Motor iron core winding equipment
By designing the motor core winding equipment and using heating and extrusion inclined surface technology, the dimensional deviation caused by low material utilization and bending stress in traditional core processing is solved, and an efficient and accurate core winding process is achieved.
Patent Information
- Application Number
- CN202510195615.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2020-10-14
- Publication Date
- 2025-06-17
AI Technical Summary
The material utilization rate in traditional iron core processing is low, and bending stress leads to dimensional deviation and yield rate of the winding process is difficult to guarantee.
A motor core winding device is designed, including a silicon steel reel, a guide wheel, a stamping assembly and a winding assembly. The heating assembly is heated on the side of the steel belt inlay groove to relieve bending stress, and the axial movement and winding of the core is achieved by extruding the inclined surface.
Improves material utilization, reduces bending stress, ensures continuous automation of the winding process, and improves the dimensional accuracy and performance reliability of the iron core.
Smart Images
Figure CN120165544A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of iron core manufacturing, and particularly to a winding device for an electric motor iron core. Background Art
[0002] The iron core of an electric motor is an important component of various electric motors and generators, and is a major part of the cost of the electric motor. Since electric motors account for a very high proportion in industrial production, if the material utilization rate and the finished product rate can be slightly improved in the production of the iron core, significant economic benefits can be brought.
[0003] In traditional iron core processing, the shape of the iron core sheet is punched on a plate, and then stacked and welded together. This method has a very low material utilization rate, and a large amount of material is wasted as scrap. In the prior art, more and more winding processes are used to manufacture iron cores. The raw material is a steel strip coil on which slot grooves have been punched. According to the different specifications, types and forms of the electric motor, the cross-sectional shape of the iron core is different. Therefore, the pre-punched steel coils are not universal. Moreover, in the prior art, direct cold bending is used, and the bending stress accumulates in the iron core and tends to open outwards. Although subsequent processes such as precision trimming and stress relief are used to eliminate dimensional deviations, the large bending stress directly affects the winding process, resulting in large dimensional deviations, and it is difficult to ensure the qualified rate of the winding process. Summary of the Invention
[0004] The purpose of the present invention is to provide a winding device for an electric motor iron core to solve the problems raised in the above background art.
[0005] To solve the above technical problems, the present invention provides the following technical solution: A winding device for an electric motor iron core winds a steel strip into an iron core. The winding device includes a silicon steel drum, a guide wheel, a stamping assembly, and a winding assembly. A rolled steel strip is placed on the silicon steel drum. One end of the steel strip is pulled out, bypasses the guide wheel, passes through the stamping assembly, and then reaches the winding assembly. The winding assembly winds the steel strip into a thin sheet spiral iron core. The guide wheel plays a role of guiding and supporting, and the stamping assembly punches slot grooves on the steel strip. The steel strip is directly processed by this winding device from an original coil into a cylindrical iron core, which is integrally manufactured, simple and fast.
[0006] Further, the winding assembly includes a winding cylinder, a driving pin wheel, a tray, and an extrusion inclined surface. The winding cylinder is vertically arranged and has a rotational drive at the bottom. The outer cylindrical surface of the winding cylinder is wound with an iron core. The driving pin wheel is detachably installed at the upper end of the winding cylinder. The driving pin wheel is provided with pins that can extend downward. The driving pin wheel is inserted downward into the slot of the iron core. The driving pin wheel pushes the iron core to rotate with the winding cylinder. The bottom of the iron core is supported on the tray. The tray can be pressed downward. The extrusion inclined surface is located at the position where the steel strip is wound into the iron core. The extrusion inclined surface presses the steel strip downward by a distance equal to the thickness of the steel strip. This structure is the specific structure of winding. When the steel strip is wound into the iron core, the iron core needs to move axially to make way for a thickness distance to facilitate the winding of the subsequent steel strip. By pressing down the iron core that has been wound into a column through the extrusion inclined surface, the winding process is the process of the axial movement of the iron core. There is no need for an additional axial movement drive for the iron core. The tray is pressed downward. After pressing down to a distance equal to the length of a complete iron core, the equipment is stopped, the steel strip is cut, and the edge closing and end face flattening processes are completed, and a semi-finished iron core can be obtained. Then, only the coil needs to be wound into the slot in the future.
