產(chǎn)品詳情
[B]1、紙機(jī)傳動(dòng)特性與變頻器機(jī)械特性[/B]
造紙機(jī)傳動(dòng)屬于恒轉(zhuǎn)矩負(fù)載，所以請求電機(jī)選用恒轉(zhuǎn)矩調(diào)速。請求變頻器作業(yè)在恒轉(zhuǎn)矩調(diào)速操控狀況，所以應(yīng)當(dāng)選用恒轉(zhuǎn)矩機(jī)械負(fù)載變頻器。
有的公司關(guān)于恒轉(zhuǎn)矩調(diào)速和恒功率調(diào)速選用不一樣類型的變頻器，如西門子公司的ECO風(fēng)機(jī)、水泵操控用變頻器和MDV、6SE70恒轉(zhuǎn)矩變頻器。有的公司關(guān)于恒轉(zhuǎn)矩調(diào)速和恒功率調(diào)速選用同一類型的變頻器，關(guān)于同一臺變頻器選用不一樣的操控方法所接配的電機(jī)不一樣，變頻器內(nèi)部參數(shù)設(shè)置不一樣。如ABB公司ACS400、ACS600系列變頻器。比方類型為ACS401-0030的變頻器在恒轉(zhuǎn)矩調(diào)速操控接配電機(jī)22Kw，在風(fēng)機(jī)、水泵恒功率操控接配電機(jī)為30Kw。所以用戶應(yīng)當(dāng)了解變頻器的機(jī)械特性匹配。
[B]2、頻率分辨率對紙機(jī)傳動(dòng)功用的影響[/B]
頻率分辨率是衡量變頻器的主要目標(biāo)。頻率分辨率包括頻率給定分辨率和頻率操控分辨率。
1、頻率給定分辨率指變頻器的給定通道對輸入信號的分辨率，通常指模仿輸入通道AD的位數(shù)。關(guān)于通訊通道通常給定精度遠(yuǎn)遠(yuǎn)大于模仿通道，所以模仿給定通道若能滿意請求，通訊通道是肯定滿意的。
通常紙機(jī)對傳動(dòng)調(diào)速的操控精度請求為0.1%，關(guān)于一臺斷定的造紙機(jī)從頻率分辨率的角度來說，若能在最低速滿意給定操控精度，則在高速作業(yè)是沒有問題的。下面咱們舉例說明：
設(shè)本臺紙機(jī)在低速抄紙，變頻器作業(yè)頻率為10Hz，則請求給定精度為：10*0.1%=0.01Hz
所以請求變頻器的頻率分辨率有必要可以小于0.01Hz。
設(shè)本臺紙機(jī)在高速抄紙，變頻器作業(yè)頻率為50Hz，則請求給定精度為：
50*0.1%=0.05Hz
所以請求變頻器的頻率分辨率有必要可以小于0.05Hz。
所以咱們在挑選傳動(dòng)體系時(shí)留意紙機(jī)低速時(shí)變頻器能否滿意操控精度的請求。而不必憂慮高速的給定精度。給定精度也可以通過變頻器參數(shù)來進(jìn)行調(diào)理，但缺點(diǎn)是在改動(dòng)作業(yè)狀況時(shí)需求從頭調(diào)整參數(shù)。
如一臺用于流漿箱操控的上漿泵變頻器，其作業(yè)頻率通常在30~50Hz之間，操控選用SR73A調(diào)理器，但是流漿箱液位無法安穩(wěn)，上漿量忽大忽小，變頻器一直調(diào)理不能安穩(wěn)。因素變頻器設(shè)定分辨率不行。給定忽大忽小，1mA對應(yīng)2.5Hz。咱們可以調(diào)理參數(shù)，變頻器的最小給定為30Hz，即給定0mA對應(yīng)30Hz，給定20mA對應(yīng)50Hz，這么1mA對應(yīng)1Hz，給定頻率分辨率進(jìn)步了2.5倍。
2、頻率操控分辨率指變頻器的輸出最小分辨率，通常說變頻器是無級調(diào)速是相對而言的。變頻器有它的最小分辨率，每次調(diào)速頻率的最小改變。如今變頻器的最小分辨率通常為0.01Hz。用戶在挑選變頻器時(shí)應(yīng)當(dāng)留意頻率分辨率是否能滿意設(shè)備需求。
3、具有轉(zhuǎn)差抵償變頻器對體系穩(wěn)態(tài)精度的影響
溝通異步電機(jī)都存在轉(zhuǎn)差頻率，電機(jī)的輸出轉(zhuǎn)矩和功率與轉(zhuǎn)差頻率成正比，變頻器為了進(jìn)步速度操控精度，對電機(jī)操控選用轉(zhuǎn)差抵償。
根據(jù)異步電機(jī)的機(jī)械特性，當(dāng)負(fù)載轉(zhuǎn)矩增大，轉(zhuǎn)差頻率增大，轉(zhuǎn)子發(fā)生速降。轉(zhuǎn)差抵償即是運(yùn)用根據(jù)負(fù)載改動(dòng)定子同步頻率，以抵償轉(zhuǎn)子因?yàn)樨?fù)載的速降，消除調(diào)速靜差，從而確保轉(zhuǎn)子的速度保持穩(wěn)定。
變頻器的轉(zhuǎn)差抵償根據(jù)電機(jī)的機(jī)械特性進(jìn)行，變頻器請求輸入電機(jī)銘牌參數(shù)，根據(jù)銘牌參數(shù)來斷定電機(jī)的操控?cái)?shù)學(xué)模型，轉(zhuǎn)差抵償量應(yīng)為：
因?yàn)殡姍C(jī)在變頻操控調(diào)速過程中，不一樣公司的電機(jī)的阻抗不一樣，所以轉(zhuǎn)差抵償在有時(shí)是欠抵償，有時(shí)為過抵償。因而對體系穩(wěn)態(tài)、動(dòng)態(tài)精度會有必定的影響。
所以在運(yùn)用變頻器的過程中合理運(yùn)用轉(zhuǎn)差抵償會消除靜差，進(jìn)步體系的穩(wěn)態(tài)精度。調(diào)理轉(zhuǎn)差抵償可以獲得特別的機(jī)械特性，在板紙機(jī)、瓦楞紙機(jī)調(diào)試作業(yè)中非常主要。
4、變頻器功用的基本請求
紙機(jī)對變頻器功用的請求與挑選的上位操控體系有關(guān)，不一樣的操控方法對變頻器的功用有不一樣的請求。紙機(jī)通常請求在操作臺上可以對變頻器進(jìn)行起停、匍匐/作業(yè)、速度微調(diào)等操控操作；可以顯現(xiàn)分部線速度、電機(jī)電流等功用；可以顯現(xiàn)變頻器作業(yè)狀況等功用。
