1395-A76-D5-P10-P51現(xiàn)貨;
1395-A76-D5-P10-P51供應(yīng)。
三相交流電機的結(jié)構(gòu)簡單、運行可靠、價格低廉,在冶金、建材、礦山、化工、紡織、橡膠、機械等工業(yè)領(lǐng)域發(fā)揮著巨大作用。三相電機調(diào)速系統(tǒng)的種類很多,但效率、性能、應(yīng)用廣的是變頻調(diào)速,它可以構(gòu)成高動態(tài)性能的交流調(diào)速系統(tǒng)來取代直流調(diào)速系統(tǒng)。變頻調(diào)速是以變頻器向交流電機供電,實現(xiàn)對交流電機的寬范圍內(nèi)無級調(diào)速。變頻器可把固定電壓、固定頻率的交流電變換為可調(diào)電壓、可調(diào)頻率的交流電。變頻調(diào)速代替直流電機,能夠降低成本,提高運行的可靠性,變頻調(diào)速可使每臺電機節(jié)能30%-----70%,而且在恒轉(zhuǎn)矩條件下,能降低軸上的輸出功率,既提高了電機效率,又可獲得節(jié)能效果。
那么變頻器中應(yīng)用的PWM和PAM的不同點是什么?PWM是英文Pulse Width Modulation(脈沖寬度調(diào)制)縮寫,按一定規(guī)律改變脈沖列的脈沖寬度,以調(diào)節(jié)輸出量和波形的一種調(diào)值方式。PAM是英文PULSE Amplitude Modulation(脈沖幅度調(diào)制)縮寫,是按一定規(guī)律改變脈沖列的脈沖幅度,以調(diào)節(jié)輸出量值和波形的一種調(diào)制方式.
其次變頻器的電壓型與電流型有什么不同?變頻器的主電路大體上可分為兩類:電壓型是將電壓源的直流變換為交流的變頻器,直流回路的濾波是電容;電流型是將電流源的直流變換為交流的變頻器,其直流回路的濾波是電感。
然后變頻器的電壓與電流成比例的改變,異步電動機的轉(zhuǎn)矩是電機的磁通與轉(zhuǎn)子內(nèi)流過電流之間相互作用而產(chǎn)生的,在額定頻率下,如果電壓一定而只降低頻率,那么磁通就過大,磁回路飽和,嚴重時將燒毀電機。因此,頻率與電壓要成比例地改變,即改變頻率的同時控制變頻器輸出電壓,使電動機的磁通保持一定,避免弱磁和磁飽和現(xiàn)象的產(chǎn)生。
20) 寧為玉碎,不為瓦全。(《北齊書》)
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Xycom CPU XVME-688 P/N: 70688-011Xycom 112595-001 8000-SKM PC Board
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WELLER PU 81 / WS-81 soldering iron Cooper tools GmbH?
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Xycom AIN XVME-560 70560-001
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L102810B Timken BearingFrom Canada
387W3 TIMKEN New BearingsSiemens Simatic S5 6ES5-451-4UA12 6ES5451-4UA12 V.02
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MURR Netzfilter 10373 3 x 440V 4x25ASiemens Simatic S5 6ES5441-8MA11 6ES5 441-8MA11 V.03
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