A pumped storage generator motor rotor with a permanent magnet magnetic focusing radial boost rotor

Abstract

The present invention discloses a pumped-storage generator motor rotor with a permanent magnet magnetic concentrating radial boost rotor, belonging to the field of electric motors. To address the problems of low power density and heating in the rotor region of existing large-capacity pumped-storage generator motors, the present invention comprises high-coercivity permanent magnets and low-coercivity permanent magnets installed in an arc shape inside the rotor pole body, with low-coercivity permanent magnets located on both sides of the high-coercivity permanent magnets. Rotor yoke ventilation ducts are provided inside the rotor yoke in both the circumferential and axial directions. A rotor interpole fan is installed between adjacent rotor excitation windings and at the air outlet of the rotor yoke ventilation duct. The axial length of the rotor interpole fan is equal to that of the rotor yoke. Heat dissipation fins are provided on the rotor excitation windings, and self-cooling fans are installed on both sides of all rotor end damping connecting rings. The present invention enhances the cooling effect of the generator motor rotor region, improves the power density of the generator motor, and has a simple structure and is easy to implement.

Description

Technical Field

[0001] The invention relates to a pumped storage power generation motor rotor with a permanent magnet magnetic concentration type radial boosting rotor, belonging to the field of motors. Background Art

[0002] Hydropower is one of the cleanest ways of generating electricity. Pumped-storage generator motors, as the core equipment in the entire hydropower system, play a vital role. With the rapid development of hydropower technology, the single-unit capacity of large-scale pumped-storage generator motors continues to increase, and motor efficiency and material utilization continue to improve. However, as the single-unit capacity of pumped-storage generator motors increases, the electromagnetic load and temperature rise problems of the generator motors are also becoming increasingly severe, resulting in a significant increase in the electromagnetic loss of the generator motors and a significant increase in temperature, which seriously affects the safe operation and service life of the generator motors, and poses a hidden danger to the reliable power supply for people's living needs.

[0003] In order to effectively reduce the temperature of the rotor excitation winding and the rotor end damping connecting ring which generate serious heat in the pumped storage generator motor and to improve the power density of the generator motor and reduce the electrical load of the rotor excitation winding, a pumped storage generator motor rotor with a permanent magnet magnetic focusing radial booster rotor can be used. This can significantly enhance the magnetic field strength in the generator motor, improve the sinusoidality of the magnetic field in the air gap, increase the flow rate of the cooling gas in the pumped storage generator motor, improve the utilization rate of the cooling gas, increase the surface heat dissipation coefficient of each component in the rotor area, significantly reduce the maximum temperature of each component in the rotor area, and enhance the ability of the pumped storage generator motor to operate safely and reliably for a long time. Summary of the Invention

[0004] The purpose of the present invention is to provide a pumped-storage generator motor rotor with a permanent magnet magnetic focusing radial boost rotor, so as to solve the problem of excessive temperature of the rotor excitation winding and the rotor end damping connecting ring of the traditional pumped-storage generator motor, effectively reduce the current of the rotor excitation winding of the pumped-storage generator motor, reduce the maximum temperature of the rotor excitation winding and the rotor end damping connecting ring, improve the utilization rate of the cooling gas in the pumped-storage generator motor and the power density of the generator motor, reduce the temperature difference and thermal stress in the axial direction of the generator motor rotor area, and ensure that the pumped-storage generator motor can operate stably for a long time.

[0005] The present invention provides a pumped storage power generation motor rotor with a permanent magnet magnetic concentration type radial boost rotor, which includes a rotor pole shoe, a support plate, a rotor excitation winding, a rotor pole body, a damping strip, a self-cooling fan, a rotor interpole fan, a high coercive force permanent magnet, a low coercive force permanent magnet, a rotor end damping connecting ring, an insulating plate, a rotor pressure plate, a rotor yoke, a rotor yoke ventilation duct and a heat dissipation fin. The high coercive force permanent magnet and the low coercive force permanent magnet are installed in an arc shape inside the rotor pole body, the low coercive force permanent magnet is located on both sides of the high coercive force permanent magnet, and a rotor yoke ventilation duct is opened inside the rotor yoke in both the circumferential direction and the axial direction. The rotor interpole fan is installed in the middle position of adjacent rotor excitation windings and at the air outlet of the rotor yoke ventilation duct. The axial length of the rotor interpole fan is equal to the axial length of the rotor yoke. The rotor excitation winding is provided with a heat dissipation fin, and self-cooling fans are installed on both sides of all rotor end damping connecting rings.

