Variable-speed pumped storage motor-generator with an electric axial-centrifugal radial-axial supercharging end ventilation system

Abstract

The present invention discloses a variable-speed pumped-storage power generation motor with an electric axial-centrifugal radial-axial supercharging end ventilation system, which relates to the field of motors. The present invention aims to solve the problem of high temperature of the end components of the existing power generation motor. The air guide plate is installed on the rotating shaft, the centrifugal fan is installed on both sides of the outer fixing plate of the rotor, the electric axial-centrifugal fan is installed on both sides of the rotor finger, the axial blades in the electric axial-centrifugal fan can be electrically adjusted according to the rotation direction and speed, the inclined wind baffle is installed outside the electric axial-centrifugal fan, the outer retaining ring of the rotor is provided with n air guide teeth along the circumferential direction, the outer retaining ring of the rotor is provided with a first-stage radial ventilation opening, a second-stage radial ventilation opening and a third-stage radial ventilation opening along the axial direction, the rotor single-stage axial-flow fan is installed on the rotating shaft, and a multi-stage segmented supercharging ventilation channel steel is installed in the rotor radial ventilation groove. The present invention improves the end ventilation and cooling capacity of the power generation motor, has a simple structure and is easy to implement.

Description

Technical Field

[0001] The present invention relates to a variable-speed pumped-storage power generation motor with an electric axial-centrifugal radial-axial supercharging end ventilation system, belonging to the field of electric machines. Background Art

[0002] With the continuous development of the national economy, electric power has increasingly become an important energy and material basis for various industries in society. The large-scale construction of pumped-storage power stations can effectively promote the consumption of new energy, reduce the overall system energy consumption, and ensure the safe and stable operation of the power grid. As a key component of such power stations, almost all pumped-storage power generation motors are rotor direct-current excited constant-speed pumped-storage power generation motors. Conventional pumped-storage power generation motors in pumped-storage power stations with large head variations have problems such as low water turbine efficiency, increased cavitation, increased wear and vibration, and are insufficient to meet the urgent demand for large-scale and rapid power fluctuations that have occurred in the power grid in recent years. Moreover, due to some unreasonable ventilation and cooling designs of this type of motor, the heat of each component in the stator region and the rotor region cannot be taken away in time during its operation, resulting in a sharp rise in the temperatures of the stator end windings, rotor end windings, rotor retaining rings, and end components, even exceeding the allowable temperature rise, seriously threatening the safe and stable operation of the pumped-storage power generation motor.

[0003] In order to effectively reduce the overall temperature of a pumped-storage power generation motor and make full use of the air volume inside the power generation motor to effectively carry away the heat of each component, a new type of variable-speed pumped-storage power generation motor and its efficient ventilation and cooling system can be adopted to effectively solve the problems of insufficient operating performance and relatively high temperature of traditional constant-speed pumped-storage power generation motors. The centrifugal fan component in the new type of electric axial-flow - centrifugal fan inside the variable-speed pumped-storage power generation motor is used to increase the flow rate and pressure of the cooling gas in the radial direction. At the same time, the cooling gas enters between the rotor outer guard ring and the rotor inner guard ring along the inclined wind deflector under the action of the electric axial-flow fan component in the electric axial-flow - centrifugal fan, directly cooling the rotor end winding, accelerating the flow velocity of the fluid around the rotor end winding, increasing the surface heat dissipation coefficient of the rotor end winding, and effectively reducing the temperature of the rotor end winding; through the radial ventilation openings of the rotor outer guard ring and the air guiding teeth on the outer surface of the rotor outer guard ring, the contact area between the cooling gas and the rotor outer ring is increased, further increasing the flow velocity and pressure of the cooling gas, accelerating the flow velocity of the fluid around the rotor outer guard ring, the rotor end winding, and the stator end winding, and effectively reducing the temperatures of the rotor outer guard ring, the rotor end winding, and the stator end winding; the variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system described in the present invention can effectively improve the cooling effect in the stator and rotor end regions, increase the flow rate and flow velocity of the cooling gas in the stator and rotor end regions, especially reduce the temperatures of the rotor outer guard ring, the rotor end winding, and the stator end winding with serious heat generation, improve the utilization rate of the cooling gas, and enhance the ability of the variable-speed pumped-storage power generation motor to operate safely and stably. Summary of the Invention

