Coil Encapsulation Improves Class F Motor's Protection Against Heat, Moisture

Description
Hansen Corporation has upgraded the performance of its Synchron™ synchronous timing motors for Class F (155°C) service by encapsulating their stator coils with Rynite® PET. The coils were formerly wrapped with tape, and some were coated with varnish. The motors' coil forms are also molded from Rynite® PET.

The redesigned units are the first Class F timing motors to deliver the benefits of thermoplastic encapsulation technology to users. The motors are chiefly used to control and operate vents and valves in heating, ventilation and air conditioning (HVAC) systems.

Benefits
Better moisture resistance. Unlike tape and varnish that can crack or separate, encapsulation with Rynite® PET assures a durable hermetic seal.

Increased heat and overload protection. The encapsulated stator provides more resistance to elevated temperatures, and it reduces shortout risk as indicated by its improved high-potential test performance, according to Hansen.

Lower production costs. Replacing costly tape and varnish steps, the thermoplastic encapsulation process produces high-quality parts in a single step with no secondary finishing.

Higher manufacturing yields. The encapsulation process produces stator coils of uniform height. This is a key advantage in assembly of stacked coils and also results in an in-house quality improvement.

Fast-track development. By using a pre-approved, pre-tested DuPont electrical insulation system (EIS) incorporating Rynite® PET for coil forms and encapsulation, Hansen reduced the time and expense of obtaining recognition of its new motor construction by UL and international standards authorities. Visit www.e-insulationsys.com on the Web for information on the hundreds of DuPont EIS's available.

Materials Used
Encapsulation and Coil form: Rynite® meets requirements for dielectric properties, heat aging resistance, strength, toughness and consistently good molding performance.

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