永磁同步電動機外文翻譯范文

1、濱州學(xué)院本科畢業(yè)設(shè)計(外文翻譯) 畢業(yè)設(shè)計（外文翻譯）題 目永磁同步電動機直接轉(zhuǎn)矩控制系統(tǒng) 系 （院） 自動化系 專 業(yè) 電氣自動化技術(shù) 學(xué)生姓名 學(xué) 號 指導(dǎo)教師 職 稱 2011年 6月 15日3Always magnetic belt synchro motor direct torque control system0 - prefaceSynchro motor because of having power factor higher -, run - timeefficiency higher -, stability good, the revolving speed Heng

2、 settles to wait a merit, is extensively been applied to industrial production amid.The startingfault that acquaints with synchro motor, and debugging in time, all have important meaning to the motor and the production systemses.By wayof energy in time, accurate debugging and transaction fault, have

3、 tovsthefamiliar fault progress of the synchro motor in detail analytical!1 - Familiar fault1.1- The synchro motor after switching on electricity the incapability starts The synchro motor after starting the incapability run - time generally has the reason of severals as follows:(1) Power supply volt

4、age over low.Because at the square of voltage, the starting torque direct proportion of synchro motor's the voltage of power supply over make low the starting torque of synchro motor significantly the droop is lower than load troque, can not start thus and want to raise vs this power supply volt

5、age to enlarge the starting torque of dynamo.(2) The fault of motor.Check motor settle, the rotor winding had no short circuit, open circtui, open soldering and link bad etc. fault, these the faults will make the dynamo can not start to create starting of rating of intensity of magnetic field, make

6、thus the dynamo can not start;Checking the motor bearing has already had no failure, the port cap has have no loose, if bearing failure port shroud loose, result in bearing's down sinking, mutually rub with stator iron core, result in thus dynamo's canning not start, vs settle the rotor faul

7、t can be shaken table with the low tension, gradually click to check to seek a fault condition and adopt homologous treatment;The countersgaft accepts and carries to shroud a loose condition and all wants a pan car before driving each time and sees motor rotor whether slewing is vivid, if bearing or

8、 shaft kiowatt damage and replace in time.(3) The control device breaks down.This kind of faults are mostly the d.c. output voltage of the windings of Li magnetic belt to adjust not appropriate or don't output, result in the stator current of motor over big, cause the motor conduct electricity t

9、he run make or the losing of dynamo magnetic belt run - time.Should check whether output voltage current and its waveform that the Li magnetic belt equips is normal at this time, the Rong breaks whether the machine Rong breaks, the contact is bad;Whether circuit board plug-in puts prison or alignmen

10、t;Check loop resistance, put out whether crystal gate tube of magnet burns out or brokes through.(4) Mechanical trouble.Such as be dragged along a dynamic machinery to block, result in motor incapability's starting, the rotor that moves motor in response to the pan at this time sees whether the

11、slewing is vivid, machinery burden whether existence fault1.2- The synchro motor incapability leads long into synchronization. Synchro motor in common use law of nonsynchronous starting, throw in Li magnetic belt when the motor rotor revolving speed hits synchronous revolving speed of 95%, make it l

12、eads long into synchronization.The synchro motor incapability leads long into synchronous reason as follows:(1) The Li magnetic belt winding short circuit.Because the winding of Li magnetic belt, existence short circuit breaks down, as a result makes motor able to stabilize run - time but incapabili

13、ty and lead long into synchronization while being lower than synchronous revolving speed.Check to seek the Li magnetic belt winding short circuit, can open into low - tension(about the 30 Vs) in the rotor derivation on - line, put on the magnetic poles surface with a hand work steel saw, pursue insp

14、ection magnetic poles, if vibrating is violent, explain the magnetic poles to have no short circuit on steel saw of the magnetic poles' surface, if the vibrating of saw blade micro or don't flap, explain the magnetic poles short circuit.After unloading the magnetic poles, check the fault to

