1756-OA8D
1756-OA8D電力拖動(dòng)方式分獨(dú)立拖動(dòng)和集中拖動(dòng)。電氣傳動(dòng)的趨勢(shì)是多電動(dòng)機(jī)拖動(dòng)，這不僅能縮短機(jī)械傳動(dòng)鏈，提高傳動(dòng)效率，而且能簡(jiǎn)化總體結(jié)構(gòu)，便于實(shí)現(xiàn)自動(dòng)化。具體選擇時(shí)，可根據(jù)工藝與結(jié)構(gòu)決定電動(dòng)機(jī)的數(shù)量。
大型、重型設(shè)備的主運(yùn)動(dòng)和進(jìn)給運(yùn)動(dòng)，應(yīng)盡可能采用無(wú)級(jí)調(diào)速，有利于簡(jiǎn)化機(jī)械結(jié)構(gòu)、降低成本；精密機(jī)械設(shè)備為保證加工精度也應(yīng)采用無(wú)級(jí)調(diào)速；對(duì)于一般中小型設(shè)備，在沒(méi)有特殊要求時(shí)，可選用經(jīng)濟(jì)、簡(jiǎn)單、可靠的三相籠型異步電動(dòng)機(jī)
對(duì)于恒功率負(fù)載和恒轉(zhuǎn)矩負(fù)載，在選擇電動(dòng)機(jī)調(diào)速方案時(shí)，要使電動(dòng)機(jī)的調(diào)速特性與生產(chǎn)機(jī)械的負(fù)載特性相適應(yīng)，這樣可以使電動(dòng)機(jī)得到充分合理的應(yīng)用。
正確選擇電動(dòng)機(jī)容量是電動(dòng)機(jī)選擇中的關(guān)鍵問(wèn)題。電動(dòng)機(jī)容量計(jì)算有兩種方法，一種是分析計(jì)算法，另一種是統(tǒng)計(jì)類比法。分析計(jì)算法是按照機(jī)械功率估計(jì)電動(dòng)機(jī)的工作情況，預(yù)選一臺(tái)電動(dòng)機(jī)，然后按照電動(dòng)機(jī)實(shí)際負(fù)載情況做出負(fù)載圖，根據(jù)負(fù)載圖校驗(yàn)溫升情況，確定預(yù)選電動(dòng)機(jī)是否合適，不合適時(shí)再重新選擇，直到電動(dòng)機(jī)合適為止。
熱繼電器是一種利用電流的熱效應(yīng)工作的保護(hù)電器。熱繼電器由發(fā)熱元件(電阻絲)、雙金屬片、傳導(dǎo)部分和常閉觸點(diǎn)組成，當(dāng)電動(dòng)機(jī)過(guò)載時(shí)，通過(guò)熱繼電器中發(fā)熱元件的電流增加，使雙金屬片受熱彎曲，帶動(dòng)常閉觸點(diǎn)動(dòng)作。熱繼電器常用于電動(dòng)機(jī)的長(zhǎng)期過(guò)載保護(hù)。當(dāng)電動(dòng)機(jī)長(zhǎng)期過(guò)載時(shí)，熱繼電器的常閉觸點(diǎn)動(dòng)作，斷開相應(yīng)的回路，使電動(dòng)機(jī)得到保護(hù)。由于雙金屬片的熱慣性，即不能迅速對(duì)短路電流進(jìn)行反應(yīng)，而這個(gè)熱慣性也是合乎要求的，因?yàn)樵陔妱?dòng)機(jī)起動(dòng)或短時(shí)間過(guò)載時(shí)，熱繼電器不會(huì)動(dòng)作，避免了電動(dòng)機(jī)的不必要停車。
過(guò)載保護(hù)。逆變器輸出電流超過(guò)額定值，且持續(xù)通達(dá)規(guī)定的時(shí)間以上，為了防止逆變器期間、線路等損壞要停止運(yùn)轉(zhuǎn)。恰當(dāng)?shù)谋Ｗo(hù)需要反時(shí)限特性，采用熱繼電器或者電子熱保護(hù)（使用電子電路）。過(guò)負(fù)載是由于負(fù)載的GD（慣性）過(guò)大或因負(fù)載過(guò)大使電機(jī)堵轉(zhuǎn)而產(chǎn)生的。
瞬時(shí)過(guò)電流保護(hù)。由于逆變器負(fù)載側(cè)短路等，流過(guò)逆變器器件的電流達(dá)到異常值（超過(guò)容許值）時(shí)，瞬時(shí)停止逆變器運(yùn)轉(zhuǎn)，切斷電流。變流器的輸出電流達(dá)到異常值，也同樣停止逆變器運(yùn)轉(zhuǎn)。
Fu Zhou ZhuoKai Electric Co., Ltd.
公司簡(jiǎn)稱：卓凱電子
公司地址：福州市臺(tái)江區(qū)金融街萬(wàn)達(dá)廣場(chǎng)二期A2#寫字樓11層12室
公司聯(lián)絡(luò)人：李工(銷售工程師)
Tel：0591-62182520
Fax：0591-62032566
Phone：13696852881
商務(wù)QQ：1273632994
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800FMX01L
854K-24BF7
800FMSB32MQ20
800HJR4KC1JEXX
800T-J20KQ7B
800FMMT44MX02
1791ESIB16
802T-A5PU
800FPF4
889DS-F4HC-15
2090CPBM7DF10AA09
20BD065A3AYNAND0
592-COV169
855PC-B20ME522
1794IA8I
800T-J4604KC1NGXX
440RD23171
800FMKM2329R
800H-JR5KE7LLXX
4014674768
800HW136J
4RC252
25BE3P0N104
800HW526X
800T-FXJT6A5
2711T5A5L1
140MK8PD15
440RS07283
889D-F4AB-2
800HNP46A
190SAND2CA40C
700HLS11Z24
440TMDALE10AABD
440TMDBSE17MANA
598PM2211
100K05B10
2094BL10S
700RTC20020U1
440TMDALE10WAWB
1492SP1D300
800HL-JP5KA1AAXX
440PCDPB03B
440KA33084
1485PP1E4B4N5
800T-J17KB7ANXX
MPM-B1151T-SJ72AA
440TMDBLE170X0Y
440TMDBLE14JAKA
700S-P220A1
1489AACL318
1326ABB720EM2K7LS
509BJD
4983DD06
800HW062J
800TC-PTH26W
889AS-M65SP61
140GJ2F3C90
1485GP20D5C
4100CCF3
889N-F4AFN2XM-6N
440FECNNU01830
700-N400A24
193ERR
800FAE4CE137
280PWRM24CM015
800H8HX4T
800F-ALF6
855XH-BND30A
800FPCB2U276
800HNP11KK4AAXX
800FAFCU3CE267
800H-1HJ7
440TMDALE10CHCI
100C43L00
592EC3PC
453784
800FD-F3X02
440KMT55025
440TMDCLE10PGPH
802T-DTP1
800HNX14A
800H5HA4
800H-2HXR7P
6124212A
800T-PC316BGXG
20DR248A0NNNACGNE
440TMDALE10LELF
800HLHP2KB6NXXX
800FPLSR26N
800HL-JP91KB7CXXX
800HW151L
R7KJS-P2MPA2-F4
800T-KD2ADEX
753901SF
800H2HXMY7
800TC-A5AV
800T-FXTQ10R
1585DM4HBDM5
6122611V
440TMDBLE11IAIA
70181510K
140GM5H4D63
837-A2JX140
800HYH45
440FM1018CYNN
20BC043A0AYNANA0
20P21AD4P1RA0NNN
SK-R1-MCB1-PF755
889D-F4EC-5
