A wind-cooled permanent magnet drum motor

Abstract

This invention relates to the field of drum motor technology, and more particularly to an air-cooled permanent magnet drum motor, comprising a stator shaft, a rotor drum, and end covers; a ventilation slot is provided on the stator shaft; an electrostatic generator is fixedly connected inside the ventilation slot; this invention, by providing ventilation slots and ventilation holes in the stator shaft, allows air to enter the rotor drum through the ventilation slots and ventilation holes, and then by providing an electrostatic generator and metal plates, utilizes electrostatic adsorption to remove dust particles from the air, thereby reducing the dust content in the air entering the rotor drum and reducing the impact of dust on the operation of the permanent magnet drum motor; compared to the method of using a filter screen, this invention reduces the obstruction of airflow entering the rotor drum, and when the dust on the metal plates increases, it will not affect the airflow between the metal plates, and will not obstruct airflow, thus not affecting the heat dissipation of the coils wound on the stator shaft, the rotor drum, and the permanent magnet.

Description

Technical Field

[0001] This invention relates to the field of drum motor technology, and in particular to an air-cooled permanent magnet drum motor. Background Technology

[0002] A permanent magnet drum motor has permanent magnets mounted on its drum. When current is passed through the coil wound on the fixed shaft of the permanent magnet drum motor, the drum part of the permanent magnet drum motor rotates and becomes magnetic. Therefore, permanent magnet drum motors are often used for magnetic separation and as a power source for conveyor belts.

[0003] Permanent magnet drum motors generate heat during use. Overload can cause the temperature of the permanent magnet drum motor to rise sharply, causing the permanent magnets to demagnetize, thus weakening the magnetism of the permanent magnets or even completely demagnetizing them. Therefore, it is necessary to cool down the permanent magnet drum motor.

[0004] In the existing technology, oil cooling or air cooling is generally used to cool permanent magnet drum motors. However, oil cooling needs to be kept sealed to prevent leakage that could damage the permanent magnet drum motor.

[0005] In existing technologies, such as the utility model patent with application number CN202220046227.X, air cooling is used to dissipate heat from the permanent magnet drum motor. Windows are opened on both sides of the drum, and air flows in from one side and out from the other, carrying away heat. However, this heat dissipation method has limitations. When there is a lot of dust in the environment where the permanent magnet drum motor is used, such as in a mining site, dust in the air will enter the permanent magnet drum motor. The filter screens set on both sides of the permanent magnet drum motor will obstruct the airflow, reduce the air intake, and weaken the heat dissipation effect on the permanent magnet. When dust clogs the filter screen, it further obstructs the airflow, thus causing limitations.

[0006] Therefore, we propose an air-cooled permanent magnet drum motor. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the present invention provides an air-cooled permanent magnet drum motor, which overcomes the shortcomings of the prior art and aims to solve the problems in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an air-cooled permanent magnet drum motor, comprising...

[0009] The stator shaft, rotor drum, and end cover are provided; a coil is wound on the stator shaft; a permanent magnet is fixed to the inner wall of the rotor drum; the end cover is connected to both sides of the rotor drum by bolts, and flow windows are evenly provided on the end cover.

[0010] The rotor drum is uniformly provided with helical blades;

[0011] The stator shaft is provided with a ventilation groove; the ventilation groove passes through one end of the stator shaft, and the stator shaft is provided with ventilation holes; the ventilation holes are evenly arranged around the stator shaft, and the ventilation holes are connected to the ventilation groove;

[0012] The ventilation duct has evenly spaced fixing slots on its wall; a metal plate is inserted into the fixing slot; an electrostatic generator is fixedly connected to the ventilation duct; a connecting spring is fixedly connected to the output end of the electrostatic generator; and both ends of the connecting spring are fixedly connected to the ventilation duct.

