Rotor punching sheet, rotor iron core, rotor assembly and motor

Abstract

The invention provides a rotor punching sheet, a rotor core, a rotor assembly and a motor. The rotor punching sheet comprises a body (2) and a plurality of magnetic steel through holes (3), the plurality of magnetic steel through holes (3) are arranged on the body (2) at intervals along the circumferential direction, a plurality of plane areas are formed between the adjacent magnetic steel through holes (3), at least part of the plane areas are provided with first oil grooves (21), and preset intervals are arranged between the first oil grooves (21) and the outer periphery of the body (2). According to the rotor punching sheet, the rotor iron core, the rotor assembly and the motor provided by the invention, the problem that the anti-rust grease of the existing servo motor is easy to volatilize and splash to other parts to influence the operation stability and safety of the motor can be solved.

Description

Technical Field

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

[0002] Motors, especially servo motors, as a high-precision power actuator, are widely used in scenarios that require precise control of position, speed and torque. Its most common application scenarios include CNC machine tools, robot arms, precision assembly equipment, and industrial automation equipment such as the aerospace field. The significance of servo motors lies in that they can achieve high-precision motion control and meet the pursuit of automation, intelligence and high efficiency in modern industrial production. In robotics technology, servo motors are the key to achieving the flexibility and accuracy of robot movements. They can help robots complete complex operations such as handling, welding, assembly, etc., thereby improving the automation level of the manufacturing process, reducing labor costs, and improving production quality.

[0003] In the production and storage process of existing servo motors, anti-rust grease is usually used to prevent the rust of metal parts inside the motor. Anti-rust grease is usually applied to the surface of metal parts such as bearings and gears of the motor to form a protective film to isolate moisture and corrosive substances in the air and achieve the effect of rust prevention. However, there are some problems with the setting method of anti-rust grease of existing servo motors. First, under high temperature or long-term storage conditions, the anti-rust grease may accelerate volatilization, resulting in the thinning of the anti-rust grease layer, weakening of the anti-rust effect, and even re-exposure of metal parts to the corrosive environment, causing rust. In addition, the volatile grease may pollute other parts of the servo motor, such as electronic components such as circuit boards and sensors, affecting their normal functions. Secondly, during the operation of the servo motor, especially in the high-speed rotation state, the anti-rust grease may splash due to the centrifugal force, which will not only pollute the internal environment of the motor, but also may adhere to other moving parts of the servo motor, affecting the operating efficiency and life of the motor. More seriously, the splashing grease may enter the precision control components of the motor, causing control failure and even safety accidents. Summary of the invention

[0004] The main purpose of the present invention is to provide a rotor punching, a rotor core, a rotor assembly and a motor, which can solve the problem that the anti-rust grease of the existing servo motor is easy to evaporate and splash onto other parts, affecting the running stability and safety of the motor.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a rotor punching sheet is provided, comprising a main body and a plurality of magnetic steel through holes, wherein the plurality of magnetic steel through holes are arranged on the main body at intervals along the circumferential direction, and a plurality of planar areas are formed between adjacent magnetic steel through holes, and a first oil groove is opened on at least part of the planar areas, and the first oil groove has a preset interval with the outer periphery of the main body.

[0006] Furthermore, a second oil groove and an axial hole are also provided on the main body. The second oil groove extends radially inwardly along the main body and communicates with the first oil groove and the axial hole.

[0007] Furthermore, a first oil groove is provided between any two adjacent magnetic steel through holes.

[0008] Furthermore, the first oil groove is arc-shaped and extends in the circumferential direction.

[0009] Furthermore, assuming that the number of rotor poles is p, the angular range of the first oil groove is [180° / p, 360° / p).

[0010] Furthermore, the plurality of first oil grooves are arranged at intervals in the radial direction, and the second oil groove connects the plurality of first oil grooves with the shaft hole.

[0011] Furthermore, the width of the second oil groove gradually increases from inside to outside along the radial direction of the body.

[0012] Furthermore, the circumferential lengths of the plurality of first oil grooves gradually increase from inside to outside along the radial direction of the body.

[0013] Furthermore, the widths of the plurality of first oil grooves are equal.

[0014] Furthermore, the widths of the plurality of first oil grooves gradually increase or decrease from inside to outside along the radial direction of the body.

[0015] Furthermore, the main body is also provided with positioning parts, and a plurality of positioning parts are arranged at intervals along the circumferential direction.

[0016] Furthermore, the positioning portion includes a first positioning portion and a second positioning portion, the first positioning portion is a protrusion arranged on the first surface of the body, and the second positioning portion is a recess arranged at a position on the second surface of the body corresponding to the first positioning portion.

