Permanent magnet rotor with a limiting structure

Abstract

The utility model relates to permanent magnet motor technical field, concretely is a kind of permanent magnet rotor with limiting structure, including rotor core, rotor core is made of multiple punching sheet laminated, be equipped with several magnet steel grooves for accommodating magnet steel on rotor core, be equipped with several limiting structures on the punching sheet of the end part of rotor core, limiting structure includes the protrusion extending towards magnet steel groove bottom, the top surface of protrusion and the projection of magnet steel groove on horizontal plane at least partially overlap, the top surface of protrusion and the bottom surface of magnet steel groove are coplanar, several limiting structures and several magnet steel grooves one-to-one correspondence, the utility model effectively solves the problem that traditional permanent magnet rotor is prone to string movement in magnet steel assembly process, and assembly is not in place, significantly improve magnet steel positioning accuracy and assembly consistency, this limiting structure is directly stamped into shape on punching sheet, need not additional parts or complex technology, simple structure, low in manufacturing cost, suitable for large-scale production, with good practicality and economy.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, specifically a permanent magnet rotor with a limit structure. Background Technology

[0002] Permanent magnet motors, due to their high efficiency and high power, are widely used in industrial drives, new energy vehicles, and home appliances. One of the core components of a permanent magnet rotor is the magnet, and its assembly quality directly affects the motor's performance and lifespan. Traditional permanent magnet rotors typically fix the magnets by creating slots in the rotor core. However, because these slots lack effective limiting structures, the magnets are prone to shifting or misalignment during assembly, leading to inconsistent magnet positions. This assembly uncertainty not only affects the rotor's dynamic balance but can also reduce the motor's efficiency and reliability, and in severe cases, even cause magnet detachment and motor failure. Currently, while some structures attempt to fix the magnets using adhesives or additional clips, these methods are often complex, costly, and unsuitable for large-scale production. Therefore, there is an urgent need for a permanent magnet rotor structure that can effectively limit magnet displacement and improve assembly consistency. Utility Model Content

[0003] The technical problem this invention aims to solve is to address the issue of cross-movement and inconsistent positioning that easily occur during the assembly of magnets in traditional permanent magnet rotors. The invention provides a permanent magnet rotor with a limiting structure, which is set on the end lamination of the rotor and achieves precise positioning of the magnets by cooperating with the magnet slots. The structure is simple, the limiting is reliable, and it is easy to manufacture.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a permanent magnet rotor with limiting structures, comprising a rotor core, wherein the rotor core is formed by stacking multiple laminations, the rotor core is provided with a plurality of magnetic slots for accommodating magnets, and the laminations located at the ends of the rotor core are provided with a plurality of limiting structures, the limiting structures including protrusions extending toward the bottom of the magnetic slots, the top surface of the protrusions at least partially overlapping the projection of the magnetic slots on the horizontal plane, the top surface of the protrusions being coplanar with the bottom surface of the magnetic slots, and the plurality of limiting structures corresponding one-to-one with the plurality of magnetic slots.

[0005] Preferably, the limiting structure is disposed on the side wall of the magnetic steel groove and protrudes into the groove.

[0006] Preferably, the limiting structure is integrally formed with the stamping piece by a stamping process.

[0007] Preferably, the protrusion is cuboid in shape, and the length of the protrusion extending along the width direction of the magnet groove is 1 / 5 to 1 / 3 of the width of the magnet.

[0008] Preferably, the protrusion has a length of 5-6 mm, a width of 0.5-0.8 mm, and a height of 0.2-0.5 mm.

[0009] Compared with existing technologies, this utility model provides a permanent magnet rotor with a limiting structure, which has the following advantages: This utility model provides a limiting structure on the laminations at the ends of the rotor core, corresponding one-to-one with the magnet slots. This limiting structure includes a protrusion extending towards the bottom of the magnet slot. The top surface of the protrusion at least partially overlaps with the projection of the magnet slot onto the horizontal plane, and the top surface of the protrusion is coplanar with the bottom surface of the magnet slot, thus effectively limiting the magnets during assembly. This structure not only prevents the magnets from moving up and down within the slots, ensuring the consistency of all magnet assembly positions, but also improves assembly efficiency and product quality. The limiting structure is integrally formed with the laminations through a stamping process, requiring no additional parts or complex processes, resulting in a simple manufacturing process, low cost, and suitability for mass production. The shape and size of the protrusion are optimized to ensure the limiting effect without interfering with magnet installation, further improving assembly accuracy and product consistency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a traditional rotor core; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a schematic diagram of the limiting structure of this utility model; Figure 4 This is a schematic diagram of the protruding structure of this utility model; Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0011] Explanation of reference numerals in the attached diagram: 1. Rotor core; 2. Lamination; 3. Magnet; 4. Magnet slot; 5. Limiting structure; 51. Protrusion; 6. Central shaft; 7. Traditional rotor core. Detailed Implementation

[0012] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model: like Figure 1 As shown, traditional permanent magnet rotors typically fix the magnets 3 by creating magnet slots 4 on the traditional rotor core 7. However, due to the lack of an effective limiting structure in the magnet slots 4, the magnets 3 are prone to misalignment or improper installation during assembly, leading to inconsistent positions of the magnets 3 within the slots. This affects the rotor's dynamic balance and the motor's operational reliability. Deviations in the position of the magnets 3 can also cause uneven magnetic field distribution, reducing motor efficiency and even causing the magnets 3 to detach, resulting in equipment failure.

