Rotor punching sheet, motor rotor core, motor, vehicle and method for manufacturing motor rotor core

Abstract

The present disclosure relates to a rotor punching sheet, a motor rotor core, a motor, a vehicle and a method for manufacturing a motor rotor core, wherein the rotor punching sheet includes a plurality of punching sheet blocks, a magnetic steel slot for placing a permanent magnet is formed between two adjacent punching sheet blocks, and the two adjacent punching sheet blocks are connected by a first magnetic isolation bridge to isolate the adjacent magnetic steel slots, and the first magnetic isolation bridge is made of amorphous material. The first magnetic isolation bridge in the rotor punching sheet of the present disclosure is made of amorphous material, and the amorphous material has the characteristics of high tensile strength, low saturation magnetic density, low magnetic permeability, etc., so that the motor using the rotor punching sheet of the present disclosure can utilize the characteristics of high strength of the first magnetic isolation bridge to increase the maximum speed of the motor, and utilize the characteristics of low saturation magnetic density of the first magnetic isolation bridge to reduce the magnetic flux passing through the first magnetic isolation bridge, thereby improving the maximum torque and maximum efficiency of the motor.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and in particular, to a rotor core assembly, and a motor rotor structure and a motor using the rotor core assembly. Background Art

[0002] In order to prevent the permanent magnet's magnetic flux leakage coefficient from being too large and thus causing the permanent magnet's utilization rate to be too low, a magnetic flux isolation bridge needs to be set between two adjacent permanent magnets in the rotor to limit the magnetic flux leakage of the permanent magnet. In the related art, the magnetic flux isolation bridge is usually made of silicon steel sheets, which is easy to break due to insufficient strength when the motor runs at high speed, causing damage to the motor. Summary of the invention

[0003] The purpose of the present disclosure is to provide a rotor punching sheet, which can enable the motor to have a higher rotation speed and use efficiency.

[0004] In order to achieve the above object, the present disclosure provides a rotor punching sheet, comprising:

[0005] A plurality of punching sheet blocks are provided, and a magnetic steel slot for placing a permanent magnet is formed between two adjacent punching sheet blocks. The two adjacent punching sheet blocks are connected by a first magnetic isolation bridge to isolate the adjacent magnetic steel slots. The first magnetic isolation bridge is made of amorphous material.

[0006] Optionally, the punching sheet block includes a first punching sheet block and a second punching sheet block, and a plurality of the second punching sheet blocks are arranged at intervals along the outer periphery of the first punching sheet block. The second punching sheet blocks are fan-shaped, and two V-shaped magnetic steel grooves are formed between each of the second punching sheet blocks and the first punching sheet block. The first magnetic isolation bridge is located at one end where two adjacent magnetic steel grooves are close to each other.

[0007] Optionally, the punching sheet block also includes a third punching sheet block, which is located on the outer periphery of the second punching sheet block and is connected to the second punching sheet block through the first magnetic isolation bridge, and encloses at least two magnetic steel slots for placing the permanent magnets.

[0008] Optionally, the third punching sheet block is fan-shaped, located at the center of the second punching sheet block, and forms two V-shaped magnetic steel grooves between the third punching sheet block and the second punching sheet block.

[0009] Optionally, the punching sheet block is made of silicon steel material, and the amorphous material is one or more of an iron-based amorphous alloy, an iron-nickel-based amorphous alloy, a cobalt-based amorphous alloy or a nano-amorphous alloy.

[0010] Optionally, the rotor punching sheet further includes a second magnetic isolation bridge connected to the outer periphery of the plurality of punching sheet blocks adjacent to the magnetic steel slots for being connected to the punching sheet sleeve, and the second magnetic isolation bridge is made of amorphous material.

[0011] According to a second aspect of the present disclosure, a motor rotor core is provided, comprising a plurality of rotor punchings as described in the above-mentioned embodiments, wherein the plurality of rotor punchings are stacked axially, and further comprising a punching sleeve, wherein the punching sleeve is sleeved on the outer periphery of the rotor punching, and the punching sleeve is made of amorphous material, and a second magnetic isolation bridge is arranged between the punching sleeve and the magnetic steel slot, and the second magnetic isolation bridge is made of amorphous material.

[0012] Optionally, the punching sheet jacket is multi-layered, adjacent layers are fixed to each other, and the innermost layer is interference fit with the rotor punching sheet.

