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1、AC DC operation contactor technology why difficult promotion page 1 - Industrial Forum - Technology Center - China's industrial network return home brand news conferences download the application papers award industrial know BBS blog eliteTalent service market research industrial TV industrial c

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6、a download online tutorial automation technology training seminars for the current position of the prize essay professional books: Industrial Forum > the electrical components Forum"AC contactor DC operation technology is difficult to promoteLbssqh recommends deleting this post!Modification

7、of the06:17:25 2008-05-25 current AC contactor electromagnetic operating mechanism can generally be divided into two types: AC and DC operation.AC operation is the most common of a mode of operation, has the advantages of mature manufacturing technology, the disadvantage is to maintain power is larg

8、er, especially as cj20 such products, has been used without an insulating paint for silicon steel sheet, iron heating phenomenon is relatively serious. In order to solve this problem, the DC operation technology. DC operating technology, the basic solution to the energy consumption of AC operation a

9、nd the problem of the core coil heating, is a real technical progress. But until now, it has not been widely used.In the past six months, I carefully look for the technical information in this area, carefully study and comparative analysis, and from the perspective of manufacturers and users of this

10、 puzzling phenomenon.I think that these technologies have not been widely used, mainly due to the following aspects:First, most of the technology does not solve the problem of DC operation of part of the life, for example, many technology is used to switch, the use life of the switch is difficult th

11、an the contactor, long electrical life. For example, assume that the relay as a switch, then the service life of the relay is not less than 10 million times, and the electrical life of the contactor is not less than 100 million times (of course, is the nominal value), in the index, about worn a cont

12、actor contact, at least to 10 times maintenance - replace the relay, which in itself is a contradiction, originally the use of DC operation is reduced contactor damage, but the actual situation is increased maintenance costs.Followed by the DC operating system of a relatively large volume, it is har

13、d to directly installed in the interior of the contactor to mass production, only as a small range of technology improvement and under the specific environment, due to space limitations, cannot install DC operating device.Third, there are a number of technology there are some immature misunderstandi

14、ng. For example, some claims that can be used in wide voltage range, or even in the 380V - 110V operating voltage universal, according to my test, this is not possible. In this respect, not control technology is not, but the shell of the contactor can not bear. To CJX2-50 as an example 220V control

15、the DC resistance of the coil voltage is (temperature of 20 degrees) 118 Europe, iron core gap maximum AC impedance is 116 in Europe, both total 234 Europe, pull power maximum power is the L206W. In accordance with the technical requirements, contactor in the hot state must ensure that can reliably

16、pull in 85% of the rated voltage, which is considered the actual working condition of the contactor, is also the national standard, is cannot be violated. If we directly for DC operation, there will be the following: at 10 degrees below zero, the DC resistance of the coil of a contactor will by 118

17、Euro reduced to 105 in Europe and then, control voltage is 115% of the state, that is, 253V. Due to the DC operation, not the AC impedance factors, then pull the power is 609W, is three times the nominal power, so it is easy to hit bad contactor shell frame, especially the component. When I was test

18、ing, this was the case for many times. The contact component of CJX2-50, has been repeatedly damaged, because the attraction power was 700W.Fourth is the cost of the problem. Now the technology is focusing on the technology of AC contactor additional. Therefore, if want to let the contactor manufact

19、urer, will increase the cost of manufacturing, then manufacturer is bound to increase the sales price and the end user will not be accepted. This is the most reluctant manufacturers to accept the.These factors determine the current AC contactor DC operation technology is difficult to widely spreadTh

20、e total number of records for 46 of the total 1 pages of the current page 1931 4:Reference to replyManagement of theThe best answer is set.Operation technology of pulse width modulation of 17:31:30 lbssqh 1 floor 2008-05-25 AC contactorIn front of the AC contactor, I said the DC operation technology

21、 of the four questions, I conducted an experiment, the results of the experiment is gratifying.First, using the CJX2-50 (220V) AC contactor to carry out the experiment. Room temperature 20 degree test. First test the basic situation of the contactor:1, coil DC resistance 118 ohm,Pull the instantaneo

22、us current 0.94A 2, 220V, instantaneous power 206W,3, reliable pull in voltage 170V, minimum pull power 124W,4, the critical release voltage 120V, 100V reliable release, 120V - 100V between the bounce.5, temperature rise. Supply voltage 240V, operating frequency 1200 times / hour, the experimental t

