One-shaft composite permanent magnet motor driving system for air cooling island
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-05
- Publication Date
- 2026-03-13
AI Technical Summary
In traditional air-cooled island devices, the motor units generally adopt the structure of "variable frequency asynchronous motor + reducer". This has problems such as easy damage to the gears at the high-speed end of the reducer and oil leakage at the shaft extension end. In addition, the permanent magnet direct drive motor is large in size and heavy in weight, making it difficult to install and modify in the air-cooled island.
A single-axis composite permanent magnet motor drive system for air-cooled islands is designed. By optimizing the combined structure of the permanent magnet motor and the reduction gear transmission, the easily damaged high-speed parts are removed. Spline connection and thrust bearing are adopted, combined with thin oil lubrication, to reduce the system size and weight and improve the system stability and reliability.
It significantly improves the reliability and service life of the drive system, reduces the failure rate and maintenance costs, reduces downtime, simplifies the difficulty and cost of modification, and ensures the stable operation of the air-cooled island.
Smart Images
Figure CN121663885A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of single-axis composite permanent magnet motor drive technology for air-cooled islands, and in particular to a single-axis composite permanent magnet motor drive system for air-cooled islands. Background Technology
[0002] Air-cooled islands, as an important air cooling device, are usually equipped with dozens or even hundreds of motor units to drive fans to achieve efficient cooling. In traditional air-cooled island devices, the motor units generally adopt the structure of "variable frequency asynchronous motor + reducer". However, this traditional structure has some prominent problems. The high-speed gear of the reducer is prone to damage, and oil leakage often occurs at the shaft extension end. These faults not only affect the normal operation of the air-cooled island, but also increase the maintenance cost and downtime of the equipment.
[0003] To address the problems associated with traditional speed reducers, permanent magnet direct drive motors have gradually emerged in the market. While these motors have mitigated some of the failure issues of speed reducers, they also have significant drawbacks. Permanent magnet direct drive motors are bulky, heavy, and relatively expensive, posing numerous challenges for air-cooled island retrofit projects. Firstly, their large size may prevent installation within the existing space. Secondly, even if the installation space issue is overcome, their excessive weight can cause the original steel structure of the air-cooled island to exceed its design load-bearing capacity, thus hindering a complete overhaul of the entire air-cooled island system.
[0004] Therefore, in view of the shortcomings of the existing technology, it is necessary to provide a single-axis composite permanent magnet motor drive system for air-cooled islands to solve the shortcomings of the existing technology. Summary of the Invention
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a single-axis composite permanent magnet motor drive system for air-cooled islands. This single-axis composite permanent magnet motor drive system for air-cooled islands optimizes the combination structure of the permanent magnet motor and the reduction gear transmission part, removes the easily damaged high-speed part of the original drive system, reduces the number of failure points, significantly improves the reliability of the drive system, reduces the failure rate and maintenance cost of the equipment, reduces the downtime of the air-cooled island, and ensures the continuous and stable operation of the air-cooled island.
[0006] By organically combining the permanent magnet motor and the reduction gear transmission, and by connecting the permanent magnet motor shaft to the reduction gear transmission via the reduction sun gear, the size and weight of the drive system are effectively reduced. In the air-cooled island renovation project, the original drive system can be directly replaced without reinforcing the original steel structure, which reduces the difficulty and cost of the renovation, and also facilitates the installation and layout of the new air-cooled island project.
[0007] The reduction gear transmission is located at the end of the drive system, which extends the lever arm of the output shaft and improves the output shaft's anti-shake capability; the output bearing at the shaft extension end adopts a thrust bearing and is lubricated with thin oil, which effectively balances the bidirectional axial force and reduces vibration and noise; all key connection parts adopt spline connection, which ensures alignment and load-bearing capacity and helps to improve the stability of the drive system operation.
[0008] By using high-quality components and reasonable lubrication methods, friction, wear, and contamination of components are reduced, significantly extending the service life of each component in the drive system, thereby improving the service life of the entire drive system.
[0009] The above-mentioned objectives of the present invention are achieved by the following technical means.
