MPP cores are ring cores that are made of material containing 79% of nickel, 17% of iron and 4% of molybdenum powder and having a smallest losses among all powder materials. Main advantages of MPP cores are high specific resistance, low values of hysteresis and eddy currents, high stability of inductance following a magnetization by high current. High temperature and time stability of magnetic permeability versus temperature make these cores irreplaceable for production of high-precision inductance coils operating in wide temperature range. In usual storage conditions, a variation of core’s inductance will not exceed 0.05%.
High Flux cores are made of material containing 50% of nickel and 50% of powder iron and have a higher saturation magnetic flux density as compared with other powder materials. High Flux have a series of advantages that permit to recommend these cores for applications requiring high power, high magnetic biasing by direct or alternating current at high frequencies. High Flux’s saturation magnetic flux density is 1.5 T what is considerably higher than 0.75 T for standard MPP cores or 0.45 T for ferrite cores. High Flux cores have losses that are considerably lower than losses of powder iron cores. In most applications, a use of High Flux cores provides a significant size reduction of wrap-in products as compared with other cores made of powder materials.
Kool Mµ cores are made of iron-aluminium alloy and are characterized by low losses at higher frequencies. Near-to zero magnetostriction makes Kool Mµ cores ideally suitable for suppression of acoustic noises in filters. Kool Mµ cores have considerably lesser losses than cores made of material based on spayed iron and provide a size reduction of wrap-in products and a decreased value of temperature jumps as compared with last-mentioned. Owing to a low cost, Kool Mµ cores are extensively used worldwide in circuits of power supplies.
XFLUX cores that are made of material not containing high-priced nickel and therefore are not expensive, combine such characteristics which were earlier inaccessible for other materials non containing nickel, as increased inductance value (1.6 T) and high stability of magnetic permeability versus temperature.
At present moment along with noted permalloys and powder iron it is actual to use Magnetics Amoflux® (Fе Si B) material in industrial power supplies, computers and other devices, where power factor correction and DC chokes installation are required. Due to the presence of a distributed gap, it is possible to significantly reduce core losses and achieve a high saturation induction values (1.5 T). In addition, this alloy has the stability of parameters such as saturation induction and core loss at temperatures up to 155 °C. Amoflux® cores are available in ring shapes with a magnetic permeability of 60.
| The comparing of Amoflux® and other materials | General characteristics | High Flux | Kool Mµ | MPP |
| Core losses | Amoflux® is 50% better | Similar | MPP is better |
| DC Bias | High Flux is better | Amoflux® is 50% better | Amoflux® is 30% better |
| Cost | Amoflux® is lower | Kool Mµ is lower | Amoflux® is much lower | Amoflux® benefits | Better efficiency and a more cost-effective solution | Higher current handling,potential size reduction and less copper required | Higher current handling, potential size reduction, less copper required, and a more cost-effective solution |
| Amoflux® Dimensions and Magnetic Data[2]. | |||||||||
| Dimensions (after finish) | Part Number | Permeability | AL±8% (nH/T²) | Weight, g | Effective parameters | ||||
| OD, mm | ID, mm | HT, mm | Ve, mm³ | Ae, mm² | Le , mm |
||||
| 24,4 | 13,7 | 9,66 | 0088351A7 | 60 | 51 | 14 | 2,280 | 38,8 | 58,8 |
| 27,69 | 14,1 | 12,0 | 0088894A7 | 60 | 75 | 26 | 4,150 | 65,4 | 63,5 |
| 33,66 | 19,4 | 11,5 | 0088071A7 | 60 | 61 | 33 | 5,340 | 65,6 | 81,4 |
| 40,77 | 23,3 | 15,4 | 0088083A7 | 60 | 81 | 65 | 10,600 | 107 | 98,4 |
| 47,63 | 23,3 | 19,0 | 0088439A7 | 60 | 135 | 131 | 21,300 | 199 | 107 |
| 58,04 | 25,57 | 16,2 | 0088192A7 | 60 | 138 | 173 | 28,600 | 229 | 125 |
75-Series Toroid cores are made of alloy based on Fe, Si and Al and are characterized by improved properties (better DC Bias performance) than Kool Mµ and lower core losses than XFlux. ®. The relatively high saturation flux density of 75-Series cores makes them a low-cost solution in applications where stable inductance under load is necessary, such as inverters for renewable energy sources and Uninterruptible Power Supplies (UPS).
75-Series cores can offer a lower cost alternative to High Flux cores and offer a substantial improvement in core loss and DC Bias performance when compared to Iron Powder.
| Available Sizes and Permeabilities of 75-Series | |||
| Toroid OD: | 26μ | 40μ | 60μ |
| 27 mm | 0075932A7 | 0075936A7 | 0075894A7 |
| 47 mm | 0075440A7 | 0075431A7 | 0075439A7 |
| 57 mm | 0075191A7 | 0075189A7 | 0075192A7 |
| DC Bias and Core Loss of 75-Series | Permeability | 26μ | 40μ | 60μ |
| DC Bias(A·T/sm) | |||
| Rolloff (80%) | 128 | 80 | 56 |
| Rolloff (50%) | 282 | 183 | 115 |
| Core Loss (mW/sm³) | |||
| at 100 mT and 50kHz | 700 | 676 | 537 | at 100 mT and 100kHz | 1900 | 1860 | 1425 |
In March 2017 Magnetics added the new material Kool Mμ® MAX to the range of powder cores. The new material is characterized by lower losses, a high stability of permeability in case of DC BIAS comparing to Kool Mμ® material.
