A rotor spindle, rotor assembly and generator
By optimizing the rotor spindle structure through segmented design and material selection, the problems of severe load on the DE end and large overall deflection in large generators were solved, thereby improving generator performance and material utilization efficiency and simplifying the welding process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU YOUGU NEW ENERGY TECH CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-06-30
AI Technical Summary
Traditional rotor spindles are subjected to severe loads at the DE end in large-scale generators, resulting in large overall deflection and insufficient generator performance. Furthermore, improper selection of bearing specifications and dimensions leads to an excessively small air gap.
The rotor spindle adopts a segmented structure design, with the DE end shaft and the NDE end shaft made of steel of different sizes and materials. The outer diameter of the middle section is increased by expanding the ring plate and the cylinder to increase the overall rigidity, and ventilation openings are set in each part to meet the ventilation requirements.
It improves the load-bearing capacity and overall rigidity of the rotor spindle, reduces deflection, enhances the performance of the generator, simplifies the welding process, and meets ventilation requirements.
Smart Images
Figure CN224438697U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of generators, and in particular to a rotor spindle, rotor assembly, and generator. Background Technology
[0002] Currently, a typical horizontal generator in the wind power industry mainly consists of a stator frame, end covers, stator assembly, and rotor assembly. The stator assembly primarily comprises the stator core and stator windings, while the rotor assembly mainly consists of the rotor shaft, rotor core, and copper conductors, excitation sleeves, or magnets fixed to the core. The rotor shaft has two ends, DE and NDE. External driving torque is transmitted to the rotor core through the DE end shaft, and after electromagnetic conversion within the armature, this mechanical energy is converted into electrical energy. The NDE end shaft only bears the gravity and bending moment from the rotor core.
[0003] Traditionally, the rotor main shaft 1 is a single-piece shaft, comprising the DE end shaft body 11, the NDE end shaft body 12, and the intermediate section shaft 17, with the rotor core 3 mounted on the intermediate section shaft 17. As wind turbine generator units become increasingly larger, the generator rotor main shaft also tends to be larger, particularly with the increased outer diameter of the rotor core. This has led to a change in the structural form of the rotor main shaft 1 from the traditional single-piece shaft (…). Figure 1 As shown) along the integral axis of the stiffened plate 18 ( Figure 2 As shown, the stiffening plate 18 is welded around the circumference of the rotor main shaft 1, and the stiffening plate is installed on the middle section shaft 17. The rotor core 3 is installed outside the stiffening plate 18.
[0004] Both types of rotor spindles mentioned above have some problems:
[0005] 1. In addition to bearing the gravity and bending moment from the rotor core, the DE end also needs to transmit the working torque of the generator. The load conditions at the DE end are severe, which means that the overall load-bearing capacity of the rotor spindle needs to be improved.
[0006] 2. To save costs, the DE end bearing and the NDE end bearing are of the same specifications and have small dimensions (especially the inner diameter). This results in a small diameter of the middle section of the rotor shaft and the overall diameter, which leads to a large overall rotor deflection (up to 0.1-0.5mm in severe cases). This results in a very small air gap size when the generator is working, and the generator performance needs to be improved. Utility Model Content
[0007] To address the aforementioned technical problems, this application provides a rotor spindle, a rotor assembly, and a generator.
[0008] In one aspect, this application provides a rotor spindle.
[0009] The rotor spindle includes a DE end shaft, an NDE end shaft, a DE end ring plate, an NDE end ring plate, and a cylindrical body. The diameter of the DE end shaft is larger than the diameter of the NDE end shaft, and the length of the NDE end shaft is larger than the length of the DE end shaft. A slot for inserting the NDE end shaft is provided on the side of the DE end shaft near the NDE end shaft. The NDE end shaft is inserted into the slot and welded to the DE end shaft. The DE end ring plate is coaxially connected to the DE end shaft, and the NDE end ring plate is coaxially connected to the NDE end shaft. The outer circumferential surface of the DE end ring plate is flush with the outer circumferential surface of the NDE end ring plate. The cylindrical body is fixedly connected to both the DE end ring plate and the NDE end ring plate.
[0010] Preferably, a ventilation opening is provided on the DE end ring plate, and the ventilation opening is equidistantly arranged along the circumference of the DE end ring plate.