[0013] Optionally, the punching sheet sheath is formed by winding multiple layers of amorphous material, and the thickness of each layer of the amorphous material is 0.0005-0.2 mm.

[0014] According to a third aspect of the present disclosure, a motor is provided, comprising a stator, a permanent magnet, and the motor rotor core described in the above embodiment.

[0015] A fourth aspect of the present disclosure further provides a vehicle, comprising the motor described in the above embodiment.

[0016] The fifth aspect of the present disclosure also provides a method for manufacturing the motor rotor core described in the above-mentioned embodiment, including: providing the punching sheet block; shearing amorphous material; using amorphous material to make the first magnetic isolation bridge and the second magnetic isolation bridge; assembling the first magnetic isolation bridge, the second magnetic isolation bridge and a plurality of punching sheet blocks to form the rotor punching sheet; axially stacking and fixing the plurality of rotor punching sheets; dipping the stacked and fixed plurality of rotor punching sheets in glue as a whole; using amorphous material to make a punching sheet sleeve; and setting the punching sheet sleeve on the outer wall of the plurality of rotor punching sheets that have been dipped in glue.

[0017] Optionally, assembling the first magnetic isolation bridge, the second magnetic isolation bridge and a plurality of punching sheet blocks to form the rotor punching sheet includes: the first magnetic isolation bridge and the second magnetic isolation bridge are fixedly connected to the corresponding punching sheet blocks by bonding, and are interference fit with adjacent punching sheet blocks.

[0018] Optionally, the punching sheet sleeve made of amorphous material includes: the punching sheet sleeve is made of a strip of amorphous material wound around a plurality of the rotor punching sheets, and the amorphous materials that fit together are fixed by bonding, or the punching sheet sleeve is made of amorphous material by axial stamping and lamination, and is mounted on a plurality of the rotor punching sheets by cold mounting or hot mounting.

[0019] Optionally, the step of providing the punching sheet shield on the outer wall of the plurality of rotor punching sheets that have been dipped in glue comprises: the punching sheet shield and the rotor punching sheets are interference fit.

[0020] Optionally, the step of using amorphous material to form the first magnetic isolation bridge and the second magnetic isolation bridge comprises: forming the first magnetic isolation bridge and the second magnetic isolation bridge by winding, annealing, dipping and shaping an amorphous strip.

[0021] Through the above technical scheme, the advantages of the rotor punching sheet disclosed in the present invention are as follows: the rotor punching sheet disclosed in the present invention comprises a plurality of punching sheet blocks, the plurality of punching sheet blocks are connected by a first magnetic isolation bridge, and a magnetic steel slot for placing a permanent magnet is formed, the first magnetic isolation bridge is made of amorphous material, and the amorphous material has the characteristics of high tensile strength, low saturation magnetic density, low magnetic permeability, etc., so that the motor using the rotor punching sheet disclosed in the present invention can utilize the high strength of the first magnetic isolation bridge to increase the maximum speed of the motor, and utilize the low saturation magnetic density of the first magnetic isolation bridge to reduce the magnetic flux passing through the first magnetic isolation bridge, thereby improving the maximum torque and maximum efficiency of the motor.

[0022] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0024] Figure 1 is a front view of a rotor punching provided in an exemplary embodiment of the present disclosure;

[0025] Figure 2 is a front view of a punching block provided in an exemplary embodiment of the present disclosure;

[0026] Figure 3 is a front view of a rotor punching provided in another exemplary embodiment of the present disclosure;

[0027] Figure 4 is a front view of a punching block provided in another exemplary embodiment of the present disclosure;

[0028] Figure 5 2 is a front view of a motor rotor core provided in an exemplary embodiment of the present disclosure.

[0029] Description of Reference Numerals

[0030] 1-punching sheet block; 2-first punching sheet block; 11-magnetic steel slot; 3-second punching sheet block; 4-third punching sheet block; 5-first magnetic isolation bridge; 6-second magnetic isolation bridge; 7-permanent magnet; 8-punching sheet sheath. DETAILED DESCRIPTION

[0031] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0032] In the present disclosure, unless otherwise stated, the directional words used, such as "up, down, high, low, top, bottom", generally refer to the orientation of the corresponding component or structure in the direction of gravity. "Inside and outside" refer to the inside and outside of the outline of the corresponding component. In addition, it should be noted that the terms used, such as "first, second", etc., are intended to distinguish one element from another and do not have order and importance. In addition, in the description with reference to the accompanying drawings, the same mark in different drawings represents the same element. The above definitions are only used to explain and illustrate the present disclosure and should not be construed as limitations on the present disclosure.

