Method for shaping end part of excitation coil of rotor of two-pole three-phase brushless synchronous generator
By setting annular steps and gaps on the outside of the rotor core of the two-pole three-phase brushless synchronous generator, and using specific shaping tools, efficient shaping of the end of the excitation coil is achieved, and irregular and dynamic winding ends are solved under high-speed rotation. The problem of balance.
Patent Information
- Application Number
- CN202411425482.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-02-25
AI Technical Summary
During the process of shaping the end of the large-span two-pole rotor coil with high-speed rotation, the prior art is difficult to ensure efficient and high-quality shaping, resulting in irregular winding end sizes and insufficient concentricity, which affects the motor dynamic balance.
A two-pole three-phase brushless synchronous generator rotor excitation coil end shaping method is adopted. By setting an annular step and annular gap on the outer facade of the rotor core, and using annular support plate, an arc-shaped plastic plate and a positioning ring, etc. , realize the shaping and positioning of the end windings.
This method overcomes the problem of loose deformation of the winding ends under high-speed rotation, ensures the normativeness and concentricity of the winding ends, improves the dynamic balance of the motor, and provides convenient conditions for subsequent installation of steel guard rings.
Smart Images
Figure CN119519322A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a magnetic pole excitation coil of a generator rotor, in particular to an end shaping method of a two-pole three-phase brushless synchronous generator rotor excitation coil. Background Art
[0002] The rotor core of the three-phase brushless synchronous generator is divided into two types: salient pole core structure and non-salient pole structure. The excitation winding is wound on the outer surface of the salient pole core to form a salient pole magnetic pole, and the non-salient pole magnetic pole is formed by embedding a group of concentric coils into the wire embedding groove of the non-salient pole core. The preparation of the rotor of the three-phase brushless synchronous generator with non-salient pole magnetic pole structure is completed by the following process: first complete the winding of the concentric excitation coil group, then embed the concentric excitation coil group into the corresponding core slot on the rotor to form the N-pole excitation coil and S-pole excitation coil of the motor rotor, and then embed the N-pole excitation coil into the corresponding core slot on the rotor. The ring and the S-pole excitation coil are connected in series and connected to the excitation power supply, forming invisible magnetic poles with alternating N-pole and S-pole of the generator on the rotor, and the motor rotor magnetic poles are formed by the excitation power supply; since the excitation winding ends of the invisible pole type magnetic pole are suspended outside the two ends of the rotor core, the suspended core ends will be subjected to a large centrifugal force during the high-speed rotation of the rotor. If the ends of the magnetic pole coils in the rotor core are not on the same circumference, the initial balance of the rotor will increase, making the motor unable to pass the dynamic balancing test; the prior art is to insert a prefabricated glass fiber reinforced plastic ring into the end of the excitation coil of the rotor of the three-phase brushless synchronous generator Or the end of the coil can be directly wound with a non-weft band hoop to complete the positioning and fixing of the coil end, so that the winding end will not become loose and deformed when the motor rotor rotates, and it can pass the dynamic balance test smoothly; but for motors with a speed greater than 3000 revolutions per minute, a prefabricated steel guard ring is generally used, and the steel guard ring is inserted into the end of the suspended rotor core coil to restrain and position the winding end, so that the outer circles of each excitation winding are on the same circumference; but since the outer circle assembly size of the steel guard ring and the rotor coil is small, the end of the rotor coil must be adjusted The shape must meet the requirements of steel guard ring installation. How to efficiently complete the high-quality shaping of the end of the motor rotor excitation coil has become a problem that needs to be solved during on-site assembly; in addition, since the steel guard ring can only shape and position the outer circle of the end winding of the suspended electrode rotor excitation coil, but has no restrictions on the inner circle of the suspended end winding, there is also an uneven gap between the suspended winding end and the outer side of the rotor shaft. If the inner circle of the rotor end winding is not properly shaped, it will also affect the dynamic balance of the motor during rotation. How to solve this problem has become an issue that needs to be paid attention to in the assembly of motor rotor windings. Summary of the invention
[0003] The invention provides a method for shaping the end of a rotor excitation coil of a two-pole three-phase brushless synchronous generator, which solves the technical problem of how to efficiently and high-quality position and shape the end of the excitation coil on the motor rotor core.