[0011] Preferably, the NDE end ring plate has a second ventilation opening, which is equidistantly arranged along the circumference of the NDE end ring plate.
[0012] Preferably, a baffle plate is provided at the middle position of the cylinder in the axial direction. The peripheral side wall of the baffle plate is fixedly connected to the inner peripheral wall of the cylinder. A clearance hole for the NDE end shaft to pass through is provided at the center of the baffle plate. A ventilation opening is provided on the peripheral side wall of the cylinder. Multiple ventilation openings are provided at equal intervals along the circumference of the cylinder on both sides of the baffle plate in the thickness direction.
[0013] Preferably, a DE end bearing is provided on the DE end shaft, and an NDE end bearing is provided on the NDE end shaft.
[0014] Secondly, this application provides a rotor assembly.
[0015] The rotor assembly includes a rotor spindle, on which a rotor core is disposed.
[0016] Thirdly, this application provides a generator.
[0017] The generator includes a rotor assembly, a stator core is disposed outside the rotor core of the rotor assembly, a stator winding is disposed on the stator core, and a cooling fan is disposed at both ends of the rotor main shaft.
[0018] Preferably, the generator further includes a stator frame, with annular DE end caps and NDE end caps respectively connected to both ends of the stator frame along its length. The inner peripheral wall of the DE end cap is fixedly connected to the outer peripheral wall of the DE end bearing, and the inner peripheral wall of the NDE end cap is fixedly connected to the outer peripheral wall of the NDE end bearing. An air inlet and an air outlet are provided on the top surface of the stator frame, with the air inlet located above the cooling fan and the air outlet located in the middle of the stator frame along its length.
[0019] In summary, this application includes at least one of the following beneficial technical effects:
[0020] 1. Depending on customer needs, the DE end shaft and NDE end shaft can be made of raw materials of different sizes and materials. The DE end shaft can be made of steel pipes or bars with larger cross-sectional diameters and better materials (such as alloy steel), while the NDE end shaft can be made of steel pipes or bars with smaller cross-sectional diameters and general materials (such as carbon steel, low alloy structural steel, etc.). The DE end ring plate and NDE end ring plate can also be made of plates of different thicknesses and materials according to the load conditions. The overall structure of the rotor main shaft has been optimized from the traditional integral shaft structure to a segmented shaft structure, which makes the load-bearing more reasonable and the material utilization better.
[0021] 2. Compared to welding a ring of stiffening plates on the middle section of the shaft, this application expands the outer diameter of the middle part of the rotor main shaft by using ring plates and cylinders. This not only allows it to accommodate rotor cores with larger outer diameters, but also results in less overall deflection of the rotor main shaft compared to traditional rotor main shafts, thus improving generator performance.
[0022] 3. The DE end ring plate and the NDE end ring plate are welded together using the cylinder wall, thus achieving the integrity of the entire rotor main shaft structure;
[0023] 4. Ventilation openings are made on the DE end ring plate, the NDE end ring plate, and the cylinder body to meet the ventilation requirements of the rotor assembly.
[0024] 5. Compared with traditional integral shafts with stiffeners, the rotor spindle structure in this application has fewer welds and a simpler welding process. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of a rotor spindle in the form of an integral shaft in the background art.
[0026] Figure 2 This is a schematic diagram of the structure of a rotor spindle with stiffeners in the background art.
[0027] Figure 3 This is a schematic diagram illustrating the structure of the rotor spindle in an embodiment of this application.
[0028] Figure 4 This is a cross-sectional structural diagram of the rotor spindle used in an embodiment of this application.
[0029] Figure 5 This is a schematic diagram illustrating the structure of the rotor assembly in an embodiment of this application.
[0030] Figure 6 This is a cross-sectional structural diagram of the generator used in the embodiments of this application.
[0031] Figure 7 This is a structural schematic diagram used in the embodiments of this application to illustrate the generator air inlet and outlet.