[0017] According to another aspect of the present invention, a rotor core is provided, comprising a plurality of stacked rotor punchings, wherein the rotor punchings are the above-mentioned rotor punchings, and when the plurality of rotor punchings comprise a first positioning portion and a second positioning portion, the first positioning portions on a plurality of bodies are crimped and fixed to the second positioning portions on adjacent bodies.

[0018] According to another aspect of the present invention, a rotor assembly is provided, including a rotor core and a rotating shaft, wherein the rotor core is sleeved on the rotating shaft, and the rotor core is the above-mentioned rotor core.

[0019] Further, when the rotor core includes the second oil grooves, a first oil channel is provided on the side wall of the shaft hole of the rotor core, and the first oil channel extends in the axial direction and is connected to the plurality of second oil grooves.

[0020] Furthermore, when the rotor core includes a first oil groove and a second oil groove, multiple first oil grooves located under the same pole form a second oil channel, and multiple second oil grooves located under the same pole form a third oil channel. A first oil channel is provided on the rotating shaft, and the third oil channel connects the first oil channel and the second oil channel.

[0021] Furthermore, there are multiple first oil passages and multiple third oil passages, multiple first oil passages are arranged at circumferential intervals along the rotating shaft, and multiple third oil passages are arranged at circumferential intervals along the rotor core, and the first oil passages and the third oil passages located at the same circumferential position are correspondingly connected.

[0022] Furthermore, two punching end plates are crimped and fixed on the end face of the rotor core, and the punching end plates close the first oil passage, the second oil passage and the third oil passage from the end face, and the corresponding connected first oil passage, the second oil passage and the third oil passage form a closed circulating oil chamber.

[0023] Furthermore, the rotor assembly also includes a punching end plate. When the rotor core includes a magnetic steel through hole and a positioning portion, the punching end plate includes a magnetic steel through hole and a positioning portion.

[0024] According to another aspect of the present invention, a motor is provided, comprising a rotor assembly, wherein the rotor assembly is the above-mentioned rotor assembly.

[0025] By applying the technical solution of the present invention, the body is mainly used to carry structures such as magnetic steel and the first oil groove. The magnetic steel through hole is used to install the magnetic steel, which is an important component for generating the motor magnetic field and plays a key role in the performance and efficiency of the motor. Multiple magnetic steel through holes are arranged at intervals along the circumferential direction to ensure the uniform distribution of the magnetic field and improve the running stability of the motor. By arranging the first oil groove in the plane area, the anti-rust grease can be intercepted to prevent the anti-rust grease from splashing into the motor cavity and affecting the normal operation of the brake and other sensitive components. The first oil groove maintains a preset interval with the outer peripheral edge of the body to prevent the first oil groove from being connected to the motor cavity, and to prevent the anti-rust grease intercepted in the first oil groove from entering the motor cavity from the first oil groove under the action of the centrifugal force generated by the rotation of the rotor. The rotor provided by the present invention, by arranging the first oil groove, the anti-rust grease encounters more obstacles when flowing toward the motor cavity under the action of high temperature and centrifugal force, so that it is effectively intercepted in the first oil groove, reducing the situation of the anti-rust grease volatilizing and splashing on other components in the motor cavity, thereby improving the stability and safety of the motor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 A front view of a rotor punching according to an embodiment of the present invention is shown;

[0028] Figure 2 A schematic diagram showing the overall structure of a rotor punching sheet according to an embodiment of the present invention is shown;

[0029] Figure 3 A partial structural schematic diagram of a rotor punching sheet according to an embodiment of the present invention is shown;

[0030] Figure 4 A front view of a punching end plate of a rotor assembly according to an embodiment of the present invention is shown;

[0031] Figure 5 A schematic diagram showing the overall structure of a rotor core according to an embodiment of the present invention is shown;

[0032] Figure 6 A front view of a rotating shaft of a rotor assembly according to an embodiment of the present invention is shown;

[0033] Figure 7 A cross-sectional view of a rotating shaft of a rotor assembly of an embodiment of the present invention is shown;

[0034] Figure 8 A cross-sectional view of a rotor assembly showing an embodiment of the present invention;

[0035] Fig. 9 A schematic diagram showing the overall structure of the rotor core and the rotating shaft of an embodiment of the present invention; and

[0036] Fig.10 A cross-sectional view of a motor showing an embodiment of the present invention is shown.