[0010] A single-shaft composite permanent magnet motor drive system for air-cooled islands is provided, comprising an output shaft, a shaft extension end oil seal, a shaft extension end bearing outer cover, a flange end cover, a shaft extension end output bearing, a permanent magnet motor shaft extension end bearing, a permanent magnet motor stator, a permanent magnet motor rotor, a permanent magnet motor shaft, a non-shaft extension end bearing inner cover, a non-shaft extension end bearing inner cover oil seal, a permanent magnet motor non-shaft extension end bearing, a reduction internal gear ring, a reduction planetary gear, a reduction sun gear, a non-shaft extension end output bearing inner cover, a non-shaft extension end output bearing inner cover oil seal, an end cover, a non-shaft extension end output bearing, a non-shaft extension end output bearing outer cover, and a non-shaft extension end output bearing outer cover oil seal; The permanent magnet motor stator is fixedly installed inside the permanent magnet motor housing, and the permanent magnet motor rotor is sleeved on the outside of the permanent magnet motor shaft and fixedly connected to the permanent magnet motor shaft. The permanent magnet motor rotor is located inside the permanent magnet motor stator and forms an air gap. The shaft extension end of the permanent magnet motor shaft is rotatably connected to the flange end cover through the permanent magnet motor shaft extension end bearing, and the non-shaft extension end of the permanent magnet motor shaft is rotatably connected to the non-shaft extension end bearing inner cover through the permanent magnet motor non-shaft extension end bearing. The reduction sun gear is fixedly sleeved on the non-shaft extension end of the permanent magnet motor shaft, the reduction internal gear ring is fixedly installed on the inside of the end cover, the reduction planetary gear meshes with both the reduction sun gear and the reduction internal gear ring, and the reduction planetary gear is fixedly connected to one end of the output shaft. The shaft extension end passes through the shaft extension end output bearing, the flange end cover and the shaft extension end bearing outer cover in sequence, and the shaft extension end output bearing is embedded in the bearing chamber of the flange end cover and forms a rotational fit with the output shaft; The non-shaft extension end of the output shaft is rotatably connected to the end cover via the non-shaft extension end output bearing. The inner cover of the non-shaft extension end output bearing and the outer cover of the non-shaft extension end output bearing respectively cover both sides of the non-shaft extension end output bearing and are fixedly connected to the end cover. The oil seal at the shaft extension end is fitted at the mating point between the outer cover of the shaft extension end bearing and the output shaft. The oil seal at the inner cover of the non-shaft extension end bearing is fitted at the mating point between the inner cover of the non-shaft extension end bearing and the permanent magnet motor shaft. The oil seal at the inner cover of the non-shaft extension end output bearing is fitted at the mating point between the inner cover of the non-shaft extension end output bearing and the output shaft. The oil seal at the outer cover of the non-shaft extension end output bearing is fitted at the mating point between the outer cover of the non-shaft extension end output bearing and the output shaft.
[0011] The flange end cover is provided with two bearing chambers. One bearing chamber is used to install the output bearing at the shaft extension end, and the other bearing chamber is used to install the bearing at the shaft extension end of the permanent magnet motor. The inner side of the flange end cover is provided with a positioning stop that matches the stator of the permanent magnet motor. The end of the permanent magnet motor stator is embedded in the positioning stop and fixedly connected to the flange end cover.
[0012] The output shaft is connected to the reduction planetary gear via a spline, and the permanent magnet motor shaft is connected to the reduction sun gear via a spline.
[0013] The output bearing at the shaft extension end is a thrust bearing. The inner ring of the output bearing at the shaft extension end is interference-fitted with the output shaft, and the outer ring of the output bearing at the shaft extension end is interference-fitted with the bearing housing of the flange end cover.
[0014] The output bearing at the non-shaft extension end is a cylindrical roller bearing. The inner ring of the output bearing at the non-shaft extension end is interference-fitted with the output shaft, and the outer ring of the output bearing at the non-shaft extension end is interference-fitted with the bearing mounting hole of the end cover.
[0015] Both the shaft extension end bearing and the non-shaft extension end bearing of the permanent magnet motor are deep groove ball bearings. The inner ring of the shaft extension end bearing is interference-fitted with the permanent magnet motor shaft, and the outer ring of the shaft extension end bearing is interference-fitted with the bearing housing of the flange end cover. The inner ring of the non-shaft extension end bearing is interference-fitted with the permanent magnet motor shaft, and the outer ring of the non-shaft extension end bearing is interference-fitted with the bearing housing of the inner cover of the non-shaft extension end bearing.
[0016] The output shaft is arranged coaxially with the permanent magnet motor shaft, and there is a gap between them. The size of the gap is not less than 1.5 times the size of the air gap between the permanent magnet motor stator and the permanent magnet motor rotor.
[0017] The outer circumferential surface of the reduction gear ring is fixedly connected to the inner wall of the end cover, and the axis of the reduction gear ring coincides with the axis of the output shaft.
[0018] The inner cover of the non-shaft extension bearing is fixedly connected to the side of the flange end cover away from the shaft extension end, and the end cover is fixedly connected to the side of the inner cover of the non-shaft extension bearing away from the flange end cover.
[0019] The outer cover of the bearing at the shaft extension end is fixedly connected to the flange end cover on the side near the shaft extension end, and an assembly clearance is left between the center hole of the outer cover of the bearing at the shaft extension end and the output shaft.