15、click, is short-circuit degree, adopt local to mend or re- round to make.(2) Power supply voltage over low.Power supply voltage over low, result in the strong Li link of the device of Li magnetic belt incapability working, make the motor incapability lead long into synchronization thus, the concrete

16、 way is to raise power supply voltage appropriately.(3) The fault of Li magnetic belt device.Such as throw Li over speedy(namely throw in Li magnetic belt, motor rotor revolving speed over low), will make the motor can not lead long into synchronization, should check to throw if the Li link exists f

17、ault at this time.If Li magnetic belt device fault, the output's current is lower than a rating value, cause the electricity magnetic troque of dynamo over small but can not lead long into synchronization, at this time in response to scrutiny Li magnetic belt device of throw Li link and phase -

18、shifting link, waveform use oscillograph to check to throw Li link and phase - shifting link, should also check and put out magnetic belt link and put out crystal gate of magnetic belt whether tube discovers a question as usual, handle in time, if the incapability handles in time, by way of the ener

19、gy quickly restore capacity, should replace to provide for use circuit board.1.3- Brush and compress tightly spring and gather to give or get an electric shock ring fault.The brush leads short and compresses tightly spring press scarcity and make brush and gather to give or get an electric shock rin

20、g of indirectly touch badly, thus generate spark or arc electric, arc electric or spark to on the other hand and easily spark short circuit, will make arc electric burn on the other hand shorter, spark open circtui thus, result in Li magnetic belt device only the Li magnetoelectricity press but have

21、 no Li magnetoelectricity streaming;Compress tightly spring ageing lapse, make brush and gather to give or get an electric shock ring of indirectly touch badly, effect the starting of motor thus;Gather to give or get an electric shock a ring surface to there is grease stain and scar or slot scar, wi

22、ll make brush and gather to give or get an electric shock ring of indirectly touch badly, generate spark, spark further burn gather to give or get an electric shock ring, will also make gnd short-circuit, the spark effects the starting of motor thus.For gather to give or get an electric shock ring s

23、uperficial grease stain, can wipe to clean with the acetone; For thin trace, use many fettle shagging rings of sandpapers surface, is ring surface roughness to hit R1.6 ums, if the slot scar obviously needs to get on the car bed transform, truning, enter amount of knife to take every time 1 mm as pr

24、oper, in the 1-1.5 ms/s, the truning speed control's roughness hits of the ums of R1.5-1.8 and becomes bad anti to finally polish with the sandpaper 2-3 times over the 0.05 mms.1.4- The damper winding breaks down.The damper winding of synchro motor rotor is provided for synchro motor starting to

25、 use and wipe - out run - time at the same time amid spark because of loading to change of out of step osc.Start the damper winding in the process to incise the magnetic field of stator revolution but induced very big starting current in the synchro motor, so the big current by all means will result

26、 in damping hair thermal expansion, under the normal condition because of starting time short, the damper winding starting is behind soon will cool off, but block up revolution in the motor, lack phase, start the super - in time to lengthways wait a condition down, if don't shut down in time, wi

27、ll result in the damping take off soldering to split etc. condition.The damper winding is weaker link in the synchro motor parts, the damper winding familiar fault has:The damping takes off soldering and split, the damping ring discharges wildfire, damping ring the strain is serious.These faults wil

28、l effect the starting of synchro motor. The damping takes off soldering and chooses silver actinium welding rod and adopts oxyacetylene welding to weld, the dynamo after taking out the core heats into rotor 200 Celsius degrees set rotor vertical in the oven, after taking out and adopt 750 Celsius de

29、grees to or soly weld temperature, damping and the blind side of of damping ring complete solderings are full, clear a soldering dirt again, ;For split of the damping , after dismantling original damping, choose the material of material homology and adopt the above-mentioned method to weld after pac

30、king good damping.Damping ring the wildfire is mainly what damping ring indirectly touches bad or get in touch with area isn't enough to result in. Damping ring the strain seriously is mainly a damping to fix anticoincidence in the slot, the damping plugs into damping ring while welding hole fal