[0004] The object of the present invention is to provide a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system to solve the problem of excessive temperatures of the rotor outer guard ring, the rotor end winding, and the stator end winding caused by unreasonable ventilation and cooling design in the end region of the variable-speed pumped-storage power generation motor, thereby increasing the total fluid flow rate in the stator and rotor end regions of the variable-speed pumped-storage power generation motor, accelerating the fluid flow velocity in the stator and rotor end regions, and improving the ability of the variable-speed pumped-storage power generation motor to operate safely and stably in the long term.

[0005] The variable-speed pumped-storage power generation motor with an electric axial-centrifugal radial-axial supercharging end ventilation system of the present invention includes a cooler, a stator bracket, stator positioning ribs, a stator core, stator core radial ventilation ducts, a rotor core, rotor core radial ventilation ducts, an electric axial-centrifugal fan, a centrifugal fan, a rotor outer fixing plate, a guide vane, a rotating shaft, a stator retaining ring, stator pressing fingers, stator end windings, a rotor outer retaining ring, rotor end windings, an inclined wind deflector, rotor pressing fingers, a rotor inner retaining ring, a casing, a rotor single-stage axial-flow fan, a multi-stage segmented supercharging ventilation channel steel, guide teeth, a rotor outer retaining ring radial ventilation opening, a supercharging axial-flow fan, and ventilation holes. Stator core radial ventilation ducts are provided in the stator core; rotor core radial ventilation ducts are provided in the rotor core; the electric axial-centrifugal fan is composed of an electric axial-flow fan and a centrifugal fan connected to each other; the rotor outer retaining ring radial ventilation opening is composed of a first-stage radial ventilation opening, a second-stage radial ventilation opening, and a third-stage radial ventilation opening; the multi-stage segmented supercharging ventilation channel steel is composed of a first-stage supercharging ventilation channel steel, a second-stage supercharging ventilation channel steel, and a third-stage supercharging ventilation channel steel. The guide vane is installed on the rotating shaft, the centrifugal fan is installed on both sides of the rotor outer fixing plate, the electric axial-centrifugal fan is installed on both sides of the rotor pressing fingers, the axial-flow blades in the electric axial-centrifugal fan can be electrically adjusted according to the rotation direction and speed, the inclined wind deflector is installed outside the electric axial-centrifugal fan, the rotor outer retaining ring is provided with n guide teeth along the circumferential direction, the rotor outer retaining ring is provided with a first-stage radial ventilation opening, a second-stage radial ventilation opening, and a third-stage radial ventilation opening along the axial direction, the rotor single-stage axial-flow fan is installed on the rotating shaft, and the multi-stage segmented supercharging ventilation channel steel is installed in the rotor radial ventilation ducts.

[0006] The number n of guide teeth provided along the circumferential direction of the rotor outer retaining ring is 80 to 120; the width of the stator core radial ventilation duct is 3 mm to 7 mm; the width of the rotor core radial ventilation duct is 3 mm to 7 mm; the width of the first-stage radial ventilation opening provided in the rotor outer retaining ring is 10 to 20 mm; the width of the second-stage radial ventilation opening is 20 to 30 mm; the width of the third-stage radial ventilation opening is 30 to 40 mm; the included angle a between the electric axial-flow fan and the centrifugal fan in the electric axial-centrifugal fan is -40° to 40°; the radial height of the guide teeth on the outer surface of the rotor outer retaining ring is 10 mm to 20 mm.

[0007] Preferably, a fourth-stage radial ventilation opening and a fifth-stage radial ventilation opening are newly provided along the axial direction of the rotor outer retaining ring, increasing the contact area between the rotor outer retaining ring and the cooling gas and further reducing the maximum temperature of the rotor outer retaining ring.

[0008] Preferably, the single-stage axial-flow fan of the rotors on both sides of the rotating shaft is adjusted to a pressurized axial-flow fan composed of static blades and moving blades. The static blades can ensure that the cooling gas enters the inside of the generator motor regularly, further reducing the ventilation loss of the cooling gas.

