Rotor bracket structure of multi-phase outer pivot brushless exciter

Abstract

The invention discloses a rotor bracket structure of a multi-phase outer pivot brushless exciter, belongs to the field of brushless exciters, and aims to solve the problem that screws for fixing balancing weights of a rotor bracket of an existing multi-phase outer pivot brushless exciter are loosened and fall off. The large balance weight groove is composed of a first groove opening part and a first groove bottom, the width of the large balance weight is matched with the width of the first groove bottom, the first jacking screw comprises a first screw rod part and a first cap head part which are axially connected, and the diameter of the first cap head part is smaller than the width of the first groove bottom and larger than the width of the first groove opening part. The large balancing weight is in threaded fit with the first screw rod part, when the large balancing weight is fixed, the first jacking screw is screwed, so that the first cap part is far away from the large balancing weight, the large balancing weight jacks the bottom surface of the bottom of the first groove, and the first cap part jacks the top surface of the bottom of the first groove. The positions of the large balancing weight and the small balancing weight can be adjusted smoothly, and screws for fixing the large balancing weight and the small balancing weight can be prevented from loosening and falling off.

Description

Technical Field

[0001] The invention belongs to the field of brushless exciters, and particularly relates to a rotor bracket structure of a polyphase outer-rotating-pivot brushless exciter. Background Art

[0002] The excitation system is an indispensable part of the generator auxiliary equipment. An excellent excitation system can not only ensure the constancy of the terminal voltage of the machine but also improve the stability of the generator and the power system. The brushless excitation system composed of an AC exciter and a rotating rectifier has the advantages of fast excitation regulation speed and voltage rising speed, and there is no brush device, which avoids the pollution of carbon powder to the stator and rotor coils. It is the most widely used excitation method in the existing excitation systems at present.

[0003] The outer-rotating-pivot brushless exciter has the characteristics of a brushless excitation system and also has advantages such as high power density, high torque, and high efficiency. With the continuous increase of the generator capacity, especially in the case of million-kilowatt steam turbines, the capacity of the outer-rotating-pivot brushless exciter is also getting larger and larger, and the requirements for the rotor bracket of the outer-rotating-pivot brushless exciter are also getting higher and higher. The traditional cantilever rotor bracket is bolted to the main shaft of the generator at one end face. Since the rotating rectifier and the AC exciter need to be installed inside the cantilever rotor bracket, the axial length of the cantilever rotor bracket increases, the deflection of the shafting increases, resulting in poor vibration stability, poor sealing performance under high temperature and high speed conditions, and abnormal vibration, noise and accelerated wear of the sealing parts generated during the operation of the outer-rotating-pivot brushless exciter. Frequent shutdown maintenance can increase the maintenance cost, affect the production progress and economic benefits.

[0004] Chinese Patent Invention Publication No. CN119727183A discloses a rotor bracket structure of a polyphase outer-rotating-pivot brushless exciter. On the basis of the traditional cantilever rotor bracket structure, a circular support ring plate, a radial support ring plate and a rectangular rib are added inside the rotor bracket, which greatly improves the strength and stability of the rotor bracket, thereby ensuring the normal operation and long-term use of the excitation equipment. However, in this invention, large counterweight grooves are opened on the outer side of the rotor bracket body, small counterweight grooves are opened at one end, and counterweight blocks are arranged in the large and small counterweight grooves to adjust the center of gravity of the rotor to be on the rotation axis. If the gap between the counterweight block and the counterweight groove is too small, it is difficult to move and adjust. If the gap between the counterweight block and the counterweight groove is sufficient, screws need to be used for fastening, and it is difficult to accurately determine the appropriate position of the screw holes on the rotor bracket. Under the influence of high-speed rotation and vibration of the rotor, there is a risk of loosening and falling off of the screws. Summary of the Invention

