Seal-less Motors Withstand Contact with Salt Water

Astrosyn has announced that its latest range of hybrid seal-less stepper motors can operate in wet and corrosive environments thanks to advanced anti-corrosion coatings. A range of corrosion-proof coatings applied to every surface and component, both inside and outside, enables the motors to withstand prolonged contact even with salty water. Traditionally, motors intended for harsh environments are fitted with seals on their shafts and end caps.

However, temperature variations in particular mean than sooner or later these allow in moisture and contaminants, which eventually lead to corrosion and failure. Stepper motors are particularly susceptible to the effects of corrosion, owing to the small air gaps between their rotors and stators. The coatings and materials used in the Astrosyn motors are tailored to each component.

For example, the permanent magnets, aluminium endbells and steel laminations are made from upgraded materials before being given an appropriate coating. Another advantage of eliminating seals, according to Astrosyn, is that seals around the shaft introduce additional friction, which causes a significant reduction in torque. Suitable applications for the motors include mobile phone masts, marine antennas, food processing equipment, chemical industries, and the automotive sector.

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