A hybrid excitation electric drum direct drive motor

Abstract

The invention discloses a hybrid excitation electric roller direct drive motor, which relates to the technical field of motors, and comprises a shell, wherein a shaft is rotatably connected at the center of the shell, and a stator core is rotatably connected to the outer wall of the shaft. By setting a material-saving excitation mechanism, the hybrid magnetic technology is applied to a magnetic-assisting synchronous reluctance motor. Compared with a conventional rare earth permanent magnet motor, on the one hand, the characteristics of the magnetic-assisting synchronous reluctance structure are utilized to fully utilize the reluctance torque and reduce the amount of permanent magnets. On the other hand, the hybrid magnetic technology is adopted to mix ferrite without rare earth and neodymium iron boron containing rare earth, which can further reduce the amount of rare earth permanent magnets. Under the same performance index, the amount of rare earth permanent magnets can be reduced by about half, thereby reducing material costs. Secondly, through reasonable permanent magnet arrangement, the distribution of the magnetic field is adjusted, the magnetic circuit design is more optimized, and the magnetic field is accurately controlled, which can improve the anti-demagnetization ability of the ferrite under the reverse magnetic field.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a hybrid excitation electric roller direct drive motor. Background Art

[0002] The torque of a permanent magnet motor is composed of permanent magnet torque and reluctance torque. The permanent magnet torque is provided by permanent magnets, and the reluctance torque is provided by the reluctance structure, which realizes the regulation and control of the main magnetic field of the motor, thereby improving the speed regulation, driving performance or voltage regulation characteristics of the motor. Direct drive of the electric drum means that the motor is used to directly drive the drum without the need for transmission media such as belts, thereby improving efficiency and reducing noise and vibration.

[0003] In the prior art, the working principle of a conventional rare earth permanent magnet motor is the same as that of an electrically excited synchronous motor, but the difference is that a rare earth permanent magnet motor uses permanent magnets instead of excitation windings for excitation. When a three-phase alternating current with a frequency of f is applied to the three-phase stator winding of the rare earth permanent magnet motor, a rotating magnetic field moving at a synchronous speed will be generated, thereby driving the motor to operate. However, rare earth permanent magnet materials such as neodymium iron boron are expensive, and their production process involves the extraction and processing of rare earth elements, which not only leads to an increase in material costs, but also ultimately affects the overall price of the motor due to the limited rare earth resources and market fluctuations. Secondly, as time goes by, the permanent magnets in the rare earth permanent magnet motor may experience magnetic field degradation. This degradation is mainly caused by the influence of the surrounding environment, mechanical wear and long-term operation, so it is difficult to avoid and easily affects the operating efficiency of the motor.

[0004] In addition, rare earth permanent magnet motors are very sensitive to temperature changes. High temperature environments will cause the magnetic properties of permanent magnet materials to decline, and may even cause partial demagnetization. This performance degradation not only affects the efficiency and output power of the motor, but may also shorten the life of the motor.

[0005] In view of this, the present invention proposes a hybrid excitation electric roller direct drive motor to make up for and improve the deficiencies of the prior art. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a hybrid excitation electric drum direct-drive motor which can reduce material costs and reduce the phenomenon of magnetic field degradation; can improve the torque density and efficiency of the motor; and can enhance the versatility and service life of the motor in different environments, so as to solve the corresponding technical problems raised in the above background technology.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is: a hybrid excitation electric drum direct drive motor, including a shell, a shaft rotatably connected at the center of the shell, and a stator core rotatably connected to the outer wall of the shaft, and also includes: a material-saving excitation mechanism for mixing magnets and reasonably arranging to reduce the amount of rare earth permanent magnets; a combined heat drive mechanism for combining different heat drive methods in different environments.

[0008] Preferably, the material-saving excitation mechanism includes an outer rotor core abutting against the inner wall of the outer shell, the inner wall of the outer rotor core is provided with a plurality of pairs of first hole slots equidistantly around the circumference, each pair of the first hole slots is provided with a plurality of threaded holes near the outer shell, the first hole slots and the corresponding threaded holes of the outer shell are both threadedly connected with fixing bolts, the inner wall of the outer rotor core is also provided with a plurality of pairs of second hole slots equidistantly around the circumference, the second hole slots are spaced apart from the first hole slots and distributed on the outer rotor core.

