Flat wire stator flaring process method and flat wire stator flaring cutter

Abstract

The invention discloses a flat wire stator flaring process method and a flat wire stator flaring cutter. According to the method, the number of layers of flat wires in each stator groove is eight, and the method for flaring the eight layers of flat wires in a certain stator groove comprises the steps that the eighth layer of flat wires are squeezed and pushed from the outer side in the radial direction of a stator, so that the eight layers of flat wires are in tight contact and are not exploded; the flat wires on the seventh layer and the eighth layer are sleeved, and wire drawing and flaring are conducted outwards; the flat wires on the fifth layer and the sixth layer are sleeved, and wire drawing and flaring are conducted outwards; the first layer, the second layer, the third layer and the fourth layer of flat wires are sleeved, and wire drawing and flaring are carried out towards the outer side; wherein the eight layers of flat wires in the stator slots are sequentially from the first layer to the eighth layer from the center of the stator to the outside. According to the characteristics of different lengths of flat wire lead heads, linkage actions of axial servo and horizontal servo can be optimized, actions such as sleeving, pushing and pulling are carried out, high-quality layered flaring is achieved, and the flaring qualification rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of flat wire motors, and in particular to a flat wire stator expanding process method and a flat wire stator expanding knife. Background Art

[0002] The traditional and common expansion method is the double-layer expansion method using a clamping jaw. The two clamping pieces of the expansion clamping jaw are closed by a cylinder, and the power head drives the entire axis to move downward to the position of the flat wire head. The clamping jaw closes and clamps the lead wire and pulls it outward, completing the expansion layer by layer, slot by slot. This method has poor overall flexibility, and it is difficult to ensure concentricity after the change of shape. The expansion size varies greatly, and the lead wire may be clamped during the closing process of the clamping jaw, causing the product to be scrapped, and there is a problem of wire leakage during the clamping process. Summary of the invention

[0003] The problem to be solved by the present invention is to overcome the defects of the prior art, provide a flat wire stator expanding process method and a flat wire stator expanding knife, adopt a sleeve pulling method to achieve layered expanding, and improve the expanding efficiency and quality.

[0004] To solve the above technical problems, the present invention provides a flat wire stator expansion process method on one hand, wherein the number of flat wire layers in each stator slot is 8, and the method for expanding the 8 layers of flat wire in a certain stator slot comprises: squeezing and pushing the 8th layer of flat wire from the outside along the radial direction of the stator so that the 8 layers of flat wire are in close contact with each other without bursting; enclosing the 7th and 8th layers of flat wire and pulling them outward to expand; enclosing the 5th and 6th layers of flat wire and pulling them outward to expand; enclosing the 1st, 2nd, 3rd and 4th layers of flat wire and pulling them outward to expand; wherein the 8 layers of flat wire in the stator slot are the 1st to the 8th layers from the center of the stator to the outside.

[0005] As an improvement of the flat wire stator expansion process of the present invention, the step of squeezing and pushing the eighth layer of flat wires from the outside along the radial direction of the stator so that the eight layers of flat wires are in close contact without being exploded includes:

[0006] By moving the expanding knife along the radial direction of the stator, the end of the expanding knife is used to push the outer side of the end of the 8th layer of flat wire, so that the 8 layers of flat wires are in close contact without bursting.

[0007] As another improvement of the flat wire stator expansion process of the present invention, the expansion of the flat wires of the seventh and eighth layers by pulling them outwards comprises:

[0008] Move the flaring knife inward along the radial direction of the stator, so that the 8th layer of flat wire faces the center of the flaring hole of the flaring knife along the axial direction of the stator;

[0009] Move the flaring knife along the axial direction of the stator, so that the flaring hole covers the end of the 8th layer of flat wire, and the bottom edge of the end of the flaring knife is lower than the top of the 6th layer of flat wire, and the flaring knife has no contact with the 7th layer of flat wire;

[0010] Move the flaring knife inward along the radial direction of the stator, so that a gap appears between the 6th and 7th layers of flat wires, and the 7th and 8th layers of flat wires are both facing the flaring hole along the axial direction of the stator;

[0011] Move the expansion knife along the stator axial direction to the expansion wire pulling position, so that the expansion hole covers the 7th layer flat wire and the 8th layer flat wire;

[0012] The expanding knife moves radially outwardly along the stator to expand, completing the expansion of the 7th and 8th flat wire layers.