[0009] Preferably, a first-layer ventilation hole and a second-layer ventilation hole are newly formed in the stator inner retaining ring, increasing the contact area between the rotor inner retaining ring and the cooling gas and introducing the cooling air flow to the periphery of the rotor end winding, further reducing the maximum temperatures of the rotor inner retaining ring and the rotor end winding.

[0010] Advantages of the present invention: In the conventional large-capacity pumped-storage generator motor, the temperatures of components such as the stator and rotor end windings and the rotor retaining ring are relatively high, and the utilization rate of the cooling gas in the rotor region is also relatively low. The limited space in the rotor region cannot be effectively utilized to generate a larger fluid flow rate. In the present invention, an electric axial-flow - centrifugal fan and an inclined wind deflector are adopted on both sides of the rotor finger of the variable-speed pumped-storage generator motor. The axial-flow blades in the electric axial-flow - centrifugal fan can be electrically adjusted according to the rotation direction and speed. The outer retaining ring of the solid rotor is axially provided with a first-stage radial ventilation opening, a second-stage radial ventilation opening, and a third-stage radial ventilation opening. The outer surface of the outer retaining ring of the solid rotor is provided with wind guiding teeth. A rotor single-stage axial-flow fan is newly added on both sides of the rotating shaft. Multiple-stage segmented pressurized ventilation channel steels are newly added in the original rotor radial ventilation grooves. Centrifugal fans are added on both sides of the outer fixing plate of the rotor, thereby forming a variable-speed pumped-storage generator motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system. The variable-speed pumped-storage generator motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system improves the flow rate and pressure of the cooling gas in the radial direction through the action of the centrifugal fan component in the electric axial-flow - centrifugal fan. The cooling gas enters between the outer retaining ring and the inner retaining ring of the rotor along the inclined wind deflector under the action of the electric axial-flow fan component in the electric axial-flow - centrifugal fan, directly cooling the rotor end winding, accelerating the flow rate of the fluid around the rotor end winding, increasing the surface heat dissipation coefficient of the rotor end winding, and effectively reducing the temperature of the rotor end winding. Through the wind guiding teeth on the outer surface of the outer retaining ring of the rotor, the flow rate and pressure of the cooling gas are further increased, the flow rate of the fluid around the stator end winding is accelerated, and the temperature of the stator end winding is effectively reduced. The variable-speed pumped-storage generator motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system described in the present invention can effectively improve the cooling effect in the end region, increase the flow rate and flow velocity of the cooling gas in the end region, especially reduce the temperatures of the severely heated rotor end winding, rotor retaining ring, and stator end winding, save the manufacturing cost of the generator motor, and enhance the ability of the variable-speed pumped-storage generator motor to operate safely and stably. Description of the Drawings

[0011] For ease of explanation, the present invention will be described in detail by the following specific embodiments and accompanying drawings.

[0012] Figure 1 It is a fluid flow diagram inside a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the present invention.

[0013] Figure 2 It is a three-dimensional perspective view of the circumferential distribution of an electric axial-flow - centrifugal fan of a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the present invention under generator operating conditions.

[0014] Figure 3 It is a partial enlarged view of the electric axial-flow - centrifugal fan at position ① of a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the present invention under generator operating conditions.

[0015] Figure 4 It is a three-dimensional perspective view of the outer retaining ring area of the rotor of a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the present invention.

[0016] Figure 5 It is a partial enlarged view of the outer retaining ring at position ② of the rotor of a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the present invention.

[0017] Figure 6 It is a three-dimensional perspective view of the rotor area of a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the present invention under motor operating conditions.

[0018] Figure 7 It is a partial enlarged view of the electric axial-flow - centrifugal fan at position ③ of a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the present invention under motor operating conditions.

[0019] Figure 8 It is a radial cross-sectional view of the outer retaining ring of the rotor of a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the present invention.

[0020] Figure 9 It is a fluid flow diagram inside a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the second specific embodiment of the present invention.

[0021] Figure 10 It is a fluid flow diagram inside a variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial pressurized end ventilation system according to the third specific embodiment of the present invention.