[0033] The present disclosure relates to a rotor punching sheet, see Figure 1 and Figure 2 The rotor sheet is composed of a plurality of sheet blocks 1, and a magnetic steel slot 11 is formed between two adjacent sheet blocks 1 for placing permanent magnets 7, and the two adjacent sheet blocks 1 are also connected by a first magnetic isolation bridge 5, and the permanent magnets 7 in the two adjacent magnetic steel slots 11 are isolated by the first magnetic isolation bridge 5. The first magnetic isolation bridge 5 in the rotor sheet disclosed in the present invention is made of amorphous material. Compared with the magnetic isolation bridge made of silicon steel material in the related art, the magnetic isolation bridge is easily damaged due to insufficient strength when the motor is running at a high speed. The amorphous material has the characteristics of high tensile strength, low saturation magnetic density, and low magnetic permeability, which can make the first magnetic isolation bridge 5 made of amorphous material also have good strength and low saturation magnetic density, so that the motor using the rotor sheet disclosed in the present invention can use the high strength of the first magnetic isolation bridge 5 to increase the maximum speed of the motor, and use the low saturation magnetic density of the first magnetic isolation bridge 5 to reduce the magnetic flux passing through the first magnetic isolation bridge 5, thereby improving the maximum torque and efficiency of the motor.

[0034] In one embodiment of the present disclosure, see Figure 1 and Figure 2, the punching sheet block 1 includes a first punching sheet block 2 and a second punching sheet block 3. The first punching sheet block 2 is circular, and a plurality of second punching sheet blocks 3 are provided, which are spaced along the outer periphery of the first punching sheet block 2 to form a plurality of magnetic steel grooves 11 for placing permanent magnets 7. In this embodiment, the second punching sheet block 3 can be fan-shaped, and two V-shaped magnetic steel grooves 11 are formed between the second punching sheet block 3 and the first punching sheet block 2, and the first magnetic isolation bridge 5 is located at one end of the two adjacent magnetic steel grooves 11 close to each other to isolate the permanent magnets 7 in the magnetic steel grooves 11. By arranging the two adjacent magnetic steel grooves 11 into a V shape, the magnetic field generated by the permanent magnets 7 in the magnetic steel grooves 11 can be increased, thereby improving the efficiency of the motor. Of course, in other embodiments, the first punching sheet block 2 and the second punching sheet block 3 can also be other shapes, or arranged in other ways, which can be determined according to actual conditions, and the present disclosure does not limit this.

[0035] In one embodiment of the present disclosure, see Figure 3 and Figure 4 The punching sheet block 1 also includes a third punching sheet block 4, which is located on the outer periphery of the second punching sheet block 3, and encloses at least two magnetic steel slots 11 with the second punching sheet block 3, and is used to place permanent magnets 7, and the third punching sheet block 4 is also connected to the second punching sheet block 3 through a first magnetic isolation bridge 5, so as to isolate the permanent magnets 7 in the magnetic steel slots 11 through the first magnetic isolation bridge 5. By setting the third punching sheet block 4, more permanent magnets 7 can be accommodated on the rotor punching sheet of the present disclosure, so as to adapt to and manufacture the needs of different types of motors. When the user uses it, the rotor punching sheet with different numbers of permanent magnets 7 can also be selected for use according to the actual requirements of the motor for the magnetic field size on the rotor punching sheet.

[0036] In one embodiment of the present disclosure, see Figure 3 and Figure 4 The third punching sheet block 4 is fan-shaped and located at the center of the second punching sheet block 3, and forms two V-shaped magnetic steel grooves 11 with the second punching sheet block 3 to increase the magnetic field generated by the permanent magnet 7 in the magnetic steel groove 11. The first magnetic isolation bridge 5 is located at one end of two adjacent magnetic steel grooves 11 close to each other to isolate the permanent magnet 7 in the magnetic steel groove 11. Of course, in other embodiments, the second punching sheet block 3 and the third punching sheet block 4 may also be other shapes or arranged in other ways, which may be determined according to actual conditions, and the present disclosure does not limit this.