[0013] To solve the above technical problems, such as Figure 2-5 As shown, this utility model provides a permanent magnet rotor with a limiting structure, including a rotor core 1, which is formed by stacking multiple laminations 2. The rotor core 1 is provided with a plurality of magnet slots 4 for accommodating magnets 3, and the laminations 2 located at the ends of the rotor core 1 are provided with a plurality of limiting structures 5.

[0014] The limiting structure 5 is integrally formed with the lamination 2 through a stamping process, resulting in a robust structure and simple manufacturing process. It requires no additional parts or assembly steps, thus reducing production costs and improving efficiency. The limiting structure 5 is located on the side wall of the magnet slot 4 and protrudes into the slot, effectively restricting the radial movement of the magnet 3 and preventing it from shifting or falling off due to centrifugal force during high-speed rotor operation. The limiting structure 5 includes a protrusion 51 extending towards the bottom of the magnet slot 4. The top surface of the protrusion 51 at least partially overlaps with the projection of the magnet slot 4 onto the horizontal plane, and the top surface of the protrusion 51 is coplanar with the bottom surface of the magnet slot 4. Several limiting structures 5 correspond one-to-one with several magnet slots 4. This design ensures that when the magnet 3 is inserted into the magnet slot 4, its end is blocked by the protrusion 51, preventing the magnet 3 from shifting within the slot and ensuring that all magnets 3 are assembled in the same position. The protrusion 51 is cuboid in shape, with dimensions of 5-6 mm in length, 0.5-0.8 mm in width, and 0.2-0.5 mm in height. This design ensures the limiting function while minimizing interference with the installation of the magnet. The extension length of the protrusion 51 along the width direction of the magnet groove 4 is 1 / 5 to 1 / 3 of the width of the magnet 3. This range provides sufficient contact area to maintain the reliability of the limiting function while avoiding difficulties in magnet assembly due to excessive size.

[0015] When assembling the magnets 3, multiple laminations 2 are first stacked to form the rotor core 1. The laminations 2 at the ends are pre-formed into a limiting structure 5 using a stamping process. After all the laminations 2 are aligned and stacked, they are pressed and fixed through the shaft hole of the central shaft 6 to form a complete rotor structure. Subsequently, the magnets 3 are pushed into the slots along the axial direction of the magnet slots 4. When the magnets 3 are assembled to near their final position, the ends of the magnets 3 will contact the protrusions 51 of the limiting structure 5. Since the top surface of the protrusions 51 and the projection of the magnet slots 4 on the horizontal plane at least partially overlap, and the top surface of the protrusions 51 and the bottom surface of the magnet slots 4 are coplanar, a physical barrier is formed at the end of the magnet slots 4, achieving precise positioning of the magnets 3, preventing them from moving forward further, and ensuring that all magnets 3 are assembled in the same position.

[0016] Furthermore, the limiting structure 5 is integrally stamped with the lamination 2, eliminating the need for additional parts, simplifying the production process, and reducing production costs. This makes it particularly suitable for automated production lines and large-scale manufacturing. After assembly, when the magnet 3 is subjected to centrifugal and electromagnetic forces during rotor operation, the limiting structure 5 can still provide reliable holding force to prevent the magnet 3 from shifting or falling off, thereby improving the long-term operational stability and service life of the motor.

[0017] This invention features a simple structure, reliable positioning, and convenient manufacturing. It not only improves the assembly accuracy and consistency of the magnets but also enhances the stability and service life of the rotor during operation, making it particularly suitable for the large-scale production of permanent magnet motors.

[0018] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A permanent magnet rotor with a limiting structure, comprising a rotor core (1) which is laminated by a plurality of punched sheets (2), and a plurality of magnet slots (4) for accommodating magnet steels (3) are arranged on the rotor core (1), characterized in that: A plurality of limiting structures (5) are provided on the lamination (2) at the end of the rotor core (1). The limiting structure (5) includes a protrusion (51) extending toward the bottom of the magnet slot (4). The top surface of the protrusion (51) at least partially overlaps with the projection of the magnet slot (4) on the horizontal plane. The top surface of the protrusion (51) is coplanar with the bottom surface of the magnet slot (4). The plurality of limiting structures (5) correspond one-to-one with the plurality of magnet slots (4).

2. The permanent magnet rotor with a limiting structure according to claim 1, characterized in that: The limiting structure (5) is located on the side wall of the magnetic steel groove (4) and protrudes into the groove.

3. The permanent magnet rotor with a limiting structure of claim 1, wherein: The limiting structure (5) is integrally formed with the stamping piece (2) by a stamping process.

4. The permanent magnet rotor with a limiting structure of claim 1, wherein: The protrusion (51) is cuboid in shape, and the extension length of the protrusion (51) along the width direction of the magnet groove (4) is 1 / 5 to 1 / 3 of the width of the magnet (3).

5. The permanent magnet rotor with a limiting structure according to claim 1, characterized in that: The protrusion (51) has a length of 5-6 mm, a width of 0.5-0.8 mm, and a height of 0.2-0.5 mm.

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