[0032] Explanation of reference numerals in the attached drawings: 1. Rotor main shaft; 11. DE end shaft; 111. DE end bearing; 112. Slot; 12. NDE end shaft; 121. NDE end bearing; 13. DE end ring plate; 131. Ventilation port one; 14. NDE end ring plate; 141. Ventilation port two; 15. Cylinder; 151. Ventilation port three; 16. Air baffle plate; 161. Clearance hole; 17. Intermediate section shaft; 18. Rib plate; 2. Rotor assembly; 3. Rotor core; 4. Generator; 5. Stator frame; 51. Air inlet; 52. Air outlet; 6. Stator core; 61. Stator winding; 7. Cooling fan; 8. DE end cover; 9. NDE end cover. Detailed Implementation
[0033] The following is in conjunction with the appendix Figure 3-7 This application will be described in further detail.
[0034] This application discloses a rotor spindle, a rotor assembly, and a generator.
[0035] In one aspect, this application provides a rotor spindle.
[0036] Reference Figure 3 , 4 The rotor main shaft 1 includes a DE end shaft 11, an NDE end shaft 12, a DE end ring plate 13, an NDE end ring plate 14, and a cylinder 15. The diameter of the DE end shaft 11 is larger than the diameter of the NDE end shaft 12, and the length of the NDE end shaft 12 is larger than the length of the DE end shaft 11. A slot 112 for inserting the NDE end shaft 12 is provided on the side of the DE end shaft 11 near the NDE end shaft 12. The NDE end shaft 12 is inserted into the slot 112 and welded to the DE end shaft 11. The DE end ring plate 13 is coaxially connected to the DE end shaft 11, and the NDE end ring plate 14 is coaxially connected to the NDE end shaft 12. The outer circumferential surface of the DE end ring plate 13 is flush with the outer circumferential surface of the NDE end ring plate 14. The cylinder 15 is fixedly connected to the DE end ring plate 13 and the NDE end ring plate 14. The DE end ring plate 13 and the NDE end ring plate 14 are welded together using the cylinder wall, thus achieving the integrity of the entire rotor main shaft 1 structure.
[0037] Depending on customer needs, the DE end shaft 11 and NDE end shaft 12 can be made of raw materials of different sizes and materials. The DE end shaft 11 can be made of steel pipes or steel bars with larger cross-sectional diameters and better materials (such as alloy steel), while the NDE end shaft 12 can be made of steel pipes or steel bars with smaller cross-sectional diameters and general materials (such as carbon steel, low alloy structural steel, etc.). The DE end ring plate 13 and NDE end ring plate 14 can also be made of plates of different thicknesses and materials according to the load conditions. The overall structure of the rotor main shaft 1 has been optimized from the traditional integral shaft structure to a segmented shaft structure, which makes the load-bearing more reasonable and the material utilization better.
[0038] Compared to welding a ring of stiffening plates 18 onto the middle section of the shaft 17, this application expands the outer diameter of the middle part of the rotor main shaft 1 by using a ring plate and a cylinder 15. This not only allows it to accommodate rotor cores 3 with larger outer diameters, but also results in less overall deflection of the rotor main shaft 1 compared to the conventional rotor main shaft 1, thus improving the performance of the generator 4.
[0039] Compared to the traditional integral shaft with stiffening plates 18, the rotor main shaft 1 structure in this application has fewer welds and a simpler welding process.
[0040] Ventilation openings 131 are provided on the DE end ring plate 13, and the ventilation openings 131 are equidistantly arranged along the circumference of the DE end ring plate 13.
[0041] The NDE end ring plate 14 has a second ventilation opening 141, which is equidistantly arranged along the circumference of the NDE end ring plate 14.
[0042] An air baffle 16 is provided at the middle position of the cylinder 15 along its axial direction. The peripheral wall of the air baffle 16 is fixedly connected to the inner peripheral wall of the cylinder 15, separating the airflow of the DE end shaft 11 and the NDE end shaft 12. The center of the air baffle 16 is provided with a clearance hole 161 for the NDE end shaft 12 to pass through. Ventilation openings 3 151 are provided on the peripheral wall of the cylinder 15. Multiple ventilation openings 3 151 are equidistantly provided on both sides of the air baffle 16 along the circumference of the cylinder 15 in the thickness direction.
[0043] Ventilation port 131 is made on the DE end ring plate 13, ventilation port 141 is made on the NDE end ring plate 14, and ventilation port 151 is made on the cylinder 15, to meet the ventilation requirements of the rotor assembly 2.