[0009] Preferably, the material-saving excitation mechanism also includes a plurality of NdFeBs fixedly connected to the outer wall of the outer rotor core, the plurality of NdFeBs are located on the side of each pair of second slots close to the outer shell, and a plurality of ferrites are equidistantly fixedly connected to the outer wall edge of the outer rotor core close to the outer shell, the number and corresponding circumferential positions of the ferrites and NdFeBs are consistent, and the side of the ferrites away from the NdFeBs is attached to the inner wall of the outer shell.

[0010] Preferably, the combined heat drive mechanism includes a threaded ring fixedly connected to the outer wall of the outer shell, the outer wall of the threaded ring is threadedly connected to a fan, a plurality of fins are equidistantly fixedly connected to the outer wall of the outer shell, the outer wall of the outer shell is also fixedly connected to a cooling pipe, one end of the cooling pipe is fixedly connected to a water inlet, and the other end of the cooling pipe is fixedly connected to a water outlet.

[0011] Preferably, the combined heat drive mechanism also includes a second leaf door fixedly connected to the edge of the inner wall of the outer shell, a sliding column is fixedly connected to the side of the second leaf door away from the shaft, the sliding column abuts against the fan, a plurality of grooves are opened at the center of the second leaf door, the outer wall of the sliding column is movably sleeved with the first leaf door, a plurality of protrusions are fixedly connected to the side of the first leaf door close to the second leaf door, and the outer wall of the protrusion is clamped in the groove.

[0012] Preferably, the combined heat drive mechanism further comprises a plurality of sealing rings, wherein the plurality of sealing rings are fixedly connected to a side of the first leaf door close to the second leaf door at equal intervals, and an outer wall of the sealing ring is in contact with the second leaf door.

[0013] Preferably, the combined heat drive mechanism also includes a card block fixedly connected to the edge of the first leaf door, a pair of card slots are opened on the side of the shell close to the second leaf door, the card block is snapped into the card slots, and a pair of anti-slip blocks are fixedly connected to the side of the first leaf door away from the second leaf door.

[0014] Preferably, the combined heat-driving mechanism further comprises a mounting frame fixedly connected to the inner wall of the outer shell, and the shaft rotates and penetrates the inner wall of the mounting frame.

[0015] Preferably, the cooling pipes are laid on the outer shell in a uniform and smoothly curved manner.

[0016] Preferably, the volume of the NdFeB is set smaller than the volume of the ferrite.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a material-saving excitation mechanism, the hybrid magnetic technology is applied to the magnetic-assisting synchronous reluctance motor. Compared with the conventional rare earth permanent magnet motor, on the one hand, the characteristics of the magnetic-assisting synchronous reluctance structure are utilized to fully utilize the reluctance torque and reduce the amount of permanent magnets. On the other hand, the hybrid magnetic technology is adopted to mix rare earth-free ferrite and rare earth-containing neodymium iron boron, which can further reduce the amount of rare earth permanent magnets. Under the same performance indicators, the amount of rare earth permanent magnets can be reduced by about half, thereby reducing material costs.

[0018] Secondly, through the reasonable arrangement of permanent magnets, the anti-demagnetization ability of ferrite in a reverse magnetic field can be improved. The second hole slot and the first hole slot are opened on the outer rotor core, which can conveniently connect and fix the outer rotor core to the shell, not only improving the assembly efficiency, but also ensuring the product quality, making the structure of the entire equipment more stable and reliable. At the same time, the heat dissipation area of ​​the outer rotor core can be increased, thereby improving its heat dissipation performance. In high-power motors, it can ensure that the equipment can maintain a stable working state during long-term operation. In addition, since the setting quantity and corresponding circumferential position of ferrite and NdFeB are consistent, and the volume of NdFeB is set smaller than the volume of ferrite, the first hole slot is opened on both sides of NdFeB, which can effectively adjust the distribution of the magnetic field, make the magnetic circuit design more optimized, accurately control the magnetic field, and reduce the phenomenon of magnetic field degradation.

[0019] 2. The setting of the outer rotor core also takes into account the requirements of cost performance and power density. When the power density is close to that of the rare earth permanent magnet motor, the material cost can be lower. By using a shell design with magnetic conductivity, the outer rotor core is fixed to the inner wall of the shell by fixing bolts, so that the outer shell of the drum is directly used as the rotor yoke, eliminating the yoke of the outer rotor core, reducing the amount of core material, and reducing the weight of the motor. At the same time, the air gap radius is relatively increased, and the magnetic resistance of the magnetic circuit is reduced, thereby improving the torque density and efficiency of the motor.

