A cooling structure and method for salient pole motor rotor pole coils

Abstract

The application discloses a cooling structure and method of a salient pole motor rotor magnetic pole coil, and belongs to the technical field of magnetic pole coil cooling design. The cooling structure comprises magnetic poles and magnetic pole support blocks which are fixed on a rotor rotating shaft at intervals. Each magnetic pole comprises at least one layer of magnetic pole coils which are fixedly wound on a pole body. The magnetic pole coils are separated by a plurality of insulating layers, and a busbar K4 is fixed between the insulating layers and the pole shoes. Along the radial direction of the rotor rotating shaft, a plurality of air ducts which can directly cool the magnetic pole coils are uniformly arranged on each insulating layer. The air ducts on both sides of each layer of magnetic pole coils are distributed in a staggered manner. The air inlet of the air duct communicates with an air inlet section on the rotor rotating shaft, the air outlets of the air ducts respectively communicate with the outside through the busbar K4 and the magnetic pole support blocks, and each air duct cooperatively cools the two sides of the magnetic pole coil. The technical problem of insufficient uniformity of the magnetic pole coil cooling is effectively solved, and the cooling effect of the magnetic pole coil is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of magnetic pole coil cooling design technology, and in particular to a cooling structure and method for a salient pole motor rotor magnetic pole coil. Background Technology

[0002] Salient-pole motors, due to their simple structure and reliable operation, are widely used in hydropower, pumped storage, and wind power generation. In the wind power sector, especially in direct-drive or semi-direct-drive high-speed wind power systems, the design of motors tends towards miniaturization and high power density due to constraints on nacelle installation space and cost. This directly leads to a significant increase in the heat generated per unit volume of the rotor pole coils, making cooling a growing concern. The ability to efficiently dissipate the heat lost from the rotor pole coils directly determines the upper limit of the current density selection and the potential for increasing the overall power density. Therefore, effectively improving the cooling effect of the rotor pole coils has become a key factor in enhancing the competitiveness of the wind turbine manufacturing industry.

[0003] The structure of a high-speed, small-sized salient-pole motor rotor typically consists of a shaft, magnetic poles, rotor leads connecting the pole coils, inter-pole supports, and other accessories. Each magnetic pole comprises a pole core, a pole coil, and insulation components. In existing technology, cooling of the rotor pole coils primarily employs inter-pole ventilation. This involves introducing cooling air between the poles, which then flows radially across the outer surface of the pole coil located in the inter-pole region. The air carries away heat through convection before leaving the rotor. The cooling effect of this method depends not only on external conditions such as airflow volume, air velocity, and air temperature, and the amount of heat loss from the pole coils, but most importantly on the surface area of ​​the rotor pole coils where heat exchange occurs with the air. All other things being equal, a larger surface area involved in heat exchange results in better cooling.

[0004] However, in actual structures, the aforementioned effective heat exchange area is severely limited by structural constraints. Because high-speed, small-sized salient-pole motors require numerous pole supports between the poles to ensure the lateral component of the centrifugal force of the pole coils and prevent them from flipping outwards, these supports occupy a significant amount of space in the inter-pole region. This drastically reduces the surface area of ​​the outer surface of the pole coils that participates in heat exchange, severely limiting heat dissipation capacity. This insufficient heat dissipation capacity directly limits the upper limit of the current density selection, thus restricting further increases in power density.

[0005] For example, Chinese patent document CN103715803A discloses a cooling structure for the magnetic pole winding of a salient-pole synchronous motor. Its technical solution involves opening a radial flow channel in the middle of the current-carrying busbar of the magnetic pole coil to cool the inside of the coil; simultaneously, cold air enters between the two magnetic poles through the air guide holes on the guide block to cool the outer surface of the magnetic pole coil. However, in this solution, the cold air is mainly concentrated in the middle region of the magnetic pole coil and the outer surface between the poles, while the inner surface of the magnetic pole coil adjacent to the pole body is not effectively cooled, resulting in insufficient cooling uniformity of the magnetic pole coil.

