Motor punching sheet

Abstract

The utility model discloses a motor punching sheet, comprising a rotor punching sheet, the center position of the rotor punching sheet is provided with an installation hole for installing a rotating shaft, the rotor punching sheet is provided with magnetic steel grooves distributed in the circumferential direction, and the inner wall of one side, close to the installation hole, of the middle part of each magnetic steel groove is recessed inwards to form a projection. The inner walls of the magnetic steel grooves on the two sides of the protrusions are recessed back to the magnetic steel grooves to form grooves, and the protrusions and the opposite inner walls of the magnetic steel grooves form glue grooves. According to the motor punching sheet in the scheme, the glue grooves are arranged in the magnetic steel grooves, so that the bonding efficiency of the magnetic steel in the magnetic steel grooves is improved. In actual operation, the surface of the magnetic steel is coated with an adhesive, the magnetic steel is inserted into the magnetic steel groove, then the adhesive is injected into the glue groove, and the adhesive permeates the gap between the magnetic steel and the magnetic steel groove, so that the bonding surface of the magnetic steel is increased, the bonding effect of the magnetic steel in the magnetic steel groove is improved, the movement of the magnetic steel in the rotor punching sheet is reduced, the noise is reduced, and the stability of the whole motor during operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor manufacturing, in particular to a motor punching sheet. Background Art

[0002] Motor laminations primarily include stator laminations and rotor laminations. Stator laminations are used in the stator portion of a motor, while rotor laminations are used in the rotor portion. Stator laminations are stamped from silicon steel sheets and come in various sizes to accommodate stators for motors of varying power. Rotor laminations are installed at the connection points of the motor rotor, primarily conducting current and withstanding electromagnetic forces. Depending on their shape, rotor laminations can be categorized as circular, sector-shaped, and pole-shaped. The magnet in the rotor is a permanent magnet, typically embedded in or bonded to the iron core of the motor rotor. The magnet's primary function is to generate a stable magnetic field, thereby driving the motor.

[0003] In existing motor punchings, when embedded magnets are used, magnet slots are provided on the rotor punchings. In order to fix the magnets in the rotor, glue needs to be applied to the surface of the magnets and then inserted into the magnet slots. This makes it difficult to control the amount of glue and causes uneven glue adhesion, which affects the stability of the magnets in the magnet slots.

[0004] For example, Chinese patent publication number CN220732458U, publication date April 5, 2024, is titled "A connection structure between a rotor core and a magnet", and includes a number of rotor cores and at least two magnets. The rotor core is provided with at least two plug-in holes along the circumferential direction, and a first elastic member and a second elastic member are respectively provided on both sides of the plug-in hole. The first elastic member is provided with a first deformation gap on the side away from the plug-in hole, and the second elastic member is provided with a second deformation gap on the side away from the plug-in hole. Several rotor cores are stacked in the vertical direction, and the plug-in holes, the first deformation gap and the second deformation gap all pass through the several rotor cores in the vertical direction. The magnet is inserted into the plug-in hole in the vertical direction, and the two sides of the magnet are respectively in contact with the first elastic member and the second elastic member on each rotor core.

[0005] The disadvantages of the existing patent are: in the existing motor punching, when embedded magnets are used, magnet slots are provided on the rotor punching. In order to fix the magnets in the rotor, glue needs to be applied to the surface of the magnets and then inserted into the magnet slots. This makes it difficult to control the amount of glue and causes uneven glue adhesion, which affects the stability of the magnets in the magnet slots. Utility Model Content