[0006] The thickness of the high coercive force permanent magnet and the low coercive force permanent magnet is 20mm to 30mm; the width of the rotor yoke ventilation duct is 5mm to 10mm; the length of the rotor yoke ventilation duct is 10mm to 60mm; the radial height of the rotor interpole fan is 40mm to 150mm; the thickness of the rotor interpole fan is 10mm to 20mm; the axial height of the self-cooling fan is 17mm to 37mm; the circumferential height of the heat dissipation fin is 5mm to 10mm.

[0007] Preferably, the combination of the high-coercive force permanent magnet and the low-coercive force permanent magnet is changed into a "W" shape, which can further improve the power density of the generator motor.

[0008] Preferably, the width of the rotor interpole fan becomes narrower near the rotor yoke side, which reduces the eddy current loss of the fluid between the rotor excitation windings and further reduces the temperature of the rotor excitation windings.

[0009] Preferably, the inner fans of the self-cooling fans are connected together, thereby increasing the flow rate of the cooling fluid and further reducing the temperature of the damping connecting ring at the end of the rotor.

[0010] The advantages of the present invention are that the rotor core and rotor excitation winding temperatures of large-capacity pumped-storage generator motors are high, resulting in low cooling gas utilization. The present invention incorporates arc-shaped high-coercivity permanent magnets and low-coercivity permanent magnets within the rotor pole body, defines rotor yoke ventilation ducts in both the circumferential and axial directions within the rotor yoke, incorporates a rotor interpole fan on the outer surface of the rotor yoke, incorporates self-cooling fans on both sides of the damping connecting ring, and incorporates heat dissipation fins into the rotor excitation winding, thereby forming a pumped-storage generator motor rotor with a permanent magnet magnetic concentrating radial booster rotor. The rotor of the pumped-storage generator motor with a permanent magnet concentrated radial boost rotor uses the magnetic flux generated by the arc-shaped high-coercivity permanent magnet and the low-coercivity permanent magnet to jointly enhance the magnetic field strength inside the pumped-storage generator motor, thereby effectively improving the sinusoidality of the magnetic field in the air gap, effectively improving the power density of the pumped-storage generator motor, and reducing the current in the rotor excitation winding, effectively reducing the temperature of the rotor excitation winding; in terms of ventilation and cooling, it ensures that the air volume inside the rotor yoke is evenly distributed in the axial and circumferential directions, effectively reducing the temperature of the rotor yoke, and the rotor interpole fan can not only ensure that the flow rate of the cooling gas in the generator motor is further increased, but also disrupt the eddy flow of the fluid between the rotor excitation windings, so that the cooling fluid flows out more regularly from between adjacent rotor excitation windings, effectively reducing the eddy current loss of the fluid and improving the utilization rate of the cooling gas. The cooling fluid between the rotor excitation windings can effectively reduce the temperature of the rotor excitation winding that is seriously heated. The cooling fluid accelerates the fluid velocity around the rotor excitation winding end under the action of the self-cooling fan on the outer surface of the rotor end damping connecting ring, effectively reducing the temperature of the rotor excitation winding end, accelerating the fluid velocity around the rotor end damping connecting ring, and further reducing the temperature of the rotor end damping connecting ring, which is seriously heated. The pumped storage generator motor rotor with a permanent magnet magnetic concentrating radial boost rotor described in the present invention can effectively enhance the cooling effect of the rotor area and improve the power density of the generator motor, increase the fluid flow rate and cooling gas utilization rate within the pumped storage generator motor, significantly reduce the maximum temperature of each component in the rotor area, and enhance the pumped storage generator motor's ability to operate safely and reliably over the long term. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and accompanying drawings.

