Strip Wound Cores

MAGNETICS tape wound cores are made from high permeability magnetic strip alloys of nickel-iron (85% or 50% nickel in thicknesses from 0.0005" to 0.004"), silicon-iron (in 0.002", 0.004" and 0.12" thicknesses), and various amorphous metals (0.001" thickness). Available in nylon boxes, tape wound cores are produced as small as 0.375" ID to more than 20" OD, in over 1400 sizes. MAGNETICS tape wound cores are often key components of complicated electronic circuitry found in highly reliable airborne and space computers, telephone systems, radar installations, jet engine controls, power supplies and nuclear reactors. For more information on tape wound cores, please download the MAGNETICS Strip Wound Cores Catalog.

MAGNETICS bobbin cores are miniature tape cores made from ultra-thin (0.000125" to 0.001" thick) strip wound on non-magnetic stainless steel bobbins. Bobbin cores are generally manufactured from Permalloy 80, Orthonol, Supermalloy and amorphous alloys. Covered with protective caps and then epoxy coated, bobbin cores can be made as small as 0.05" ID and with strip widths down to 0.032". Bobbin cores can switch from positive to negative saturation in a few microseconds or less, making them ideal for logic elements, serial/parallel data conversion, and generation of pulse patterns. Because of their temperature stability, low coercive values and high saturation densities, bobbin cores are superior to other types of cores for high frequency magnetic amplifiers, harmonic generators, pulse transformers and other applications. For more information about bobbin cores, please download the MAGNETICS Strip Wound Cores Catalog.

Materials
NOTE: Materials are different than for ferrite cores, even if the code letter is the same. For information on each material, please download the complete MAGNETICS Strip Wound Cores Catalog .

MAGNESIL
• material code "K"
• grain-oriented silicon alloy
• high squareness and flux density
• high Curie temperature

Used in high-quality toroidal power transformers, current transformers, high power saturable reactors and magnetic amplifiers.

SQUARE ORTHONOL
• material code "A"
• grain-oriented nickel-iron alloy
• very high squareness and high core gain

Used in saturable reactors, high gain magnetic amplifiers, bistable switching devices, power inverter-converters, time delays, flux counters and transductors.

ALLOY 48
• material code "H"
• nickel-iron alloy
• low saturation flux density, squareness, coercive force, and core grain

Used in proportioning magnetic amplifiers, special transformers, and saturable reactors.

SQUARE PERMALLOY 80
• material code "D"
• square loop 80% nickel-20% iron allow
• high material squareness and core gain
• low coercive force and core losses for moderate to high frequency applications

Used in magnetic preamplifiers, modulators, and inverters and converters with low power levels and minimum circuit losses.

SUPERMALLOY
• material code "F"
• round loop nickel iron alloy
• exceptionally high permeability
• low core losses

The ultimate in high permeability nickel-iron alloys. Useful in pulse and current transformers, as well as in high precision sensors and amplifiers.

• Protective cap assures integrity of finished assembly of bobbin cores
• Stainless steel bobbins reduce leakage flux and afford greater uniformity in production quantities
• Extensive testing and quality control procedures

Special Advantages of MAGNETICS Strip Wound Cores

• Tape wound cores tested with both IEEE #393 and Sine Current E-I Loop tests
• Cores matched with E-I loop comparison or Current Flux Reset parameters
• Strict quality control includes DC Fluximeter testing and Supermalloy impedance permeability testing