[0004] The present invention solves the above technical problems through the following technical solutions: A two-pole three-phase brushless synchronous generator rotor excitation coil end shaping tool, including a motor shaft end and an end winding of the excitation coil, an annular step is arranged on the outer side elevation of the rotor core outside the end winding, and an annular gap is arranged between the motor shaft end and the inner side surface of the end winding; an annular support plate is sleeved on the motor shaft end on the right side of the end winding, an arc-shaped shaping plate is spliced between the annular step and the annular support plate, the inner arc surface of the arc-shaped shaping plate is pressed onto the end winding, a left arc-shaped step is arranged on the inner arc surface of the left end of the arc-shaped shaping plate, and a right arc-shaped step is arranged on the inner arc surface of the right end of the arc-shaped shaping plate, and the left arc-shaped step and the annular step are connected. The steps are movably matched together, and the right arc-shaped step is movably matched with the annular support plate; eight arc-shaped shaping plates are spliced into a shaping ring, and a first positioning ring and a second positioning ring are movably sleeved on the outside of the shaping ring, the first positioning ring and the second positioning ring are arranged parallel to each other, and are connected into a whole through ring connecting pins arranged at equal intervals of arc, an annular groove track is arranged between the first positioning ring and the second positioning ring, an I-shaped arc-shaped slider is movably arranged in the annular groove track, a radial top screw screw hole is arranged on the I-shaped arc-shaped slider, a radial top screw is screwed in the radial top screw screw hole, and the inner end of the radial top screw is connected to the outer side surface of the arc-shaped shaping plate.
[0005] An inner upper arc pad and an inner lower arc pad are respectively arranged in the annular gap, and the inner upper arc pads are spliced into a circular ring, and the inner lower arc pads are spliced into a circular ring; a second group of shaped outer rings composed of a third positioning ring and a fourth positioning ring are arranged in parallel on the outer side of the end winding, and the structure of the second group of shaped outer rings is exactly the same as the structure of the first group of shaped outer rings composed of the first positioning ring and the second positioning ring.
[0006] An annular rubber shaping pressure plate is arranged on the right side vertical surface of the end winding, and side top screw threading holes are arranged at equal intervals on the same circumference of the annular support plate. Side top screws are screwed in the side top screw threading holes, and the inner ends of the side top screws are connected to the right side vertical surface of the annular rubber shaping pressure plate.
[0007] A method for shaping the end of a rotor excitation coil of a two-pole three-phase brushless synchronous generator includes a motor shaft end and an end winding of an excitation coil, an annular step is provided on the outer side elevation of a rotor core outside the end winding, and an annular gap is provided between the motor shaft end and the inner side of the end winding; the insulation wrapping method includes the following steps: The first step is to arrange an inner upper arc pad and an inner lower arc pad in the annular gap, wherein the inner upper arc pads are spliced into a circular ring, and the inner lower arc pads are spliced into a circular ring, and the two circular rings realize the support and positioning of the inner side surface of the end winding; Step 2: Take the annular rubber shaping plate and sleeve it on the end of the motor shaft so that the annular rubber shaping plate is close to the right side of the end winding; The third step is to manufacture an annular support plate and eight arc-shaped shaping plates respectively, so that the diameter of the annular support plate is equal to the diameter of the annular step, and side top screw holes are arranged at equal intervals on the same circumference of the annular support plate; a left arc-shaped step is arranged on the inner arc surface of the left end of the arc-shaped shaping plate, and a right arc-shaped step is arranged on the inner arc surface of the right end of the arc-shaped shaping plate, so that the eight arc-shaped shaping plates are spliced into a circular ring; The fourth step is to sleeve the annular support plate onto the shaft end of the motor shaft, and to arrange the arc-shaped shaping plate between the annular step and the annular support plate; Step 5: Make a first positioning ring and a second positioning ring with a diameter larger than that of the motor rotor, set the first positioning ring and the second positioning ring parallel to each other, and connect them into a whole through a ring connecting pin arranged at equal intervals, an annular groove track is arranged between the first positioning ring and the second positioning ring, an I-shaped arc-shaped slider is movably arranged in the annular groove track, a radial top screw hole is arranged on the I-shaped arc-shaped slider, and 16 I-shaped arc-shaped sliders are movably arranged in the annular groove track; Step 6: Sleeve the first set of shaped outer rings made in step 5 onto the outside of the end winding, connect the radial top screws in the radial top screw holes, and screw the side top screws in the side top screw screw holes; Step 7. Rotate each radial top screw to make the inner end of the radial top screw contact with the arc shaping plate to achieve the shaping of the outer arc of the end winding. At the same time, rotate the side top screw to make the inner end of the side top screw contact with the annular rubber shaping pressure plate to achieve the shaping of the side surface of the end winding end.