[0006] The purpose of the utility model is to solve the problem that the magnetic steel glue in the magnetic steel slot of the existing motor punching is uneven, resulting in weak stability of the magnetic steel in the magnetic steel slot, and to provide a motor punching that improves the bonding stability of the magnetic steel in the magnetic steel slot.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A motor punching includes a rotor punching, wherein a mounting hole for mounting a rotating shaft is provided at the center of the rotor punching, and circumferentially distributed magnetic steel grooves are provided on the rotor punching, wherein the inner wall of the middle part of the magnetic steel groove near the mounting hole is recessed inward to form a protrusion, and the inner walls of the magnetic steel groove on both sides of the protrusion are recessed in the direction opposite to the magnetic steel groove to form a groove, and the protrusion and the inner wall of the magnetic steel groove opposite to it form a glue groove. The motor punching described in this scheme improves the bonding efficiency of the magnet in the magnetic steel groove by providing a glue groove in the magnetic steel groove. In actual operation, adhesive is applied to the surface of the magnet and inserted into the magnetic steel groove, and then adhesive is injected into the glue groove. The adhesive penetrates the gap between the magnet and the magnetic steel groove, thereby increasing the bonding surface of the magnet, improving the bonding effect of the magnet in the magnetic steel groove, reducing the movement of the magnet in the rotor punching, reducing noise, and improving the stability of the overall motor during operation.

[0009] On the one hand, the protrusion forms a glue groove on the inner wall of the magnetic steel slot opposite to it, which is used to improve the bonding performance of the magnetic steel in the magnetic steel slot; on the other hand, it plays the role of limiting the magnetic steel. The end of the magnetic steel abuts on the protrusion, which also reduces the shaking of the magnetic steel.

[0010] While the ends of the magnetic steel abut against the protrusions, the inner walls of the magnetic steel slots on either side of the protrusions are recessed away from the magnetic steel slots to form grooves. These grooves relieve stress, reduce weight, and reduce magnetic flux leakage, minimizing the interaction between the magnetic steels, thereby improving the overall performance and reliability of the motor. The weight-reducing grooves help reduce the weight of the rotor punchings, lowering the rotor's moment of inertia during rotation, reducing the impact of inertia on the rotor, and improving the rotor's smoothness during deceleration.

[0011] Preferably, the protrusions are distributed along the radius of the rotor sheet. The protrusions are located in the middle of the magnetic steel slots, and the magnets inserted into the magnetic steel slots are symmetrically arranged on both sides of the protrusions, so that the adhesive in the glue grooves evenly penetrates the gap between the magnetic steel slots and the magnets.

[0012] Preferably, the extending direction of the groove on any one of the magnetic steel slots is arranged parallel to the extending direction of the protrusion on the magnetic steel slot.

[0013] Preferably, the grooves on any one of the magnetic steel slots are symmetrically arranged relative to the protrusions on the magnetic steel slot. This reduces the impact on the two magnets in the magnetic steel slot and evenly distributes the magnets, ensuring accurate installation of the magnets and preventing them from loosening or slipping, thereby ensuring long-term normal, reliable, and safe operation of the rotor.

[0014] Preferably, an elastic groove is provided on the inner wall of the protrusion, which is recessed in the direction opposite to the magnetic steel slot. The elastic groove is used to fix the magnetic steel inserted into the magnetic steel slot, stabilizes and dampens the magnetic steel inserted into the magnetic steel slot, reduces noise, and thus improves the overall performance and reliability of the motor.

[0015] Preferably, the magnetic steel slots are provided with magnetic isolation slots at both ends, with a step formed between the magnetic isolation slots and the magnetic steel slots. The step mates with the elastic groove of the protrusion, with one end of the magnetic steel abutting the step and the other end abutting the protrusion. This stabilizes the magnetic steel, reduces noise, and thus improves the overall performance and reliability of the motor.

[0016] Preferably, the magnetic steel slot is a straight slot, and a magnetic rib is formed between the magnetic isolation slots on two adjacent magnetic steel slots. The magnetic isolation slot works by changing the magnetic field distribution of the motor. It uses the effect of magnetic resistance to make the magnetic field produce greater resistance at the magnetic isolation slot, thereby suppressing the cross-axis magnetic potential and increasing the air gap magnetic density and electromagnetic torque of the motor. In addition, the design of the magnetic isolation slot can also optimize the magnetic field distribution of the motor, reduce the non-uniformity of the magnetic field, and further improve the efficiency and performance of the motor. The length direction of the magnetic isolation slot is perpendicular to the extension direction of the protrusion, and the protrusion extends along the radius direction of the rotor punching.

