A20B-2001-0510現(xiàn)貨;
A20B-2001-0510供應(yīng)。
變頻電源主要用于對(duì)進(jìn)出口電器產(chǎn)品的用電檢測(cè)、調(diào)試,及用于精密儀器的供電,廣泛適用于家電制造業(yè)、電子制造業(yè)、IT產(chǎn)業(yè)、電腦設(shè)備等。但是變頻電源的安裝使用會(huì)對(duì)其他系統(tǒng)設(shè)備產(chǎn)生影響,有時(shí)甚至?xí)?dǎo)致其他設(shè)備故障。它的具體影響在哪里?需要采取哪些防范措施?
關(guān)于電源高次諧波問題。阿木介紹,由于目前的變頻電源幾乎都采用PWM(脈沖寬度調(diào)制)控制方式,這樣的調(diào)制方式使得變頻電源運(yùn)行時(shí),在電源側(cè)產(chǎn)生高次諧波電流,并造成電壓波形畸變,會(huì)對(duì)電源系統(tǒng)產(chǎn)生嚴(yán)重影響。
我們建議,可以采用以下方式進(jìn)行預(yù)防:采用專用變壓器對(duì)變頻電源供電,與其他供電系統(tǒng)分離;在變頻電源輸入側(cè)加裝濾波電抗器或多條整流橋回路,降低高次諧波分量。對(duì)于有進(jìn)相電容器的場(chǎng)合,因高次諧波電流將電容電流增加造成發(fā)熱嚴(yán)重,必須在電容前串接電抗器,以減小諧波分量,并對(duì)電抗器的電感應(yīng)合理分析計(jì)算,避免形成電感電容振蕩。
關(guān)于電機(jī)溫度過高及運(yùn)行范圍的問題。阿木指出,現(xiàn)在有些企業(yè)對(duì)現(xiàn)有電機(jī)進(jìn)行變頻調(diào)速改造時(shí),由于自冷電機(jī)在低速運(yùn)行時(shí)冷卻能力下降,會(huì)造成電機(jī)過熱。此外,變頻電源輸出波形中所含有的高次諧波會(huì)增加電機(jī)的鐵損和銅損,因此在確認(rèn)電機(jī)的負(fù)載狀態(tài)和運(yùn)行范圍之后,建議采取以下措施解決:對(duì)電機(jī)進(jìn)行強(qiáng)冷通風(fēng)或提高電機(jī)規(guī)格等級(jí);使用變頻專用電機(jī);限定運(yùn)行范圍,避開低速區(qū)。
關(guān)于高頻開關(guān)形成的尖峰電壓對(duì)電機(jī)絕緣的影響。在變頻電源的輸出電壓中,含有高頻尖峰浪涌電壓。這些高次諧波沖擊電壓將會(huì)降低電機(jī)繞組的絕緣強(qiáng)度,尤其以PWM控制型變頻電源更為明顯??梢圆扇∫韵麓胧罕M量縮短變頻電源到電機(jī)的配線距離;利用阻斷二極管對(duì)浪涌電壓的吸收電路,對(duì)變頻電源輸出電壓進(jìn)行處理;對(duì)PWM型變頻電源,應(yīng)盡量在電機(jī)輸入側(cè)加濾波器。
11) 非淡泊無以明志,非寧?kù)o無以致遠(yuǎn)。(諸葛亮《誡子書》)
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