[0020] 3. By setting up a combined heat-driving mechanism, the first leaf door is rotated to open and close, and under the joint action of the card block, the card slot, the protrusion, the groove and the sealing ring, an independent sealing state is formed inside the shell in a press-sealed manner to adapt to the external environment requirements, so that the staff can choose to dissipate heat by air cooling, water cooling and a combination of heat sinks. The specific heat dissipation method can be weighed according to factors such as the power density, working environment and cost of the motor, which is conducive to enhancing the versatility of the motor in different environments, reducing the phenomenon of high temperature causing the magnetic properties of the magnetic material to decrease, thereby increasing the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention.

[0022] Figure 2 It is a rear-view stereoscopic structural schematic diagram of the present invention.

[0023] Figure 3 It is a schematic structural diagram of the outer rotor core connection shown in the present invention.

[0024] Figure 4 It is a schematic structural diagram of the ferrite connection shown in the present invention.

[0025] Figure 5 It is a schematic diagram of the cross-sectional structure shown in the present invention.

[0026] Figure 6 It is a structural schematic diagram of the threaded ring connection shown in the present invention.

[0027] Figure 7 It is a schematic structural diagram of the second leaf door connection shown in the present invention.

[0028] Figure 8 It is a structural schematic diagram of the card block connection shown in the present invention.

[0029] Fig. 9 It is a structural schematic diagram of the sealing ring connection shown in the present invention.

[0030] Fig.10 It is a schematic structural diagram of the bump connection shown in the present invention.

[0031] The numbers in the figure are: 1, housing; 2, shaft; 3, stator core.

[0032] 4. Material-saving excitation mechanism; 41. Outer rotor core; 42. NdFeB; 43. Ferrite; 44. First hole slot; 45. Second hole slot; 46. Fixing bolt.

[0033] 5. Combined heat dissipation mechanism; 51. Fan; 52. Fins; 53. Cooling pipe; 54. Water inlet; 55. Water outlet; 56. First leaf door; 57. Second leaf door; 58. Card slot; 59. Threaded ring; 510. Card block; 511. Mounting bracket; 512. Slide post; 513. Anti - detachment block; 514. Sealing ring; 515. Groove; 516. Protrusion. Detailed implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0035] Embodiment of the present invention: Please refer to Figures 1 to 10 As shown, a hybrid - excitation direct - drive motor for an electric drum includes a housing 1. A shaft 2 is rotatably connected to the center of the housing 1. A stator core 3 is rotatably connected to the outer wall of the shaft 2. It further includes: a material - saving excitation mechanism 4 for mixed magnetization and reasonable arrangement to reduce the usage of rare - earth permanent magnets.

[0036] A combined heat dissipation mechanism 5 for combining different heat dissipation methods for use in different environments.

[0037] The material - saving excitation mechanism 4 includes an outer - rotor core 41 that abuts against the inner wall of the housing 1. A plurality of pairs of first hole slots 44 are equidistantly arranged around the circumference on the inner wall of the outer - rotor core 41. A plurality of threaded holes are opened near the housing 1 for each pair of first hole slots 44. Fixing bolts 46 are commonly thread - connected at the positions of the first hole slots 44 and the corresponding threaded holes of the housing 1. A plurality of pairs of second hole slots 45 are also equidistantly arranged around the circumference on the inner wall of the outer - rotor core 41. The second hole slots 45 and the first hole slots 44 are distributed at intervals on the outer - rotor core 41.

[0038] The material - saving excitation mechanism 4 further includes a plurality of neodymium - iron - boron 42 fixedly connected to the outer wall of the outer - rotor core 41. A plurality of neodymium - iron - boron 42 are all located on one side of each pair of second hole slots 45 close to the housing 1. A plurality of ferrite 43 are equidistantly and fixedly connected to the outer wall edge of the outer - rotor core 41 close to the housing 1. The set numbers and circumferential corresponding positions of the ferrite 43 and the neodymium - iron - boron 42 are the same. The sides of the ferrite 43 away from the neodymium - iron - boron 42 are all attached to the inner wall of the housing 1.

[0039] The volume of the neodymium - iron - boron 42 is set to be smaller than the volume of the ferrite 43.

[0040] Among them: The material of the housing shell 1 has good magnetic conductivity to ensure the effective transmission and distribution of the magnetic field.