[0017] Preferably, the rotor punchings are provided with weight-reducing holes distributed circumferentially about the central axis of the mounting holes, and the weight-reducing holes are evenly distributed circumferentially of the rotor punchings. The weight-reducing holes facilitate reducing the weight of the rotor punchings, lowering the moment of inertia of the rotor during rotation, reducing the effects of inertia on the rotor, and improving the stability of the rotor during deceleration.

[0018] Preferably, it further comprises a stator punching sheet, wherein the stator punching sheet comprises a stator yoke and stator teeth protruding from the inner wall of the stator yoke.

[0019] Preferably, the stator laminations have nine stator teeth, and the rotor laminations have six magnetic slots. A six-pole, nine-slot lamination design is employed. The rotor has three pairs of poles (six poles), and the stator has nine slots, creating a three-phase Y-shaped winding that is optimally suited to the operating characteristics of refrigerator compressors and provides high motor efficiency. The stator winding design is synchronized with the controller, working in conjunction with the controller. Each winding parameter design is tailored to a specific controller program, optimizing the operating curve of the motor-compressor-refrigerator combination. The rotor magnets are internally inserted. The harsh refrigerant and refrigeration oil operating conditions of the compressor can easily cause surface-mounted magnets to adhere loosely. Internally inserted magnets simplify the process and eliminate the risk of magnets falling off. The use of strong NdFeB magnets ensures superior motor performance after downsizing.

[0020] Therefore, the utility model has the following beneficial effects: increasing the bonding surface of the magnet, improving the bonding effect of the magnet in the magnet slot, reducing the movement of the magnet in the rotor punching, reducing noise, and improving the stability of the entire motor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the second embodiment of the present utility model.

[0022] Figure 2 This is a structural diagram of the rotor punching in the second embodiment of the present utility model.

[0023] Figure 3 This is a structural diagram of the rotor punching in the third embodiment of the present invention.

[0024] As shown in the picture:

[0025] Rotor punching 1, mounting hole 1.1, magnetic steel slot 1.2, protrusion 1.3, elastic slot 1.3.1, groove 1.4, glue slot 1.5, step 1.6, magnetic isolation slot 1.7, weight reduction hole 1.8,

[0026] Stator punching 2, stator yoke 2.1, stator teeth 2.2. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the technical solution of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Example 1, as Figure 1 、 Figure 2 As shown, a motor punching comprises a rotor punching 1, a mounting hole 1.1 for mounting a rotating shaft being provided at the center of the rotor punching 1, circumferentially distributed magnetic steel slots 1.2 being provided on the rotor punching 1, an inner wall on one side of the middle portion of the magnetic steel slot 1.2 close to the mounting hole 1.1 being recessed inward to form a protrusion 1.3, inner walls of the magnetic steel slot 1.2 on both sides of the protrusion 1.3 being recessed in the direction away from the magnetic steel slot 1.2 to form grooves 1.4, and the inner wall of the magnetic steel slot 1.2 opposite to the protrusion 1.3 forming a glue groove 1.5.

[0029] The motor laminations mainly include stator laminations 2 and rotor laminations 1. Stator laminations 2 are used for the stator part of the motor, while rotor laminations 1 are used for the rotor part of the motor. Stator laminations 2 are stamped from silicon steel sheets and have different specifications to meet the needs of motor stators of different powers. Rotor laminations 1 are installed at the connection part of the motor rotor, mainly playing the role of conducting current and bearing electromagnetic force. Depending on the shape, rotor laminations 1 can be divided into circular laminations, fan-shaped laminations and pole laminations. The magnet in the rotor is a permanent magnet, usually embedded or glued to the iron core of the motor rotor. The main function of the magnet is to generate a stable magnetic field, thereby driving the operation of the motor.

