所以在交流异步电机里有个关键的参数是转差率就是转子与定子的速度差的比率。对应交流同步和异步电机变频器就有相映的同步变频器和异步变频器,伺服电机也有交流同步伺服和交流异步伺服,当然变频器里交流异步变频常见,伺服则交流同步伺服常见。应用由于变频器和伺服在性能和功能上的不同,所以应用也不大相同:在速度控制和力矩控制的场合要求不是很高的一般用变频器,也有在上位加位置反馈信号构成闭环用变频进行位置控制的,精度和响应都不高。
RO反渗透膜孔径小至纳米级(1纳米=1-9米),在一定的压力下,H2O分子可以通过RO膜,而源水中的无机盐、重金属离子、有机物、胶体、细菌、病毒等杂质无法通过RO膜,从而使可以透过的纯水和无法透过的浓缩水严格区分开来。RO膜过滤后的纯水电导率5s/cm,符合实验室三级用水标准。再经过原子级离子交换柱循环过滤,出水电阻率可以达到18.2M.cm,超过实验室一级用水标准(GB68292)。反渗透基本原理当纯水和盐水被理想半透膜隔开,理想半透膜只允许水通过而阻止盐通过,此时膜纯水侧的水会自发地通过半透膜流入盐水一侧,这种现象称为渗透,若在膜的盐水侧施加压力,那么水的自发流动将受到而减慢,当施加的压力达到某一数值时,水通过膜的净流量等于零,这个压力称为渗透压力,当施加在膜盐水侧的压力大于渗透压力时,水的流向就会逆转,此时,盐水中的水将流入纯水侧,上述现象就是水的反渗透(RO)处理的基本原理。
不要带电插拔各种控制板和插头。因为在加电情况下,插拔控制板会产生较强的感应电动势,这时瞬间反击电压很高,很容易损坏相应的控制板和插头。检修时不要盲目乱敲乱碰,以免扩大故障,越修越坏。侧装式磁翻板液位计拆卸、调整仪表时,应记录原来的位置,以便复原。修理精密仪器仪表时,如不慎将小零件弹飞可采取磁铁扫描和视线扫描方法进行寻找。造成磁翻板液位计出现假液位的原因有以下几种:1.液位计内部的波导丝故障,如松动、密封不好进水锈蚀等,造成信号失真;2.波导丝安装不正确,信号传递失真;3.外界干扰信号过大,造成电路得到的是假的信号,不是实际测量的信号;4.信号处理电路故障。
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