[0041] The effects achieved by this embodiment are as follows: In the prior art, rare earth permanent magnet materials such as NdFeB 42 are expensive, and their production process involves the extraction and processing of rare earth elements, which not only leads to an increase in material costs, but also ultimately affects the overall price of the motor due to the limited rare earth resources and market fluctuations. Secondly, as the use time goes by, the permanent magnets in the rare earth permanent magnet motor may experience magnetic field degradation. This degradation is mainly caused by the influence of the surrounding environment, mechanical wear and long-term operation, so it is difficult to avoid and easily affects the performance of the motor. In order to improve the running efficiency of the motor, compared with the prior art, through the implementation of this embodiment, the material-saving excitation mechanism 4 is set to apply the mixed magnetic technology to the magnetic-assisted synchronous reluctance motor. Compared with the conventional rare earth permanent magnet motor, on the one hand, the characteristics of the magnetic-assisted synchronous reluctance structure are utilized to fully utilize the reluctance torque and reduce the amount of permanent magnets. On the other hand, the mixed magnetic technology is adopted to mix the rare earth-free ferrite 43 and the rare earth-containing neodymium iron boron 42, which can further reduce the amount of rare earth permanent magnets. Under the same performance indicators, the amount of rare earth permanent magnets can be reduced by about half.

[0042] For further examples, please refer to Figure 1 , Figure 2 , Figures 6 to 10 As shown, the combined heat drive mechanism 5 includes a threaded ring 59 fixedly connected to the outer wall of the outer shell 1, the outer wall of the threaded ring 59 is threadedly connected to a fan 51, the outer wall of the outer shell 1 is equidistantly fixedly connected to a plurality of fins 52, the outer wall of the outer shell 1 is also fixedly connected to a cooling pipe 53, one end of the cooling pipe 53 is fixedly connected to a water inlet 54, and the other end of the cooling pipe 53 is fixedly connected to a water outlet 55.

[0043] The combined heat drive mechanism 5 also includes a second leaf door 57 fixedly connected to the edge of the inner wall of the outer shell 1. The side of the second leaf door 57 away from the shaft 2 is fixedly connected to a sliding column 512, and the sliding column 512 abuts against the fan 51. A plurality of grooves 515 are opened at the center of the second leaf door 57. The outer wall of the sliding column 512 is movably sleeved with the first leaf door 56. The side of the first leaf door 56 close to the second leaf door 57 is fixedly connected to a plurality of protrusions 516, and the outer wall of the protrusion 516 is clamped in the groove 515.

[0044] The combined heat drive mechanism 5 further comprises a plurality of sealing rings 514 , which are fixedly connected to a side of the first leaf door 56 close to the second leaf door 57 at equal intervals, and the outer wall of the sealing ring 514 is in contact with the second leaf door 57 .

[0045] The combined heat drive mechanism 5 also includes a block 510 fixedly connected to the edge of the first leaf door 56. A pair of slots 58 are provided on the side of the shell 1 close to the second leaf door 57. The block 510 is snapped into the slots 58. A pair of anti-slip blocks 513 are fixedly connected to the side of the first leaf door 56 away from the second leaf door 57.

[0046] The combined heat-driving mechanism 5 further comprises a mounting frame 511 fixedly connected to the inner wall of the outer shell 1 , and the shaft 2 rotatably penetrates the inner wall of the mounting frame 511 .

[0047] The cooling pipe 53 is laid on the housing 1 in a uniform and smoothly curved manner.

[0048] The water inlet 54 and the water outlet 55 are both fixedly connected to the external cooling system. The number of through holes formed on the first leaf door 56 and the second leaf door 57 is consistent, and the two can form a closed state after rotating and interlacing.

[0049] The effects achieved by this embodiment are as follows: In the prior art, a high temperature environment will cause the magnetic properties of permanent magnetic materials to decrease, and may even cause partial demagnetization. This performance degradation not only affects the efficiency and output power of the motor, but may also shorten the life of the motor. Compared with the prior art, through the implementation of this embodiment, a combined heat drive mechanism 5 is provided to be able to rotate and open and close the first leaf door 56, and under the joint action of the block 510, the slot 58, the protrusion 516, the groove 515 and the sealing ring 514, an independent sealing state is formed inside the housing 1 in a press-sealed manner to adapt to the requirements of the external environment, so that the staff can choose to dissipate heat by air cooling, water cooling and a combination of heat sinks, which is conducive to enhancing the versatility of the motor in different environments.