31、sely, appear additional stress after welding, at plus damping ring intensity not enough to, treatment is loose open all connectivity bolts of damping rings, vs strain anti big of damping ring, after oxyacetylene welding heating adjust with the exclusive use fixture even, vs strain serious replace a

32、new damping of ring.2 - The solid instance is analyticalSolid instance 1 a synchro motor adopt nonsynchronous starting law, invest Li magnetoelectricity streaming post - but hard lead long into synchronization.Aim at the above-mentioned condition, halt after, check first whether power supply voltage

33、 is normal, then make use of multimeter and oscillograph vs the Li magnetic belt device scrutiny, the Li magnetoelectricity presses, whether current is normal, end is doubt a short-circuit of the winding of Li magnetic belt to, .Press the preceding paragraphs the method for giving, can open into low

34、 - tension in the rotor derivation on - line(about 30 Vs) ，put on the magnetic poles surface with a hand work steel saw, pursue an inspection magnetic poles, discover the vibrating of saw blade micro or don't flap and explain the magnetic poles' short circuit.After unloading the magnetic pol

35、es, use to shake a table inspection, recognize the magnetic poles winding's short circuit.Is further to check, discover depend outside layer of the 2 F wire full circle insulated failure, put coil in the oven to heat into 150 Celsius degrees, make wire full circle the insulated anneals and light

36、ly start to pry short-circuit section actinium row, use after the 0.03 mms the ring oxidizing glass cloth board packing sheet to go into, again brush 1 F 1032 paint after, put at the oven near roast dry, finally brush the 1 F 183# insulated lacquer, install magnetic poles.The dynamo after assembling

37、 the starting leads long into synchronization smoothly.Solid instance 2 some plant when a synchro motor start choked to death because of the machinery, start the super - in time to grow, don't park the car in time, again starting, the damping ring discharges.Aim at the above-mentioned condition,

38、 open a dynamo port box, check damping ring to become a "S" shape, damping and damping ring having take off soldering.The reason is analytical:The dynamo divides six most solid magnetic poleses and starts because of the multifarious heavy load and once appeared damping to take off solderin

39、g and split before, the damping ring transforms serious fault, adopted to repair soldering, damping replaced to split, replaced measures like damping ring,etc.If this adopts same transaction measure, the fault cans not get thoroughly removal. In consideration of the damping's ring is whole type

40、structure, the big current expanded severity because of heat rum while flowing, but solid magnetic poles again start only surface of magnetic belt Xue have fever and expand smaller, with of damping ring because of expand the degree is different, spark two of displacement with opposite creation and t

41、hermal stress, cause damping ring serious and take off faults like soldering,etc, .For overcoming this kind of bug, this carries on a remould to the damping's ring and cut into damping ring all 6-like in shape rings, in each ring both ends drilling one more a link a composition segment type damp

42、ing ring, can wipe - out the internal stress and thermal stress that whole damping ring generates like this.3 ConclusionWhen the synchro motor appears fault, cautiously analytical possible reason, gradually expel, look into related data when it's necessary, absorb experience, propose corrective

43、actions.Analytical the dynamo fault not only need to have firm theory knowledge and experience of prolific maintenance repairs, but also need to aim at concrete fault, deep consideration, brave creative, the dynamo after ensuring to break down removal can stabilize run - time over a long period of t

44、ime. 永磁同步電動機直接轉(zhuǎn)矩控制系統(tǒng)0 - 引言同步電動機由于具有功率因數(shù)高，運行效率高，穩(wěn)定性好，轉(zhuǎn)速恒定等優(yōu)點，被廣泛應(yīng)用于工業(yè)生產(chǎn)中。熟悉同步電動機的起動故障，并及時排除故障，對電動機本身及生產(chǎn)系統(tǒng)都有重要的意義。為了能及時、準確的排除故障和處理故障，必須對同步電動機的常見故障進行詳細分析！1 - 常見故障1.1-同步電動機通電后不能起動同步電動機起動后不能運行一般有以下幾個方面的原因：（1）電源電壓過低。由于同步電動機的起動轉(zhuǎn)矩正比于電壓的平方，電源的電壓過低使同步電動機的起動轉(zhuǎn)矩大幅下降，低于負載轉(zhuǎn)矩，從而無法起動，對此要提高電源電壓，以增大電機的起動轉(zhuǎn)矩。（2）電動機本身的故障

