CN214900382U - 4500-supple high-power brushless synchronous generator who moves with an elevation of 5000 meters - Google Patents
4500-supple high-power brushless synchronous generator who moves with an elevation of 5000 meters Download PDFInfo
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- CN214900382U CN214900382U CN202121562123.6U CN202121562123U CN214900382U CN 214900382 U CN214900382 U CN 214900382U CN 202121562123 U CN202121562123 U CN 202121562123U CN 214900382 U CN214900382 U CN 214900382U
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Abstract
The utility model discloses a high-voltage high-power brushless synchronous generator operating at the altitude of 4500-; the rotor magnetic pole and the stator slot are internally provided with a rotor winding and a stator winding respectively in a penetrating way, and the rotor winding and the stator winding are arranged without gaps with the inner side walls of the rotor magnetic pole and the stator slot respectively; an asymmetric damping cage structure is arranged on the rotor; the utility model discloses a high-power brushless synchronous generator of high pressure sets up to the straight flute through the tooth's socket with on stator and the rotor, reduces the production technology requirement and the assembly requirement of generator stator and rotor, improves the generator quality, simultaneously, through setting up asymmetric damping cage structure on the rotor, when the generator is incorporated into the power networks, produces asymmetric harmonic in the asymmetric damping cage structure, weakens and weakens 5 and 7 harmonic influences, obtains high-quality electric energy.
Description
Technical Field
The utility model belongs to the generator field, more specifically the high-power brushless synchronous generator of high pressure that 4500 supplyes medicine 5000 meters elevation of land above sea operation that says so.
Background
In the prior art, the stator and rotor skewed slot method is the most commonly used as a harmonic suppression means of a synchronous generator. The stator and rotor tooth grooves of the generator are arranged into the skewed slots, namely, the tooth grooves on each stator and rotor punching sheet are overlapped to form an inclined winding tooth groove, gaps are reserved between the winding tooth grooves and the windings, and the stator and rotor structure weakening high-order electromagnetic harmonics has high requirements on the production process and the installation work of the stator and rotor punching sheets, and is complex in processing process, low in yield and high in production cost. Particularly for high-power generators, the processing requirements and the assembly requirements on the stator and the rotor are higher.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a 4500 increase high-power brushless synchronous generator of high pressure of 5000 meters elevation operations through setting up the tooth's socket on stator and the rotor into the straight flute, reduces the production technology requirement and the assembly requirement of generator stator and rotor, improves the generator quality, simultaneously, through set up asymmetric damping cage structure on the rotor, when the generator is incorporated into the power networks, produces asymmetric harmonic in the asymmetric damping cage structure, weakens 5, 7 harmonic influences, obtains high-quality electric energy.
The utility model discloses technical scheme one kind is at 4500 plus 5000 meters high-pressure high-power brushless synchronous generator of height above sea level operation, including stator and rotor, the rotor includes rotor core, rotor magnetic pole and asymmetric damping cage structure, the stator includes stator core and the stator slot of equipartition setting on stator core, stator slot and the interpolar rotor core slot of two adjacent rotor magnetic poles are the straight flute; and the rotor winding and the stator winding are respectively wound and embedded on the rotor magnetic pole and in the stator slot, and are respectively arranged without gaps with the inner side walls of the rotor magnetic pole and the stator slot.
Preferably, the asymmetric damping cage structure comprises two damping rings respectively arranged at two ends of the rotor and a plurality of damping guide bars which penetrate through magnetic poles of the rotor and are electrically connected with the two damping rings; the rotor magnetic poles are provided with a plurality of rotor damping straight grooves with central axes parallel to the axis of the rotor core, the rotor damping straight grooves on adjacent rotor magnetic poles are symmetrically arranged, and the rotor damping straight grooves on the same rotor magnetic pole are arranged in an interval asymmetrical mode.
Preferably, the radius of the distributed circles of all the rotor damping straight slots is equal, the pitch of the rotor damping straight slots with at least two sizes is arranged on the same rotor magnetic pole, and the rotor damping straight slots on the same rotor magnetic pole are arranged in an asymmetric manner by the central line of the rotor magnetic pole.