[0006] Therefore, how to overcome the limitation of the magnetic pole support block on the heat dissipation area and improve the cooling uniformity of the magnetic pole coil while ensuring that the magnetic pole coil has sufficient anti-centrifugal force and anti-overturning support is an urgent technical problem to be solved. Summary of the Invention

[0007] The purpose of this invention is to solve the above-mentioned problems existing in the prior art, and to provide a cooling structure and method for the rotor magnetic pole coil of a salient pole motor, which effectively solves the technical problem of insufficient cooling uniformity of the magnetic pole coil and significantly improves the cooling effect of the magnetic pole coil.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A cooling structure for the rotor magnetic pole coil of a salient pole motor includes magnetic poles and magnetic pole supports fixed at intervals on the rotor shaft. Each magnetic pole includes at least one layer of magnetic pole coil fixedly wound on the pole body. Each magnetic pole coil is separated by multiple insulating layers, and a busbar K4 is fixed between the insulating layers and the pole shoe. Along the radial direction of the rotor shaft, multiple air ducts that allow cold air to directly cool the magnetic pole coil are uniformly arranged on each insulating layer. The air ducts on both sides of each layer of magnetic pole coil are staggered. The air inlet of the air duct is connected to the air inlet section on the rotor shaft, and the air outlet of the air duct is connected to the outside through the busbar K4 and the magnetic pole support block, respectively. Each air duct cooperates to cool the two sides of the magnetic pole coil in sections.

[0009] When the magnetic pole coil has two layers, each magnetic pole includes an inner magnetic pole coil and an outer magnetic pole coil that are fixedly wound around the pole body. With the pole body as the inside, the inner magnetic pole coil is located inside the outer magnetic pole coil, and the outer magnetic pole coil is adjacent to the magnetic pole support block.

[0010] The insulating layer includes several insulating plates K1, each insulating plate K1 abutting between the inner magnetic pole coil and the outer magnetic pole coil, separating the inner magnetic pole coil and the outer magnetic pole coil. Its air duct is a cooling air duct M, which is formed by the gap between adjacent insulating plates K1. The air inlet of the cooling air duct M is connected to the air inlet section, and the air outlet is connected to the outside through the busbar K4.

[0011] The insulating layer also includes several insulating plates K2. Each insulating plate K2 abuts against the inner magnetic pole coil and the pole body. The insulating layer that separates the inner magnetic pole coil and the pole body has a cooling air duct N. The cooling air duct N is formed by the gap between adjacent insulating plates K2. The air inlet of the cooling air duct N is connected to the air inlet section, and the air outlet is connected to the outside through the busbar K4.

[0012] The magnetic pole support block includes an upper section and a lower section. The upper section extends beyond the lower section along the circumferential direction of the rotor shaft. The busbar K4 abuts against the bottom of the pole shoe and extends beyond the pole shoe along the circumferential direction of the rotor shaft to be adjacent to the upper section of the magnetic pole support block. The bottom of the busbar K4 simultaneously abuts against the inner magnetic pole coil, the outer magnetic pole coil, the insulating plate K1, and the insulating plate K2.

[0013] The busbar K4 has several ventilation slots along the circumferential direction of the rotor shaft, and ventilation holes corresponding to the cooling air ducts M and N are formed along the radial direction of the rotor shaft. The ventilation slots and ventilation holes are connected, and each ventilation slot is partially exposed outside the pole shoe when the busbar K4 extends beyond the pole shoe along the circumferential direction of the rotor shaft.

[0014] There is a ventilation gap between the busbar K4 and the upper section of the magnetic pole support block.

[0015] The insulating layer also includes an insulating plate K3. The outer side of the insulating plate K3 abuts against the lower section of the magnetic pole support block. The inner side of the insulating plate K3 is provided with several vertical protrusions, each of which abuts against the outer magnetic pole coil. The insulating layer separating the outer magnetic pole coil and the magnetic pole support block has a cooling air duct L. The cooling air duct L is formed by the gap between adjacent vertical protrusions. The air inlet of the cooling air duct L is connected to the air inlet section, and the air outlet is connected to the outside through the magnetic pole support block.

[0016] The upper section of the magnetic pole support block has slots that correspond one-to-one with the cooling air duct L.

[0017] The vertical protrusion protrudes from the inner side of the insulating plate K3 with a thickness of 15-30mm.

[0018] The cooling air ducts L, N, and M are staggered and distributed.

[0019] The cooling structure also includes axial flow fans installed at both ends of the magnetic pole axis for supplying cold air to the air inlet section.

[0020] A cooling method for the rotor magnetic pole coil of a salient pole motor is provided, which uses a cooling structure to control an axial flow fan to deliver cold air to the air inlet section. The cold air is cooled in sections on both sides of each magnetic pole coil through the air duct on the insulation layer. The cooled air after heat exchange is discharged to the outside through the busbar K4 and the magnetic pole support block.