23、ime of 1.5 hours, the coil surface temperature of 57 degrees, temperature rise 37 degrees.6, to maintain power. 25W time 220V.In amateur conditions, I can only do these tests. But for the operating mechanism, these indicators may be basically enough.Next, I did the control panel. The control panel i

24、s the use of the principle of pulse width modulation to control the operating mechanism of the ceiling to power, in the use of the original iron core coil, ceiling to power about 1.5W appearance, because it is a pulse DC million table also allowed measurement, can only be approximate figure. The str

25、ucture of the control panel is very simple, the size of only 9*35*19 mm, the principle is to control the cut-off time of each sinusoidal pulse to control the power of the coil, similar to the control of silicon conduction angle control. Using a delay electronic switch, operating system in a power tr

26、ansmission is, pull the full power, the attraction of the automatic conversion to maintain a small power. The making of the whole electronic circuit is quite smooth. The trouble is that the iron core and the coil.I made two iron core, one of the original iron core removed 40%, retained 60%. The othe

27、r is made of low carbon steel in accordance with the original shape of the iron core. Power experiment found that using core original restructuring is no problem, just after the pull of the noise, and finally to decide the reason mainly is restructuring process destroys the accuracy of the original

28、iron core, followed by core lamination structure and pulse circuit does not adapt. So basically abandoned the laminated core.Another is the overall structure of low carbon steel, the same size and the original core. After the experiment found that remanence is too strong, not breaking, so the Yamaga

29、ta core of a side arm amputated, this is can pull smoothly and broken.At this time, the coil the restructuring, the original enamelled copper wire changed enamelled copper wire, wire diameter also bold to 0.31 mm, into dozens of times, there is no problem, they received a self-made power automatic o

30、n-off controller experiment. Operating frequency 1200Times per hour. Temperature rise indicators are similar to the original contactor. But the results in 2 hours after the contact frame of the contactor was shocked. At the time that is caused by the asymmetry of the iron core, replaced with the ori

31、ginal iron core, the iron core is still using low carbon steel production of the iron core, the results will soon be bad two contact. When the measuring coil operating power, has reached more than 740 W, this time it is attracting high power see light suddenly. But at this time, CJX2-50 of the conta

32、ctor is used up, and I was looking for a CJ20-100 and 63 of the waste contactor to do the experiment.100A specification is still very fast is out of the question, is still a contact frame is shattered, at this time, I realized the importance of attracting power problem. When I rush to buy pure alumi

33、num paint covered wire, wire diameter 0.37, each coil around 1000 cycles, iron core thickness by original 30 mm reduced to 18 mm coil series resistance 20 degrees 60 euro, the experiment made good effect.The basic indicators are as follows: (room temperature 19 degrees)1, pull in voltage 150V,2, pul

34、l the minimum power 375W,3, 220V suction power when 4.4W,4, the breaking speed with the naked eye and the original contactor basically no changeReference to replyManagement of theThe best answer is set.23:14:48 2008-05-25 2, the building of theOh, DC operation of AC contactor and a problem: the coil

35、 of the contactor is good or bad bad the multimeter is used to judge and I met for the first time the contact head when around big, coil DC resistance of a few m ou (contactor with rectifying element), the thought was bad, spent a great effort to understand.Reference to replyManagement of theThe bes

36、t answer is set.23:41:53 2008-05-25 3 floor, the power of the country is not mandatory standards also have a relationship, contact the European Department to see a completely different reference to the return of theManagement of theThe best answer is set.| 2008-05-26 05:24:43 lbssqh on the 4 floor,

37、AC contactor, pulse width modulation of DC operating mechanism during the trialUnderstanding of several issuesWhy choose one, pulse width modulation and power control.AC contactor AC electromagnetic operating mechanism, the DC operation has many advantages, such as energy saving, low noise, not easy

38、 to burn coils and so on. DC operation of the way there are many kinds, such as double coil, the use of the transformer, the current limit of resistance, capacitance and so on. But the way it looks easy, but there are also difficult to overcome the shortcomings, the mentioned above, mainly is bulky,

39、 requiring mechanical switch, difficult and the existing contactor shell frame directly. In this context, I make the pulse width modulation and power control board, the basic principle is using an electronic timing switch, a circuit to start electrical, control voltage are applied to the electromagn

40、etic coil when contactor execution and sucking action, after a period of time (the specific length according to the different type of the contactor and is generally tens to hundreds of milliseconds), the electronic switch is automatically converted to maintain state. In maintaining state, the electr

