Nesscap Ultrapacitors has just released a new whitepaper describing Ultracapacitors and their use in Wind Power Turbine Generators. Read the full document here.
The ferrite industry has been affected by an extreme shortage of product in 2010. This is primarily due to an increase in ferrite consumption in Asia. We have seen ferrite manufacturers either discontinue their 15K permeability ferrite or highly restrict the manufacturing of this extreme material. (15K perm material is very difficult to make and keep within spec) Even the 10K permeability material is seeing lead times of 30 weeks and longer.
MH&W International is offering a solution to the problems of high perm ferrite and the shortage of high perm ferrite with our Nanocrystalline toroidal cores for common mode chokes. There are significant advantages of Nanocrystalline over 15K & 10K perm material.
|
10K Perm Ferrite
|
15K Perm Ferrite
|
Nanocrystalline
|
|
|---|---|---|---|
| Saturation Flux Density |
400 mT
|
360 mT
|
1,200 mT
|
| Curie Temperature |
120°C
|
105 °C
|
600°C
|
| Core Loss |
High
|
High
|
Low ( >110W/Kg)
|
| Magnetostriction/Vallari Effect |
Susceptible
|
Highly Susceptible
|
No apparent effect
|
Nanocrystalline is available with Permeabilities of 1,000 to 90,000.
MH&W keeps stock of some of the more common sizes of Nanocrystalline toroids. Here is a table of the most prevalent Nanocrystalline toroids.
Chang Sung Corp, the leader in powder core technology has expanded it’s toroid line to larger sizes. For Alternative Energy the preferred material for these toroids is the CSC MegaFlux material.
As a material review, Chang Sung was the first powder core company to introduce a Silicon-Steel powder for, essentially replacing Silicon-steel laminations in transformers. The advantage of the MegaFlux is lower core losses and a higher operating frequency. The MegaFlux can also be pressed is varying shapes, the most common are the Toroid, EE core, and Blocks.
Chang Sung has recently introduced the toroids in the sizes from four (4) inch to six (6) inch. These toroids are summarized in the following table.
TDK Corporation has announced the intention to discontinue the PC50 power material. The factory is replacing the PC50 material with PC95 material on all quotations. Therefore it is imperative that we understand the differences between the PC50 and PC95.
PC50 History – The PC50 material was announced in 1988 after years of developing new processes for powder preparation and Sintering. The PC50 material was the first ferrite material design for the operating frequency of 500 KHz – 1MHz. A review of the power material can be found in the paper entitled Ferrite power material for high-frequency applications by Tadashi Mitsui and Gary Van Schaick. This document can be found at:
http://www.mhw-intl.com/assets/TDK/Ferrite%20Material%20for%20HF%20Application.pdf
A couple of key points can be found in this paper.
