CN102780339B - Monitoring method for motor stator vacuum pressure full-impregnation process - Google Patents
Monitoring method for motor stator vacuum pressure full-impregnation process Download PDFInfo
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- CN102780339B CN102780339B CN 201210281393 CN201210281393A CN102780339B CN 102780339 B CN102780339 B CN 102780339B CN 201210281393 CN201210281393 CN 201210281393 CN 201210281393 A CN201210281393 A CN 201210281393A CN 102780339 B CN102780339 B CN 102780339B
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Abstract
The invention discloses a monitoring method for a motor stator vacuum pressure full-impregnation process, which can ensure a stator winding to be sufficiently impregnated. The monitoring method comprises the following steps of: firstly, connecting a capacitance measurement device on a stator; sequentially acquiring an electrostatic capacity Co of the stator winding before the stator winding is dipped into paint, an increasing rate of the electrostatic capacity in the packing process, an electrostatic capacity Cs before the pressure is relieved and an electrostatic capacity Cf after the pressure is relieved to the normal pressure; then judging whether the electrostatic capacity of the stator winding reaches a saturation state, wherein in the saturation state, the electrostatic capacity needs to meet any one of the following conditions that: a, a value of Cs/C0 is calculated, the pressure is relieved to the normal pressure if the value of Cs/C0 is greater than a constant and holdup time needs to be prolonged by 1 to 3 hours if the value of Cs/C0 is less than or equal to the constant; and b, the pressure can be relieved to the normal pressure if delta C is equal to 0, the electrostatic capacity of the stator winding is judged in the saturation state if delta C is unequal to 0, is linearly increased and is less than 0.5 percent, or the holdup time needs to be prolonged by 1 to 3 hours; and finally, calculating a value of (1-Cf/Cs)*100% and pumping back paint liquid if the value of (1-Cf/Cs)*100% is less than 0.5 percent.
Description
Technical field
The present invention relates to the method for supervising of the whole soaking technology of a kind of motor stator vacuum pressure.
Background technology
The stator of motor after the whole soaking technology of vacuum pressure (VPI) is processed, good insulation preformance, temperature rise reduces, raise the efficiency, increase mechanical strength, solve the loosening phenomenon of winding at running, prevent the insulation faults such as short circuit in winding, improve moistureproof ability, increase the service life.Motor stator VPI technique is by vacuumizing, the air exhausting of bar insulation interlayer to be removed in special container, with high pressure, solvent-free immersion paint liquid is injected to insulating barrier, then is placed in mould and makes to insulate into as a whole through the high temperature baked and cured.Whether motor stator VPI the most important thing is in insulating barrier, paint liquid and fully soak into.If paint, liquid is insufficient to be soaked into, after the insulation baked and cured, and the inner air gap that easily occurs of insulating barrier, thereby the generation electric discharge phenomena, affect the electrical machine insulation life-span, makes motor on-stream, bring the danger of insulation breakdown, directly affect the performance and used life of motor.Therefore, judging whether electrical machine insulation is whole soaks into, and is that electrical machine insulation is processed very crucial operation.Conventional motors stator VPI technique is just controlled technological parameter (vacuum degree, pressure, pressing time etc.), and to whether soaking into the monitoring of having no idea after stator VPI.
Summary of the invention
The method for supervising that the purpose of this invention is to provide the whole soaking technology of a kind of motor stator vacuum pressure, it can guarantee that motor stator fully soaks into stator winding in the whole soaking technology process of vacuum pressure, and the insulation processing of motor is had to extremely important effect.
