Motor Housing Selection Guide

When purchasing a motor, one of the key things we need to know is the motor’s housing. The housing plays a key role in the motor, not only acting as a protective cover, but also protecting the motor from environmental factors.

Whether motors are used indoors or outdoors, they are likely to be exposed to moisture, dirt, and dust. Choosing the right motor housing can significantly reduce maintenance costs and extend the life of the motor. There are many types of motor housings, each with different features for specific applications and environments. Understanding these types can help you make an informed decision to ensure optimal performance, safety, and durability of your motor.


Overview of common motor housings

1.   Open Drip Proof (ODP) Housing

The ODP housing prevents water droplets from entering the motor at angles less than 15 degrees from vertical, and the shaft-mounted fan draws air directly from the environment through open vents in the motor body, circulating the air inside the motor and over the stator and rotor windings for cooling.

Although the ODP housing is low cost, it provides very limited protection against airborne dust, moisture and contamination. Use outdoors or in polluted environments will cause corrosion and dirt to form quickly inside the motor, reducing cooling efficiency and shortening the motor life.


2.  Totally Enclosed Fan Cooled (TEFC) Cabinets

TEFC motors are enclosed designs with external fans for cooling and are suitable for use in environments with dirt, dust and moisture. Although more expensive than ODP housings, they offer a higher level of protection and will last longer in optimal condition with good maintenance.

However, one disadvantage of this design is that the cooling performance of the shaft-mounted fan depends on the motor speed and is not suitable for frequent use under low speed and high torque conditions.



3. Totally Enclosed Non-Ventilated (TENV) Enclosure

Totally Enclosed Non-Ventilated (TENV) motors are similar to TEFC motors, except that TENV motors do not have a fan cooling system and rely on passive cooling from the surrounding air to control temperature.

Because TENV enclosures have poor cooling performance, they are more commonly used for smaller motors and are usually equipped with larger and more numerous heat sinks to enhance heat dissipation. TENV enclosures also provide good protection from harsh conditions such as moisture, dust, and other contaminants if the temperature is managed correctly.


4.  Totally Enclosed Air Compressor (TEAO)

These motors are designed without fans in their housings and are typically used in environments with ample air flow, such as plenums in air conditioning or heating systems. With fewer internal moving parts (such as cooling fans), TEAO motors require less maintenance, reducing downtime and maintenance costs.


5.  Explosion proof (XP or XPFC)

Explosion-proof enclosures are designed for hazardous locations where explosive gases or dusts may be present. They can control the explosion of specific hazardous substances within the motor and avoid ignition of flammable gases or particles around the motor, maximizing the safety of operators and infrastructure.



By understanding the main motor housing designs on the current market, you will better understand how to choose the housing suitable for your motor to ensure its long-term stable operation and reduce failures. Kinmore Motor has a professional metal parts stamping workshop and gear production workshop, providing suitable housing designs for different applications and environmental conditions to maximize the service life of the motor.


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