[0021] The advantages of using this invention are: 1. In this invention, firstly, by uniformly setting multiple air ducts on each insulation layer and staggering the air ducts on both sides of each layer of magnetic pole coil, and using the busbar K4 and magnetic pole support blocks as air outlet channels respectively, under the premise of ensuring that the magnetic pole coil has sufficient anti-centrifugal force and anti-overturning support, cooling air can simultaneously enter from both sides of each layer of magnetic pole coil for cooling. This effectively overcomes the problem of insufficient heat dissipation area between poles due to the obstruction of magnetic pole support blocks, significantly improves the cooling coverage and uniformity, greatly increases the effective heat exchange area of ​​the magnetic pole coil, increases the upper limit of current density selection, and expands the space for increasing power density.

[0022] Secondly, the air inlet of the air duct is connected to the air inlet section on the rotor shaft, and the air outlet of the air duct is connected to the outside through the busbar K4 and the magnetic pole support block, respectively. This clearly defines the air inlet and outlet paths of the air duct and ensures the reliability of the magnetic pole coil cooling. It achieves zoned cooling of the magnetic pole coil on both sides along the circumference, significantly improving the cooling coverage and uniformity.

[0023] Compared to the existing technology where the cooling air only passes radially across the outer surface of the magnetic pole coil from the inter-pole region, this technology effectively avoids the limitation of a significant reduction in the outer heat dissipation area caused by the magnetic pole support block occupying the inter-pole space. Under the same air volume, it greatly increases the effective heat exchange area between the cooling air and the coil, significantly improving the utilization efficiency of the cooling air and the overall heat dissipation capacity of the magnetic pole coil.

[0024] Furthermore, compared with the prior art represented by publication number CN103715803A, this invention overcomes the shortcomings of the prior art, where cold air is concentrated only in the central region of the magnetic pole coil and the outer surface between the poles, resulting in the inner surface of the magnetic pole coil adjacent to the pole body not being effectively cooled, and it is also difficult to form zoned cooling for the two sides of the coil. Therefore, the cooling structure of this invention effectively solves the technical problem of insufficient cooling uniformity of the magnetic pole coil, significantly improves the cooling effect of the magnetic pole coil, and enhances the operational safety and stability of the salient pole motor rotor structure.

[0025] 2. In this invention, by setting the magnetic pole coil as a two-layer structure of inner magnetic pole coil and outer magnetic pole coil, and arranging the inner and outer layers with the pole body as the inside, each layer of magnetic pole coil has an independent cooling surface, which provides a structural basis for subsequent partitioned cooling of the inner and outer layers of coil.

[0026] 3. In this invention, by setting an insulating plate K1 between the inner magnetic pole coil and the outer magnetic pole coil, and forming a cooling air duct M by the gap between adjacent insulating plates K1, the outer side of the inner magnetic pole coil and the inner side of the outer magnetic pole coil can simultaneously obtain the flow of cold air, which further improves the uniformity of cooling of the magnetic pole coil.

[0027] 4. In this invention, by setting an insulating plate K2 between the inner magnetic pole coil and the pole body, and forming a cooling air channel N by the gap between adjacent insulating plates K2, the inner surface of the inner magnetic pole coil can be directly cooled by cold air. This overcomes the defect in the prior art that the inner surface of the magnetic pole coil cannot dissipate heat because it is in close contact with the pole body, further expands the effective heat exchange area of ​​the magnetic pole coil, and further improves the uniformity of cooling of the magnetic pole coil.

[0028] 5. In this invention, by setting the magnetic pole support block to extend beyond the lower section in the upper section circumferentially, and by making the busbar K4 extend beyond the pole shoe in the circumferential direction and be adjacent to the upper section of the magnetic pole support block, and by making the bottom of the busbar K4 simultaneously abut against the inner magnetic pole coil, the outer magnetic pole coil, the insulating plate K1, and the insulating plate K2, it is ensured that the busbar K4 can press and fix the multi-layer magnetic pole coil and the insulating layer, and also provides circumferential outlet space for the air of the busbar K4, thus effectively realizing the structural coordination of fixing function and ventilation function.

[0029] 6. In this invention, by setting interconnected ventilation slots and ventilation holes on the busbar K4, the cooling air is directionally guided inside the busbar K4, forming an orderly lateral flow path. Simultaneously, each ventilation slot is partially exposed above the pole shoe, ensuring that the cooling air, after flowing laterally along the ventilation slot, can be directly and smoothly discharged into the external space, avoiding problems of obstructed airflow or backflow. This structure clearly defines the outlet positions of the cooling air ducts M and N, ensuring the heat dissipation effect of the inner and outer magnetic pole coils.

[0030] 7. In this invention, by setting a ventilation gap between the upper side of the magnetic pole support block and the busbar K4, the air outlet area of ​​the cooling air ducts M, N and L at the air outlet is increased, so that the cooling air can be discharged more smoothly, avoiding the air volume reduction caused by the obstruction of the air outlet and improving the overall ventilation and heat dissipation efficiency.