[0013] By setting ventilation slots and holes inside the stator shaft, air enters the rotor drum through these slots and holes. An electrostatic generator and metal plates are then installed to electrostatically attract dust particles from the air, reducing the dust content in the air entering the rotor drum and minimizing the impact of dust on the operation of the permanent magnet drum motor. Compared to using a filter, this invention reduces the obstruction to airflow into the rotor drum. Even when dust accumulates on the metal plates, it does not affect airflow between the plates, thus not hindering airflow and consequently not affecting the heat dissipation of the coils wound on the stator shaft, the rotor drum, and the permanent magnets.

[0014] Preferably, the fixing groove is symmetrically inclined about the axis of the stator shaft.

[0015] Preferably, the flow window is hinged with a sealing blade by a rotating torsion spring; the sealing blade is evenly and equidistantly arranged within the flow window.

[0016] When air from the external environment enters between two adjacent metal plates and flows through the end of the metal plate near the ventilation hole, the airflow moves from a relatively open space into a relatively narrow space. After the airflow accumulates, it accelerates through the narrower area, thereby increasing the airflow velocity. Utilizing the slit effect, the airflow velocity entering the ventilation hole increases, resulting in an increased initial airflow velocity into the rotor drum. When the airflow is agitated by the helical blades, the velocity increases again, thus increasing the cooling effect on the stator shaft and coils, as well as the rotor drum and permanent magnet.

[0017] When the rotor drum stops rotating, the airflow inside the rotor drum stops flowing out, thereby rotating the torsion spring and causing the sealing blades to return to their original shape, resealing the flow window. This prevents dust from entering the rotor drum of the invention through the flow window and affecting the operation of the invention when the invention is not in use.

[0018] Preferably, a collection plate is placed inside the ventilation slot; the collection plate is semi-circular and has evenly spaced locking grooves at one end; the metal plate can be inserted into the locking grooves.

[0019] Preferably, a round rod is fixedly connected to one end of the metal plate near the connecting spring.

[0020] When the worker inserts the metal plate into the fixing slot, the round rod enters the gap of the connecting spring first, and then the metal plate enters the gap of the connecting spring. When the metal plate is pulled out of the fixing slot, the metal plate drives the round rod to pull out the connecting spring. At the moment the round rod is pulled out of the connecting spring, the part of the connecting spring that was in contact with the round rod is pushed apart by the round rod and then returns to its original position. This causes the connecting spring to shake violently, causing the dust on the connecting spring to be shaken off and fall into the collection plate.

[0021] Preferably, a connecting wire is fixed to the end of the metal plate away from the connecting spring.

[0022] The static electricity remaining on the metal plate is eliminated by the connection between the wire and the ground. Then, the worker pulls the metal plate out of the fixing slot to prevent static electricity residue from remaining on the metal plate when the worker comes into contact with it, which could cause a sharp discharge when the worker's hand touches the metal plate and startle the worker.

[0023] Preferably, a barrier ring is provided inside the rotor drum; the outer side wall of the barrier ring is fixedly connected to the permanent magnet, the inner side wall of the barrier ring is fixedly connected to the helical blade, and the barrier ring is made of heat-insulating material.

[0024] The isolation ring separates the coil and the permanent magnet, preventing heat from being transferred to the permanent magnet through the isolation ring. This reduces the temperature of the permanent magnet and prevents it from demagnetizing. At the same time, the airflow from the helical blades only dissipates heat from the coil on the stator shaft, thus improving the heat dissipation effect on the coil.

[0025] Preferably, internal gear rings are bolted to both sides of the rotor drum; the side of the internal gear ring away from the rotor drum is bolted to the end cover; the internal gear ring is meshed with a first gear; an mounting ring is sleeved on the stator shaft; a connecting rod is fixedly connected to the side of the mounting ring; the first gear is rotatably connected to the connecting rod; a fan blade is rotatably connected to the mounting ring; the fan blade meshes with the first gear.

