A method for manufacturing a segmented skew-pole permanent magnet motor rotor and its structure

Abstract

This invention relates to the field of electric motors and discloses a method for manufacturing a segmented skew-pole permanent magnet motor rotor, comprising the following steps: S1, manufacturing lamination units: The lamination units are provided with magnet assembly slots matching the magnet arrangement, shaft holes, and two layers of staggered riveting holes (inner and outer layers) to replace the positioning slots of the positioning fixtures. S2, assembling the lamination units: The lamination units are stacked using a specific stacking method and fixed together with rivets. This invention also discloses a segmented skew-pole permanent magnet motor rotor structure manufactured using the above method. This invention uses lamination units with pre-set riveting holes and slots, allowing for direct riveting after the lamination units are stacked using a specific method. This not only ensures the accuracy of the deflection angle of each segment and the simplicity of the process but also improves the yield and production efficiency.

Description

Technical Field

[0001] The invention relates to the field of motors, and in particular to a method for manufacturing a segmented skew-pole permanent magnet motor rotor and a structure thereof. Background Art

[0002] In a permanent magnet motor, the interaction between the permanent magnet and the armature core teeth will generate a cogging torque. If no suppression measures are taken, torque pulsation will be generated, causing vibration and noise and affecting the control accuracy of the system. For inner rotor permanent magnet motors, in order to reduce the cogging torque and improve the control performance, the stator skew slot method or the rotor skew pole method is often used. However, the stator skew slot method has the disadvantage of being difficult to achieve automated wire embedding. In mass-produced permanent magnet motors, the rotor skew pole solution is often used: that is, a combination of stator straight slots and rotor skew poles. Among them, the rotor segmented skew pole method not only has better tooth harmonics and weakening effects on cogging torque, but also uses a regular geometric magnetic steel. It has the characteristics of low production cost and good processability and is widely used.

[0003] The conventional permanent magnet rotor segmented skew pole process requires the use of special tooling to position the deflection angle of each segment during riveting, and the riveting holes need to be opened later or riveted after the waist-shaped holes are preset. The process is relatively cumbersome and the yield rate is low. If the lamination welding process is used, the eddy current loss will increase, resulting in a decrease in motor efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a segmented skewed pole permanent magnet motor rotor structure and manufacturing method, which can adapt to the rotor segmented skewed pole riveting process, reduce the permanent magnet motor cogging torque, and improve the control accuracy. The structure is simple, and during production and assembly, no special tooling is required for angle positioning. The production process is simplified by aligning the position of the sheet slot instead of angle positioning.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention discloses a method for manufacturing a segmented skew-pole permanent magnet motor rotor, which is characterized by comprising the following steps:

[0007] Production and punching unit:

[0008] S1. Several magnetic steel assembly grooves matching the magnetic steel arrangement are dug at equal intervals on the punch body, and a shaft hole is opened in the middle.

[0009] S2. Make an outer arrangement circle and an inner arrangement circle between the magnetic steel assembly groove and the shaft hole; make a symmetry line OC of two adjacent magnetic steel assembly grooves through the center point O of the shaft, make a straight line with an angle of α with the line segment OC through the center point O of the shaft, intersect with the outer arrangement circle at point A, and extend OA in the opposite direction to intersect with the inner arrangement circle at point A'; make a straight line with an angle of β with the line segment OA through the center point O of the shaft, intersect with the inner arrangement circle at point B, and extend OB in the opposite direction to intersect with the outer arrangement circle at point B', and make a circular array of A, B, A', and B' around point O with the number of items P = the number of rotor pole pairs p, and the obtained points are the center point positions of each inner riveting hole and outer riveting hole, and the inner riveting holes and outer riveting holes are opened according to the center point positions; the angle β is equal to the skew pole angle when the rotor of the segmented skew pole permanent magnet motor is segmented into four segments, and β = 2α.

[0010] S3. Two sheet sorting slots are set on the rotating shaft hole, namely a first sheet sorting slot and a second sheet sorting slot; the center line of the first sheet sorting slot is located on the side close to point A on the straight line AA', and the center line of the second sheet sorting slot is located on the side close to point B' on the straight line BB'.

[0011] Assembling the punching unit:

[0012] S4. Place the magnetic steel in the magnetic steel assembly groove, and then overlap several sections of the punching sheet units according to the preset oblique polar angle, and then fix them into one by rivets that pass through the inner rivet holes and the outer rivet holes that are connected to the several sections of the punching sheet units in sequence to make a permanent magnet motor rotor.

