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可变频率驱动器:您需要知道什么

发表于经过雷竞技app

当涉及可变扭矩负载时,我们需要了解两件事:

  1. 当速度发生变化时,负载行为的方式
  2. 电动机负载的输出或输入 - 它令人惊讶地降低了可变扭矩驱动器(鼓风机,泵等)的输出/输入被堵塞或限制。

骗子论文为我们提供了这个反向直观行为的一个很好的例子:

“我曾经接到过电机用户的电话,他们在加热系统上烧掉了驾驶鼓风机的电机。电动机驱动鼓风机,该鼓风机通过过滤器向透过滤光器并将其送入管道的分布系统。When I asked if there had been any changes in the system he said, ‘Well, we extended the ducts into another room and cut the end off to let the air flow, but that would have made it easier for the motor not more difficult.’ When I told him that the opposite was true he couldn’t believe it. It defies good judgment to think that adding a restriction to the output of the blower would decrease the motor load.”

不同的负载类型

我们专注于恒定的扭矩和可变扭矩(尽管恒定的马力也是一种负载类型)。要了解差异,它只是依赖于速度是否依赖于速度。

恒定扭矩:定义驱动机器所需的扭矩量的负载保持恒定 - 易于无关的速度。

可变扭矩:随着速度的增加,需要低速时低速扭矩和增加扭矩。可变扭矩载荷包括大量的电机要求,使得智能了解这些负载与恒定扭矩负载(这更直接)。

变量类型扭矩负荷包括:

  • 粉丝
  • 鼓风机
  • 离心泵

显然,风扇和鼓风机主要是移动空气。然而,离心泵可以移动不同类型的碳,如油,冷却剂,水等。

请记住:当负载降低时,电机加速。

这骗子论文gives us another way to look at it: “when the output of a centrifugal pump or a squirrel cage blower is flossed off the or fluid inside the housing becomes a ‘liquid flywheel.'” That means it just spins and spins around the vanes of blower or pump. The only energy needed is what it takes to make up for the friction losses because there is no new fluid entering that needs to be accelerated.

如果您对可变扭矩负载有疑问以及它们如何适用于您的业务,联系我们的专家

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