Preferably, the pitch of the rotor damping straight slots in the middle of the same rotor magnetic pole is larger than that of the rotor damping straight slots on the outer side, and the rotor damping straight slots on the two sides of the center line of the rotor magnetic pole are asymmetrically arranged by the center line of the rotor magnetic pole.
Preferably, the damping rings and the rotor are arranged in an equal diameter mode, mounting holes for mounting the damping guide bars are formed in the two damping rings, and the positions of the mounting holes are matched with the rotor damping straight grooves in the rotor.
Preferably, the stator winding is in including stator electromagnetic wire and parcel the outside high-pressure corona prevention structure of stator electromagnetic wire, the stator electromagnetic wire is including arranging the inside section in the stator iron core in and arranging the outside section at stator iron core both ends in, the high-pressure corona prevention structure is including wrapping up inside section insulating layer and outside section insulating layer on inside section and outside section respectively, the overlap joint forms insulating layer in turn between inside section insulating layer and the outside section insulating layer, the stator electromagnetic wire includes naked copper flat wire, the outside of naked copper flat wire is wrapped gradually along its radially has autohension imine film and mica tape for the cable.
Preferably, the inner section insulating layer is formed by half-lap wrapping of a low-resistance anti-corona band, the outer section insulating layer is formed by half-lap wrapping of a medium-resistance anti-corona band and a high-resistance anti-corona band in sequence, the alternating insulating layers are formed by half-lap wrapping of a low-resistance anti-corona band, a medium-resistance anti-corona band and a high-resistance anti-corona band in sequence, and the lap joint distance between the inner section insulating layer and the outer section insulating layer is not less than 20 cm.
Preferably, the outer section insulating layer overlaps the inner section insulating layer in a linear state on the outer section.
Preferably, the low-resistance corona-proof belt of the inner-section insulating layer is wrapped by at least one layer, and the medium-resistance corona-proof belt and the high-resistance corona-proof belt of the outer-section insulating layer are wrapped by at least one layer respectively.
The utility model discloses technical scheme's a high-power brushless synchronous generator of high pressure at 4500 + 5000 meters elevation operation's beneficial effect is:
1. the method for eliminating the harmonic waves by adopting the skewed slot structure of the stator or the rotor of the generator in the prior art is changed, and the stator and the rotor of the straight slot are changed, so that the processing difficulty and the assembly difficulty of the stator and the rotor of the generator are reduced, and the quality of the generator is improved. The stator and the rotor adopt straight slots, so that the gap between the stator slot or the rotor magnetic pole and the high-voltage coil is effectively eliminated, and the processing technology and the manufacturing quality are improved.
2. The damping structure of the generator adopts an asymmetric damping cage structure, thereby weakening the influence of 5, 7 and 9 harmonics, and reducing the waveform distortion rate of voltage and the electromagnetic noise generated by the harmonics.
Drawings
FIG. 1 is a schematic cross-sectional view of a high-voltage high-power brushless synchronous generator operating at an altitude of 4500-,
figure 2 is a schematic longitudinal section of an asymmetric damping cage structure,
figure 3 shows an embodiment of a rotor damping straight slot on a rotor,
fig. 4 is a schematic diagram of a high-voltage corona-proof structure on a stator.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention by those skilled in the art, the technical solutions of the present invention will now be further described with reference to the drawings attached to the specification.
As shown in fig. 1 and fig. 2, the utility model discloses technical scheme a high-pressure high-power brushless synchronous generator who runs at 4500-. The rotor 1 comprises a rotor core 11, a rotor magnetic pole 12 and an asymmetric damping cage structure 3. The stator comprises a stator core 21 and stator slots 22 uniformly distributed on the stator core 21. The stator slot 22 and the rotor core slot 13 between two adjacent rotor poles 12 are straight slots.
