3.結(jié)束語(yǔ)
理論上的分析可以證實(shí)，該計(jì)劃思路是完全合理的。實(shí)踐中，變頻器選用直流制動(dòng)并配適合當(dāng)?shù)闹绷髦苿?dòng)時(shí)間，初步頻率和制動(dòng)準(zhǔn)位所發(fā)作的電機(jī)剎車(chē)作用也比照明顯。
選擇精確的變頻器制動(dòng)電阻是保證制動(dòng)作用并避免設(shè)備損壞的必要條件：
首要要計(jì)算制動(dòng)功率并制造精確的制動(dòng)曲線(xiàn)；再根據(jù)制動(dòng)曲線(xiàn)判定制動(dòng)周期及制動(dòng)功率；根據(jù)所判定的制動(dòng)功率及制動(dòng)周期，一同參看電壓、阻值等條件選擇適合的制動(dòng)電阻；所選制動(dòng)電阻阻值不能小于選型手冊(cè)中規(guī)矩的數(shù)值，否則將直接構(gòu)成變頻器損壞！這在電阻選型時(shí)應(yīng)予以說(shuō)明。
有時(shí)候制動(dòng)功率欠好判定，或?yàn)榱吮ＷC安全，可選擇制動(dòng)功率較大的電阻；西門(mén)子標(biāo)準(zhǔn)傳動(dòng)產(chǎn)品供給的MM4系列制動(dòng)電阻均為5％制動(dòng)周期的電阻，所以在選型時(shí)應(yīng)加以留心；制動(dòng)周期在參數(shù)P1237中選擇；一同應(yīng)將P1240設(shè)置為0用以禁止直流電壓控制器。
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