A roll developing device and a multi-layer iron core

Abstract

A punching and winding device and a multi-layer iron core are used for punching and winding a steel strip to form a multi-layer iron core. Among them, the multi-layer iron core includes a plurality of winding layers, and the steel strip includes a plurality of continuous parts; the device includes: a plurality of punching units, a transmission mechanism, a winding device, and a servo motor. The plurality of punching units are used for punching multiple types of punched holes, and each type of punched hole includes one shape or multiple sizes; the transmission mechanism is used to drive the plurality of punching units to form at least one type of punched hole in each part of the steel strip; the winding device is used to wind the punched steel strip to form a multi-layer iron core; the servo motor is used to control the punching speed of the transmission mechanism driving the plurality of punching units and the winding speed of the winding device, so that the same type of punched holes on multiple parts of the steel strip form a plurality of groove-shaped holes penetrating the multi-layer iron core after winding to form the multi-layer iron core. The embodiment of the present application can complete the production of the motor iron core with different groove shapes and multi-layer groove holes at one time without replacing the punching die, and the iron core made by this device has a high utilization rate of the magnetic pole arc of the magnet.

Description

Technical Field

[0001] This application relates to the technical field of disc motor manufacturing, and particularly to a punching and winding device and a multi-layer iron core. Background Art

[0002] One of the development directions of electric vehicles is multi-motorization, and the ultimate expected form is to independently drive each wheel to obtain the best power performance and handling performance. For this reason, more miniaturized drive motors have always been a hot demand in the industry. The axial flux motor (AFM), also known as the disc motor, is widely used in the field of electric vehicles due to its small structural volume. For the disc motor itself, its working magnetic flux is axial. Therefore, eddy currents will be generated in the plane perpendicular to the axial direction during the working process of the disc motor. In order to eliminate the adverse effects brought by the eddy currents, corresponding treatments need to be carried out in this plane to suppress the eddy current loop while minimizing the impact on its electromagnetic performance. The currently more mature technical means is to use an iron core made by winding as the stator. However, the magnetic steel pole arc utilization rate of the common wound iron core is relatively low, which affects the performance of the disc motor. Summary of the Invention

[0003] An embodiment of this application provides a punching and winding device and a multi-layer iron core, which can complete the production of a multi-layer iron core with different slot shapes and multi-layer slot holes at one time without replacing the mold. The multi-layer iron core made by this punching and winding device has a high magnetic steel pole arc utilization rate, which is beneficial to exert the performance of the disc motor.

[0004] In a first aspect, a punching and winding device is provided for punching and winding a steel strip to form a multi-layer iron core. The multi-layer iron core includes a plurality of winding layers, and the steel strip includes a plurality of continuous parts, including: a plurality of punching units, a transmission mechanism, a winding device, and a servo motor. The plurality of punching units are used for punching multiple types of punching holes, and each type of punching hole includes one shape or multiple sizes; the transmission mechanism is used to drive the plurality of punching units to form at least one type of punching hole in each part of the steel strip; the winding device is used to wind the punched steel strip to form a multi-layer iron core; the servo motor is used to control the punching speed of the transmission mechanism driving the plurality of punching units and the winding speed of the winding device, so that the same type of punching holes on the multiple parts of the steel strip form a plurality of slot holes penetrating the multi-layer iron core after winding to form the multi-layer iron core.

[0005] In an embodiment of this application, a plurality of punching units are provided in the punching and winding device. The structure and specifications of the punching units can be freely selected according to needs, and the specific working sequence of the punching units can also be set according to needs. The servo motor controls one or several punching units to work simultaneously, or the servo motor controls one or several punching units to work in a set sequence. Therefore, this punching and winding device can complete the production of a multi-layer iron core with different slot holes without replacing the punching mold at one time.

[0006] In a possible implementation, the shapes of multiple slot-shaped holes are the same as those of multiple types of punching holes, and the aperture diameters of the multiple slot-shaped holes decrease in the direction from the edge of the multi-layer iron core towards the center of the multi-layer iron core. The purpose is to make the shape formed by the combination of the multiple slot-shaped holes as close as possible to an ideal sector shape, maintaining an approximate pole arc coefficient from the inner circular surface to the outer circular surface, which is beneficial to exerting the electromagnetic performance of the multi-layer iron core.

[0007] In a possible implementation, a winding device is used to wind a part of a steel strip to form at least one winding layer of a multi-layer iron core.

