The feasibility of improving variable reluctance sonar transducer magnetic core materials by substituting a Supermendur(49% Co - 49%. Fe - 2%. V) tape wound core for the presently used grain-oriented silicon-iron cores was investigated. A 43-percent improvement in residual induction over the silicon-iron cores was realized by developing a technique to cut Supermendur core materials without degradation. This new core material promises to improve the efficiency of the transducer by providing either a more compact design or an increase in its output.nThe method consists of electrolytic cutting of a rigid encapsulation of the Supermendur core followed by careful lapping of the degraded surface. Some engineering effort remains to extend this laboratory development to a commercial level.
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