[0031] 8. In this invention, by setting an insulating plate K3 and setting several vertical protrusions on the inner side of the insulating plate K3, and forming a cooling air channel L by the gap between adjacent vertical protrusions, the outer surface of the outer magnetic pole coil can be directly cooled by cold air. This overcomes the defect in the traditional scheme that the outer surface of the outer magnetic pole coil cannot effectively dissipate heat due to its proximity to the magnetic pole support block, and realizes active cooling of the outer surface of the outer magnetic pole coil, further improving the effective heat exchange area of ​​the magnetic pole coil.

[0032] 9. In this invention, by opening slots in the upper section of the magnetic pole support block that correspond one-to-one with the cooling air duct L, the gas cooled by the cooling air duct L on the outside of the outer magnetic pole coil can be directly discharged to the outside through the slots, forming a complete air intake-cooling-exhaust path, which ensures the reliability of cooling on the outside of the outer magnetic pole coil.

[0033] 10. In this invention, by designing the thickness of the vertical protrusions protruding from the inner side of the insulating plate K3 to be within the range of 15-30mm, it is ensured that the gap formed between adjacent vertical protrusions has sufficient ventilation cross section to form a stable cooling air duct L, while also taking into account the molding processability and structural reliability of the insulating plate K3.

[0034] If the thickness of the vertical protrusion is less than 15mm, the guiding effect will be insufficient, and the cooling air will easily generate turbulence in the gap, making it difficult to form a stable cooling air duct L. If the thickness is greater than 30mm, the excessive thickness of the vertical protrusion will encroach on the effective space between the pole body and the outer magnetic pole coil, affecting the assembly of the inner and outer magnetic pole coils. At the same time, stress concentration is easily generated at the root of the protrusion during hot pressing, affecting the long-term structural reliability of the insulation board K3.

[0035] 11. In this invention, by spatially staggering the distribution of cooling air ducts L, N, and M, the flow of each cooling air duct does not interfere with each other, avoiding short-circuiting or cross-flow between adjacent cooling air ducts. This ensures that the cooling area covered by each cooling air duct can obtain a stable and independent supply of cooling air, further improving the uniformity and reliability of zoned cooling.

[0036] 12. In this invention, by installing axial flow fans at both ends of the magnetic pole axis and actively supplying cold air to the air inlet section by the axial flow fans, a continuous and stable cold air power source is provided for the entire cooling structure, ensuring that each cooling duct can obtain sufficient cooling air volume under all operating conditions of the motor.

[0037] 13. In the cooling method of the present invention, by using the above-mentioned cooling structure and controlling the axial flow fan to deliver cold air to the air inlet section, the cold air is cooled in sections on both sides of each magnetic pole coil through the air duct on the insulation layer, and then discharged to the outside from the busbar K4 and the magnetic pole support block at the same time, forming multiple parallel and independent cooling paths. Each path corresponds to different surfaces and different areas of the magnetic pole coil, realizing all-round, multi-path parallel cooling of the magnetic pole coil. In a limited space, the heat dissipation potential of each surface of the magnetic pole coil is maximized, effectively improving the cooling effect and uniformity of the rotor magnetic pole coil. Attached Figure Description

[0038] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a cross-sectional structural schematic diagram showing the relationship between the axial flow fan and the cooling duct in this invention; Figure 3 This is a schematic diagram of the assembly structure of insulating plate K1, insulating plate K2 and insulating plate K3 in this invention; Figure 4 This is a schematic diagram of the structure of the busbar K4 in this invention; Figure 5 This is a schematic diagram of the structure of the insulating plate K3 in this invention; Figure 6 This is a schematic diagram of the structure of the first air path T1 in this invention; Figure 7 This is a schematic diagram of the structure of the second air path T2 in this invention; Figure 8 This is a schematic diagram of the third air path T3 in this invention; Figure 9 This is a schematic diagram of the structure of the magnetic pole support block in this invention.