[0005] The object of the present invention is to provide a rotor bracket structure for a polyphase externally rotating brushless exciter, so as to solve the problem that the screws for fixing the counterweight on the rotor bracket of the existing polyphase externally rotating brushless exciter are prone to loosening and falling off. The technical solution adopted by the present invention is as follows:

[0006] A rotor bracket structure for a polyphase externally rotating brushless exciter, comprising a rotor bracket body, a rotating rectifier and an AC exciter. The rotor bracket body is cylindrical. A connecting plate is provided at the left end of the rotor bracket body, and the connecting plate is connected to the rotating shaft of the main machine. The outer circumference of the rotating rectifier and the outer circumference of the AC exciter are both fitted with the inner circumference of the rotor bracket body. The rotating rectifier is located in the left part of the rotor bracket body, and the AC exciter is located in the right part of the rotor bracket body. The rotating rectifier is circumferentially fitted and limited with the rotor bracket body through a pair of short flat keys, and the AC exciter is circumferentially fitted and limited with the rotor bracket body through a pair of long flat keys. A large counterweight groove is circumferentially formed on the outer peripheral wall of the rotor bracket body, and an annular small counterweight groove is formed on the right end face of the rotor bracket body;

[0007] The large counterweight groove is composed of a first notch part with a rectangular cross section and a first bottom part. The width of the first bottom part is greater than the width of the first notch part. The first notch part and the first bottom part are connected to form a T-shaped groove. The width of the large counterweight block is adapted to the width of the first bottom part. The first pressing screw comprises a first screw part and a first cap head which are axially connected. A cross slot, a flat slot or a hexagonal counterbore is provided on the outer end face of the first cap head. The diameter of the first cap head is smaller than the width of the first bottom part and larger than the width of the first notch part. The large counterweight block is in threaded cooperation with the first screw part. The sum of the heights of the large counterweight block and the first cap head is smaller than the height of the first bottom part. When adjusting the position of the large counterweight block, the first pressing screw is screwed to make the first cap head close to the large counterweight block. The large counterweight block and the first pressing screw are jointly slidably arranged in the first bottom part, and the first cap head faces the first notch part. When fixing the large counterweight block, a tool is inserted through the first notch part to screw the first pressing screw to make the first cap head away from the large counterweight block. The large counterweight block presses the bottom surface of the first bottom part, and the first cap head presses the top surface of the first bottom part;

[0008] The small counterweight groove is composed of a second notch part with a rectangular cross-section and a second bottom part. The width of the second bottom part is greater than that of the second notch part. The second notch part and the second bottom part are connected to form a T-shaped groove. The width of the small counterweight block is adapted to the width of the second bottom part. The second pressing screw includes a second screw part and a second cap head axially connected. A cross groove, a slotted head or a hexagonal countersunk hole is provided on the outer end surface of the second cap head. The diameter of the second cap head is smaller than the width of the second bottom part and larger than the width of the second notch part. The small counterweight block is in threaded fit with the second screw part. The sum of the heights of the small counterweight block and the second cap head is smaller than the height of the second bottom part. When adjusting the position of the small counterweight block, the second pressing screw is screwed to make the second cap head approach the small counterweight block. The small counterweight block and the second pressing screw are jointly and slidably arranged in the second bottom part. The second cap head faces the second notch part. When fixing the small counterweight block, the second pressing screw is screwed through the second notch part by inserting a tool, so that the second cap head is far away from the small counterweight block. The small counterweight block presses the bottom surface of the second bottom part, and the second cap head presses the top surface of the second bottom part.

[0009] Further, a circular support ring plate is arranged in the middle of the inner circumference of the rotor bracket body. A radial support ring plate is provided between the rotating rectifier and the circular support ring plate. The outer circumference of the radial support ring plate is connected to the inner circumference of the rotor bracket body. A plurality of rectangular ribs are circumferentially arranged on the inner circumferential wall of the rotor bracket body. The plurality of rectangular ribs are located between the AC exciter and the circular support ring plate. The circular support ring plate is connected to the plurality of rectangular ribs.