[0008] The present invention overcomes the defect that the coil ends of a large-span two-pole rotor rotating at high speed are easily loosened and deformed after being embedded in the rear end, ensures the standardization of the winding end size, improves the concentricity of the winding end, and provides convenient conditions for the smooth installation of the subsequent steel guard ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a transverse cross-sectional view of the present invention; Figure 3 is a transverse partial cross-sectional view of the present invention; Figure 4It is a diagram showing the matching relationship between the inner upper and lower arc-shaped pads and the end winding 2 of the present invention; Figure 5 It is a schematic diagram of the structure of the annular support plate 8 provided on the shaft end 1 of the motor shaft of the present invention; Figure 6 1 is a diagram showing the matching relationship between the arc-shaped shaping plate 5 and the annular supporting plate 8 of the present invention; Figure 7 It is a schematic diagram of the structure of the plastic outer ring of the present invention; Figure 8 It is a schematic structural diagram of the I-shaped arc-shaped sliding block 14 of the present invention. DETAILED DESCRIPTION
[0010] The present invention is described in detail below in conjunction with the accompanying drawings: A two-pole three-phase brushless synchronous generator rotor excitation coil end shaping tool, comprising a motor shaft end 1 and an end winding 2 of the excitation coil, an annular step 18 is arranged on the outer side elevation of the rotor core outside the end winding 2, and since the end winding 2 is cantilevered and arranged on the outer side of the motor core, an annular gap 19 exists between the motor shaft end 1 and the inner side of the end winding 2; an annular support plate 8 is sleeved on the motor shaft end 1 on the right side of the end winding 2, and a gap 19 is formed between the annular step 18 and the annular support plate 8. The plates 8 are spliced with arc-shaped shaping plates 5, the inner arc surface of the arc-shaped shaping plates 5 is pressed on the end winding 2, a left arc step 6 is provided on the inner arc surface of the left end of the arc-shaped shaping plates 5, and a right arc step 7 is provided on the inner arc surface of the right end of the arc-shaped shaping plates 5. The left arc step 6 is movably matched with the annular step 18, and the right arc step 7 is movably matched with the annular support plate 8; the eight arc-shaped shaping plates 5 are spliced into a shaping ring, and the glass fiber reinforced plastic prefabricated ring is sleeved on the shaping ring after shaping. Ring, to achieve the positioning of the end winding 2, so that it is on the same circumference, improve the dynamic balance of the motor rotor; the first positioning ring 12 and the second positioning ring 13 are movably sleeved on the outside of the shaping ring, the diameter of the first positioning ring 12 and the diameter of the second positioning ring 13 are larger than the diameter of the shaping ring formed by splicing eight arc-shaped shaping plates 5, so that the two positioning rings are suspended outside the shaping ring, the first positioning ring 12 and the second positioning ring 13 are arranged parallel to each other, and are connected by rings arranged at equal intervals of arc The pin shaft 16 is connected as a whole, and an annular groove track is arranged between the first positioning ring 12 and the second positioning ring 13. An I-shaped arc-shaped slider 14 is movably arranged in the annular groove track, and a radial top screw screw hole 17 is arranged on the I-shaped arc-shaped slider 14. A radial top screw 15 is screwed in the radial top screw screw hole 17, and the inner side end of the radial top screw 15 is top-connected to the outer side surface of the arc-shaped shaping plate 5. By rotating the radial top screw 15, the inner side end of the radial top screw 15 is top-connected to the arc-shaped shaping plate 5 to shape it.
