Remagnetization Core Losses In The Massive Amorphous FeCoYb Alloy

2017 ◽  
Vol 68 (4) ◽  
pp. 698-700
Author(s):  
Katarzyna Bloch ◽  
Marcin Nabialek ◽  
Konrad Gruszka
Keyword(s):  
Magnetic Field ◽  
Amorphous Alloy ◽  
Power Loss ◽  
Eddy Currents ◽  
Magnetic Hysteresis ◽  
Bulk Amorphous Alloy ◽  
Field Frequency ◽  
Magnetic Field Frequency ◽  
Core Losses ◽  
Additional Losses

In this paper were studied the influence of magnetic field frequency and induction on the total core power loss � which is divided into eddy current loss, hysteresis loss and anomally losses of the bulk amorphous alloy. The total core power loss of the investigated bulk amorphous alloy increases with magnetic field frequency and peak induction. It follows a power relation similar to what has been observed in classical ribbons. In the investigated alloy in addition to losses due to magnetic hysteresis and eddy currents, other additional losses are present. However additional losses, emerging simultaneously to the component associated with migration relaxations are very weakly dependent on the frequency and temperature.

scholarly journals On the Eddy Current Losses in Metallic Towers

2020 ◽  
Vol 9 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Ibrahim Mahariq ◽  
Svetlana Beryozkina ◽  
Huda Mohammed ◽  
Hamza Kurt
Keyword(s):  
Magnetic Field ◽  
Transmission Lines ◽  
Power Loss ◽  
Eddy Currents ◽  
Low Voltage ◽  
Power Network ◽  
Geometrical Structures ◽  
Proposed Model ◽  
New Type ◽  
First Time

The existence of magnetic field around high-voltage overhead transmission lines or low-voltage distribution lines is a known fact and well-studied in the literature. However, the interaction of this magnetic field either with transmission or distribution towers has not been investigated. Noteworthy it is to remember that this field is time-varying with a frequency of 50 Hz or 60 Hz depending on the country. In this paper, we studied for the first time the eddy currents in towers which are made of metals. As the geometrical structures of towers are extremely complex to model, we provide a simple approach based on principles of electromagnetism in order to verify the existence of power loss in the form of eddy currents. The frequency-domain finite difference method is adapted in the current study for simulating the proposed model. The importance of such a study is the addition of a new type of power loss to the power network due to the fact that some towers are made of relatively conductive materials.©2020. CBIORE-IJRED. All rights reserved

scholarly journals A Rapid Thermal Nanoimprint Apparatus through Induction Heating of Nickel Mold

Micromachines ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 334 ◽  
Author(s):  
Xinxin Fu ◽  
Qian Chen ◽  
Xinyu Chen ◽  
Liang Zhang ◽  
Aibin Yang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Cooling Rate ◽  
Induction Heating ◽  
Nanoimprint Lithography ◽  
High Speed ◽  
Eddy Currents ◽  
Magnetic Hysteresis ◽  
Alternating Magnetic Field ◽  
Polymer Materials ◽  
Heating And Cooling

Thermal nanoimprint lithography is playing a vital role in fabricating micro/nanostructures on polymer materials by the advantages of low cost, high throughput, and high resolution. However, a typical thermal nanoimprint process usually takes tens of minutes due to the relatively low heating and cooling rate in the thermal imprint cycle. In this study, we developed an induction heating apparatus for the thermal imprint with a mold made of ferromagnetic material, nickel. By applying an external high-frequency alternating magnetic field, heat was generated by the eddy currents and magnetic hysteresis losses of the ferromagnetic nickel mold at high speed. Once the external alternating magnetic field was cut off, the system would cool down fast owe to the small thermal capacity of the nickel mold; thus, providing a high heating and cooling rate for the thermal nanoimprint process. In this paper, nanostructures were successfully replicated onto polymer sheets with the scale of 4-inch diameter within 5 min.

Controllability of a Magnetorheological Fluid Squeeze Film Damper under Sinusoidal Magnetic Field

2007 ◽  
Vol 334-335 ◽  
pp. 1089-1092 ◽  
Author(s):  
Chang Sheng Zhu
Keyword(s):  
Magnetic Field ◽  
Squeeze Film ◽  
Field Frequency ◽  
Mr Fluid ◽  
Magnetic Field Frequency ◽  
Squeeze Film Damper ◽  
Fluid Damper ◽  
Sinusoidal Magnetic Field ◽  
Mr Fluid Damper ◽  
The Magnetic Field

The controllability of a magnetorheological(MR) fluid squeeze film damper under a sinusoidal magnetic field was experimentally studied on a flexible rotor. It is shown that the frequency of the excitation magnetic field has a great effect on the controllability of the MR fluid damper. As the magnetic field frequency increases, the controllability of the MR fluid damper significantly reduces. There is a maximum frequency of the magnetic field for a given magnetic field strength or a minimum strength of the magnetic field for a given magnetic field frequency to make the dynamic behavior of the MR damper be controllable. When the magnetic field frequency is over the maximum one or the magnetic field strength is less than the minimum one, the controllability of the MR fluid damper almost completely disappears and the dynamic behavior of the MR fluid damper with the sinusoidal magnetic field is the same as that without the magnetic field.

