Rotor structure of high-impedance generator

Abstract

The utility model discloses a rotor structure of a high-impedance generator. The rotor structure comprises a shaftless rotor, a rotating shaft and a rotor winding, the shaftless rotor comprises a rotor core and a rotor damping structure. The rotor iron core comprises a head section iron core, a middle section iron core and a tail section iron core; iron core cushion blocks are arranged among the sections of iron cores; the rotor damping structure comprises four groups of damping rod through holes formed in pole shoes of four magnetic poles; the four groups of damping rods are arranged in the four groups of damping rod through holes; the two damping plates are arranged at the two ends of the rotor iron core; the two ends of each pair of damping rods penetrate through the damping rod through holes of the two damping plates and then are welded with the two damping plates; the rotating shaft is pressed in a shaft hole of the shaftless rotor; the rotor winding comprises four rotor coils wound on the pole bodies of the four magnetic poles, eight pairs of coil supporting blocks arranged between the inner surfaces of the two ends of the four rotor coils and the outer surfaces of the two damping plates, and four sets of coil pressing blocks arranged in the four inter-pole spaces. According to the utility model, higher stability and optimized output power are shown in a high-load environment.

Description

Technical Field

[0001] The utility model relates to a rotor structure of a high-impedance generator. Background Art

[0002] Traditional synchronous generators usually face problems such as efficiency decline and output fluctuation under the working conditions of high load and sudden addition or removal of large current. These problems not only affect the performance of the generator, but also limit its application in the power system. There are still certain limitations in the existing technologies for improving the performance and stability of generators.

[0003] When designing conventional generators, adjustments are usually made in aspects such as electromagnetic design, material selection and structural optimization. However, due to the large current fluctuations under high load and sudden load conditions, it is difficult for the impedance change of the generator to meet the requirements of efficient and stable operation. Therefore, there are still deficiencies in the existing technologies for dealing with these problems. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects of the existing technology and provide a rotor structure of a high-impedance generator, which improves the internal impedance of the generator and shows higher stability and optimized output power in a high-load environment.

[0005] The purpose of the utility model is realized by the following technical solution: a rotor structure of a high-impedance generator, including a shaftless rotor, a rotating shaft and a rotor winding; the shaftless rotor includes a rotor core and a rotor damping structure, wherein,

[0006] The rotor core includes a first-section core, a middle-section core and a tail-section core; the length L1 of the first-section core is the same as the length L1 of the tail-section core; the length L2 of the middle-section core is 1.732 times the length L1 of the first-section core and the length L1 of the tail-section core, that is, L2 = 1.732×L1; there are core pads between the first-section core and the middle-section core and between the middle-section core and the tail-section core; the rotor core is a salient-pole structure with a yoke and four magnetic poles; a shaft hole is opened at the center of the yoke; an inter-pole space with a cross-section approximately in an isosceles triangle shape is formed between adjacent magnetic poles;

[0007] The rotor damping structure includes four groups of damping bar through-holes, four groups of damping bars and two damping plates; the four groups of damping bar through-holes are axially arranged on the pole shoes of the four magnetic poles of the rotor core one by one; the four groups of damping bars are installed in the four groups of damping bar through-holes one by one; each group of damping bars is composed of several pairs of damping bars, and each pair of damping bars is installed in a damping bar through-hole; the shape of the damping plate is the same as the shape of the cross-section of the rotor core, and the two damping plates are arranged at both ends of the rotor core one by one, and damping bar perforations are axially arranged on the two damping plates corresponding to the damping bar through-holes on the rotor core, so that both ends of each pair of damping bars pass through the damping bar perforations of the two damping plates one by one and are welded to the two damping plates;

[0008] The rotating shaft is press-fitted into the shaft hole of the shaftless rotor;

[0009] The rotor winding includes four rotor coils, eight pairs of coil supports and four groups of coil pressing blocks; the four rotor coils are wound around the pole bodies of the four magnetic poles of the rotor core one by one, insulating glue is applied on the contact surfaces of the four rotor coils and the rotor core, and insulating glue is also coated between the layers of each rotor coil; the eight pairs of coil supports are arranged between the inner surfaces of both ends of the four rotor coils and the outer surfaces of the two damping plates one by one; the four groups of coil pressing blocks are arranged in the four inter-pole spaces along the length direction of the rotor core one by one, and both side surfaces of each group of coil pressing blocks radially press two adjacent rotor coils tightly.