下面羅列在不一樣的操控方法下對變頻器的功用請求。
1、模仿操控與速度鏈操控器操控：
請求變頻器有兩路以上的模仿量輸入和輸出功用；兩路以上的數(shù)字量輸入功用；兩路數(shù)字量輸出功用。
兩路模仿量輸入用于速度給定和反應(yīng)輸入，第三路模仿量輸入用于速度附加給定操控。兩路模仿量輸出一路用于顯現(xiàn)分部線速度，一路用于顯現(xiàn)變頻器輸出電流。兩路以上的數(shù)字量輸入用于起起停操控和匍匐/作業(yè)變換操控。兩路數(shù)字量輸出用于顯現(xiàn)變頻器的作業(yè)狀況。
2、電動(dòng)電位器操控方法：
請求變頻器有兩路模仿量輸出功用；四路以上的數(shù)字量輸入功用；兩路數(shù)字量輸出功用。
兩路模仿量輸出一路用于顯現(xiàn)分部線速度，一路用于顯現(xiàn)變頻器輸出電流。兩路數(shù)字量輸入用于起停操控和匍匐/作業(yè)變換操控；兩路數(shù)字量用于速度微調(diào)操控。兩路數(shù)字量輸出用于顯現(xiàn)變頻器的作業(yè)狀況。
3、plc通訊操控方法
PLC通訊操控方法按照操作方法分有兩種操控方法，一種是選用傳統(tǒng)的按鈕操作方法，另一種為觸摸屏操作方法。這兩種操控方法請求變頻器有通訊操控功用和對應(yīng)的通訊適配器。如Modbus網(wǎng)絡(luò)請求有Modbus通訊板；Profibus—DP總線請求有Profibus—DP通訊板。
（1）、按鈕操控方法請求變頻器有兩路模仿量輸出功用；兩路的數(shù)字量輸入功用；兩路數(shù)字量輸出功用。兩路模仿量輸出一路用于顯現(xiàn)分部線速度，一路用于顯現(xiàn)變頻器輸出電流。兩路數(shù)字量輸入用于起停操控和匍匐/作業(yè)變換操控；兩路數(shù)字量輸出用于顯現(xiàn)變頻器的作業(yè)狀況。
（2）、觸摸屏操控方法請求變頻器有一路數(shù)字量輸入，用于急停功用。其它顯現(xiàn)操控都在觸摸屏上進(jìn)行。
[B]5、結(jié) 語[/B]
該特一臺造紙機(jī)能否正常作業(yè)并能使所生產(chǎn)出的商品滿意客戶的請求，不僅僅是技術(shù)一方面所能決議，其電氣傳動(dòng)操控體系起了無足輕重的效果。因而，怎么挑選一套好的傳動(dòng)體系（即挑選一種此體系的中心裝置—變頻器）就顯得尤為主要，文中為作者從事多年造紙傳動(dòng)體系設(shè)計(jì)有關(guān)作業(yè)的所得，供大家參閱。
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Motorola MVME197LE 50MHz 32MB (NEW)
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Motorola MVME197LE/MVME297-003 50MHz 192MB
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Motorola MVME197LE/MVME297-128 50MHz 192MB
Motorola MVME197QP 512MB
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Motorola MVME2432-1
Motorola MVME2432-3
Motorola MVME2433-1
Motorola MVME2433-3
Motorola MVME2600-2
Motorola MVME2603-2131A
Motorola MVME2603-3141
Motorola MVME2603-3151
Motorola MVME2604-1131A
Motorola MVME2604-1141A
Motorola MVME2604-2141A
Motorola MVME2604-3321
Motorola MVME2604-3331
Motorola MVME2604-3341
Motorola MVME2604-3351
Motorola MVME2604-3361
Motorola MVME2604-3371
Motorola MVME2700-1221
Motorola MVME2700-1231
Motorola MVME2700-1241
Motorola MVME2700-1251
Motorola MVME2700-1261
Motorola MVME2700-1321
Motorola MVME2700-1331
Motorola MVME2700-1341
Motorola MVME2700-1351
Motorola MVME2700-1361
Motorola MVME2700-1421
Motorola MVME2700-1431
Motorola MVME2700-1441
Motorola MVME2700-1451
Motorola MVME2700-1461
Motorola MVME2700-3221
Motorola MVME2700-3231
Motorola MVME2700-3241
Motorola MVME2700-3251
Motorola MVME2700-3261
Motorola MVME2700-3321
Motorola MVME2700-3331
Motorola MVME2700-3341
Motorola MVME2700-3351
Motorola MVME2700-3361
