The Most Common Types Of Electric Motor Enclosures

Elektrim Motor

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 bearings, windings, and other parts of the motor 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 falling at 15 degrees or less from vertical enter the motor. 


Weather Protected (WP1 / WP2) 


WP1 is 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 to at least three abrupt changes in direction, none of which to be less than 90 degrees. 


Totally Enclosed Fan Cooled (TEFC)


A totally enclosed motor with external shaft driven fan which 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 an 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 output shaft of the motor. 


Totally Enclosed Forced Ventilated (TEFV)


Designed for motors that operate over an extended speed range. The TEFV enclosure utilizes constant speed fan to cool the motor. This way the motor will get enough airflow even when the speed is really low. 


XP (Explosion Proof)


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


Feel free to Contact Us if you have any questions, need more information or if you are interested in purchasing an electric motor. HVH is a power transmission distributor doing business in USA.

Visit: Electric Motors 

HVH Industrial Solutions is an authorized distributor of the following electric motor manufacturers: Elektrim Motors, WEG, Toshiba Motors & Drives, Brook Crompton, Lafert North America, MGM Electric MotorsNorth American Electric, Techtop Electric Motors,  Aurora Motors, Worldwide Electric. 

We work closely with the engineering teams of the companies mentioned above 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:


Vladimir Harutyunyan

Vladimir Harutyunyan is the founder of HVH Industrial ...

Feel free to connect with Vlad on Linkedin:

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