2)在變頻器的輸出端安裝dv/dt濾波器:這個措施適用于電纜長度小于300米的場合,價(jià)格略高于電抗器,但是效果有了明顯的改善,如圖6(d)所示。
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3)在變頻器的輸出端安裝正弦波濾波器:這個措施是*理想的。因?yàn)樵谶@里,將PWM脈沖電壓變成了正弦波電壓,是電機(jī)工作在與工頻電壓相同的條件下,尖峰電壓的問題得到了徹底的解決(電纜再長,也不會出現(xiàn)尖峰電壓了)。
4)在電纜與電機(jī)接口的位置安裝尖峰電壓吸收器:前面幾個措施的缺點(diǎn)是當(dāng)電機(jī)的功率較大時,電抗器或?yàn)V波器的體積、重量很大,價(jià)格較高,另外,電抗器和濾波器都會導(dǎo)致一定的電壓降,影響電機(jī)的輸出力矩,采用變頻器尖峰電壓吸收器能夠克服這些缺點(diǎn)。航天科工集團(tuán)二院706所開發(fā)的SVA尖峰電壓吸收器,采用先進(jìn)的電力電子技術(shù)和智能控制技術(shù),是解決電機(jī)損傷的理想設(shè)備。另外,SVA尖峰吸收器還能保護(hù)電機(jī)的軸承。
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