[0013] Furthermore, when the flaring knife is moved along the axial direction of the stator, the flaring hole covers the end of the 8th layer of flat wire, and the bottom edge of the end of the flaring knife is lower than the top of the 6th layer of flat wire, and the flaring knife has no contact with the 7th layer of flat wire:

[0014] The bottom edge of the end of the flaring knife is at least 2-4 mm, preferably 3 mm, below the top of the sixth layer of flat wire.

[0015] Furthermore, the flaring cutter is moved radially inwardly of the stator so that a gap appears between the 6th and 7th layers of flat wires, and the 7th and 8th layers of flat wires are both facing the flaring hole along the axial direction of the stator:

[0016] The maximum gap between the sixth layer of flat wires and the seventh layer of flat wires along the radial direction of the stator is not less than 1-3 mm, preferably 2 mm.

[0017] As another improvement of the flat wire stator expansion process of the present invention, the expansion of the flat wires by enclosing the fifth and sixth layers of flat wires and pulling them outwards comprises:

[0018] Move the flaring knife inward along the radial direction of the stator, so that the sixth layer of flat wire is aligned with the center of the flaring hole of the flaring knife along the axial direction of the stator;

[0019] Move the flaring knife along the axial direction of the stator so that the flaring hole covers the end of the sixth layer of flat wire and the flaring knife has no contact with the fifth layer of flat wire;

[0020] Move the flaring knife inward along the radial direction of the stator, so that the fifth and sixth layers of flat wires are both facing the flaring hole along the axial direction of the stator;

[0021] Move the flaring knife along the axial direction of the stator so that the flaring hole covers the ends of the fifth and sixth layers of flat wires, and the flaring knife has no contact with the fourth layer of flat wires;

[0022] Move the flaring knife radially outwards along the stator to create a gap between the 4th and 5th layers of flat wires;

[0023] Move the expansion knife along the stator axial direction to the expansion wire pulling position, so that the expansion hole covers the fifth and sixth layers of flat wires;

[0024] The expanding knife is moved radially outwardly along the stator to expand the wires, thereby completing the expansion of the fifth and sixth layers of flat wires.

[0025] Furthermore, the expanding knife is moved radially outwardly of the stator to form a gap between the fourth and fifth layers of flat wires;

[0026] The maximum gap between the 4th and 5th layers of flat wires along the radial direction of the stator is not less than 1-3 mm, preferably 2 mm.

[0027] As another improvement of the flat wire stator expansion process of the present invention, the process of enclosing the first layer, the second layer, the third layer and the fourth layer of flat wires and expanding them outwards comprises:

[0028] Move the flaring knife inward along the radial direction of the stator, so that the first layer of flat wires faces the center of the flaring hole of the flaring knife along the axial direction of the stator, and the third layer of flat wires faces the avoidance slot hole of the flaring along the axial direction of the stator;

[0029] Move the flaring knife along the axial direction of the stator, so that the flaring hole covers the end of the first layer of flat wires, the avoidance slot hole covers the third layer of flat wires, and the flaring knife has no contact with the second and fourth layers of flat wires;

[0030] Move the flaring knife radially outwards along the stator to create a gap between the second and third layers of flat wires;

[0031] Move the expansion knife along the stator axial direction to the expansion wire pulling position, so that the expansion hole covers the first and second layers of flat wires, and the avoidance slot hole covers the third and fourth layers of flat wires;

[0032] The expanding knife is moved radially outwardly along the stator to expand the flat wires, and the first, second, third and fourth layers of flat wires are expanded.