[0030] In existing motor punchings, when embedded magnets are used, a magnet slot 1.2 is provided on the rotor punching 1. In order to fix the magnets in the rotor, glue needs to be applied to the surface of the magnet and then inserted into the magnet slot 1.2. This makes it difficult to control the amount of glue and causes uneven glue adhesion, affecting the stability of the magnet in the magnet slot 1.2.

[0031] In order to solve the problem of uneven glue bonding of the magnetic steel in the magnetic steel slot 1.2 of the existing motor punching, resulting in weak stability of the magnetic steel in the magnetic steel slot 1.2, the above embodiment provides a motor punching that improves the bonding stability of the magnetic steel in the magnetic steel slot 1.2. The motor punching is provided with a glue groove 1.5 in the magnetic steel slot 1.2 to improve the bonding efficiency of the magnetic steel in the magnetic steel slot 1.2. In actual operation, adhesive is applied to the surface of the magnetic steel and inserted into the magnetic steel slot 1.2. Then, adhesive is injected into the glue groove 1.5. The adhesive penetrates the gap between the magnetic steel and the magnetic steel slot 1.2, increases the bonding surface of the magnetic steel, improves the bonding effect of the magnetic steel in the magnetic steel slot 1.2, reduces the movement of the magnetic steel in the rotor punching 1, reduces noise, and improves the stability of the overall motor during operation.

[0032] The protrusion 1.3, on the one hand, forms a glue groove 1.5 on the inner wall of the magnetic steel groove 1.2 opposite to it, for improving the bonding performance of the magnetic steel in the magnetic steel groove 1.2; on the other hand, it acts as a limit for the magnetic steel, and the end of the magnetic steel abuts against the protrusion 1.3, which also reduces the shaking of the magnetic steel.

[0033] While the ends of the magnetic steel abut against the protrusions 1.3, the inner walls of the magnetic steel slots 1.2 on either side of the protrusions 1.3 are recessed away from the magnetic steel slots 1.2 to form grooves 1.4. These grooves 1.4 relieve stress, reduce weight, and reduce magnetic flux leakage, thereby minimizing the interaction between the magnetic steels and improving the overall performance and reliability of the motor. The weight-reducing effect of the grooves 1.4 helps reduce the weight of the rotor punching 1, lowering the rotor's moment of inertia during rotation, reducing the impact of inertia on the rotor, and improving the rotor's smoothness during deceleration.

[0034] Example 2, as Figure 1 、 Figure 2 As shown, a motor punching comprises a rotor punching 1, a mounting hole 1.1 for mounting a rotating shaft being provided at the center of the rotor punching 1, circumferentially distributed magnetic steel slots 1.2 being provided on the rotor punching 1, an inner wall on one side of the middle portion of the magnetic steel slot 1.2 close to the mounting hole 1.1 being recessed inward to form a protrusion 1.3, inner walls of the magnetic steel slot 1.2 on both sides of the protrusion 1.3 being recessed in the direction away from the magnetic steel slot 1.2 to form grooves 1.4, and the inner wall of the magnetic steel slot 1.2 opposite to the protrusion 1.3 forming a glue groove 1.5.

[0035] The protrusion 1.3 is further optimized and distributed along the radius of the rotor sheet 1. The protrusion 1.3 is located in the middle of the magnetic steel slot 1.2, and the magnets inserted in the magnetic steel slot 1.2 are symmetrically arranged on both sides of the protrusion 1.3, so that the adhesive in the glue groove 1.5 evenly penetrates the gap between the magnetic steel slot 1.2 and the magnet.

[0036] The groove 1.4 is further optimized so that the extension direction of the groove 1.4 on any magnetic steel groove 1.2 is arranged parallel to the extension direction of the protrusion 1.3 on the magnetic steel groove 1.2.