[0010] For the rotor structure of the above high-impedance generator, the rotor core is laminated by high-permeability silicon steel sheets.

[0011] For the rotor structure of the above high-impedance generator, the damping bars, coil supports and coil pressing blocks are all made of aluminum.

[0012] The rotor structure of the high-impedance generator of the present invention has the following characteristics:

[0013] 1. By changing the rotor core material and selecting a core material with higher permeability, the saturation permeability of the generator can be increased, and combined with electromagnetic design, the magnetic circuit design of the generator can be changed to reduce magnetic flux leakage and magnetic resistance loss. By using appropriate soft magnetic materials and improving the manufacturing process of the core, the hysteresis phenomenon in the core can be reduced, the saturation permeability can be improved, and thus its impedance can be increased.

[0014] 2. Use thinner wires and select wire materials with higher resistivity to wind the rotor coils. By increasing the number of turns of the rotor coils or adjusting the layout of the wires, the resistance of the rotor can be increased, thereby effectively improving the impedance of the generator.

[0015] 3. Without affecting the rated output, adjust the design parameters of the generator. Increase the cross-sectional area of the rotor core, increase the thickness of the rotor core, and use a multi-segment core design to achieve this. Increasing the cross-sectional area of the rotor core can reduce the magnetic flux density and increase the impedance of the generator.

[0016] 4. Add a damping winding at the end of the pole shoe of the rotor, and replace the material of the generator rotor damping winding with a material with a lower conductivity. This can increase the reactance of the winding, thereby reducing the conductivity of the generator, decreasing the current conduction efficiency, and ultimately increasing the impedance of the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of the rotor structure of the high-impedance generator of the present utility model;

[0018] Figure 2 is the side view of the rotor structure of the high-impedance generator of the present utility model;

[0019] Figure 3 is the side view of the rotor core in the rotor structure of the high-impedance generator of the present utility model;

[0020] Figure 4a is the front view of the shaftless rotor in the rotor structure of the high-impedance generator of the present utility model;

[0021] Figure 4b is the side view of the shaftless rotor in the rotor structure of the high-impedance generator of the present utility model;

[0022] Figure 5a is the front view of the shaftless rotor in the rotor structure of the high-impedance generator of the present utility model after a rotating shaft is pressed into the shaft hole;

[0023] Figure 5b is the side view of the shaftless rotor in the rotor structure of the high-impedance generator of the present utility model after a rotating shaft is pressed into the shaft hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present utility model will be further described below with reference to the accompanying drawings.

[0025] Please refer to Figures 1 to 5b , the rotor structure of the high-impedance generator of the present utility model includes a shaftless rotor 2, a rotating shaft 20, and a rotor winding; the shaftless rotor 2 is composed of a rotor core 1 and a rotor damping structure.

[0026] The rotor core 1 is laminated with high-permeability silicon steel sheets with a thickness of 0.5 mm. The rotor core 1 includes a first-section core 11, a middle-section core 12, and a last-section core 13. Among them, the length L1 of the first-section core 11 is the same as the length L1 of the last-section core 13. The length L2 of the middle-section core 12 is 1.732 times the length L1 of the first-section core 11 and the length L1 of the last-section core 13, that is, L2 = 1.732 × L1. Core pads 14 are provided between the first-section core 11 and the middle-section core 12 and between the middle-section core 12 and the last-section core 13. The rotor core 1 is a salient-pole structure with a yoke 1A and four magnetic poles 1B. A shaft hole 10 is opened at the center of the yoke 1A. An inter-pole space 1C with a cross-section approximately in the shape of an isosceles triangle is formed between adjacent magnetic poles 1B.

