TDM1.2-050-300-W1-000/S108變頻調(diào)速控制注塑機(jī)(電液混合型) 此種方案采用了VFD B/V開/閉環(huán)矢量控制變頻器。將控制比例流量閥的電流信號(hào)同時(shí)輸入給變頻器的模擬量輸入端,通過控制油泵電機(jī)的轉(zhuǎn)速,油泵的實(shí)際流量正比于電機(jī)的轉(zhuǎn)速,油泵的輸出功率因此也正比于電機(jī)的轉(zhuǎn)速,起到了節(jié)能的目的。根據(jù)塑料制品和工藝要求的不同,其整體節(jié)能效果從30%至60%的范圍內(nèi)不等。 2、 全電動(dòng)注塑機(jī) 全電動(dòng)注塑機(jī)方案是在變頻調(diào)速的思路上,將鎖模、落料、注射等機(jī)構(gòu)都采用臺(tái)達(dá)伺服系統(tǒng),關(guān)鍵移動(dòng)部位是用了上銀滾珠絲杠和直線導(dǎo)軌以減小系統(tǒng)損耗,使用臺(tái)達(dá)PLC來(lái)分配控制順序指令,通過HITECH人機(jī)來(lái)進(jìn)行人性化中央控制,從而徹底拋棄了液壓系統(tǒng),使傳統(tǒng)注塑機(jī)的油污染問題得到TDM1.2-050-300-W1-000/S108根本解決,而整機(jī)的效率也隨著伺服電機(jī)、滾珠絲杠和直線導(dǎo)軌的使用而得到了全面的提高,并且產(chǎn)品的精度都得到了有效保證。目前由于成本問題和控制系統(tǒng)的相對(duì)復(fù)雜,市場(chǎng)上并沒有普遍接受。但在使用情況要求比較高的情況下,優(yōu)勢(shì)很明顯。 其它節(jié)能塑機(jī)控制方案還有使用變量泵等,在此不多敘述,以下我們著重討論變頻調(diào)速控制塑機(jī)的原理 三、變頻調(diào)速節(jié)能塑機(jī)方案簡(jiǎn)敘 變頻調(diào)速節(jié)能塑機(jī)有可分為如下: 采用不加編碼起反饋的開環(huán)通用VVVF方式變頻器,臺(tái)達(dá)VFD_F/B系列; 采用編碼器速度反饋的閉環(huán)泛用矢量變頻器,臺(tái)達(dá)VFD_B+PG系列; 采用編碼器速度反饋的閉環(huán)純矢量控制變頻器,臺(tái)達(dá)VFD_V+PG系列。 方案1、不加編碼器反饋的開環(huán)通用VVVF方式 普通的VVVF(變壓變頻調(diào)速)調(diào)速方式,即使用正弦波PWM控制,由于是沒有速度反饋的開環(huán)控制,變頻器不能根據(jù)電機(jī)的實(shí)際轉(zhuǎn)速和理論轉(zhuǎn)速的偏差值來(lái)進(jìn)行補(bǔ)償。而我們知道,在外部負(fù)載發(fā)生變化時(shí),電機(jī)的轉(zhuǎn)差率也會(huì)隨之變化,從而速度產(chǎn)生偏差,這樣必然致使油泵提供的油量與需求值發(fā)生偏差。另外,由于空間矢量PWM控制變頻器在低頻率(5HZ以下)的扭矩輸出不夠理想,導(dǎo)致注塑機(jī)的低速保壓和響應(yīng)速度能力都不盡人意,也就影響的產(chǎn)品質(zhì)量和工作效率,從而失去的節(jié)能的意義。 方案2、帶編碼器速度反饋的閉環(huán)泛用矢量控制 區(qū)別于1點(diǎn),由于加了編碼器,當(dāng)負(fù)載產(chǎn)生波動(dòng),TDM1.2-050-300-W1-000/S108變頻器控制部分可迅速計(jì)算出實(shí)際轉(zhuǎn)差頻率,從而給出定子精確的旋轉(zhuǎn)頻率,使電機(jī)轉(zhuǎn)速保持不變,提高了電機(jī)面對(duì)負(fù)載變化的運(yùn)行穩(wěn)定性。雖然使用的泛用矢量B系列變頻器,在1HZ可達(dá)150%額定轉(zhuǎn)矩,但并不能完全滿足注塑機(jī)系統(tǒng)的要求,并且B系列使用的是16位微處理器,因而,總體上系統(tǒng)的響應(yīng)速度并沒有得到徹底的提高。 方案3、帶編碼器速度反饋閉環(huán)純矢量控制 由于臺(tái)達(dá)V系列采用了32位微處理器,TDM1.2-050-300-W1-000/S108無(wú)感測(cè)器向量控制方式(定子電流相位是由內(nèi)部計(jì)算得出),這種方式相比2方案,可使電機(jī)在低速運(yùn)行時(shí)有更大的轉(zhuǎn)矩(0.5HZ可達(dá) 150%以上的啟動(dòng)轉(zhuǎn)矩),相同壓力和流量下相對(duì)電流小,響應(yīng)性能有了極大的提高,從而整臺(tái)注塑機(jī)的工作效率得到了保障。
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