[0026] Through the transmission of the internal gear ring and the first gear, the angular velocity of the first gear is greater than that of the internal gear ring. When the size of the meshing part between the first gear and the fan blade is equal, the angular velocities between the first gear and the fan blade are equal, thereby increasing the transmission ratio between the internal gear ring and the fan blade, which in turn increases the rotational speed of the fan blade and increases the airflow velocity inside the rotor drum. Compared with the transmission method where the fan blade is connected to the rotor drum or end cover, the heat dissipation effect is enhanced, reducing the occurrence of overheating and demagnetization of the permanent magnet under heavy load conditions. Furthermore, when the load in the operating environment is small, the internal gear ring, the first gear, and the fan blade can be removed to reduce the loss of driving force when the rotor drum rotates.

[0027] The beneficial effects of this invention are:

[0028] 1. This invention provides ventilation slots and holes within the stator shaft, allowing air to enter the rotor drum through these channels. An electrostatic generator and metal plates are then installed to electrostatically attract dust particles from the air, reducing the dust content in the air entering the rotor drum and minimizing its impact on the operation of the permanent magnet drum motor. Compared to using a filter, this invention reduces airflow obstruction into the rotor drum. Even when dust accumulates on the metal plates, it does not impede airflow between the plates, thus avoiding obstruction and ensuring proper heat dissipation for the coils wound on the stator shaft, the rotor drum, and the permanent magnets.

[0029] 2. This invention increases the rotational speed of the fan blades by setting an internal gear ring, a first gear, and fan blades, thereby increasing the transmission ratio between the internal gear ring, the first gear, and the fan blades. In heavy-load environments, the internal gear ring, the first gear, and the fan blades can be installed at both ends of the stator shaft to increase heat dissipation for the coils and permanent magnets. In light-load environments, the internal gear ring, the first gear, and the fan blades can be removed to reduce the loss of driving force when the rotor drum rotates. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention in Embodiment 1;

[0031] Figure 2 for Figure 1 Cross-sectional view of the end cap, flow window, and sealing blade at point AA;

[0032] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0033] Figure 4 This is a partial cross-sectional view of the stator shaft, metal plate, and collecting plate in Embodiment 1;

[0034] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0035] Figure 6 This is a schematic diagram of the structure of the rotor drum, permanent magnet, barrier ring and helical blade in this invention;

[0036] Figure 7 For implementation of the second part, the positional relationship diagram between the internal gear ring, the first gear, the mounting ring, and the fan blade of the present invention is shown.

[0037] Figure 8 This is a cross-sectional view showing the positional relationship between the internal gear ring, gear number one, mounting ring, and fan blades.

[0038] In the diagram: 1. Stator shaft; 11. Ventilation slot; 12. Ventilation hole; 13. Fixing slot; 14. Metal plate; 15. Electrostatic generator; 16. Connecting spring; 2. Coil; 3. Rotor drum; 31. Permanent magnet; 32. Helical blade; 4. End cover; 41. Flow window; 42. Rotating torsion spring; 43. Blocking blade; 44. Collecting plate; 45. Engaging groove; 46. Round rod; 47. Connecting wire; 5. Barrier ring; 6. Internal gear ring; 61. Gear No. 1; 62. Mounting ring; 63. Fan blade; 64. Connecting rod. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1:

[0041] Refer to the instruction manual appendix Figure 1 A type of air-cooled permanent magnet drum motor, including

[0042] Stator shaft 1, rotor drum 3 and end cover 4; coil 2 is wound on stator shaft 1; permanent magnet 31 is fixed to the inner wall of rotor drum 3; end cover 4 is connected to both sides of rotor drum 3 by bolts, and flow windows 41 are evenly opened on end cover 4;

[0043] Spiral blades 32 are evenly arranged inside the rotor drum 3;

[0044] A ventilation groove 11 is provided on the stator shaft 1; the ventilation groove 11 passes through one end of the stator shaft 1, and a ventilation hole 12 is provided on the stator shaft 1; the ventilation holes 12 are evenly arranged around the stator shaft 1, and the ventilation holes 12 are connected to the ventilation groove 11.