[0020] This invention optimizes the combined structure of the permanent magnet motor and the reduction gear transmission, eliminating the easily damaged high-speed part of the original drive system, reducing failure points, significantly improving the reliability of the drive system, reducing the equipment failure rate and maintenance costs, reducing the downtime of the air-cooled island, and ensuring the continuous and stable operation of the air-cooled island.
[0021] By organically combining the permanent magnet motor and the reduction gear transmission, and by connecting the permanent magnet motor shaft to the reduction gear transmission via the reduction sun gear, the size and weight of the drive system are effectively reduced. In the air-cooled island renovation project, the original drive system can be directly replaced without reinforcing the original steel structure, which reduces the difficulty and cost of the renovation, and also facilitates the installation and layout of the new air-cooled island project.
[0022] The reduction gear transmission is located at the end of the drive system, which extends the lever arm of the output shaft and improves the output shaft's anti-shake capability; the output bearing at the shaft extension end adopts a thrust bearing and is lubricated with thin oil, which effectively balances the bidirectional axial force and reduces vibration and noise; all key connection parts adopt spline connection, which ensures alignment and load-bearing capacity and helps to improve the stability of the drive system operation.
[0023] By using high-quality components and reasonable lubrication methods, friction, wear, and contamination of components are reduced, significantly extending the service life of each component in the drive system, thereby improving the service life of the entire drive system. Attached Figure Description
[0024] The invention will be further described with reference to the accompanying drawings, but the contents of the drawings do not constitute any limitation on the invention.
[0025] Figure 1 This is a schematic diagram of the structure of a single-axis composite permanent magnet motor drive system for an air-cooled island according to the present invention.
[0026] from Figure 1 Including: 1. Output shaft; 2. Shaft extension end oil seal; 3. Shaft extension end bearing outer cover; 4. Flange end cover; 5. Shaft extension end output bearing; 6. Permanent magnet motor shaft extension end bearing; 7. Permanent magnet motor stator; 8. Permanent magnet motor rotor; 9. Permanent magnet motor shaft; 10. Non-shaft extension end bearing inner cover; 11. Non-shaft extension end bearing inner cover oil seal; 12. Permanent magnet motor non-shaft extension end bearing; 13. Reduction internal gear ring; 14. Reduction planetary gear; 15. Reduction sun gear; 16. Non-shaft extension end output bearing inner cover; 17. Non-shaft extension end output bearing inner cover oil seal; 18. End cover; 19. Non-shaft extension end output bearing; 20. Non-shaft extension end output bearing outer cover; 21. Non-shaft extension end output bearing outer cover oil seal. Detailed Implementation
[0027] The present invention will be further described in conjunction with the following embodiments.
[0028] Example 1: like Figure 1 As shown, a single-shaft composite permanent magnet motor drive system for an air-cooled island includes an output shaft 1, a shaft extension end oil seal 2, a shaft extension end bearing outer cover 3, a flange end cover 4, a shaft extension end output bearing 5, a permanent magnet motor shaft extension end bearing 6, a permanent magnet motor stator 7, a permanent magnet motor rotor 8, a permanent magnet motor rotating shaft 9, a non-shaft extension end bearing inner cover 10, a non-shaft extension end bearing inner cover oil seal 11, a permanent magnet motor non-shaft extension end bearing 12, a reduction internal gear ring 13, a reduction planetary gear 14, a reduction sun gear 15, a non-shaft extension end output bearing inner cover 16, a non-shaft extension end output bearing 19 inner cover oil seal 17, an end cover 18, a non-shaft extension end output bearing 19, a non-shaft extension end output bearing outer cover 20, and a non-shaft extension end output bearing outer cover oil seal 21.
[0029] The permanent magnet motor stator 7 is fixedly installed inside the permanent magnet motor housing, and the permanent magnet motor rotor 8 is sleeved on the outside of the permanent magnet motor shaft 9 and fixedly connected to the permanent magnet motor shaft 9. The permanent magnet motor rotor 8 is located inside the permanent magnet motor stator 7 and forms an air gap.
[0030] The shaft extension end of the permanent magnet motor shaft 9 is rotatably connected to the flange end cover 4 through the permanent magnet motor shaft extension end bearing 6, and the non-shaft extension end of the permanent magnet motor shaft 9 is rotatably connected to the non-shaft extension end bearing inner cover 10 through the permanent magnet motor non-shaft extension end bearing 12.
[0031] The reduction sun gear 15 is fixedly sleeved on the non-shaft extension end of the permanent magnet motor shaft 9, the reduction internal gear ring 13 is fixedly installed on the inner side of the end cover 18, the reduction planetary gear 14 meshes with both the reduction sun gear 15 and the reduction internal gear ring 13, and the reduction planetary gear 14 is fixedly connected to one end of the output shaft 1.