[0007] Further, the tray includes a first plate, a ball, a second plate, and an upper top spring. The lower end of the upper top spring abuts on a base, and the upper end is installed with the second plate. The first plate is arranged above the second plate. A ball is padded between the first plate and the second plate. The first plate supports the iron core. The lower end face of the iron core needs to rotate and move downward. Therefore, if it directly contacts the spring, the spring will twist or there will be friction between the spring and the lower end face of the iron core. Therefore, through an intermediate transmission method, a ball is padded between the iron core and the spring. The first plate and the second plate on both sides of the ball are used as ball carriers, similar to the form of a thrust bearing.
[0008] Further, the driving pin wheel includes a wheel disc and a pin rod. The winding assembly further includes a cam block. The wheel disc is connected to the upper end of the winding cylinder. Through holes evenly distributed in a circle are arranged at the outer edge position of the wheel disc. The pin rods are vertically inserted into the through holes. The upper end of the pin rod is provided with a flat cap. A spring is arranged between the flat cap at the upper end of the pin rod and the upper surface of the wheel disc. The pin rod is pushed upward by the spring. The cam block is fixed directly above the wheel disc. The lower surface of the cam block is provided with a cam ring surface. The cam ring surface takes the axis of the winding cylinder as the axis. The cam ring surface is at a high position directly above the position where the steel strip is wound into the iron core. The cam ring surface has a downward convex part. The downward convex part of the cam ring surface pushes the pin rod downward. When the pin rod is pushed by the downward convex part of the cam ring surface above, it moves downward and is inserted into the slot of the iron core. It can be used as the transmission connection between the iron core and the winding cylinder to push the rotation of the iron core. The wheel disc and the iron core have the same rotational speed. Therefore, the positions of the slots and the circumferential positions of the pin rods correspond one by one. As long as the pin rod moves downward a certain distance, it can be inserted into the slot. The cam is fixed. The downward convex position of the cam ring surface on its lower surface depends on the position where the steel strip is wound. As long as it is far enough, ensuring that two to three pin rods are inserted into the slot can meet the transmission requirements, and there will be no circumferential slip between the iron core and the winding cylinder.
[0009] Furthermore, the winding device further includes a heating component, which heats the steel strip at the position to be wound around the iron core. The stress of the heated steel strip decreases when it is bent, which can reduce the force required for bending. Compared with the cold bending stress caused by direct cold bending, only temperature stress accumulates after the hot bending and cooling, and there is almost no bending stress.
[0010] Furthermore, the heating component heats one side of the wire groove of the steel strip. When the heating component only heats one side of the wire groove, the temperature of the steel strip decreases from the inside to the outside. Thus, during the subsequent cooling process when the steel strip is wound into an iron core to form a ring, the cooling amount of the inner ring is greater than that of the outer ring. As a result, the inner ring shrinks more microscopically. The release speed of the internal stress at high temperature is greater than that at low temperature. Therefore, when bending and winding under the temperature condition of ring splitting, the internal stress can be evenly distributed throughout the metal relatively quickly, and a small amount of the unreleased stress accumulates. The deformation trend caused by the bending stress is the outward expansion of the arc, and the deformation trend caused by the different shrinkage amounts due to the temperature difference between the inner and outer rings is the inward contraction of the arc. These two stress directions cancel each other out or cancel out most of each other. Thus, after cooling, the internal stress of the iron core is greatly reduced. With the reduction of the internal stress, the size is stable and the performance is reliable.