[0012] Figure 1 This is a three-dimensional partial enlarged view of the rotor of a pumped storage generator motor with a permanent magnet magnetic focusing radial boost rotor as described in the present invention.

[0013] Figure 2This is a partially enlarged view of the radial cross-section of the rotor of the pumped storage generator motor with a permanent magnet magnetic focusing radial boost rotor as described in the present invention.

[0014] Figure 3 This is a cross-sectional view of the rotor of a pumped storage generator motor with a permanent magnet magnetic focusing radial boost rotor at MM according to the present invention.

[0015] Figure 4 This is a cross-sectional view of the magnetic poles of a pumped storage generator motor rotor having a permanent magnet magnetic focusing radial boost rotor according to a second specific embodiment of the present invention.

[0016] Figure 5 This is a partially enlarged view of the radial cross-section of a pumped-storage generator motor rotor having a permanent magnet magnetic focusing radial booster rotor as described in the third specific embodiment of the present invention.

[0017] Figure 6 This is a three-dimensional partial enlarged view of a pumped storage generator motor rotor with a permanent magnet magnetic focusing radial boost rotor as described in the fourth specific embodiment of the present invention.

[0018] In the figure: 1-rotor pole shoes, 2-support plate, 3-rotor excitation winding, 4-rotor pole body, 5-damping strip, 6-self-cooling fan, 7-rotor interpole fan, 8-high coercive force permanent magnet, 9-low coercive force permanent magnet, 10-rotor end damping connecting ring, 11-insulating plate, 12-rotor pressure plate, 13-rotor yoke, 14-rotor yoke ventilation duct and 15-heat dissipation fin. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative 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 unnecessary confusion of the concepts of the present invention.

[0020] Specific implementation method one: Figure 1 、 Figure 2 and Figure 3This embodiment describes the present invention, which includes a rotor pole shoe 1, a support plate 2, a rotor excitation winding 3, a rotor pole body 4, a damping strip 5, a self-cooling fan 6, a rotor interpole fan 7, a high coercive force permanent magnet 8, a low coercive force permanent magnet 9, a rotor end damping connecting ring 10, an insulating plate 11, a rotor pressure plate 12, a rotor yoke 13, a rotor yoke ventilation duct 14 and a heat dissipation fin 15. The high coercive force permanent magnet 8 and the low coercive force permanent magnet 9 are installed in the shape of an arc inside the rotor pole body 4, and the low coercive force permanent magnet 9 is located on both sides of the high coercive force permanent magnet 8. The rotor yoke 13 is provided with a rotor yoke ventilation duct 14 in the circumferential direction and the axial direction. The rotor interpole fan 7 is installed in the middle position of the adjacent rotor excitation winding 3 and is located at the air outlet of the rotor yoke ventilation duct 14. The axial length of the rotor interpole fan 7 is equal to the axial length of the rotor yoke 13. The rotor excitation winding 3 is provided with a heat dissipation fin 15, and all rotor end damping connecting rings 10 are installed with self-cooling fans 6 on both sides.

[0021] The thickness of the high coercive force permanent magnet 8 and the low coercive force permanent magnet 9 is 20mm to 30mm, and is 25mm in this embodiment; the width of the rotor yoke ventilation duct 14 is 5mm to 10mm, and is 6mm in this embodiment; the length of the rotor yoke ventilation duct 14 is 10mm to 60mm, and is 40mm in this embodiment; the radial height of the rotor interpole fan 7 is 40mm to 150mm, and is 70mm in this embodiment; the thickness of the rotor interpole fan 7 is 10mm to 20mm, and is 12mm in this embodiment; the axial height of the self-cooling fan 6 is 17mm to 37mm, and is 25mm in this embodiment; the circumferential height of the heat dissipation fin 15 is 5mm to 10mm, and is 7mm in this embodiment.

