某紡織廠的空調(diào)采用的是雙速電機(jī)進(jìn)行調(diào)速,如果能改用變頻器進(jìn)行無級調(diào)速,則可更好地進(jìn)行量調(diào)節(jié),按車間余熱量進(jìn)行送風(fēng)。同步電動機(jī)調(diào)速,可通過改變電源頻率和電極對數(shù)來實現(xiàn);異步電動機(jī)調(diào)速通過改變電源頻率、電機(jī)對數(shù)和轉(zhuǎn)差率方法來實現(xiàn)。
變頻調(diào)速是改變供電的頻率,從而改變電動機(jī)轉(zhuǎn)速的調(diào)速方法,它基本保持了異步電動機(jī)固有的特性,即硬度高和轉(zhuǎn)速差小的特點,所以變頻調(diào)速法具有效率高、調(diào)速范圍寬、精度高和調(diào)速平滑等優(yōu)點。
變頻調(diào)速分電壓變頻調(diào)速、電流變頻調(diào)速和脈寬調(diào)制(PWM)型變頻調(diào)速三種類型。
交流電源經(jīng)二級管組成的橋式整流和電容濾波后,成為恒定的直流電壓,加之由大功率晶體管構(gòu)成PWF型變頻器,使控制電路按一定規(guī)律控制PWM逆變器的各個晶體管的通和斷,從而在逆變器輸出端獲得一組等幅而不等寬的矩形脈沖波。
新聞:深圳貼合機(jī)專用步進(jìn)電機(jī)HSTM57-1.8-S-51-6-3銷售中心
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