[0013] Furthermore, the angle of the preset segment oblique polar angle θ can be calculated using the following formula:

[0014]

[0015] Among them, θ is the preset segmented skew angle; Z is the number of stator slots; 2p is the number of rotor poles; N is the number of rotor segments; LCM (Z, 2p) represents the least common multiple of the number of stator slots Z and the number of rotor poles 2p.

[0016] Furthermore, the distance between the edge of the outer layer riveting hole and the edge of the inner layer riveting hole is greater than or equal to 1 mm.

[0017] Furthermore, in step S4, the punching unit is provided with two sections, namely a first punching unit and a second punching unit; when overlapping, the taken out second punching unit is flipped over, placed under the first punching unit, and rotated until the second sheet sorting groove of the second punching unit is aligned with the center line of the first sheet sorting groove of the first punching unit; rivets pass through a number of inner rivet holes and outer rivet holes to fix them together.

[0018] Furthermore, during riveting, the rivets are inserted through half the number of the inner layer riveting holes and the outer layer riveting holes, staggered and fixed as a whole.

[0019] Further, in step S4, the punching unit is provided with four sections, namely the first punching unit, the second punching unit, the third punching unit and the fourth punching unit; from top to bottom, the fourth punching unit, the first punching unit, the third punching unit and the second punching unit are stacked in sequence.

[0020] First, take out the third punching unit and turn it over, place it under the first punching unit, and rotate it until the center line of the first sheet sorting slot of the third punching unit is aligned with the center line of the first sheet sorting slot of the first punching unit.

[0021] The second punching unit is taken out and turned over, and placed below the third punching unit, and rotated until the center line of the second sheet sorting slot of the second punching unit is aligned with the center line of the first sheet sorting slot of the first punching unit.

[0022] Take out the fourth punching unit, place it above the first punching unit, and rotate it until the center line of the second sheet sorting slot of the fourth punching unit is aligned with the center line of the first sheet sorting slot of the first punching unit.

[0023] The rivets pass through the riveting holes connected in the four-section punching unit in sequence and fix them into one piece.

[0024] Furthermore, when stacked, a magnetic isolation layer is placed between two adjacent sections of the punching sheet units, and the magnetic isolation layer is provided with connecting holes connected to the inner layer riveting holes and the outer layer riveting holes.

[0025] Furthermore, the magnetic isolation layer is made of non-ferromagnetic material.

[0026] Furthermore, the magnetic isolation layer has a thickness of 1-3 mm.

[0027] The present invention also discloses a segmented oblique pole permanent magnet motor rotor structure, which is manufactured by the segmented oblique pole permanent magnet motor rotor manufacturing method described above, wherein the number of pole pairs of the punching sheet body is p, and the rivet holes include 2p outer layer rivet holes and 2p inner layer rivet holes arranged circumferentially; the center point of each outer layer rivet hole is set to be A along the circumferential direction. n (n=1,2,3,...,2p), the center point of each inner riveting hole along the circumferential direction is recorded as B n (n=1,2,3,...,2p).

[0028] Among them A n Point and B n+1 The angles formed by the line connecting the points (n=1, 2, 3, ..., 2p-1) and the center of the shaft O and A 2p The degree of the angle formed by the lines connecting point A and point B1 with the center of the rotation axis O is 180° / p.

[0029] A nPoint and B n The angle between the line connecting the points (n=1, 2, 3, ..., 2p) and the center O of the rotation axis is β;

[0030] The angle between the line A1O connecting point A1 and the center O of the rotating shaft and the symmetry line OC of two adjacent magnetic steel assembly grooves is α.

[0031] The angle β is equal to the skew angle of the segmented skew pole permanent magnet motor rotor when the segmented skew pole permanent magnet motor rotor is segmented into four segments, and β=2α.

[0032] There are two wafer sorting grooves, namely a first wafer sorting groove and a second wafer sorting groove. The center line of the first wafer sorting groove is located on the straight line A1O close to the point A1 side, and the center line of the second wafer sorting groove is located on the straight line B1O close to the point O extension line side.