[0011] An inner upper arc pad 3 and an inner lower arc pad 4 are respectively arranged in the annular gap 19, each inner upper arc pad 3 is spliced into a circular ring, each inner lower arc pad 4 is spliced into a circular ring, the size of the inner lower arc pad 4 is larger than the inner upper arc pad 3, so as to facilitate the assembly and disassembly of the upper and lower arc pads, and the circular ring spliced by the inner upper arc pads 3 serves the purpose of supporting the inner circle of the end winding 2, so that the inner circle of the end winding 2 is on the same circumference, so as to improve the dynamic balance of the motor rotor; a second group of shaping outer rings composed of a third positioning ring 19 and a fourth positioning ring 20 are arranged in parallel on the outer side of the end winding 2, and the structure of the second group of shaping outer rings is exactly the same as the structure of the first group of shaping outer rings composed of the first positioning ring 12 and the second positioning ring 13; the two parallel shaping outer rings can shape and position the eight arc shaping plates 5 at the same time, thereby improving the shaping work efficiency.
[0012] An annular rubber shaping plate 9 is arranged on the right side vertical surface of the end winding 2, and side top screw threading holes 10 are arranged at equal intervals on the same circumference of the annular support plate 8. A side top screw 11 is screwed in the side top screw threading hole 10, and the inner end of the side top screw 11 is connected to the right side vertical surface of the annular rubber shaping plate 9; when the end winding 2 is shaped on site, the radial top screw 15 and the side top screw 11 can be rotated synchronously, and the two can cooperate to shape the end winding 2 to an ideal state.
[0013] A method for shaping the end of a rotor excitation coil of a two-pole three-phase brushless synchronous generator comprises a motor shaft end 1 and an end winding 2 of the excitation coil, an annular step 18 is provided on the outer side elevation of the rotor core outside the end winding 2, and an annular gap 19 is provided between the motor shaft end 1 and the inner side surface of the end winding 2; the insulation wrapping method comprises the following steps: The first step is to arrange an inner upper arc pad 3 and an inner lower arc pad 4 in the annular gap 19, wherein the inner upper arc pads 3 are spliced into a circular ring, and the inner lower arc pads 4 are spliced into a circular ring, and the two circular rings support and position the inner side surface of the end winding 2; Step 2: Take the annular rubber shaping plate 9 and sleeve it on the motor shaft end 1, and make the annular rubber shaping plate 9 close to the right side of the end winding 2; The third step is to manufacture an annular support plate 8 and eight arc-shaped shaping plates 5 respectively, so that the diameter of the annular support plate 8 is equal to the diameter of the annular step 18, and side top screw holes 10 are arranged at equal intervals on the same circumference of the annular support plate 8; a left arc-shaped step 6 is arranged on the inner arc surface of the left end of the arc-shaped shaping plate 5, and a right arc-shaped step 7 is arranged on the inner arc surface of the right end of the arc-shaped shaping plate 5, so that the eight arc-shaped shaping plates 5 are spliced into a circular ring; The fourth step is to sleeve the annular support plate 8 onto the motor shaft end 1, and arrange the arc shaping plate 5 between the annular step 18 and the annular support plate 8; Step 5: Make a first positioning ring 12 and a second positioning ring 13 whose diameters are larger than the diameters of the motor rotor, set the first positioning ring 12 and the second positioning ring 13 parallel to each other, and connect them into a whole through a ring connecting pin 16 set at equal intervals of arc, an annular groove track is set between the first positioning ring 12 and the second positioning ring 13, an I-shaped arc-shaped slider 14 is movably set in the annular groove track, a radial top screw hole 17 is set on the I-shaped arc-shaped slider 14, and 16 I-shaped arc-shaped sliders 14 are movably set in the annular groove track; Step 6: Sleeve the first set of shaped outer rings made in step 5 onto the outside of the end winding 2, connect the radial top screw 15 into the radial top screw hole 17, and screw the side top screw 11 into the side top screw screw hole 10; The seventh step is to rotate each radial top screw 15 so that the inner end of the radial top screw 15 is in contact with the arc shaping plate 5 to achieve the shaping of the outer arc of the end winding 2. At the same time, the side top screw 11 is rotated so that the inner end of the side top screw 11 is in contact with the annular rubber shaping plate 9 to achieve the shaping of the side surface of the end winding 2.