[0010] Further, a plurality of rectangular grooves are evenly and circumferentially arranged on the inner circumferential wall of the left part of the rotor bracket body. A plurality of rectangular bosses are evenly arranged on the outer circumference of the radial support ring plate. The plurality of rectangular bosses are in one-to-one correspondence and cooperate with the plurality of rectangular grooves. A rectangular square hole is provided on the rectangular boss.

[0011] Further, a plurality of fastening screw holes penetrating the rotor bracket body are provided on the bottom of each rectangular groove. A plurality of light holes penetrating the radial support ring plate are provided on the outer edge end surface of each rectangular boss. The plurality of fastening screw holes and the plurality of light holes are in one-to-one correspondence.

[0012] Further, a plurality of axial ventilation round holes are evenly arranged on the circular support ring plate in a circumferential manner. A plurality of square holes are also evenly arranged on the circular support ring plate in a circumferential manner. The plurality of square holes are located outside the plurality of axial ventilation round holes. The plurality of square holes are correspondingly arranged between a plurality of adjacent axial ventilation round holes.

[0013] Further, a plurality of rectifying connection blocks are arranged on the radial support ring plate in a circumferential manner. The armature winding lead-out wire of the AC exciter passes through the square hole and is connected to the rectifying connection block. The rectifying connection block is connected to the input terminal of the rotating rectifier through a connecting piece. The positive and negative conductive plates at the output end of the rotating rectifier are connected to the positive and negative conductive rods in the rotating shaft.

[0014] Further, a plurality of connecting screw holes are formed at the left end of the rotor bracket body, and a plurality of bolts pass through the connecting plate and are fixedly connected to the plurality of connecting screw holes in one-to-one correspondence.

[0015] Further, an annular double-layer wind shielding boss is provided on the outer peripheral wall of the right part of the rotor bracket body.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. One or several groups of matching large counterweight blocks and first pressing screws are arranged in the large counterweight groove, and one or several groups of matching small counterweight blocks and second pressing screws are arranged in the small counterweight groove, which can meet the requirements of the rotor for counterweight balance blocks at different positions with different distances and angles. Since the diameter of the first cap head is larger than the width of the first notch, the first pressing screw will not break away from the large counterweight groove, and the diameter of the second cap head is larger than the width of the second notch, so the second pressing screw will not break away from the small counterweight groove. It can not only smoothly adjust the positions of the large and small counterweight blocks, but also prevent the screws fixing the large and small counterweight blocks from loosening and falling off.

[0018] 2. The circular support ring plate, the radial support ring plate and several rectangular ribs can effectively prevent the rotor bracket body from deforming and improve the strength of the rotor bracket body.

[0019] 3. The large circular hole in the middle of the circular support ring plate can meet the requirements of installation and axial ventilation. The axial ventilation circular holes formed on the circular support ring plate can meet the requirements of axially and closely taking away the surface loss in the AC exciter and the rotating rectifier. The square holes on the circular support ring plate can effectively support the lead-out wires of the AC exciter armature winding and protect them from being damaged and broken during high-speed rotation.

[0020] 4. The outer surface of the rectifying connection block is closely attached to the inner circle of the radial support ring plate. When the whole rotor rotates at high speed, under the action of centrifugal force, the rectifying connection block is radially pressed against the inner circumference of the radial support ring plate, and the radial support ring plate is fixedly connected with the rotor bracket body as a whole, which can effectively protect the rectifying connection block from radial displacement and damage and fracture.