[0008] In a possible implementation, one winding layer includes multiple punching holes of the same type, and the multiple punching holes of the same type have the same shape and the same size.

[0009] In a possible implementation, when two adjacent winding layers are formed by the same part of the steel strip, the sizes of the punching holes of the same type on the two adjacent winding layers are the same.

[0010] In a possible implementation, when a winding layer formed by one part of the steel strip and a winding layer formed by another part of the steel strip are adjacent, the sizes of the punching holes of the same type on the two adjacent winding layers are different.

[0011] In a possible implementation, in the adjacent winding layers of two adjacent parts, the size of the punching holes of the same type on the winding layer closer to the center of the circle of the multi-layer iron core is smaller than the size of the punching holes of the same type on the other winding layer.

[0012] In a possible implementation, a single punching unit among multiple punching units is used to punch the steel strip to form a type of punching hole.

[0013] In a possible implementation, at least two punching units among multiple punching units simultaneously punch the steel strip to form another type of punching hole, and the shape of one type of punching hole is the same as that of the other type of punching hole but the sizes are different.

[0014] In a possible implementation, at least two punching units among multiple punching units simultaneously punch the steel strip to form another type of punching hole, and the shape of one type of punching hole is different from that of the other type of punching hole and the sizes are also different.

[0015] On the other hand, a multi-layer iron core is proposed, and this multi-layer iron core is manufactured by the punching and winding equipment as described above. The variation range of the pole arc coefficient at the inner and outer circles of this multi-layer iron core is small, and the electromagnetic performance is stable.

[0016] In another aspect, a multi-layer iron core is proposed. The multi-layer iron core includes a plurality of winding layers formed by winding a steel strip. Among them, the steel strip includes a plurality of continuous parts. One part of the steel strip winds to form at least one winding layer of the multi-layer iron core. Each part of the steel strip includes at least one type of punched hole, and each type of punched hole includes one shape or multiple sizes. The punched holes of the same type on the multiple parts of the steel strip form a plurality of grooved holes penetrating the multi-layer iron core after winding to form the multi-layer iron core; the shapes of the plurality of grooved holes are the same as the shapes of the multiple types of punched holes, and the aperture diameters of the plurality of grooved holes decrease in the direction from the edge of the multi-layer iron core to the center of the multi-layer iron core.

[0017] In an embodiment of the present application, each part of the steel strip forms a part of the multi-layer iron core after winding. At least one type of punched hole is included on this part. The multi-layer iron core is composed of multiple parts. Among them, the multiple types of punched holes of the multiple parts are combined together to form a plurality of grooved holes penetrating the multi-layer iron core, and the sizes of the plurality of grooved holes decrease in sequence in the direction from the edge of the multi-layer iron core to the center of the multi-layer iron core. Therefore, at the grooved hole, the pole arc coefficient change from the inner circular surface to the outer circular surface is not large, the electromagnetic waveform is relatively stable, and it is more conducive to exerting the electromagnetic performance.

[0018] In a possible embodiment, when two winding layers formed by the same part of the steel strip are adjacent, the sizes of the punched holes of the same type on the adjacent two winding layers are the same.

[0019] In a possible embodiment, when a winding layer formed by one part of the steel strip and a winding layer formed by another part of the steel strip are adjacent, the sizes of the punched holes of the same type on the adjacent two winding layers are different.

[0020] In a possible embodiment, each grooved hole includes a first end face, a second end face, a third end face, a fourth end face, a fifth end face, and a sixth end face; the first end face is parallel to the second end face; the third end face is parallel to the fourth end face; the fifth end face and the sixth end face are arc-shaped surfaces. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the arrangement scheme of a sector-shaped groove, a straight groove, and a three-layer groove for the core of a disc motor;

[0022] Figure 2 It is a schematic structural diagram of a punching and winding device proposed in an embodiment of the present application;

[0023] Figure 3 It is a schematic diagram of the working state of a punching unit proposed in an embodiment of the present application;

[0024] Figure 4 It is another schematic diagram of the working state of a punching unit proposed in an embodiment of the present application;

[0025] Figure 5Schematic cross-sectional view of a partial punch die proposed in an embodiment of the present application;

[0026] Figure 6 Schematic structural view of a multi-layer iron core proposed in an embodiment of the present application;

[0027] Figure 7 Schematic internal structural view of a multi-layer iron core proposed in an embodiment of the present application;

[0028] Figure 8 Another schematic internal structural view of a multi-layer iron core proposed in an embodiment of the present application. Detailed implementation manners

[0029] Existing punching and coiling equipment for manufacturing the iron core of a disc motor usually only has one type of punching unit, and the iron core it manufactures only has one type of slot-shaped hole. If iron cores with multiple slot shapes need to be manufactured, the punching unit must be replaced, and the mold must be adjusted and trial-molded again. It is impossible to achieve the one-time punching and forming of iron cores with different slot shapes, which is time-consuming and laborious.

