A cast aluminum rotor aluminum end ring protection device

Abstract

The utility model discloses a cast aluminium rotor aluminium end ring protection device, including non -magnetic thin wall ring body, two position interlaced 90's anchor hole group is set up on non -magnetic thin wall ring body along its circumferential direction, wherein one anchor hole group includes: anchor hole one and anchor hole two, anchor hole one with anchor hole two symmetrical setting in the upper half of non -magnetic thin wall ring body's position, another anchor hole group includes: anchor hole three and anchor hole four, anchor hole three with anchor hole four symmetrical setting in the lower half of non -magnetic thin wall ring body's position, the utility model discloses thin wall ring body made of non -magnetic material such as stainless steel, both have good mechanical properties, and will not interfere with motor main magnetic field, avoided eddy current loss and electromagnetic distortion, and the high efficiency of motor and operating stability are guaranteed, and through setting two groups of anchor hole group on non -magnetic thin wall ring body, the mechanical interlocking structure of multiple point distribution, stress equilibrium is formed after solidification.

Description

Technical Field

[0001] This utility model belongs to the technical field of motor components, and in particular relates to a protective device for the aluminum end ring of a cast aluminum rotor. Background Technology

[0002] In high-speed motor applications, the aluminum end rings of traditional cast aluminum rotors are prone to deformation or even breakage under extreme operating conditions (such as speeds reaching 20,000 rpm or higher) due to the enormous centrifugal force and the softening of the material caused by the high temperatures generated during operation.

[0003] To address this issue, existing technologies have proposed reinforcing aluminum end rings with metal collars. However, using magnetically conductive materials as reinforcement introduces unnecessary magnetic field interference into the motor, affecting motor efficiency and stability. Furthermore, while selecting non-magnetically conductive materials can avoid the aforementioned electromagnetic interference problems, they often face insufficient bonding strength with the aluminum end ring, making it difficult to provide long-term reliable mechanical support. Utility Model Content

[0004] This utility model addresses the problems in the prior art by proposing the following technical solution: This utility model provides a protective device for the aluminum end ring of a cast aluminum rotor, comprising: A non-magnetic thin-walled ring body has two sets of anchor holes staggered by 90° along its circumference. One set of anchor holes includes anchor hole one and anchor hole two, which are symmetrically arranged in the upper half of the non-magnetic thin-walled ring body. The other set of anchor holes includes anchor hole three and anchor hole four, which are symmetrically arranged in the lower half of the non-magnetic thin-walled ring body. The non-magnetic thin-walled ring is pre-fixed to the bottom mold and precisely aligned with the rotor end ring. The non-magnetic thin-walled ring is metallurgically bonded to the rotor aluminum end ring by pouring molten aluminum and is wrapped around the outer surface of the aluminum end ring. Molten aluminum fills each anchoring hole to form a mechanical anchoring structure.

[0005] As a preferred embodiment of the above technical solution, the outer wall surface of the non-magnetic thin-walled ring is configured as a conical structure.

[0006] As a preferred embodiment of the above technical solution, the thickness of the non-magnetic thin-walled ring is 3-4 mm, and its diameter matches the aluminum end ring of the cast aluminum rotor.

[0007] As a preferred embodiment of the above technical solution, anchor hole one, anchor hole two, anchor hole three and anchor hole four are all round holes.

[0008] As a preferred embodiment of the above technical solution, the diameters of anchor hole one, anchor hole two, anchor hole three and anchor hole four are all 1 to 1.2 times the wall thickness of the non-magnetic thin-walled ring.

[0009] As a preferred embodiment of the above technical solution, the edges of anchor holes one, two, three and four are all ≥3mm away from the end of the non-magnetic thin-walled ring.

[0010] As a preferred embodiment of the above technical solution, the material of the non-magnetic thin-walled ring is 304 stainless steel.