[0037] In one embodiment of the present disclosure, see Figure 1 and Figure 3The rotor punching also includes a second magnetic isolation bridge 6, which is connected to the outer periphery of the plurality of punching sheet blocks 1 adjacent to the magnetic steel slot 11, and is used to connect to the punching sheet sheath 8, and the second magnetic isolation bridge 6 is also made of amorphous material. By setting the second magnetic isolation bridge 6 made of amorphous material, the characteristics of amorphous material such as high tensile strength, low saturation magnetic density, and low magnetic permeability can be utilized, which can further improve the maximum speed, maximum torque and maximum efficiency of the motor, and also allow users to have more choices when using the rotor punching according to the actual motor power situation to meet the needs of use.

[0038] In one embodiment of the present disclosure, the various punching sheet blocks 1 are made of silicon steel material, and the amorphous material for manufacturing the first magnetic isolation bridge 5 and the second magnetic isolation bridge 6 is one or more of an iron-based amorphous alloy, an iron-nickel-based amorphous alloy, a cobalt-based amorphous alloy, or a nano-amorphous alloy. During manufacturing, different materials can be flexibly selected to manufacture the first magnetic isolation bridge 5 and the second magnetic isolation bridge 6 according to the power requirements, maximum speed, and maximum torque requirements of the rotor punching sheet motor to be used, so as to meet the different usage requirements of the user. Of course, in other embodiments, the various punching sheet blocks 1 can also be made of other materials, and the amorphous material can also include more types, which will not be elaborated here.

[0039] According to a second aspect of the present disclosure, a motor rotor core is provided, comprising a plurality of rotor punchings as described in the above-mentioned embodiments, wherein the plurality of rotor punchings are axially stacked in the rotor core, and a punching sleeve 8 is sleeved on the outer periphery of the plurality of rotor punchings, the punching sleeve 8 is also made of amorphous material, and the motor rotor core of the present disclosure is also provided with a second magnetic isolation bridge 6 made of amorphous material between the punching sleeve 8 and the magnetic steel slot 11 of each rotor punching, the second magnetic isolation bridge 6 can be located at the outer periphery or other positions of the plurality of punching blocks 1 in the rotor punching adjacent to the magnetic steel slot 11, and connected to the punching sleeve 8, and the types of amorphous materials can be referred to the description in the above-mentioned embodiments, which will not be repeated here. By providing a punching sheet sheath 8 and a second magnetic isolation bridge 6 made of amorphous material, the high strength of amorphous material can be utilized to better protect the motor rotor core and avoid damage to the motor rotor core when the motor rotor core rotates at high speed and the centrifugal force produces large tensile stress on the magnetic isolation bridge and the permanent magnet 7. The magnetic conductivity of the amorphous material punching sheet sheath 8 can also be utilized to reduce the equivalent air gap of the motor and improve the power density and torque density of the motor.

[0040] In one embodiment of the present disclosure, see Figure 5, the punching sheet sheath 8 is multi-layered, the adjacent layers are fixedly connected, and the innermost layer is interference fit with the rotor punching sheet. By setting it in this way, the strength of the punching sheet sheath 8 can be increased through the multi-layer structure, so that the punching sheet sheath 8 can play a better protective role on the rotor punching sheet, and the interference fit between the punching sheet sheath 8 and the rotor punching sheet can make the punching sheet sheath 8 wrap the rotor punching sheet more tightly, avoiding damage caused by the gap between the punching sheet sheath 8 and the rotor punching sheet during the operation of the motor, and the superposition of multiple layers of amorphous materials can also play the role of a magnetic shielding layer, effectively reducing the penetration of high-order harmonic magnetic fields into the permanent magnet 7, reducing eddy current losses, and thus improving the use efficiency of the motor. Of course, in other embodiments, the punching sheet sheath 8 can also be of other structures, such as a single-layer structure or other arrangements, which can be determined according to actual conditions, and the present disclosure does not limit this.

[0041] In one embodiment of the present disclosure, see Figure 5 , the punching sheet sheath 8 is wound by an amorphous material, and the thickness of each layer of amorphous material is 0.0005-0.2mm. The manufacturing of the punching sheet sheath 8 by winding can more conveniently control the number of layers and thickness of the punching sheet sheath 8, and the thickness of the amorphous material is 0.0005-0.2mm, which can avoid the thin thickness of the amorphous material, resulting in the punching sheet sheath 8 being difficult to cope with large stress and damage under the condition of high motor speed, or the thick thickness of the amorphous material, resulting in a larger power density and torque density of the motor. Of course, in other embodiments, the punching sheet sheath 8 can also be made in other ways, and the present disclosure does not limit this.

