Tech Blog

What's the difference between open loop control and closed loop control? Simple, it's like driving a car. When you are driving your car, you give the car more gas to go up a hill, and less gas when going down a hill. In this example, you are changing the amount of gas that is propelling the car up or down the hill. This example can be applied to open loop control in blowers. When you add resistance to the blower it will work to 100% of the voltage provided. In other words, it will max out the current Limit to provide 100%...

When it comes to selecting the right motor for your fume evacuation system, there are three main points to consider: Operating Environment, Performance Targets and Life Expectations. Without consideration of these key areas, even the best motor won’t meet your needs effectively. Let’s look at how you should think about each one and how they can impact your results.  Operating Environment  Operating environment is a critical piece of the equation because it forces you to consider where your motor is going, what kind of air you are trying to move, how you want to power it and how much room you have for it.   The first thing to keep in mind about the operating environment is the...

Blower performance depends on dozens of electromagnetic and geometric design features. Stack-up of tolerances heightens blower-to-blower performance disparities — even between those supposedly made of identical parts. Final calibration minimizes such output variation, but slight deviations always persist. This is why mechanical efficiency plots serve as guidelines on capability ranges — and why feedback and blower controls that compensate for specific motors and installation conditions are so useful. After all, most geometrical blower tolerances aren’t of direct concern to OEMs and design engineers looking to apply blower. Rather, designers are more focused on the overall airflow of a given blower...

Engineers selecting a blower for a given installation must have detailed knowledge (or at least estimates) of the application’s operating point as well as a plot of the system’s resistance curve; the prospective blower performance in response to speed changes; static and velocity pressure; and required blower life. Consider the first parameter. A blower-system operating point is defined as the intersection of the blower’s performance curve with the installation resistance curve — both plotted on pressure-CFM chart. Therefore, the operating point of a blower depends on two factors: 1) Required CFM flow rate 2) A pressure-change value called head loss...

The innovative design and enhancements of the Windjammer Pro provide increased performance over competitive models. One key feature is the ability to apply multiple performance profiles depending on the application requirement. New to the feature list, “common performance” provides the ability to have the same air performance whether operating at 120 or 240 vac. This is great for OEM products designed for the global market. This model provides 17% greater flow compared to other manufacturers. The Windjammer Pro operates at a lower temperature to extend the life of the brushless motor. Improved motor cooling along with shaft and bearing assembly...