How fractional horsepower motors are rated for harsh motor environments. Understanding IP ratings and harsh duty requirements is important to accurately communicate an application’s requirements.
Video Transcript: Groschopp Tech Tips – Harsh Motor Environments
Hello! This is Bethany with a Groschopp Tech Tip. For today’s Tech Tip we will be discussing Ingress Protection and the requirements for a harsh duty fractional horsepower motors or gearmotors.
When the design requirements require the motor to perform in extreme environments there are several common environmental factors to consider.
A harsh duty motor provides protection from the surrounding environment involving water, dust, or foreign debris, known as Ingress Protection or IP for short. The International Standard IEC 60529 classifies and rates the degrees of protection against entrance of foreign objects and liquids.
IP ratings can be broken down into two sections – solids and liquids.
The ratings start with IPØØ — no protection from solid objects or liquids — and end with IP68 – complete protection from the smallest dust particle and completely submersible for long periods of time.
Most motors and gearmotors have a standard IP rating of 44.
Harsh duty rated motors have an IP rating of 66 or higher. These motors are most often used in applications that will be exposed to extreme environments.
To achieve an IP66 (or higher) motor special sealing techniques are used. Typical sealing practices include rubber O-rings and specially formulated sealants that are applied to bolts and bolt holes, endbells, and shaft outputs. Modifications such, as brush cards on DC motors, also allow for greater protection.
Harsh duty rated motors also need to be able to withstand extremes in temperature, corrosive environments, heavy vibrations, protection against explosions, or a combination of these. Modifications are made to standard product to achieve these protections. Often special coatings or treatments are applied to the motor housing, endbells, and shafts to protect against corrosion and rust. Special gearbox lubrication, motor bearing grease, and other internal components must be used to ensure proper running in excessively hot or cold temperatures.
This has been a Groschopp Tech Tip. For more information about any of our products or to view other Tech Tips please visit us online at www.groschopp.com.
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