[0039] The numbers in the diagram are as follows: 1. Magnetic pole core, 100. Magnetic pole coil, 2. Inner magnetic pole coil, 200. Insulation layer, 3. Outer magnetic pole coil, 300. Air duct, 4. Pole shoe, 5. Air inlet section, 6. Axial flow fan, 7. Magnetic pole support block, 8. Pole body, 9. Vertical protrusion, 10. Ventilation slot, 11. Ventilation hole, 12. Slot, 13. Ventilation gap. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0041] Example 1 This embodiment provides a cooling structure for the rotor magnetic pole coil of a salient pole motor, such as... Figures 1 to 3 , Figures 6 to 8 As shown, the cooling structure includes magnetic poles and magnetic pole support blocks 7 fixed at intervals on the rotor shaft. Each magnetic pole includes at least one layer of magnetic pole coil 100 fixedly wound on the pole body 8. Each magnetic pole coil 100 is separated by multiple insulating layers 200. The magnetic pole coils 100, the magnetic pole support blocks 7 and adjacent magnetic pole coils 100, and the magnetic pole core 1 of the magnetic pole and adjacent magnetic pole coils 100 are all insulated from each other by the insulating layers 200.

[0042] A busbar K4 is fixed between the insulating layer 200 and the pole shoe 4, and the insulating layer 200 is arranged perpendicular to the pole shoe 4. At the same time, the magnetic pole coil 100 is also insulated from the pole shoe 4 through the busbar K4.

[0043] Furthermore, along the radial direction of the rotor shaft, each insulation layer 200 is uniformly provided with multiple air ducts 300 that allow cold air to directly cool the magnetic pole coil 100. Figure 3 It is understood that the air ducts 300 on both sides of each layer of magnetic pole coil 100 are staggered, and the air inlet of the air duct 300 is connected to the air inlet section 5 on the rotor shaft. The air outlet of the air duct 300 is connected to the outside through the busbar K4 and the magnetic pole support block 7 respectively. Each air duct 300 works together to cool the two sides of the magnetic pole coil 100 in sections.

[0044] It should be noted that the "both sides" mentioned here refer to both sides of the magnetic pole coil 100 along the circumferential direction of the rotor. Furthermore, in this embodiment, the zoned cooling design of each air duct 300 on both sides of the magnetic pole coil 100 means that each air duct 300 is evenly spaced along the insulation layer 200 and corresponds to different areas on both sides of the magnetic pole coil 100. This allows cold air to simultaneously cover multiple areas on both sides of the magnetic pole coil 100, unlike traditional solutions where cold air is concentrated only on the outer surface or middle area between the poles of the magnetic pole coil.

[0045] Example 2 Based on Example 1, this embodiment optimizes the cooling structure when the magnetic pole coil 100 has two layers, inner and outer.

[0046] When the magnetic pole coil 100 has two layers, each magnetic pole includes an inner magnetic pole coil 2 and an outer magnetic pole coil 3 fixedly wound on the pole body 8, such as... Figure 1 As shown, with the pole body 8 of the magnetic pole core 1 as the inside, the inner magnetic pole coil 2 is located inside the outer magnetic pole coil 3, and the outer magnetic pole coil 3 is adjacent to the magnetic pole support block 7.

[0047] Both the inner magnetic pole coil 2 and the outer magnetic pole coil 3 are spirally stacked copper conductors, with insulating paper placed between each adjacent pair of copper conductors. The inner magnetic pole coil 2 and the outer magnetic pole coil 3 have the same number of turns in their spiral stack, and the main body of both the inner magnetic pole coil 2 and the outer magnetic pole coil 3 are frame-shaped structures. Since the winding and arrangement of the magnetic pole coils are known techniques, they will not be described in detail here.

[0048] Combination Figure 3 Understanding that the insulation layer 200 includes several insulation plates K1, each K1 abutting against the inner magnetic pole coil 2 and the outer magnetic pole coil 3, separating the inner magnetic pole coil 2 and the outer magnetic pole coil 3, its air duct 300 is a cooling air duct M, formed by the gaps between adjacent insulation plates K1. The air inlet of the cooling air duct M communicates with the air inlet section 5, and the air outlet of the cooling air duct M communicates with the outside through the manifold K4. Thus, as... Figure 6 As shown, the air inlet section 5, the cooling air duct M and the manifold K4 are connected to form the first air path T1, so as to perform zoned cooling on the outer side of the inner magnetic pole coil 2 and the inner side of the outer magnetic pole coil 3.

[0049] The insulation layer 200 also includes several insulating plates K2, each insulating plate K2 abutting between the inner magnetic pole coil 2 and the pole body 8 of the magnetic pole core 1, separating the inner magnetic pole coil 2 and the pole body 8. Its air duct 300 is a cooling air duct N, formed by the gaps between adjacent insulating plates K2. The air inlet of the cooling air duct N communicates with the air inlet section 5, and the air outlet of the cooling air duct N communicates with the outside through a manifold K4. Thus, as... Figure 7 As shown, the air inlet section 5, the cooling air duct N, and the manifold K4 are connected to form the second air path T2, which is used to perform zoned cooling on the inner side of the inner magnetic pole coil 2.