[0011] Furthermore, the heating component includes magnetic field blocks and a DC module. The magnetic field blocks are arranged in pairs and are respectively distributed on both sides of the steel strip in the thickness direction. The DC module applies direct current between two teeth of the wire groove. The direction is determined by the left-hand rule: the direction of the direct current between two teeth of the wire groove of the DC module is the direction of the four fingers, the magnetic induction line from the N pole to the S pole of the magnetic field block passes through the palm surface, and the thumb of the hand points to the wire groove of the steel strip. This structure heats the steel strip by means of electric heating. If only two contact points are found on the steel strip to apply voltage, the resistance heating method is uniform. However, in this application, the Hall effect is utilized to change the current conduction position through the magnetic field, so that the current only flows from one side of the current conduction surface. The current conducts along the side where the wire groove is located. The conduction path is the position where resistance generates heat. The heating component only heats one side of the wire groove. Microscopically, the resistance heating is the result of the friction between the electrons flowing and the surrounding atomic nuclei during the electron flow process. The speed of the directional flow of electrons, while the heat conduction inside the metal is caused by the heat movement transfer between atoms. Therefore, the heating speed caused by the directional flow of electrons is greater than the heat conduction speed, and thus a temperature difference can be created on the steel strip.
[0012] As an optimization, the DC module contacts the protrusion of the wire groove of the steel strip through a roller brush. There are two roller brushes at the anode and cathode positions respectively, which press against the steel strip from both sides in the thickness direction of the steel strip. The roller brush, as the anode and cathode of the DC module, contacts the steel strip. It is necessary to ensure sufficient contact and smooth movement of the steel strip.
[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: When passing through the stamping component, the present invention stamps out the slot grooves arranged in sequence. Then, when passing through the heating component, it can heat a local position on one side of the slot groove of the steel strip, reducing the upcoming bending stress at high temperature. Under the bending action, the local circular arc stress of the steel strip faces outward, while during the cooling process, the inner ring cools more, resulting in the cooling stress facing inward, greatly offsetting the internal stress. The winding size is accurate, the winding process is continuous and automatic, the production is fast, and the resulting scrap is only the metal of the slot groove stamped from the steel strip, with high raw material utilization rate; by utilizing the Hall effect, the current is conducted not uniformly along the length direction of the steel strip but shifted to one side, and the generation of resistive heat is concentrated on one side, enabling the establishment of a temperature difference on the steel strip at a speed much faster than the heat conduction of the metal. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a schematic diagram of the operation process of the present invention; Figure 2 is a schematic structural diagram of the winding component of the present invention; Figure 3 is a three-dimensional structural diagram of the upper part of the winding component of the present invention; Figure 4 is a schematic principle structural diagram of the driving pin wheel and the cam block of the present invention; Figure 5 is a temperature and stress analysis diagram of the local circular arc of the steel strip under the action of the present invention; Figure 6 is a schematic diagram of the local heating principle of the heating component of the present invention.
[0015] In the figures: 1 - silicon steel reel, 2 - guide wheel, 3 - stamping component, 4 - heating component, 41 - magnetic field block, 42 - DC module, 421 - roller brush, 5 - winding component, 51 - winding cylinder, 52 - driving pin wheel, 521 - wheel disc, 522 - pin rod, 53 - tray, 531 - first disc, 532 - ball, 533 - second disc, 534 - upper top spring, 54 - extrusion inclined plane, 6 - cam block, 61 - cam ring surface, 91 - steel strip, 92 - iron core. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0017] Please refer to Figure 1-6 , the present invention provides a technical solution: As Figure 1 shown, a winding device for a motor iron core winds a steel strip 91 into an iron core 92. The winding device includes a silicon steel drum 1, a guide wheel 2, a stamping assembly 3, and a winding assembly 5. A coiled steel strip 91 is placed on the silicon steel drum 1. One end of the steel strip 91 is pulled out, bypasses the guide wheel 2, passes through the stamping assembly 3, and then reaches the winding assembly 5. The winding assembly 5 winds the steel strip 91 into a thin sheet spiral iron core 92. The guide wheel 2 plays a role of guiding and supporting. The stamping assembly 3 punches out slot-embedding grooves on the steel strip 91. The steel strip is directly processed from an original coil into a cylindrical iron core by this winding device, with one-piece manufacturing, which is simple and fast.
