Internal drive type electromagnetic drum and electromagnetic drum heat dissipation method

Abstract

The application relates to an inner driving type electromagnetic drum and an electromagnetic drum heat dissipation method, the inner driving type electromagnetic drum comprising a center shaft, a drum, a permanent magnet, a stator core, a coil, a fan rotatably mounted on the center shaft and a transmission assembly, the stator core, the coil and the fan being located in the drum, the stator core having a center hole, and a cavity being formed between the inner wall of the center hole of the stator core and the center shaft and communicating with both ends of the stator core, the fan being located at one end of the center hole, the fan blade of the fan facing the center hole, and the drum being connected with the fan through the transmission assembly to drive the fan to rotate. The inner driving type electromagnetic drum and the electromagnetic drum heat dissipation method have the advantages that the electromagnetic drum is simple in structure, convenient to use and good in heat dissipation effect.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic roller technology, and in particular to an internally driven electromagnetic roller and a method for cooling the electromagnetic roller, which can be applied to industries such as petroleum, mining, and metallurgical steel rolling. Background Technology

[0002] Electromagnetic rollers offer advantages such as simple structure, reliable operation, low loss, high efficiency, and direct drive control, making them particularly suitable for low-speed, high-torque applications. Therefore, they are widely used in industries such as petroleum, mining, and metallurgical steel rolling. However, during operation, the coils mounted on the stator of an external rotor electromagnetic roller generate a significant amount of induced heat, which can easily lead to motor aging and affect the roller's lifespan. External rotor electromagnetic rollers primarily rely on internal cooling water channels within the stator, connected to an external water cooler or source, resulting in a limited cooling method and a limited heat dissipation area.

[0003] To address this issue, patent document CN211405758U discloses an air-cooled external rotor electromagnetic drum, comprising a cooling fan, a fan shroud, a mounting base, an end cover assembly, a rotor assembly, a stator assembly, and a junction box. The mounting base has evenly distributed air duct openings, and the inner ring of the bearing housing of the stator assembly has evenly distributed inlet and outlet air vents corresponding to these air duct openings. The stator assembly has ventilation channels located outside the shaft, and the winding ends of the stator windings are equipped with platinum resistance thermometers to measure the temperature of the winding ends. This device, by employing an external cooling fan and using the inner ring of the bearing housing directly as the air inlet, achieves a large airflow while reducing airflow resistance, thus improving its heat dissipation effect, making it particularly suitable for low-speed, high-torque electromagnetic drums.

[0004] Although the above structure can achieve heat dissipation of the electromagnetic drum, it achieves heat dissipation by connecting an external fan and setting up an air duct, which has the disadvantages of complex structure and inconvenient use. Summary of the Invention

[0005] The purpose of this invention is to provide an internally driven electromagnetic roller, which has the advantages of simple structure, convenient use, and good heat dissipation.

[0006] To achieve the above objectives, the present invention provides an internally driven electromagnetic roller, comprising a central shaft, a roller rotatably mounted on the central shaft, a permanent magnet fixedly mounted on the roller, a stator core fixedly mounted on the central shaft, a coil fixedly mounted on the stator core, a fan rotatably mounted on the central shaft, and a transmission assembly. The stator core, coil, and fan are located inside the roller. The stator core has a central hole, and a cavity connecting the two ends of the stator core is formed between the inner wall of the central hole and the central shaft. The fan is located at one end of the central hole, with the fan blades facing the central hole. The roller is connected to the fan via the transmission assembly to drive the fan to rotate.

[0007] Preferably, the transmission assembly includes an internal gear ring fixedly mounted on the roller, a sun disk fixedly mounted on the central shaft, planetary gears rotatably mounted on the sun disk, and a gear fixedly mounted on the fan. The gear meshes with the planetary gears, and the planetary gears mesh with the internal gear ring. When the roller drives the internal gear ring to rotate, the internal gear ring drives the planetary gears to rotate, and the rotating planetary gears drive the gears to rotate, thereby driving the fan to rotate.

[0008] Preferably, an auxiliary rib is fixedly installed on the central shaft, the auxiliary rib is arranged along the axial direction of the central shaft, the stator core is fixed on the central shaft by the auxiliary rib, and the auxiliary rib is fixedly connected to the central hole wall of the stator core.

[0009] Preferably, there are multiple auxiliary ribs, and the multiple auxiliary ribs are evenly distributed around the central axis.