[0033] Furthermore, the expanding knife is moved radially outwardly of the stator to form a gap between the second and third layers of flat wires;

[0034] The maximum gap between the second and third layers of flat wires along the radial direction of the stator is not less than 1-3 mm, preferably 2 mm.

[0035] As another improvement to the flat wire stator expanding process method of the present invention, the height of the flat wire ends of each layer extending out of the stator slot is: the flat wire ends of the first layer are higher than those of the second layer, the flat wire ends of the third layer are higher than those of the second layer, the flat wire ends of the third layer are higher than those of the fourth layer, the flat wire ends of the fifth layer are higher than those of the fourth layer, the flat wire ends of the sixth layer are higher than those of the fifth layer, the flat wire ends of the sixth layer are higher than those of the seventh layer, and the flat wire ends of the eighth layer are higher than those of the seventh layer.

[0036] Preferably, the height of the flat wire ends of each layer extending out of the stator slots is: the flat wire ends of the first layer are higher than those of the sixth layer, the flat wire ends of the sixth layer are higher than those of the third layer; the flat wire ends of the third layer are higher than those of the first layer; the flat wire ends of the first layer are higher than those of the fifth layer; the flat wire ends of the fifth layer are higher than those of the seventh layer; the flat wire ends of the seventh layer are lower than those of the fourth layer; and the flat wire ends of the fourth layer are higher than those of the second layer.

[0037] To solve the above technical problems, the present invention provides, on the other hand, a flat wire stator expanding tool for implementing the above flat wire stator expanding process method, comprising a tool body, the tool body is in the shape of a long strip, and a expanding hole is provided at one end, and an avoidance slot is provided on one side of the expanding hole.

[0038] Furthermore, the cross section of the avoidance slot is rectangular, and the long side of the cross section is along the length direction of the tool body; the bottom edge of the avoidance slot close to the stator is chamfered to facilitate the insertion of the flat wire.

[0039] Furthermore, the cross section of the expanded hole is rectangular, and the wide side of the cross section is along the length direction of the tool body; the bottom edge of the expanded hole on one side close to the stator is chamfered to facilitate the insertion of the flat wire.

[0040] In summary, the above-mentioned flat wire stator expanding process method and flat wire stator expanding knife are adopted. The process method can pre-arrange the flat wire to ensure the consistency of the flat wire before expanding and improve the expansion qualification rate; according to the different length characteristics of the flat wire lead head, the linkage action of the axial servo and the horizontal servo can be optimized to perform sleeve, push, pull and other actions to achieve high-quality layered expansion and improve the expansion qualification rate; and when there are gaps between different flat wire layers and there are certain differences or misalignments in the axial length of the flat wire, the sleeve, push and pull actions can still ensure the qualification rate of the sleeve wire expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In the attached picture:

[0042] Figure 1 It is a schematic diagram of the first position of the expanding knife in the flat wire stator expanding process method of the present invention.

[0043] Figure 2 It is a schematic diagram of the second position of the expanding knife in the flat wire stator expanding process method of the present invention.

[0044] Figure 3 It is a schematic diagram of the third position of the expanding knife in the flat wire stator expanding process method of the present invention.

[0045] Figure 4 It is a schematic diagram of the fourth position of the expanding knife in the flat wire stator expanding process method of the present invention.

[0046] Figure 5 It is a schematic diagram of the fifth position of the expanding knife in the flat wire stator expanding process method of the present invention.

[0047] Figure 6 It is a schematic diagram of the sixth position of the expanding knife in the flat wire stator expanding process method of the present invention.

[0048] Figure 7 It is a schematic diagram of the seventh position of the expanding knife in the flat wire stator expanding process method of the present invention.

[0049] Figure 8 It is a schematic structural diagram of the flat wire stator expanding knife of the present invention.

[0050] Fig. 9 It is a schematic cross-sectional view of the flat wire stator expanding knife of the present invention.

[0051] Fig.10 It is a schematic diagram of the flat wire in a single stator slot after expanding in the flat wire stator expanding process method of the present invention.

