CN102780339A - 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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- CN102780339A CN102780339A CN2012102813939A CN201210281393A CN102780339A CN 102780339 A CN102780339 A CN 102780339A CN 2012102813939 A CN2012102813939 A CN 2012102813939A CN 201210281393 A CN201210281393 A CN 201210281393A CN 102780339 A CN102780339 A CN 102780339A
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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 (VPI) of vacuum pressure is handled, good insulation preformance, temperature rise reduces; Raise the efficiency, increase mechanical strength, solve the loosening phenomenon of winding at running; Prevent insulation faults such as short circuit in winding, improve moistureproof ability, increase the service life.Motor stator VPI technology is in special container, through vacuumizing the air of bar insulation interlayer to be got rid of, and with high pressure solvent-free immersion paint liquid is injected insulating barrier, place again mould through the high temperature baked and cured make insulate into as a whole.Motor stator VPI the most important thing is in insulating barrier whether lacquer liquid fully soaks into.Liquid is insufficient to be soaked into if coat with lacquer, after the insulation baked and cured, and the inner air gap that takes place easily of insulating barrier; Thereby the generation electric discharge phenomena influence the electrical machine insulation life-span, make motor on-stream; Bring the danger of insulation breakdown, directly influence motor properties and useful life.Therefore, whether the judgement electrical machine insulation is put in order soaks into, and is that electrical machine insulation is handled very crucial operation.Conventional motors stator VPI technology is just controlled technological parameter (vacuum degree, pressure, pressing time etc.), and to whether soaking into the monitoring of having no idea behind the 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 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 may further comprise the steps:
Step 1 is placed on stator in the impregnating vessel earlier, capacitance measuring device is connected on the stator again, vacuumizes then;
Step 3 behind lacquer liquid submergence motor stator, is pressurizeed and pressurize in the time period of setting, and in pressure maintaining period, per hour measures the static capacity of a stator winding;
Step 4 after pressurize finishes, is calculated the static capacity increment rate Δ hourly C of stator winding in the pressure maintaining period earlier, measures the static capacity Cs of stator winding before pressure relief again, calculates Cs/C0 then;
Step 5, the static capacity of the judging stator winding state that whether reaches capacity, any condition among must meet the following conditions a and the condition b:
A. if Cs/C0＞constant, the static capacity that then the draws stator winding state that reaches capacity, but pressure relief to normal pressure, if Cs/C0≤constant, the static capacity that then the draws stator winding state that do not reach capacity needs to prolong 1～3 hour dwell time;
B. if Δ C=0, the static capacity that then 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 then the draws stator winding state that reaches capacity, otherwise, 1～3 hour dwell time prolonged; And in the dwell time section that prolongs, per hour measure the static capacity of a stator winding, recomputate Δ C again, up to satisfying condition;
Step 6, pressure relief are measured the static capacity Cf of stator winding earlier to normal pressure, calculate (1-Cf/Cs) * 100% again, if＜0.5%, but pumpback lacquer liquid.
The method for supervising of the whole soaking technology of above-mentioned motor stator vacuum pressure, wherein, when carrying out said step 1, said stator is to be placed in the inner bag of said impregnating vessel, and also is provided with insulation board between the bottom of said stator and said inner bag.
The method for supervising of the whole soaking technology of above-mentioned motor stator vacuum pressure; Wherein, When carrying out said step 1; It is that utmost point measurement cable is connected with the lead-in wire of said stator winding that said capacitance measuring device connects with said stator connected mode, and another utmost point is measured cable and is connected with the iron core or the support of said stator.
The method for supervising of the whole soaking technology of motor stator vacuum pressure of the present invention; Being employed in stator soaks in (being VPI) process in that vacuum pressure is whole; The size and the rate of change of the static capacity through 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, the insulation processing of motor is had extremely important effect, have very great help improving the quality of products.
Description of drawings
Fig. 1 is that motor stator is in the view of carrying out VPI;
Fig. 2 is the change curve of motor stator static capacity of stator winding in carrying out the VPI process.
