Lebanon, N.H.  January 16, 2004.   Several leading airline manufacturers are using a unique “canned-rotor” magnetic resolver to eliminate the shaft seal for rotary feedback sensors in hydraulic actuators.  The resolver design, illustrated below, permits the rotor to operate directly in hydraulic fluid such as Skydrol or in liquid hydrogen.

According to the resolver manufacturer, Admotec Inc., Lebanon, N.H. (www.admotec.com), this special resolver will operate at pressures up to 3000 psi, speeds up to 10,000 rpm and temperatures from -25° to +220°C.  This rotary transducer transmits absolute position information from rotating parts inside the sealed container without the need of a shaft seal.

Although initially designed for aerospace use, the “canned-rotor” resolver can also be used in automotive and other industrial applications where shaftless resolver or RVDT sealing is required.

This special transducer is based on a standard product, the Rotasyn resolver, that has fewer moving parts and a solid rotor without slots or the need for a transformer.