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Soft Magnetic Products
POWDER CORES
Molybdenum Permalloy, HI-FLUX® and SUPER-MSS® (sendust) powder cores are wound with magnet wire to make transformers or inductors. Maximum allowable energy dissipation for a given value of energy storage (inductance and current) or transformation (voltage and current), guide the selection of core material and size. Energy dissipation is usually specified in terms of maximum temperature rise, minimum efficiency or minimum Q value. Consider the following when choosing a core material.
- Molybdenum Permalloy Powder (MPP) cores provide the maximum Q and lowest core loss. MPP is the most stable core with respect to temperature and AC flux. It has the widest range of permeabilities and is considered the premium material for direct current output inductors of switched mode power supplies.
- HI-FLUXTM cores are a 50% nickel, 50% iron distributed air gap powder core. HF has up to 15,000 Gauss saturation flux density and core losses significantly lower than iron powder cores. These cores are ideal for switching regulator inductors, in-line noise filters, pulse and fly-back transformers applications. When used in applications with high DC current, HF cores can provide a reduction in inductor size as well as total cost.
- SUPER-MSSTM is an improved Sendust material, originally develped by Arnold Engineering. It is designed to replace iron powder by offering much lower losses, with energy storage capability higher than MPP. SUPER-MSS cores are an excellent choice for energy storage and filter inductor applications in switch mode power supplies. The DC bias characteristics of SUPER-MSS are also excellent compared to iron powder of similar permeabilities and size.
- Crystal-XTM is one of the newer members of the Arnold powder core family. Crystal-X powder cores have low core loss and excellent DC bias characteristics, which contribute to highly efficient switching. Crystal-X offers significant size & weight reduction when compared with other powder core materials.
- Fe-SiTM series powder cores are manufactured from a complex composition of Iron-Silicon powdered particles, compacted into geometries such as toroid, block, E or Ucore shapes. The powder metal compaction process produces a product with excellent core loss performance compared with the conventional silicon-iron tape wound core due to the distributed air gap feature.
SILICON-IRON (LAMINATION) STEEL
Silicon-Iron, also referred to as Electrical Steel, is available in thin strip and sheet and is used for laminations in transformers, inductors, motors and generators. Its advantages include high saturation magnetization with low coercivity resulting in low hysteresis loss. The presence of silicon in the composition results in increased electrical resistivity which reduces eddy current loss. Arnold's products span thicknesses of 0.001" to 0.007" thick (0.025 to 0.178 mm). These thinner gauges are even more effective in applications with switching frequencies greater than 400 Hz.
- Grain Oriented Electrical Steel (GOES) is the preferred material for transformers and inductors. Arnold's thin gauge products are especially useful in high frequency, high efficiency devices where heat loss must be minimized and efficiency optimized.
- Non-Grain Oriented Electrical Steel (NGOES) is used for rotating machinery such as motors and generators. Arnold's thin gauge products are called by the trade name ARNONTM and have industry-leading low-loss characteristics.
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