[0010] Preferably, the auxiliary rib is provided with a through hole connecting both sides of the auxiliary rib.

[0011] Preferably, the fan is mounted on the central shaft via a bearing, the fan blades are located at the end of the fan closer to the stator core, and the gear is located at the end of the fan farther from the stator core.

[0012] Preferably, the roller includes a roller body, a first end cover fixedly installed at one end of the roller body, and a second end cover fixedly installed at the other end of the roller body. Both the first end cover and the second end cover are mounted on the central shaft via bearings, and the internal gear ring is welded to the inner wall of the roller body.

[0013] The difference between this invention and existing technologies lies in the fact that the internally driven electromagnetic roller provided by this invention uses a fan mounted on the central shaft inside the roller. The roller's own rotation drives the fan, which faces the central hole of the stator core. This allows the airflow generated by the fan to pass through the cavity at the central hole, creating airflow within the sealed roller. The flowing air carries away the heat generated by the coil and the heat accumulated in the cavity, exchanging heat with other parts of the electromagnetic roller, thus achieving effective heat dissipation. This device utilizes the roller's own rotation to drive the built-in cooling fan, eliminating the need for an additional drive system. This improves the overall sealing of the roller, and the cooling fan effectively solves the problem of high roller temperature caused by limited heat dissipation area and ineffective heat dissipation, eliminating the need for an external cooling fan. Therefore, the internally driven electromagnetic roller provided by this invention has the advantages of simple structure, ease of use, and good heat dissipation.

[0014] Another objective of this invention is to provide an electromagnetic roller heat dissipation method that can improve the heat dissipation effect of the electromagnetic roller.

[0015] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0016] An electromagnetic drum heat dissipation method includes:

[0017] A fan is installed in the space between the drum and the central shaft of the electromagnetic drum;

[0018] A cavity is formed between the stator core and the central shaft;

[0019] The rotating drum drives the fan to rotate, causing air inside the drum to flow through the cavity and circulate within the drum.

[0020] Preferably, the fan rotates at a speed greater than the drum rotates at a speed greater than the drum rotation speed.

[0021] Preferably, the rotating roller drives the fan to rotate, comprising:

[0022] An internal gear ring is fixed on the roller, a sun disk is fixedly mounted on the central shaft, a planetary gear is rotatably mounted on the sun disk, and a gear is fixedly mounted on the fan. The gear meshes with the planetary gear, and the planetary gear meshes with the internal gear ring. When the roller drives the internal gear ring to rotate, the internal gear ring drives the planetary gear to rotate, and the rotating planetary gear drives the gear to rotate, thereby driving the fan to rotate.

[0023] The electromagnetic drum heat dissipation method provided by the present invention sets a fan inside the drum of the electromagnetic drum and uses the drum to drive the fan to rotate, so that the air inside the drum flows through the cavity between the stator core and the central shaft and flows inside the drum, carrying away the heat accumulated in the cavity. Therefore, no additional drive system is required, which is beneficial to the overall sealing of the drum. Moreover, it effectively solves the problem of high drum temperature caused by limited heat dissipation area and inability to effectively dissipate heat. Attached Figure Description

[0024] The above and other objects, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0025] Figure 1 This is a cross-sectional view of an internally driven electromagnetic roller according to one embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A schematic diagram of the central shaft of the internal drive electromagnetic drum and the fan and transmission assembly mounted on it.

[0027] Figure 3 yes Figure 2 The main view;

[0028] Figure 4 yes Figure 1 A schematic diagram of the central shaft of the internal drive electromagnetic roller is shown.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-Central shaft; 2-Drum; 21-Drum body; 22-First end cover; 23-Second end cover; 3-Permanent magnet; 4-Stator core; 41-Central hole; 5-Coil; 6-Fan; 7-Auxiliary rib; 71-Through hole; 81-Internal gear ring; 82-Sun disk; 83-Planetary gear; 84-Gear. Detailed Implementation

[0031] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0032] The specific embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0033] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "linked" should be interpreted broadly. For example, the term "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] In this invention, certain directional terms are defined. Unless otherwise stated, the directional terms such as "front" and "rear" refer to the internal drive electromagnetic roller provided by this invention under normal use conditions, and are consistent with the attached... Figure 1 The left and right directions shown are consistent. "Inner" and "outer" refer to the inner and outer sides relative to the outline of each component itself. These directional terms are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this invention.