[0032] The shaft extension end of the output shaft 1 passes through the shaft extension end output bearing 5, the flange end cover 4, and the shaft extension end bearing outer cover 3 in sequence. The shaft extension end output bearing 5 is embedded in the bearing chamber of the flange end cover 4 and forms a rotational fit with the output shaft 1.
[0033] The non-shaft extension end of the output shaft 1 is rotatably connected to the end cover 18 via the non-shaft extension end output bearing 19. The inner cover 16 of the non-shaft extension end output bearing and the outer cover 20 of the non-shaft extension end output bearing respectively cover both sides of the non-shaft extension end output bearing 19 and are fixedly connected to the end cover 18.
[0034] The shaft extension end oil seal 2 is fitted into the mating point between the shaft extension end bearing outer cover 3 and the output shaft 1. The non-shaft extension end bearing inner cover oil seal 11 is fitted into the mating point between the non-shaft extension end bearing inner cover 10 and the permanent magnet motor shaft 9. The non-shaft extension end output bearing 19 inner cover oil seal 17 is fitted into the mating point between the non-shaft extension end output bearing inner cover 16 and the output shaft 1. The non-shaft extension end output bearing outer cover oil seal 21 is fitted into the mating point between the non-shaft extension end output bearing outer cover 20 and the output shaft 1.
[0035] The permanent magnet motor stator 7 is fixed inside the permanent magnet motor housing by bolts. The housing is connected to the external air-cooled island base and serves as the fixed reference for the entire system. The permanent magnet motor rotor 8 is fitted onto the outside of the permanent magnet motor shaft 9 with an interference fit. During assembly, the rotor is heated to expand its inner hole before being fitted onto the shaft. After cooling, a rigid connection is formed to ensure no relative slippage during rotation. The rotor is ultimately located inside the stator, with a uniform air gap reserved between them. This gap is a key space for the electromagnetic induction of the motor, which can prevent friction between the rotor and the stator and ensure efficient conversion of magnetic field energy.
[0036] The permanent magnet motor shaft 9 is supported by a "dual bearing support" design: the shaft extension end is connected to the flange end cover 4 through the permanent magnet motor shaft extension end bearing 6, the outer ring of the bearing is embedded in the special groove of the flange end cover 4, and the inner ring is tightly fitted with the shaft. The non-shaft extension end is connected to the non-shaft extension end bearing inner cover 10 through the permanent magnet motor non-shaft extension end bearing 12, the outer ring of the bearing is embedded in the groove of the non-shaft extension end bearing inner cover 10, and the inner ring is also fitted with the shaft. This dual support structure can limit the radial runout of the shaft, ensure the stable transmission of torque by the shaft, and avoid the bending deformation of the shaft caused by single-end support.
[0037] The reduction gear mechanism adopts a planetary gear system design. The reduction sun gear 15 is fixedly sleeved on the non-shaft extension end of the permanent magnet motor shaft 9 through an interference fit or key connection, and rotates synchronously with the shaft. The reduction internal gear ring 13 is fixed on the inner side of the end cover 18 through bolts or interference fit, serving as the fixed gear ring of the planetary gear system. The reduction planetary gear 14 meshes with the external teeth of the sun gear and the internal teeth of the internal gear ring, forming a transmission structure in which the sun gear is active, the planetary gears revolve, and the internal gear ring is fixed. The planetary gears are mounted on the planet carrier through pins or bearings. The planet carrier is welded or bolted to one end of the output shaft 1, realizing the transmission of power from the gear system to the output shaft 1.
[0038] The output shaft 1 is a power output terminal supported and installed through the shaft. Its shaft extension end passes through the shaft extension end output bearing 5, the flange end cover 4, and the shaft extension end bearing outer cover 3 in sequence. The shaft extension end output bearing 5 is embedded in the bearing chamber of the flange end cover 4, forming a rotational fit with the output shaft 1. It is used to support the output shaft 1 and bear the axial force transmitted from the fan. The flange end cover 4 is a transition connector, which not only supports the bearing but also connects the motor housing and external components. The shaft extension end bearing outer cover 3 covers the outside of the flange end cover 4 and is fixed by bolts to provide axial protection for the bearing.
[0039] The non-shaft extension end of the output shaft 1 is connected to the end cover 18 through the non-shaft extension end output bearing 19. The outer ring of the bearing is embedded in the mounting hole of the end cover 18, and the inner ring is in contact with the output shaft 1. The inner cover 16 and the outer cover of the non-shaft extension end output bearing are respectively covered on both sides of the bearing and fixed to the end cover 18 by bolts. The structure of the bearing and the double end cover 18 can limit the axial movement of the bearing and prevent external dust from entering the bearing.