[0011] The beneficial effects of this utility model are as follows: This invention utilizes a thin-walled ring made of non-magnetic materials such as stainless steel. This ring possesses excellent mechanical properties without interfering with the motor's main magnetic field, avoiding eddy current losses and electromagnetic distortion, thus ensuring high motor efficiency and operational stability. Furthermore, by setting two sets of symmetrical anchoring holes with 90° circumferential spacing on the non-magnetic thin-walled ring, the molten aluminum fully fills anchoring holes one through four during casting. After solidification, this forms a multi-point distributed, balanced mechanical interlocking structure, significantly improving the interfacial bonding strength between the non-magnetic thin-walled ring and the cast aluminum end ring. This composite connection method of "mechanical anchoring + metallurgical bonding" effectively solves the technical problem of insufficient bonding strength between traditional non-magnetic materials and aluminum end rings, maintaining structural integrity even under high-speed operation and preventing ring detachment or interfacial cracking.

[0012] Meanwhile, the non-magnetic thin-walled ring is wrapped around the outer surface of the aluminum end ring as a high-strength support layer, which can significantly suppress the radial expansion and plastic deformation of the end ring caused by high-speed centrifugal force, and improve the structural stiffness and operational reliability of the rotor.

[0013] (2) This utility model sets a conical surface structure on the outer wall of the non-magnetic thin-walled ring. The conical surface can be used as a positioning guide structure. During the mold assembly process, it can cooperate with the bottom mold end ring groove to achieve automatic centering, ensure the accurate alignment of the protective ring and the rotor cavity, and improve the assembly accuracy. In addition, during the demolding stage after casting, the conical surface structure can effectively reduce the frictional resistance between the non-magnetic thin-walled ring and the mold, avoid jamming or tearing, and significantly improve the demolding smoothness and mold service life. Attached Figure Description

[0014] Figure 1 The diagram shown is an overall schematic of the protective device in the embodiment; Figure 2 The diagram shown is a top view of the protective device in the embodiment; Figure 3 What is shown is Figure 2 A schematic diagram of the AA cross-sectional structure in the diagram; Figure 4 What is shown is Figure 3 Enlarged schematic diagram of the structure at point B in the diagram; Figure reference numerals: 10, non-magnetic thin-walled ring; 11, anchor hole one; 12, anchor hole two; 13, anchor hole three; 14, anchor hole four; 15, outer wall surface. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0016] Example like Figure 1 As shown, Figure 1 The diagram shown is an overall schematic of the protective device in the embodiment; This device includes: A non-magnetic thin-walled ring 10 has two sets of anchor holes that are staggered by 90° along its circumference. One set of anchor holes includes anchor hole 11 and anchor hole 2 12, which are symmetrically arranged in the upper half of the non-magnetic thin-walled ring 10. The other set of anchor holes includes anchor hole 3 13 and anchor hole 4 14, which are symmetrically arranged in the lower half of the non-magnetic thin-walled ring 10.

[0017] The non-magnetic thin-walled ring 10 is pre-fixed to the bottom mold and precisely aligned with the rotor end ring. The non-magnetic thin-walled ring 10 forms a metallurgical bond with the rotor aluminum end ring by pouring molten aluminum, wrapping around the outer surface of the aluminum end ring. The molten aluminum fills each anchoring hole to form a mechanical anchoring structure, which improves the bonding strength between the non-magnetic thin-walled ring 10 and the aluminum end ring, and achieves high interface strength and resistance to centrifugal deformation.

[0018] Specifically, the non-magnetic thin-walled ring 10 is made of 304 stainless steel, which can avoid magnetic field interference and ensure stable motor efficiency. The thickness of the non-magnetic thin-walled ring 10 is 3-4mm, and its diameter matches the aluminum end ring of the cast aluminum rotor, making it lightweight while meeting strength requirements and reducing rotational inertia.

[0019] Anchor holes 11, 12, 13, and 14 are all circular holes with a diameter of 1 to 1.2 times the wall thickness of the non-magnetic thin-walled ring 10. During casting, the molten aluminum fills the holes to form a mechanical anchor, enhancing the bonding strength. The distance between the edge of each anchor hole and the end of the non-magnetic thin-walled ring 10 is ≥3mm, ensuring the anchoring effect of the molten aluminum and the strength of the non-magnetic thin-walled ring 10.

[0020] The anchoring holes form a uniform force distribution, which improves the symmetry and torsional resistance of the overall connection. The symmetrical arrangement of the upper and lower halves is beneficial for mold positioning and casting balance, and reduces the risk of eccentricity.

