140DAI45300 使用日久的三相異步電動(dòng)機(jī)，常因電動(dòng)機(jī)定子繞組引出線頭上標(biāo)記號(hào)模糊不清或遺失，而造成定子三相繞組引出線的首尾端頭混亂。因此，往往由于定子繞組一相反接而引起電動(dòng)機(jī)損壞的嚴(yán)重事故。所以，簡(jiǎn)捷而準(zhǔn)確地辨別出電動(dòng)機(jī)定子三相繞組引出線的首尾端頭是非常重要的。
利用萬(wàn)用表的毫安擋可以快速準(zhǔn)確地辨別出電動(dòng)機(jī)定子三相繞組的首尾端。
用萬(wàn)用表判別電動(dòng)機(jī)繞組的首尾端的電路如圖11-13所示。
圖11-13
操作方法
此法所測(cè)試的電動(dòng)機(jī)轉(zhuǎn)子必須有剩磁，即必須是運(yùn)轉(zhuǎn)過(guò)的或通過(guò)電流的電動(dòng)機(jī)。
首先，用萬(wàn)用表電阻擋找出被測(cè)電動(dòng)機(jī)定子各相繞組的兩根線端，電阻值最小兩線端為同相繞組，并給各端頭做好編號(hào)。
任意選定三相繞組的首尾，并聯(lián)起來(lái)接到萬(wàn)用表的毫安擋上。這時(shí)慢慢勻速轉(zhuǎn)動(dòng)電動(dòng)機(jī)轉(zhuǎn)子，看萬(wàn)用表指針擺動(dòng)情況。如果萬(wàn)用表指針向左右擺動(dòng)明顯，說(shuō)明有一相繞組的首尾與其他兩相繞組的首尾相反，如圖11-13（a）所示。任意調(diào)換其中一相繞組線端頭的位置，再用上述同樣的方法測(cè)試。一相一相分別對(duì)調(diào)，看萬(wàn)用表指針擺動(dòng)的情況，直至萬(wàn)用表指針無(wú)明顯擺動(dòng)為止，如圖11-13（b）所示。此時(shí)接在一起的三個(gè)線頭就是被測(cè)電動(dòng)機(jī)定子繞組的三個(gè)首端或尾端。
140DAI45300
1794-IV16
1794-IV32
1794-LBL
1794-N2
1794-NM1
1794-OA16
1794-OA8
1794-OA8I
1794-OB16
1794-OB16D
1794-OB16P
1794-OB16PXT
1794-OB32P
1794-OB8
1794-OB8EP
1794-OB8EPXT
1794-OC16
1794-OE12
1794-OE4
1794-OE4XT
1794-OE8H
1794-OF4I
1794-OF4IXT
1794-OF8IH
1794-OG16
1794-OM16
1794-OM8
1794-OV16
1794-OV16P
1794-OV32
1794-OW8
1794-OW8XT
1794-PS13
1794-PS3
1794-TB2
1794-TB3
1794-TB32
1794-TB32S
1794-TB37DS
1794-TB3G
1794-TB3GK
1794-TB3GS
1794-TB3GSK
1794-TB3K
1794-TB3S
1794-TB3SK
1794-TB3T
1794-TB3TK
1794-TB3TS
1794-TB3TSK
1794-TB62DS
1794-TBKD
1794-TBN
1794-TBNF
1794-TBNK
1794-VHSC
1762-IA8
1762-IF2OF2
1762-IF4
1762-IQ16
1762-IQ32T
1762-IQ8
1762-IQ8OW6
1762-IR4
1762-IT4
1762-L24AWA
1762-L24AWAR
1762-L24BWA
1762-L24BWAR
1762-L24BXB
1762-L24BXBR
1762-L40AWA
1762-L40AWAR
1762-L40BWA
1762-L40BWAR
1762-L40BXB
1762-L40BXBR
1762-MM1
1762-MM1RTC
1762-OA8
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