[0035] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0036] Appropriate reference Figure 1 As shown, the internal drive type electromagnetic roller provided by the basic embodiment of the present invention includes a central shaft 1, a roller 2 rotatably mounted on the central shaft 1, a permanent magnet 3 fixedly mounted on the roller 2, a stator core 4 fixedly mounted on the central shaft 1, a coil 5 fixedly mounted on the stator core 4, a fan 6 rotatably mounted on the central shaft 1, and a transmission assembly.

[0037] like Figure 1 As shown, the roller 2 may include a roller body 21, a first end cover 22 fixedly installed at one end (front end) of the roller body 21, and a second end cover 23 fixedly installed at the other end (rear end) of the roller body 21. Both the first end cover 22 and the second end cover 23 are mounted on the central shaft 1 via bearings. The permanent magnet 3 is fixedly installed on the inner wall of the roller body 21. The stator core 4, coil 5, and fan 6 are located inside the roller 2, that is, the stator core 4, coil 5, and fan 6 are all installed in the space between the roller 2 and the central shaft 1.

[0038] like Figure 1 As shown, the stator core 4 has a central hole 41, and the inner wall of the central hole 41 of the stator core 4 has a cavity connecting the two ends of the stator core 4 between the central shaft 1. The fan 6 is located at one end of the central hole 41, and the fan blades of the fan 6 face the central hole 41. The roller 2 is connected to the fan 6 through the transmission assembly to drive the fan 6 to rotate.

[0039] In the above-described embodiment, the internally driven electromagnetic roller, when in use, has its coil 5, fixedly mounted on the stator core 4, energized to generate a magnetic field. This magnetic field drives the roller 2, on which the permanent magnet 3 is mounted, to rotate slowly on the central shaft 1, and also drives the fan 6 to rotate. The fan 6 faces the central hole of the stator core 4, and the airflow generated by the fan 6 can flow through the cavity at the central hole 41, creating airflow within the sealed roller 2. The flowing air carries away the heat generated by the coil 5 and the heat accumulated in the cavity, and exchanges heat with other parts of the electromagnetic roller, thereby achieving effective heat dissipation of the electromagnetic roller. This device utilizes the rotation of the roller itself to drive the built-in cooling fan 6, eliminating the need for an additional drive system. This is beneficial to the overall sealing of the roller, and the cooling fan 6 effectively solves the problem of high roller temperature caused by limited heat dissipation area and ineffective heat dissipation.

[0040] In embodiments of the present invention, the transmission assembly can employ various suitable transmission assemblies. To achieve better heat dissipation in the electromagnetic roller, in a preferred embodiment, such as... Figures 1 to 3 As shown, the transmission assembly includes an internal gear ring 81 fixedly mounted on the roller 2, a sun disk 82 fixedly mounted on the central shaft 1, a planetary gear 83 rotatably mounted on the sun disk 82, and a gear 84 fixedly mounted on the fan 6. The gear 84 meshes with the planetary gear 83, and the planetary gear 83 meshes with the internal gear ring 81.

[0041] The internal gear ring 81 can be fixed to the roller 2 in various ways, such as by bolts or other connecting parts. In this invention, preferably, the internal gear ring 81 is welded to the inner wall of the roller body 21, so that bolts or other connecting parts are not required. Therefore, it can avoid the situation where screws or other parts fall off during the operation of the electromagnetic roller, which would affect the operation.

[0042] The sun disk 82 is fixedly mounted on the central shaft 1. Specifically, the sun disk 82 can be fixed on the central shaft 1 by providing components such as a shoulder, a retaining ring, or a key. The sun disk 82 can be disc-shaped or a frame structure, as long as it allows for the mounting of the planetary gears 83. The planetary gears 83 can be mounted on the portion of the sun disk 82 extending towards the internal gear ring 81 via bearings. Multiple planetary gears 83 can be mounted on the sun disk 82. For better transmission efficiency, preferably, there are three planetary gears 83, evenly distributed around the axis of the internal gear ring 81.

[0043] The fan 6 may include an annular fan base and fan blades fixed on the fan base. The fan 6 can be rotatably connected to the central shaft 1 in various ways. Preferably, the fan base is rotatably mounted on the central shaft 1 via bearings. The fan 6 can be a large-sized fan. The gear 84 is fixedly mounted on the fan base, and the gear 84 and the fan base can be an integral structure. The gear 84 meshes with the planetary gear 83, and the planetary gear 83 meshes with the internal gear ring 81. That is, the planetary gear 83 is located between the internal gear ring 81 and the gear 84, and the gear 84 is connected to the internal gear ring 81 via the planetary gear 83.

