What Is a Compressor Duty Motor?

Takes a strong motor to compress this air.

Electric air compressors are machines that use electric motors to pressurize air for various kinds of work. The extremely high torque required for this process necessitates highly durable motors, motors strong enough for compressor duty, or "compressor duty" motors.

Basics

Compressor duty motors are sold as part of compressors or independently for use as replacements or non-compressor applications. What they have in common is high-quality material to ensure their durability. They are typically encased in industrial gauge rolled steel and use precision bearings.

Output Power

The output power of a compressor duty motor depends on two factors: horsepower and cycle rate. Compressor duty motors range from 2 hp to 7.5 hp and from 1,800 rotations per minute to 3,600 rpm.

Cost Variability

The prices of various compressor duty motors varies based on the manufacturer, the durability and the output capacity. A 2 hp with a light frame can cost less than $200 out of the box. A 7.5 hp with a heavy frame can cost almost $500.

References

• Electric Motors: Compressor Duty Motors
• Nextag: Air Compressor Motor Comparisons
• "Popular Mechanics: How It Works: Air Compressor"
• Engineering Toolbox: Types of Air Compressors
• About Air Compressors