[0037] The above drawings include the following reference numerals:

[0038] 1. Rotating shaft; 11. First oil channel; 2. Main body; 21. First oil groove; 22. Second oil groove; 3. Magnetic steel through hole; 4. Positioning part; 41. First positioning part; 42. Second positioning part; 5. Rotor core; 6. Second oil channel; 7. Third oil channel; 8. Punching end plate; 9. Shaft hole. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] See also Figures 1 to 10 As shown, the present invention provides a rotor, which includes a main body 2 and a plurality of magnetic steel through holes 3, wherein the plurality of magnetic steel through holes 3 are circumferentially spaced apart on the main body 2, and a plurality of planar areas are formed between adjacent magnetic steel through holes 3, wherein a first oil groove 21 is provided on at least part of the planar areas, and the first oil groove 21 has a preset interval with the outer periphery of the main body 2.

[0041] In the above technical solution, the main body 2 is mainly used to carry structures such as the magnetic steel and the first oil groove 21. The magnetic steel through hole 3 is used to install the magnetic steel, which is an important component for generating the magnetic field of the motor and plays a key role in the performance and efficiency of the motor. Multiple magnetic steel through holes 3 are arranged at intervals along the circumference to ensure the uniform distribution of the magnetic field and improve the operating stability of the motor. By arranging the first oil groove 21 in the plane area, anti-rust grease can be intercepted to prevent the anti-rust grease from splashing into the motor cavity and affecting the normal operation of the brake and other sensitive components. The first oil groove 21 maintains a preset interval with the outer periphery of the main body to prevent the first oil groove 21 from being connected to the motor cavity, and to prevent the anti-rust grease intercepted in the first oil groove 21 from entering the motor cavity from the first oil groove 21 under the action of the centrifugal force generated by the rotation of the rotor. The rotor provided by the present invention, by providing the first oil groove 21, makes the anti-rust grease encounter more obstacles when flowing toward the motor cavity under the action of high temperature and centrifugal force, so that the anti-rust grease is effectively trapped in the first oil groove 21, thereby reducing the volatilization of the anti-rust grease and the splashing of the anti-rust grease onto other components in the motor cavity, thereby improving the stability and safety of the motor operation.

[0042] In one embodiment of the present invention, first oil grooves 21 are provided on both sides of the body 2 .

[0043] In the above technical solution, the first oil groove 21 is provided on both sides of the main body 2, so that the anti-rust grease flowing on any side of the main body 2 can be effectively intercepted by the first oil groove 21, further improving the interception efficiency and effect of the first oil groove 21, thereby ensuring that the anti-rust grease can fully act on the rotor and significantly extend the service life of the motor.

[0044] In one embodiment of the present invention, the first oil groove 21 is disposed on the first surface or the second surface of the body 2 .

[0045] In the above technical solution, the first oil groove 21 is set on a single side of the main body 2 to achieve the retention of anti-rust grease. Compared with the solution of setting the first oil groove 21 on both sides of the main body 2, setting the first oil groove 21 on a single side can reduce the processing steps of the rotor punching, reduce the processing difficulty, and thus reduce the processing cost.

[0046] In one embodiment of the present invention, a plurality of first oil grooves 21 are disposed on the body 2 , and the plurality of first oil grooves 21 are radially spaced apart in a plane region formed between adjacent magnetic steel through holes 3 .

[0047] In the above technical solution, since the anti-rust grease flows radially outward under the action of centrifugal force when the battery cell rotates, the anti-rust grease can be intercepted multiple times by arranging multiple first oil grooves 21 at intervals along the radial direction, which significantly improves the interception effect of the anti-rust grease and greatly reduces the amount of volatilization and leakage of the anti-rust grease.

[0048] In one embodiment of the present invention, the body 2 is further provided with a second oil groove 22 and an axial hole 9, and the second oil groove 22 extends radially inwardly along the body 2 and connects the first oil groove 21 and the axial hole 9. In the above technical scheme, the body 2 realizes the connection between the rotor and the rotating shaft 1 through the interference fit between the rotating shaft 1 and the axial hole 9, and the second oil groove 22 is used to connect the first oil groove 21 and the axial hole 9. When the motor is running, the anti-rust grease is blocked and retained in the first oil groove 21, and the grease in the first oil groove 21 can flow to the axial hole 9 through the second oil groove 22, and the internal circulation and uniform distribution of the anti-rust grease are realized through the connecting oil channel on the inner wall of the rotating shaft 1 or the body 2. In one embodiment of the present invention, a first oil groove 21 is provided between any two adjacent magnetic steel through holes 3.

