At NAPCES, one of the most common questions that we get from our customers relates to the different types of motors available, and what the difference is between an open drip-proof motor (ODP) and a totally enclosed fan-cooled (TEFC) motor. Although we offer both types of motors, it’s imperative to understand the differences between the two when going through the purchasing process.

An open drip proof or ODP motor is a type of motor that typically runs cooler and does not overheat. Since the ODP motor enclosure chamber has open vents and air can flow directly over the windings, this open drip proof motor tends to be slightly more efficient because the windings are cooler. Although the ODP motor doesn’t require external cooling (our idler motors have an internal fan) the open concept can allow airborne contaminants and dust to enter the chamber. To protect against anything in the environment, North America Phase Converter idler motors all include laminated windings and sealed bearings. NAPCES ODP idler motors are completely safe to use in all indoor industrial settings.

On the other hand, a totally enclosed fan cooled, or TEFC motor has a closed off chamber which requires the use of an external fan to blow air over it. A benefit to having the motor totally enclosed is that it’s protected from the outside environment, including dust, airborne contaminants, and many weather disturbances such as wind-driven rain. For those wondering, what is a TEFC motor best used for? It’s the preferred choice for applications in outdoor or wet locations.

In the end, however, choosing a motor style depends on the demands of your application. Deciding which would be better for you will depend on the type of environment that it will be operating in.

If you have any questions regarding ODP vs TEFC motors, feel free to contact us! North America Phase Converters & Electrical Supply’s team of professionals is dedicated to ensuring that all of your questions are answered and that you get exactly what you need for your unique application.