The utility model discloses among the technical scheme, change among the prior art the means that stator or rotor adopt the chute to reduce the harmonic in the generator, be provided with asymmetric damping cage structure 3 on the rotor instead and realize reducing the harmonic. Therefore, the stator slots 22 and the rotor core slots 13 can be set to be straight slots, the processing technology requirements and difficulty and the installation technology requirements and difficulty of the stator and the rotor are greatly reduced, and the processing technology and the manufacturing quality of the high-power generator are improved.
In the technical scheme, a rotor winding and a stator winding are respectively wound and embedded on the rotor magnetic pole 12 and in the stator slot 22, and the rotor winding and the stator winding are respectively arranged without gaps with the inner side walls of the rotor magnetic pole 12 and the stator slot 22. The technical scheme is adopted, the gap between the stator slot 22 or the rotor and the high-voltage coil is eliminated, and the stator slot 22, the rotor magnetic pole 12 and the high-voltage coil are in gapless fit, so that the probability of voltage difference and a corona layer of a product in the high-altitude environment of 4500 plus 5000m is reduced, the reliability of high-quality insulation of a high-voltage stator coil winding is ensured, the voltage difference of the product is effectively avoided, the corona layer is generated, and the high-reliability insulation of the high-voltage coil is ensured.
In order to further avoid corona generation of the high-voltage generator during working, a stator winding of the generator is set to be of a high-voltage insulation structure, so that long-term continuous operation at the altitude of less than 5000m is ensured, and no corona discharge is generated in a high-voltage coil. As shown in fig. 4, the stator winding includes stator magnet wires 24 and a high-voltage corona-proof structure wrapped around the stator magnet wires 24.
As shown in fig. 4, the stator magnet wire 24 includes a bare copper flat wire 240, and a self-adhesive imine film 241 and a mica tape 242 for cable are sequentially wrapped around the outside of the bare copper flat wire 240 along a radial direction thereof. Compared with the traditional stator electromagnetic wire which only adopts bare copper wires, the insulating capability of the stator electromagnetic wire 24 at high altitude is effectively improved, and the probability of corona occurrence is greatly reduced.
In this technical solution, the stator electromagnetic wire 24 includes an inner section disposed in the stator core 21 and outer sections disposed at two ends of the stator core. The high voltage corona resistant structure includes an inner section insulating layer and an outer section insulating layer wrapped over the inner section and the outer section, respectively. The inner section insulating layers and the outer section insulating layers are overlapped to form alternate insulating layers.
The inner section insulation layer is formed by half-lap wrapping of a low-resistance corona-proof belt 25, and the outer section insulation layer is formed by half-lap wrapping of a medium-resistance corona-proof belt 26 and a high-resistance corona-proof belt 27 in sequence. The alternating insulating layers are formed by half-lap wrapping in sequence of low resistance corona-preventing tape 25, medium resistance corona-preventing tape 26 and high resistance corona-preventing tape 27. The lapping distance between the inner section insulating layer and the outer section insulating layer is not less than 20cm, and the optimal lapping length is 20mm-25 mm.
The outer section insulating layer is on the outer section and is in lap joint with the inner section insulating layer in a linear state. The low-resistance corona-proof belt 25 of the inner-section insulating layer is wrapped by at least one layer, and the middle-resistance corona-proof belt 26 and the high-resistance corona-proof belt 27 of the outer-section insulating layer are wrapped by at least one layer respectively.
The low resistance corona preventing tape 25, the medium resistance corona preventing tape 26 and the high resistance corona preventing tape 27 adopt a specification of 0.20mm × 25mm (thickness × width).
The technical scheme of the high-voltage corona-proof structure can realize that the stator coil does not generate corona on the surface of the coil under the voltage withstanding of 27000V when the altitude is 4500M, and does not generate corona on the surface of the coil under the voltage withstanding of 30000V when the altitude is 5000M. Namely, the utility model discloses technical scheme's generator can be exclusively used in 4500- +55 ℃ high altitude area, ambient temperature minus 40 ℃, high-power electricity generation of high pressure 10000V.
In order to further improve the corona prevention capability, ensure the stability of the high-voltage corona prevention structure and prolong the service life of the high-voltage corona prevention structure, a ventilating belt is wrapped outside the outer section insulating layer, and the ventilating belt adopts the specification of 0.09mm multiplied by 25 mm.