Embodiment
For the technical staff who makes the present technique field can understand technical scheme of the present invention better, its embodiment is at length explained below in conjunction with accompanying drawing:
See also 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 may further comprise the steps:
Step 1 earlier is placed on stator 1 in the inner bag 21 of impregnating vessel 2 and between the bottom of stator 1 and inner bag 21, insulation board 22 is set, as if there being a plurality of workpiece to be placed on simultaneously in the inner bag 21; Workpiece can not contact with the wall of inner bag 21, and workpiece can not contact with workpiece, the LCR capacitance measuring device is connected on the stator 1 again; Utmost point on the 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, elder generation, measures cable to a utmost point again and is connected on the copper wire leaded linking together with copper wire; Another utmost point is measured cable 32 and is connected with the iron core or the support of stator; Require tie point not have insulants such as paint, guarantee ground connection, in the time period T1 that sets, impregnating vessel 2 is vacuumized then;
Step 3 behind lacquer liquid submergence motor stator 1, is pressurized to the pressure and the pressurize of setting in the time period T3 that sets, in pressure maintaining period, per hour measure the static capacity C of a stator winding;
Step 4 after pressurize finishes, is calculated the static capacity increment rate Δ hourly C of stator winding in the pressure maintaining period earlier, measures the static capacity Cs of stator winding before pressure relief again, calculates Cs/C0 then;
Step 5, the static capacity of the judging stator winding state that whether reaches capacity, any condition among must meet the following conditions a and the condition b:
A. if Cs/C0＞constant (this constant is according to different motors are carried out the test of dielectric loss and the data that partial discharge test draws); The static capacity that then the draws stator winding state that reaches capacity; But pressure relief is to normal pressure; If Cs/C0≤constant, the static capacity that then the draws stator winding state that do not reach capacity needs to prolong 1～3 hour dwell time;
B. if Δ C=0, the static capacity that then 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 then the draws stator winding state that reaches capacity with linearity; Otherwise, prolong 1～3 hour dwell time, and in the dwell time section that prolongs, per hour measure the static capacity of a stator winding; Recomputate Δ C again, up to satisfying condition, the static capacity of stator winding just reaches capacity;
Step 6, pressure relief are measured the static capacity Cf of stator winding earlier to normal pressure, calculate (1-Cf/Cs) * 100% again, if＜0.5%, can be with the lacquer liquid pumpback in the inner bag 21 of impregnating vessel 2.
Method for supervising of the present invention judges through the 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, has very great help to improving the quality of products.This method for supervising can improve stator and put in order the quality control ability in (VPI) process of soaking at vacuum pressure.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the present invention; And be not to be used as qualification of the present invention; As long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (3)
1. the method for supervising of the whole soaking technology of a motor stator vacuum pressure is characterized in that said determination methods may further comprise the steps:
Step 1 is placed on stator in the impregnating vessel earlier, capacitance measuring device is connected on the stator again, vacuumizes then;
Step 2 after impregnating vessel reaches vacuum, is measured the static capacity Co of stator winding earlier, and lacquer liquid reinjects;
Step 3 behind lacquer liquid submergence motor stator, is pressurizeed and pressurize in the time period of setting, and in pressure maintaining period, per hour measures the static capacity of a stator winding;
Step 4 after pressurize finishes, is calculated the static capacity increment rate Δ hourly C of stator winding in the pressure maintaining period earlier, measures the static capacity Cs of stator winding before pressure relief again, calculates Cs/C0 then;
Step 5, the static capacity of the judging stator winding state that whether reaches capacity, any condition among must meet the following conditions a and the condition b:
A. if Cs/C0＞constant, the static capacity that then the draws stator winding state that reaches capacity, but pressure relief to normal pressure, if Cs/C0≤constant, the static capacity that then the draws stator winding state that do not reach capacity needs to prolong 1～3 hour dwell time;
B. if Δ C=0, the static capacity that then 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 then the draws stator winding state that reaches capacity, otherwise, 1～3 hour dwell time prolonged; And in the dwell time section that prolongs, per hour measure the static capacity of a stator winding, recomputate Δ C again, up to satisfying condition;
Step 6, pressure relief are measured the static capacity Cf of stator winding earlier to normal pressure, calculate (1-Cf/Cs) * 100% again, if＜0.5%, but pumpback lacquer liquid.
2. the method for supervising of the whole soaking technology of motor stator vacuum pressure according to claim 1; It is characterized in that; When carrying out said step 1, said stator is to be placed in the inner bag of said impregnating vessel, and also is provided with insulation board between the bottom of said stator and said inner bag.
3. the method for supervising of the whole soaking technology of motor stator vacuum pressure according to claim 1; It is characterized in that; When carrying out said step 1; It is that utmost point measurement cable is connected with the lead-in wire of said stator winding that said capacitance measuring device connects with said stator connected mode, and another utmost point is measured cable and is connected with the iron core or the support of said stator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210281393 CN102780339B (en) | 2012-08-09 | 2012-08-09 | Monitoring method for motor stator vacuum pressure full-impregnation process |
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| CN 201210281393 CN102780339B (en) | 2012-08-09 | 2012-08-09 | Monitoring method for motor stator vacuum pressure full-impregnation process |
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| CN102780339A true CN102780339A (en) | 2012-11-14 |
| CN102780339B CN102780339B (en) | 2013-12-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901493A (en) * | 2015-06-11 | 2015-09-09 | 天津市天发重型水电设备制造有限公司 | One-time hydraulic forming method for major insulation and anti-corona layer of high-voltage armature winding |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6448408A (en) * | 1987-08-19 | 1989-02-22 | Hitachi Ltd | Insulating treating method of coil |
| 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 |
-
2012
- 2012-08-09 CN CN 201210281393 patent/CN102780339B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6448408A (en) * | 1987-08-19 | 1989-02-22 | Hitachi Ltd | Insulating treating method of coil |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901493A (en) * | 2015-06-11 | 2015-09-09 | 天津市天发重型水电设备制造有限公司 | One-time hydraulic forming method for major insulation and anti-corona layer of high-voltage armature winding |
| 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 |
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| CN102780339B (en) | 2013-12-18 |
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