Kool Mμ® MAX is the next generation of sendust cores from Magnetics. The company supercharged their low core loss Kool Mμ material with 50% better DC bias performance for better power handling. Use of copper wire is minimized by maintaining inductance using less turns, resulting in savings in overall component cost. With its super low losses, Kool Mμ MAX does not mimic the temperature rise problems found in iron powder cores. You can improve inductor efficiency at a fraction of the cost of High Flux with Kool Mμ MAX.
Kool Mμ® MAX dimensions and permeability values
Kool Mμ® MAX cores are produced in toroid shape with permeabilities 26 and 60 and cover size range from R13.5 to R134 (after finish). Coating color is black.
| Dimensions before finish (epoxy) (mm) |
26μ | 60μ |
| 12.7 х 7.62 х 4.75 | 0079052A7 | 0079051A7 |
| 16.6 х 10.2 х 6.35 | 0079122A7 | 0079121A7 |
| 17.3 х 9.65 х 6.35 | 0079382A7 | 0079381A7 |
| 20.3 х 12.7 х 6.35 | 0079208A7 | 0079848A7 |
| 22.9 х 14.0 х 7.62 | 0079312A7 | 0079059A7 |
| 23.6 х 14.4 х 8.89 | 0079352A7 | 0079351A7 |
| 26.9 х 14.7 х 11.2 | 0079932A7 | 0079894A7 |
| 32.8 х 20.1 х 10.7 | 0079550A7 | 0079071A7 |
| 34.3 х 23.4 х 8.89 | 0079587A7 | 0079586A7 |
| 35.8 х 22.4 х 10.5 | 0079326A7 | 0079076A7 |
| 39.9 х 24.1 х 14.5 | 0079256A7 | 0079083A7 |
| 46.7 х 24.1 х 18.0 | 0079440A7 | 0079439A7 |
| 46.7 х 28.7 х 15.2 | 0079091A7 | 0079090A7 |
| 50.8 х 31.8 х 13.5 | 0079717A7 | 0079716A7 |
| 57.2 х 26.4 х 15.2 | 0079191A7 | 0079192A7 |
| 57.2 х 35.6 х 14 | 0079111A7 | 0079110A7 |
| 62 х 32.6 х 25 | 0079615A7 | 0079617A7 |
| 74.1 х 45.3 х 35 | 0079735A7 | 0079737A7 |
| 77.8 х 49.2 х 12.7 | 0079868A7 | - |
| 77.8 х 49.2 х 15.9 | 0079908A7 | 0079907A7 |
| 101.6 х 57.2 х 16.5 | 0079102A7 | 0079099A7 |
| 134 х 77.19 х 26.8 (*) | 0079337A7 | - |
(*)Dimensions for this core are given before epoxy coating formation.
Magnetics permalloys characteristics
| Material | Composition | Permeability stability at DC BIAS | Core Loss | Relative Cost | Saturation Flux Density (Tesla) | Curie Temperature | Operating Temp. Range | 60μ, flat dependence from frequency |
| XFlux® | Fe Si | Highest | High | Low | 1.6 Т | 700 °С | -55 ... 200 °С | 500 kHz |
| High Flux | Fe Ni | Highest | Moderate | High | 1.5 Т | 500 °С | -55 ... 200 °С | 1 МHz |
| 75-Series | Fe Si Al | High | Moderate | Low | 1.5 Т | 700 °С | -55 ... 200 °С | 500 kHz |
| Kool Mμ® MAX | Fe Si Al | High | Very Low | Medium | 1.0 Т | 500 °С | -55 ... 200 °С | 900 kHz |
| MPP | Fe Ni Mo | Very Low | Highest | 0.8 Т | 460 °С | -55 ... 200 °С | 2 MHz | |
| Kool Mμ® | Fe Si Al | Moderate | Low | Low | 1.0 Т | 500 °С | -55 ... 200 °С | 900 kHz |
| Iron Powder | Fe | Moderate | Highest | Lowest | 1.2 - 1.5 Тл | 770 °С | -30 ... 75 °С | 500 kHz |
| Ferrite | Ceramic technology | Low | Lowest | Lowest | 0.45 Тл | 100 - 250 °С | Variable | Variable |
Selection of analogues in Magnetics production based on core’s code (code part)
To substitute currently used products with products of Magnetics and to select a most suitable required analogue, you may access to cross-reference list.
Ring Powder Cores Made of MPP, High Flux, KooL Mµ, XFlux, AmoFlux, 75-Series materials
Ring Powder Cores Made of MPP, High Flux, KooL Mu, XFlux materials
Thin Ring Cores Made of MPP THINZ Mo-permalloy
Thin Ring Cores Made of MPP THINZ Mo-permalloy
E-configured Cores Made of KooL Mµ Material
E-configured Cores Made of KooL Mu Material
EQ cores made of XFLUX material.
EQ cores made of powder materials
U-configured Cores and I-Plate Made of Kool Mµ Material
U-configured Cores and I-Plate Made of Kool Mu Material
Cylinder and Round Block Cores
Designs with rounded block cores
Powerful Composite Magnetic Circuits of Ring and Oval Configurations Made of Kool Mµ Material
Powerful Composite Magnetic Circuits of Ring and Oval Configurations Made of Kool Mu Material
Advantages of Magnetics’s Powder Materials
- Expanded Nomenclature Series.
- Presence of dielectric coating that makes a winding process easier and significantly increases a life time of products being operated in worse climatic environment and withstands a breakdown voltage of up to 1500 V.
- Tighter requirements for a variation of single-turn inductance ratio (up to 2%) - domestic Russian КГЖП757140.001ТУ norm with acceptance 5 permits a variation of up to 10%.
- Availability of thermo-compensated technological modes permitting to produce high-stability precision inductance coils for operation in wide temperature range.
- Excellent technical support in form of literature and articles.
- Low (as compared with domestic-made powder materials) cost of cores.
