The aluminum frame offers a lightweight alternative for many applications such as grain handling installations where there is a risk of combustible dust. The lower weight saves transport costs and uses simpler support structures on site. The motor’s smooth surface prevents dust accumulating on the frame, thereby making it easier to clean, resulting in lower costs and improved safety.
Dust risk is sometimes overlooked because grain, sugar, starch, flour, and coffee, for example, are not normally regarded as explosive. Premises that process or handle these substances, as well as other fine, powdered, combustible materials can greatly increase their safety levels by using dust ignition protection motors rather than standard products.
The products are certified according to the European ATEX directive 2014/34/EU, and the global IECEx system. The certificates include protection types Ex tb for zone 21 installations where combustible dust is likely to occur, and Ex tc for zone 22 installations where combustible dust only occurs in abnormal conditions.
The dust groups covered are IIIC for conductive dust, and IIIB for non-conductive dust also covering IIIA for combustible filings.
For locations having a potential risk of gas, the Ex ec protection suitable for zone 2 installations is available. Ex ec is the new increased safety protection concept introduced by the latest revision of IEC/EN 60079-7, replacing non-sparking (Ex nA) protection for electric motors.
Third party certificates from an official certification body are available for all categories, also for those where it’s not required by the ATEX directive. The certificates include the possibility to operate the motors with a frequency converter for maximised energy savings and speed control.