[0021] like Figure 2 , Figure 3 , Figure 4 As shown, Figure 2 The diagram shown is a top view of the protective device in the embodiment; Figure 3 What is shown is Figure 2 A schematic diagram of the AA cross-sectional structure in the diagram; Figure 4 What is shown is Figure 3 Enlarged schematic diagram of the structure at point B in the diagram; The outer wall surface 15 of the non-magnetic thin-walled ring 10 is set as a conical structure.

[0022] The outer wall surface is designed with a 15° taper of 2° for positioning guidance and demolding assistance, improving assembly accuracy and efficiency.

[0023] Figure 4 The thickness represented by the middle letter "h" is less than the thickness represented by the other letter "H".

[0024] During the processing of this device: a non-magnetic thin-walled ring 10 (thickness range between 3-4mm) made of 304 stainless steel is processed according to the size of the rotor aluminum end ring. The outer wall surface 15 is processed with a 2° conical surface. Then, a group of circular anchoring holes with a diameter of 1 to 1.2 times the wall thickness is opened, and the edge of each hole is ≥3mm away from the end of the non-magnetic thin-walled ring 10. After opening the holes, the surface is sandblasted.

[0025] Mold assembly process: The non-magnetic thin-walled ring 10 is positioned and fixed in the end ring groove of the bottom mold of the casting mold through its conical outer wall surface 15, ensuring alignment with the rotor cavity.

[0026] Casting and demolding process: Pour in molten aluminum, which fills the inner side of the non-magnetic thin-walled ring 10 and each anchoring hole. After cooling, it forms an interlocking structure and is guided by the conical outer wall surface 15 to demold, reducing demolding resistance.

[0027] Post-processing: Remove burrs, inspect the non-magnetic thin-walled ring 10 for gaps between the mating surfaces of the non-magnetic thin-walled ring 10 and the aluminum end ring, and complete rotor assembly.

[0028] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A protective device for the aluminum end ring of a cast aluminum rotor, characterized in that, include: A non-magnetic thin-walled ring (10) has two sets of anchor holes that are staggered by 90° along its circumference. One set of anchor holes includes anchor hole one (11) and anchor hole two (12), which are symmetrically arranged in the upper half of the non-magnetic thin-walled ring (10). The other set of anchor holes includes anchor hole three (13) and anchor hole four (14), which are symmetrically arranged in the lower half of the non-magnetic thin-walled ring (10). The non-magnetic thin-walled ring (10) is pre-fixed to the bottom mold and precisely aligned with the rotor end ring. The non-magnetic thin-walled ring (10) forms a metallurgical bond with the rotor aluminum end ring by pouring molten aluminum and wraps around the outer surface of the aluminum end ring. Molten aluminum fills each anchoring hole to form a mechanical anchoring structure.

2. The aluminum end ring protection device for a cast aluminum rotor according to claim 1, characterized in that, The outer wall surface (15) of the non-magnetic thin-walled ring (10) is set as a conical structure.

3. The aluminum end ring protection device for a cast aluminum rotor according to claim 1, characterized in that, The thickness of the non-magnetic thin-walled ring (10) is 3-4 mm, and its diameter matches the aluminum end ring of the cast aluminum rotor.

4. The aluminum end ring protection device for a cast aluminum rotor according to claim 1, characterized in that, Anchor hole one (11), anchor hole two (12), anchor hole three (13) and anchor hole four (14) are all round holes.

5. The aluminum end ring protection device for a cast aluminum rotor according to claim 1, characterized in that, The diameters of the first anchor hole (11), the second anchor hole (12), the third anchor hole (13), and the fourth anchor hole (14) are all 1 to 1.2 times the wall thickness of the non-magnetic thin-walled ring (10).

6. The aluminum end ring protection device for a cast aluminum rotor according to claim 1, characterized in that, The distance from the edge of each of the anchor holes 1 (11), 2 (12), 3 (13) and 4 (14) to the end of the non-magnetic thin-walled ring (10) is ≥3mm.

7. The aluminum end ring protection device for a cast aluminum rotor according to claim 1, characterized in that, The non-magnetic thin-walled ring (10) is made of 304 stainless steel.

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