[0033] The benefits of the present invention are:

[0034] 1. The rotor punching unit of the present invention adopts an inner and outer two-layer staggered riveting hole design, and reasonably presets the segmented oblique pole angle, the sheet arrangement slot and the riveting hole position for positioning. The punching processing accuracy is used to ensure the assembly positioning accuracy of the segmented oblique pole, without the need for additional angle positioning tooling. The assembly process is simplified and production costs are reduced. After the punching units are stacked in a specified manner, they can be directly riveted to form a segmented oblique pole permanent magnet motor rotor structure. Not only can the deflection angle accuracy of each section be guaranteed, but the process is simple and the yield is high. Since only one punching unit is used for assembly, one mold can be used for production, which greatly improves production efficiency and reduces production costs.

[0035] 2. The punching unit of the present invention can actually be used for the same hole position of the lamination riveting as the number of rotor poles 2p, ensuring the stable and reliable quality of the lamination. At the same time, the lamination slot can also be used as a key slot during assembly to increase the reliability of the rotor.

[0036] 3. The punching unit of the present invention adopts a staggered design of inner and outer riveting holes, which can be applied to rotors with 2 and 4 segments at the same time, thereby improving adaptability.

[0037] 4. The segmented oblique pole permanent magnet motor rotor structure of the present invention is provided with a magnetic isolation layer between two adjacent segments of the punching unit, which can be used to reduce the magnetic leakage of the magnetic steel of the two adjacent segments and improve the efficiency of the permanent magnet motor. The magnetic isolation layer is provided with connecting holes that match the inner layer riveting holes and the outer layer riveting holes, which can ensure assembly accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the punching unit.

[0039] Figure 2 It is a schematic diagram of the structure in which the punching unit in the motor rotor is divided into two sections.

[0040] Figure 3 It is a schematic diagram of the structure in which the punching unit in the motor rotor is divided into four sections.

[0041] Figure 4 It is a schematic diagram of the structure of the magnetic isolation layer.

[0042] Figure 5 It is a schematic diagram of a three-dimensional structure in which the punching unit in the motor rotor is divided into two sections.

[0043] Figure 6 It is a schematic diagram of the decomposed structure of the punching unit in the motor rotor into two sections.

[0044] Figure 7 It is a schematic diagram of the three-dimensional structure in which the punching unit in the motor rotor is divided into four sections.

[0045] Figure 8 It is a schematic diagram of the decomposed structure of the punching unit in the motor rotor being divided into four sections.

[0046] Main component symbols:

[0047] 1. Outer layer riveting hole, 2. Inner layer riveting hole, 3. First sheet sorting slot, 4. Second sheet sorting slot, 5. Magnetic steel assembly slot, 6. Rivet, 7. Magnetic steel, 8. Magnetic isolation layer, 9. First punching unit, 10. Second punching unit 11. Third punching unit, 12. Fourth punching unit, 13. Outer layer arrangement circle, 14. Inner layer arrangement circle. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Embodiment 1:

[0050] like Figures 1 to 8 As shown, the present invention discloses a method for manufacturing a segmented skewed-pole permanent magnet motor rotor. This embodiment takes an embedded permanent magnet synchronous motor rotor with six magnetic poles 2p as an example to further describe the details of the manufacturing method. The method includes the following steps:

[0051] Production and punching unit:

[0052] S1. Six radial magnetic steel assembly grooves 5 are dug at equal intervals on the punch body. Two adjacent magnetic steel assembly grooves 5 are symmetrical to each other. A shaft hole is opened in the middle of the punch body.

[0053] S2. Make an outer arrangement circle 13 and an inner arrangement circle 14 between the magnetic steel assembly groove 5 and the shaft hole. Preferably, the distance between the edge of the outer riveting hole 1 and the edge of the inner riveting hole 2 is greater than or equal to 1 mm. A symmetry line OC of two adjacent magnetic steel assembly grooves 5 is made through the center point O of the rotating shaft, and a straight line with an angle of α with the line segment OC is made through the center point O of the rotating shaft, intersecting the outer layer arrangement circle 13 at point A, and extending OA in the reverse direction to intersect the inner layer arrangement circle 14 at point A'; a straight line with an angle of β with the line segment OA is made through the center point O of the rotating shaft, intersecting the inner layer arrangement circle 14 at point B, and extending OB in the reverse direction to intersect the outer layer arrangement circle 13 at point B', and A, B, A', and B' are respectively arranged in a circular array around point O with the number of items P=rotor pole pairs 3, and the twelve points obtained are the center point positions of the six inner layer rivet holes 2 and the six outer layer rivet holes 1, and the inner layer rivet holes 2 and the outer layer rivet holes 1 are opened according to the center point positions; the angle β is equal to the skew pole angle when the rotor of the segmented skew pole permanent magnet motor is segmented into four segments, and β=2α.

