Falling between standard TEFC motors and IEEE 841 motors, severe duty motors are specially designed to handle challenging environments. They are used in industrial applications that require protection from humidity, corrosion, heat, and other mechanical stress. No matter the conditions, severe duty motors are well-equipped to power pumps, compressors, fans, and other equipment.
Why Severe Duty Motors are Perfect for Harsh Conditions
Severe duty motors provide quality performance and can outlast their TEFC counterparts in harsh conditions. Specifically designed for industries that require motor protection, these devices are rugged and well-suited to harsh environments. Severe duty motors come with many features to protect against contamination, moisture, and vibrations. Fully enclosed cast iron construction and insulation systems ensure that these motors can handle exposure to ash, sawdust, and other airborne particles. As opposed to the 1-year warranty for standard models, severe duty motor warranties typically last for three years or longer.
Advantages and Features of Severe Duty Motors
Severe duty motors feature well-designed components, such as an enclosed frame, end shields, and caps to protect the inner mechanics from contamination. Extensive cast bracing in the feet and frame shield the device from mechanical disturbances. To assist with cooling, severe duty motors feature an external fan and fan cover. Finally, the cast iron construction and gasketed main terminal box protect the device from harsh conditions.
In comparison to standard TEFC motors, severe duty motors have many advantages in terms of reliability and performance. Severe duty motors are designed for advanced uses in challenging environments. Standard motors are unable to withstand the airborne contamination and mechanical stress that severe duty motors handle with ease. In addition, severe duty motors provide high efficiency at a cost-efficient price. This improved performance also helps reduce energy consumption.
Corrosive, Humidity, Salt, and Heat Resistances
Severe duty motors can function in humid, corrosive, salty, and high heat environments. They operate between -25°C and 40°C. Open drip proof (ODP) motors reduce liquid contamination, but the vents in the housing allow for air intake. Unlike ODP motors, severe duty models are constructed to prevent all contamination. The frame prevents air exchange between the outdoor environment and internal mechanics. In addition, the improved seals limit intake of dust and water. Severe duty motors include V-rings instead of O-rings for both the drive and non-drive ends of the motor for increased protection. Finally, most severe duty pumps are coated in high-quality paint for increased corrosion resistance.
TEFC vs Severe Duty vs IEEE 841 Standard
There are a variety of motors with different characteristics to meet industry needs. Totally enclosed fan-cooled motors minimize costs while meeting certain requirements. They are typically constructed with rolled steel or cast aluminum. TEFC motors are appropriate for everyday applications. However, their lifespan shortens significantly when exposed to contamination or mechanical stress.
Severe duty motors don’t have a designated specification but offer features between standard TECF and full IEEE 841 motors. The majority are designed to meet efficiency benchmarks even if they are not fully IEEE 841 compliant. They are capable of handling harsh conditions thanks to stronger seals and solid cast iron construction. Severe duty motors are good for rugged applications and will function continuously even with demanding duty cycles, vibrations, and moisture.
The IEEE 841 standard outlines industry-level specifications created for the petroleum and chemical industries. They guarantee improved reliability, efficiency, and performance of motors as defined by the National Electrical Manufacturers Association. This standard has been adapted for other industries with some changes for relevant features. IEEE 841 motors offer uniform specifications while reducing the total cost of ownership.
Common Applications and Industries
Severe duty motors are ideal for constant speed or inverter duty applications. They outperform standard TEFC motors in harsh environments. Compressors, pumps, fans, conveyors, gear reducers, blowers, material handling equipment, and machine tools are just some applications where severe duty motors are utilized.
No matter the industry, severe duty motors provide high efficiency and long-lasting performance. They can function in environments with contamination or mechanical vibrations. Some industries that use severe duty motors include:
- Forest products
- Oil & Gas