[0052] In the figure, 101 is the tool body; 102 is the expansion hole; 103 is the avoidance slot hole; 104 is the mounting hole. DETAILED DESCRIPTION

[0053] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0054] Example 1

[0055] Figure 1-7 The present invention shows a flat wire stator expansion process method. In the flat wire stator expansion process method, the number of flat wire layers in each stator slot is 8, and the method for expanding the 8 layers of flat wire in a stator slot includes the following steps S10-S40, and the 8 layers of flat wire in the stator slot are sequentially from the 1st layer to the 8th layer from the center of the stator to the outside.

[0056] Step S10: Push the 8th layer of flat wires from the outside along the radial direction of the stator to make the 8 layers of flat wires closely contact each other without bursting. Specifically, the flaring knife can be moved along the radial direction of the stator to push the end of the 8th layer of flat wires outside the end of the 8th layer of flat wires with the end of the flaring knife to make the 8 layers of flat wires closely contact each other without bursting.

[0057] like Figure 1 As shown, the expansion knife is first moved axially to the height of the 7-8th layer line position, and then moved radially inward to squeeze the first hairpin line to ensure the hairpin line, so that the hairpin flat wires are in close contact without explosion, and the 8 layers of flat wires in the stator slot are pre-sorted to ensure the consistency of the flat wires before expansion, and improve the expansion qualification rate. Note that the length direction of the expansion knife tool body 101 is along the radial direction of the stator and is aligned with the target stator slot.

[0058] Step S20: Wrap the 7th and 8th layers of flat wires and pull them outward to expand. The first expansion completes the expansion of 7-8 layers: the expansion knife first moves radially to the 8th layer of flat wire at the center of the expansion hole. Figure 2 As shown; then axially sleeve the wire so that the 8th layer of flat wire enters the flaring hole, the 7th layer of flat wire has no axial contact with the flaring tool, and the 6th layer of flat wire overlaps with the flaring tool in the horizontal direction by more than 3mm, as shown Figure 3 As shown; then move the flaring knife to the inner layer, so that the 7th layer of flat wire is in the flaring knife hole, and then continue to move to the inner layer until there is a gap of about 2mm between the 6th and 7th layers; then move the flaring knife axially to the flaring wire pulling position (given by the motor design); finally move the flaring knife outward to flare, and complete the 7th and 8th layer flaring. Specifically, it includes the following steps a1-a5.

[0059] Step a1: Move the flaring knife inward along the radial direction of the stator, so that the 8th layer of flat wire is facing the center of the flaring hole of the flaring knife along the axial direction of the stator, as shown in the figure. Figure 2 As shown, initial positioning is performed, and at this time the flaring knife is higher than the end of the 8th layer of flat wire.

[0060] Step a2: Move the flaring knife along the axial direction of the stator, so that the flaring hole covers the end of the 8th layer of flat wire, and the bottom edge of the end of the flaring knife is lower than the top of the 6th layer of flat wire, and the flaring knife has no contact with the 7th layer of flat wire. Figure 3 As shown, the first sleeve action is performed to sleeve the 8th layer of flat wire using the expanded hole.

[0061] In some embodiments, the bottom edge of the end of the flaring knife is at least 2-4 mm, preferably 3 mm, below the top of the sixth layer of flat wire.

[0062] Step a3: Move the flaring knife radially inwardly of the stator to create a gap between the 6th and 7th layers of flat wires, and both the 7th and 8th layers of flat wires are axially opposite to the flaring hole of the stator; perform the first push operation, using the flaring knife to push the 6th layer of flat wires, so that a gap appears between the 6th and 7th layers of flat wires to facilitate the flaring knife to move down and continue to cover the 7th layer of flat wires.

[0063] In some embodiments, the gap between the sixth layer of flat wires and the seventh layer of flat wires is not less than 1-3 mm at the maximum point along the radial direction of the stator.

[0064] Step a4: Move the expansion knife along the stator axial direction to the expansion wire drawing position, so that the expansion hole covers the 7th layer flat wire and the 8th layer flat wire. It should be noted that the expansion wire drawing position is a given value according to the specific motor design.

