Tape Wound Cores: Round Permalloy 80

What is Round Permalloy 80?

For more technical information please look at the official Magnetics Strip Wound Core Design Manual.

Round Permalloy 80, a non-oriented 80% nickel-iron alloy, is processed to develop high initial permeability and low coercive force. It has lower squareness and core gain than the square type, as these characteristics are sacrificed to produce the high initial permeability and low coercive force properties. Round Permalloy 80 is especially useful in designing highly sensitive input and inter-stage transformers where signals are extremely low and DC currents are not present. It is also useful in current transformers where losses must be kept to a minimum and high accuracy is a necessity. The initial permeability of this material is between 20,000 and 50,000 with coercive force values about 70% that of Square Permalloy 80.