[0040] The installation of sealing components focuses on preventing leakage and contamination. The shaft extension end oil seal 2 is embedded in the gap between the shaft extension end bearing outer cover 3 and the output shaft 1, with its lip in close contact with the outer circle of the output shaft 1 to prevent the bearing lubricating grease from leaking. The non-shaft extension end bearing inner cover oil seal 11 is embedded in the gap between the non-shaft extension end bearing inner cover 10 and the permanent magnet motor shaft 9 to isolate the motor cavity from the reduction gear cavity and prevent gear oil from seeping into the motor and affecting electromagnetic performance. The non-shaft extension end output bearing 19 inner cover oil seal 17 and outer cover oil seal are respectively embedded in the gaps between the corresponding inner cover, outer cover and output shaft 1 to prevent bearing lubricating grease from leaking or external impurities from entering.
[0041] Through the integrated installation design described above, the permanent magnet motor and the reduction gear are no longer independent components, but form a continuous power chain of motor power output - gear reduction and torque increase - output shaft 1 driving the fan. This eliminates the coupling between the motor and the reducer in the traditional split system, reduces the number of failure points, and also reduces the overall size.
[0042] The flange end cover 4 is provided with two bearing chambers. One bearing chamber is used to install the shaft extension end output bearing 5, and the other bearing chamber is used to install the permanent magnet motor shaft extension end bearing 6. The inner side of the flange end cover 4 is provided with a positioning stop that matches the permanent magnet motor stator 7. The end of the permanent magnet motor stator 7 is embedded in the positioning stop and fixedly connected to the flange end cover 4.
[0043] The flange end cover 4 is the central hub of the system. Two independent bearing chambers are machined on the flange end cover 4. One is used to install the output bearing 5 at the shaft extension end, and the other is used to install the permanent magnet motor shaft extension end bearing 6. The axes of the two bearing chambers are strictly coincident to ensure that the output shaft 1 and the permanent magnet motor shaft 9 rotate coaxially, avoiding vibration and bearing wear caused by axis misalignment.
[0044] The flange end cover 4 has a positioning stop that matches the permanent magnet motor stator 7 on the inner side. The stop is an annular groove. The end of the permanent magnet motor stator 7 can be accurately fitted into the groove. The stator and flange end cover 4 are then fixed by bolts. This positioning method can quickly calibrate the relative position of the stator and flange end cover 4, thereby ensuring the uniformity of the air gap between the stator and the rotor and avoiding magnetic field unevenness and motor efficiency reduction caused by stator offset.
[0045] The double bearing chamber and positioning stop design of the flange end cover 4 are key to ensuring the coaxiality of the system components. The higher the coaxiality, the smoother the operation of the shaft, gear, and output shaft 1, which can reduce vibration and noise, reduce the wear rate of bearings and gears, and indirectly extend the service life of the components.
[0046] The output shaft 1 is connected to the reduction planetary gear 14 via a spline, and the permanent magnet motor shaft 9 is connected to the reduction sun gear 15 via a spline.
[0047] The output shaft 1 and the reduction planetary gear 14, and the permanent magnet motor shaft 9 and the reduction sun gear 15 are all connected by splines. A spline is a tooth-like structure on the shaft and the hub. During assembly, the connection is achieved through tooth meshing. Compared with ordinary flat key connections, splines have a larger contact area, can transmit greater torque, and have better centering. The spline connection between the output shaft 1 and the planetary gear ensures that the planetary gear drives the output shaft 1 to rotate synchronously when it revolves, avoiding slippage. The spline connection between the shaft and the sun gear ensures that the torque of the shaft is completely transmitted to the sun gear, reducing energy loss.
[0048] The high load-bearing capacity and high centering of spline connections can avoid the problems of easy breakage and poor centering of traditional flat key connections, ensuring efficient power transmission in the gear system, reducing failures caused by connection failures, reducing vibration and noise, and improving system operation stability.
[0049] The output bearing 5 at the shaft extension end is a thrust bearing. The inner ring of the output bearing 5 at the shaft extension end is interference-fitted with the output shaft 1, and the outer ring of the output bearing 5 at the shaft extension end is interference-fitted with the bearing chamber of the flange end cover 4.
[0050] The bearing is installed with a double interference fit. The inner ring of the bearing is interference-fitted with the output shaft 1. During assembly, the inner ring needs to be pressed onto the output shaft 1 using a press to ensure no relative sliding. The outer ring of the bearing is interference-fitted with the bearing housing of the flange end cover 4. It is also installed into the flange end cover 4 using a press.