[0030] Figure 1 Schematic layout diagram of the fan-shaped slot, straight slot and three-layer slot for the iron core of a disc motor. Figure 1 Embodiments showing three different slot shapes applied to the iron core of a disc motor are respectively an embodiment using one slot shape, an embodiment using an ideal fan-shaped slot, and an embodiment using a multi-layer slot shape composed of three slot shapes. Among them, in the embodiment using the ideal fan-shaped slot, the pole arc coefficient from the inner circle to the outer circle of the iron core remains basically the same, approximately 1. This iron core with an ideal fan-shaped slot has excellent electromagnetic performance, but it is difficult to achieve in actual production. For the iron core made using one slot shape, the pole arc coefficient at the inner circle of the iron core is large, and the pole arc coefficient at the outer circle is small. It can be seen that the pole arc coefficient of this iron core changes greatly and its electromagnetic performance is average. For the iron core made using a multi-layer slot shape, the pole arc coefficient from the inner circle to the outer circle can be controlled within a very small fluctuation range, so that the electromagnetic performance of the iron core is maintained in a relatively excellent state. Since the pole arc coefficient indicates the proportion of the range that the permanent magnet can occupy in the iron core, in general motor design, the reasonable range of this coefficient should be between 0.8 and 0.95; therefore, in order to make the pole arc coefficient set more reasonably, the ideal slot shape should be a fan-shaped slot or a more ideal multi-layer slot, so that the inner and outer circles of the permanent magnet maintain an approximate pole arc coefficient, which is beneficial to exerting the performance of the disc motor.

[0031] The present application aims to propose equipment that can complete a multi-layer iron core with different slot-shaped holes at one time.

[0032] Figure 2 Schematic structural view of a punching and coiling equipment proposed in an embodiment of the present application. As Figure 2As shown in the figure, the roll stamping equipment includes a servo motor, a feeding device 1, a stamping device 2, and a winding device 3. The stamping device 2 is used for punching holes in the steel strip. The stamping device 2 may include a punch 4 and a die 5, and one punch 4 and one die 5 form a stamping unit. In this embodiment, the stamping device 2 includes a plurality of stamping units and a transmission mechanism. The plurality of stamping units are used for stamping multiple types of punched holes, and each type of punched hole includes one shape or multiple sizes; the transmission mechanism is used to drive the plurality of stamping units to form at least one type of punched hole in each part of the steel strip; the winding device is used for winding the stamped steel strip to form a multi-layer iron core; the servo motor is used to control the stamping speed of the transmission mechanism driving the plurality of stamping units and the winding speed of the winding device, so that the same type of punched holes in multiple parts of the steel strip form a plurality of grooved holes penetrating through the multi-layer iron core after being wound to form the multi-layer iron core.

[0033] In a further optional embodiment, the shapes of the plurality of grooved holes are the same as those of the multiple types of punched holes, and the diameters of the plurality of grooved holes decrease in the direction from the edge of the multi-layer iron core to the center of the multi-layer iron core. Each part of the steel strip forms a part of the multi-layer iron core after being wound, and at least one type of punched hole is included in this part. The multiple parts form the multi-layer iron core. Among them, the multiple types of punched holes in the multiple parts are combined together to form a plurality of grooved holes penetrating through the multi-layer iron core, and the sizes of the plurality of grooved holes decrease in sequence in the direction from the edge of the multi-layer iron core to the center of the multi-layer iron core. Therefore, at the grooved holes, the pole arc coefficient changes little from the inner circular surface to the outer circular surface, and the electromagnetic waveform is relatively stable, which is more conducive to exerting the electromagnetic performance.

[0034] In a further optional embodiment, the winding device 3 is used to wind a part of the steel strip to form at least one winding layer of the multi-layer iron core. One winding layer includes a plurality of the same type of punched holes, and the plurality of the same type of punched holes have the same shape and the same size.