[0065] Step a5: The expanding knife moves radially outwardly along the stator to expand, completing the expansion of the 7th and 8th flat wire layers.

[0066] Step S30: Wrap the 5th and 6th layers of flat wires and pull them outward to expand. The second time to complete the 5-6th layer expansion: first, move the expansion knife radially until the 6th layer of flat wire is at the center of the expansion hole. Figure 4 As shown; then move the flaring cutter axially, sleeve the wire until the 6th layer of flat wire enters the cutter hole, and the 5th layer of flat wire has no axial contact with the flaring cutter, as shown Figure 5 As shown; then the flaring knife moves to the inner layer until the 5-6 flat wires are all in the flaring knife hole; then the flaring knife is moved axially until the 5-layer flat wire is inserted into the flaring knife hole and the 4-layer flat wire has no axial contact with the flaring knife; then the flaring knife is moved to the outer layer until a 2mm gap appears between the 4-5 layers; then the flaring knife is moved axially to the 5-6 layer wire expansion and wire insertion position; finally, the flaring knife is moved to the outer layer for flaring, and the 5-6 layer flaring is completed. Specifically, it includes the following steps b1-b7.

[0067] Step b1: Move the flaring knife inward along the radial direction of the stator so that the sixth layer of flat wire is directly opposite to the center of the flaring hole of the flaring knife along the axial direction of the stator; Figure 4 As shown, initial positioning is performed, and at this time the flaring knife is higher than the end of the 6th layer of flat wire.

[0068] Step b2: Move the flaring knife along the axial direction of the stator so that the flaring hole covers the end of the sixth layer of flat wire and the flaring knife has no contact with the fifth layer of flat wire; Figure 5 As shown, the first sleeve action is performed to sleeve the sixth layer of flat wire using the expanded hole.

[0069] Step b3: Move the flaring knife inward along the radial direction of the stator so that the fifth and sixth layers of flat wires are both facing the flaring hole along the axial direction of the stator; position again.

[0070] Step b4: Move the flaring knife along the axial direction of the stator so that the flaring hole covers the ends of the 5th and 6th layers of flat wires, and the flaring knife has no contact with the 4th layer of flat wires; perform a second covering action, using the flaring hole to cover the ends of the 5th and 6th layers of flat wires.

[0071] Step b5: Move the flaring knife radially outwardly along the stator to create a gap between the 4th and 5th layers of flat wires; perform the first pulling action to create a gap between the 4th and 5th layers of flat wires to facilitate the downward movement of the flaring knife.

[0072] In some embodiments, the gap between the fourth and fifth layers of flat wires is not less than 1-3 mm at the maximum point in the radial direction of the stator, and is preferably 2 mm.

[0073] Step b6: Move the expansion knife along the axial direction of the stator to the expansion wire drawing position, so that the expansion hole covers the 5th and 6th layer flat wires; the expansion wire drawing positions of the 5th and 6th layers are pre-designed.

[0074] Step b7: Move the expanding knife radially outwardly of the stator to expand the wires, and complete the expansion of the fifth and sixth layers of flat wires.

[0075] Step S40: Enclose the 1st, 2nd, 3rd and 4th layers of flat wires and pull them outward for expansion. The third time to complete the expansion of 1-4 layers: First, the expansion knife moves inwards until the 1st layer of flat wires is in the middle of the expansion knife hole, and the 3rd layer of flat wires is in the expansion knife avoidance groove; then the expansion knife is moved axially until the 1st layer of flat wires is inserted into the expansion knife hole, the 3rd layer of flat wires is in the expansion knife avoidance groove, and the expansion knife and the 2nd layer of flat wires are not in axial contact; then the expansion knife moves outwards until a 2mm gap appears between the 2nd and 3rd layers; finally, the expansion knife moves axially to the flat wire expansion and expansion position, and the expansion knife moves outwards for expansion, completing the expansion of 1-2 layers and 3-4 layers. Specifically, it includes the following steps c1-c5. The final expanded structure is as follows Fig.10 shown.