[0045] Refer to the instruction manual appendix Figure 3The ventilation slot 11 has evenly spaced fixing slots 13 on its wall; a metal plate 14 is inserted into the fixing slot 13; an electrostatic generator 15 is fixedly connected to the ventilation slot 11; a connecting spring 16 is fixedly connected to the output end of the electrostatic generator 15; and the two ends of the connecting spring 16 are fixedly connected to the ventilation slot 11.

[0046] During operation, alternating current is passed through the coil 2 wound on the stator shaft 1, thus generating an alternating magnetic field on the stator shaft 1. The permanent magnet 31 on the inner wall of the rotor drum 3 is driven by the magnetic field generated by the coil 2 on the stator shaft 1, causing the rotor drum 3 to rotate. The operator inserts metal plates 14 into the fixing slots 13 on both sides of the electrostatic generator 15, so that the metal plates 14 on both sides of the electrostatic generator 15 contact the corresponding connecting springs 16, and the metal plates 14 are inserted into the gaps on the connecting springs 16, thus connecting the circuit between the connecting springs 16 and the metal plates 14. The electrostatic generator 15 fixed in the ventilation slot 11 transmits static electricity to the connecting springs 16 on both sides through the output end, and then through the connecting springs 16 to the metal plates 14 that are stuck on the connecting springs 16, thus making the metal plates 14 statically charged.

[0047] In environments with high dust levels, such as during magnetic separation or conveyor belt operation, the rotation of the rotor drum 3 drives the spiral blades 32 to rotate. This causes the spiral blades 32 to move the surrounding airflow, blowing the air inside the rotor drum 3 towards the flow windows 41. The airflow exits through the flow windows 41 on both sides of the rotor drum 3. As the airflow passes through the spiral blades 32, it carries away surrounding heat, causing the heat generated by the coils 2 wound on the stator shaft 1 to be discharged from the rotor drum 3. This achieves the purpose of cooling the stator shaft 1, coils 2, rotor drum 3, and permanent magnet 31. Because the air inside the rotor drum 3 is blown out, the air pressure inside the rotor drum 3 decreases, allowing air from the outside environment to pass through the stator shaft 1... The air enters the ventilation slot 11 into the ventilation hole 12, and then enters the rotor drum 3 from the ventilation hole 12, replenishing the air in the rotor drum 3. When the air from the outside environment enters the ventilation slot 11 on the stator shaft 1, the dust in the air is attracted by the electrostatic charge on the metal plate 14, thus reducing the amount of dust in the air and reducing the dust content in the air entering the rotor drum 3. After the dust on the metal plate 14 reaches a certain level, the operator pulls the metal plate 14 out of the fixing slot 13, thereby separating the metal plate 14 from the connecting spring 16. After cleaning the metal plate 14 and removing the dust, the operator inserts the metal plate 14 back into the fixing slot 13, and the metal plate 14 is inserted back into the gap of the connecting spring 16.

[0048] This invention provides ventilation slots 11 and ventilation holes 12 within the stator shaft 1, allowing air to enter the rotor drum 3 through these channels. An electrostatic generator 15 and a metal plate 14 are then installed to electrostatically attract dust particles from the air, reducing the dust content in the air entering the rotor drum 3 and minimizing the impact of dust on the operation of the permanent magnet drum motor. Compared to using a filter, this invention reduces the obstruction to airflow entering the rotor drum 3. Even when dust accumulates on the metal plate 14, it does not impede airflow between the plates, thus avoiding obstruction and ensuring proper heat dissipation for the coils 2 wound on the stator shaft 1, the rotor drum 3, and the permanent magnet 31.

[0049] Refer to the instruction manual appendix Figure 4 In this embodiment, the fixing groove 13 is symmetrically inclined about the axis of the stator shaft 1.

[0050] Refer to the instruction manual appendix Figure 2 In this embodiment, a blocking blade 43 is hinged to the flow window 41 by a rotating torsion spring 42; the blocking blade 43 is evenly and equidistantly arranged within the flow window 41.