[0021] 5. The double-layer wind shielding boss near the outer end of the rotor bracket body can effectively control the wind flow direction, reduce wind resistance and improve the utilization rate of cooling air. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a sectional view of the present invention connected to the rotating shaft;

[0023] Figure 2 is Figure 1 the A-A sectional view of

[0024] Figure 3 is an axonometric view of the present invention;

[0025] Figure 4 It is a sectional view showing the connection between the rotor support body, the connecting plate and the radial support ring plate;

[0026] Figure 5 It is a sectional view showing the connection between the rotor support body and the radial support ring plate;

[0027] Figure 6 It is a schematic diagram of the connecting plate;

[0028] Figure 7 It is a schematic diagram of the radial support ring plate;

[0029] Figure 8 It is a half-sectional view showing the cooperation between the rotor support body and the radial support ring plate;

[0030] Figure 9 It is Figure 8 An enlarged view of part B;

[0031] Figure 10 It is Figure 8 An enlarged view of part C;

[0032] Figure 11 It is a schematic structural diagram of the first pressing screw;

[0033] Figure 12 It is a schematic structural diagram of the second pressing screw.

[0034] In the figure, 1 - rotor support body; 2 - connecting plate; 3 - radial support ring plate; 4 - rotating shaft; 5 - rotating rectifier; 6 - short flat key; 7 - alternating current exciter; 8 - long flat key; 9 - circular support ring plate; 10 - axial ventilation round hole; 11 - armature winding lead-out wire; 12 - square hole; 13 - rectangular rib; 14 - rectangular groove; 15 - large counterweight groove; 16 - double-layer wind-shielding boss; 17 - fastening screw hole; 18 - rectangular boss; 19 - rectangular square hole; 20 - clearance hole; 21 - connecting screw hole; 22 - small counterweight groove; 23 - rectifying connection block; 24 - connecting piece; 25 - input terminal; 26 - positive and negative conductive plates; 27 - positive and negative conductive rods; 28 - large counterweight block; 29 - first pressing screw; 30 - bottom of the first groove; 31 - mouth of the first groove; 32 - small counterweight block; 33 - second pressing screw; 34 - bottom of the second groove; 35 - mouth of the second groove; 36 - first screw part; 37 - first cap head; 38 - second screw part; 39 - second cap head. Specific implementation manner

[0035] To make the objectives, technical solutions, and advantages of the present invention more clear and understandable, 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.

[0036] The connections mentioned in the present invention are divided into fixed connections and detachable connections. The fixed connection is an undetachable connection, including but not limited to conventional fixed connection methods such as hemming connection, rivet connection, bonding connection, and welding connection. The detachable connection includes but not limited to conventional detaching methods such as bolt connection, snap connection, pin connection, and hinge connection. When the specific connection method is not clearly defined, it is defaulted that at least one connection method can be found among the existing connection methods to achieve this function, and those skilled in the art can select according to their needs. For example: welding connection is selected for the fixed connection, and bolt connection is selected for the detachable connection.

[0037] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, and the present invention is not limited to the following embodiments.

[0038] Embodiment: As Figures 1 to 12 shown, a rotor bracket structure of a polyphase outer-rotating pivot brushless exciter includes a rotor bracket body 1, a rotating rectifier 5, and an AC exciter 7. The rotor bracket body 1 is cylindrical. A connecting plate 2 is provided at the left end of the rotor bracket body 1. The connecting plate 2 is connected to the rotating shaft 4 of the main machine. The outer circumference of the rotating rectifier 5 and the outer circumference of the AC exciter 7 are both fitted with the inner circumference of the rotor bracket body 1. The rotating rectifier 5 is located in the left part of the rotor bracket body 1, and the AC exciter 7 is located in the right part of the rotor bracket body 1. The rotating rectifier 5 is circumferentially fitted and limited with the rotor bracket body 1 through a pair of short flat keys 6. The AC exciter 7 is circumferentially fitted and limited with the rotor bracket body 1 through a pair of long flat keys 8. Large counterweight grooves 15 are circumferentially formed on the outer peripheral wall of the rotor bracket body 1, and an annular small counterweight groove 22 is formed on the right end face of the rotor bracket body 1;