[0051] The core function of a thrust bearing is to withstand axial force. When an air-cooled island fan is running, it generates bidirectional axial force. The thrust bearing can effectively balance this force, preventing the axial force from being transmitted to the motor shaft or gears, thus preventing component deformation or damage. The double interference fit ensures that the bearing does not shift under load, further improving support stability.
[0052] The selection and interference fit design of the thrust bearing specifically solves the axial force problem of the air-cooled island fan, reduces failures caused by axial force, and ensures high bearing installation firmness, which can extend the bearing service life.
[0053] The non-shaft extension end output bearing 19 is a cylindrical roller bearing. The inner ring of the non-shaft extension end output bearing 19 is interference-fitted with the output shaft 1, and the outer ring of the non-shaft extension end output bearing 19 is interference-fitted with the bearing mounting hole of the end cover 18.
[0054] The output bearing 19 at the non-shaft extension end is a cylindrical roller bearing. Its installation also adopts a double interference fit. The inner ring is interference-fitted with the output shaft 1, and the outer ring is interference-fitted with the bearing mounting hole of the end cover 18. The advantage of cylindrical roller bearings is that they have strong radial load capacity. When the output shaft 1 is running, it will generate radial force. The cylindrical roller bearing can efficiently bear the radial force through the rolling contact between the rollers and the inner and outer rings, thus avoiding the output shaft 1 from bending due to radial force.
[0055] The cylindrical roller bearing and the thrust bearing form a comprehensive radial and axial support, respectively bearing the radial and axial forces of the output shaft 1. The division of labor is clear and the load-bearing capacity is strong, which can reduce the deformation and vibration of the output shaft 1 and ensure the stable operation of the fan.
[0056] Both the permanent magnet motor shaft extension end bearing 6 and the permanent magnet motor non-shaft extension end bearing 12 are deep groove ball bearings. The inner ring of the permanent magnet motor shaft extension end bearing 6 is interference-fitted with the permanent magnet motor shaft 9, and the outer ring of the permanent magnet motor shaft extension end bearing 6 is interference-fitted with the bearing chamber of the flange end cover 4. The inner ring of the permanent magnet motor non-shaft extension end bearing 12 is interference-fitted with the permanent magnet motor shaft 9, and the outer ring of the permanent magnet motor non-shaft extension end bearing 12 is interference-fitted with the bearing chamber of the non-shaft extension end bearing inner cover 10.
[0057] This installation method can limit the radial runout of the shaft to a very small range, ensuring a uniform air gap between the rotor and stator, avoiding friction between the rotor and stator caused by shaft wobbling, and reducing electromagnetic noise and energy loss during motor operation.
[0058] The double interference fit of deep groove ball bearings ensures stable operation of the motor shaft, reduces internal friction and wear, improves motor efficiency, and extends the service life of both the bearing and the motor.
[0059] The output shaft 1 is coaxially arranged with the permanent magnet motor shaft 9, and there is a gap between them. The size of the gap is not less than 1.5 times the size of the air gap between the permanent magnet motor stator 7 and the permanent magnet motor rotor 8.
[0060] This design can prevent friction between the output shaft 1 and the rotating shaft due to asynchronous rotation during operation, thus preventing component wear. Secondly, it provides installation space for the sealing components, ensuring that the oil seal can be smoothly installed in the gap and achieve reliable sealing.
[0061] The outer circumferential surface of the reduction gear ring 13 is fixedly connected to the inner wall of the end cover 18, and the axis of the reduction gear ring 13 coincides with the axis of the output shaft 1.
[0062] The outer circumferential surface of the internal gear ring 13 is fixedly connected to the inner wall of the end cover 18 by bolts or interference fit, and the axis of the internal gear ring is strictly coincident with the axis of the output shaft 1. This design can ensure that the meshing of the internal gear ring and the planetary gear is uniform. If the axis of the internal gear ring is offset, the meshing clearance between the planetary gear and the internal gear ring will vary, resulting in large transmission impact, high noise, and even gear jamming. Coaxial installation can keep the meshing clearance consistent, reducing gear wear and impact.
[0063] The coaxiality of the internal gear ring and the output shaft 1 directly affects the transmission smoothness of the planetary gear train, reduces the risk of gear failure, lowers noise, and extends the service life of the reduction mechanism.
[0064] The inner cover 10 of the non-shaft extension bearing is fixedly connected to the side of the flange end cover 4 away from the shaft extension end, and the end cover 18 is fixedly connected to the side of the inner cover 10 of the non-shaft extension bearing away from the flange end cover 4.
[0065] The inner cover 10 of the non-shaft extension end bearing is fixedly connected to the side of the flange end cover 4 away from the shaft extension end by bolts, forming a closed structure of the non-shaft extension end of the motor. At the same time, it provides an installation reference for the non-shaft extension end bearing 12 of the permanent magnet motor. The end cover 18 is then fixedly connected to the side of the inner cover 10 of the non-shaft extension end bearing away from the flange end cover 4 by bolts, completely enclosing the reduction gear mechanism inside.