[0018] As Figures 2-4 shown, the winding assembly 5 includes a winding cylinder 51, a driving pin wheel 52, a tray 53, and an extrusion inclined surface 54. The winding cylinder 51 is vertically arranged and has a rotational drive at the bottom. The outer cylindrical surface of the winding cylinder 51 winds the iron core. The driving pin wheel 52 is detachably installed at the upper end of the winding cylinder 51. The driving pin wheel 52 is provided with pins that can extend downward. The driving pin wheel 52 is inserted downward into the slot-embedding grooves of the iron core 92. The driving pin wheel 52 pushes the iron core 92 to rotate with the winding cylinder 51. The bottom of the iron core 92 is supported on the tray 53. The tray 53 can be pressed down. The extrusion inclined surface 54 is located at the position where the steel strip 91 is wound into the iron core 92. The extrusion inclined surface 54 presses the steel strip 91 downward by a distance equal to the thickness of the steel strip 91. This structure is the specific structure for winding. While the steel strip 91 is wound into the iron core 92, the iron core 92 needs to move axially to make way for a thickness distance to facilitate the winding of the subsequent steel strip 91. The already wound cylindrical iron core 92 is pressed down by the extrusion inclined surface 54. The winding process is the process of the axial movement of the iron core 92. There is no need for an additional axial movement drive for the iron core 92. The tray 53 is pressed down. After being pressed down by a distance equal to the length of a complete iron core, the device is stopped, the steel strip 91 is cut, and after finishing the edge closing and end face flattening processes, a semi-finished iron core can be obtained. Then, only a coil needs to be wound into the slot-embedding grooves later.
[0019] As Figure 2As shown in the figure, the tray 53 includes a first tray 531, balls 532, a second tray 533, and an upper spring 534. The lower end of the upper spring 534 abuts against a base, and the upper end is mounted with the second tray 533. The first tray 531 is arranged above the second tray 533, and balls 532 are placed between the first tray 531 and the second tray 533. The first tray 531 supports the iron core 92. The lower end surface of the iron core 92 needs to rotate and move downward. Therefore, if it directly contacts the spring, the spring will be twisted or there will be friction between the spring and the lower end surface of the iron core 92. Therefore, through an intermediate transmission method, balls 532 are placed between the iron core 92 and the spring. The first tray 531 and the second tray 533 on both the upper and lower sides of the balls 532 serve as carriers for the balls 532, similar to the form of a thrust bearing.
[0020] The drive pin wheel 52 includes a wheel disc 521 and a pin rod 522. The winding assembly 5 further includes a cam block 6. The wheel disc 521 is connected to the upper end of the winding cylinder 51. Through holes evenly distributed in a circle are arranged at the outer edge position of the wheel disc 521, and the pin rods 522 are vertically inserted into the through holes. The upper ends of the pin rods 522 are provided with flat caps. A spring is arranged between the flat caps at the upper ends of the pin rods 522 and the upper surface of the wheel disc 521. The pin rods 522 are pushed upward by the spring. The cam block 6 is fixed directly above the wheel disc 521. A cam ring surface 61 is arranged on the lower surface of the cam block 6. The cam ring surface 61 takes the axis of the winding cylinder 51 as the axis. The cam ring surface 61 is at a high position directly above the position where the steel strip 91 is wound into the iron core 92. The cam ring surface 61 has a downward convex part, and the downward convex part of the cam ring surface 61 pushes the pin rod 522 downward. When the pin rod 522 is pushed by the downward convex part of the upper cam ring surface 61, it moves downward and is inserted into the slot of the iron core 92, which can serve as a transmission connection between the iron core 92 and the winding cylinder 51 to drive the rotation of the iron core 92. The wheel disc 521 and the iron core 92 have the same rotational speed. Therefore, the positions of the slots are in one-to-one correspondence with the circumferential positions of the pin rods 522. As long as the pin rod 522 moves downward by a certain distance, it can be inserted into the slot. The cam 6 is fixed, and the downward convex position of the cam ring surface 61 on its lower surface depends on the winding position of the steel strip 91. As long as it is far enough, ensuring that two to three pin rods 522 are inserted into the slots can meet the transmission requirement, and there will be no circumferential slip between the iron core 92 and the winding cylinder 51.
