Closed loop without a feedback device?

摘要

More than simply rotating a motor, the variable speed drive has long been recognised as a critical piece of most modern machinery. It offers a gateway into the machine, capable of significantly increasing the performance of the machine as well as offering sophisticated monitoring of the process, e.g. highlighting the onset of mechanical problems that could be the source of unscheduled downtime. There are a variety of features offered by the manufacturers, which is worth looking at more closely to understand which would be most advantageous for them to use.