[0022] Figure 11 Internal fluid flow diagram of a variable-speed pumped-storage power generation motor with an electric axial-centrifugal radial-axial supercharging end ventilation system described in the fourth specific embodiment of the present invention.

[0023] In the figure: 1 - cooler, 2 - stator support, 3 - stator positioning rib, 4 - stator core, 5 - radial ventilation ducts of the stator core, 6 - rotor core, 7 - radial ventilation ducts of the rotor core, 8 - electric axial-centrifugal fan, 9 - centrifugal fan, 10 - outer fixing plate of the rotor, 11 - air deflector, 12 - rotating shaft, 13 - stator retaining ring, 14 - stator pressing finger, 15 - stator end winding, 16 - outer retaining ring of the rotor, 17 - rotor end winding, 18 - inclined wind baffle, 19 - rotor pressing finger, 20 - inner retaining ring of the rotor, 21 - housing, 22 - single-stage axial-flow fan of the rotor, 23 - multi-stage segmented supercharging ventilation channel steel, 24 - air guiding teeth, 25 - radial ventilation opening of the outer retaining ring of the rotor. The arrows in the figure indicate the flow direction of the internal cooling gas of the variable-speed pumped-storage power generation motor with an electric axial-centrifugal radial-axial supercharging end ventilation system. Specific Embodiment

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0025] Specific Embodiment 1: In combination with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8Description of this embodiment, which includes a cooler 1, a stator support 2, stator positioning ribs 3, a stator core 4, radial ventilation grooves 5 in the stator core, a rotor core 6, radial ventilation grooves 7 in the rotor core, an electric axial - centrifugal fan 8, a centrifugal fan 9, a rotor outer fixing plate 10, a wind guide plate 11, a rotating shaft 12, a stator retaining ring 13, stator retaining fingers 14, stator end windings 15, a rotor outer retaining ring 16, rotor end windings 17, an inclined wind baffle 18, rotor retaining fingers 19, a rotor inner retaining ring 20, a housing 21, a rotor single - stage axial - flow fan 22, a multi - stage segmented supercharging ventilation channel steel 23, wind guide teeth 24, a radial ventilation opening 25 in the rotor outer retaining ring, a supercharging axial - flow fan 26, and a ventilation hole 27. Radial ventilation grooves 5 are provided in the stator core 4; radial ventilation grooves 7 are provided in the rotor core 6; the electric axial - centrifugal fan 8 is composed of an electric axial - flow fan 8 - 1 and a centrifugal fan 8 - 2 connected to each other; the radial ventilation opening 25 in the rotor outer retaining ring is composed of a first - stage radial ventilation opening 25 - 1, a second - stage radial ventilation opening 25 - 2, and a third - stage radial ventilation opening 25 - 3; the multi - stage segmented supercharging ventilation channel steel 23 is composed of a first - stage supercharging ventilation channel steel 23 - 1, a second - stage supercharging ventilation channel steel 23 - 2, and a third - stage supercharging ventilation channel steel 23 - 3. The wind guide plate 11 is installed on the rotating shaft 12, the centrifugal fan 9 is installed on both sides of the rotor outer fixing plate 10, the electric axial - centrifugal fan 8 is installed on both sides of the rotor retaining fingers 19, the axial flow blades in the electric axial - centrifugal fan 8 can be electrically adjusted according to the rotation direction and speed, the inclined wind baffle 18 is installed outside the electric axial - centrifugal fan 8, the rotor outer retaining ring 16 is provided with n wind guide teeth 24 along the circumferential direction, the rotor outer retaining ring 16 is provided with a first - stage radial ventilation opening 25 - 1, a second - stage radial ventilation opening 25 - 2, and a third - stage radial ventilation opening 25 - 3 along the axial direction, the rotor single - stage axial - flow fan 22 is installed on the rotating shaft 12, and the multi - stage segmented supercharging ventilation channel steel 23 is installed in the rotor radial ventilation groove 7.