[0037] The grooves 1.4 are further optimized so that the grooves 1.4 on any one of the magnetic steel slots 1.2 are symmetrically arranged relative to the protrusions 1.3 on the magnetic steel slot 1.2. This reduces the impact on the two magnets in the magnetic steel slot 1.2 and evenly distributes the magnets, ensuring accurate magnet installation and preventing them from loosening or slipping, thereby ensuring long-term normal, reliable, and safe operation of the rotor.

[0038] In this embodiment, magnetic isolation grooves 1.7 are provided at both ends of the magnetic steel groove 1.2, and a step portion 1.6 is formed between the magnetic isolation groove 1.7 and the magnetic steel groove 1.2.

[0039] Specifically, the magnetic steel slot 1.2 is a straight slot, and a magnetic rib is formed between the magnetic isolation slots 1.7 on two adjacent magnetic steel slots 1.2. The magnetic isolation slots 1.7 work by changing the magnetic field distribution of the motor. It uses the effect of magnetic resistance to make the magnetic field produce greater resistance at the magnetic isolation slots 1.7, thereby suppressing the cross-axis magnetic potential and increasing the air gap magnetic density and electromagnetic torque of the motor. In addition, the design of the magnetic isolation slots 1.7 can also optimize the magnetic field distribution of the motor, reduce the unevenness of the magnetic field, and further improve the efficiency and performance of the motor. The length direction of the magnetic isolation slots 1.7 is set perpendicular to the extension direction of the protrusion 1.3, and the protrusion 1.3 extends along the radial direction of the rotor punching 1.

[0040] The rotor sheet 1 is further optimized by providing weight-reducing holes 1.8 distributed circumferentially about the central axis of the mounting hole 1.1. The weight-reducing holes 1.8 are evenly distributed around the circumference of the rotor sheet 1. These weight-reducing holes 1.8 help reduce the weight of the rotor sheet 1, lowering the moment of inertia of the rotor during rotation, reducing the impact of inertia on the rotor, and improving the stability of the rotor during deceleration.

[0041] In this embodiment, a stator punching sheet 2 is further included. The stator punching sheet 2 includes a stator yoke 2.1 and stator teeth 2.2 protruding from the inner wall of the stator yoke 2.1.

[0042] The stator laminations 2 have been further optimized. The number of stator teeth 2.2 on the stator laminations 2 is 9, and the number of magnetic slots 1.2 on the rotor laminations 1 is 6. A 6-pole, 9-slot lamination design is adopted. The rotor has three pairs of poles (6 poles) and the stator has nine slots, creating a three-phase Y-shaped winding that is optimally suited to the operating characteristics of refrigerator compressors and provides high motor efficiency. The stator winding design is synchronized with the controller, working in conjunction with the controller. Each winding parameter is designed specifically for a controller program to optimize the operating curve of the motor-compressor-refrigerator combination. The rotor magnets are internally inserted. The harsh refrigerant and refrigeration oil operating conditions of the compressor can easily cause surface-mounted magnets to adhere poorly. Internally inserted magnets simplify the manufacturing process and eliminate the risk of magnets falling. The use of NdFeB magnets, with their strong magnetism, ensures superior motor performance even after the downsizing.

[0043] This embodiment has the following beneficial effects: increasing the bonding surface of the magnet, improving the bonding effect of the magnet in the magnet slot 1.2, reducing the movement of the magnet in the rotor punching 1, reducing noise, and improving the stability of the entire motor during operation; reducing the impact on the two magnets in the magnet slot 1.2, and evenly distributing the magnets can ensure the accurate installation position of the magnets, avoid loosening or slipping of the magnets, and thus ensure the long-term normal, reliable and safe operation of the rotor.