[0039] The large counterweight groove 15 is composed of a first notch part 31 with a rectangular cross-section and a first bottom part 30 of the groove. The width of the first bottom part 30 of the groove is greater than the width of the first notch part 31. The first notch part 31 and the first bottom part 30 of the groove are connected to form a T-shaped groove. The width of the large counterweight block 28 is adapted to the width of the first bottom part 30 of the groove. The first pressing screw 29 includes a first screw part 36 and a first cap part 37 axially connected. A cross groove, a slotted head or a countersunk hexagon socket is provided on the outer end surface of the first cap part 37. The diameter of the first cap part 37 is less than the width of the first bottom part 30 of the groove and greater than the width of the first notch part 31. An opening for the large counterweight block 28 to enter and exit the first bottom part 30 of the groove is provided on the large counterweight groove 15. The large counterweight block 28 is provided with a first adjusting screw hole arranged in the height direction. The large counterweight block 28 is in threaded cooperation with the first screw part 36 through the first adjusting screw hole. The sum of the heights of the large counterweight block 28 and the first cap part 37 is less than the height of the first bottom part 30 of the groove. When adjusting the position of the large counterweight block 28, the first pressing screw 29 is screwed, so that the first cap part 37 approaches the large counterweight block 28. The large counterweight block 28 and the first pressing screw 29 are jointly arranged to slide in the first bottom part 30 of the groove. The first cap part 37 faces the first notch part 31. When fixing the large counterweight block 28, a tool is inserted through the first notch part 31 to screw the first pressing screw 29, so that the first cap part 37 is away from the large counterweight block 28. The large counterweight block 28 presses the bottom surface of the first bottom part 30 of the groove, and the first cap part 37 presses the top surface of the first bottom part 30 of the groove;

[0040] The small counterweight groove 22 is composed of a second notch part 35 with a rectangular cross-section and a second bottom part 34. The width of the second bottom part 34 is greater than that of the second notch part 35. The second notch part 35 and the second bottom part 34 are connected to form a T-shaped groove. The width of the small counterweight block 32 is adapted to the width of the second bottom part 34. The second pressing screw 33 includes a second screw part 38 and a second cap part 39 that are axially connected. A cross groove, a slotted head or a countersunk hexagon socket is provided on the outer end face of the second cap part 39. The diameter of the second cap part 39 is smaller than the width of the second bottom part 34 and greater than the width of the second notch part 35. An opening is provided on the small counterweight groove 22 for the small counterweight block 32 to enter and exit the second bottom part 34. The small counterweight block 32 is provided with a second adjusting screw hole arranged in the height direction. The small counterweight block 32 is in threaded cooperation with the second screw part 38 through the second adjusting screw hole. The sum of the heights of the small counterweight block 32 and the second cap part 39 is smaller than the height of the second bottom part 34. When adjusting the position of the small counterweight block 32, the second pressing screw 33 is screwed, so that the second cap part 39 approaches the small counterweight block 32. The small counterweight block 32 and the second pressing screw 33 are slidably arranged in the second bottom part 34 together. The second cap part 39 faces the second notch part 35. When fixing the small counterweight block 32, a tool is inserted through the second notch part 35 to screw the second pressing screw 33, so that the second cap part 39 is away from the small counterweight block 32. The small counterweight block 32 presses the bottom surface of the second bottom part 34, and the second cap part 39 presses the top surface of the second bottom part 34.

[0041] One group or several groups of matching large counterweight blocks 28 and first pressing screws 29 are arranged in the large counterweight groove 15, and one group or several groups of matching small counterweight blocks 32 and second pressing screws 33 are arranged in the small counterweight groove 22, which can meet the requirements of the rotor for multi-position counterweight balance blocks at different distances and different angles. Since the diameter of the first cap part 37 is greater than the width of the first notch part 31, the first pressing screw 29 will not break away from the large counterweight groove 15. Since the diameter of the second cap part 39 is greater than the width of the second notch part 35, the second pressing screw 33 will not break away from the small counterweight groove 22. It can not only smoothly adjust the positions of the large counterweight block 28 and the small counterweight block 32, but also prevent the screws for fixing the large counterweight block 28 and the small counterweight block 32 from loosening and falling off.