[0026] The number n of the wind guide teeth 24 provided along the circumferential direction of the rotor outer retaining ring 16 is from 80 to 120, and in this embodiment, it is taken as 100; the width of the radial ventilation groove 5 in the stator core is from 3 mm to 7 mm, and in this embodiment, it is taken as 5 mm; the width of the radial ventilation groove 7 in the rotor core is from 3 mm to 7 mm, and in this embodiment, it is taken as 5 mm; the width of the first - stage radial ventilation opening 25 - 1 provided in the rotor outer retaining ring 16 is from 10 to 20 mm, and in this embodiment, it is taken as 12 mm; the width of the second - stage radial ventilation opening 25 - 2 is from 20 to 30 mm, and in this embodiment, it is taken as 22 mm; the width of the third - stage radial ventilation opening 25 - 3 is from 30 to 40 mm, and in this embodiment, it is taken as 32 mm; the included angle a between the electric axial - flow fan 8 - 1 and the centrifugal fan 8 - 2 in the electric axial - centrifugal fan 8 is from - 40° to 40°, and in this embodiment, it is taken as 30°; the radial height of the wind guide teeth 24 on the outer surface of the rotor outer retaining ring 16 is from 10 mm to 20 mm, and in this embodiment, it is taken as 10 mm.

[0027] On both sides of the original rotor finger pressure 19 of the variable-speed pumped-storage power generation motor, an electric axial-flow - centrifugal fan 8 and an inclined wind deflector 18 are newly added. The axial-flow blades in the electric axial-flow - centrifugal fan 8 can be electrically adjusted according to the rotation direction and speed. The original solid rotor outer retaining ring 16 is axially provided with a first-stage radial ventilation opening 25-1, a second-stage radial ventilation opening 25-2, and a third-stage radial ventilation opening 25-3. The outer surface of the original solid rotor outer retaining ring 16 is provided with air guiding teeth 24. On both sides of the rotating shaft 12, a rotor single-stage axial-flow fan 22 is newly added. In the original rotor radial ventilation groove 7, a multi-stage segmented pressurized ventilation channel steel 23 is newly added. On both sides of the rotor outer fixing plate 10, a centrifugal fan 9 is newly added. When the variable-speed pumped-storage power generation motor operates in the generator mode, the clockwise rotation of the rotating shaft 12 drives the rotor single-stage axial-flow fan 22 to rotate, and presses the cooling gas into its interior from both sides of the power generation motor. One path of the cooling gas enters the centrifugal fan 9 in the radial direction. Under the action of the centrifugal fan 9, the flow rate and pressure of the cooling gas increase. The cooling gas with increased flow rate and pressure enters the electric axial-flow - centrifugal fan 8. Under the action of the centrifugal fan component in the electric axial-flow - centrifugal fan 8, the flow rate and pressure of the cooling gas in the radial direction further increase. The cooling gas then enters between the rotor outer retaining ring 16 and the rotor inner retaining ring 20 along the inclined wind deflector 18 under the action of the electric axial-flow fan component in the electric axial-flow - centrifugal fan 8, directly cooling the rotor end winding 17, accelerating the flow velocity of the fluid around the rotor end winding 17, increasing the surface heat dissipation coefficient of the rotor end winding 17, and effectively reducing the temperature of the rotor end winding 17. This part of the cooling gas flows out from the first-stage radial ventilation opening 25-1, the