The Most Common Types Of Electric Motor Enclosures

Electric motors

Electric Motors are available in various types of enclosures, each providing different levels of protection and cooling. The enclosure type is selected based on application to protect the motor's bearings, windings, and other parts from dust, moisture, chemicals, mechanical damage, and other contaminants. 

 

The most common types of enclosures are:

 

Open Drip Proof (ODP)

 

ODP enclosures are suitable for clean, dry, and indoor applications. The ventilation holes are designed to prevent water droplets from falling at 15 degrees or less from vertically entering the motor. 

 

Weather Protected (WP1 / WP2) 

 

WP1 is an enhanced version of the ODP. The addition of screens to an ODP motor prevents the ingress of large particles from entering the motor.

WP2 has, in addition to WP1, its ventilation passages arranged so that high-velocity air and air particles can be discharged without entering the internal ventilating passages. The flow path is designed for at least three abrupt changes in direction, none of which are to be less than 90 degrees. 

 

Totally Enclosed Fan Cooled (TEFC)

 

A totally enclosed motor with an external fan that blows air across the motor frame's external cooling fins. This enclosure is the most popular.

 

Totally Enclosed Non-Ventilated (TENV)

 

Similar to a TEFC but has no cooling fan. It dissipates heat through the frame and mounting surface. The motor is designed with a low enough temperature rise so that an external fan is not required. 
 

Totally Enclosed Air Over (TEAO)

 

This enclosure is also similar to TEFC, only instead of having its own cooling fan, it uses airflow from an external source that blows the air across the motor to cool it. A typical application would be a fan mounted on the motor's output shaft. 

 

Totally Enclosed Forced Ventilated (TEFV)

 

They are designed for motors that operate over an extended speed range. The TEFV enclosure utilizes a constant-speed fan to cool the motor. The motor will get enough airflow even during extremely low speeds. 

 

XP (Explosion Proof)

 

Explosion-proof motors are intended for use in hazardous locations in the presence of explosive liquids, gasses, dust, etc. The locations are classified according to the nature of the hazard. The CLASS designation indicates the types of combustible to be expected: Class I means combustible gases or vapors; Class II indicates combustible or electrically conductive dust, and Class III shows easily ignitable fibers, such as sisal, hemp, cocoa fiber, oakum, and other materials of similar nature.

 

Also, check out our article Five Main Causes of Electric Motors Failure.

Feel free to Contact Us if you have any questions or need more information regarding the difference between the different types of enclosures. 

HVH Industrial Solutions is an authorized distributor of the following motor manufacturers: Elektrim Motors, WorldWide Electric, Toshiba Motors & DrivesAurora Motors, WEGMGM Electric Motors, and Brook Crompton. We work closely with their engineering teams to provide superior customer service and support.

 

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Vladimir Harutyunyan

Vladimir Harutyunyan is the founder of HVH Industrial. He has masters degree in mechanical engineering and over 10 years of experience in mechanical power transmission field. 

Feel free to connect with Vlad on Linkedin: https://www.linkedin.com/in/vladharut



image

Vladimir Harutyunyan

Vladimir Harutyunyan is the founder of HVH Industrial ...

Feel free to connect with Vlad on Linkedin: https://www.linkedin.com/in/vladharut


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