[0042] A circular support ring plate 9 is arranged in the middle of the inner circumference of the rotor bracket body 1. A radial support ring plate 3 is arranged between the rotating rectifier 5 and the circular support ring plate 9. The outer circumference of the radial support ring plate 3 is connected to the inner circumference of the rotor bracket body 1. A plurality of rectangular ribs 13 are arranged circumferentially on the inner circumferential wall of the rotor bracket body 1. The plurality of rectangular ribs 13 are located between the alternating current exciter 7 and the circular support ring plate 9. The circular support ring plate 9 is connected to the plurality of rectangular ribs 13. Through the circular support ring plate 9, the radial support ring plate 3 and the plurality of rectangular ribs 13, the deformation of the rotor bracket body 1 can be effectively avoided, and the strength of the rotor bracket body 1 can be improved.

[0043] On the inner peripheral wall of the left part of the rotor bracket body 1, a number of rectangular grooves 14 are circumferentially and evenly arranged. A large round hole is provided in the middle of the radial support ring plate 3. A number of rectangular bosses 18 are evenly arranged on the outer circumference of the radial support ring plate 3. The number of rectangular bosses 18 cooperates with the number of rectangular grooves 14 one by one. To meet the cooling requirements, rectangular square holes 19 are provided on the rectangular bosses 18. The large round hole in the middle of the circular support ring plate 9 can meet the requirements of installation and axial ventilation. The axial ventilation round holes 10 provided on the circular support ring plate 9 can meet the requirements of axially taking away the surface losses in the AC exciter 7 and the rotating rectifier 5 at a short distance. The square holes 12 on the circular support ring plate 9 can effectively support the armature winding lead-out wire 11 of the AC exciter 7 and protect it from being easily damaged and broken during high-speed rotation.

[0044] On the bottom of each rectangular groove 14, a number of stud holes 17 penetrating the rotor bracket body 1 are provided. On the outer edge end surface of each rectangular boss 18, a number of clearance holes 20 penetrating the radial support ring plate 3 are provided. The number of stud holes 17 corresponds to the number of clearance holes 20 one by one and is used to fasten and fix the radial support ring plate 3 and the rotor bracket body 1 with screws.

[0045] To meet the requirements of installation and cooling, a large round hole is provided in the middle of the circular support ring plate 9. To meet the cooling requirements, a number of axial ventilation round holes 10 are circumferentially and evenly arranged on the circular support ring plate 9. To meet the wiring requirements, a number of square holes 12 are also circumferentially and evenly arranged on the circular support ring plate 9. The number of square holes 12 is located outside the number of axial ventilation round holes 10, and the number of square holes 12 is provided between a number of adjacent axial ventilation round holes 10 one by one.

[0046] A number of rectifier connection blocks 23 are arranged on the circumference of the radial support ring plate 3. The armature winding lead-out wire 11 of the AC exciter 7 passes through the square hole 12 and is connected to the rectifier connection block 23. The rectifier connection block 23 is connected to the input terminal 25 of the rotating rectifier 5 through a connecting piece 24. The positive and negative conductive plates 26 at the output end of the rotating rectifier 5 are connected to the positive and negative conductive rods 27 in the rotating shaft 4.

[0047] The outer surface of the rectifier connection block 23 is closely attached to the inner circle of the radial support ring plate 3. When the whole rotor rotates at a high speed, under the action of centrifugal force, the rectifier connection block 23 is radially pressed against the inner circumference of the radial support ring plate 3, and the radial support ring plate 3 and the rotor bracket body 1 are fastened into a whole, which can effectively protect the rectifier connection block 23 from radial displacement and damage and fracture.

[0048] A number of connecting screw holes 21 are provided at the left end of the rotor bracket body 1. A number of bolts pass through the connecting plate 2 and are fastened and connected to the number of connecting screw holes 21 one by one.