Motorola MVME2700-3421
Motorola MVME2700-3431
Motorola MVME2700-3441
Motorola MVME2700-3451
Motorola MVME2700-3461
Motorola MVME2700-4221
Motorola MVME2700-4231
Motorola MVME2700-4241
Motorola MVME2700-4251
Motorola MVME2700-4261
Motorola MVME2700-4321
Motorola MVME2700-4331
Motorola MVME2700-4341
Motorola MVME2700-4351
Motorola MVME2700-4361
Motorola MVME2700-4421
Motorola MVME2700-4431
Motorola MVME2700-4441
Motorola MVME2700-4451
Motorola MVME2700-4461
Motorola MVME297-002 64MB
Motorola MVME297-003 128MB
Motorola MVME297-004 256MB
Motorola MVME297-128 128MB
Motorola MVME300
Motorola MVME300
Motorola MVME300A
Motorola MVME315
Motorola MVME316
Motorola MVME320A
Motorola MVME323
Motorola MVME323-1
Motorola MVME323S
Motorola MVME327A
Motorola MVME328-1
Motorola MVME328S-1
Motorola MVME328S-2
Motorola MVME328XT-1
Motorola MVME328XT-2
Motorola MVME330-2
Motorola MVME331
Motorola MVME332
Motorola MVME332XT
Motorola MVME332XTS
Motorola MVME332XTS
Motorola MVME333-2
MVME333
Motorola MVME333S-2 MVME333S MVME333S-002
Motorola MVME333S-2 MVME333S MVME333S-002
Motorola MVME334
Motorola MVME334A
Motorola MVME334B
Motorola MVME335
Motorola MVME336SIO
Motorola MVME337-1
Motorola MVME338
Motorola MVME339
Motorola MVME341 MVME341A
Motorola MVME350
Motorola MVME3604-1131 MVME3604-1
Motorola MVME3604-1141
Motorola MVME3604-1151
Motorola MVME3604-5332
Motorola MVME3604-5342
Motorola MVME3604-5352
Motorola MVME3604-6342
Motorola MVME3604-6352
Motorola MVME372
Motorola MVME374
Motorola MVME374-1
Motorola MVME376
Motorola MVME385
Motorola MVME385-120
Motorola MVME393
Motorola MVME4604-1141 Dual 200MHz 64MB
Motorola MVME4604-5362 Dual 300MHz 256MB
Motorola MVME4604-5462
Dual 400MHz 256MB
Motorola MVME5100-0131
Motorola MVME5110-2251
Motorola MVME705-1
Motorola MVME705A
Motorola MVME705A
Motorola MVME705B
Motorola MVME710B
Motorola MVME712-104
Motorola MVME712M
Motorola MVME712M MVME712/M
Motorola MVME714
Motorola MVME719
Motorola MVME741
Motorola MVME742
Motorola MVME761-001
Motorola MVME761EXT
Motorola MVME785-MIC
Motorola MVME854TK 01-W2755D01C
Motorola MVME946
Motorola MVPI300
Motorola MVSB741
Motorola PMC-Span 01-W3298F01A
Motorola PPMC750-1231
Motorola PV5300B33
Motorola SMMXER3E100X0
Motorola SuperNode system with the following boards: 01-W1589B01C 01-W1590B01B 01-W1591B04L 01-W1644B04BB 01-W2844D01H 01-W2844D02H 01-W2845D03G 01-W2845D04G 01-W3896B01F
Motorola TMCP700-001
Motorola XR-342 XR342
Motorola XR712-121K
Motorola XR712-123TPK