[0042] The third aspect of the present disclosure further provides a motor, comprising the motor rotor core, stator and permanent magnet 7 described in the above embodiment. When manufacturing the motor, a motor rotor core with a suitable number of permanent magnets 7 can be selected for use according to the use requirements to ensure that the motor can be used in more application scenarios, and because the magnetic isolation bridge and punching sheet sheath 8 in the motor rotor core are made of amorphous materials, the motor of the present disclosure can have higher power density, torque density, maximum speed, and higher use efficiency.

[0043] According to a fourth aspect of the present disclosure, a vehicle is provided, comprising the motor described in the above embodiment and having all the beneficial effects of the above motor, which will not be elaborated herein.

[0044] The fifth aspect of the present disclosure also provides a method for manufacturing a motor rotor core, comprising the following steps: providing a suitable punching sheet block 1, processing amorphous material through a shearing process, using amorphous material to make a first magnetic isolation bridge 5 and a second magnetic isolation bridge 6, assembling the first magnetic isolation bridge 5, the second magnetic isolation bridge 6 and a plurality of punching sheet blocks 1 to form a rotor punching sheet, axially stacking and fixing the plurality of rotor punching sheets, dipping the stacked and fixed plurality of rotor punching sheets in glue as a whole, using amorphous material to make a punching sheet sleeve 8, and setting the punching sheet sleeve 8 on the outer wall of the plurality of rotor punching sheets after the dipping, and finally completing the manufacture of the click rotor core.

[0045] In one embodiment of the present disclosure, the first magnetic isolation bridge 5 and the second magnetic isolation bridge 6 are made of amorphous material, including winding, annealing, dipping and shaping the amorphous strip into the first magnetic isolation bridge 5 and the second magnetic isolation bridge 6 of different shapes, for example, they can be any one of rectangular, square, D-shaped, flat or a combination of several shapes, which can be determined according to actual conditions, and the present disclosure does not impose any restrictions on this.

[0046] In one embodiment of the present disclosure, in the process of assembling the first magnetic isolation bridge 5, the second magnetic isolation bridge 6 and the plurality of punching sheet blocks 1 to form the rotor punching sheet, the first magnetic isolation bridge 5, the second magnetic isolation bridge 6 and the plurality of punching sheet blocks 1 are fixedly connected by bonding, and there is an interference fit between the plurality of punching sheet blocks 1 and the first magnetic isolation bridge 5 and the second magnetic isolation bridge 6. Such an arrangement can ensure the stability of the connection between the plurality of punching sheet blocks 1 and the first magnetic isolation bridge 5 and the second magnetic isolation bridge 6.

[0047] In one embodiment of the present disclosure, the punching sheet sheath 8 is made of amorphous material, including winding a strip of amorphous material around a plurality of rotor punching sheets, and the amorphous materials that fit together are fixed by bonding to form the punching sheet sheath 8, or the amorphous material is axially stamped and laminated to form the punching sheet sheath 8, and is then mounted on a plurality of rotor punching sheets by cold mounting or hot mounting.

[0048] In one embodiment of the present disclosure, the punching sleeve 8 is arranged on the outer wall of the plurality of rotor punchings after the resin dipping, and the punching sleeve 8 is interference-fitted with the rotor punching. Such arrangement enables the punching sleeve 8 to wrap the rotor punching more tightly, and avoids damage due to the gap between the punching sleeve 8 and the rotor punching during the operation of the motor.

[0049] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0051] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A motor rotor core, characterized in that: include: The invention comprises a plurality of rotor punchings, wherein the plurality of rotor punchings are stacked in the axial direction, and further comprises a punching sleeve, wherein the punching sleeve is sleeved on the outer periphery of the rotor punching, and the punching sleeve is made of a magnetically conductive amorphous material, and a second magnetic isolation bridge is arranged between the punching sleeve and the magnetic steel slot, and the second magnetic isolation bridge is made of an amorphous material; The rotor punch includes a plurality of punching sheet blocks, and a magnetic steel slot for placing a permanent magnet is formed between two adjacent punching sheet blocks. Two adjacent punching sheet blocks are connected by a first magnetic isolation bridge to isolate adjacent magnetic steel slots, and the first magnetic isolation bridge is made of amorphous material.