The technical scheme that realizes above-mentioned purpose is: the method for supervising of the whole soaking technology of a kind of motor stator vacuum pressure comprises the following steps:
Step 1, first be placed on stator in impregnating vessel, then capacitance measuring device is connected on stator, then vacuumizes;
Step 3 after the paint immersion there is not motor stator, is pressurizeed and pressurize within the time period of setting, and per hour measures the static capacity of a stator winding in pressure maintaining period;
Step 4, pressurize is first calculated the static capacity of stator winding increment rate Δ hourly C in pressure maintaining period, then is measured the static capacity Cs of stator winding before pressure relief after finishing, and then calculates Cs/C0;
Step 5, the static capacity that the judges stator winding state that whether reaches capacity, any one condition in must meet the following conditions a and condition b:
If Cs/C0>constant a., the static capacity that the draws stator winding state that reaches capacity, but pressure relief to normal pressure, if Cs/C0≤constant, the static capacity that the draws stator winding state that do not reach capacity, need to extend 1～3 hour dwell time;
If Δ C=0 b., the static capacity that the draws stator winding state that reaches capacity, but pressure relief is to normal pressure, if Δ C ≠ 0, but increase with linearity, and Δ C<0.5%, the static capacity that the draws stator winding state that reaches capacity, otherwise, extend 1～3 hour dwell time, and per hour measure the static capacity of a stator winding in the dwell time section extended, then recalculate Δ C, until satisfy condition;
Step 6, pressure relief, to normal pressure, is first measured the static capacity Cf of stator winding, then calculates (1-Cf/Cs) * 100%, if<0.5%, but pumpback paint liquid.
The method for supervising of the above-mentioned whole soaking technology of motor stator vacuum pressure, wherein, while carrying out described step 1, described stator is to be placed in the inner bag of described impregnating vessel, and also is provided with insulation board between the bottom of described stator and described inner bag.
The method for supervising of the above-mentioned whole soaking technology of motor stator vacuum pressure, wherein, while carrying out described step 1, it is that a utmost point measurement cable is connected with the lead-in wire of described stator winding that described capacitance measuring device connects with described stator connected mode, and another utmost point is measured cable and is connected with iron core or the support of described stator.
The method for supervising of the whole soaking technology of motor stator vacuum pressure of the present invention, employing is soaked (being VPI) process at stator vacuum pressure is whole, size and the rate of change of the static capacity by measuring stator winding judge whether stator winding fully soaks into, thereby can guarantee that motor stator fully soaks into stator winding in the whole soaking technology process of vacuum pressure, insulation processing to motor has extremely important effect, to improving the quality of products, has very great help.
The accompanying drawing explanation
Fig. 1 is that motor stator is in the view of carrying out VPI;
The change curve that Fig. 2 is motor stator static capacity of stator winding in carrying out the VPI process.
Embodiment
In order to make those skilled in the art can understand better technical scheme of the present invention, below in conjunction with accompanying drawing, its embodiment is described in detail:
Refer to Fig. 1 and Fig. 2, the method for supervising of the whole soaking technology of a kind of motor stator vacuum pressure of the present invention comprises the following steps:
Step 1, first stator 1 be placed in the inner bag 21 of impregnating vessel 2 and between the bottom of stator 1 and inner bag 21, insulation board 22 be set, if there are a plurality of workpiece to be placed in inner bag 21 simultaneously, workpiece can not contact with the wall of inner bag 21, workpiece can not contact with workpiece, again the LCR capacitance measuring device is connected on stator 1, a utmost point on capacitance measuring device is measured cable 31 and is connected with the lead-in wire of stator winding, if workpiece has a plurality of lead-in wires, first with leaded the linking together of copper wire handle, again a utmost point being measured to cable is connected on copper wire, another utmost point is measured cable 32 and is connected with iron core or the support of stator, require tie point without insulants such as paint, guarantee ground connection, then in the time period T1 set, impregnating vessel 2 is vacuumized,
Step 3 after the paint immersion there is not motor stator 1, is pressurized to pressure the pressurize of setting in the time period T3 set, and per hour measures the static capacity C of a stator winding in pressure maintaining period;
Step 4, pressurize is first calculated the static capacity of stator winding increment rate Δ hourly C in pressure maintaining period, then is measured the static capacity Cs of stator winding before pressure relief after finishing, and then calculates Cs/C0;
Step 5, the static capacity that the judges stator winding state that whether reaches capacity, any one condition in must meet the following conditions a and condition b:
If Cs/C0>constant (this constant according to different motors are carried out to the test of dielectric loss and the data that partial discharge test draws) a., the static capacity that the draws stator winding state that reaches capacity, but pressure relief is to normal pressure, if Cs/C0≤constant, the static capacity that the draws stator winding state that do not reach capacity, need to extend 1～3 hour dwell time;
If Δ C=0 b., the static capacity that the draws stator winding state that reaches capacity, but pressure relief is to normal pressure, if Δ C ≠ 0, but increase and Δ C<0.5%, the static capacity that the draws stator winding state that reaches capacity with linearity, otherwise, extend 1～3 hour dwell time, and per hour measure the static capacity of a stator winding in the dwell time section extended, then recalculate Δ C, until satisfy condition, the static capacity of stator winding just reaches capacity;
Step 6, pressure relief, to normal pressure, is first measured the static capacity Cf of stator winding, then calculates (1-Cf/Cs) * 100%, if<0.5%, can be by the paint liquid pumpback in the inner bag of impregnating vessel 2 21.