[0051] In this embodiment, the fixing groove 13 is symmetrically inclined about the axis of the stator shaft 1, so that the metal plate 14 inserted into the fixing groove 13 is also symmetrically inclined. The two symmetrical metal plates 14 are in a figure-eight shape, with the larger opening facing the opening of the ventilation groove 11 and the smaller opening facing the ventilation hole 12. Therefore, when air from the external environment enters between the two adjacent metal plates 14 and flows through the end of the metal plate 14 near the ventilation hole 12, the airflow enters the relatively narrow space from the relatively open space. After the airflow accumulates, it accelerates through the narrow area, thereby increasing the airflow velocity. By utilizing the slit effect, the airflow velocity entering the ventilation hole 12 increases, which increases the initial airflow velocity entering the rotor drum 3. When it is blown by the spiral blade 32, the velocity increases again, which increases the cooling effect on the stator shaft 1 and coil 2, as well as the rotor drum 3 and permanent magnet 31.

[0052] In this embodiment, the sealing blades 43 are uniformly hinged to the flow window 41 by a rotating torsion spring 42. When the rotor drum 3 rotates with the spiral blades 32, the airflow inside the rotor drum 3 is blown out of the flow window 41 and blows the sealing blades 43, causing them to rotate outward. This creates gaps between the sealing blades 43, and the airflow inside the rotor drum 3 flows out through these gaps. When the rotor drum 3 stops rotating, the airflow inside the rotor drum 3 stops flowing out, and the rotating torsion spring 42 restores the sealing blades 43 to their original position, resealing the flow window 41. This prevents dust from entering the rotor drum 3 through the flow window 41 and affecting the operation of the invention when it is not in use.

[0053] Instruction manual attached Figure 4 In this embodiment, a collection plate 44 is placed inside the ventilation slot 11; the collection plate 44 is semi-circular tube-shaped, and a locking groove 45 is evenly opened at one end of the collection plate 44; the metal plate can be inserted into the locking groove 45.

[0054] Refer to the instruction manual appendix Figure 4 Included with instruction manual Figure 5 In this embodiment, a round rod 46 is fixedly connected to one end of the metal plate 14 near the connecting spring 16.

[0055] When the staff pulls the metal plate 14 out of the fixing groove 13, the metal plate 14 will vibrate when it is pulled out, and some of the dust on the metal plate 14 will be shaken off and fall into the collection plate 44. Therefore, after all the metal plates 14 are pulled out of the fixing groove 13, the staff will slowly pull out the collection plate 44 from the ventilation groove 11 and clean the dust that has fallen into the collection plate 44. This prevents the dust on the metal plate 14 from falling into the bottom of the ventilation groove 11 when the staff pulls out the metal plate 14, which is relatively deep and inconvenient for the staff to clean.

[0056] In this embodiment, a round rod 46 is fixedly connected to one end of the metal plate 14 that is inserted into the gap of the connecting spring 16. When the operator inserts the metal plate 14 into the fixing groove 13, the round rod 46 enters the gap of the connecting spring 16 first, followed by the metal plate 14. When the metal plate 14 is pulled out of the fixing groove 13, it drives the round rod 46 to pull out the connecting spring 16. At the moment the round rod 46 is pulled out of the connecting spring 16, the part of the connecting spring 16 that is in contact with the round rod 46 is pushed apart by the round rod 46 and returns to its original position, causing the connecting spring 16 to shake violently. This causes the dust on the connecting spring 16 to be shaken off and fall into the collecting plate 44. When multiple metal plates 14 are pulled out of the fixing groove 13, the connecting spring 16 will shake multiple times, thereby preventing dust from accumulating on the connecting spring 16. As the airflow passes through, the dust on the connecting spring 16 is carried into the rotor drum 3, improving the effectiveness of the invention.