second-stage radial ventilation opening 25-2, and the third-stage radial ventilation opening 25-3 of the rotor outer retaining ring 16 in sequence. Since the widths of the first-stage radial ventilation opening 25-1, the second-stage radial ventilation opening 25-2, and the third-stage radial ventilation opening 25-3 increase in sequence, it can ensure that the cooling gas flows uniformly along the axial direction in the rotor outer retaining ring 16. The cooling gas flowing out from the rotor outer retaining ring radial ventilation opening 25 further increases in gas pressure under the action of the air guiding teeth 24 on the outer surface of the rotor outer retaining ring 16, enabling the cooling gas with increased pressure to directly cool the stator end winding 15, accelerating the flow velocity of the fluid around the stator end winding 15, and effectively reducing the temperature of the stator end winding 15. This path of the cooling gas flows out from the machine base outlet and then enters the cooler 1.Another path of cooling gas enters axially into the interior of the air guide plate 11. Under the action of the air guide plate 11, the pressure of the cooling gas increases and then directly enters the rotor radial ventilation grooves 7. Under the action of the multi-stage segmented pressurized ventilation channel steel 23 in the rotor radial ventilation grooves 7, the pressure of the cooling gas increases successively under the action of the first-stage pressurized ventilation channel steel 23-1, the second-stage pressurized ventilation channel steel 23-2, and the third-stage pressurized ventilation channel steel 23-3, so that the fluid flow rate in the straight section area of the variable-speed pumped-storage generator motor further increases. The cooling gas with increased flow rate enters the stator radial ventilation grooves 5 through the air gap between the stator core 4 and the rotor core 6, and can effectively take away the heat of the stator end winding 15 and the stator core 4 in the straight section area of the generator motor. This path of cooling gas flows out from the frame outlet and then enters the cooler 1. The last path of cooling gas directly cools the stator end winding 15 after passing through the area between the rotor retaining ring 16 and the housing 21 and then enters the cooler 1. After passing through the cooler 1, the temperature of the three paths of cooling gas decreases, and finally, under the rotation of the rotor single-stage axial-flow fan 22, it enters the interior of the generator motor again, thus completing the cycle of the entire ventilation and cooling system. When the variable-speed pumped-storage generator motor operates in the motor mode, at this time, the rotating shaft 12 rotates counterclockwise, and the included angle a between the axial-flow fan 8-1 and the centrifugal fan 8-2 in the electro-axial-flow / centrifugal fan 8 can be rotated from 30° to -30°. Other ventilation and cooling methods are the same as those in the generator mode. The variable-speed pumped-storage generator motor with an electro-axial-flow / centrifugal radial-axial pressurized end ventilation system can effectively improve the cooling effect of the stator and rotor end regions, increase the flow rate and velocity of the cooling gas in the stator and rotor end regions, especially reduce the temperatures of the rotor retaining ring 16, the rotor end winding 17, and the stator end winding 15 with serious heating, save the manufacturing cost of the generator motor, and enhance the ability of the variable-speed pumped-storage generator motor to operate safely and stably.