[0035] In a further optional embodiment, when two adjacent winding layers formed by the same part of the steel strip are adjacent, the sizes of the same type of punched holes on the two adjacent winding layers are the same. When different parts of the steel strip are adjacent, that is, when the winding layer formed by one part of the steel strip and the winding layer formed by another part of the steel strip are adjacent, the sizes of the same type of punched holes on the two adjacent winding layers are different.

[0036] In a further optional embodiment, the size of the same type of punched holes on the winding layer closer to the center of the circle of the multi-layer iron core in the adjacent winding layers of two adjacent parts is smaller than the size of the same type of punched holes on the other winding layer. The purpose is to make the shape formed by combining the plurality of grooved holes as close as possible to an ideal sector shape, and maintain an approximate pole arc coefficient from the inner circular surface to the outer circular surface, which is beneficial to exerting the electromagnetic performance of the multi-layer iron core.

[0037] In a further optional embodiment, a single stamping unit among the plurality of stamping units is used for stamping the steel strip to form one type of punched hole.

[0038] In a further optional embodiment, at least two of the plurality of stamping units simultaneously stamp the steel strip to form another type of punched holes, where one type of punched holes has the same shape but different sizes from the other type of punched holes.

[0039] In a further optional embodiment, at least two of the plurality of stamping units simultaneously stamp the steel strip to form another type of punched holes, where one type of punched holes has different shapes and different sizes from the other type of punched holes.

[0040] When the stamping device 2 is used to punch the steel strip, the feeding device 1 is used to feed the steel strip to the stamping device 2, and the winding device 3 is used to wind the punched steel strip into a shape. Among them, the feeding device 1 and the winding device 3 can both adopt mature technologies (such as a tape reel and a winding reel) to achieve the functions of feeding and winding, and will not be described in detail. In the embodiments of the present application, a plurality of stamping units are provided in the punching and winding equipment. The structure and specifications of the stamping units can be freely selected according to needs, and the specific working sequence of the stamping units can also be set according to needs. One or several stamping units are controlled by a servo motor to work simultaneously, or one or several stamping units are controlled by a servo motor to work in a set sequence. Therefore, the punching and winding equipment can manufacture multi-layer iron cores with different groove-shaped holes without replacing the stamping die.

[0041] Figure 3 FIG. is a schematic diagram of the working state of a stamping unit proposed in the embodiments of the present application. As Figure 3 shown, the stamping device 2 includes: a servo motor 6, a plurality of stamping units (A, B, C), and a transmission mechanism 9; among them, the plurality of stamping units can have different structures; the transmission mechanism 9, according to the control of the servo motor 6, pushes the plurality of stamping units to punch the steel strip; among them, the plurality of stamping units (A, B, C) punch the steel strip together or in a set sequence under the control of the servo motor 6.

[0042] The plurality of stamping units are respectively connected to the transmission mechanism 9. The transmission mechanism 9 controls its actions through the servo motor 6 and drives the plurality of stamping units to complete the stamping action and punch the steel strip. The transmission mechanism 9 adopts mature technologies (such as the transmission mechanism of a numerically controlled machine tool), and can include a plurality of transmission pairs for realizing specific set actions, including but not limited to gear transmission pairs, belt transmission pairs, worm and worm gear transmission pairs, screw rod transmission pairs, etc. It should be noted that the transmission mechanism 9 at least includes a plurality of stamping unit mounting parts, and the mounting parts are detachably connected to the stamping units, and the number of the mounting parts is the same as the number of the stamping units. Among them, the plurality of mounting parts can adopt a standardized structure, and the connection structure with the stamping units also adopts a standardized structural method to improve the efficiency of replacing the stamping units.

[0043] The stamping device 2 may further include: an upper base 8 and multiple pairs of guide rails 10. The transmission mechanism 9 is disposed on the upper base 8; multiple pairs of guide rails 10 are respectively and fixedly disposed on the upper base 8; wherein, one punch 4 is movably connected to one pair of guide rails 10. The punches 4 are respectively connected to the guide rails 10 to form multiple independent punch 4 movement units, realizing the possibility of controlling multiple punches 4 to complete the stamping action according to a set sequence.