[0044] This invention uses an internal gear ring 81, planetary gears 83, and gears 84 to form a differential disc. When the roller 2 drives the internal gear ring 81 to rotate, the internal gear ring 81 drives the planetary gears 83 to rotate, and the rotating planetary gears 83 drive the gears 84 to rotate, thereby driving the fan 6 to rotate. Since the planetary gears 83 are located inside and mesh with the internal gear ring 81, and the number of teeth on the internal gear ring 81 is much greater than the number of teeth on the planetary gears 83 and gears 84, when the internal gear ring 81 of the differential disc rotates once under the drive of the roller 2, the fan 6, which is equipped with gears 84, can rotate multiple times. This allows the differential disc to accelerate the rotation of the fan and improve the heat dissipation effect of the electromagnetic roller.

[0045] In this invention, the stator core 4 can be fixed to the central shaft 1 in various ways, such as... Figures 2-4 As shown, preferably, an auxiliary rib 7 is fixedly installed on the central shaft 1. The auxiliary rib 7 is arranged along the axial direction of the central shaft 1, and the stator core 4 is fixed to the central shaft 1 by the auxiliary rib 7. The auxiliary rib 7 is fixedly connected to the wall of the central hole 41 of the stator core 4. By providing an auxiliary rib arranged along the axial direction of the central shaft 1, the cavity can be divided into several parts without hindering the airflow in the cavity between the central shaft 1 and the stator core 4, and the air in the divided parts of the cavity can have a faster flow speed, thereby improving the heat dissipation capacity of the electromagnetic roller.

[0046] In the above embodiment, the number of auxiliary ribs 7 can be multiple, and the multiple auxiliary ribs 7 are evenly distributed around the central axis 1. Preferably, as shown in the figure... Figure 2 As shown, the number of auxiliary reinforcing bars 7 is 3.

[0047] In this invention, more preferably, such as Figures 2-4 As shown, the auxiliary rib 7 is provided with through holes 71 connecting both sides of the auxiliary rib 7. By providing through holes 71 on the auxiliary rib 7, the air flowing inside the cavity can be disturbed, thereby further improving the heat dissipation effect. Preferably, the through hole 71 is an elliptical hole, which is inclined.

[0048] like Figure 1 As shown, in this invention, the fan blades of the fan 6 are located at the end of the fan 6 closest to the stator core 4, and the gear 84 is located at the end of the fan 6 furthest from the stator core 4. In this invention, cooling structures such as cooling water channels can also be provided inside the stator core 4.

[0049] The following describes a preferred embodiment of the internal drive electromagnetic roller provided by the present invention.

[0050] like Figure 1 As shown, the internally driven electromagnetic roller provided by the present invention includes a central shaft 1, a roller 2, a permanent magnet 3, a stator core 4, a coil 5, a fan 6, and a transmission assembly. The stator core 4, the coil 5, the fan 6, and the transmission assembly are all located inside the roller 2.

[0051] The roller 2 includes a roller body 21, a first end cover 22, and a second end cover 23. The first end cover 22 and the second end cover 23 are respectively fixedly installed at the front and rear ends of the roller body 21 by bolts. The permanent magnet 3 is fixed on the inner wall of the roller body 21. The first end cover 22 and the second end cover 23 are both mounted on the central shaft 1 by bearings, so that the roller 2 can rotate around the central shaft 1.

[0052] Three auxiliary reinforcing bars 7 are fixedly installed on the central shaft 1, such as... Figure 2 As shown, the auxiliary ribs 7 are elongated strips, arranged along the axial direction of the central shaft 1, and evenly distributed around the central shaft 1. Each auxiliary rib 7 has three inclined elliptical through holes 71. The stator core 4 has a central hole 41 and is fitted onto the central shaft 1. The radially outer end face (the end face away from the central shaft) of the auxiliary ribs 7 fixed on the central shaft 1 is welded to the inner wall of the central hole 41 of the stator core 4. There is a cavity between the inner wall of the central hole 41 of the stator core 4 and the central shaft 1, connecting the two ends of the stator core 4.