41、onic switch in pulse width modulated state, it of every AC half wave width modulation to control the power of the electromagnetic coil in the solenoid pull small power state. In this way, reached the keep is attracted reliably and small power. And the electronic circuit has no electrolytic capacitor

42、 and a contact switch, so its life is very long. At the same time, the structure of the electronic circuit is very simple, the volume is very small, can be relatively easy and current contactor with, suitable for the existing contactor shell frame based on mass production.Two, the understanding of t

43、he contactor iron core and coil heating problem.Now there are a lot of technical introduction, AC contactor to DC operation, completely solve the contactor iron core and coil heating problem, I think this is not complete. Should be the basic solution to the absorption of the heat problem. But for fr

44、equent operation and cause the coil heating problem, then there is no way to solve the basic. We still CJX2-50 for cases, in the operation of AC, DC resistance of the coil is 118 euro and AC impedance is 116 in Europe, the total 234 in Europe, 220V pull in instantaneous power is 207W, but if not coi

45、l transformation, and direct change for DC operation, then in the 220V instantaneous suction power is 410W, one times bigger than the AC operation power, then the heat certainly a lot of, visible in the frequent operation fever but than AC operation more serious.For the core fever is due to loss cor

46、es of fever and change for DC operation, the nature of the settlement of this problem. I use is the pulse current, there are also some iron loss, but due to the dissipation power is very small, then elevated temperature of stator core caused by iron loss can ignore.Therefore, the DC operation techno

47、logy can only solve the contactor in the state of the iron core coil heating problems, and can not solve the problem of frequent operation of the contactor caused by heating.Three, the noise of the contactorAC operation of the contactor, due to the damage of the short circuit ring, will produce a lo

48、t of noise, DC operation, there is no such situation. But the problem is that what we now call the DC operation and pulsating DC operation, is not straight DC operation. Therefore, as long as the contactor iron core to pull is not close, or core of the silicon steel sheet is riveted not firm still c

49、an bring AC noise.What we now call the DC operation technology, has been listed as "energy saving device for AC contactor", and national standards, in the standard for energy-saving device for contactor noise shall not be greater than 20 dB, apparently the noise indicators are difficult to

50、 achieve. Because I was a lot of noise meter index, lower limit of measurement is about 30 34 dB, so I think this index have a problem in factories or other places using the contactor, the need for such a high noise indicators?Four, the structure of the contactor iron core. After giving up the stack

51、 structure, I try to use the whole structure, the precision casting iron core, the thickness of the original iron core 60%, the other size unchanged, the coil framework to change. From the current situation, the cost is lower than the original structure of the stack, mainly used to reduce the. At th

52、e same time, the overall structure greatly reduces the noise absorption (no measurement, basically can not hear). Another benefit of the whole structure is that the old iron core can be recycled and used, but it is very difficult to do this.After the volume of the overall structure decreases, the pr

53、oblem is the need to increase the power of the coil, but this is obviously not a big problem. Because the CJX2-50 after the reform of the suction power is less than 2W.Five, the electromagnetic compatibility of electronic circuits. The electronic circuit is controlled by the pulse width modulation,

54、so there must be some electromagnetic interference. I trial production of the control circuit of the working state, is a sinusoidal waveform of the DC pulse, the pulse of the electronic pulse switch to open two times, that is, to open 200 times per second, the pulse frequency is 200 hz. AC contactor

55、 energy saving devices, the national standard: energy saving devices have electronic circuits, but the pulse frequency of 9 kHz, do not do electromagnetic interference experiment. Obviously, this electronic circuit can not take into account the problem of pulse emission interference.Reference to rep

56、lyManagement of theThe best answer is set.| 2008-05-26 14:11:17, 5th floor, crayon Shinchan not eat green peppers, I would like to ask about: tell the landlord is not that exchange contact device, DC coil, with continued diode to protect the flow?I have seen the train on the SIEMENS contactor is lik

57、e thisReference to replyManagement of theThe best answer is set.14:29:04 2008-05-26 6 floor, Jim learning, learning Oh!Management of theThe best answer is set.19:25:48 2008-05-26 7 floor, lbssqh, I would ask: the landlord is talking about the AC contact device, DC coil, with a continuous flow diode

58、protection?I've seen the train., SIEMENS contactor is like this=I don't know the train on the train, but I think it should be a DC contactor.Reference to replyManagement of theThe best answer is set.19:35:00 2008-05-26 8 floor, huaizhou learn to thank the landlord! Reference to replyManagement of theThe best answer is set.11:54:32 2008-05-27 9 floor, there is wind study, learning Oh!Management of theThe best a