[0022] A pumped storage power generation motor rotor with a permanent magnet magnetic concentration type radial boost rotor has arc-shaped high-coercivity permanent magnets 8 and low-coercivity permanent magnets 9 added inside the original solid rotor pole body. The low-coercivity permanent magnets 9 are located on both sides of the high-coercivity permanent magnets 8. Rotor yoke ventilation ducts 14 are opened in the solid rotor yoke in both circumferential and axial directions. A rotor interpole fan 7 is newly provided on the outer surface of the rotor yoke 13. Self-cooling fans 6 are newly provided on both sides of the rotor end damping connecting ring 10. Heat dissipation fins 15 are newly provided to the rotor excitation winding 3. The magnetic flux generated by the high coercive force permanent magnet 8 and the magnetic flux generated by the low coercive force permanent magnet 9 jointly enhance the magnetic field strength in the pumped storage generator motor. The high coercive force permanent magnet 8 can generate a stronger magnetic field strength than the low coercive force permanent magnet 9. Moreover, the high coercive force permanent magnet 8 and the low coercive force permanent magnet 9 are arc-shaped, thereby effectively improving the sinusoidality of the magnetic field in the air gap. In addition, the magnetic field generated by the excitation current in the rotor excitation winding 3 can effectively improve the power density of the pumped storage generator motor, and can also reduce the current in the rotor excitation winding 3, thereby effectively reducing the temperature of the rotor excitation winding 3. When the rotor of the pumped storage generator motor rotates, the cooling fluid flows into the rotor yoke ventilation duct 14 from the inlet, which can ensure that the air volume inside the rotor yoke 13 is evenly distributed in the axial direction and the circumferential direction, thereby effectively reducing the temperature of the rotor yoke 13. The cooling gas from the outlet of the rotor yoke ventilation duct 14 is fanned out of the rotor poles. Under the action of 7, the pressure and flow are further increased. The rotor interpole fan 7 can not only ensure that the flow of cooling gas in the pumped storage generator motor can be further increased regardless of whether it is in forward rotation (generator operating condition) or reverse rotation (motor operating condition), but also can disrupt the eddy flow of the fluid between the rotor excitation windings 3, so that the cooling fluid flows out from between adjacent rotor excitation windings 3 more regularly, effectively reducing the eddy current loss of the fluid and improving the utilization rate of the cooling gas. The cooling fluid between the rotor excitation windings 3 can effectively reduce the temperature of the rotor excitation winding with severe heat generation. The heat dissipation fins 15 on the surface of the rotor excitation winding 3 can, on the one hand, increase the contact area between the cooling gas and the rotor excitation winding 3, effectively taking away the heat of the rotor excitation winding 3, and on the other hand, can further accelerate the flow speed of the fluid between adjacent rotor excitation windings 3, thereby improving the surface heat dissipation coefficient of the rotor excitation winding 3.A portion of the cooling gas flowing out from between the rotor excitation windings 3 can effectively remove heat from the rotor pressure plate 12, the damping strips 5, and the rotor pole shoes 1, thereby reducing the temperature of the rotor pressure plate 12, the damping strips 5, and the rotor pole shoes 1. The other portion of the cooling fluid, under the action of the self-cooling fan 6 on the outer surface of the rotor end damping connecting ring 10, can further accelerate the fluid velocity around the end of the rotor excitation winding 3, effectively reducing the temperature of the end of the rotor excitation winding 3. At the same time, it can also accelerate the fluid velocity around the rotor end damping connecting ring 10, increase the contact area between the cooling fluid and the rotor end damping connecting ring 10, and further reduce the temperature of the rotor end damping connecting ring 10 where heat is most severe. The pumped-storage generator motor rotor with a permanent magnet magnetic concentrating radial boost rotor can significantly enhance the magnetic field strength within the generator motor, improve the sinusoidality of the magnetic field within the air gap, ensure that the air volume within the rotor area is evenly distributed in the axial and circumferential directions, effectively reduce the temperature of the rotor excitation winding 3 and the rotor end damping connecting ring 10 where heat is most severe, and enhance the safe and reliable operation capability of the pumped-storage generator motor.

