MPL-B540D-MJ72AA

可以理解為，起動(dòng)時(shí)轉(zhuǎn)子感生電流的磁場(chǎng)與定子磁場(chǎng)的夾角太小。只有達(dá)到90°時(shí)力矩大，但整個(gè)過程都不可達(dá)到90°，只是逐步向90°靠近。

如果不改變轉(zhuǎn)子線圈材料和線槽尺寸，只是改變?cè)褦?shù)和線經(jīng)，那理論上不能改變線圈的電阻與電抗比。比如把1匝擴(kuò)為10匝，則電阻電抗都擴(kuò)大到100倍，感生電壓擴(kuò)大到10倍。

但如果把單匝改多匝，再將線頭引出，串聯(lián)上的電阻，就可以改變阻抗比，使起動(dòng)電流比鼠籠式低，而起動(dòng)力矩比鼠籠式大。并且調(diào)節(jié)這個(gè)串聯(lián)電阻時(shí)，可以改變電機(jī)的起動(dòng)和運(yùn)行性能，這就是繞線轉(zhuǎn)子異步電機(jī)的原理。這種電機(jī)多用于難起動(dòng)機(jī)械部位。

由于半導(dǎo)體技術(shù)的進(jìn)步，整流和交流逆變技術(shù)成熟了?，F(xiàn)在變頻器的出現(xiàn)，能任意調(diào)節(jié)起動(dòng)頻率，使得鼠籠式電動(dòng)也可以代替繞線式了。

繞線型異步電動(dòng)機(jī)的優(yōu)點(diǎn)是結(jié)構(gòu)簡(jiǎn)單、可靠性高、制造成本低。它們廣泛應(yīng)用于家用電器、工業(yè)設(shè)備以及交通運(yùn)輸?shù)阮I(lǐng)域。

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