[0028] Specific Embodiment 2: In combination with Figure 9 This embodiment is described. The difference between this embodiment and Embodiment 1 is that the rotor retaining ring 16 is newly provided with a fourth-stage radial ventilation port 25-4 and a fifth-stage radial ventilation port 25-5 axially, increasing the contact area between the rotor retaining ring 16 and the cooling gas, and further reducing the maximum temperature of the rotor retaining ring 16. Other compositions and connection relationships are the same as those in Embodiment 1.

[0029] Specific Embodiment 3: In combination with Figure 10Regarding this embodiment, the difference between this embodiment and the first embodiment is that the single-stage axial-flow fans 22 of the rotors on both sides of the rotating shaft 12 are adjusted to a pressurized axial-flow fan 26 composed of a static airfoil 26-1 and a dynamic airfoil 26-2. The static airfoil 26-1 can ensure that the cooling gas enters the interior of the generator motor regularly, further reducing the ventilation loss of the cooling gas. The other components and connection relationships are the same as those in the first embodiment.

[0030] Specific Embodiment 4: Combining Figure 11 Regarding this embodiment, the difference between this embodiment and the first embodiment is that a first layer of ventilation holes 27-1 and a second layer of ventilation holes 27-2 are newly formed in the stator inner retaining ring 20, increasing the contact area between the rotor inner retaining ring 20 and the cooling gas, and introducing the cooling air flow around the rotor end winding 17, further reducing the maximum temperatures of the rotor inner retaining ring 20 and the rotor end winding 17. The other components and connection relationships are the same as those in the first embodiment.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial supercharging end ventilation system, characterized in that: It includes a cooler (1), a stator support (2), stator positioning ribs (3), a stator core (4), radial ventilation grooves in the stator core (5), a rotor core (6), radial ventilation grooves in the rotor core (7), an electric axial - centrifugal fan (8), a centrifugal fan (9), a rotor outer fixing plate (10), a wind guide plate (11), a rotating shaft (12), a stator retaining ring (13), stator pressing fingers (14), stator end windings (15), a rotor outer retaining ring (16), rotor end windings (17), an inclined wind deflector (18), rotor pressing fingers (19), a rotor inner retaining ring (20), a housing (21), a rotor single - stage axial - flow fan (22), a multi - stage segmented pressurized ventilation channel steel (23), wind guide teeth (24), radial ventilation openings in the rotor outer retaining ring (25), a pressurized axial - flow fan (26), and ventilation holes (27). Radial ventilation grooves in the stator core (5) are provided in the stator core (4); radial ventilation grooves in the rotor core (7) are provided in the rotor core (6); the electric axial - centrifugal fan (8) is composed of an electric axial - flow fan (8 - 1) and a centrifugal fan (8 - 2) connected to each other; the radial ventilation openings in the rotor outer retaining ring (25) are composed of a first - stage radial ventilation opening (25 - 1), a second - stage radial ventilation opening (25 - 2), and a third - stage radial ventilation opening (25 - 3); the multi - stage segmented pressurized ventilation channel steel (23) is composed of a first - stage pressurized ventilation channel steel (23 - 1), a second - stage pressurized ventilation channel steel (23 - 2), and a third - stage pressurized ventilation channel steel (23 - 3); the wind guide plate (11) is installed on the rotating shaft (12), the centrifugal fan (9) is installed on both sides of the rotor outer fixing plate (10), the electric axial - centrifugal fan (8) is installed on both sides of the rotor pressing fingers (19), the axial - flow blades in the electric axial - centrifugal fan (8) can be electrically adjusted according to the rotation direction and speed, the inclined wind deflector (18) is installed outside the electric axial - centrifugal fan (8), the rotor outer retaining ring (16) is provided with n wind guide teeth (24) along the circumferential direction, the rotor outer retaining ring (16) is provided with a first - stage radial ventilation opening (25 - 1), a second - stage radial ventilation opening (25 - 2), and a third - stage radial ventilation opening (25 - 3) along the axial direction, the rotor single - stage axial - flow fan (22) is installed on the rotating shaft (12), and the multi - stage segmented pressurized ventilation channel steel (23) is installed in the rotor radial ventilation grooves (7).

2. The variable-speed pumped-storage power generation motor with an electric axial-centrifugal radial-axial supercharging end ventilation system according to claim 1, characterized in that: The number n of the air guiding teeth (24) circumferentially arranged on the rotor outer retaining ring (16) is 80 to 120; the width of the radial ventilation grooves (5) of the stator core is 3 mm to 7 mm; the width of the radial ventilation grooves (7) of the rotor core is 3 mm to 7 mm; the width of the first-stage radial ventilation openings (25-1) formed in the rotor outer retaining ring (16) is 10 to 20 mm; the width of the second-stage radial ventilation openings (25-2) is 20 to 30 mm; the width of the third-stage radial ventilation openings (25-3) is 30 to 40 mm; the included angle a between the axial-flow fan (8-1) and the centrifugal fan (8-2) in the electric axial-flow - centrifugal fan (8) is -40° to 40°; the radial height of the air guiding teeth (24) on the outer surface of the rotor outer retaining ring (16) is 10 mm to 20 mm.

3. The variable-speed pumped storage power generation motor with an electric axial-flow - centrifugal radial-axial supercharging end ventilation system according to claim 1, wherein: A fourth-stage radial ventilation opening (25-4) and a fifth-stage radial ventilation opening (25-5) are newly added axially to the rotor outer retaining ring (16).

4. The variable-speed pumped-storage power generation motor with an electric axial-centrifugal radial-axial supercharging end ventilation system according to claim 1, wherein: The rotor single-stage axial-flow fans (22) on both sides of the rotating shaft (12) are adjusted to a pressurized axial-flow fan (26) composed of a stationary airfoil (26-1) and a moving airfoil (26-2).

5. The variable-speed pumped-storage power generation motor with an electric axial-flow - centrifugal radial-axial supercharging end ventilation system according to claim 1, characterized in that: A first-layer ventilation hole (27-1) and a second-layer ventilation hole (27-2) are newly formed inside the stator inner retaining ring (20).

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