[0044] A DE end bearing 111 is provided on the DE end shaft 11, and an NDE end bearing 121 is provided on the NDE end shaft 12.
[0045] Secondly, this application provides a rotor assembly 2.
[0046] Reference Figure 5The rotor assembly 2 includes a rotor spindle 1, on which a rotor core 3 is mounted.
[0047] Thirdly, this application provides a generator 4.
[0048] Reference Figure 6 , 7 The generator 4 includes a rotor assembly 2 and a stator frame 5. The rotor core 3 of the rotor assembly 2 is provided with a stator core 6. The stator core 6 is provided with a stator winding 61. Cooling fans 7 are provided at both ends of the rotor main shaft 1. The cooling fans 7 are fixed on the rotor main shaft 1 and are located inside the stator frame 5.
[0049] The stator frame 5 has annular DE end caps 8 and NDE end caps 9 connected to its two ends along its length. The inner circumferential wall of the DE end cap 8 is fixedly connected to the outer circumferential wall of the DE end bearing 111, and the inner circumferential wall of the NDE end cap 9 is fixedly connected to the outer circumferential wall of the NDE end bearing 121. An air inlet 51 and an air outlet 52 are provided on the top surface of the stator frame 5. The air inlet 51 is located above the cooling fan 7, and the air outlet 52 is located in the middle of the stator frame 5 along its length.
[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A rotor spindle, characterized in that: The device includes a DE end shaft, an NDE end shaft, a DE end ring plate, an NDE end ring plate, and a cylindrical body. The diameter of the DE end shaft is larger than the diameter of the NDE end shaft, and the length of the NDE end shaft is larger than the length of the DE end shaft. A slot for inserting the NDE end shaft is provided on the side of the DE end shaft near the NDE end shaft. The NDE end shaft is inserted into the slot and welded to the DE end shaft. The DE end ring plate is coaxially connected to the DE end shaft, and the NDE end ring plate is coaxially connected to the NDE end shaft. The outer circumferential surface of the DE end ring plate is flush with the outer circumferential surface of the NDE end ring plate. The cylindrical body is fixedly connected to both the DE end ring plate and the NDE end ring plate.
2. The rotor spindle according to claim 1, characterized in that: A ventilation opening is provided on the DE end ring plate, and the ventilation opening is equidistantly arranged along the circumference of the DE end ring plate.
3. The rotor spindle according to claim 1, characterized in that: The NDE end ring plate is provided with a second ventilation opening, which is equidistantly arranged along the circumference of the NDE end ring plate.
4. The rotor spindle according to claim 1, characterized in that: A baffle plate is provided at the middle position of the cylinder in the axial direction. The peripheral side wall of the baffle plate is fixedly connected to the inner peripheral wall of the cylinder. A clearance hole is provided at the center of the baffle plate for the NDE end shaft to pass through. A ventilation opening is provided on the peripheral side wall of the cylinder. Multiple ventilation openings are provided at equal intervals along the circumference of the cylinder on both sides of the baffle plate in the thickness direction.
5. The rotor spindle according to claim 1, characterized in that: A DE end bearing is provided on the DE end shaft, and an NDE end bearing is provided on the NDE end shaft.
6. A rotor assembly, characterized in that: It includes the rotor spindle as described in claims 1-5, wherein a rotor core is provided on the rotor spindle.
7. A generator, characterized in that: The rotor assembly includes the rotor assembly described in claim 6, wherein a stator core is disposed outside the rotor core of the rotor assembly, a stator winding is disposed on the stator core, and a cooling fan is disposed at both ends of the rotor main shaft.
8. The generator according to claim 7, characterized in that: The generator also includes a stator frame, with annular DE end caps and NDE end caps connected to both ends of the stator frame along its length. The inner circumferential wall of the DE end cap is fixedly connected to the outer circumferential wall of the DE end bearing, and the inner circumferential wall of the NDE end cap is fixedly connected to the outer circumferential wall of the NDE end bearing. An air inlet and an air outlet are provided on the top surface of the stator frame. The air inlet is located above the cooling fan, and the air outlet is located in the middle of the stator frame along its length.