[0044] In one example, the upper base 8 may be a housing with at least one open side. The transmission mechanism 9 and multiple pairs of guide rails 10 are both disposed inside the upper base 8; wherein, there is a spacing between multiple pairs of guide rails 10. Disposing the transmission mechanism 9 and the guide rails 10 inside the upper base 8 is beneficial to protecting key transmission components from damage, such as the transmission mechanism 9 being shot and damaged by metal debris splashing generated during stamping.

[0045] Multiple pairs of guide rails 10 are disposed at the opening of the housing, and multiple pairs of guide rails 10 extend out of the housing. It should be noted that the distances by which multiple pairs of guide rails 10 extend out of the housing may be the same or different, and the structures and dimensions of multiple pairs of guide rails 10 may be the same or different. To achieve the standardization of the installation interface between the punch 4 and the guide rails 10, the distances extending out of the housing are the same, and the structures and dimensions of multiple pairs of guide rails 10 are the same.

[0046] In the embodiments of the present application, the structures of multiple stamping units may be the same or different, and can be selected according to specific circumstances. Multiple stamping units all operate under the control of the servo motor 6, and multiple stamping units can punch the steel strip together or in a set sequence according to the control.

[0047] In one example, the stamping unit includes: a punch 4 and a die 5. Among them, the punch 4 has a protruding portion for punching the steel strip, and one end away from the protruding portion is connected to the transmission mechanism 9; the die 5 has a groove, and there is a spacing between the groove and the protruding portion. The structure and the set position of the groove correspond to the protruding portion; the stamping action is that the punch 4 makes a reciprocating motion relative to the die 5 driven by the transmission mechanism 9. Among them, the protruding portion can freely reciprocate without contact in the groove, that is, the stamping action is completed.

[0048] The stamping device 2 may further include: a lower die base 7. Multiple dies 5 are disposed on the lower die base 7 for cooperating with multiple punches 4 to complete the stamping action; there is a spacing between the lower die base 7 and multiple punches 4. The lower die base 7 fixes multiple dies 5, enabling multiple dies 5 to have the same base, enhancing the stability of the dies 5.

[0049] In one example, the surface of the lower die base 7 where the die 5 is disposed coincides with the surface of the die 5 close to the punch 4.

[0050] Figure 4 This is another schematic diagram of the working state of the stamping unit proposed in the embodiments of the present application. As Figure 4As shown, the structures and specifications of multiple stamping units (A, B, C) can be freely selected according to needs, and the stamping units can also set their specific working sequences according to needs, control one or several stamping units to work simultaneously, and control one or several stamping units to work in a set sequence. Therefore, this coil stamping equipment can complete the production of motor cores with different groove shapes and multi-layer groove holes without replacing the die at one time.

[0051] Figure 5 Schematic cross-sectional view of a partial punch proposed in an embodiment of the present application. Combining Figure 5 , the cross-sectional shape of the punch 4 (i.e., the punch head) can be: a straight shape ( Figure 5 (a)), a V shape ( Figure 5 (b)), a double V shape ( Figure 5 (c)), a single-layer U shape ( Figure 5 (d)), a double-layer U shape ( Figure 5 (e)), a triple-layer U shape ( Figure 5 (f)), and a V + straight shape ( Figure 5 (g)), or a combination of one or more of them. It can be understood that the present application only gives the reference styles of the cross-sections of the partial punch 4 as described above, and the cross-sectional shape of the punch 4 is not limited to the above shapes, and can also be a variety of regular or irregular shapes and their combinations. Among them, in order to avoid wear between the punch 4 and the die 5, the punch 4 and the die 5 can be in clearance fit.

[0052] The present application also proposes a multi-layer iron core with high magnetic steel pole arc utilization rate, and this multi-layer iron core is made by the coil stamping equipment proposed in the present application.

[0053] Figure 6 Schematic structural view of a multi-layer iron core proposed in an embodiment of the present application. As Figure 6 shown, the multi-layer iron core includes a plurality of winding layers formed by winding a steel strip. Among them, the steel strip includes a plurality of continuous parts. One part of the steel strip winds to form at least one winding layer of a plurality of iron cores. Each part of the steel strip includes at least one type of punching hole. Each type of punching hole includes one shape or multiple sizes. The punching holes of the same type on multiple parts of the steel strip form a plurality of groove-shaped holes penetrating the multi-layer iron core after winding to form the multi-layer iron core; the shapes of the plurality of groove-shaped holes are the same as the shapes of the multiple types of punching holes, and the hole diameters of the plurality of groove-shaped holes decrease in the direction from the edge of the multi-layer iron core to the center of the multi-layer iron core.