[0054] S3. Two sheet sorting slots are arranged on the shaft hole, namely the first sheet sorting slot 3 and the second sheet sorting slot 4; the center line of the first sheet sorting slot 3 is located on the straight line AA' close to the point A side, and the center line of the second sheet sorting slot 4 is located on the straight line BB' close to the point B' side.

[0055] Assembling the punching unit:

[0056] S4. Place the magnetic steel 7 in the oblique magnetic steel assembly groove 5, and then overlap several sections of the punching sheet units according to the preset oblique polar angle, and then use rivets 6 to pass through the inner layer rivet holes 2 and the outer layer rivet holes 1 that are connected to the several sections of the punching sheet units in sequence to fix them into one, so as to make a permanent magnet motor rotor.

[0057] The angle of the preset segment oblique polar angle θ can be calculated using the following formula:

[0058]

[0059] Among them, θ is the preset segmented skew angle; Z is the number of stator slots; 2p is the number of rotor poles; N is the number of rotor segments; LCM (Z, 2p) represents the least common multiple of the number of stator slots Z and the number of rotor poles 2p.

[0060] The following formulas are used to calculate the oblique polar angles θ2 and θ4 of two adjacent segments with 2 and 4 segments respectively:

[0061]

[0062]

[0063] That is, when the number of segments is 4, the oblique polar angle θ4 between two adjacent segments is half of the oblique polar angle θ2 when the number of segments is 2. That is, β = θ4 = 2α = 1 / 2θ2.

[0064] This embodiment takes the example of stacking and riveting two sections of punching sheet units to form a motor rotor structure to further describe the details of the manufacturing method.

[0065] like Figure 4 , Figure 5 As shown, in step S4, the specific operation of superimposing the two sections of the punching unit is: the two sections of the punching unit are respectively recorded as the first punching unit 9 and the second punching unit 10. When superimposing, take out the second punching unit 10, turn it over, place it under the first punching unit 9, and rotate it until the center line of the second sheet sorting slot 4 of the second punching unit 10 is aligned with the center line of the first sheet sorting slot 3 of the first punching unit 9. At this time, the oblique polar angle θ2 of the rotor is 2β, and the inner and outer layer rivet holes 1 of the first punching unit 9 and the inner and outer layer rivet holes 1 of the second punching unit 10 are respectively connected. The rivet 6 passes through a number of connected inner layer rivet holes 2 and outer layer rivet holes 1 to fix them as a whole.

[0066] Preferably, during riveting, the rivets 6 are staggered through half the number of the inner layer riveting holes 2 and the outer layer riveting holes 1 and fixed as a whole.

[0067] The punching unit adopts the design of staggered riveting of inner and outer two-layer holes. The preset segmented oblique pole angle is reasonably preset with the sheet arrangement slot and riveting hole position for positioning. The punching processing accuracy is used to ensure the assembly positioning accuracy of the segmented oblique pole, without the need for additional angle positioning tooling. The assembly process is simplified and the production cost is reduced. After the punching unit is stacked in a specified manner, it can be directly riveted to form a segmented oblique pole permanent magnet motor rotor structure. Not only can the deflection angle accuracy of each section be guaranteed, but the process is simple and the yield rate is high.

[0068] In order to reduce the magnetic leakage of the magnetic steel 7 of two adjacent segments and improve the efficiency of the permanent magnet motor, a magnetic isolation layer 8 is placed between the two adjacent segments of the punching unit when stacked. The magnetic isolation layer 8 is provided with a connecting hole connected to the inner layer riveting hole 2 and the outer layer riveting hole 1. The assembly accuracy and reliability can be guaranteed.

[0069] The magnetic isolation layer 8 is made of non-ferromagnetic material, and the thickness of the magnetic isolation layer 8 is 1-3 mm.

[0070] Embodiment 2:

[0071] like Figure 7 , Figure 8 As shown, the present invention discloses a method for manufacturing a segmented skew-pole permanent magnet motor rotor. This embodiment takes the example of stacking and riveting four-segment punching units with six magnetic poles 2p to form a motor rotor structure, and further describes the details of the manufacturing method.