In order to further improve the corona prevention capability, after the winding of the internal section insulating layer, the external section insulating layer, the alternating insulating layer and the permeable belt is finished, the stator winding cable (before the embedding winding in the stator iron core) is subjected to a voltage withstand test, then is completely dipped into H-level insulating resin once according to the process convention VPI, after the drying treatment, the surface of the stator winding cable is subjected to less-glue vacuum pressure dipping paint treatment, and the insulation structure is subjected to less-glue vacuum pressure dipping paint treatment, so that the integrity of the high-voltage stator coil winding is good, the insulation quality is stable, and meanwhile, the stator iron core groove and the high-voltage coil are in gapless fit, thereby reducing the probability that a product has a voltage difference and a corona layer in the 4500-high altitude environment, and ensuring the reliability of high-quality insulation of the high-voltage stator coil winding.
The high-voltage corona-proof structure is based on a measuring method and an evaluation guide rule of partial discharge of a stator bar and a winding of a rotary motor in GB/T20833-2007; GB/T22715-2008/IEC 60034-15:1995 alternating current motor stator forming coil impact-resistant voltage level; the discharge cloud insulation structure of the stator coil winding of the high-voltage motor is tested according to the standards such as the technical conditions of the stator coil of the JB/T12685-2016 high-voltage motor, and the like, and the test results are within the standard qualified range.
As shown in fig. 1 to 3, in the present embodiment, an asymmetric damping cage structure 3 is provided on the rotor 1. As shown in fig. 2, the asymmetric damping cage structure 3 includes two damping rings 31 respectively disposed at two ends of the rotor 1, and a plurality of damping bars 32 passing through the rotor magnetic poles 12 and electrically connected to the two damping rings 31. The rotor magnetic poles 12 are provided with a plurality of rotor damping straight grooves 33 with central axes parallel to the axis of the rotor iron core 11, and the rotor damping straight grooves 33 on the adjacent rotor magnetic poles 12 are symmetrically arranged. The rotor damping straight slots 33 on the same rotor magnetic pole 12 are arranged in an asymmetrical pitch.
The asymmetric damping cage structure is a damping winding, and the damping winding mainly passes through a damping conducting bar 32 of the rotor 1 and damping rings 31 electrically welded at two ends of the damping conducting bar 32. When the generator is connected to the grid, the stator magnetic field and the rotor magnetic field move relatively, induction current is generated in the damping winding, and electromagnetic torque generated by the induction current in the damping winding plays a role in damping the rotor, namely the rotor can be inhibited from rotating speed oscillation. According to the asymmetric damping cage structure in the technical scheme, the asymmetric arrangement of the damping winding is realized through the asymmetric arrangement of the rotor damping straight slots 33 on the rotor 1, so that asymmetric harmonics are generated in the damping winding, the amplitude of current harmonics in the damping winding is effectively inhibited, the influences of 3-order, 5-order and 7-order harmonics are weakened, the distortion rate of a voltage waveform is reduced, high-quality electric energy is obtained, and electromagnetic noise generated by the harmonics is weakened.
In the technical solution, as shown in fig. 1, the radii of the distributed circles of all the rotor damping straight slots 33 are equal, the rotor damping straight slot pitches of at least two sizes are provided on the same rotor magnetic pole 12, and the rotor damping straight slots on the same rotor magnetic pole are asymmetrically arranged with the central line 10 of the rotor magnetic pole. As shown in fig. 3, the pitch of the rotor damping straight slots in the middle of the same rotor magnetic pole 12 is greater than that of the rotor damping straight slots on the outer side, and the rotor damping straight slots on both sides of the center line of the rotor magnetic pole are asymmetrically arranged with the center line of the rotor magnetic pole.