[0066] This progressive connection of flange end cover 4 - non-shaft extension end bearing inner cover 10 - end cover 18 allows each housing component to form a complete enclosed space, protecting the motor and reduction mechanism from external environmental influences and ensuring the coaxiality of each component. Even if disassembled for maintenance, reassembly can be quickly performed through bolt holes to ensure installation accuracy.
[0067] The progressive connection design balances sealing and assembly precision, preventing dust and moisture from entering the system while simplifying the reinstallation process after maintenance, reducing failures caused by assembly deviations, and improving system reliability.
[0068] The outer cover 3 of the shaft extension bearing is fixedly connected to the side of the flange end cover 4 near the shaft extension end, and there is an assembly gap between the center hole of the outer cover 3 of the shaft extension bearing and the output shaft 1.
[0069] The bearing outer cover 3 at the shaft extension end is fixedly connected to the flange end cover 4 near the shaft extension end by bolts. The size of the pre-reserved assembly gap between its center hole and the output shaft 1 is such that it does not affect the rotation of the output shaft 1 and can accommodate the oil seal. The purpose of this design is to avoid direct contact between the bearing outer cover and the output shaft 1. If there is no gap between the two, the output shaft 1 will rub against the outer cover when it rotates, resulting in wear and heat generation of the components. The reserved gap allows the output shaft 1 to rotate freely, while providing installation space for the shaft extension end oil seal 2 to ensure the sealing effect.
[0070] Allowing for pre-existing assembly gaps can prevent frictional heat generation from the outset, reduce component wear, and provide conditions for sealing, thereby further improving system stability and service life.
[0071] This invention optimizes the combined structure of the permanent magnet motor and the reduction gear transmission, eliminating the easily damaged high-speed part of the original drive system, reducing failure points, significantly improving the reliability of the drive system, reducing the equipment failure rate and maintenance costs, reducing the downtime of the air-cooled island, and ensuring the continuous and stable operation of the air-cooled island.
[0072] By organically combining the permanent magnet motor and the reduction gear transmission, and by connecting the permanent magnet motor shaft 9 to the reduction gear transmission via the reduction sun gear 15, the size and weight of the drive system are effectively reduced. In the air-cooled island renovation project, the original drive system can be directly replaced without reinforcing the original steel structure, which reduces the difficulty and cost of the renovation, and also facilitates the installation and layout of the new air-cooled island project.
[0073] The reduction gear transmission is located at the end of the drive system, which extends the lever arm of the output shaft 1 and improves the anti-shake capability of the output shaft 1; the output bearing 5 at the shaft extension end adopts a thrust bearing and is lubricated with thin oil, which effectively balances the bidirectional axial force and reduces vibration and noise; the key connection parts adopt spline connection, which ensures alignment and load-bearing capacity and helps to improve the stability of the drive system operation.
[0074] By using high-quality components and reasonable lubrication methods, friction, wear, and contamination of components are reduced, significantly extending the service life of each component in the drive system, thereby improving the service life of the entire drive system.
[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.
Claims
1. A single-axis composite permanent magnet motor drive system for air-cooled islands, characterized in that: This includes output shaft, shaft extension end oil seal, shaft extension end bearing outer cover, flange end cover, shaft extension end output bearing, permanent magnet motor shaft extension end bearing, permanent magnet motor stator, permanent magnet motor rotor, permanent magnet motor shaft, non-shaft extension end bearing inner cover, non-shaft extension end bearing inner cover oil seal, permanent magnet motor non-shaft extension end bearing, reduction internal gear ring, reduction planetary gear, reduction sun gear, non-shaft extension end output bearing inner cover, non-shaft extension end output bearing inner cover oil seal, end cover, non-shaft extension end output bearing, non-shaft extension end output bearing outer cover, and non-shaft extension end output bearing outer cover oil seal; The permanent magnet motor stator is fixedly installed inside the permanent magnet motor housing, the permanent magnet motor rotor is sleeved outside the permanent magnet motor shaft and fixedly connected to the permanent magnet motor shaft, and the permanent magnet motor rotor is located inside the permanent magnet motor stator and forms an air gap; The shaft extension end of the permanent magnet motor shaft is rotatably connected to the flange end cover through the permanent magnet motor shaft extension end bearing, and the non-shaft extension end of the permanent magnet motor shaft is rotatably connected to the non-shaft extension end bearing inner cover through the permanent magnet motor non-shaft extension end bearing. The reduction sun gear is fixedly sleeved on the non-shaft extension end of the permanent magnet motor shaft, the reduction internal gear ring is fixedly installed on the inner side of the end cover, the reduction planetary gear meshes with both the reduction sun gear and the reduction internal gear ring, and the reduction planetary gear is fixedly connected to one end of the output shaft; The shaft extension end of the output shaft passes sequentially through the shaft extension end output bearing, the flange end cover, and the shaft extension end bearing outer cover, and the shaft extension end output bearing is embedded in the bearing chamber of the flange end cover and forms a rotational fit with the output shaft; The non-shaft extension end of the output shaft is rotatably connected to the end cover through the non-shaft extension end output bearing. The inner cover and the outer cover of the non-shaft extension end output bearing respectively cover both sides of the non-shaft extension end output bearing and are fixedly connected to the end cover. The shaft extension end oil seal is fitted at the mating point between the outer cover of the shaft extension end bearing and the output shaft; the non-shaft extension end bearing inner cover oil seal is fitted at the mating point between the inner cover of the non-shaft extension end bearing and the permanent magnet motor shaft; the non-shaft extension end output bearing inner cover oil seal is fitted at the mating point between the inner cover of the non-shaft extension end output bearing and the output shaft; and the non-shaft extension end output bearing outer cover oil seal is fitted at the mating point between the outer cover of the non-shaft extension end output bearing and the output shaft.
