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A Totally Enclosed, Fan-Cooled (TEFC) electric motor is a type of industrial electric motor with an enclosure that does not permit outside air to freely circulate through the interior of the motor. An external fan blows outside air over the frame of the motor to cool it. This motor is arguably the most commonly used motor in ordinary industrial environments. TEFC enclosed motors usually cost more than open motors, but offers increased protection against weather, dirt, and moisture.

TEFC motors are constructed with a small fan on the rear shaft of the motor, covered by a housing. This fan forces air over the motor frame fins, and cools the motor. The enclosure is "Totally Enclosed". This means that the motor is dust tight, and has a moderate water seal as well. TEFC motors are not secure against high pressure water nor submersible. They are also not explosion proof without additional modifications.

Applications / Types of TEFC Motors[edit]

  • "General Purpose" Fractional Horse Power Motors - Often rolled made of rolled steel. These are multi-purpose motors suitable for a diverse range of industrial applications. Usually offered in HP ranges from 1/3 to 2.
  • Farm Duty Motors - These high torque and robust designed motors make it a good choice for many farm applications. Especially being totally enclosed and protected from the environment.
  • "Wash Down" Motors - "Wash down" enclosures are designed to withstand regular washing, such as found in a food processing facility.
  • Rock Crusher Motors - These motors are also an excellent choice for hammermills, pellet mills, and chippers for the biomass industry.
  • Oil Well Pump Motors
  • Severe Duty Motors

Compare to ODP (Open Drip Proof motor), which has ventilation openings guarded to prevent falling water from entering the motor windings.