User Tools

Site Tools


magment

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Previous revision
magment [2019/06/03 18:29]
magment [2020/07/08 23:33] (current)
stan_zurek
Line 1: Line 1:
 +====== Magment ======
  
 +|< 100% >|
 +| //[[user/Stan Zurek]], **[[Magment]]** , [[http://Encyclopedia-Magnetica.com|Encyclopedia-Magnetica.com]], {accessed @YEAR@-@MONTH@-@DAY@}// |
 +
 +**Magment** (//**Mag**netic ce**ment**//) - a trade name used by the company [[Magment UG]] for a type of composite [[magnetic material]] comprising [[magnetic particle|magnetic particles]] embedded in cement (concrete) or asphalt.[(Magment_slides>[[http://magment.de/downloads/IDTechEx_IDTechExShowUSAPresentationMagment.pdf|Mauricio Esguerra, Magnetizable Concretes For Wireless Charging, IDTechEx, Santa Clara, CA, USA, 2016 {accessed 2017-01-31}]])][(Magment_products>[[http://magment.de/en/products|Magment.de / Products {accessed 2017-01-31}]])] There is a wider class of materials which can be categorised as [[magnetisable concrete]].
 +
 +{{page>insert/paypal}}
 +
 +<box 40% left #f0f0f0>
 +[[Toroidal core]] made from **Magment MC40**
 +[[file/magment_cylinder.png|{{magment_cylinder.png}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +
 +===== Internal structure and composition =====
 +
 +<box 40% right #f0f0f0>
 +Scrap [[ferrite transformer|ferrite transformers]] can be used a magnetic filler in magment
 +[[file/scrap_ferrite_transformers_magment.jpg|{{scrap_ferrite_transformers_magment.jpg}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +
 +Magment is a composite material comprising two main fractions of magnetic particles. The larger fragments can be up to around 8 mm (like "gravel") and the smaller around 2 mm (like "sand"). [(Magment_slides)][(Patent_638>[[https://google.com/patents/US6696638|Mauricio Esguerra, Ralph Lucke, Application and production of a magnetic product, Patent US6696638, 2004]])] 
 +
 +The magnetisable particles comprise up to 95% of weight, and provide appropriate [[magnetic properties]]. The cement (or asphalt) is a bonding agent.
 +
 +The magnetic particles can be used from scrapped electronic parts, for example [[ferrite core|ferrite cores]] rejected during production or sorted electronic waste[(Magment_slides)]. Ferrite material is especially useful because it provides: reasonable permeability, high corrosion resistance (it is already a form of oxide), high [[electrical resistivity]], low hysteresis loss, good stability of properties versus time, and it is fairly inexpensive to obtain or produce various particle sizes.[(MST>[[http://magment.de/downloads/MST16_MAGMENT.pdf|Ralph Lucke, Mauricio Esguerra, Magnetizable Concrete - A Composite Material Containing Ferrite Ceramics, MS&T Conference, 2016 {accessed 2016-02-09}]])]
 +
 +According to the manufacturer, a suitable typical composition of the magnetic particles would be as follows:[(MST)]
 +  * [[Fe2O3|Fe₂O₃]] 70.4%
 +  * [[MnO]] 20.4%
 +  * [[ZnO]] 6.9%
 +  * [[SiO2]] 1%
 +  * other 1.3%
 +  * //no [[nickel ferrite|nickel ferrites]] and no [[garnet|garnets]]//
 +
 +
 +===== Construction of magnetic components =====
 +
 +<box 25% right #f0f0f0>
 +Complex geometry like [[pot core]] can be made easily with magment
 +[[file/pot_core_magment_magnetica.jpg|{{pot_core_magment_magnetica.jpg}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +
 +The material is available from the manufacturer in a form of dry aggregate, pre-mixed with the specific ratio of magnetic particles and cement (similar to ready mixed concrete). Water must be added with a required ratio and mixed for instance in an ordinary cement mixer. The available processing time is around 30 min (before setting).[(Fabric>[[http://magment.de/downloads/FABRIC_MAGMENT_0216.pdf|Mauricio Esguerra, Magnetizable concretes as a competitive and road integrable solution to increase the efficiency and/or coil distance for DWPT, FABRIC Conference, Brussels, 2 Feb. 2016 {accessed 2017-02-09}]])]
 +
 +<box 25% left #f0f0f0>
 +Steel mould tool for toroidal cores
 +[[file/magment_steel_mould.png|{{magment_steel_mould.png}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +
 +The inductive component is made first by designing the magnetic circuit. The [[winding|windings]] ([[primary winding|primary]], [[secondary winding|secondary]], etc.) can be wound first and placed in the appropriate form (mould) for casting. The wet concrete can the poured around the windings. 
 +
 +Sufficient density and quality of such magnetic concrete can be achieved without additional pressure or vibration. 
 +
 +The mould can be taken off after typically less than 1 hour and the concrete is strong enough to be walked on after 6 hours. Full strength is achieved after similar time as for ordinary concrete (28 days).[(MST)]
 +
 +
 +===== Applications =====
 +
 +<box 25% right #f0f0f0>
 +[[Inductor]] made with magment
 +[[file/magment_inductor.jpg|{{magment_inductor.jpg}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +
