描述

對(duì)于各種步進(jìn)電機(jī)而言，內(nèi)部都是由鐵芯和繞組線圈組成的。繞組有電阻，通電會(huì)產(chǎn)生損耗，損耗大小與電阻和電流的平方成正比，這就是我們常說(shuō)的銅損，如果電流不是標(biāo)準(zhǔn)的直流或正弦波，還會(huì)產(chǎn)生諧波損耗;鐵心有磁滯渦流效應(yīng)，在交變磁場(chǎng)中也會(huì)產(chǎn)生損耗，其大小與材料，電流，頻率，電壓有關(guān)，這叫鐵損。銅損和鐵損都會(huì)以發(fā)熱的形式表現(xiàn)出來(lái)，從而影響電機(jī)的效率。步進(jìn)電機(jī)一般追求定位精度和力矩輸出，效率比較低，電流一般比較大，且諧波成分高，電流交變的頻率也隨轉(zhuǎn)速而變化，因而步進(jìn)電機(jī)普遍存在發(fā)熱情況，且情況比一般交流電機(jī)嚴(yán)重。

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