[0053] Fan 6 is located at one end of the central hole 41 and is rotatably mounted on the central shaft 1 via bearings. The fan blades of fan 6 face the central hole 41. The transmission assembly is a differential disc, including an internal gear ring 81, a sun disk 82, planetary gears 83, and gears 84. The outer wall of the internal gear ring 81 is welded to the inner wall of the roller body 21 as a single unit. The sun disk 82 is fixedly mounted on the central shaft 1 via a shoulder, a sun key, and a retaining ring. The sun disk 82 is located on the side of fan 6 away from the stator core 4 (rear side). There are three planetary gears 83, all rotatably mounted on the sun disk 82 via bearings. Each planetary gear 83 is located inside the internal gear ring 81. Gears 84 are fixed to the fan mount and are located inside the internal gear ring 81. Gears 84 mesh with planetary gears 83, and planetary gears 83 mesh with the internal gear ring 81.

[0054] When the electromagnetic roller provided in the above embodiment is in operation, the roller 2 rotates, and the internal gear ring 81, which is welded to it, rotates accordingly. The internal gear ring 81 drives the planetary gears 83 on the sun disk 82 to rotate. Since the sun disk 82 is fixedly connected to the central shaft 1, the planetary gears 83 can only rotate on their own axis. The planetary gears 83 mesh with the gears 84 on the fan 6, thereby driving the fan 6 to rotate. The rotating planetary gears 83 drive the gears 84 to rotate, thereby driving the fan 6 to rotate.

[0055] The electromagnetic drum provided by this invention drives the rotation of the differential plate through the rotation of the drum 2, thereby accelerating the rotation of the fan 6 and forming a cooling system for the interior of the electromagnetic drum. This is completely different from the existing technology that uses a reducer to drive the fan-shaped housing to rotate, forming an external air cooling method. Furthermore, the fan 6 of the electromagnetic drum provided by this invention is located on one side of the stator core 4 and can be disassembled separately. Therefore, when the differential plate or cooling fan 6 inside the drum is damaged, it can be easily disassembled and repaired. Compared with the existing technology that requires replacing the entire outer casing, the electromagnetic drum provided by this invention has a lower operating cost.

[0056] The internal drive electromagnetic drum provided by this invention has a slow rotation speed and a large torque, and can be applied to mining belts. By setting a differential plate, the rotation speed of the cooling fan 6 is increased, thereby increasing the heat dissipation effect inside the electromagnetic drum.

[0057] Similar to the internally driven electromagnetic drum technology concept provided in the above embodiments, the present invention also provides an electromagnetic drum heat dissipation method, comprising:

[0058] A fan 6 is installed in the space between the roller 2 of the electromagnetic roller and the central shaft 1. The fan 6 is rotatably mounted on the central shaft 1.

[0059] A cavity is formed between the stator core 4 and the central shaft 1; the inner wall of the central hole 41 of the stator core 4 can be fixedly connected to the auxiliary rib 7 fixed on the central shaft 1 to form a cavity between the stator core 4 and the central shaft 1.

[0060] The rotating roller 2 drives the fan 6 to rotate, causing air inside the roller 2 to flow through the cavity and circulate within the roller 2.

[0061] Preferably, the fan 6 rotates at a speed greater than the roller 2 to improve the heat dissipation effect of the electromagnetic roller.

[0062] The rotating roller 2 drives the fan 6 to rotate in the following manner: an internal gear ring 81 is fixed on the roller 2; a sun disk 82 is fixedly mounted on the central shaft 1; a planetary gear 83 is rotatably mounted on the sun disk 82; and a gear 84 is fixedly mounted on the fan 6. The gear 84 meshes with the planetary gear 83, and the planetary gear 83 meshes with the internal gear ring 81. When the roller 2 drives the internal gear ring 81 to rotate, the internal gear ring 81 drives the planetary gear 83 to rotate, and the rotating planetary gear 83 drives the gear 84 to rotate, thereby driving the fan 6 to rotate.

[0063] In summary, the internally driven electromagnetic roller and its heat dissipation method provided by this invention, utilizing an internally driven cooling fan 6, effectively improve the overall sealing of the roller while retaining its heat dissipation function, thus enhancing the applicability of the electromagnetic roller. Furthermore, the large cooling fan 6 effectively solves the problem of high roller temperature caused by limited heat dissipation area and the lack of cooling structures in the cavity, hindering effective heat dissipation. Simultaneously, the use of a differential disc enables a lower-speed roller to drive the cooling fan 6 at a higher speed, resolving the issue of slow cooling due to a slower roller speed resulting in a slower fan speed and poor heat dissipation, thereby improving the heat dissipation effect.