[0049] In the above technical solution, the planar area between the magnetic steel through holes 3 is the main application area of ​​the anti-rust grease. When the click is running, the anti-rust grease will flow outward along the surface of the planar area under the action of high temperature and centrifugal force. By setting a first oil groove 21 between any two adjacent magnetic steel through holes 3, the grease can be intercepted on the main flow path of the anti-rust grease, thereby significantly reducing the amount of anti-rust grease volatilizing and leaking into the motor cavity, thereby improving the stability and safety of the motor operation.

[0050] In one embodiment of the present invention, the first oil groove 21 is arc-shaped and extends in the circumferential direction.

[0051] In the above technical solution, since the anti-rust grease flows radially outward under the action of centrifugal force when the battery core rotates, the arc-shaped first oil groove 21 can make each part of the first oil groove 21 perpendicular to the flow direction of the anti-rust grease, thereby causing the greatest resistance to the flow of the anti-rust grease and improving the interception effect of the first oil groove 21 on the anti-rust grease. The first oil groove 21 extends in the circumferential direction, so that the first oil groove 21 can cover the route that the anti-rust grease may pass through as much as possible, reducing the amount of volatilization and leakage of the anti-rust grease from the plane area.

[0052] In one embodiment of the present invention, the first oil groove 21 is in a straight line shape or a broken line shape.

[0053] In the above technical solution, the first oil groove 21 can be set to different shapes according to the usage scenarios and the types of anti-rust grease to achieve the best interception effect. The straight first oil groove 21 is easier to process and can reduce the process difficulty and cost. The zigzag first oil groove 21 can significantly increase the flow path length of the grease in the oil groove, thereby having a better interception effect.

[0054] In one embodiment of the present invention, assuming that the number of rotor poles is p, the angular range of the first oil groove 21 is [180° / p, 360° / p).

[0055] In the above technical solution, since the first oil groove 21 is arranged between any two adjacent magnetic steel through holes 3, and the position and number of the magnetic steel through holes 3 directly determine the magnetic field distribution and the number of poles of the motor, the angular range of the first oil groove 21 is related to the number of rotor poles. When the number of rotor poles is p, the angular range of the first oil groove 21 is [180° / p, 360° / p), thereby ensuring that the first oil groove 21 can cover the flow path of the anti-rust grease, thereby having the effect of blocking and retaining the anti-rust grease.

[0056] In one embodiment of the present invention, a plurality of first oil grooves 21 are arranged at intervals in the radial direction, and the second oil groove 22 connects the plurality of first oil grooves 21 with the shaft hole 9 .

[0057] In the above technical solution, since the anti-rust grease flows radially outward under the action of centrifugal force when the battery core rotates, the anti-rust grease can be intercepted multiple times by arranging multiple first oil grooves 21 at intervals along the radial direction, which significantly improves the interception effect of the anti-rust grease and greatly reduces the amount of volatilization and leakage of the anti-rust grease. By arranging the second oil groove 22 to connect the multiple first oil grooves 21 with the shaft hole 9, the anti-rust grease intercepted by the first oil groove 21 can be collected through the second oil groove 22 and transported to the oil channel in the direction of the shaft hole 9.

[0058] In one embodiment of the present invention, the width of the second oil groove 22 gradually increases from inside to outside along the radial direction of the body 2 .

[0059] In the above technical solution, the wider second oil groove 22 provides a larger accommodation space on the outside, which helps to improve the convergence efficiency of the anti-rust grease in the outer first oil groove 21.

[0060] In one embodiment of the present invention, the circumferential lengths of the plurality of first oil grooves 21 gradually increase from inside to outside along the radial direction of the body 2 .

[0061] In the above technical solution, as the radius of the rotor punching increases, the width of the planar area between two adjacent magnetic steel through holes 3 also gradually increases. Therefore, the circumferential length of the multiple first oil grooves 21 is set to gradually increase from the inside to the outside along the radial direction of the main body 2, so that the first oil grooves 21 can cover the routes that the anti-rust grease may pass through as much as possible, thereby reducing the amount of anti-rust grease volatilizing and leaking from the planar area.

[0062] In one embodiment of the present invention, the widths of the plurality of first oil grooves 21 are equal.

[0063] In the above technical solution, the equal widths of the multiple first oil grooves 21 help promote the uniform distribution of the anti-rust grease on the rotor core. During the operation of the motor, the anti-rust grease will not flow deviated due to the change in the width of the first oil grooves 21 when flowing in these first oil grooves 21, thereby ensuring that the anti-rust grease can be evenly distributed between the first oil grooves 21, thereby improving the anti-rust effect.

[0064] In one embodiment of the present invention, the widths of the plurality of first oil grooves 21 gradually increase or decrease from inside to outside along the radial direction of the body 2 .

