描述

1769-PA4

交流變頻調(diào)速之所以比直流調(diào)速廣泛運(yùn)用是因?yàn)榻涣麟姍C(jī)，不是變頻調(diào)速原理具有優(yōu)越性，變頻調(diào)速只能應(yīng)用于調(diào)速，而對力矩是無法做到精確控制的，原因很簡單，直流調(diào)速的電樞和勵磁不是耦合的，是分開的，這樣對電樞電流和勵磁電流能夠做到精確控制。而交流調(diào)速，電樞電流和勵磁電流是耦合的，是無法做到精確控制的，盡管目前的變頻調(diào)速具有矢量控制，也就是運(yùn)用現(xiàn)代控制理論，通過矢量轉(zhuǎn)換，將交流電機(jī)中耦合的電樞電流和勵磁電流解開，從而對其進(jìn)行控制，也就是仿真直流調(diào)速的原理。但是要做到直流調(diào)速的控制特性目前是很困難的。因此在軋機(jī)、造紙等對力矩要求很高行業(yè)，直流調(diào)速還是具有廣泛性。而僅對速度控制，目前變頻調(diào)速是可以逼真直流調(diào)速的特性，因?yàn)榻涣麟姍C(jī)的優(yōu)越性是直流電機(jī)無法做到的。
直流電機(jī)的電刷和體積的原因，限制了它的應(yīng)用范圍，變頻調(diào)速可以說是由風(fēng)機(jī)和水泵發(fā)展而來的，是由于風(fēng)機(jī)和水泵節(jié)能的需要，變頻調(diào)速是最佳選擇，不過我個(gè)人認(rèn)為就目前電價(jià)和變頻器的自身的價(jià)格相比，這種節(jié)能是毫無意義的，因?yàn)橐炎冾l器的投資收回，最少需要5-6年，在這5-6年的時(shí)間里，工況還不知道要發(fā)生什么變化。因此，變頻器最好應(yīng)用在需要調(diào)速，而對啟動性能及力矩調(diào)節(jié)要求不是很苛刻的場合，而這種場合比比皆是，這才是變頻調(diào)速普遍應(yīng)用的原因。因此可以說如果用直流調(diào)速控制器去控制交流電機(jī)那才是最好的，真能做到這一點(diǎn)，目前還很困難。

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1769-PA4

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