[0054] In the embodiments of the present application, each part of the steel strip forms a part of a multi-layer iron core after winding, and at least one type of punching is included on this part. Multiple parts form a multi-layer iron core. Among them, multiple types of punchings of multiple parts are combined together to form multiple groove-shaped hole combinations 17 that penetrate the multi-layer iron core. Moreover, the sizes of the multiple groove-shaped hole combinations 17 gradually decrease in the direction from the edge of the multi-layer iron core towards the center of the multi-layer iron core. Therefore, at the groove-shaped hole combination 17, the pole arc coefficient changes little from the inner circular surface to the outer circular surface, and the electromagnetic waveform is relatively stable, which is more conducive to exerting the electromagnetic performance.

[0055] In a further optional embodiment, when two winding layers formed by the same part of the steel strip are adjacent, the sizes of the same type of punching on the two adjacent winding layers are the same.

[0056] In a further optional embodiment, when a winding layer formed by a part of the steel strip is adjacent to a winding layer formed by another part of the steel strip, the sizes of the same type of punching on the two adjacent winding layers are different.

[0057] In an example, the iron core is a ring with a thickness, including an inner circular surface and an outer circular surface. The iron core includes multiple groove-shaped hole combinations 17, and the multiple groove-shaped hole combinations 17 respectively penetrate from the outer circular surface towards the direction close to the center of the iron core to the inner circular surface. Among them, the multiple groove-shaped hole combinations 17 are distributed along the circumferential direction of the outer circular surface.

[0058] Figure 7 It is a schematic diagram of the internal structure of a multi-layer iron core proposed in the embodiments of the present application. Combining Figure 7 , the groove-shaped hole combination 17 includes multiple groove-shaped holes 18 with different sizes, and the multiple groove-shaped holes 18 are connected together. The multiple groove-shaped hole combinations 17 are distributed along the circumferential direction of the outer circular surface; the structures and sizes of the multiple groove-shaped hole combinations 17 can be the same or different. In an example, the structures and sizes of the multiple groove-shaped hole combinations 17 are the same, and the multiple groove-shaped hole combinations 17 are evenly distributed along the circumferential direction of the outer circular surface.

[0059] In the embodiments of the present application, the multi-layer iron core has multiple groove-shaped hole combinations 17. The shape of each groove-shaped hole combination 17 projected on the toroidal surface is close to a sector. Therefore, at the groove-shaped hole combination 17, the pole arc coefficient changes little from the inner circular surface to the outer circular surface, and the electromagnetic waveform is relatively stable. Compared with a single groove-shaped iron core with a large difference in pole arc coefficient between the inner and outer circles, it is more conducive to exerting the performance of the disc motor.

[0060] Each groove-shaped hole 18 includes a first end face 11, a second end face 12, a third end face 13, a fourth end face 14, a fifth end face 15, and a sixth end face 16; among them, the first end face 11 and the second end face 12 are parallel; the third end face 13 and the fourth end face 14 are parallel; the fifth end face 15 and the sixth end face 16 are arc surfaces.

[0061] In a further optional embodiment, the first end faces 11 of the plurality of slot-shaped holes 18 overlap, and the second end faces 12 of the plurality of slot-shaped holes 18 overlap.

[0062] In a further optional embodiment, the opening sizes of the plurality of slotted holes 18 in the direction from the inner circular surface to the outer circular surface are gradually increased. The purpose is to make the shape of the plurality of slotted hole combinations 17 as close as possible to an ideal fan shape, so that the core maintains a similar pole arc coefficient from the inner circular surface to the outer circular surface.

[0063] In a further optional embodiment, the geometric center lines of the multiple slotted holes 18 of the multiple slotted hole combinations 17 coincide with each other. The purpose is to make the distribution of the multiple slotted hole combinations 17 more reasonable and avoid interference.

[0064] Figure 8 This is another schematic diagram of the internal structure of the core proposed in the embodiment of the present application. Figure 8 As shown, the arrangement of the multiple slot holes 18 can be side-aligned or staggered at a certain distance from the geometric center line of the multiple slot holes 18, which can be achieved by controlling the punching position by a servo motor. The advantage of this is that the effect of arranging the permanent magnets obliquely can be achieved, so that the electromagnetic force fluctuation of the disc motor can be suppressed to a certain extent, and its performance can be optimized.