[0065] In the above technical solution, the anti-rust grease flows radially outward under the action of centrifugal force. The closer the anti-rust grease is to the edge of the main body 2, the greater the centrifugal force it is subjected to, and the faster the grease flows. By setting the width of the second oil groove 22 to gradually increase from the inside to the outside, it is ensured that the anti-rust grease close to the edge of the main body 2 can be effectively retained, thereby improving the retention effect.

[0066] In one embodiment of the present invention, the main body 2 is further provided with a positioning portion 4, and a plurality of positioning portions 4 are arranged at intervals along the circumferential direction.

[0067] In the above technical solution, the positioning parts 4 on the multiple rotor core punching sheets are all arranged at the same position. After the multiple rotor core punching sheets are assembled and fixed by the positioning parts 4 to form the rotor core, the oil grooves between the layers and the magnetic steel through holes 3 can be accurately aligned to avoid misalignment or non-concentricity. The multiple positioning parts 4 are arranged at intervals along the circumferential direction, which further improves the positioning accuracy on the one hand, and improves the fixing strength and reliability of the multiple core punching sheets being crimped and fixed by the positioning parts 4 on the other hand.

[0068] In one embodiment of the present invention, the positioning portion 4 includes a first positioning portion 41 and a second positioning portion 42 . The first positioning portion 41 is a protrusion provided on the first surface of the body 2 , and the second positioning portion 42 is a depression provided on the second surface of the body 2 at a position corresponding to the first positioning portion 41 .

[0069] In the above technical solution, the first positioning portion 41 and the second positioning portion 42 are respectively arranged on the two sides of the rotor core punching sheet. When multiple layers of punching sheets are stacked and crimped together, the combination of protrusions and recesses ensures precise alignment between the layers of punching sheets, and the maze structure and oil groove inside the rotor core can be accurately connected.

[0070] In one embodiment of the present invention, the first positioning portion 41 is a columnar protrusion or a spherical protrusion, and the second positioning portion 42 is a columnar depression or a spherical depression matching the first positioning portion 41 .

[0071] In the above technical solution, the positioning portion 4 can be set to a variety of shapes to adapt to changes in processing conditions or the requirements of actual working conditions for the connection strength of the positioning portion 4. As long as the shapes of the first positioning portion 41 and the second positioning portion 42 can match, the rotor punching positioning and crimping assembly fixation effect can be achieved.

[0072] See also Figures 1 to 10As shown, the present invention provides a rotor core, including multiple stacked rotor punchings, the rotor punchings are the above-mentioned rotor punchings, when the multiple rotor punchings include a first positioning portion 41 and a second positioning portion 42, the first positioning portions 41 on multiple bodies 2 are crimped and fixed with the second positioning portions 42 on adjacent bodies 2.

[0073] In the above technical solution, the protrusions of the first positioning portions 41 on the multiple bodies 2 are crimped into the depressions of the second positioning portions 42 on the adjacent bodies 2, thereby crimping and fixing the multiple rotor punchings to form a rotor core. During the assembly process, if the punchings are not aligned, the interception function and fluidity of the labyrinth oil channel structure composed of the first oil groove 21 and the second oil groove 22 will be affected, thereby reducing the management efficiency of the anti-rust grease. The design of the positioning portion 4 avoids these problems. By setting the positioning portion 4 to locate the assembly position between each layer of rotor punchings, it is ensured that the hole positions and slot positions between the rotor punchings are accurately aligned, thereby improving the interception and uniform distribution of the anti-rust grease.

[0074] See also Figures 1 to 10 As shown, the present invention provides a rotor assembly, including a rotor core 5 and a rotating shaft 1. The rotor core 5 is sleeved on the rotating shaft 1, and the rotor core 5 is the above-mentioned rotor core.

[0075] In the above technical solution, the interaction between the permanent magnets installed on the rotor core 5 and the stator magnetic field generates attractive and repulsive forces. When the stator magnetic field rotates, these forces cause the permanent magnets on the rotor core 5 to rotate with the magnetic field, thereby generating a rotational motion. The rotating shaft 1 is used to support the rotor core 5 and transmit the rotational motion generated by the rotor core 5 to the drive end of the motor. The rotor core 5 and the rotating shaft 1 are fixed by interference fit between the rotor core 5 and the rotating shaft 1, thereby forming a rotor assembly.

[0076] In one embodiment of the present invention, when the rotor core 5 includes the second oil grooves 22 , a first oil passage 11 is provided on the side wall of the shaft hole 9 of the rotor core 5 . The first oil passage 11 extends axially and connects the plurality of second oil grooves 22 .