[0050] The complete usage steps and working principles of the above embodiment are as follows: in the initial state: the outer rotor core 41 is fixedly connected to the outer casing 1, the fan 51 is threadedly connected to the threaded ring 59, the first leaf door 56 and the second leaf door 57 are fitted and the positions of the through holes of the two remain in the same state, and the protrusion 516 is clamped in the groove 515.

[0051] When in use, the outer rotor core 41 is fixed to the inner wall of the outer shell 1 by fixing bolts 46, so that the outer shell 1 of the drum is directly used as the rotor yoke, the yoke part of the outer rotor core 41 is omitted, the amount of core material used is reduced, and the weight of the motor is reduced. At the same time, the material of the outer shell 1 has good magnetic conductivity to ensure the effective transmission and distribution of the magnetic field. Then, the second hole slot 45 and the first hole slot 44 are opened, and the two are distributed at intervals on the outer rotor core 41, which helps to reduce the overall weight of the outer rotor core 41 material. It is more suitable for some application scenarios with high weight requirements. It can not only improve the energy utilization efficiency of the equipment, but also improve the operating performance. The opening of the second hole slot 45 and the first hole slot 44 can also facilitate the outer rotor core 41 and the outer shell 1 to be connected. The connection and fixation not only improves the assembly efficiency, but also ensures the product quality, making the structure of the entire equipment more stable and reliable. At the same time, the opening of the second hole slot 45 and the first hole slot 44 can also increase the heat dissipation area of ​​the outer rotor core 41, thereby improving its heat dissipation performance. In high-power motors, it can ensure that the equipment can maintain a stable working state during long-term operation. In addition, since the setting quantity and circumferential corresponding positions of the ferrite 43 and the NdFeB 42 are consistent, and the volume of the NdFeB 42 is set smaller than the volume of the ferrite 43, the first hole slot 44 is opened on both sides of the NdFeB 42, which can effectively adjust the distribution of the magnetic field, so that the magnetic circuit design is more optimized, and the magnetic field is accurately controlled, thereby improving the anti-demagnetization ability of the ferrite 43 under the reverse magnetic field.

[0052] Please refer to the above working process Figures 1 to 5 .

[0053] Furthermore, since the number of through holes on the first leaf door 56 and the second leaf door 57 is consistent, and the two can form a closed state after rotating and staggering, when the external environment cannot be cooled by air cooling, the operator can rotate the fan 51 to remove it, and then hold the anti-detachment block 513 to pull the first leaf door 56 away from the second leaf door 57, so that the protrusion 516 is disengaged from the groove 515, and the block 510 is simultaneously disengaged from the limit of the groove 58, and then the first leaf door 56 is rotated on the slide column 512, so that the block 510 moves to another The first leaf door 56 is moved to the position of the card slot 58, and then the first leaf door 56 is pushed back in the direction of the second leaf door 57, so that the card block 510 is carded into another card slot 58 to complete the limit, and the protrusion 516 is also carded into the groove 515. At this time, the first leaf door 56 not only forms a staggered sealing state with the second leaf door 57 as it rotates, but also synchronously drives the sealing ring 514 to squeeze toward the through hole of the second leaf door 57, so that the sealing performance of the first leaf door 56 and the second leaf door 57 is enhanced, which is conducive to forming an independent sealing state inside the housing 1 to adapt to the requirements of the external environment. At this time The cooling and heat dissipation are achieved by combining the fins 52 and the cooling tubes 53. Since the cooling tubes 53 are laid on the housing 1 in a uniform and smoothly curved manner, and are connected to the external cooling system in conjunction with the water inlet 54 and the water outlet 55, the coolant can be circulated into the cooling tubes 53 and evenly take away the heat on the surface of the housing 1, thereby ensuring the constant temperature state of the motor and ensuring the stability of its operating efficiency. In addition, if it is not necessary to keep the inside of the motor sealed, the first leaf door 56 can be restored to its initial state, and the fan 51 can be added as a combined cooling method to greatly improve the cooling effect. When the motor is in a state where high-efficiency cooling is not required, the flow of liquid in the cooling tube 53 can be stopped by the external cooling system, and only the fan 51 and the fins 52 can be used as a cooling method to reduce power consumption. In summary, the operator can choose to dissipate heat by combining air cooling, water cooling and heat sinks. The specific heat dissipation method can be weighed according to factors such as the power density, working environment and cost of the motor, which is conducive to enhancing the versatility of the motor in different environments and reducing the phenomenon of high temperature causing the magnetic properties of magnetic materials to decrease.

[0054] Please refer to the above working process Figure 1 , Figure 2 , Figures 6 to 10 .

