Techniques For Eddy Current Reduction In Magnetic Drives Using Metallic Containment Barriers
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Magnetic drive systems, using permanent magnets, are a well known transmitting power through a casing or barrier where penetration of that casing is to be avoided. Several magnetically driven pumps are available today which are aimed at the “sealless” pump market where dynamic shaft seals cannot be used. Most of these units use solid metallic barriers which cannot be anything but inefficient, owing to the generation of wasteful eddy currents. With the increased interest in “sealless” drive systems, especially for 50 hp systems and above, a unique magnetic coupling design, using a metallic pressure containment barrier which operates at high efficiency, has been developed. The eddy current problem is reviewed, the new technology is discussed, and its application is discussed.
Smith, Jeffrey H.; Oliver, John B. (1991). Techniques For Eddy Current Reduction In Magnetic Drives Using Metallic Containment Barriers. Turbomachinery Laboratories, Department of Mechanical Engineering, Texas A&M University. Available electronically from