[0077] In the above technical solution, the first oil passage 11 is connected to multiple second oil grooves 22 along the axial direction to form a flow distribution path for the anti-rust grease. When the motor is running, the anti-rust grease inside the rotor core 5 tries to diffuse due to the high temperature and centrifugal force, and the first oil groove 21 on the rotor punching intercepts the anti-rust grease, so that the anti-rust grease remains in the first oil groove 21. Through the second oil groove 22 connected to multiple first oil grooves 21, the grease is guided to the first oil passage 11 for redistribution. Even if the amount of anti-rust grease on some rotor punchings is reduced due to volatilization or leakage, it can be supplemented through the first oil passage 11, thereby ensuring that the grease is evenly distributed inside the rotor core 5, avoiding local drying or grease accumulation, and thus extending the service life of the motor.

[0078] In one embodiment of the present invention, when the rotor core 5 includes a first oil groove 21 and a second oil groove 22, multiple first oil grooves 21 located under the same pole form a second oil channel 6, and multiple second oil grooves 22 located under the same pole form a third oil channel 7. A first oil channel 11 is provided on the rotating shaft 1, and the third oil channel 7 connects the first oil channel 11 and the second oil channel 6.

[0079] In the above technical solution, the first oil passage 11 is arranged on the rotating shaft 1, and the first oil passage 11 is connected to a plurality of second oil grooves 22 in the axial direction to form a flow distribution path of the anti-rust grease. When the motor is running, the anti-rust grease inside the rotor core 5 tries to diffuse due to the high temperature and centrifugal force, and the plurality of first oil grooves 21 form the second oil passage 6, which intercepts the anti-rust grease and keeps it in the second oil passage 6. Through the third oil passage 7 connecting the first oil passage 11 and the second oil passage 6, the grease is guided to the first oil passage 11 for redistribution, and even if the amount of anti-rust grease on some rotor punchings is reduced due to volatilization or leakage, it can be supplemented through the first oil passage 11, thereby ensuring that the grease is evenly distributed inside the rotor core 5, avoiding local drying or grease accumulation, and thus extending the service life of the motor.

[0080] In one embodiment of the present invention, there are multiple first oil passages 11 and multiple third oil passages 7. The multiple first oil passages 11 are arranged at circumferential intervals along the rotating shaft 1, and the multiple third oil passages 7 are arranged at circumferential intervals along the rotor core. The first oil passages 11 and the third oil passages 7 located at the same circumferential position are correspondingly connected.

[0081] In the above technical solution, second oil channels 6 are arranged in multiple directions along the circumference of the rotor core to intercept anti-rust grease from all directions, and third oil channels 7 are arranged in each direction to connect the second oil channels 6 in that direction to collect the grease in the second oil channels 6. Therefore, multiple third oil channels 7 are arranged at intervals along the circumference of the rotor core, and the first oil channel 11 located at the same circumferential position is correspondingly connected to the third oil channel 7, so that the anti-rust grease in each direction can circulate in the oil channel in the corresponding direction to achieve a uniform distribution effect.

[0082] In one embodiment of the present invention, two punching end plates 8 are crimped and fixed on the end surface of the rotor core 5, and the punching end plates 8 close the first oil channel 11, the second oil channel 6 and the third oil channel 7 from the end surface, and the corresponding connected first oil channel 11, the second oil channel 6 and the third oil channel 7 form a closed circulating oil chamber.

[0083] In the above technical solution, the oil grooves are not arranged on the punching end plate 8 at positions corresponding to the first oil grooves and the second oil grooves, so that the oil passages can be closed after the two punching end plates 8 are crimped and fixed to the end faces of the rotor core 5, so that the rust-proof grease can circulate in the closed oil chamber formed by the first oil passage 11, the second oil passage 6 and the third oil passage 7, thereby preventing the grease from leaking from the end of the rotor core 5.

[0084] In one embodiment of the present invention, the rotor assembly further includes a punching end plate 8 . When the rotor core 5 includes the magnetic steel through hole 3 and the positioning portion 4 , the punching end plate 8 includes the magnetic steel through hole 3 and the positioning portion 4 .

[0085] In the above technical solution, the punching end plate 8 is provided with a magnetic steel through hole 3 and a positioning portion 4 corresponding to the rotor punching, so that the punching end plate 8 can be crimped and fixed to the punchings at both ends of the rotor core 5 through the positioning portion 4, and at the same time will not cause any obstruction to the normal installation of the magnetic steel through hole 3.

[0086] See also Figures 1 to 10 As shown, the present invention provides a motor, including a rotor assembly, and the rotor assembly is the rotor assembly mentioned above.