[0072] The punching unit is provided with four sections, which are respectively recorded as the first punching unit 9, the second punching unit 10, the third punching unit 11 and the fourth punching unit 12; from top to bottom, the fourth punching unit 12, the first punching unit 9, the third punching unit 11, and the second punching unit 10 are stacked in sequence.

[0073] First, the third punching unit 11 is taken out and turned over, placed under the first punching unit 9 , and rotated until the center lines of the first sorting slot 3 of the third punching unit 11 and the first sorting slot 3 of the first punching unit 9 are aligned.

[0074] The second punching unit 10 is taken out and turned over, placed below the third punching unit 11 , and rotated until the center lines of the second sheet sorting slot 4 of the second punching unit 10 and the first sheet sorting slot 3 of the first punching unit 9 are aligned.

[0075] The fourth punching unit 12 is taken out, placed above the first punching unit 9 , and rotated until the center lines of the second sheet sorting slot 4 of the fourth punching unit 12 and the first sheet sorting slot 3 of the first punching unit 9 are aligned.

[0076] At this time, the oblique polar angle θ4 = β = 2α, such as Figure 3 The dark riveting holes are completely connected to each other, and the rivets 6 pass through the connected riveting holes in sequence to fix them as a whole.

[0077] Other technical features are consistent with those of the first embodiment.

[0078] The punching unit is suitable for permanent magnet synchronous motors with any number of pole pairs. By cleverly arranging the positions of the riveting holes, the structure can simultaneously meet the needs of two types of rotors with axial segment numbers N of 2 and 4. This increases the types of products that can be adapted, saves stamping die costs, simplifies the types of accessories, and optimizes inventory.

[0079] Embodiment three:

[0080] like Figures 1 to 8 As shown, the present invention also discloses a segmented oblique pole permanent magnet motor rotor structure, which is manufactured using the segmented oblique pole permanent magnet motor rotor manufacturing method of Example 1 or Example 2, and includes a plurality of punching sheet units. The plurality of segments of the punching sheet units are overlapped at a preset oblique pole angle, and rivets 6 are respectively passed through the inner layer rivet holes 2 and the outer layer rivet holes 1 that are connected to the plurality of segments of the punching sheet units to fix them together to form a motor rotor structure.

[0081] In order to reduce the magnetic leakage of the magnetic steel 7 between two adjacent segments and improve the efficiency of the permanent magnet motor, a magnetic isolation layer 8 is provided between two adjacent segments of the punching unit, and a connecting hole connected to the inner riveting hole 2 and the outer riveting hole 1 is provided on the magnetic isolation layer 8 to ensure assembly accuracy and reliability. The magnetic isolation layer 8 is made of non-ferromagnetic material. The thickness of the magnetic isolation layer 8 is 1-3 mm.

[0082] This embodiment takes two or four sections of punching units with a magnetic pole number 2p of six as an example of overlapping and riveting a motor rotor structure, and further describes the details of the motor rotor structure in the present invention.

[0083] Generally, the rotor segmented skew poles are designed with the same stack thickness and equal skew angles in each segment. The preset segmented skew angle can be calculated using the following formula:

[0084]

[0085] Among them, θ is the preset segmented skew angle; Z is the number of stator slots; 2p is the number of rotor poles; N is the number of rotor segments; LCM (Z, 2p) represents the least common multiple of the number of stator slots Z and the number of rotor poles 2p.

[0086] The following formulas are used to calculate the oblique polar angles θ2 and θ4 of two adjacent segments with 2 and 4 segments respectively:

[0087]

[0088]

[0089] That is, when the number of segments is 4, the oblique polar angle θ4 between two adjacent segments is half of the oblique polar angle θ2 when the number of segments is 2.

[0090] The punching unit includes a punching body with six magnetic poles, and a shaft hole is arranged in the center of the punching body. Six oblique magnetic steel assembly grooves 5 are arranged at equal intervals on the punching body, and magnetic steel 7 is arranged in the magnetic steel assembly groove 5. The inner layer riveting holes 2 and the outer layer riveting holes 1 are arranged circumferentially between the magnetic steel assembly grooves 5 and the shaft hole. In order to extend the life of the riveting holes, the distance between the edge of the inner layer riveting hole 2 and the edge of the outer layer riveting hole 1 is greater than or equal to 1mm.

