- Brushed ac and dc motors that come in the form of PMDC motors, shunt-wound motors, series-wound motors (also called universal motors), and compound-wound motors. These motors are cost effective and simple to control — so are particularly common in blender, grinder, and home-appliance applications.
- Switched-reluctance motors. These blower motors are most common in HVAC blowers, vacuum and cleaning appliances, and industrial material-handling applications that need clean and reliable blower operation.
- Brushless motors that incorporate permanent magnets — also called EC motors for the way in which they’re electronically commutated. These blower motors excel where designs need high efficiency, long life, and airflow adjustability — to optimize turn down for top blower performance, for example. Brushless blower motors first became common in transportation applications — those fans, pumps, and motors on heavy-duty transports and other commercial vehicles. Now they’re finding use in food and beverage, business-machine, and even medical designs.
- Induction motors — or (in the context of blowers in particular) often called by the more playful squirrel-cage motors (to avoid confusion with inducer-blower products). In fact, these motors are the most common used in blowers today, as they excel in high-horsepower blower and cooling-fan applications.
Turndown is the operating range of a blower or blower system — an expression of its ability to reduce airflow rate. Most often it’s expressed as a ratio of the blower’s minimum airflow to its maximum. Sometimes it’s calculated as the difference between maximum and minimum airflow rates, then divided by maximum airflow rate.
5. Regenerative blowers are for very specific applications. Recall that in regenerative blowers (unlike centrifugal blowers) the fluid inlet is parallel to the outlet with both perpendicular to impeller rotation. Vanes push air along arcs parallel to the blower-body circumference — even as centrifugal forces push air between impeller vanes outward. Airflow then progresses to the next vane’s root for more re-circulation — ultimately for a spiral airflow path subject.
6. Mufflers, valves, and diverters are core to blower system design. Rather than afterthoughts, these subcomponents are essential and often quite sophisticated. Just consider diverter valves that can automatically change piping from suction to pressure (and vice versa) to impart blower versatility. They’re especially useful for replacing two blowers with one on installations having intricate piping — as in vacuum-based material and part handling, air tables, and pneumatic tube systems.t to constant acceleration (and pressure buildup). That’s why regenerative blowers aren’t suitable for most material handling, air knife, furnace, or other high-velocity blower applications ... but excel where installations benefit from extra pressure to overcome constricted or convoluted paths.
Information provided by Ametek DFS