[0076] Step c1: Move the flaring knife inward along the radial direction of the stator, so that the first layer of flat wires faces the center of the flaring hole of the flaring knife along the axial direction of the stator, and the third layer of flat wires faces the avoidance slot of the flaring along the axial direction of the stator. Figure 6 As shown, the initial positioning of the 1-4 layers of expansion is performed.

[0077] Step c2: Move the flaring knife along the axial direction of the stator, so that the flaring hole covers the end of the first layer of flat wires, the avoidance slot covers the third layer of flat wires, and the flaring knife has no contact with the second and fourth layers of flat wires; Figure 7 shown.

[0078] Step c3: Move the flaring knife radially outwardly of the stator to create a gap between the second and third layers of flat wires. Use the partition wall between the flaring hole 102 and the avoidance slot 103 to pull the end of the third layer of flat wires to create a gap between the second and third layers of flat wires to facilitate the downward movement of the flaring knife.

[0079] In some embodiments, the gap between the second layer and the third layer of flat wires is not less than 1-3 mm at the maximum point along the radial direction of the stator, and is preferably 2 mm.

[0080] Step c4: Move the flaring knife along the stator axis to the flaring wire pulling position, so that the flaring hole covers the 1st and 2nd layer flat wires, and the avoidance slot covers the 3rd and 4th layer flat wires. The wire pulling position of 1-4 layers of flaring is also given.

[0081] Step c5: Move the expanding knife radially outwardly of the stator to expand the flat wires, and complete the expansion of the first, second, third and fourth layers of flat wires.

[0082] In addition, this process method is applicable to the height of the flat wire ends of each layer extending out of the stator slots: the flat wire ends of the first layer are higher than those of the second layer, the flat wire ends of the third layer are higher than those of the second layer, the flat wire ends of the third layer are higher than those of the fourth layer, the flat wire ends of the fifth layer are higher than those of the fourth layer, the flat wire ends of the sixth layer are higher than those of the fifth layer, the flat wire ends of the sixth layer are higher than those of the seventh layer, and the flat wire ends of the eighth layer are higher than those of the seventh layer.

[0083] Optional, such as Figure 1 As shown, the height of the flat wire ends of each layer extending out of the stator slots is: the flat wire ends of the first layer are higher than those of the sixth layer, and the flat wire ends of the sixth layer are higher than those of the third layer; the flat wire ends of the third layer are higher than those of the first layer; the flat wire ends of the first layer are higher than those of the fifth layer; the flat wire ends of the fifth layer are higher than those of the seventh layer; the flat wire ends of the seventh layer are lower than those of the fourth layer; and the flat wire ends of the fourth layer are higher than those of the second layer.

[0084] In addition, the above step numbers are for the purpose of facilitating understanding and describing the process, rather than being a rigid requirement for the execution order.

[0085] Example 2

[0086] Figure 8 and Fig. 9 The present invention shows a control method of the above-mentioned flat wire stator expansion process method, including a tool body 101, the tool body 101 is in a long block shape, and a flaring hole 102 is provided at one end, and an avoidance slot 103 is provided on one side of the flaring hole 102.

[0087] In some embodiments, the cross section of the avoidance slot 103 is rectangular, and the long side of the cross section is along the length direction of the tool body 101; the bottom edge of the avoidance slot 103 on the side close to the stator is chamfered to facilitate the insertion of the flat wire.

[0088] In addition, in order to facilitate the insertion of the flat wire into the avoidance slot 103 for avoidance, the width of the avoidance slot is greater than the width of the flat wire, and the length is 10-14 times the thickness of the flat wire.

[0089] In some embodiments, the cross section of the expanded hole 102 is rectangular, and the wide side of the cross section is along the length direction of the tool body 101; the bottom edge of the expanded hole 102 close to the stator is chamfered to facilitate the insertion of the flat wire.

[0090] In addition, in order to achieve the proper arrangement of the two flat wires, the width of the expanded hole 102 is greater than twice the thickness of the flat wire 0.3-05 mm, and the length is greater than the width of the flat wire.