[0057] Refer to the instruction manual appendix Figure 3 In this embodiment, a connecting wire 47 is fixedly connected to one end of the metal plate 14 away from the connecting spring 16.

[0058] In this embodiment, the connecting wire 47 is an electrical wire containing an insulation layer. When the invention is running, the connecting wire 47 is placed in the ventilation slot 11. When the invention stops running and the operator needs to remove the metal plate 14, the operator first holds the insulation layer of the connecting wire 47 and places the connecting wire 47 on the ground. Thus, the static electricity remaining on the metal plate 14 is eliminated through the connection between the connecting wire 47 and the ground. At this time, the operator then removes the metal plate 14 from the fixing slot 13. This prevents static electricity from remaining on the metal plate 14 when the operator comes into contact with it, and prevents a sharp discharge from occurring the moment the operator's hand touches the metal plate 14, which could startle the operator.

[0059] Refer to the instruction manual appendix Figure 6 In this embodiment, a barrier ring 5 is provided inside the rotor drum 3; the outer side wall of the barrier ring 5 is fixedly connected to the permanent magnet 31, and the inner side wall of the barrier ring 5 is fixedly connected to the spiral blade 32. The barrier ring 5 is made of heat insulation material.

[0060] In this embodiment, the barrier ring 5 is made of asbestos board mixed with plastic, which can isolate heat transfer.

[0061] The heat generated by the coil 2 wound on the stator shaft 1 is transferred to the permanent magnet 31 through the air. Therefore, as the rotor drum 3 rotates with the blocking ring 5 and the helical blade 32, the helical blade 32 agitates the air around the coil 2 wound on the stator shaft 1, causing the air between the blocking ring 5 and the coil 2 to flow towards the flow window 41 and then out of the rotor drum 3. At the same time, the blocking ring 5 isolates the coil 2 and the permanent magnet 31, preventing heat from being transferred to the permanent magnet 31 through the blocking ring 5, thereby reducing the temperature of the permanent magnet 31 and preventing demagnetization of the permanent magnet 31. Meanwhile, the airflow blown out by the helical blade 32 only dissipates heat from the coil 2 on the stator shaft 1, thus improving the heat dissipation effect of the coil 2.

[0062] Example 2:

[0063] Refer to the instruction manual appendix Figure 7 Included with instruction manual Figure 8 Based on Embodiment 1, in this embodiment, internal gear rings 6 are bolted to both sides of the rotor drum 3; the side of the internal gear ring 6 away from the rotor drum 3 is bolted to the end cover 4; the internal gear ring 6 is meshed with a first gear 61; an mounting ring 62 is sleeved on the stator shaft 1; a connecting rod 64 is fixedly connected to the side of the mounting ring 62; the first gear 61 is rotatably connected to the connecting rod 64; a fan blade 63 is rotatably connected to the mounting ring 62; the fan blade 63 meshes with the first gear 61.

[0064] When the present invention is used in a high-load environment for a long time, the operator can unscrew the bolts between the original end cover 4 and the rotor drum 3 to remove the end cover 4, then install the internal gear ring 6 on both sides of the rotor drum 3 with bolts, then put the mounting ring 62 and the fan blade 63 on the stator shaft 1, and then install the end cover 4 on the internal gear ring 6 with bolts to complete the installation; when the present invention is running under a high-load environment, the rotor drum 3 rotates and drives the internal gear ring 6 to rotate, thereby the internal gear ring 6 drives the first gear 61 to rotate, the first gear 61 drives the fan blade 63 to rotate, thereby the fan blade 63 on both sides of the coil 2 blows the airflow in the rotor drum 3 toward the flow window 41, thereby the airflow in the rotor drum 3 passes through the gap between the internal gear ring 6, the first gear 61, and the mounting ring 62, and then blows out through the flow window 41;