Method for supervising of the present invention judges by size and the rate of change of the static capacity of measurement stator winding whether stator winding fully soaks into, thereby can guarantee that stator winding fully soaks into, insulation processing to motor has extremely important effect, to improving the quality of products, has very great help.This method for supervising can improve stator in vacuum pressure is whole in soaking (VPI) process quality control ability.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention is described, and not be used as limitation of the invention, as long as in connotation scope of the present invention, to variation, the modification of the above embodiment, all will drop in claims scope of the present invention.
Claims (1)
1. the method for supervising of the whole soaking technology of motor stator vacuum pressure, is characterized in that, comprises the following steps:
Step 1, first be placed on stator in impregnating vessel, then capacitance measuring device is connected on stator, then vacuumizes;
Step 2, after impregnating vessel reaches vacuum, first measure the static capacity Co of stator winding, and paint liquid reinjects;
Step 3 after the paint immersion there is not motor stator, is pressurizeed and pressurize within the time period of setting, and per hour measures the static capacity of a stator winding in pressure maintaining period;
Step 4, pressurize is first calculated the static capacity of stator winding increment rate △ C hourly in pressure maintaining period, then is measured the static capacity Cs of stator winding before pressure relief after finishing, and then calculates Cs/Co;
Step 5, the static capacity that the judges stator winding state that whether reaches capacity, any one condition in must meet the following conditions a and condition b:
If Cs/Co>constant a., the static capacity that the draws stator winding state that reaches capacity, but pressure relief to normal pressure, if Cs/Co≤constant, the static capacity that the draws stator winding state that do not reach capacity, need to extend 1～3 hour dwell time;
If △ C=0 b., the static capacity that the draws stator winding state that reaches capacity, but pressure relief is to normal pressure, if △ is C ≠ 0, but increase with linearity, and △ C<0.5%, the static capacity that the draws stator winding state that reaches capacity, otherwise, extend 1～3 hour dwell time, and per hour measure the static capacity of a stator winding in the dwell time section extended, then recalculate △ C, until satisfy condition;
Step 6, pressure relief, to normal pressure, is first measured the static capacity Cf of stator winding, then calculates (1-Cf/Cs) * 100%, if<0.5%, but pumpback paint liquid,
While carrying out described step 1, described stator is to be placed in the inner bag of described impregnating vessel, and also is provided with insulation board between the bottom of described stator and described inner bag,
While carrying out described step 1, described capacitance measuring device connect with described stator connected mode be a utmost point measure cable with
The lead-in wire of described stator winding connects, and another utmost point is measured cable and is connected with iron core or the support of described stator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN104901493B (en) * | 2015-06-11 | 2017-12-12 | 天津市天发重型水电设备制造有限公司 | High pressure armature winding major insulation and anti-halo layer hydraulic pressure one-step moulding method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1437786A (en) * | 1999-12-28 | 2003-08-20 | 阿尔斯托姆(瑞士)有限公司 | Method for producing a high-quality insulation of electric conductors or conductor bundles of rotating electrical machines using spray sintering |
| CN1625828A (en) * | 2002-01-31 | 2005-06-08 | 株式会社东芝 | Method for manufacturing insulated coil of rotating electric machine and insulated coil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6448408A (en) * | 1987-08-19 | 1989-02-22 | Hitachi Ltd | Insulating treating method of coil |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1437786A (en) * | 1999-12-28 | 2003-08-20 | 阿尔斯托姆(瑞士)有限公司 | Method for producing a high-quality insulation of electric conductors or conductor bundles of rotating electrical machines using spray sintering |
| CN1625828A (en) * | 2002-01-31 | 2005-06-08 | 株式会社东芝 | Method for manufacturing insulated coil of rotating electric machine and insulated coil |
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| Title |
|---|
| JP昭64-48408A 1989.02.22 |
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