2. The motor rotor core according to claim 1, characterized in that: The punching sheet block includes a first punching sheet block and a second punching sheet block. The second punching sheet block is provided in plurality and is spaced apart along the outer periphery of the first punching sheet block. The second punching sheet block is fan-shaped. Two V-shaped magnetic steel grooves are formed between each of the second punching sheet blocks and the first punching sheet block. The first magnetic isolation bridge is located at one end of two adjacent magnetic steel grooves that are close to each other.

3. The motor rotor core according to claim 2, characterized in that: The punching sheet block also includes a third punching sheet block, which is located on the outer periphery of the second punching sheet block and is connected to the second punching sheet block through the first magnetic isolation bridge, and surrounds at least two magnetic steel slots for placing the permanent magnets.

4. The motor rotor core according to claim 3, characterized in that: The third punching sheet block is fan-shaped, located at the center of the second punching sheet block, and forms two V-shaped magnetic steel grooves between the third punching sheet block and the second punching sheet block.

5. The motor rotor core according to claim 1, characterized in that: The punching sheet block is made of silicon steel material, and the amorphous material is one or more of an iron-based amorphous alloy, an iron-nickel-based amorphous alloy, a cobalt-based amorphous alloy or a nano-amorphous alloy.

6. The motor rotor core according to any one of claims 1 to 5, characterized in that: The second magnetic isolation bridge is connected to the outer periphery of the plurality of punching sheet blocks adjacent to the magnetic steel slots, and is used to be connected to the punching sheet sheath.

7. The motor rotor core according to claim 1, characterized in that: The punching sheet jacket is multi-layered, adjacent layers are fixed to each other, and the innermost layer is interference-fitted with the rotor punching sheet.

8. The motor rotor core according to claim 7, characterized in that: The punching sheet sheath is formed by winding multiple layers of amorphous material, and the thickness of each layer of the amorphous material is 0.0005-0.2 mm.

9. A motor, characterized in that: The invention comprises a stator, a permanent magnet, and a motor rotor core as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: The invention comprises the motor as claimed in claim 9.

11. A method for manufacturing a motor rotor core according to any one of claims 1 to 8, characterized in that: include: Providing the punching block; Shearing of amorphous materials; The first magnetic isolation bridge and the second magnetic isolation bridge are made of amorphous material; Assembling the first magnetic isolation bridge, the second magnetic isolation bridge and a plurality of punching sheet blocks to form the rotor punching sheet; Stacking and fixing a plurality of the rotor punching sheets in the axial direction; Dipping the stacked and fixed rotor punching sheets into glue as a whole; The punching sleeve is made of amorphous material; and The punching sheet shield is arranged on the outer wall of the plurality of rotor punching sheets after the dip-coating.

12. The method for manufacturing a motor rotor core according to claim 11, characterized in that: The step of assembling the first magnetic isolation bridge, the second magnetic isolation bridge and a plurality of punching sheet blocks to form the rotor punching sheet comprises: The first magnetic isolation bridge and the second magnetic isolation bridge are fixedly connected to the corresponding punching sheet blocks by bonding, and are interference-fitted with the adjacent punching sheet blocks.

13. The method for manufacturing a motor rotor core according to claim 11, characterized in that: The punching sheet sheath made of amorphous material comprises: The punching sheet sheath is formed by winding a strip of amorphous material around a plurality of the rotor punching sheets, and the amorphous materials that fit each other are fixed by bonding, or The punching sheet shield is made of amorphous material by axial stamping and lamination, and is sleeved on the plurality of rotor punching sheets by cold fitting or hot fitting.

14. The method for manufacturing a motor rotor core according to claim 11, characterized in that: The step of providing the punching sheet sheath on the outer wall of the plurality of rotor punching sheets after the dip-coating process comprises: The punching sheet sleeve is interference fit with the rotor punching sheet.

15. The method for manufacturing a motor rotor core according to claim 11, characterized in that: The first magnetic isolation bridge and the second magnetic isolation bridge made of amorphous material include: The amorphous strip is manufactured into the first magnetic isolation bridge and the second magnetic isolation bridge by winding, annealing, resin dipping and shaping.

Images