[0050] The magnetic pole support block 7 is arranged along the entire length of the rotor axially between adjacent magnetic poles and is fixed to the corresponding radial threaded hole on the shaft by a tie rod. Figure 1 Taking the direction shown as an example, the magnetic pole support block 7 includes an upper section and a lower section. The upper section of the magnetic pole support block 7 extends beyond the lower section along the circumferential direction of the rotor shaft. The busbar K4 abuts against the bottom of the pole shoe 4 and extends beyond the pole shoe 4 along the circumferential direction of the rotor shaft, adjacent to the upper section of the magnetic pole support block 7. The bottom of the busbar K4 simultaneously abuts against the inner magnetic pole coil 2, the outer magnetic pole coil 3, the insulating plate K1, and the insulating plate K2. Specifically, the thickness of the busbar K4 is J, and the dimension of the portion extending beyond the pole shoe 4 along the circumferential direction of the rotor shaft is denoted as D. This extended portion serves as the channel outlet for cold air to be discharged from the inside of the busbar K4 to the outside.

[0051] Furthermore, such as Figure 4 As shown, the manifold K4 has several ventilation slots 10 along the circumferential direction of the rotor shaft, and ventilation holes 11 corresponding to the cooling air ducts M and N are formed along the radial direction of the rotor shaft. The ventilation slots 10 and ventilation holes 11 are connected, and each ventilation slot 10 is partially exposed above the pole shoe 4 when the manifold K4 extends beyond the pole shoe 4 along the circumferential direction of the rotor shaft. Thus, after entering the manifold K4 through the cooling air ducts M and N, the cold air enters the corresponding ventilation slot 10 through the corresponding ventilation hole 11, flows along the circumferential direction of the rotor under the guidance of the ventilation slot 10, and is discharged to the outside from the part of the ventilation slot 10 exposed above the pole shoe 4.

[0052] The bottom surface of the upper section of the magnetic pole support block 7, which extends beyond the lower section, is on the same circumferential surface as the top surface of the outer magnetic pole coil 3, forming a gap C between the lower section of the magnetic pole support block 7 and the outer magnetic pole coil 3. Figure 5 It is understood that the insulation layer 200 also includes an integrally thermoformed insulation plate K3, which is placed within the gap C. Meanwhile, in the radial direction of the rotor, the inner magnetic pole coil 2, the outer magnetic pole coil 3, the insulation plate K1, the insulation plate K2, and the insulation plate K3 have the same radial dimensions. After assembly, their radial outer end faces are flush, i.e., located on the same circumferential surface.

[0053] With the pole body 8 as the inside, the outer side of the insulating plate K3 abuts against the lower section of the magnetic pole support block 7. The inner side of the insulating plate K3 is provided with several vertical protrusions 9, each of which abuts against the outer magnetic pole coil 3, and the thickness of the vertical protrusions 9 protruding from the inner side of the insulating plate K3 is 15-30mm.

[0054] On the insulating layer 200 separating the outer magnetic pole coil 3 and the magnetic pole support block 7, the air duct 300 is a cooling air duct L. The cooling air duct L is formed by the gap between adjacent vertical protrusions 9. The air inlet of the cooling air duct L is connected to the air inlet section 5, and the air outlet of the cooling air duct L is connected to the outside through the magnetic pole support block 7.

[0055] Specifically, such as Figure 9 As shown, the upper section of the magnetic pole support block 7 has slots 12 corresponding to the cooling air ducts L one-to-one. The cold air passing through the cooling air ducts L is discharged outwards through the slots 12. Thus, combined with... Figure 8 It is understood that the air inlet section 5, the cooling air duct L, and the slot 12 on the upper section of the magnetic pole support block 7 are connected to form the third air path T3, so as to perform zoned cooling on the outside of the outer magnetic pole coil 3.

[0056] Furthermore, such as Figure 3 As shown, cooling air ducts L, N, and M are staggered to ensure that the cooling areas corresponding to each air duct are interleaved, thereby improving cooling uniformity.

[0057] In addition, such as Figure 1 As shown, there is a ventilation gap 13 between the busbar K4 and the upper section of the magnetic pole support block 7. The design of the ventilation gap 13 increases the air outlet area of ​​the first air path T1, the second air path T2, and the third air path T3, thereby improving the ventilation and heat dissipation effect of the magnetic pole coil 100.