[0014] A second group of shaping outer rings consisting of a third positioning ring 19 and a fourth positioning ring 20 are arranged in parallel on the outside of the end winding 2. The structure of the second group of shaping outer rings is exactly the same as the structure of the first group of shaping outer rings consisting of the first positioning ring 12 and the second positioning ring 13. The outer arc of the end winding 2 can be shaped synchronously by rotating the radial top screws on the second group of shaping outer rings.
Claims
1. A method for shaping the end of a rotor excitation coil of a two-pole three-phase brushless synchronous generator, comprising a motor shaft end (1) and an end winding (2) of the excitation coil, an annular step (18) being provided on the outer side elevation of the rotor core outside the end winding (2), and an annular gap (19) being provided between the motor shaft end (1) and the inner side surface of the end winding (2); the insulating wrapping method comprising the following steps: The first step is to arrange an inner upper arc-shaped pad (3) and an inner lower arc-shaped pad (4) in the annular gap (19), wherein the inner upper arc-shaped pads (3) are spliced into a circular ring, and the inner lower arc-shaped pads (4) are spliced into a circular ring, and the two circular rings support and position the inner side surface of the end winding (2); Step 2: Take the annular rubber shaping pressing plate (9) and sleeve it on the shaft end (1) of the motor shaft, and make the annular rubber shaping pressing plate (9) and the right side vertical surface of the end winding (2) close together; The third step is to manufacture an annular support plate (8) and eight arc-shaped shaping plates (5) respectively, so that the diameter of the annular support plate (8) is equal to the diameter of the annular step (18), and side top screw holes (10) are arranged at equal intervals on the same circumference of the annular support plate (8); a left arc-shaped step (6) is arranged on the inner arc surface of the left end of the arc-shaped shaping plate (5), and a right arc-shaped step (7) is arranged on the inner arc surface of the right end of the arc-shaped shaping plate (5), so that the eight arc-shaped shaping plates (5) are spliced into a circular ring; The fourth step is to sleeve the annular support plate (8) onto the shaft end (1) of the motor shaft, and to arrange the arc-shaped shaping plate (5) between the annular step (18) and the annular support plate (8); Step 5: manufacturing a first positioning ring (12) and a second positioning ring (13) having a diameter greater than that of the motor rotor, arranging the first positioning ring (12) and the second positioning ring (13) parallel to each other, and connecting them into a whole through ring connecting pins (16) arranged at equal intervals of arc, providing an annular groove track between the first positioning ring (12) and the second positioning ring (13), movably providing an I-shaped arc-shaped slider (14) in the annular groove track, providing a radial top screw hole (17) on the I-shaped arc-shaped slider (14), and movably providing 16 I-shaped arc-shaped sliders (14) in the annular groove track; Step 6: Sleeve the first set of shaped outer rings produced in step 5 onto the outside of the end winding (2), connect the radial top screw (15) to the radial top screw hole (17), and screw the side top screw (11) into the side top screw screw hole (10); Step 7: By rotating each radial top screw (15), the inner end of the radial top screw (15) is brought into contact with the arc shaping plate (5), thereby shaping the outer arc of the end winding (2). At the same time, by rotating the side top screw (11), the inner end of the side top screw (11) is brought into contact with the annular rubber shaping plate (9), thereby shaping the side surface of the end winding (2).
2. The method for shaping the end of the rotor excitation coil of a two-pole three-phase brushless synchronous generator according to claim 1, characterized in that: A second group of shaping outer rings consisting of a third positioning ring (19) and a fourth positioning ring (20) are arranged in parallel on the outer side of the end winding (2); the structure of the second group of shaping outer rings is completely identical to the structure of the first group of shaping outer rings consisting of a first positioning ring (12) and a second positioning ring (13); and the shaping of the outer arc of the end winding (2) can be synchronously achieved by rotating the radial top screws on the second group of shaping outer rings at the same time.