Not Your Grandfather's Brushed Vacuum Blowers ... Anymore

When it comes to the commercial market, brushed motors have been a staple in the industry for years. Whether for scrubbers, extractors or central vacuum systems, these motors are considered critical because of their durability and dependability.

Thanks to cutting-edge technologies and ongoing research, brushed vacuum motors have evolved and aren't the same blowers your grandfather used to use long ago.

Over the last 30 years, they have become smaller, lighter, and faster. Additionally, there has been a significant improvement in the quality of components. Bearings can now reach 50,000 to 70,000 RPMs, while commutators, brushes, and fans are capable of taking on higher speeds and lasting a normal lifetime.

What are Brushed Vacuum Motors?

Brushed vacuum motors are based on a universal motor design, which uses a wound rotor and stator in series with one another. Universal motors are most commonly found in smaller, corded appliances. They have high speed and good starting capability.

Their speed-torque characteristics make them ideal for driving fan loads. They speed up as load decreases and partly compensate for clogging filters in vacuum cleaners. The workhorse of many applications, these motors have a high horsepower-per-pound ratio and are generally less expensive than their brushless counterparts.

How to Determine the Ideal Design for Brushed Vacuum Motors

Since there are a variety of brushed vacuum motors available — currently over 1,400 unique AMETEK DFS models — there are certain questions you should ask to determine the ideal design for your application.

Some of these questions include:

    • What type of air will be picked up? Do you need a motor that has to pick up dry or moist air?

    • What are the cooling requirements? Figure out whether external cooling will be necessary or if there is enough working air flow for cooling. 

    • What will the operating point be? What kind of airflow rate, pressure or suction, current draw or input power will be necessary?

    • What type of voltage do you need? Determine the available operating voltage. Will you need an alternating current (AC) or direct current (DC) motor?

    • What is the use case? Do you need a brushed motor for pressure or vacuum purposes?

    • What other features do you need? Does your application require thermal protection? Need serviceable brushes? Air discharge? (Tangential, peripheral or thru-flow?) Specific life?

In this blog, we’ve just scratched the surface about brushed motors. To learn more, simply, click here to read our whitepaper today!