[0055] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hybrid excitation electric drum direct drive motor, comprising a housing (1), characterized in that: The center of the housing (1) is rotatably connected to a shaft (2), and the outer wall of the shaft (2) is rotatably connected to a stator core (3), and further comprises: a material-saving excitation mechanism (4) for mixing magnetism and reasonably arranging to reduce the amount of rare earth permanent magnets; a combined heat-driving mechanism (5) for combining different heat-driving methods in different environments; The material-saving excitation mechanism (4) comprises an outer rotor core (41) abutting against the inner wall of the outer shell (1), the inner wall of the outer rotor core (41) is provided with a plurality of pairs of first hole slots (44) equidistantly around the circumference, each pair of the first hole slots (44) is provided with a plurality of threaded holes near the outer shell (1), the first hole slots (44) and the positions of the corresponding threaded holes of the outer shell (1) are both threadedly connected with fixing bolts (46), the inner wall of the outer rotor core (41) is also provided with a plurality of pairs of second hole slots (45) equidistantly around the circumference, the second hole slots (45) and the first hole slots (44) are distributed on the outer rotor core (41) at intervals; The material-saving excitation mechanism (4) further comprises a plurality of NdFeBs (42) fixedly connected to the outer wall of the outer rotor core (41), the plurality of NdFeBs (42) being located on a side of each pair of second slots (45) close to the outer shell (1), a plurality of ferrites (43) being fixedly connected to the outer wall edge of the outer rotor core (41) close to the outer shell (1) at equal intervals, the number and circumferential corresponding positions of the ferrites (43) and the NdFeBs (42) being consistent, and the side of the ferrites (43) away from the NdFeBs (42) being in contact with the inner wall of the outer shell (1); The combined heat-driving mechanism (5) comprises a threaded ring (59) fixedly connected to the outer wall of the outer shell (1); the outer wall of the threaded ring (59) is threadedly connected to a fan (51); the outer wall of the outer shell (1) is fixedly connected to a plurality of fins (52) at equal intervals; the outer wall of the outer shell (1) is also fixedly connected to a cooling pipe (53); one end of the cooling pipe (53) is fixedly connected to a water inlet (54); and the other end of the cooling pipe (53) is fixedly connected to a water outlet (55).

2. A hybrid excitation electric drum direct drive motor according to claim 1, characterized in that: The combined heat-driving mechanism (5) further comprises a second leaf door (57) fixedly connected to the inner wall edge of the outer shell (1); a sliding column (512) is fixedly connected to the side of the second leaf door (57) away from the shaft (2); the sliding column (512) is in contact with the fan (51); a plurality of grooves (515) are provided at the center of the second leaf door (57); the first leaf door (56) is movably sleeved on the outer wall of the sliding column (512); a plurality of protrusions (516) are fixedly connected to the side of the first leaf door (56) close to the second leaf door (57); the outer walls of the protrusions (516) are snap-fitted into the grooves (515).

3. A hybrid excitation electric drum direct drive motor according to claim 2, characterized in that: The combined heat drive mechanism (5) further comprises a plurality of sealing rings (514), wherein the plurality of sealing rings (514) are fixedly connected to a side of the first leaf door (56) close to the second leaf door (57) at equal intervals, and an outer wall of the sealing ring (514) is in contact with the second leaf door (57).

4. A hybrid excitation electric drum direct drive motor according to claim 3, characterized in that: The combined heat-driving mechanism (5) further comprises a clamping block (510) fixedly connected to an edge of the first leaf door (56); a pair of clamping slots (58) are provided on a side of the housing (1) close to the second leaf door (57); the clamping block (510) is clamped in the clamping slots (58); and a pair of anti-slipping blocks (513) are fixedly connected to a side of the first leaf door (56) away from the second leaf door (57).

5. The hybrid excitation electric drum direct drive motor according to claim 1, characterized in that: The combined heat-driving mechanism (5) further comprises a mounting frame (511) fixedly connected to the inner wall of the outer shell (1), and the shaft (2) rotatably penetrates the inner wall of the mounting frame (511).

6. The hybrid excitation electric drum direct drive motor according to claim 1, characterized in that: The cooling pipe (53) is laid on the outer shell (1) in a uniform and smoothly curved manner.

7. The hybrid excitation electric drum direct drive motor according to claim 1, characterized in that: The volume of the neodymium iron boron (42) is set to be smaller than the volume of the ferrite (43).

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