[0049] An annular double-layer wind shielding boss 16 is provided on the outer peripheral wall of the right part of the rotor bracket body 1. The double-layer wind shielding boss 16 near the outer end of the rotor bracket body 1 can effectively control the flow direction of the wind, reduce wind resistance, and improve the utilization rate of the cooling wind.

[0050] The above embodiments are only illustrative descriptions of the present invention and do not limit its protection scope. Those skilled in the art can also make partial changes to it. As long as they do not exceed the spiritual essence of the present invention, they are within the protection scope of the present invention.

Claims

1. A rotor bracket structure of a polyphase outer-rotor brushless exciter, characterized in that: It includes a rotor bracket body (1), a rotating rectifier (5) and an alternating current exciter (7). The rotor bracket body (1) is cylindrical. A connecting plate (2) is provided at the left end of the rotor bracket body (1). The connecting plate (2) is connected to the rotating shaft (4) of the main machine. The outer circumference of the rotating rectifier (5) and the outer circumference of the alternating current exciter (7) are both fitted with the inner circumference of the rotor bracket body (1). The rotating rectifier (5) is located in the left part of the rotor bracket body (1), and the alternating current exciter (7) is located in the right part of the rotor bracket body (1). The rotating rectifier (5) is circumferentially fitted and limited with the rotor bracket body (1) through a pair of short flat keys (6). The alternating current exciter (7) is circumferentially fitted and limited with the rotor bracket body (1) through a pair of long flat keys (8). A large counterweight groove (15) is circumferentially formed on the outer peripheral wall of the rotor bracket body (1), and an annular small counterweight groove (22) is formed on the right end face of the rotor bracket body (1); The large counterweight groove (15) is composed of a first notch part (31) with a rectangular cross-section and a first groove bottom (30). The width of the first groove bottom (30) is greater than the width of the first notch part (31). The first notch part (31) and the first groove bottom (30) are connected to form a T-shaped groove. The width of the large counterweight block (28) is adapted to the width of the first groove bottom (30). The first pressing screw (29) includes a first screw part (36) and a first cap head part (37) axially connected. A cross groove, a straight groove or a hexagonal counterbore is provided on the outer end face of the first cap head part (37). The diameter of the first cap head part (37) is less than the width of the first groove bottom (30) and greater than the width of the first notch part (31). The large counterweight block (28) is in threaded cooperation with the first screw part (36). The sum of the heights of the large counterweight block (28) and the first cap head part (37) is less than the height of the first groove bottom (30). When adjusting the position of the large counterweight block (28), turn the first pressing screw (29) to make the first cap head part (37) approach the large counterweight block (28). The large counterweight block (28) and the first pressing screw (29) are jointly slidably arranged in the first groove bottom (30). The first cap head part (37) faces the first notch part (31). When fixing the large counterweight block (28), insert a tool through the first notch part (31) to turn the first pressing screw (29) to make the first cap head part (37) move away from the large counterweight block (28). The large counterweight block (28) presses the bottom surface of the first groove bottom (30), and the first cap head part (37) presses the top surface of the first groove bottom (30); The small counterweight groove (22) is composed of a second notch part (35) with a rectangular cross-section and a second bottom part (34) of the groove. The width of the second bottom part (34) of the groove is greater than the width of the second notch part (35). The second notch part (35) and the second bottom part (34) of the groove are connected to form a T-shaped groove. The width of the small counterweight block (32) is adapted to the width of the second bottom part (34) of the groove. The second pressing screw (33) includes a second screw part (38) and a second cap head part (39) that are axially connected. A cross slot, a slotted head or a countersunk hexagon socket is provided on the outer end face of the second cap head part (39). The diameter of the second cap head part (39) is smaller than the width of the second bottom part (34) of the groove and greater than the width of the second notch part (35). The small counterweight block (32) is in threaded cooperation with the second screw part (38). The sum of the heights of the small counterweight block (32) and the second cap head part (39) is smaller than the height of the second bottom part (34) of the groove. When adjusting the position of the small counterweight block (32), the second pressing screw (33) is screwed, so that the second cap head part (39) approaches the small counterweight block (32). The small counterweight block (32) and the second pressing screw (33) are jointly and slidably arranged in the second bottom part (34) of the groove. The second cap head part (39) faces the second notch part (35). When fixing the small counterweight block (32), a tool is inserted through the second notch part (35) to screw the second pressing screw (33), so that the second cap head part (39) moves away from the small counterweight block (32). The small counterweight block (32) presses the bottom surface of the second bottom part (34) of the groove, and the second cap head part (39) presses the top surface of the second bottom part (34) of the groove.