[0091] The cross-sections of the flared hole 102 and the avoidance slot 103 are both rectangular, and the center lines of the two coincide along the length direction of the tool body 101. Since the size of the flared hole 102 is greater than twice the thickness of the flat wire, the chamfered surface of the bottom edge can be set larger to facilitate the insertion of the flat wire.

[0092] like Figure 8 As shown, the mounting holes 104 are two countersunk holes, which are spaced apart along the length direction of the tool body 101 and are used to fix the flaring knife on the equipment.

[0093] In addition, the flared hole 102 and the avoidance slot 103 are arranged adjacent to each other, the thickness of the partition wall therebetween is 0.8-1.5 mm, and the thickness of the wall between the flared hole 102 and the end face of the tool body 101 is 0.8-1.5 mm.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A flat wire stator expansion process, characterized in that: The number of flat wire layers in each stator slot is 8. The method for expanding the 8 layers of flat wires in a stator slot includes: Push the 8th layer of flat wires from the outside along the radial direction of the stator to ensure that the 8 layers of flat wires are in close contact without bursting; Wrap the 7th and 8th layers of flat wires and pull them outward to expand; Wrap the 5th and 6th layers of flat wires and pull them outward to expand; Wrap the first, second, third and fourth layers of flat wires and pull them outwards to expand; Among them, the 8 layers of flat wires in the stator slots are the 1st layer to the 8th layer from the center of the stator to the outside.

2. A flat wire stator expansion process according to claim 1, characterized in that: The step of squeezing and pushing the eighth layer of flat wires from the outside along the radial direction of the stator so that the eight layers of flat wires are in close contact without being separated comprises: By moving the expanding knife along the radial direction of the stator, the end of the expanding knife is used to push the outer side of the end of the 8th layer of flat wire, so that the 8 layers of flat wires are in close contact without bursting.

3. A flat wire stator expansion process according to claim 1, characterized in that: The method of enclosing the seventh and eighth layers of flat wires and pulling the wires outward to expand the openings comprises: Move the flaring knife inward along the radial direction of the stator, so that the 8th layer of flat wire faces the center of the flaring hole of the flaring knife along the axial direction of the stator; Move the flaring knife along the axial direction of the stator, so that the flaring hole covers the end of the 8th layer of flat wire, and the bottom edge of the end of the flaring knife is lower than the top of the 6th layer of flat wire, and the flaring knife has no contact with the 7th layer of flat wire; Move the flaring knife inward along the radial direction of the stator, so that a gap appears between the 6th and 7th layers of flat wires, and the 7th and 8th layers of flat wires are both facing the flaring hole along the axial direction of the stator; Move the expansion knife along the stator axial direction to the expansion wire pulling position, so that the expansion hole covers the 7th layer flat wire and the 8th layer flat wire; The expanding knife moves radially outwardly along the stator to expand, completing the expansion of the 7th and 8th flat wire layers.

4. A flat wire stator expansion process according to claim 3, characterized in that: When the flaring knife is moved along the axial direction of the stator, the flaring hole covers the end of the 8th layer of flat wire, the bottom edge of the end of the flaring knife is lower than the top of the 6th layer of flat wire, and the flaring knife has no contact with the 7th layer of flat wire: The bottom edge of the end of the flaring knife is at least 2-4 mm below the top of the 6th layer of flat wire.

5. A flat wire stator expansion process according to claim 3, characterized in that: Move the flaring knife radially inwards of the stator so that a gap appears between the 6th and 7th layers of flat wires, and both the 7th and 8th layers of flat wires face the flaring hole along the axial direction of the stator: The maximum gap between the sixth layer of flat wires and the seventh layer of flat wires along the radial direction of the stator is not less than 1-3 mm.

