源 : mepca工程
VACON英国 – 使用变速驱动器 (变速驱动) 是节约能源的好方法，但, 如果你的变速驱动器是五年以上的老, 是时候再看看他们, 斯蒂芬说，塔哈尔, 交流变频调速传动专家的董事总经理, VACON英国.
在过去十年中, 技术新闻一直充斥着关于节约能源，可以通过拟合变速驱动作的故事. 这些故事是真实的, 这就是为什么许多公司已经安装了变速驱动. 当工程师们在这些企业看到了VSD节能故事, 他们可能认为他们一直在那里，做了, 但他们坐在后面，享受出色地完成工作焕发合理? 这取决于他们的变速驱动的时代. 如果他们只是在几年的老, 这是不可能的，需要进一步采取行动. 但是，如果变速驱动超过五岁, 这是一个不同的故事.
That’s because the intrinsic efficiency of VSDs has improved considerably in recent years. It’s not, 但, as simple as saying that VSD efficiency has improved by one or two per cent over the full operating range, because the efficiency improvements relate mostly to operation at reduced loads and speeds.
The efficiency of older drives running at less than 50% load can be surprisingly low – many small drives over five years old struggle to reach 60% efficiency at 40% load. The larger drives of the era fare somewhat better, but even with them, 80% efficiency at 40% load would have been considered satisfactory. In contrast, the latest ac VSDs deliver at least 90% efficiency down to 20% of full load.
But does this extra efficiency matter? After all, the gains are biggest when the drives are lightly loaded, and how often does that happen? In many applications, the answer is that the drives run lightly loaded most of the time.
Designers size motors for worst-case conditions – with an air-conditioning installation, 例如, this would be the hottest day of the year. Then they further increase the motor size “to be on the safe side”. This means most fan and pump motors rarely need to deliver full output. Instead, they spend their lives running lightly loaded, which is the least efficient area of operation for older VSDs. This is a very good reason to review the efficiency of older VSDs and, if necessary, replace them with modern products.
And it’s not only efficiency that will be improved by installing new drives. The latest units are much more reliable and, in today’s de-skilled world, this is a very real advantage. 此外, modern VSDs have superior harmonic and EMC performance, making it easier for users to satisfy the demands of the supply authorities.
There’s no doubt that, in appropriate applications, VSDs deliver big energy savings but older VSDs aren’t a “fit-and-forget” solution. They probably did a great job in their day, but it’s likely that they are now markedly inferior to the latest products. In short, if your VSDs have passed their fifth birthday, it’s time to talk to an expert like Vacon about reviewing their performance. You may be pleasantly surprised at the savings you could make!
源 : mepca工程