2. The single-axis composite permanent magnet motor drive system for air-cooled islands according to claim 1, characterized in that: The flange end cover is provided with two bearing chambers, one bearing chamber is used to install the shaft extension end output bearing, and the other bearing chamber is used to install the permanent magnet motor shaft extension end bearing. The inner side of the flange end cover is provided with a positioning stop that matches the permanent magnet motor stator. The end of the permanent magnet motor stator is embedded in the positioning stop and fixedly connected to the flange end cover.
3. The single-axis composite permanent magnet motor drive system for air-cooled islands according to claim 2, characterized in that: The output shaft is connected to the reduction planetary gear via a spline, and the permanent magnet motor shaft is connected to the reduction sun gear via a spline.
4. The single-axis composite permanent magnet motor drive system for air-cooled islands according to claim 3, characterized in that: The output bearing at the shaft extension end is a thrust bearing. The inner ring of the output bearing at the shaft extension end is interference-fitted with the output shaft, and the outer ring of the output bearing at the shaft extension end is interference-fitted with the bearing housing of the flange end cover.
5. A single-axis composite permanent magnet motor drive system for an air-cooled island according to claim 4, characterized in that: The non-shaft extension end output bearing is a cylindrical roller bearing. The inner ring of the non-shaft extension end output bearing is interference-fitted with the output shaft, and the outer ring of the non-shaft extension end output bearing is interference-fitted with the bearing mounting hole of the end cover.
6. A single-axis composite permanent magnet motor drive system for an air-cooled island according to claim 5, characterized in that: Both the permanent magnet motor shaft extension end bearing and the permanent magnet motor non-shaft extension end bearing are deep groove ball bearings. The inner ring of the permanent magnet motor shaft extension end bearing is interference-fitted with the permanent magnet motor shaft, and the outer ring of the permanent magnet motor shaft extension end bearing is interference-fitted with the bearing housing of the flange end cover. The inner ring of the permanent magnet motor non-shaft extension end bearing is interference-fitted with the permanent magnet motor shaft, and the outer ring of the permanent magnet motor non-shaft extension end bearing is interference-fitted with the bearing housing of the inner cover of the non-shaft extension end bearing.
7. A single-axis composite permanent magnet motor drive system for an air-cooled island according to claim 6, characterized in that: The output shaft is coaxially arranged with the permanent magnet motor shaft, and there is a gap between them. The size of the gap is not less than 1.5 times the size of the air gap between the permanent magnet motor stator and the permanent magnet motor rotor.
8. A single-axis composite permanent magnet motor drive system for an air-cooled island according to claim 7, characterized in that: The outer circumferential surface of the reduction gear ring is fixedly connected to the inner wall of the end cover, and the axis of the reduction gear ring coincides with the axis of the output shaft.
9. A single-axis composite permanent magnet motor drive system for an air-cooled island according to claim 8, characterized in that: The inner cover of the non-shaft extension end bearing is fixedly connected to the side of the flange end cover away from the shaft extension end, and the end cover is fixedly connected to the side of the inner cover of the non-shaft extension end bearing away from the flange end cover.
10. A single-axis composite permanent magnet motor drive system for an air-cooled island according to claim 9, characterized in that: The outer cover of the shaft extension bearing is fixedly connected to the side of the flange end cover near the shaft extension end, and an assembly gap is left between the center hole of the outer cover of the shaft extension bearing and the output shaft.