[0044] Example 3, as Figure 1 、 Figure 2As shown, a motor punching comprises a rotor punching 1, wherein a mounting hole 1.1 for mounting a rotating shaft is provided at the center of the rotor punching 1, and circumferentially distributed magnetic steel slots 1.2 are provided on the rotor punching 1, and the inner wall of the middle part of the magnetic steel slot 1.2 near the mounting hole 1.1 is recessed inward to form a protrusion 1.3, and the inner walls of the magnetic steel slot 1.2 on both sides of the protrusion 1.3 are recessed in the direction away from the magnetic steel slot 1.2 to form grooves 1.4, and the inner walls of the magnetic steel slot 1.2 opposite to the protrusion 1.3 form glue grooves 1.5. An elastic groove 1.3.1 is provided on the inner wall of the protrusion 1.3, which is recessed in the direction away from the magnetic steel slot 1.2. The elastic groove 1.3.1 is used to fix the magnet inserted into the magnetic steel slot 1.2, and has a stabilizing and shock-absorbing effect on the magnet inserted into the magnetic steel slot 1.2, reducing noise, and thereby improving the overall performance and reliability of the motor. Magnetic isolation slots 1.7 are located at both ends of the magnetic steel slot 1.2, forming a step 1.6 between the magnetic isolation slot 1.7 and the magnetic steel slot 1.2. This step 1.6 mates with the elastic groove 1.3.1 of the protrusion 1.3, with one end of the magnetic steel abutting against the step 1.6 and the other end against the protrusion 1.3. This stabilizes the magnetic steel, reduces noise, and improves the overall performance and reliability of the motor.

[0045] The protrusion 1.3 is further optimized and distributed along the radius of the rotor sheet 1. The protrusion 1.3 is located in the middle of the magnetic steel slot 1.2, and the magnets inserted in the magnetic steel slot 1.2 are symmetrically arranged on both sides of the protrusion 1.3, so that the adhesive in the glue groove 1.5 evenly penetrates the gap between the magnetic steel slot 1.2 and the magnet.

[0046] The groove 1.4 is further optimized so that the extension direction of the groove 1.4 on any magnetic steel groove 1.2 is arranged parallel to the extension direction of the protrusion 1.3 on the magnetic steel groove 1.2.

[0047] The grooves 1.4 are further optimized so that the grooves 1.4 on any one of the magnetic steel slots 1.2 are symmetrically arranged relative to the protrusions 1.3 on the magnetic steel slot 1.2. This reduces the impact on the two magnets in the magnetic steel slot 1.2 and evenly distributes the magnets, ensuring accurate magnet installation and preventing them from loosening or slipping, thereby ensuring long-term normal, reliable, and safe operation of the rotor.

[0048] Specifically, the magnetic steel slot 1.2 is a straight slot, and a magnetic rib is formed between the magnetic isolation slots 1.7 on two adjacent magnetic steel slots 1.2. The magnetic isolation slots 1.7 work by changing the magnetic field distribution of the motor. It uses the effect of magnetic resistance to make the magnetic field produce greater resistance at the magnetic isolation slots 1.7, thereby suppressing the cross-axis magnetic potential and increasing the air gap magnetic density and electromagnetic torque of the motor. In addition, the design of the magnetic isolation slots 1.7 can also optimize the magnetic field distribution of the motor, reduce the unevenness of the magnetic field, and further improve the efficiency and performance of the motor. The length direction of the magnetic isolation slots 1.7 is set perpendicular to the extension direction of the protrusion 1.3, and the protrusion 1.3 extends along the radial direction of the rotor punching 1.

[0049] The rotor sheet 1 is further optimized by providing weight-reducing holes 1.8 distributed circumferentially about the central axis of the mounting hole 1.1. The weight-reducing holes 1.8 are evenly distributed around the circumference of the rotor sheet 1. These weight-reducing holes 1.8 help reduce the weight of the rotor sheet 1, lowering the moment of inertia of the rotor during rotation, reducing the impact of inertia on the rotor, and improving the stability of the rotor during deceleration.

[0050] In this embodiment, a stator punching sheet 2 is further included. The stator punching sheet 2 includes a stator yoke 2.1 and stator teeth 2.2 protruding from the inner wall of the stator yoke 2.1.

