Disc type motor rotor with self-positioning magnetic steel

Abstract

The utility model provides a kind of disc motor rotor of magnetic steel self-positioning, including rotor rotating shaft and multiple sectorial magnetic steels, the outer wall of rotor rotating shaft is circumferentially distributed with multiple radial insertion hole and the positioning rod inserted therein, the one end of positioning rod is fixedly inserted in corresponding radial insertion hole along radial direction, the both sides of each sectorial magnetic steel are respectively provided with the positioning slot extending radially, sectorial magnetic steel is respectively clamped on two adjacent positioning rods by the positioning slot of its both sides, two sectorial magnetic steels adjacent are clamped on the same positioning rod by the positioning slot of respective side edge jointly.The utility model can realize the axial and circumferential bidirectional self-positioning of magnetic steel, simplify rotor structure and improve assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of disc motor technology, and more specifically, to a disc motor rotor with self-positioning magnets. Background Technology

[0002] As an important branch of special motors, the rotor structure design of disc motors directly affects the power density and operational reliability of the motor. Existing disc motor rotor assemblies are usually composed of a shaft and circumferentially spaced magnets. However, there is a significant bottleneck in the positioning and fixing method of the magnets. The traditional solution requires the upper and lower housings to be coaxially fixed on the outer wall of the shaft. The two housings cooperate to form multiple circumferentially distributed magnet placement chambers. Each magnet needs to be individually embedded in the corresponding placement chamber to complete the installation. This double-housing nested structure not only greatly increases the number of rotor parts and the overall complexity, but also leads to a cumbersome assembly process: the installation process must strictly follow the procedure of fixing the upper and lower housings first, and then filling the magnets one by one. The operation steps are redundant and the error tolerance is low. Especially in mass production, the multi-stage assembly process significantly drags down production efficiency. At the same time, the housing structure adds axial dimensions and inertial load to the rotor, which is not conducive to the improvement of motor lightweighting and dynamic response performance. Utility Model Content

[0003] The purpose of this invention is to overcome the defects in the prior art and provide a disc motor rotor with self-positioning magnets. The rotor achieves bidirectional self-positioning of the magnets in both the axial and circumferential directions through the cooperation structure of the positioning rod and the positioning groove of the magnets, eliminating the traditional upper and lower shell structure, thereby simplifying the rotor assembly process and improving the structural compactness.

[0004] To solve the above problems, this utility model provides a disc motor rotor with self-positioning magnets, including a rotor shaft and multiple sector magnets. The outer wall of the rotor shaft has multiple radial insertion holes and positioning rods inserted therein. One end of the positioning rod is fixedly inserted into the corresponding radial insertion hole. Each sector magnet has radially extending positioning grooves on both sides. The sector magnets are respectively engaged with two adjacent positioning rods through the positioning grooves on both sides. Two adjacent sector magnets are engaged with the same positioning rod through the positioning grooves on their respective sides.

[0005] Compared with existing technologies, the advantages of this invention are as follows: By omitting the traditional upper and lower shell structures and utilizing the positioning rods fixedly inserted into the radial insertion holes of the rotor shaft, along with the radially extended positioning slots on both sides of the fan-shaped magnets, this invention achieves bidirectional self-positioning of the magnets in both axial and circumferential directions, thus significantly simplifying the rotor assembly process. The magnets can be directly engaged with adjacent positioning rods through their positioning slots, eliminating the need for a multi-stage process of first fixing the shell and then individually filling in the magnets. This reduces the number of parts and assembly steps, significantly improving assembly efficiency and production batch applicability, while also reducing operational error tolerance. Furthermore, omitting the shell structure effectively reduces the rotor's axial dimensions and inertial load, improving the motor's lightweight level and dynamic response performance. The tight engagement between the positioning rods and the magnet positioning slots ensures stable positioning of the magnets, enhancing the overall reliability and compactness of the rotor structure.