45、。檢查電動機定、轉(zhuǎn)子繞組有無短路、斷路，開焊和連接不良等故障，這些故障都會使電機無法建立起起動的額定的磁場強度，從而使電機無法起動；檢查電動機軸承有無損壞，端蓋有無松動，若軸承損壞端蓋松動，造成軸承下沉，與定子鐵心相摩擦，從而造成電機無法起動，對定轉(zhuǎn)子故障可以用低壓搖表，逐點查找故障情況，采取相應(yīng)的處理方法；對軸承和端蓋松動的情況，每次開車前都要盤車，看電動機轉(zhuǎn)子轉(zhuǎn)動是否靈活，如果軸承或軸瓦損壞，要及時更換。（3）控制裝置故障。此類故障多為勵磁繞組的直流輸出電壓調(diào)整不當或無輸出，造成電動機的定子電流過大，致使電動機過電流動作或電機的失磁運行。此時應(yīng)檢查勵磁裝置的輸出電壓電流及其波形是否正常，熔

46、斷器是否熔斷，接觸不良；電路板插件是否插牢或?qū)?；檢查回路電阻，滅磁鐵晶閘管是否燒斷或擊穿。（4）機械故障。如被拖動的機械卡住，造成電動機不能起動，此時應(yīng)盤動電動機的轉(zhuǎn)子看轉(zhuǎn)動是否靈活，機械負載是否存在故障。1.2-同步電動機不能牽入同步。 同步電動機常用的異步起動法，在電動機轉(zhuǎn)子轉(zhuǎn)速達到95%同步轉(zhuǎn)速時投放勵磁，使之牽入同步。同步電動機不能牽入同步的原因如下：（1）勵磁繞組短路。由于勵磁繞組、存在短路故障，因而不可能產(chǎn)生額定磁場強度，導(dǎo)致電動機只能在低于同步轉(zhuǎn)速下穩(wěn)定運行而不能牽入同步。查找勵磁繞組短路，可在轉(zhuǎn)子引出線上通入低電壓（約30V），用一根手工鋼鋸條放在磁極面上，逐個檢查磁極，如果

47、該磁極面上鋼鋸條振動劇烈，說明該磁極沒有短路，如果鋸條微振動或不振，說明該磁極短路。卸下該磁極后，檢查該故障點，是短路程度，采取局部修理或重新繞制。（2）電源電壓過低。電源電壓過低，造成勵磁裝置的強勵環(huán)節(jié)不能動作，從而使電動機不能牽入同步，具體辦法是適當提高電源電壓。（3）勵磁裝置的故障。如投勵過早（即投入勵磁時，電動機轉(zhuǎn)子轉(zhuǎn)速過低），會使電動機無法牽入同步，此時應(yīng)檢查投勵環(huán)節(jié)是否存在故障。如勵磁裝置故障，輸出的電流低于額定值，導(dǎo)致電機的電磁轉(zhuǎn)矩過小而無法牽入同步，此時應(yīng)仔細檢查勵磁裝置的投勵環(huán)節(jié)和移相環(huán)節(jié)，用示波器檢查投勵環(huán)節(jié)和移相環(huán)節(jié)的波形，還應(yīng)檢查滅磁環(huán)節(jié)滅磁晶閘管是否正常發(fā)現(xiàn)問題，及時處理，如不能及時處理，為了能快速恢復(fù)生產(chǎn)，應(yīng)更換備用電路板。1.3-電刷及壓緊彈簧、集電環(huán)故障。電刷過短，壓緊彈簧壓力不足，使得電刷和集電環(huán)之間接觸不良，從而產(chǎn)生火花或電弧，電弧或火花一方面易引起短路，另一方面會使電弧燒得更短，從而引起斷路，造成勵磁裝置只有勵磁電壓而無勵磁電流；壓緊彈簧老化失