[0091] like Figure 1 As shown, the number of pole pairs of the punch body is 3, and the riveting holes include six outer riveting holes 1 and six inner riveting holes 2 arranged in a circle; the center points of the outer riveting holes 1 are set to be A along the circumferential direction. n (n=1,2,3,...,2p), namely A1, A2, A3, A4, A5 and A6, the center point of each inner layer riveting hole 2 is marked as B along the circumferential direction n (n=1,2,3,...,2p), namely B1, B2, B3, B4, B5 and B6.

[0092] Among them A n Point and B n+1 The angles formed by the line connecting the points (n=1, 2, 3, ..., 2p-1) and the center of the shaft O and A 2pThe angles formed by the lines connecting point A and point B1 with the center of the rotating shaft O are both 180° / p, that is, ∠A1OB2=∠A2OB3=∠A3OB4=∠A4OB5=∠A5OB6=∠A6OB1=180° / 3=60°.

[0093] A n Point and B n The angle formed by the lines connecting the points (n=1, 2, 3, ..., 2p) and the center of the rotating shaft O is β, that is, ∠A1OB1=∠A2OB2=∠A3OB3=∠A4OB4=∠A5OB5=∠A6OB6=β.

[0094] The angle ∠A1OC between the line A1O connecting point A1 and the center of the shaft O and the symmetry line OC of two adjacent magnetic steel assembly grooves 5 is α;

[0095] The angle β is equal to the degree of the skew angle when the segmented skew pole permanent magnet motor rotor is segmented into four segments, and β=θ4=2α;

[0096] There are two sheet sorting slots, namely the first sheet sorting slot 3 and the second sheet sorting slot 4. The center line of the first sheet sorting slot 3 is located on the straight line A1O near the point A1, and the center line of the second sheet sorting slot 4 is located on the straight line B1O near the extension line of the point O. The center of gravity of the punching unit is close to the point O. In addition to being used as a positioning punching unit, the sheet sorting slot can also be used as a keyway when the motor shaft is subsequently pressed.

[0097] When the punching sheet unit of the motor rotor structure is composed of two sections, they are respectively recorded as a first punching sheet unit 9 and a second punching sheet unit 10 .

[0098] The first punching unit 9 is kept as Figure 1 Direction placement, such as Figure 2 As shown in the solid line part. The bottom surface of the first punch unit 9 is in contact with the bottom surface of the second punch unit 10, and the second sheet sorting slot 4 of the second punch unit 10 is aligned with the center line of the first sheet sorting slot 3 of the first punch unit 9. At this time, the rotor's oblique polar angle θ2 = 2β, the inner and outer riveting holes 1 of the first punch unit 9 and the inner and outer riveting holes 1 of the second punch unit 10 are connected respectively, and the two sheet sorting slots can also be used as keyways. The rivet 6 passes through a number of connected inner riveting holes 2 and outer riveting holes 1 to fix them into one.

[0099] When the punching sheet unit of the motor rotor structure is divided into four sections, they are respectively recorded as a first punching sheet unit 9, a second punching sheet unit 10, a third punching sheet unit 11 and a fourth punching sheet unit 12.

[0100] From top to bottom, the fourth punch unit 12, the first punch unit 9, the third punch unit 11, and the second punch unit 10 are stacked in sequence. Among them, the bottom surface of the third punch unit 11 is in contact with the bottom surface of the first punch unit 9, and the first sheet sorting slot 3 of the third punch unit 11 is aligned with the center line of the first sheet sorting slot 3 of the first punch unit 9. The bottom surface of the second punch unit 10 is in contact with the top surface of the third punch unit 11, and the second sheet sorting slot 4 of the second punch unit 10 is aligned with the center line of the first sheet sorting slot 3 of the first punch unit 9. The bottom surface of the fourth punch unit 12 is in contact with the top surface of the first punch unit 9, and the second sheet sorting slot 4 of the fourth punch unit 12 is aligned with the center line of the first sheet sorting slot 3 of the first punch unit 9. At this time, the oblique polar angle θ4=β=2α, such as Figure 3 The dark riveting holes are completely connected. The first sheet sorting slots 3 of the first punching unit 9 and the third punching unit 11 are aligned with the second sheet sorting slots 4 of the second punching unit 10 and the fourth punching unit 12, and can be used as key slots.

[0101] The rivets 6 pass through the riveting holes that are connected in the four-section punching unit in sequence and fix them into one.

