Strip wound magnetic cores may be used as key components of complex electronic devices being implemented into high-reliability on-board computers of airway and space industries, into telephone systems, radar installations, control systems of reactive engines, power supplies and nuclear reactors.
Magnetics Inc. issues soft magnetic materials intended for magnetic cores and based on a tape for magnetic circuits with saturation and high responsiveness in various application forms.. These materials are specially selected and processed with a purpose to satisfy precise requirements for concrete magnetic circuit and are produced for a guaranteed withstand of tight tolerances following a test according to standard procedures IEEE and to other common-use industrial techniques.
Main types of issued cores:
- Magnetics’s ring cored bases on a tape - Tape Wooud Cores
- Magnetics’s ring cores based on a thin rape - Bobbin Cores
- Magnetics’s cores based on a tape - Cut Cores
Material Code — "A"
This material is a grain-oriented alloy consisting of 50% nickel and 50% of iron that is issued to satisfy concrete requirements for a high squareness degree of hysteresis loop and to a high amplification ratio within a core and is used typically in saturating reactors, in magnetic amplifiers with high amplification, in bi-stable switching devices and in power systems with inverters/converters.. Other applications requiring a use of square ortonol are delay lines, flow meters and measuring transducers where a high precision of hysteresis loop’s square form is required.
"Square" Permalloy 80
Material Code — "D"
This material is a non-grain oriented nickel-iron alloy with a 80% content of nickel that is issued to satisfy concrete requirements for a high squareness degree and to a high amplification ratio within a core in magnetic pre-amplifiers and modulators. Particularly, this material is very useful in inverters and converters where a high voltage at low power levels is required but with circuit losses being reduced to a minimum. Square Permalloy 80 has a saturation magnetic flux density that is twice lower as compared with Square Orthonol but with values of coercitive force that are approximately 1/5 - 1/7 of this parameter of grain-oriented alloy having 50% of nickel and 50% of iron. Within a core made of Square Permalloy 80, amplification value is approximately 1.7 times higher than within a core made of Square Orthonol.
Material Code — "F"
This material is a result of special technological processing of nickel-iron ally containing 80% of nickel. It is produces to obtain extreme values of high initial magnetic permeability and low losses. Values of initial magnetic permeability are from 40000 to 100000 with a value of coercitive force being approximately 1/3 of coercitive force of Square Permalloy 80. Supermalloy is very useful in extra-sensitive transformers (especially in pulse transformers) and in extra-sensitive magnetic amplifiers where low losses are a obligatory prerequisite of operation.
Material Code — "K"
This material being a grain-oriented iron-silicon alloy with a 3% content of silicon, is technologically processed and annealed to obtain a high squareness degree of hysteresis loop and low losses within a core. Typically it is used in high-quality toroidal power transformers, current transformers, in magnetic amplifiers and in saturating reactors with high power level. This material has a high saturation magnetic flux density at a high degree of hysteresis loop’s squareness but is characterized by a relatively high values of coercitive force and losses within a core. Owing to a high value of Curie temperature, this material is very useful in magnetic devices being influenced by temperatures within a range from 200°C (392°F) to 500°C (932°F). At higher values of temperature, only cores without coating should be used due to temperature restrictions for a coating.
Material Code — "H"
This material being an alloy with 50% of nickel and 50% of iron, has a round hysteresis loop in B-H coordinates and is characterized by lesser value of saturation magnetic flux density, lesser squareness, lesser coercitive force and lower amplification within a core than a standard Orthonol. This material is useful in such devices requiring a reduced coercitive force as special transformers, saturating reactors and magnetic amplifiers with proportional amplification. Alternating current losses within a core made of 48 Alloy are typically lower than within a core made of Square Orthonol.
"Round" Permalloy 80
Material Code — "R"
This material being a non-grain oriented iron-nickel alloy with a 80% content of nickel, is processed according to a technology providing a high initial magnetic permeability and a low coercitive force of obtained material. This material has lesser degree of squareness and lesser amplification within a core than a ”square” material since a high initial magnetic permeability and a low coercitive force are achieved namely at the cost of reducing these characteristics.. Round Permalloy 80 is especially useful on designing high-responsive transformers of input and intermediate stages where extremely low signals are present and a constant current is absent. This material id used also n current transformers where it is necessary to preserve minimal losses and where a high precision is an obligatory feature. Initial magnetic permeability of this material is typically from 20000 to 50000 at values of coercitive force being equal approximately to 70% of Square Permalloy 80's coercitive force.
Material Code — "S"
This material being a high-degree cleaning alloy with 50% of iron and 50% of cobalt, is produced in small quantities on special orders. It is processed and annealed by special techniques to obtain a high degree of hysteresis loop’s squareness and a high saturation magnetic flux density.. Supermendur is successfully used id devices requiring a maximum possible miniaturization and an operation in environment with high temperature. This material may be used in the same applications as Magnesil but a higher magnetic flux density (approximately 21000 gauss) of this material permits to reduce a size and a weight of core. This material has a highest value of Curie temperature among all available alloys having a square-form hysteresis loop and therefore it is especially suitable for operation at high temperatures.
Typical Features of Magnetic Alloys
|Ni-Fe (A, H)
|Ni-Fe (R, D, F)
|% of iron||97||50||17||49|
|% of nickel||50||79|
|% of cobalt||44|
|% of silicon 3||5|
|% of molybdene||4|
|% of other materials||2|
|Curie Temperature (°C)||750||500||460||940|
|Specific Heat Emission (cal/g-cm³)||0,12||0,12||0,118||0,118|
|Specific Resistance (uOhm-cm)||50||45||57||26|
Magnetic Materials – Comparison of Characteristics
|Code||Material Type||Magnetic Flux Density||Br/Bm||Coercitive Force
CCFR at a frequency of 400 Hz**
|A||"Square" Orthonol||14,2 - 15,8||1,42 - 1,58||0,88 and more||0,15 - 0,25||11,9 - 19,9|
|D||"Square" Permalloy 80||6,6 - 8,2||0,66 - 0,82||0,80 and more||0,022 - 0,044||1,75 - 3,50|
|F||Supermalloy||6,5 - 8,2||0,65 - 0,82||0,40 - 0,70||0,004 - 0,015||0,32 - 1,19|
|H||48 Alloy||11,5 - 14,0||1,15 - 1,40||0,80 - 0,92||0,08 - 0,15||6,4 - 12,0|
|K||Magnesil||15,0 - 18,0||1,5 - 1,8||0,85 and more||0,45 - 0,65||35,8 - 51,7|
|R||"Round" Permalloy 80||6,6 - 8,2||0,66 - 0,82||0,45 - 0,75||0,008 - 0,026||0,64 - 2,07|
|S||Supermendur||19,0 - 22,0||1,9 - 2,2||0,90 and more||0,50 - 0,70||39,8 - 55,7|