[0023] Specific implementation method 2: Combination Figure 4 This embodiment differs from the first embodiment in that the high-coercivity permanent magnets 8 and low-coercivity permanent magnets 9 are combined into a "W" shape, further increasing the power density of the generator motor. The remaining components and connections are the same as those in the first embodiment.

[0024] Specific implementation method three: Combination Figure 5 This embodiment differs from the first embodiment in that the width of the rotor interpole fan 7 is narrowed near the rotor yoke 13, reducing eddy current losses in the fluid between the rotor field windings 3 and further lowering the temperature of the rotor field windings 3. The remaining components and connections are the same as those in the first embodiment.

[0025] Specific implementation method four: Combination Figure 6 This embodiment differs from the first embodiment in that the inner fans of the self-cooling fan 6 are connected together, increasing the flow rate of the cooling fluid and further reducing the temperature of the rotor end damping connecting ring 10. The other components and connection relationships are the same as those of the first embodiment.

[0026] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A pumped storage generator motor rotor with a permanent magnet magnetic concentrating radial boost rotor, characterized by: The invention comprises a rotor pole shoe (1), a support plate (2), a rotor excitation winding (3), a rotor pole body (4), a damping strip (5), a self-cooling fan (6), a rotor interpolar fan (7), a high coercive force permanent magnet (8), a low coercive force permanent magnet (9), a rotor end damping connecting ring (10), an insulating plate (11), a rotor pressure plate (12), a rotor yoke (13), a rotor yoke ventilation duct (14) and a heat dissipation fin (15); the high coercive force permanent magnet (8) and the low coercive force permanent magnet (9) are arranged in an arc shape inside the rotor pole body (4), and the low coercive force permanent magnet (9) is arranged in an arc shape inside the rotor pole body (4). The permanent magnets (9) are located on both sides of the high coercive force permanent magnets (8); a rotor yoke ventilation duct (14) is provided inside the rotor yoke (13) along the circumferential direction and the axial direction; a rotor interpole fan (7) is installed in the middle of adjacent rotor excitation windings (3) and is located at the air outlet of the rotor yoke ventilation duct (14); the axial length of the rotor interpole fan (7) is equal to the axial length of the rotor yoke (13); a heat dissipation fin (15) is provided on the rotor excitation winding (3); and self-cooling fans (6) are installed on both sides of all rotor end damping connecting rings (10).

2. The pumped storage generator motor rotor with a permanent magnet magnetic focusing radial boost rotor according to claim 1, characterized in that: The thickness of the high coercive force permanent magnet (8) and the low coercive force permanent magnet (9) is 20 mm to 30 mm; the width of the rotor yoke ventilation duct (14) is 5 mm to 10 mm; the length of the rotor yoke ventilation duct (14) is 10 mm to 60 mm; the radial height of the rotor interpole fan (7) is 40 mm to 150 mm; the thickness of the rotor interpole fan (7) is 10 mm to 20 mm; the axial height of the self-cooling fan (6) is 17 mm to 37 mm; and the circumferential height of the heat dissipation fin (15) is 5 mm to 10 mm.

3. The pumped storage generator motor rotor with a permanent magnet magnetic focusing radial boost rotor according to claim 1, characterized in that: The combined shape of the high coercive force permanent magnet (8) and the low coercive force permanent magnet (9) is a "W" shape.

4. The pumped storage generator motor rotor with a permanent magnet magnetic focusing radial boost rotor according to claim 1, characterized in that: The width of the rotor interpole fan (7) becomes narrower on the side close to the rotor yoke (13).

5. The pumped storage generator motor rotor with a permanent magnet magnetic focusing radial boost rotor according to claim 1, characterized in that: The inner fans of the self-cooling fan (6) are connected together.

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