[0102] In summary, the present invention adopts a punching unit with preset riveting holes and sheet sorting grooves, and can directly perform riveting after the punching unit adopts a specific stacking method, which not only ensures the accuracy of each deflection angle and the simplicity of the process, but also improves the yield and production efficiency.

[0103] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for manufacturing a segmented skew-pole permanent magnet motor rotor, characterized in that: The following steps are involved: Production and punching unit: S1. Dig a number of magnetic steel assembly grooves at equal intervals on the punch body that match the magnetic steel arrangement, and open a shaft hole in the middle; S2. Make an outer arrangement circle and an inner arrangement circle between the magnetic steel assembly groove and the shaft hole; make a symmetry line OC of two adjacent magnetic steel assembly grooves through the shaft center O, make a straight line with an angle of α with the line segment OC through the shaft center O, intersect with the outer arrangement circle at point A, and extend OA in the reverse direction to intersect with the inner arrangement circle at point A'; make a straight line with an angle of β with the line segment OA through the shaft center O, intersect with the inner arrangement circle at point B, extend OB in the reverse direction to intersect with the outer arrangement circle at point B', and make a circular array of A, B, A', and B' around point O with the number of items P=rotor pole pairs p, and the obtained points are the center point positions of each inner riveting hole and outer riveting hole, and the inner riveting holes and outer riveting holes are opened according to the center point positions; wherein the angle β is equal to the skew angle when the rotor of the segmented skew pole permanent magnet motor is segmented into four segments, and β=2α; S3, two sheet sorting slots are arranged on the shaft hole, namely, a first sheet sorting slot and a second sheet sorting slot; the center line of the first sheet sorting slot is located on the straight line AA' close to the point A side, and the center line of the second sheet sorting slot is located on the straight line BB' close to the point B' side; Assembling the punching unit: S4. Place the magnetic steel in the oblique magnetic steel assembly slot, and then assemble several sections of the punching unit according to the preset segmented oblique angle. After stacking, rivets are sequentially passed through the inner riveting holes and outer riveting holes that are connected to several sections of punching sheet units to fix them as a whole, so as to form a permanent magnet motor rotor; the punching sheet unit is provided with two sections, namely the first punching sheet unit and the second punching sheet unit; when stacking, the taken out second punching sheet unit is turned over and placed under the first punching sheet unit, and rotated until the second sheet sorting groove of the second punching sheet unit is aligned with the center line of the first sheet sorting groove of the first punching sheet unit. When stacking, a magnetic isolation layer is also placed between two adjacent sections of the punching sheet units, and the magnetic isolation layer is provided with connecting holes connected to the inner riveting holes and the outer riveting holes; when riveting, the rivets are taken from half the number of the inner riveting holes and the outer riveting holes, staggered and passed through to fix them as a whole; The preset segmented oblique polar angle The angle is calculated using the following formula: Among them, θ is the preset segmented skew angle; Z is the number of stator slots; 2p is the number of rotor poles; N is the number of rotor segments; LCM (Z, 2p) represents the least common multiple of the number of stator slots Z and the number of rotor poles 2p.

2. The method for manufacturing a segmented skew-pole permanent magnet motor rotor according to claim 1, characterized in that: The distance between the edge of the outer layer riveting hole and the edge of the inner layer riveting hole is greater than or equal to 1 mm.

3. The method for manufacturing a segmented skew-pole permanent magnet motor rotor according to claim 1, characterized in that: The magnetic isolation layer is made of non-ferromagnetic material.

4. The method for manufacturing a segmented skew-pole permanent magnet motor rotor according to claim 1, characterized in that: The thickness of the magnetic isolation layer is 1-3 mm.