[0006] As an improvement, the positioning rod includes an integrally formed first rod body and a second rod body. The first rod body is a cylinder, and its axial inner end is interference-fitted into a radial insertion hole. The positioning groove is a V-shaped groove extending along the axial direction of the fan-shaped magnet. The second rod body is a square prism with a rectangular cross-section. The four circumferential sides of the second rod body respectively fit against the groove walls of the positioning grooves on the two adjacent fan-shaped magnets. The two opposite corners of the cross-section of the second rod body are located in the middle of the V-shaped grooves of the two adjacent positioning grooves. This improved design utilizes an integrated positioning rod design. The first rod is cylindrical and interference-fitted into a radial insertion hole, simplifying the rotor shaft machining process (round hole machining is easier than irregular hole machining) and reducing manufacturing costs. Simultaneously, the positioning groove employs a V-groove structure, which, combined with the square column design of the second rod, ensures that the four circumferential sides of the square column tightly fit against the V-groove walls of the adjacent sector magnets, forming surface contact rather than point contact. This enhances the fixing firmness, prevents the magnets from loosening or rotating during operation, and improves the torsional strength and reliability of the rotor structure. Furthermore, the V-groove design avoids the problem of thin walls forming at the groove edges when the sector magnets are thin, eliminating stress concentration and the risk of breakage, and improving the overall structural durability and assembly stability.

[0007] As an improvement, a carbon fiber ring is fixedly fitted onto the outer circumference of the sector-shaped magnet. This improvement utilizes the high strength and lightweight properties of carbon fiber to enhance the structural rigidity and deformation resistance of the magnet, preventing radial displacement or fracture of the magnet under high speed or impact loads, thereby improving the rotor's operational reliability and lifespan. Simultaneously, the lightweight nature of the carbon fiber ring further reduces the overall weight of the rotor, lowering inertial loads and helping to optimize the motor's dynamic response performance and energy efficiency. Furthermore, its tight fit with the magnet eliminates the need for additional complex connectors, maintaining the rotor's compactness. Attached Figure Description

[0008] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the positioning rod in this utility model.

[0009] Explanation of reference numerals in the attached figures: 1. Rotor shaft; 2. Sector magnet; 3. Radial insertion hole; 4. Positioning rod; 41. First rod body; 42. Second rod body; 5. Positioning groove; 6. Carbon fiber ring. Detailed Implementation

[0010] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0011] like Figure 1 and Figure 2 As shown, a disc motor rotor with self-positioning magnets includes a rotor shaft 1 and multiple sector magnets 2. The outer wall of the rotor shaft 1 has multiple radial insertion holes 3 and positioning rods 4 inserted therein. One end of the positioning rod 4 is fixedly inserted into the corresponding radial insertion hole 3. Each sector magnet 2 has radially extending positioning grooves 5 on both sides. The sector magnet 2 is respectively engaged with two adjacent positioning rods 4 through the positioning grooves 5 on both sides. Two adjacent sector magnets 2 are engaged with the same positioning rod 4 through the positioning grooves 5 on their respective sides.

[0012] This embodiment omits the traditional upper and lower shell structures and utilizes the positioning rods 4 fixedly inserted into the radial insertion holes 3 of the rotor shaft 1, along with the radially extending positioning slots 5 on both sides of the fan-shaped magnets 2, to achieve bidirectional self-positioning of the magnets in both axial and circumferential directions, thus significantly simplifying the rotor assembly process. The magnets can be directly engaged with adjacent positioning rods 4 through their positioning slots 5, eliminating the need for a multi-stage process of first fixing the shell and then individually filling in the magnets. This reduces the number of parts and assembly steps, significantly improving assembly efficiency and production batch applicability, while also reducing operational error tolerance. Furthermore, omitting the shell structure effectively reduces the rotor's axial dimensions and inertial load, improving the motor's lightweight level and dynamic response performance. The tight engagement between the positioning rods 4 and the magnet positioning slots 5 ensures stable positioning of the magnets, enhancing the overall reliability and compactness of the rotor structure.