2. The rotor bracket structure of a polyphase externally-rotating brushless exciter according to claim 1, wherein: A circular support ring plate (9) is arranged in the middle of the inner circumference of the rotor bracket body (1). A radial support ring plate (3) is arranged between the rotating rectifier (5) and the circular support ring plate (9). The outer circumference of the radial support ring plate (3) is connected to the inner circumference of the rotor bracket body (1). A plurality of rectangular ribs (13) are circumferentially arranged on the inner circumferential wall of the rotor bracket body (1). The plurality of rectangular ribs (13) are located between the AC exciter (7) and the circular support ring plate (9). The circular support ring plate (9) is connected to the plurality of rectangular ribs (13).

3. The rotor bracket structure of a polyphase outer rotating pivot brushless exciter according to claim 2, characterized in that: A plurality of rectangular grooves (14) are evenly arranged in a circumferential direction on the inner circumferential wall of the left part of the rotor bracket body (1). A plurality of rectangular bosses (18) are evenly arranged on the outer circumference of the radial support ring plate (3) in a circumferential direction. The plurality of rectangular bosses (18) are in one-to-one correspondence and cooperate with the plurality of rectangular grooves (14). A rectangular square hole (19) is opened on the rectangular boss (18).

4. The rotor bracket structure of a polyphase outer rotating pivot brushless exciter according to claim 3, wherein: A plurality of fastening screw holes (17) penetrating the rotor bracket body (1) are opened on the bottom of each rectangular groove (14). A plurality of light holes (20) penetrating the radial support ring plate (3) are opened on the outer edge end face of each rectangular boss (18). The plurality of fastening screw holes (17) and the plurality of light holes (20) are in one-to-one correspondence.

5. A rotor bracket structure of a polyphase outer-rotating pivot brushless exciter according to claim 2, characterized in that: A number of axial ventilation round holes (10) are evenly distributed on the circumference of the circular support ring plate (9). A number of square holes (12) are also evenly distributed on the circumference of the circular support ring plate (9). The number of square holes (12) is located outside the number of axial ventilation round holes (10), and the number of square holes (12) are respectively opened between a number of adjacent axial ventilation round holes (10).

6. The rotor support structure of a polyphase outer rotating pivot brushless exciter according to claim 5, characterized in that: A number of rectifying connection blocks (23) are arranged on the circumference of the radial support ring plate (3). The armature winding lead-out wire (11) of the alternating current exciter (7) passes through the square hole (12) and is connected to the rectifying connection block (23). The rectifying connection block (23) is connected to the input terminal (25) of the rotating rectifier (5) through a connecting piece (24). The positive and negative conductive plates (26) at the output end of the rotating rectifier (5) are connected to the positive and negative conductive rods (27) in the rotating shaft (4).

7. A rotor bracket structure of a polyphase outer-rotating pivot brushless exciter according to claim 1, characterized in that: A number of connecting screw holes (21) are opened at the left end of the rotor bracket body (1). A number of bolts pass through the connecting plate (2) and are respectively and tightly connected to the number of connecting screw holes (21).

8. A rotor support structure of a polyphase outer-rotating brushless exciter according to any one of claims 1-7, characterized in that: An annular double-layer wind shielding boss (16) is arranged on the outer peripheral wall of the right part of the rotor bracket body (1).

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