. Through the interlocking of the slot and the strip, the rotor core and the injection-molded housing are tightly connected, preventing delamination or displacement due to centrifugal force during high-speed rotation, thus improving structural stability. The mounting groove formed by adjacent supports allows magnets to be quickly inserted through an interference fit, achieving a "plug-and-fix" effect without the need for adhesives or pressure fitting. Furthermore, the softness of the injection-molded housing avoids the risk of magnet breakage due to the hardness of the silicon steel sheet. Additionally, the spacer physically isolates adjacent magnets, blocking direct magnetic flux coupling, reducing magnetic field interference and leakage loss, and enhancing motor performance.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a power steering motor injection rotor used in steering wheel motors. Background Technology

[0002] In power steering motor design, the rotor assembly is one of the core components, and its performance directly affects the motor's output efficiency and stability. Traditional rotor designs often use a circular iron core, along with traditional fixing methods such as press-fitting or gluing, to fix magnets to the rotor core. However, this design has several significant problems: First, the fixing method is not secure enough, and magnets are prone to loosening or falling off under long-term operation, affecting the reliability and service life of the motor; if the magnets are directly press-fitted onto the rotor core, the hard silicon steel sheets of the rotor core can easily cause the magnets to break; second, there is significant magnetic field interference between the magnets. Due to the lack of an isolation structure, the magnetic fields between adjacent magnets can easily interfere with each other, leading to magnetic field leakage and reducing the motor's efficiency and performance. Utility Model Content

[0003] To address the aforementioned shortcomings, the purpose of this utility model is to provide a power steering motor injection rotor with a reasonable structural design, easy assembly, reduced magnetic field leakage, and improved motor efficiency.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] A power steering motor injection-molded rotor includes a rotor core and an injection-molded housing. The rotor core is polygonal, with slots at its corners. The injection-molded housing includes a ring seat and a number of support pillars corresponding to the number of corners of the rotor core. Several support pillars are vertically connected to the ring seat corresponding to the corner positions. A spacer is provided on the inner side of each support pillar, and the spacer has inserts adapted to the slots. The fit between the inserts and the slots achieves a tight fit between the rotor core and the injection-molded housing. A mounting slot for inserting a magnet is formed between two adjacent support pillars, facilitating quick and easy installation of the magnet. Magnets in two adjacent mounting slots are separated by the spacer, effectively isolating the magnetic field between adjacent magnets, reducing magnetic field leakage, and improving motor efficiency.

[0006] In a preferred embodiment of this invention, the support column is symmetrically provided with groove wall strips on both sides, and the side of the groove wall strip connecting to the support column gradually thickens. This enhances the structural strength of the injection-molded base, making the magnet more stable in the mounting groove, less prone to loosening or falling off, and further improving the reliability of the motor.

[0007] In a preferred embodiment of this invention, the upper end of the groove wall strip is provided with an inclined surface. This facilitates the insertion and positioning of the magnet, reduces friction and resistance during installation, and improves production efficiency. Simultaneously, the inclined surface also serves as a guide, ensuring the magnet is correctly installed into the mounting groove.

[0008] In a preferred embodiment of this invention, the top surface of the support column is provided with positioning protrusions. These positioning protrusions can be used for precise positioning with the rotor core or other components, ensuring the accuracy and consistency of the rotor assembly during assembly, which helps improve the overall performance and stability of the motor.

[0009] As a preferred embodiment of this utility model, the rotor core is provided with a shaft hole at its center for cooperating with the motor shaft to realize the rotation function of the rotor assembly.

[0010] In a preferred embodiment of this invention, a plurality of through holes are provided symmetrically around the periphery of the shaft hole on the rotor core. These holes reduce the weight of the rotor core, decrease the moment of inertia of the motor, and improve the motor's response speed and dynamic performance. Simultaneously, the through holes also serve for heat dissipation, helping to lower the motor's temperature during operation.

[0011] In a preferred embodiment of this invention, the number of through holes corresponds to the number of corners of the rotor core, and they are located on the inner side between adjacent corners. This makes the rotor core structure more uniform and symmetrical, which helps to improve the balance and stability of the motor.

[0012] In a preferred embodiment of this invention, the rotor core is a regular octagon. It has more corners and edges, providing more slots and support connection points, thus enhancing the structural strength and stability of the rotor assembly.

[0013] The beneficial effects of this utility model are as follows: The structure is rationally designed. Through the interlocking of the slots and strips, the rotor core and the injection-molded base are tightly connected, preventing delamination or displacement due to centrifugal force during high-speed rotation and improving structural stability. Adjacent supports form mounting slots, allowing magnets to be quickly inserted into the slots via interference fit, achieving a "plug-and-fix" effect without the need for adhesives or pressure fitting. Furthermore, the softness of the injection-molded base avoids the risk of magnet breakage due to the hardness of the silicon steel sheet. Additionally, the spacers physically isolate adjacent magnets, blocking direct magnetic flux coupling, reducing magnetic field interference and leakage loss, and enhancing motor performance.

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is an exploded structural diagram of the present invention.

