Abstract
Due to lacking the measurement results of magnetic properties under rotational magnetization, the application of nanocrystalline alloys for high-power system energy conservation has been limited. In this paper, a high-frequency rotational magnetic property testing system is first introduced. Base on the testing system, the rotating loci of the vector magnetic flux density B and the vector magnetic field strength H are measured. Finally, the rotational core loss and anisotropy of nanocrystalline alloys are discussed and analyzed.
Highlights
The Hitachi Finemet type Fe based nanocrystalline alloys are usually used in high frequency and high-power density transformers of the DC-DC converter in smart grid renewable energy systems
At the state of the art, stacked cores and block structure cores of nanocrystalline materials have been developed for magnetic chokes and high-frequency transformers in high power application due to the high performance in large magnetic cores
The magnetic properties of nanocrystalline alloys under rotational magnetization have been measured by a highfrequency rotational magnetic property testing system
Summary
As kinds of high frequency soft magnetic materials with high permeability and low losses, nanocrystalline alloys have significant applications in the field of high-frequency energy conservation. The Hitachi Finemet type Fe based nanocrystalline alloys are usually used in high frequency and high-power density transformers of the DC-DC converter in smart grid renewable energy systems. The classic application of nanocrystalline alloys is used as ring core which is not the best way in terms of size and congestion problems. For higher power applications, the UU or CC shape cut cores are more commonly used. But, the magnetic properties of soft magnetic materials can be affected by cutting and punching process. At the state of the art, stacked cores and block structure cores of nanocrystalline materials have been developed for magnetic chokes and high-frequency transformers in high power application due to the high performance in large magnetic cores (over 70 kg). the measuring methods of magnetic properties of nanocrystalline alloys are restricted to the one-dimensional method (Alternating magnetic field magnetization). The measuring methods of magnetic properties of nanocrystalline alloys are restricted to the one-dimensional method (Alternating magnetic field magnetization). When the magnetic cores used as stacked or laminated cores of nanocrystalline materials, the vector magnetic properties considering the anisotropy and rotational magnetization should be fully examined and investigated. In 2011, the vector magnetic properties and rotational core losses of amorphous alloys have been measured by Enokizono at the frequencies from 50 Hz-750 Hz which are not sufficient for high-frequency applications.. A robust control method is applied to the tester to control the magnetic flux density loci keep circular rotation up to 0.8T at 10 kHz. At last, the magnetic properties of FeSiBCuNb nanocrystalline alloys under rotational magnetization have been investigated and discussed
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