[0058] The cooling structure of the present invention also includes axial flow fans 6 installed at both ends of the magnetic pole axially for supplying cold air to the air inlet section 5. The axial flow fans 6 are fitted to the rotating shaft via a heat-shrink fitting. The cross-sectional structure of the outer ring of the axial flow fans 6, the arrangement of the blades, and the distance between the fan and the magnetic pole coil 100 are all set according to conventional ventilation requirements in the art, and are not specifically limited here. The axial ends of the magnetic pole support blocks 7 are respectively arranged flush with the outer ring of the axial flow fans 6; this is a conventional support and ventilation arrangement between the rotor magnetic poles, and will not be described further.

[0059] It should be noted that at the two ends corresponding to the rotor axis, namely at the wide edges of the inner magnetic pole coil 2 and the outer magnetic pole coil 3, the insulating plates K1 and K2 are designed with spacing, allowing the inner and outer sides of the inner magnetic pole coil 2 and the inner side of the outer magnetic pole coil 3 to directly contact the surrounding air for natural heat dissipation. Simultaneously, the outer side of the outer magnetic pole coil 3, being directly exposed, can also directly dissipate heat.

[0060] For cases with only a single-layer magnetic pole coil, the insulation plate K1 and cooling air duct M are removed, while the cooling structure between the insulation plate K1 and the busbar K4, and between the insulation plate K3 and the magnetic pole support block 7 are retained.

[0061] For cases with three or more magnetic pole coils, an insulating plate K1 is added between each pair of adjacent magnetic pole coils. The air duct on it forms a cooling air duct M and is connected to the busbar K4. At the same time, the cooling structure between the insulating plate K1 and the busbar K4, and between the insulating plate K3 and the magnetic pole support block 7 are maintained, so that the two sides of each magnetic pole coil can be cooled in sections.

[0062] In addition, insulating pads K5 are placed at the gaps between the inner magnetic pole coil 2 and the shaft, and at the gaps between the outer magnetic pole coil 3 and the shaft. The circumferential width of the insulating pad K5 at the inner magnetic pole coil 2 is the same as the cross-sectional width of the long side of the inner magnetic pole coil 2; the circumferential width of the insulating pad K5 at the outer magnetic pole coil 3 is the same as the cross-sectional width of the long side of the outer magnetic pole coil 3. The radial thickness of the insulating pad K5 is determined according to the corresponding gap dimensions to fill the gaps between the inner magnetic pole coil 2 and the shaft, and between the outer magnetic pole coil 3 and the shaft. The insulating pad K5 serves to enhance insulation and support the magnetic pole coils, but does not participate in the ventilation and cooling of the magnetic pole coils.

[0063] Example 3 In this embodiment, a cooling method for the rotor magnetic pole coil of a salient pole motor is provided. The method uses the cooling structure of the rotor magnetic pole coil of the salient pole motor in Embodiments 1 and 2. The axial flow fan 6 is controlled to deliver cold air to the air inlet section 5. The cold air is cooled on both sides of each magnetic pole coil 100 by the air duct 300 on the insulation layer 200. The cold air after heat exchange is discharged to the outside through the busbar K4 and the magnetic pole support block 7.

[0064] Specifically, combined Figures 6 to 8 Understanding: Axial flow fan 6 introduces cold air into inlet section 5. The cold air then flows through three channels: first channel T1, second channel T2, and third channel T3. The first stream of cold air cools the outer side of the inner magnetic pole coil 2 and the inner side of the outer magnetic pole coil 3 in separate zones. After heat exchange, the air is discharged to the outside through the busbar K4. The second stream of cold air cools the inner side of the inner magnetic pole coil 2 in sections, and after heat exchange, it is discharged to the outside through the busbar K4. The third stream of cold air cools the outer side of the outer magnetic pole coil 3 in sections, and after heat exchange, it is discharged to the outside through the slot 12 on the upper part of the magnetic pole support block 7.

[0065] The above description is merely a specific embodiment of the present invention. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All features or steps in the disclosed methods or processes may be combined in any way, except for mutually exclusive features and / or steps.

Claims

1. A cooling structure for the rotor magnetic pole coil of a salient-pole motor, characterized in that: It includes magnetic poles and magnetic pole support blocks (7) fixed at intervals on the rotor shaft. Each magnetic pole includes at least one layer of magnetic pole coil (100) fixedly wound on the pole body (8). Each magnetic pole coil (100) is separated by multiple insulating layers (200), and a busbar K4 is fixed between the insulating layer (200) and the pole shoe (4). Along the radial direction of the rotor shaft, multiple air ducts (300) that allow cold air to directly cool the magnetic pole coil (100) are uniformly arranged on each insulating layer (200). The air ducts (300) on both sides of each layer of magnetic pole coil (100) are staggered. The air inlet of the air duct (300) is connected to the air inlet section (5) on the rotor shaft. The air outlet of the air duct (300) is connected to the outside through the busbar K4 and the magnetic pole support block (7). Each air duct (300) cooperates to cool the magnetic pole coil (100) on both sides in sections.

2. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 1, characterized in that: When the magnetic pole coil (100) has two layers, each magnetic pole includes an inner magnetic pole coil (2) and an outer magnetic pole coil (3) that are fixedly wound on the pole body (8). With the pole body (8) as the inside, the inner magnetic pole coil (2) is located inside the outer magnetic pole coil (3), and the outer magnetic pole coil (3) is adjacent to the magnetic pole support block (7).

3. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 2, characterized in that: The insulating layer (200) includes several insulating plates K1. Each insulating plate K1 abuts between the inner magnetic pole coil (2) and the outer magnetic pole coil (3), separating the inner magnetic pole coil (2) and the outer magnetic pole coil (3). Its air duct (300) is a cooling air duct M. The cooling air duct M is formed by the gap between adjacent insulating plates K1. The air inlet of the cooling air duct M is connected to the air inlet section (5), and the air outlet is connected to the outside through the busbar K4.

4. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 3, characterized in that: The insulation layer (200) also includes several insulation plates K2. Each insulation plate K2 abuts between the inner magnetic pole coil (2) and the pole body (8). The insulation layer (200) that separates the inner magnetic pole coil (2) and the pole body (8) has a cooling air duct (300) N. The cooling air duct N is formed by the gap between adjacent insulation plates K2. The air inlet of the cooling air duct N is connected to the air inlet section (5), and the air outlet is connected to the outside through the busbar K4.

5. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 4, characterized in that: The magnetic pole support block (7) includes an upper section and a lower section. The upper section extends beyond the lower section along the circumferential direction of the rotor shaft. The busbar K4 abuts against the bottom of the pole shoe (4) and extends beyond the pole shoe (4) along the circumferential direction of the rotor shaft to be adjacent to the upper section of the magnetic pole support block (7). The bottom of the busbar K4 abuts against the inner magnetic pole coil (2), the outer magnetic pole coil (3), the insulating plate K1, and the insulating plate K2.

6. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 5, characterized in that: The busbar K4 has several ventilation slots (10) along the circumferential direction of the rotor shaft and ventilation holes (11) that correspond one-to-one with the cooling air ducts M and N along the radial direction of the rotor shaft. The ventilation slots (10) and ventilation holes (11) are connected. When the busbar K4 extends beyond the pole shoe (4) along the circumferential direction of the rotor shaft, each ventilation slot (10) is partially exposed outside the pole shoe (4).

7. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 6, characterized in that: There is a ventilation gap (13) between the busbar K4 and the upper section of the magnetic pole support block (7).

8. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 5, characterized in that: The insulating layer (200) also includes an insulating plate K3. The outer side of the insulating plate K3 abuts against the lower section of the magnetic pole support block (7). The inner side of the insulating plate K3 is provided with several vertical protrusions (9). Each vertical protrusion (9) abuts against the outer magnetic pole coil (3). On the insulating layer (200) separating the outer magnetic pole coil (3) and the magnetic pole support block (7), its air duct (300) is a cooling air duct L. The cooling air duct L is formed by the gap between adjacent vertical protrusions (9). The air inlet of the cooling air duct L is connected to the air inlet section (5), and the air outlet is connected to the outside through the magnetic pole support block (7).

9. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 8, characterized in that: The upper section of the magnetic pole support block (7) is provided with slots (12) that correspond one-to-one with the cooling air duct L.

10. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 8, characterized in that: The vertical protrusion (9) protrudes from the inner side of the insulating plate K3 with a thickness of 15-30mm.

11. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 8, characterized in that: The cooling air ducts L, N, and M are staggered and distributed.

12. The cooling structure for the rotor magnetic pole coil of a salient-pole motor according to claim 1, characterized in that: The cooling structure also includes axial flow fans (6) installed at both ends of the magnetic pole axis and used to deliver cold air to the air inlet section (5).

13. A cooling method for the rotor magnetic pole coil of a salient-pole motor, characterized in that: Using the cooling structure as described in any one of claims 1-12, the axial flow fan (6) is controlled to deliver cold air to the air inlet section (5). The cold air is cooled in sections on both sides of each layer of magnetic pole coil (100) through the air duct (300) on the insulation layer (200). The cold air after heat exchange is discharged to the outside through the busbar K4 and the magnetic pole support block (7).

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