The radius of the rotor damping straight slot distribution circle, the diameters of the rotor damping straight slots and the damping guide bars 32 and the pitch of the rotor damping straight slots are designed according to the design standard of the generator. Through the selection and checking calculation of the number of the rotor damping straight slots and the pitch of the rotor damping straight slots, the harmonic flux density amplitude generated in the damping cage is very small under the condition that the pitch of the rotor damping straight slots is selected to be adaptive (approximately equal) to the pitch of the stator teeth, so that the harmonic potential is extremely small, the potential waveform is good, and the additional loss of the damping winding can be reduced.
As shown in fig. 3, a specific embodiment of the arrangement of the damping straight slots and the damping conducting bars 32 of the rotor is provided, in this embodiment, six damping straight slots are provided on the same rotor magnetic pole 12, and three damping straight slots are provided on two sides of the center line of the rotor magnetic pole. The rotor damping straight slots on two sides of the rotor magnetic pole center line are asymmetrically arranged with the rotor magnetic pole center line. The distances between the rotor damping straight grooves on the two sides of the rotor magnetic pole and the center line of the rotor magnetic pole are respectively 10mm and 15mm, the pitch of the rotor damping straight grooves on the two sides of the center line of the rotor magnetic pole is 25mm, and the pitch of the other rotor damping straight grooves is 20 mm.
The damping rings 31 and the rotor 1 are arranged in an equal diameter mode, mounting holes used for mounting the damping guide strips 32 are formed in the damping rings 31, and the positions of the mounting holes are matched with the rotor damping straight grooves 33.
The application of the asymmetric damping cage structure in the technical scheme greatly weakens 3-order, 5-order, 7-order and 9-order harmonic images and effectively reduces the voltage waveform distortion rate to the voltage waveform distortion rate THD which is less than or equal to 2.5 percent. Through the test, the voltage waveform distortion rate THD is less than or equal to 2.08 percent (the GB and IEC standard requires that THD is less than or equal to 5 percent), the high-quality electric energy requirement is fully met, and therefore the application of high-precision load equipment is precisely controlled. The electromagnetic noise generated by the harmonics is also effectively attenuated, and the noise measured by the generator is 107dB (110 dB according to the national standard).
By adopting the asymmetric damping cage structure of the technical scheme, damping harmonic attenuation is realized, and the purpose of realizing harmonic suppression in a stator and rotor chute mode in the prior art is achieved. In the synchronous generator, the asymmetric damping cage structure is adopted, namely, a stator or rotor chute structure is not required, so that the production process and the installation process of the stator and the rotor are simplified, the production cost of the generator is reduced, and the quality is improved.
The technical solution of the present invention is to provide an improved method for manufacturing a semiconductor device, which is characterized in that the method is not limited by the above-mentioned method, and the method is not substantially improved by the method and the device, or the method and the device are directly applied to other occasions without improvement, all within the protection scope of the present invention.
Claims (9)
1. A high-voltage high-power brushless synchronous generator operating at an altitude of 4500-5000 meters is characterized by comprising a stator and a rotor, wherein the rotor comprises a rotor core, rotor magnetic poles and an asymmetric damping cage structure; the rotor magnetic pole and the stator slot are respectively wound and embedded with a rotor winding and a stator winding, and the rotor winding and the stator winding are respectively arranged without gaps with the inner side walls of the rotor magnetic pole and the stator slot.
2. The high-voltage high-power brushless synchronous generator capable of operating at the altitude of 4500-5000 meters as claimed in claim 1, wherein the asymmetric damping cage structure comprises two damping rings respectively disposed at two ends of the rotor and a plurality of damping conducting bars passing through the rotor magnetic poles and electrically connected to the two damping rings; the rotor magnetic poles are provided with a plurality of rotor damping straight grooves with central axes parallel to the axis of the rotor core, the rotor damping straight grooves on adjacent rotor magnetic poles are symmetrically arranged, and the rotor damping straight grooves on the same rotor magnetic pole are arranged in an interval asymmetrical mode.
3. The high-voltage high-power brushless synchronous generator capable of operating at an altitude of 4500-5000 meters as claimed in claim 2, wherein the radii of the distributed circles of all the rotor damping straight slots are equal, the pitch of the rotor damping straight slots with at least two sizes on the same rotor magnetic pole is at least two different, and the rotor damping straight slots on the same rotor magnetic pole are asymmetrically arranged with the centerline of the rotor magnetic pole.
