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Variable frequency drives (VFDs), which are found in nearly every modern industrial facility, are used to control the speed of motors in many systems. VFDs play a role in pumps, conveyors, fans, compressors, and more. VFDs help save energy and can even extend equipment life by reducing mechanical wear and tear. Their role makes them an important part of many Canadian industries.
For every engine, generator, and or other electromechanical device, the path from initial concept to finished product is one that is long and arduous. And while considerable lead time is required to fulfill initial and subsequent orders, the design phase of product development is arguably much more intense and time consuming. In fact, it can take months and even years to determine all the relevant criteria that need to be addressed during the design phase.
No matter what the salesperson or spec sheet says, an HVAC system is only as good as the people who install and service them. Though it might sound hard to believe, the number of support calls logged to service HVAC equipment is on the rise and, in many cases, a common culprit can be identified: the variable speed drive.
While much of the world has at least heard the term “transistor” before, their function and importance aren’t exactly common knowledge. Knowledge of thyristors and their purpose is arguably even more vague and yet, both diminutive electrical components are integral to many of the electric-powered devices that are the backbone of our societies and economies.
Though they are not explicitly named for their widespread use, universal motors can, in fact, be found just about everywhere. Open any number of household appliances or industrial machines for example, and chances are you will find a universal motor at its core. But if they aren’t named for the seemingly “universal” applications to which they lend themselves, why are they named as such?
A stepper motor is an electromechanical device designed to convert electrical power into mechanical power. If you aren’t overly familiar with motors, it might be difficult to distinguish a stepper motor from another motor type and, more importantly, appreciate the role they play in industrial and manufacturing settings.
In this article we will be reviewing DC source conversion and understand how it can be useful when analyzing circuits. DC sources are mainly referred to as sources of constant voltages or currents. Hence, we can classify them into two types; DC Voltage Source and DC Current Source, where each source type representation includes an internal resistance “Rint” as illustrated in the figure below.