[0017] Figure 3 This is a partially enlarged structural schematic diagram of the injection molding base in this utility model. Detailed Implementation

[0018] See the example. Figure 1 , Figure 2 and Figure 3 This embodiment provides an injection-molded rotor for a power steering motor, which includes a rotor core 1 and an injection-molded housing 2.

[0019] The rotor core 1 is polygonal; in this embodiment, it is preferably a regular octagon. Having more corners and edges provides more slots and support connection points, enhancing the structural strength and stability of the rotor assembly. In other embodiments, the rotor core 1 can also be hexagonal, decagonal, etc.

[0020] A groove 11 is provided at the corner of the rotor core 1, and the groove 11 is in the shape of a dovetail groove.

[0021] The injection molding base 2 includes an annular seat 21 and eight support columns 22, the number of which corresponds to the number of corner sections of the rotor core 1. These eight support columns 22 are vertically connected to the annular seat 21 at the corresponding corner positions. The support columns 22 and the annular seat 21 are integrally injection molded. A spacer 221 is formed on the inner side of each support column 22. The spacer 221 has inserts 222 that fit into the groove 11. The fit between the inserts 222 and the groove 11 ensures a tight fit between the rotor core 1 and the injection molding base 2.

[0022] A mounting groove 23 for inserting magnets is formed between two adjacent support columns 22, facilitating quick and easy installation. Magnets within adjacent mounting grooves 23 are separated by spacers 221, effectively isolating the magnetic field between adjacent magnets, reducing magnetic field interference and leakage loss, and improving motor efficiency. Preferably, groove wall strips 223 are symmetrically provided on both sides of the support column 22, with the side of the groove wall strip 223 connecting to the support column 22 gradually thickening. This enhances the structural strength of the injection-molded base 2, making the magnet more stable in the mounting groove 23, less prone to loosening or falling off, and further improving motor reliability. An inclined surface is provided at the upper end of the groove wall strip 223. This facilitates magnet insertion and positioning, reduces friction and resistance during installation, and improves production efficiency. Simultaneously, the inclined surface also provides a guiding effect, ensuring the magnet is correctly installed in the mounting groove 23.

[0023] A positioning protrusion 224 is provided on the top surface of the support column 22. The positioning protrusion 224 can be used for precise positioning with the rotor core 1 or other components to ensure the accuracy and consistency of the rotor assembly during the assembly process, which helps to improve the overall performance and stability of the motor.

[0024] A shaft hole 12 is provided at the center of the rotor core 1 for engaging with the motor shaft to enable the rotation of the rotor assembly. Preferably, a plurality of through holes 13 are provided symmetrically around the periphery of the shaft hole 12 on the rotor core 1. The number of through holes 13 corresponds to the number of corners of the rotor core 1, and they are located on the inner side between adjacent corners. The through holes 13 are used to reduce the weight of the rotor core 1, reduce the moment of inertia of the motor, and improve the response speed and dynamic performance of the motor. At the same time, the through holes 13 can also be used for heat dissipation, helping to reduce the temperature of the motor during operation.

[0025] During production, several silicon steel sheets are stacked to form a rotor core 1, which is then placed in a mold. The injection molding process then forms the injection molded base 2. Since adjacent support columns 22 form mounting grooves 23, magnets can be quickly inserted into these grooves via an interference fit, achieving a "plug-and-fix" effect without the need for adhesives or pressure fitting. Furthermore, the softness of the injection molded base 2 avoids the risk of magnet breakage due to the hardness of the silicon steel sheets, thus improving the product qualification rate.

[0026] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. As described in the above embodiments of this utility model, other rotors obtained using the same or similar structures are all within the protection scope of this utility model.

Claims

1. A power steering motor injection-molded rotor, comprising a rotor core, characterized in that, It also includes an injection molding base. The rotor core is polygonal, and the corners of the rotor core are provided with slots. The injection molding base includes a ring seat and a number of pillars corresponding to the number of corners of the rotor core. Several pillars are vertically connected to the ring seat corresponding to the corner positions. A spacer is provided on the inner side of the pillar. The spacer is provided with a strip that matches the slot. An installation slot for inserting a magnet is formed between two adjacent pillars. The magnets in two adjacent installation slots are separated by the spacer.

2. The power steering motor injection-molded rotor according to claim 1, characterized in that: The support column has symmetrical grooved wall strips on both sides, and the side of the grooved wall strip that connects to the support column gradually thickens.

3. The power steering motor injection-molded rotor according to claim 2, characterized in that: The upper end of the groove wall strip is provided with an inclined surface.

4. The power steering motor injection-molded rotor according to claim 1, characterized in that: The top surface of the support column is provided with positioning protrusions.

5. The power steering motor injection-molded rotor according to claim 1, characterized in that: The rotor core has a shaft hole at its center.

6. The power steering motor injection-molded rotor according to claim 5, characterized in that: A number of through holes are provided symmetrically around the periphery of the shaft hole on the rotor core.

7. The power steering motor injection-molded rotor according to claim 6, characterized in that: The number of through holes is consistent with the number of corners of the rotor core, and they are located on the inner side between two adjacent corners.

8. The power steering motor injection-molded rotor according to any one of claims 1-7, characterized in that: The rotor core is a regular octagon.

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