TEFC

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 probably the most commonly used motor in ordinary industrial environments. It costs a little more than the open motor, but offers increased protection against weather, dirt, and moisture.

The motor is 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. "Wash down" enclosures are designed to withstand regular washing, such as found in a food processing facility

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

References

Siemens Basics of AC Motors

Electric motors

AC - Alternating current DC - Direct current PM - Permanent magnet SC - Self-commutated

Fundamental types	AC motor DC motor

DC motors	Homopolar Electrically-excited field or PM field brushed DC Unipolar

AC SC mechanical commutator	Repulsion Universal

AC SC electronic commutator	Brushless DC (BLDC) Switched reluctance (SRM)

AC asynchronous (induction (IM))	Shaded-pole (single-phase) Dahlander pole changing motor Squirrel-cage rotor (SCIM) Wound-rotor (WRIM) Linear induction

AC synchronous (SM)	Hysteresis Interior / Surface PM (IPMSM / SPMSM) Reluctance (SyRM) Wound-rotor (WRSM)

Special magnetic machines	Doubly-fed Linear Servomotor Stepper Traction

Non-magnetic	Electrostatic Piezoelectric Ultrasonic

Enclosure Type	Hermetic TEFC

Components and accessories	Armature Braking chopper Brush Commutator DC injection braking Field coil Rotor Slip ring Stator Winding

Motor controllers	AC/AC converter Amplidyne Adjustable-speed drive (ASD) Cycloconverter Direct torque control (DTC) Metadyne Motor controller Motor soft starter Motor starter (engine) Power inverter Thyristor drive Variable-frequency drive (VFD) Vector control Voltage controller Ward Leonard control

History, education, recreational use	Timeline of the electric motor Ball bearing motor Barlow's wheel Lynch motor Mendocino motor Mouse mill motor

Experimental, futuristic	Coilgun Railgun Superconducting machine

Related topics	Blocked-rotor test Circle diagram Closed-loop control Electromagnetism Open-circuit test Open-loop controller Power-to-weight ratio Torque and speed of a DC motor Two-phase system

People	Arago Baily Barlow Botto Cook Davenport Davidson Dolivo-Dobrovolsky Faraday Ferraris Froment Gramme Henry Jacobi Jedlik Lenz Maxwell Ørsted Park Pixii Saxton Siemens Sprague Steinmetz Stimpson Sturgeon Tesla

See also	Alternator Electric generator Inchworm motor

SI electromagnetism units	C - Capacitance (F) Q - Charge (C) G, B, Y - Conductance, susceptance, admittance (S) κ, γ, σ - Conductivity (S/m) I - Current (A) D - Electric displacement field (C/m²) E - Electric field (V/m) Φ_E - Electric flux (V·m) χ_e - Electric susceptibility U, ΔV, Δφ; E - Emf (V) L, M - Inductance (H) H - Magnetic field (A/m) strength Φ - Magnetic flux (Wb) B - Magnetic flux density (T) χ - Magnetic susceptibility μ - Permeability (H/m) ε - Permittivity (F/m) P - Power (W) R, X, Z - Resistance, reactance, impedance (Ω) ρ - Resistivity (Ω·m)