[0021] As Figure 1 shown, the winding equipment further includes a heating component 4, and the heating component 4 heats the steel strip 91 at the position where it is to be wound into the iron core 92. After the heated steel strip 91 is bent, the stress is reduced, which can reduce the force required for bending. Compared with the cold bending stress caused by direct cold bending, only temperature stress accumulates after hot bending and cooling, and there is almost no bending stress.
[0022] The heating component 4 heats one side of the slot of the steel strip 91. As Figure 5As shown in the figure, on one side of the heating component 4, only the wire embedding grooves are heated, so that the temperature of the steel strip 91 decreases from the inside to the outside, T1>T2>T3. Thus, during the cooling process after the steel strip 91 is wound into the iron core 92 to form a ring, the cooling amount of the inner ring is greater than that of the outer ring. As a result, the inner ring shrinks more microscopically, and the release speed of the internal stress at high temperature is greater than that at low temperature. Therefore, when bending and winding under the temperature condition of splitting the ring, the internal stress can be evenly distributed throughout the metal relatively quickly, and a small amount of the unreleased stress accumulates. The deformation trend caused by the bending stress is that the arc expands outward, and the deformation trend caused by the different shrinkage amounts due to the temperature difference between the inner and outer rings is that the arc shrinks inward. These two stress directions cancel each other out or cancel out most of each other. Thus, after cooling, the internal stress of the iron core 92 is greatly reduced. With the reduction of the internal stress, the size is stable and the performance is reliable.
[0023] As Figure 6 shown in the figure, the heating component 4 includes a magnetic field block 41 and a DC module 42. The magnetic field blocks 41 are arranged in pairs and are respectively distributed on both sides of the steel strip 91 in the thickness direction. The DC module 42 applies direct current between the teeth of the two wire embedding grooves. The direction is determined by the left-hand rule: the direction of the direct current between the teeth of the two wire embedding grooves of the DC module 42 is the direction of the four fingers, the magnetic induction line from the N pole to the S pole of the magnetic field block 41 passes through the palm surface, and the thumb of the hand points to the wire embedding groove of the steel strip 91. In this structure, the steel strip is heated by electric heating. If only two contact points are found on the steel strip to apply voltage, the resistance heating method is uniform. However, in this application, the Hall effect is utilized to change the current conduction position through the magnetic field, so that the current only flows from one side of the current conduction surface. Specifically, refer to Figure 6 , the magnetic induction line is from top to bottom, then the horizontally advancing current will shift to the left, and the current conducts along the side where the wire embedding groove is located. The conduction path is the position where resistance generates heat. The heating component 4 only heats one side of the wire embedding groove. Resistance generating heat is microscopically the result of the friction between the electrons flowing in the process and the surrounding atomic nuclei, the directional flow speed of the electrons, and the heat conduction inside the metal is caused by the heat movement transfer between atoms. Therefore, the heating speed caused by the directional flow of electrons is greater than the heat conduction speed, and thus a temperature difference can be created on the steel strip 91.
[0024] The DC module 42 contacts the protrusions of the wire embedding groove of the steel strip 91 through the roller brush 421. There are two roller brushes 421 at the anode and cathode positions respectively, and they press against the steel strip 91 from both sides in the thickness direction of the steel strip 91. The roller brush 421 serves as the anode and cathode of the DC module 42 to contact the steel strip 91, ensuring both sufficient contact and smooth movement of the steel strip 91.
[0025] Working principle of the present invention: The steel strip 91 comes out from the silicon steel reel 1 and is punched with sequentially arranged embedding grooves when passing through the stamping assembly 3. Then, when passing through the heating assembly 4, the local position on one side of the embedding groove of the steel strip 91 can be heated to reduce the upcoming bending stress at high temperature. Under the bending action, the local circular arc stress of the steel strip 91 faces outward, while during the cooling process, the inner ring cools more, resulting in the cooling stress facing inward, greatly offsetting the internal stress and making the rolling dimension accurate. Then, the pressing plate inclined surface 54 presses the steel strip 91 to move it down by a distance, and the newly entered steel strip 91 cooperates with the pressing plate inclined surface 54 to continuously press the already formed iron core 92, and the tray 53 supports the iron core 92.
[0026] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such process, method, article or device.