[0064] While various embodiments of the invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of the invention. The appended claims are intended to define the scope of protection of the invention and therefore cover modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. An internally driven electromagnetic roller, characterized in that... The device includes a central shaft (1), a roller (2) rotatably mounted on the central shaft (1), a permanent magnet (3) fixedly mounted on the roller (2), a stator core (4) fixedly mounted on the central shaft (1), a coil (5) fixedly mounted on the stator core (4), a fan (6) rotatably mounted on the central shaft (1), and a transmission assembly. The stator core (4), coil (5), and fan (6) are located inside the roller (2). The stator core (4) has a central hole (41), and there is a cavity between the inner wall of the central hole (41) and the central shaft (1) that connects the two ends of the stator core (4). The fan (6) is located at one end of the central hole (41), and the fan blades of the fan (6) face the central hole (41). The roller (2) is connected to the fan (6) through the transmission assembly to drive the fan (6) to rotate. The transmission assembly includes an internal gear ring (81) fixedly mounted on the roller (2), a sun disk (82) fixedly mounted on the central shaft (1), a planetary gear (83) rotatably mounted on the sun disk (82), and a gear (84) fixedly mounted on the fan (6). The gear (84) meshes with the planetary gear (83), and the planetary gear (83) meshes with the internal gear ring (81). When the roller (2) drives the internal gear ring (81) to rotate, the internal gear ring (81) drives the planetary gear (83) to rotate, and the rotating planetary gear (83) drives the gear (84) to rotate, thereby driving the fan (6) to rotate.

2. The internally driven electromagnetic roller according to claim 1, characterized in that, An auxiliary rib (7) is fixedly installed on the central shaft (1). The auxiliary rib (7) is arranged along the axial direction of the central shaft (1). The stator core (4) is fixed on the central shaft (1) by the auxiliary rib (7). The auxiliary rib (7) is fixedly connected to the wall of the central hole (41) of the stator core (4).

3. The internally driven electromagnetic roller according to claim 2, characterized in that, The number of auxiliary ribs (7) is multiple, and the multiple auxiliary ribs (7) are evenly distributed around the central axis (1).

4. The internally driven electromagnetic roller according to claim 2, characterized in that, The auxiliary rib (7) is provided with a through hole (71) connecting the two sides of the auxiliary rib (7).

5. The internally driven electromagnetic roller according to claim 1, characterized in that, The fan (6) is mounted on the central shaft (1) by bearings. The fan blades of the fan (6) are located at the end of the fan (6) closer to the stator core (4), and the gear (84) is located at the end of the fan (6) away from the stator core (4).

6. The internally driven electromagnetic roller according to claim 1, characterized in that, The roller (2) includes a roller body (21), a first end cap (22) fixedly installed at one end of the roller body (21), and a second end cap (23) fixedly installed at the other end of the roller body (21). The first end cap (22) and the second end cap (23) are both mounted on the central shaft (1) by bearings. The internal gear ring (81) is welded to the inner wall of the roller body (21).

7. A method for heat dissipation using an electromagnetic roller, characterized in that, include: A fan (6) is installed in the space between the drum (2) of the electromagnetic drum and the central shaft (1); A cavity is formed between the stator core (4) and the central shaft (1); The rotating drum (2) drives the fan (6) to rotate, causing the air inside the drum (2) to flow through the cavity and circulate inside the drum (2).

8. The electromagnetic drum heat dissipation method according to claim 7, characterized in that, The fan (6) rotates at a speed greater than that of the drum (2).

9. The electromagnetic drum heat dissipation method according to claim 8, characterized in that, The rotating roller (2) drives the fan (6) to rotate, including: An internal gear ring (81) is fixed on the roller (2), a sun disk (82) is fixedly mounted on the central shaft (1), a planetary gear (83) is rotatably mounted on the sun disk (82), and a gear (84) is fixedly mounted on the fan (6). The gear (84) meshes with the planetary gear (83), and the planetary gear (83) meshes with the internal gear ring (81). When the roller (2) drives the internal gear ring (81) to rotate, the internal gear ring (81) drives the planetary gear (83) to rotate, and the rotating planetary gear (83) drives the gear (84) to rotate, thereby driving the fan (6) to rotate.

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