[0087] In the above technical solution, the motor adopts a rotor assembly with a first oil channel 11, a second oil channel 6 and a third oil channel 7 on the iron core to prevent the anti-rust grease from volatilizing from the rotor assembly and splashing onto other components in the motor cavity, thereby improving the stability and safety of the motor operation and extending the service life of the motor.

[0088] In one embodiment of the present invention, the width of the first oil passage 11 is greater than the width of the third oil passage 7 , and the ratio of the width of the first oil passage 11 to the width of the third oil passage 7 is 1:1.3 to 1:1.1.

[0089] In the above technical solution, since the anti-rust grease in multiple second oil channels 6 is collected in the first oil channel 11 via the third oil channel 7 for storage and distribution, the width of the first oil channel 11 is designed to be larger than the width of the third oil channel 7, thereby ensuring that a large amount of anti-rust grease can flow smoothly in the first oil channel 11, improving the efficiency and uniformity of grease flow distribution, thereby slowing down the rusting speed of the rotor punchings and extending the service life of the motor.

[0090] In one embodiment of the present invention, the ratio of the depth of the first oil channel 11 to the radius of the rotating shaft is 1:20 to 1:10.

[0091] In the above technical solution, the first oil passage 11 needs to store and distribute the anti-rust grease collected in the plurality of second oil passages 6, so the first oil passage 11 needs to have a certain depth to accommodate enough anti-rust grease, and ensure that the anti-rust grease can flow smoothly in the first oil passage 11. When the first oil passage 11 is set on the rotating shaft 1, the first oil passage 11 should not be too deep, otherwise it will have an adverse effect on the structural strength of the rotating shaft 1, so the ratio of the depth of the first oil passage 11 to the rotating shaft radius is limited to 1:20 to 1:10, which can ensure the normal operation of the first oil passage 11 without causing too much impact on the structure of the rotating shaft 1.

[0092] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: the main body 2 is mainly used to carry structures such as magnetic steel and the first oil groove 21. The magnetic steel through hole 3 is used to install the magnetic steel, which is an important component for generating the motor magnetic field and plays a key role in the performance and efficiency of the motor. Multiple magnetic steel through holes 3 are arranged at intervals along the circumferential direction to ensure the uniform distribution of the magnetic field and improve the operating stability of the motor. By arranging the first oil groove 21 in the plane area, anti-rust grease can be intercepted to prevent the anti-rust grease from splashing into the motor cavity and affecting the normal operation of the brake and other sensitive components. The first oil groove 21 maintains a preset interval with the outer periphery of the main body to prevent the first oil groove 21 from communicating with the motor cavity, and to prevent the anti-rust grease intercepted in the first oil groove 21 from entering the motor cavity from the first oil groove 21 under the action of the centrifugal force generated by the rotation of the rotor. The rotor provided by the present invention is provided with a first oil groove 21 so that the anti-rust grease encounters more obstacles when flowing toward the motor cavity under the action of high temperature and centrifugal force, so that it is effectively trapped in the first oil groove 21, reducing the volatilization of the anti-rust grease and splashing on other components in the motor cavity, thereby improving the stability and safety of the motor operation. The rotor core provided by the present invention includes a plurality of stacked rotor punchings, and the rotor punchings are the above-mentioned rotor punchings. When the plurality of rotor punchings include a first positioning portion 41 and a second positioning portion 42, the first positioning portions 41 on the plurality of bodies 2 are crimped and fixed with the second positioning portions 42 on the adjacent bodies 2. In the rotor assembly provided by the present invention, the interaction between the permanent magnets installed on the rotor core 5 and the stator magnetic field generates attractive and repulsive forces. When the stator magnetic field rotates, these forces cause the permanent magnets on the rotor core 5 to rotate with the magnetic field, thereby generating a rotational motion. The rotating shaft 1 is used to support the rotor core 5 and transmit the rotational motion generated by the rotor core 5 to the drive end of the motor. The rotor core 5 and the rotating shaft 1 are fixed by interference fit between the rotor core 5 and the rotating shaft 1, thereby forming a rotor assembly. The motor provided by the present invention adopts a rotor assembly provided with a first oil passage 11, a second oil passage 6 and a third oil passage 7 on the iron core, thereby preventing the anti-rust grease from volatilizing from the rotor assembly and splashing onto other components in the motor cavity, thereby improving the stability and safety of the motor operation and extending the service life of the motor.