[0027] The rotor core 1 designed in this way can not only improve the magnetic performance, but also effectively evenly distribute the magnetic flux density, reduce the hysteresis loss and eddy current loss, thereby improving the overall performance of the rotor core 1. Before laminating the multi-section core, the core pads 14 are placed to ensure uniform gaps between the cores of each section and provide necessary structural support and stability. The multi-section core is welded into an integral rotor core by argon arc welding. Argon arc welding not only provides a high-strength connection to ensure close contact between all parts of the core, but also effectively avoids oxidation during the welding process, ensuring the electrical and magnetic performance stability of the welded parts.

[0028] The rotor damping structure includes four groups of damping rod through-holes 30, four groups of damping rods 31, and two damping plates 32. Among them, the four groups of damping rod through-holes 30 are axially opened on the pole shoes of the four magnetic poles 1B of the rotor core 1 one by one, and the inner diameter of each damping rod through-hole 30 is Ф9. The four groups of damping rods are installed in the four groups of damping rod through-holes 30 one by one. Each group of damping rods 31 is composed of several pairs of damping rods 31, and each pair of damping rods 31 is installed in a damping rod through-hole 30 respectively to ensure that each pair of damping rods 31 is arranged neatly in a damping rod through-hole 30. The shape of the damping plate 32 is the same as the shape of the cross-section of the rotor core 1. The two damping plates 32 are provided at both ends of the rotor core 1 one by one, and damping rod through-holes corresponding to the damping rod through-holes 30 on the rotor core 1 are opened on the two damping plates 32, so that both ends of each pair of damping rods 31 pass through the damping rod through-holes of the two damping plates 32 one by one and are welded to the two damping plates 32 to improve the structural strength and stability of the entire rotor. Cylindrical damping rods 31 are made of aluminum with a diameter of Ф8 or materials with lower conductivity. These materials have good electrical performance and mechanical strength, and can reduce the power loss while increasing the impedance of the generator.

[0029] The rotating shaft 20 is press-fitted into the shaft hole 10 of the shaftless rotor 2. To ensure a tight fit between the rotating shaft 20 and the shaftless rotor 2, during the press-fitting process of the rotating shaft 20, precise centering equipment and measuring tools are used to ensure that the concentricity and center runout between the shaftless rotor 2 and the rotating shaft 20 are within the allowable range. This step is crucial for ensuring the running balance and stability of the generator.

[0030] The rotor winding includes four rotor coils 40, eight pairs of coil support blocks 41, and four groups of coil pressing blocks 42. Among them, the four rotor coils 40 are wound around the pole bodies of the four magnetic poles 1B of the rotor core 1 one by one. Each rotor coil 40 is wound with a thin wire with a wire gauge of Ф5.19. Insulating glue is applied to the contact surfaces between the four rotor coils 40 and the rotor core 1 to ensure the insulation performance of the rotor winding. Also, insulating glue is coated between layers of each rotor coil 40 to ensure that each layer of the coil is fully filled with insulating glue, so as to improve the mechanical strength and electrical performance of the rotor winding. The eight pairs of coil support blocks 41 are arranged between the inner surfaces at both ends of the four rotor coils 40 and the outer surfaces of the two damping plates 32 one by one. The coil support blocks 41 are made of aluminum or materials with lower conductivity. Each coil support block 41 is fixed to the outer surface of the damping plate 32 by bolts, providing stable support for the subsequent winding process. The four groups of coil pressing blocks 42 are each installed in the four inter-pole spaces 1C along the length direction of the rotor core 1 one by one through bolts. The two side surfaces of each group of coil pressing blocks 42 radially press two adjacent rotor coils 40, firmly pressing the rotor coils 40 onto the shaftless rotor to ensure that the rotor coils 40 do not move during rotation. The coil pressing blocks 42 are also made of aluminum or materials with lower conductivity.