scholarly journals Hall-Effect Sensor Technique for No Induced Voltage in AC Magnetic Field Measurements Without Current Spinning

2021 ◽  
Author(s):  
Anand Lalwani ◽  
Ananth Saran Yalamarthy ◽  
Debbie Senesky ◽  
Maximillian Holliday ◽  
Hannah Alpert
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Hall Effect ◽  
Induced Voltage ◽  
Field Frequency ◽  
Magnetic Field Frequency ◽  
Ac Magnetic Field ◽  
Hall Effect Sensor ◽  
Offset Voltage ◽  
The Magnetic Field

Accurately sensing AC magnetic field signatures poses a series of challenges to commonly used Hall-effect sensors. In particular, induced voltage and lack of high-frequency spinning methods are bottlenecks in the measurement of AC magnetic fields. We describe a magnetic field measurement technique that can be implemented in two ways: 1) the current driving the Hall-effect sensor is oscillating at the same frequency as the magnetic field, and the signal is measured at the second harmonic of the magnetic field frequency, and 2) the frequency of the driving current is preset, and the measured frequency is the magnetic field frequency plus the frequency of the current. This method has potential advantages over traditional means of measuring AC magnetic fields used in power systems (e.g., motors, inverters), as it can reduce the components needed (subsequently reducing the overall cost and size) and is not frequency bandwidth limited by current spinning. The sensing technique produces no induced voltage and results in a low offset, thus preserving accuracy and precision in measurements. Experimentally, we have shown offset voltage values between 8 and 27 μT at frequencies ranging from 100 Hz to 1 kHz, validating the potential of this technique in both cases

scholarly journals Hall-Effect Sensor Technique for No Induced Voltage in AC Magnetic Field Measurements Without Current Spinning

2021 ◽  
Author(s):  
Anand Lalwani ◽  
Ananth Saran Yalamarthy ◽  
Debbie Senesky ◽  
Maximillian Holliday ◽  
Hannah Alpert
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Hall Effect ◽  
Induced Voltage ◽  
Field Frequency ◽  
Magnetic Field Frequency ◽  
Ac Magnetic Field ◽  
Hall Effect Sensor ◽  
Offset Voltage ◽  
The Magnetic Field

Accurately sensing AC magnetic field signatures poses a series of challenges to commonly used Hall-effect sensors. In particular, induced voltage and lack of high-frequency spinning methods are bottlenecks in the measurement of AC magnetic fields. We describe a magnetic field measurement technique that can be implemented in two ways: 1) the current driving the Hall-effect sensor is oscillating at the same frequency as the magnetic field, and the signal is measured at the second harmonic of the magnetic field frequency, and 2) the frequency of the driving current is preset, and the measured frequency is the magnetic field frequency plus the frequency of the current. This method has potential advantages over traditional means of measuring AC magnetic fields used in power systems (e.g., motors, inverters), as it can reduce the components needed (subsequently reducing the overall cost and size) and is not frequency bandwidth limited by current spinning. The sensing technique produces no induced voltage and results in a low offset, thus preserving accuracy and precision in measurements. Experimentally, we have shown offset voltage values between 8 and 27 μT at frequencies ranging from 100 Hz to 1 kHz, validating the potential of this technique in both cases

The Effect of Magnetic Field on Magnetotactic Bacteria Behaviors

2008 ◽  
Vol 57 ◽  
pp. 61-66
Author(s):  
Hideharu Takahashi ◽  
Hiroshige Kikura ◽  
Tat Suo Iwasa ◽  
Shingo Watanabe ◽  
Masanori Aritomi
Keyword(s):  
Magnetic Field ◽  
Magnetotactic Bacteria ◽  
Behavior Control ◽  
Field Frequency ◽  
Magnetic Field Frequency ◽  
Video Cameras ◽  
Image Processing Techniques ◽  
Darkfield Microscopy ◽  
Processing Techniques ◽  
Observation Results

The motion of magnetotactic bacteria was observed using an optical darkfield microscopy. The images were taken using video cameras, and measured by image processing techniques. In our experiment, it was found that the bacteria motion was found to follow to magnetic field frequency within some range. The observation results indicate the possibility of the bacteria behavior control by magnetic field.

Influence of the ac magnetic field frequency on the magnetoimpedance of amorphous wire

2006 ◽  
Vol 39 (9) ◽  
pp. 1718-1723 ◽  
Author(s):  
A P Chen ◽  
C García ◽  
A Zhukov ◽  
L Domínguez ◽  
J M Blanco ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Amorphous Wire ◽  
Field Frequency ◽  
Magnetic Field Frequency ◽  
Ac Magnetic Field

Effect of magnetic field frequency on the shape of GMAW welding arc and weld microstructure properties

2019 ◽  
Vol 6 (8) ◽  
pp. 0865e5 ◽  
Author(s):  
Zi Qi Guan ◽  
Hong Xu Zhang ◽  
Xiao Guang Liu ◽  
Alexandr Babkin ◽  
Yun Long Chang
Keyword(s):  
Magnetic Field ◽  
Field Frequency ◽  
Magnetic Field Frequency ◽  
Weld Microstructure ◽  
Welding Arc ◽  
Gmaw Welding
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