[0065] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A film developing device, characterized in that, The punching and winding device is used for punching and winding a steel strip to form a multi-layer iron core of a disc motor. The multi-layer iron core includes a plurality of winding layers. The steel strip includes a plurality of continuous parts, including: A plurality of punching units for punching multiple types of punched holes, and each type of punched hole includes one shape or multiple sizes; A transmission mechanism for driving the plurality of punching units to form at least one type of punched hole in each part of the steel strip; A winding device for winding the punched steel strip to form the multi-layer iron core; A servo motor for controlling the punching speed of the transmission mechanism driving the plurality of punching units and the winding speed of the winding device, so that the punched holes of the same type on the multiple parts of the steel strip form a plurality of grooved holes penetrating the multi-layer iron core after winding to form the multi-layer iron core; the shapes of the plurality of grooved holes are the same as those of the multiple types of punched holes, and the diameters of the plurality of grooved holes decrease in the direction from the edge of the multi-layer iron core to the center of the multi-layer iron core, so as to limit the pole arc coefficient of each winding layer of the multi-layer iron core within a preset range.

2. The roll film developing device according to claim 1, wherein The winding device is used for winding a part of the steel strip to form at least one winding layer of the multi-layer iron core.

3. The roll developing device according to claim 1 or 2, characterized in that, One winding layer includes a plurality of punched holes of the same type, and the plurality of punched holes of the same type have the same shape and the same size.

4. The film developing device according to any one of claims 1 to 3, characterized in that, When two adjacent winding layers are formed by the same part of the steel strip, the sizes of the punched holes of the same type on the two adjacent winding layers are the same.

5. The roll developing device according to any one of claims 1-3, characterized in that, When a winding layer formed by a part of the steel strip and a winding layer formed by another part of the steel strip are adjacent, the sizes of the punched holes of the same type on the two adjacent winding layers are different.

6. The roll developing device according to claim 5, wherein In the adjacent winding layers of the adjacent two parts, the size of the punched holes of the same type on the winding layer closer to the center of the circle of the multi-layer iron core is smaller than that on the other winding layer.

7. The film developing equipment according to any one of claims 1-6, characterized in that, A single punching unit among the plurality of punching units is used for punching the steel strip to form one type of punched hole.

8. The roll developing device according to claim 7, wherein At least two punching units among the plurality of punching units punch the steel strip simultaneously to form another type of punched hole, and the one type of punched hole and the another type of punched hole have the same shape but different sizes.

9. The roll developing device according to claim 7, wherein At least two punching units among the plurality of punching units punch the steel strip simultaneously to form another type of punched hole, and the one type of punched hole and the another type of punched hole have different shapes and different sizes.

10. A multi-layer iron core, characterized in that, The multi-layer iron core is made by the punching and winding device according to any one of claims 1-9.

11. A multi-layer iron core, characterized in that, The multi-layer iron core is applied to a disc motor. The multi-layer iron core includes: a plurality of winding layers formed by winding a steel strip; The steel strip includes a plurality of continuous parts. A part of the steel strip is wound to form at least one winding layer of the multi-layer iron core. Each part of the steel strip includes at least one type of punched hole, and each type of punched hole includes one shape or multiple sizes. The punched holes of the same type on the multiple parts of the steel strip form a plurality of grooved holes penetrating the multi-layer iron core after winding to form the multi-layer iron core; The shapes of the plurality of grooved holes are the same as those of the multiple types of punched holes, and the diameters of the plurality of grooved holes decrease in the direction from the edge of the multi-layer iron core to the center of the multi-layer iron core, so as to limit the pole arc coefficient of each winding layer of the multi-layer iron core within a preset range.

12. The multi-layer iron core according to claim 11, characterized in that, When two winding layers formed by the same part of the steel strip are adjacent, the sizes of the same type of punched holes on the two adjacent winding layers are the same.

13. The multi-layer iron core according to claim 11 or 12, characterized in that, When a winding layer formed by a part of the steel strip and a winding layer formed by another part of the steel strip are adjacent, the sizes of the same type of punched holes on the two adjacent winding layers are different.

14. The multi-layer iron core according to any one of claims 11-13, characterized in that, Each of the groove-shaped holes includes a first end face, a second end face, a third end face, a fourth end face, a fifth end face, and a sixth end face; The first end face is parallel to the second end face; The third end face is parallel to the fourth end face; The fifth end face and the sixth end face are arc-shaped surfaces.

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