[0093] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0094] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor punching, characterized in that: The invention comprises a main body (2) and a plurality of magnetic steel through holes (3), wherein the plurality of magnetic steel through holes (3) are arranged on the main body (2) at intervals along the circumferential direction, a plurality of plane areas are formed between adjacent magnetic steel through holes (3), a first oil groove (21) is provided on at least part of the plane areas, and the first oil groove (21) has a preset interval with the outer periphery of the main body (2).

2. The rotor punching according to claim 1, characterized in that: The body (2) is also provided with a second oil groove (22) and an axial hole (9); the second oil groove (22) extends radially inwardly along the body (2) and communicates with the first oil groove (21) and the axial hole (9).

3. The rotor punching according to claim 1, characterized in that: The first oil groove (21) is provided between any two adjacent magnetic steel through holes (3).

4. The rotor punching according to claim 1, characterized in that: The first oil groove (21) is arc-shaped and extends in the circumferential direction; and / or, assuming that the number of rotor poles is p, the angle range of the first oil groove (21) is [180° / p, 360° / p).

5. The rotor punching according to claim 2, characterized in that: The plurality of first oil grooves (21) are arranged at intervals along the radial direction, and the second oil groove (22) connects the plurality of first oil grooves (21) with the shaft hole (9); and / or the width of the second oil groove (22) gradually increases from the inside to the outside along the radial direction of the body (2).

6. The rotor punching according to claim 1, characterized in that: The circumferential lengths of the plurality of first oil grooves (21) gradually increase from inside to outside along the radial direction of the body (2).

7. The rotor punching according to claim 1, characterized in that: The widths of the plurality of first oil grooves (21) are equal; or the widths of the plurality of first oil grooves (21) gradually increase or decrease from inside to outside along the radial direction of the body (2).

8. The rotor punching according to claim 1, characterized in that: The body (2) is also provided with a positioning portion (4), and a plurality of the positioning portions (4) are arranged at intervals along the circumferential direction.

9. The rotor punching according to claim 8, characterized in that: The positioning portion (4) comprises a first positioning portion (41) and a second positioning portion (42); the first positioning portion (41) is a protrusion arranged on the first surface of the body (2); and the second positioning portion (42) is a depression arranged at a position on the second surface of the body (2) corresponding to the first positioning portion (41).

10. A rotor core, characterized in that: It comprises a plurality of stacked rotor punchings, wherein the rotor punchings are the rotor punchings described in any one of claims 1 to 9, and when the plurality of rotor punchings comprise a first positioning portion (41) and a second positioning portion (42), the first positioning portions (41) on the plurality of bodies (2) are crimped and fixed with the second positioning portions (42) on adjacent bodies (2).

11. A rotor assembly, characterized in that: The invention comprises a rotor core (5) and a rotating shaft (1), wherein the rotor core (5) is sleeved on the rotating shaft (1), and the rotor core (5) is the rotor core described in claim 10.

12. The rotor assembly according to claim 11, characterized in that When the rotor core (5) includes a second oil groove (22), a first oil passage (11) is provided on the side wall of the axial hole (9) of the rotor core (5), and the first oil passage (11) extends in the axial direction and is connected to a plurality of the second oil grooves (22).

13. The rotor assembly according to claim 11, characterized in that When the rotor core (5) includes a first oil groove (21) and a second oil groove (22), a plurality of the first oil grooves (21) located under the same pole form a second oil passage (6), and a plurality of the second oil grooves (22) located under the same pole form a third oil passage (7). A first oil passage (11) is provided on the rotating shaft (1), and the third oil passage (7) connects the first oil passage (11) and the second oil passage (6).

14. The rotor assembly according to claim 13, characterized in that The first oil passage (11) and the third oil passage (7) are both multiple, and the multiple first oil passages (11) are arranged at intervals along the circumference of the rotating shaft (1), and the multiple third oil passages (7) are arranged at intervals along the circumference of the rotor core, and the first oil passage (11) and the third oil passage (7) located at the same circumferential position are correspondingly connected.

15. The rotor assembly according to claim 14, characterized in that Two punching end plates (8) are crimped and fixed to the end surface of the rotor core (5), and the punching end plates (8) close the first oil passage (11), the second oil passage (6) and the third oil passage (7) from the end surface, so that the correspondingly connected first oil passage (11), the second oil passage (6) and the third oil passage (7) form a closed circulating oil chamber.

16. The rotor assembly according to claim 11, characterized in that The rotor assembly further comprises a punching end plate (8). When the rotor core (5) comprises a magnetic steel through hole (3) and a positioning portion (4), the punching end plate (8) comprises the magnetic steel through hole (3) and the positioning portion (4).

17. A motor, characterized in that: It comprises a rotor assembly, wherein the rotor assembly is the rotor assembly as claimed in claim 11.

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