5. A method for manufacturing a segmented skew-pole permanent magnet motor rotor, characterized in that The following steps are involved: Production and punching unit: S1. Dig a number of magnetic steel assembly grooves at equal intervals on the punch body that match the magnetic steel arrangement, and open a shaft hole in the middle; S2. Make an outer arrangement circle and an inner arrangement circle between the magnetic steel assembly groove and the shaft hole; make a symmetry line OC of two adjacent magnetic steel assembly grooves through the shaft center O, make a straight line with an angle of α with the line segment OC through the shaft center O, intersect with the outer arrangement circle at point A, and extend OA in the reverse direction to intersect with the inner arrangement circle at point A'; make a straight line with an angle of β with the line segment OA through the shaft center O, intersect with the inner arrangement circle at point B, extend OB in the reverse direction to intersect with the outer arrangement circle at point B', and make a circular array of A, B, A', and B' around point O with the number of items P=rotor pole pairs p, and the obtained points are the center point positions of each inner riveting hole and outer riveting hole, and the inner riveting holes and outer riveting holes are opened according to the center point positions; wherein the angle β is equal to the skew angle when the rotor of the segmented skew pole permanent magnet motor is segmented into four segments, and β=2α; S3, two sheet sorting slots are arranged on the shaft hole, namely, a first sheet sorting slot and a second sheet sorting slot; the center line of the first sheet sorting slot is located on the straight line AA' close to the point A side, and the center line of the second sheet sorting slot is located on the straight line BB' close to the point B' side; Assembling the punching unit: S4. Place the magnetic steel in the oblique magnetic steel assembly slot, and then assemble several sections of the punching unit according to the preset segmented oblique angle. After stacking, rivets are sequentially passed through the inner riveting holes and the outer riveting holes that are connected to the plurality of sections of the punching units to fix them together to form a permanent magnet motor rotor; The punching unit is provided with four sections, namely the first punching unit, the second punching unit, the third punching unit and the fourth punching unit; from top to bottom, the fourth punching unit, the first punching unit, the third punching unit and the second punching unit are stacked in sequence; Firstly, take out the third punching unit and turn it over, place it under the first punching unit, and rotate it until the center line of the first sheet sorting slot of the third punching unit is aligned with the center line of the first sheet sorting slot of the first punching unit; Take out the second punching unit, turn it over, place it below the third punching unit, and rotate it until the center line of the second sheet sorting slot of the second punching unit is aligned with the center line of the first sheet sorting slot of the first punching unit; Take out the fourth punching unit, place it above the first punching unit, and rotate it until the center line of the second sheet sorting slot of the fourth punching unit is aligned with the center line of the first sheet sorting slot of the first punching unit; When stacked, a magnetic isolation layer is placed between two adjacent sections of the punching unit, and the magnetic isolation layer is provided with a connecting hole connected to the inner layer riveting hole and the outer layer riveting hole; the rivets pass through the riveting holes connected in the four sections of the punching unit in sequence and fix them into one; The preset segmented oblique polar angle The angle is calculated using the following formula: Among them, θ is the preset segmented skew angle; Z is the number of stator slots; 2p is the number of rotor poles; N is the number of rotor segments; LCM (Z, 2p) represents the least common multiple of the number of stator slots Z and the number of rotor poles 2p.

6. The method for manufacturing a segmented skew-pole permanent magnet motor rotor according to claim 5, characterized in that: The distance between the edge of the outer layer riveting hole and the edge of the inner layer riveting hole is greater than or equal to 1 mm.

7. The method for manufacturing a segmented skew-pole permanent magnet motor rotor according to claim 5, characterized in that: The magnetic isolation layer is made of non-ferromagnetic material.

8. The method for manufacturing a segmented skew-pole permanent magnet motor rotor according to claim 5, characterized in that: The thickness of the magnetic isolation layer is 1-3 mm.

9. A segmented skew-pole permanent magnet motor rotor structure, characterized in that: The rotor is manufactured by the method for manufacturing a segmented oblique-pole permanent magnet motor according to any one of claims 1 to 8, wherein the number of pole pairs of the punching sheet body is p, and the rivet holes include 2p outer rivet holes and 2p inner rivet holes arranged circumferentially; the center point of each outer rivet hole is set to be recorded along the circumferential direction. (n=1,2,3,...,2p), the center point of each inner riveting hole along the circumferential direction is recorded as (n=1,2,3,...,2p); in Point and The angle between the points (n=1,2,3,...,2p-1) and the line connecting the center of the axis O and Point and The angles formed by the lines connecting the points and the center of the axis O are all 180° / p; Point and The angle between the line connecting the points (n=1,2,3,...,2p) and the center of the rotation axis O is β; The line connecting the point and the center of the axis O The angle between O and the symmetry line OC of two adjacent magnetic steel assembly grooves is α; The angle β is equal to the skew angle of the segmented skew pole permanent magnet motor rotor when the segment is four, and β=2α; There are two sheet sorting slots, namely a first sheet sorting slot and a second sheet sorting slot. The center line of the first sheet sorting slot is located on a straight line. O on close Point side, the center line of the second sorting slot is located on the straight line On the side of O close to the extension line of point O.

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