External voltage controlled frequency function 外部電壓頻率控制功能vcf
Application of stationary compress control frequency converted regulating speed system for air compressor station 恒壓縮控制變頻調(diào)速系統(tǒng)在空氣壓縮機站的應(yīng)用
Change to departure control frequency 118 . 1 after airborne . caution for possible turbulence from the dc8 just departed 3 minutes ago 離地后換至118 . 1起飛管制頻率。注意, dc8剛起飛3分鐘,可能有顛簸。
This paper has introduced briefly a kind of simple practical method that uses the export interface of spindle of the sinumerik 802c numerical control system to control frequency converter 摘要簡要介紹了利用西門子802c數(shù)控系統(tǒng)的主軸輸出口控制變頻器的一種簡單實用的方法。
The interface utilizes the high - speed pu lse function of plc basic unit to realize the control frequency of pulse , pwm regulate voltage and to make use of drivers of step motor control step motor 利用plc主機模塊的高速脈沖輸出功能,控制脈沖頻率的發(fā)生、 pwm脈寬電壓的調(diào)節(jié),并通過步進(jìn)電機驅(qū)動器實現(xiàn)對步進(jìn)電機高效控制。
Some problems are solved in applying to produce . 1 ) to test piezoelectric wafer ' s saw transmission speed . use sorts of wafers having different speed during produce , controlling frequency consistency 在生產(chǎn)運用中,主要解決以下幾個問題: 1 )對壓電基片的saw傳播速度無損測量,在生產(chǎn)中對不同速度的晶片進(jìn)行分類使用,應(yīng)用于生產(chǎn)以便對頻率一致性進(jìn)行控制。
Following this conclusion , various kind of ac speed control rules have been analyzed with the favor given to the self - controlled frequency regulation drive . machine model for doubly fed power generation has been given and control equations are discussed 其次,借鑒各種交流調(diào)速方法,研究電機雙饋發(fā)電運行的模型和控制手段,采用自控式調(diào)頻,提出了繞線轉(zhuǎn)子雙饋發(fā)電機的矢量控制策略。
Constant stator magnetic linkage control frequency converter includes power devices utilizing igbt , drive circuit using three - phase drive ic with multiple protection functions . pwm signal formation circuit in the way of voltage space vector control and realized with pld ( programmable logic device ) devices and compensation for the influence of supply voltage variation and stator resistance voltage drop 其中,恒定子磁鏈控制變頻器的設(shè)計中主電路采用功率器件igbt ;驅(qū)動電路采用三相多功能集成驅(qū)動芯片; pwm脈寬調(diào)制信號產(chǎn)生電路采用電壓空間矢量控制方式,由pld器件實現(xiàn);對電源電壓變化及電阻壓降造成的影響進(jìn)行了補償。
With the conduction property of the triggered thyristor and the intellective numerical controlled frequency reduction of the triggering pulse by mpu , we can divide alternating current into several complete sinusoidal waves to supply some loads . it can be made as a controller or a pcb ware , which is suitable for the air conditioning , machine tool and various instruments that require electric power or rotate speed adjustment 利用晶閘管的觸發(fā)導(dǎo)通特性,用單片機對觸發(fā)信號進(jìn)行智能數(shù)字降頻,可在交流電中切分出部分完整的正弦波形供負(fù)載使用,可以單獨做成一臺控制儀器或者作為一個控制電路板用于需要電功率和轉(zhuǎn)速調(diào)節(jié)的空調(diào)、機床以及各類儀器設(shè)備中。