6. A flat wire stator expansion process according to claim 1, characterized in that: The method of enclosing the fifth and sixth layers of flat wires and pulling the wires outward to expand the openings comprises: Move the flaring knife inward along the radial direction of the stator, so that the sixth layer of flat wire is aligned with the center of the flaring hole of the flaring knife along the axial direction of the stator; Move the flaring knife along the axial direction of the stator so that the flaring hole covers the end of the sixth layer of flat wire and the flaring knife has no contact with the fifth layer of flat wire; Move the flaring knife inward along the radial direction of the stator, so that the fifth and sixth layers of flat wires are both facing the flaring hole along the axial direction of the stator; Move the flaring knife along the axial direction of the stator so that the flaring hole covers the ends of the fifth and sixth layers of flat wires, and the flaring knife has no contact with the fourth layer of flat wires; Move the flaring knife radially outwards along the stator to create a gap between the 4th and 5th layers of flat wires; Move the expansion knife along the stator axial direction to the expansion wire pulling position, so that the expansion hole covers the fifth and sixth layers of flat wires; The expanding knife is moved radially outwardly along the stator to expand the wires, thereby completing the expansion of the fifth and sixth layers of flat wires.

7. A flat wire stator expansion process according to claim 6, characterized in that: The expanding knife is moved radially outwardly of the stator to form a gap between the 4th and 5th layers of flat wires; The gap between the 4th and 5th layers of flat wires is not less than 1-3 mm at the maximum point along the radial direction of the stator.

8. A flat wire stator expansion process according to claim 1, characterized in that: The method of enclosing the first layer, the second layer, the third layer and the fourth layer of flat wires and pulling the wires outward to expand the openings comprises: Move the expanding knife inward along the radial direction of the stator, so that the first layer of flat wires faces the center of the expanding hole of the expanding knife along the axial direction of the stator, and the third layer of flat wires faces the avoidance slot hole of the expansion along the axial direction of the stator; Move the flaring knife along the axial direction of the stator, so that the flaring hole covers the end of the first layer of flat wires, the avoidance slot hole covers the third layer of flat wires, and the flaring knife has no contact with the second and fourth layers of flat wires; Move the flaring knife radially outwards along the stator to create a gap between the second and third layers of flat wires; Move the expansion knife along the stator axial direction to the expansion wire pulling position, so that the expansion hole covers the first and second layers of flat wires, and the avoidance slot hole covers the third and fourth layers of flat wires; The expanding knife is moved radially outwardly of the stator to expand the flat wires, and the first, second, third and fourth layers of the flat wires are expanded.

9. A flat wire stator expansion process according to claim 8, characterized in that: The expanding knife is moved radially outwardly of the stator to form a gap between the second and third layers of flat wires; The gap between the second and third layers of flat wires is not less than 1-3 mm at the maximum point along the radial direction of the stator.

10. A flat wire stator expansion process according to claim 1, characterized in that: The height of the flat wire ends of each layer extending out of the stator slots: the flat wire ends of the first layer are higher than those of the second layer, the flat wire ends of the third layer are higher than those of the second layer, the flat wire ends of the third layer are higher than those of the fourth layer, the flat wire ends of the fifth layer are higher than those of the fourth layer, the flat wire ends of the sixth layer are higher than those of the fifth layer, the flat wire ends of the sixth layer are higher than those of the seventh layer, and the flat wire ends of the eighth layer are higher than those of the seventh layer.

11. A flat wire stator flaring knife, characterized in that: A flat wire stator expanding process method for implementing any one of claims 1 to 10, comprising a tool body (101), wherein the tool body (101) is in the shape of a long strip and has an expanding hole (102) at one end, and an avoidance slot (103) is provided on one side of the expanding hole (102).

12. A flat wire stator flaring knife according to claim 11, characterized in that: The cross section of the avoidance slot (103) is rectangular, and the long side of the cross section is along the length direction of the tool body (101); the bottom edge of the avoidance slot (103) on one side close to the stator is chamfered to facilitate the insertion of the flat wire.

13. The flat wire stator expanding knife according to claim 11, characterized in that: The expanded hole (102) has a rectangular cross section, with the wide side of the cross section along the length direction of the tool body (101); the bottom edge of the expanded hole (103) on one side close to the stator is chamfered to facilitate the insertion of the flat wire.

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