[0013] like Figure 2 and Figure 3As shown, the positioning rod 4 includes an integrally formed first rod body 41 and a second rod body 42. The first rod body 41 is a cylinder, and the inner axial end of the first rod body 41 is inserted into the radial insertion hole 3 with an interference fit. The positioning groove 5 is a V-shaped groove extending along the axial direction of the fan-shaped magnet 2. The second rod body 42 is a square prism with a rectangular cross-section. The four circumferential sides of the second rod body 42 are respectively attached to the groove walls of the positioning groove 5 on the two adjacent fan-shaped magnets 2. The two opposite corners of the cross-section of the second rod body 42 are located in the middle of the V-shaped groove of the two adjacent positioning grooves 5. This improved design utilizes an integrated positioning rod 4. The first rod 41 is cylindrical and interference-fitted into the radial insertion hole 3, simplifying the machining process of the rotor shaft 1 (round hole machining is more convenient than irregular hole machining) and reducing manufacturing costs. Simultaneously, the positioning groove 5 adopts a V-groove structure, which, combined with the square column design of the second rod 42, ensures that the four circumferential sides of the square column are tightly fitted to the V-groove walls of the adjacent sector magnets 2, forming surface contact rather than point contact. This enhances the fixing firmness, prevents the magnets from loosening or rotating during operation, and improves the torsional strength and reliability of the rotor structure. Furthermore, the V-groove design avoids the problem of thin walls forming at the groove edge when the sector magnets 2 are thin, eliminating stress concentration and the risk of breakage, and improving the overall structural durability and assembly stability. To facilitate the insertion and fixation of the first rod 41 into the radial insertion hole 3, the first rod 41 is typically designed as a cone that tapers radially from the outside to the inside along the axial direction. Meanwhile, the four edges of the second rod 42 are provided with arc-shaped chamfers. The arc-shaped chamfers transform the sharp angles of the edges into smooth transition surfaces, so that when the fan-shaped magnet 2 slides in along the axial direction of the second rod 42, it is automatically guided to the designed position, avoiding rigid collision between the edges and the sharp corners of the V-groove, which would cause jamming and significantly reduce assembly resistance.

[0014] like Figure 1 As shown, a carbon fiber ring 6 is fixedly fitted onto the outer circumferential surface of the sector-shaped magnet 2. This improved design utilizes the high strength and lightweight properties of carbon fiber to enhance the structural rigidity and deformation resistance of the magnet, preventing radial displacement or breakage of the magnet under high speed or impact loads, thereby improving the rotor's operational reliability and lifespan. Simultaneously, the lightweight nature of the carbon fiber ring 6 further reduces the overall weight of the rotor, lowers inertial load, and helps optimize the motor's dynamic response performance and energy efficiency. Furthermore, its tight fit with the magnet eliminates the need for additional complex connecting parts, maintaining the rotor's compactness.

[0015] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. A disc type motor rotor with self-positioning magnetic steel, comprising a rotor shaft (1) and a plurality of sector-shaped magnetic steel sheets (2), characterized in that: The outer wall of the rotor shaft (1) is circumferentially distributed with multiple radial insertion holes (3) and positioning rods (4) inserted therein. One end of the positioning rod (4) is fixedly inserted into the corresponding radial insertion hole (3) along the radial direction. Each fan-shaped magnet (2) has radially extending positioning grooves (5) on both sides. The fan-shaped magnet (2) is respectively engaged with two adjacent positioning rods (4) through the positioning grooves (5) on both sides. Two adjacent fan-shaped magnets (2) are engaged with the same positioning rod (4) through the positioning grooves (5) on their respective sides.

2. The magnet steel self-locating disc-type motor rotor according to claim 1, characterized in that: The positioning rod (4) includes an integrally formed first rod body (41) and a second rod body (42). The first rod body (41) is a cylinder. The inner axial end of the first rod body (41) is inserted into the radial insertion hole (3) with an interference fit. The positioning groove (5) is a V-shaped groove extending along the axial direction of the fan-shaped magnet (2). The second rod body (42) is a square prism with a rectangular cross-section. The four circumferential sides of the second rod body (42) are respectively attached to the groove walls of the positioning grooves (5) on the two adjacent fan-shaped magnets (2). The two opposite corners of the cross-section of the second rod body (42) are located in the middle of the V-shaped grooves of the two adjacent positioning grooves (5).

3. The magnet steel self-locating disc motor rotor of claim 1, wherein: The outer circumferential surface of the sector magnet (2) is fixedly fitted with a carbon fiber ring (6).

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