[0051] The stator laminations 2 have been further optimized. The number of stator teeth 2.2 on the stator laminations 2 is 9, and the number of magnetic slots 1.2 on the rotor laminations 1 is 6. A 6-pole, 9-slot lamination design is adopted. The rotor has three pairs of poles (6 poles) and the stator has nine slots, creating a three-phase Y-shaped winding that is optimally suited to the operating characteristics of refrigerator compressors and provides high motor efficiency. The stator winding design is synchronized with the controller, working in conjunction with the controller. Each winding parameter is designed specifically for a controller program to optimize the operating curve of the motor-compressor-refrigerator combination. The rotor magnets are internally inserted. The harsh refrigerant and refrigeration oil operating conditions of the compressor can easily cause surface-mounted magnets to adhere poorly. Internally inserted magnets simplify the manufacturing process and eliminate the risk of magnets falling. The use of NdFeB magnets, with their strong magnetism, ensures superior motor performance even after the downsizing.

[0052] This embodiment has the following beneficial effects: increasing the bonding surface of the magnet, improving the bonding effect of the magnet in the magnet slot 1.2, reducing the movement of the magnet in the rotor punching 1, reducing noise, and improving the stability of the entire motor during operation; reducing the impact on the two magnets in the magnet slot 1.2, and evenly distributing the magnets can ensure the accurate installation position of the magnets, avoid loosening or slipping of the magnets, and thus ensure the long-term normal, reliable and safe operation of the rotor.

[0053] The specific embodiments described above are only preferred implementations of the present invention and are not intended to limit the specific scope of implementation of the present invention. All equivalent changes made to the shape and structure of the present invention should be included in the scope of protection of the present invention.

Claims

1. A motor punching, including a rotor punching, wherein a mounting hole for mounting a rotating shaft is provided at the center of the rotor punching, wherein: The rotor punching is provided with circumferentially distributed magnetic steel grooves, the inner wall of the middle part of the magnetic steel groove close to the mounting hole is recessed inward to form a protrusion, the inner walls of the magnetic steel groove on both sides of the protrusion are recessed in the direction away from the magnetic steel groove to form grooves, and the protrusion and the inner wall of the magnetic steel groove opposite to it form a glue groove.

2. A motor punching sheet according to claim 1, characterized in that: The protrusions are distributed along the radial direction of the rotor punching sheet.

3. A motor punching sheet according to claim 2, characterized in that: The extending direction of the groove on any one of the magnetic steel slots is arranged parallel to the extending direction of the protrusion on the magnetic steel slot.

4. A motor punching sheet according to claim 1, 2 or 3, characterized in that: The grooves on any one of the magnetic steel slots are symmetrically arranged according to the protrusions on the magnetic steel slot.

5. A motor punching sheet according to claim 1, 2 or 3, characterized in that: An elastic groove is provided on the inner wall of the protrusion and is recessed in the direction opposite to the magnetic steel groove.

6. A motor punching sheet according to claim 1, 2 or 3, characterized in that: Magnetic isolation grooves are provided at both ends of the magnetic steel groove, and a step portion is formed between the magnetic isolation groove and the magnetic steel groove.

7. A motor punching sheet according to claim 6, characterized in that: The magnetic steel slots are straight slots, and magnetic ribs are formed between the magnetic isolation slots on two adjacent magnetic steel slots.

8. A motor punching sheet according to claim 1, 2 or 3, characterized in that: The rotor punching is provided with weight-reducing holes distributed circumferentially according to the central axis of the mounting hole, and the weight-reducing holes are evenly distributed in the circumferential direction of the rotor punching.

9. A motor punching sheet according to claim 1, 2 or 3, characterized in that: It also includes a stator punching sheet, which includes a stator yoke and stator teeth protruding on the inner wall of the stator yoke.

10. The motor punching sheet according to claim 9, characterized in that: The number of stator teeth on the stator punching sheet is 9, and the number of magnetic steel slots on the rotor punching sheet is 6.

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