[0065] In this embodiment, through the transmission of the internal gear ring 6 and the first gear 61, the angular velocity of the first gear 61 is greater than that of the internal gear ring 6. When the size of the meshing part of the first gear 61 and the fan blade 63 is equal, the angular velocities between the first gear 61 and the fan blade 63 are equal, thereby increasing the transmission ratio between the internal gear ring 6 and the fan blade 63, thus increasing the rotational speed of the fan blade 63 and increasing the airflow velocity inside the rotor drum 3. Compared with the transmission method where the fan blade 63 is connected to the rotor drum 3 or the end cover 4, the heat dissipation effect is enhanced, reducing the occurrence of overheating and demagnetization of the permanent magnet 31 under heavy load conditions. When the load in the operating environment is small, the internal gear ring 6, the first gear 61, and the fan blade 63 can be removed to reduce the loss of driving force when the rotor drum 3 rotates.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air-cooled permanent magnet drum motor, comprising: Stator shaft (1); a coil (2) is wound on the stator shaft (1); Rotor drum (3); a permanent magnet (31) is fixedly connected to the inner wall of the rotor drum (3); End cap (4); The end cap (4) is located on both sides of the rotor drum (3) and connected to the rotor drum (3), and the end cap (4) is provided with flow windows (41) evenly. Its features are: The rotor drum (3) is uniformly provided with helical blades (32); The stator shaft (1) is provided with a ventilation groove (11); the ventilation groove (11) passes through one end of the stator shaft (1), and the stator shaft (1) is provided with a ventilation hole (12); the ventilation hole (12) is evenly arranged around the stator shaft (1), and the ventilation hole (12) is connected to the ventilation groove (11); The ventilation slot (11) has evenly spaced fixing slots (13) on its wall; a metal plate (14) is inserted into the fixing slot (13); an electrostatic generator (15) is fixedly connected to the ventilation slot (11); a connecting spring (16) is fixedly connected to the output end of the electrostatic generator (15); and both ends of the connecting spring (16) are fixedly connected to the ventilation slot (11). The metal plate (14) is inserted into the gap on the connecting spring (16), so that the circuit between the connecting spring (16) and the metal plate (14) is connected; the electrostatic generator (15) fixed in the ventilation slot (11) transmits static electricity to the connecting springs (16) on both sides through the output end, and then through the connecting springs (16) to the metal plate (14) that is stuck on the connecting springs (16), so that the metal plate (14) is attached to static electricity; A sealing blade (43) is hinged to the flow window (41) by a rotating torsion spring (42); the sealing blade (43) is evenly and equidistantly arranged in the flow window (41); A collection plate (44) is placed inside the ventilation slot (11); the collection plate (44) is semi-circular, and a locking groove (45) is evenly provided at one end of the collection plate (44); the metal plate (14) can be inserted into the locking groove (45); One end of the metal plate (14) inserted into the gap of the connecting spring (16) is fixedly connected to a round rod (46). A connecting wire (47) is fixed to one end of the metal plate (14) away from the connecting spring (16).

2. A fan-cooled permanent magnet drum motor according to claim 1, characterized in that: The fixing groove (13) is symmetrically inclined about the axis of the stator shaft (1).

3. A machine according to claim 2, wherein: The rotor drum (3) is provided with a barrier ring (5); the outer wall of the barrier ring (5) is fixedly connected to the permanent magnet (31), the inner wall of the barrier ring (5) is fixedly connected to the spiral blade (32), and the barrier ring (5) is made of heat insulation material.

4. A fan-cooled permanent-magnet drum motor according to claim 3, characterized in that: Internal gear rings (6) are bolted to both sides of the rotor drum (3); the side of the internal gear ring (6) away from the rotor drum (3) is bolted to the end cover (4); the internal gear ring (6) is meshed with a first gear (61); an mounting ring (62) is sleeved on the stator shaft (1); a connecting rod (64) is fixed to the side of the mounting ring (62); the first gear (61) is rotatably connected to the connecting rod (64); a fan blade (63) is rotatably connected to the mounting ring (62); the fan blade (63) meshes with the first gear (61).

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