 +According to the manufacturer, magment can be used for many applications, for example:
 +  * [[transformer|transformers]]
 +  * [[inductor|inductors]]
 +  * [[choke|chokes]]
 +  * [[EMC]] components
 +  * stationary [[wireless power transmission]] for charging electric vehicles (buses, taxis, cars)
 +  * dynamic "on-the-move" wireless power transmission (for moving cars)
 +  * [[induction heating]]
 +
 +Tests up to 30 kW stationary systems were demonstrated for wireless car charging.[([[http://magment.de/downloads/Inductive_Energy_Transfer_on_the_move.pdf|Magment, Inductive energy transfer on the move, Solutions for future mobility, Intis GmbH, 2016 {accessed 2017-02-14}]])]
 +
 +Almost unlimited magnetic component size can be produced with the concrete-like processing.
 +
 +Magment can be also used for making low-maintenance, hard-wearing surfaces (anti-vandalism). 
 +===== Technical specification =====
 +
 +^  Technical specification of Magment MC40[(Wireless>[[http://www.electronics-eetimes.com/design-center/power-magnetics-wireless-car-charging|Mauricio Esguerra, Power Magnetics for wireless car charging, Magment UG, 2016-06-03]])]  ^^^
 +|  //parameter//  |  //conditions//  |  //value// 
 +|  [[initial permeability]]  |  at 25°C  |  typically 40 ±10%  (up to 70) |
 +|  [[Curie temperature]]  |  |  > 210°C  |
 +|  [[resistivity]]  |  DC  |  20 Ω·m  |
 +|  [[density]]  |  |  3750 kg/m³  |
 +|  relative [[core loss]]  |  50 kHz, 100 mT  |  300 kW/m³  |
 +|  specific heat  |  |  700 J/(kg·K)  |
 +|  thermal conductivity  |  |  3 W/(m·K)  |
 +|  Young's modulus  |  |  25 000 MPa  |
 +|  compressive strength  |  |  20 MPa  |
 +|  tensile strength  |  |  2 MPa  |
 +
 +<WRAP>
 +<box 30% left #f0f0f0>
 +[[B-H curve]] of Magment MC40
 +[[file/magment_bh_curve.png|{{magment_bh_curve.png}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +<box 30% left #f0f0f0>
 +[[Specific core loss]] of Magment MC40
 +[[file/magment_specific_core_loss.png|{{magment_specific_core_loss.png}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +<box 30% left #f0f0f0>
 +DC bias strength for Magment MC40
 +[[file/magment_dc_bias_strength.png|{{magment_dc_bias_strength.png}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +</WRAP><WRAP clear></WRAP><WRAP>
 +<box 30% left #f0f0f0>
 +[[Inductance]] vs. DC bias for a typical 55 μH magment inductor
 +[[file/magment_55uh_60a_inductor_l.png|{{magment_55uh_60a_inductor_l.png}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +<box 30% left #f0f0f0>
 +[[Stored energy]] for 55 μH magment inductor
 +[[file/magment_55uh_60a_inductor_energy.png|{{magment_55uh_60a_inductor_energy.png}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +</WRAP><WRAP clear></WRAP>
 +
 +===== Patents and awards =====
 +
 +<box 25% right #f0f0f0>
 +Silver Award certificate 
 +[[file/magment_silver_award_2016.jpg|{{magment_silver_award_2016.jpg}}]]
 +//<sup>Copyright (c) Encyclopedia Magnetica </sup>//
 +</box>
 +
 +There are several patents related to the magnetic cement technology, for example:
 +  * [[https://www.google.com/patents/US6696638|Mauricio Esguerra, Ralph Lucke, Application and production of a magnetic product, 2004, Patent US 6696638]]
 +  * [[https://www.google.com/patents/US7011764|Mauricio Esguerra, Ralph Lucke, Method for producing a magnetic device, 2006, Patent US 7011764]]
 +
 +In 2016 the company [[Magment UG]] won Silver Technology Award for "Magnetizable Concretes'' at the Materialica trade show.
 +
 +===== Similarity to powder cores =====
 +Magment is a composite material, with certain amount of non-magnetic filling between the magnetic particles. Therefore, from a macroscopic viewpoint it behaves similarly to so called [[powder core|powder cores]], whose permeability is a function of ratio of the magnetic content to the overall volume. 
 +
 +[[Effective magnetic permeability]] of such structure is significantly lower than that of the input magnetic material, because of the [[air gap]] between the particles. 
 +
 +The [[distributed air gap]] is capable of storing considerable amount of energy, which is why such materials are especially useful for [[power choke|power chokes]] and [[inductor|inductors]] typically used in high-power [[switch-mode converter|switch-mode converters]] and power supplies.
 +
 +Because of the energy storage capability such materials are less useful for transformers. However, for devices with large physical dimensions such materials can still provide much better performance than the alternative solution - which would be normally some non-magnetic structure (like an ordinary concrete). 
 +
 +Therefore, with appropriate design [[magnetic shielding]] can be also achieved with such materials.
 +===== See also =====
 +  *[[Magment UG]]
 +  *[[powder core]]
 +
 +===== External links =====
 +
 +* [[http://magment.de]] - official website 
 +
 +===== References =====
 +~~REFNOTES~~
 +
 +{{tag> Magment Magnetisable_concrete Magnetisable_asphalt Soft_magnetic_materials Counter}}

Privacy and cookie policy (GDPR, etc.)