[0031] The rotor structure of the high-impedance generator of the present utility model improves the impedance of the generator through the following technical means:

[0032] 1. By changing the rotor core material and selecting a core material with higher magnetic permeability, the saturation magnetic permeability of the generator can be increased. Combining with electromagnetic design, the magnetic circuit design of the generator is changed to reduce magnetic flux leakage and magnetic resistance loss, including optimizing aspects such as the shape, size, and structure of the core. By using appropriate soft magnetic materials and improving the manufacturing process of the core, the hysteresis phenomenon in the core can be reduced, the saturation magnetic permeability can be increased, and thus its impedance can be increased.

[0033] 2. Use thinner wires and select wire materials with higher resistivity to wind the rotor coils. By increasing the number of turns of the rotor coils or adjusting the layout of the wires, the resistance of the rotor can be increased, thereby effectively improving the impedance of the generator.

[0034] 3. Without affecting the rated output, adjust the design parameters of the generator, increase the cross-sectional area of the rotor core, increase the thickness of the rotor core, and use a multi-segment core design to achieve this. Increasing the cross-sectional area of the rotor core can reduce the magnetic flux density and increase the impedance of the generator.

[0035] 4. Add a damping winding at the end of the pole shoe of the rotor and replace the material of the damping winding of the generator rotor with a material having a lower conductivity. This can increase the reactance of the winding, thereby reducing the conductivity of the generator, decreasing the current conduction efficiency, and ultimately increasing the impedance of the generator.

[0036] The above embodiments are only for illustrating the present utility model and not for limiting the present utility model. Those skilled in the relevant technical fields can also make various transformations or modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions should also fall within the scope of the present utility model and should be defined by each claim.

Claims

1. A rotor structure of a high impedance generator, comprising a shaftless rotor, a rotating shaft and a rotor winding; the shaftless rotor comprises a rotor core and a rotor damping structure, characterized in that: The rotor core comprises a first core section, a middle core section and a tail core section; the length L1 of the first core section is the same as the length L1 of the tail core section; the length L2 of the middle core section is 1.732 times the length L1 of the first core section and the length L1 of the tail core section, that is, L2=1.732×L1; core pads are provided between the first core section and the middle core section, and between the middle core section and the tail core section; the rotor core is a salient pole structure with a yoke and four magnetic poles; an axial hole is provided at the center of the yoke; an inter-pole space having a cross section roughly in the shape of an isosceles triangle is formed between adjacent magnetic poles; The rotor damping structure comprises four groups of damping rod through holes, four groups of damping rods and two damping plates; the four groups of damping rod through holes are axially opened one by one on the pole shoes of the four magnetic poles of the rotor core; the four groups of damping rods are installed one by one in the four groups of damping rod through holes; each group of damping rods is composed of a plurality of pairs of damping rods, and each pair of damping rods is installed in a damping rod through hole; the shape of the damping plate is the same as the shape of the cross section of the rotor core, the two damping plates are arranged one by one at the two ends of the rotor core, and the damping rod through holes are axially opened on the two damping plates corresponding to the damping rod through holes on the rotor core, so that the two ends of each pair of damping rods pass through the damping rod through holes of the two damping plates one by one and are welded to the two damping plates; The rotating shaft is press-fitted into the shaft hole of the shaftless rotor; The rotor winding comprises four rotor coils, eight pairs of coil support blocks and four groups of coil pressing blocks; The four rotor coils are wound one by one on the pole bodies of the four magnetic poles of the rotor core, and insulating glue is applied on the contact surfaces between the four rotor coils and the rotor core, and insulating glue is also applied between the layers of each rotor coil; eight pairs of coil support blocks are arranged one by one between the inner surfaces of the two ends of the four rotor coils and the outer surfaces of the two damping plates; four groups of coil pressing blocks are arranged one by one in the four inter-pole spaces along the length direction of the rotor core, and the two side surfaces of each group of coil pressing blocks radially press two adjacent rotor coils.

2. The rotor structure of the high impedance generator according to claim 1, characterized in that: The rotor core is formed by laminating high magnetic permeability silicon steel sheets.

3. The rotor structure of the high impedance generator according to claim 1, characterized in that: The damping rod, the coil support block and the coil pressing block are all made of aluminum.

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