4. The high-voltage high-power brushless synchronous generator capable of operating at an altitude of 4500-5000 meters as claimed in claim 3, wherein the pitch of the rotor damping straight slots in the middle of the same rotor magnetic pole is greater than the pitch of the rotor damping straight slots on the outer side, and the rotor damping straight slots on both sides of the center line of the rotor magnetic pole are asymmetrically arranged with the center line of the rotor magnetic pole.
5. The high-voltage high-power brushless synchronous generator capable of operating at an altitude of 4500-5000 meters as claimed in claim 2, wherein the damping rings and the rotor are arranged in the same diameter, mounting holes for mounting the damping conducting bars are arranged on both the damping rings, and the positions of the mounting holes are adapted to the rotor damping straight grooves on the rotor.
6. The high-voltage high-power brushless synchronous generator capable of operating at an altitude of 4500-5000 meters as claimed in claim 1, wherein the stator winding comprises a stator electromagnetic wire and a high-voltage corona-proof structure wrapped outside the stator electromagnetic wire, the stator electromagnetic wire comprises an inner section arranged in a stator iron core and outer sections arranged at two ends of the stator iron core, the high-voltage corona-proof structure comprises an inner section insulating layer and an outer section insulating layer respectively wrapped on the inner section and the outer section, the inner section insulating layer and the outer section insulating layer are overlapped to form an alternating insulating layer, the stator electromagnetic wire comprises a bare copper flat wire, and a self-adhesive imine film and a mica tape for a cable are sequentially wrapped outside the bare copper flat wire along the radial direction of the bare copper flat wire.
7. The high-voltage high-power brushless synchronous generator capable of operating at an altitude of 4500-5000 meters as claimed in claim 6, wherein the inner-section insulating layer is formed by half-lap wrapping of low-resistance anti-corona belts, the outer-section insulating layer is formed by half-lap wrapping of medium-resistance anti-corona belts and high-resistance anti-corona belts in sequence, the alternating insulating layers are formed by half-lap wrapping of low-resistance anti-corona belts, medium-resistance anti-corona belts and high-resistance anti-corona belts in sequence, and the lap joint distance between the inner-section insulating layer and the outer-section insulating layer is not less than 20 cm.
8. The high-voltage high-power brushless synchronous generator capable of operating at altitude 4500-5000 meters as claimed in claim 7, wherein the outer section insulating layer is overlapped with the inner section insulating layer on the outer section in a linear state.
9. The high-voltage high-power brushless synchronous generator capable of operating at altitudes of 4500-5000m as claimed in claim 7, wherein the low-resistance corona-proof belt of the inner-section insulating layer is wrapped by at least one layer, and the middle-resistance corona-proof belt and the high-resistance corona-proof belt of the outer-section insulating layer are wrapped by at least one layer respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121562123.6U CN214900382U (en) | 2021-07-09 | 2021-07-09 | 4500-supple high-power brushless synchronous generator who moves with an elevation of 5000 meters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121562123.6U CN214900382U (en) | 2021-07-09 | 2021-07-09 | 4500-supple high-power brushless synchronous generator who moves with an elevation of 5000 meters |
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| Publication Number | Publication Date |
|---|---|
| CN214900382U true CN214900382U (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121562123.6U Active CN214900382U (en) | 2021-07-09 | 2021-07-09 | 4500-supple high-power brushless synchronous generator who moves with an elevation of 5000 meters |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114189082A (en) * | 2021-11-29 | 2022-03-15 | 南方电网调峰调频发电有限公司检修试验分公司 | Corona discharge suppression method and structure of generator stator bar and generator |
-
2021
- 2021-07-09 CN CN202121562123.6U patent/CN214900382U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114189082A (en) * | 2021-11-29 | 2022-03-15 | 南方电网调峰调频发电有限公司检修试验分公司 | Corona discharge suppression method and structure of generator stator bar and generator |
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