[0027] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A motor core winding device, which is used to wind a steel strip (91) into a core (92), and is characterized in that: The winding device includes a silicon steel drum (1), a guide wheel (2), a stamping assembly (3), and a winding assembly (5). A coiled steel strip (91) is placed on the silicon steel drum (1). One end of the steel strip (91) is pulled out, bypasses the guide wheel (2), passes through the stamping assembly (3), and then reaches the winding assembly (5). The winding assembly (5) winds the steel strip (91) into a thin sheet spiral-shaped iron core (92). The guide wheel (2) plays a role of guiding and supporting. The stamping assembly (3) punches slot embedding grooves on the steel strip (91). The winding assembly (5) includes a winding cylinder (51), a driving pin wheel (52), a tray (53), and an extrusion inclined surface (54). The winding cylinder (51) is vertically arranged and has a rotary driving component at its bottom. The outer cylindrical surface of the winding cylinder (51) is wound with the iron core. The driving pin wheel (52) is detachably installed at the upper end of the winding cylinder (51). The driving pin wheel (52) has pins that can extend downward. The driving pin wheel (52) is inserted downward into the slot embedding grooves of the iron core (92). The driving pin wheel (52) pushes the iron core (92) to rotate with the winding cylinder (51). The bottom of the iron core (92) is borne on the tray (53). The tray (53) can be pressed downward. The extrusion inclined surface (54) is located at the position where the steel strip (91) is wound into the iron core (92). The extrusion inclined surface (54) presses the steel strip (91) downward by a distance equal to the thickness of the steel strip (91). The tray (53) includes a first tray (531), balls (532), a second tray (533), and an upward pushing spring (534). The lower end of the upward pushing spring (534) abuts on a base, and the upper end is installed on the second tray (533). The first tray (531) is arranged above the second tray (533). Balls (532) are padded between the first tray (531) and the second tray (533). The first tray (531) supports the iron core (92). The driving pin wheel (52) includes a wheel disc (521) and a pin rod (522). The winding assembly (5) further includes a cam block (6). The wheel disc (521) is connected to the upper end of the winding cylinder (51). Through holes are circumferentially and evenly arranged at the outer edge position of the wheel disc (521). The pin rod (522) is vertically inserted into the through holes. The upper end of the pin rod (522) has a flat cap. A spring is arranged between the flat cap at the upper end of the pin rod (522) and the upper surface of the wheel disc (521). The pin rod (522) is pushed upward by the spring. The cam block (6) is fixed directly above the wheel disc (521). The lower surface of the cam block (6) has a cam ring surface (61). The cam ring surface (61) takes the axis of the winding cylinder (51) as the axis. The cam ring surface (61) is at a high position directly above the position where the steel strip (91) is wound into the iron core (92). The cam ring surface (61) has a downward convex part. The downward convex part of the cam ring surface (61) pushes the pin rod (522) downward. The winding device further includes a heating assembly (4). The heating assembly (4) heats the steel strip (91) at the position where it is to be wound into the iron core (92). The heating assembly (4) is arranged on one side of the slot embedding groove of the heating steel strip (91). When the pin rod (522) is pushed downward by the lower convex part of the upper cam ring surface (61), it moves downward and is inserted into the slot of the iron core (92) to serve as the transmission connection between the iron core (92) and the winding cylinder (51), promoting the rotation of the iron core (92). The disc (521) and the iron core (92) have the same rotational speed; the heating component (4) only heats one side of the slot, and the temperature of the steel strip (91) decreases from the inside to the outside.
2. The motor core winding device according to claim 1, characterized in that: The heating component (4) includes a magnetic field block (41) and a DC module (42). The magnetic field blocks (41) are arranged in pairs and are respectively distributed on both sides in the thickness direction of the steel strip (91). The DC module (42) applies direct current between the teeth of the two slots.
3. The motor core winding device according to claim 2, characterized in that: The DC module (42) contacts the protrusion of the slot of the steel strip (91) through a roller brush (421). There are two roller brushes (421) at the anode and cathode positions respectively, and they press against the steel strip (91) from both sides in the thickness direction of the steel strip (91).