Ferrite Permanent Magnets for wireless charging technology 20160812

Ferrite Permanent Magnets for wireless charging technology 20160812
Ferrite Magnets Manufacturer China Rare Earth Magnet Limited
Recently, NDRC and NEA compiled and issued the plan of energy and technology innovation, which arranged 15 important tasks of grid technology, including wireless charging technology. On present, there are two main applications of wireless charging technology: electronics industry and the electric vehicle industry. Since 2015, Apple and Samsung have launched wireless charging phone, and the rise of electric automobile also create great market for wireless charging.

The advancement of wireless charging chain will help to boost the development of relevant material field. The main parts of wireless charging device are IC, the transmission coil, magnetic boards and modules, so the raw material ferrites of magnetic boards will benefit a lot. The wireless charging devices have some disadvantages of low charging efficiency and large heat, so to avoid these shortcomings, the main solution is to add magnetic boards on the transmitting end and the receiving end of the device. And ferrite magnets are the raw material of the magnetic board, it is a ferromagnetic metal oxide. Due to its high permeability when it is in high frequency, the ferrite has become nonmetallic magnetic materials in a wide range of a high-frequency weak field.

In accordance with the different placement of receiving end, wireless charging transmitter divided into fixed position type, single coil-free location and multiple coil-free location. And these transmitters require different ferrites. The first kind needs to neodymium-iron-boron permanent magnet sheet to make the receiving end in a fixed position, so that to achieve the maximum charging efficiency. The second kind needs high reliability of the magnetic board for the coil has to move, so it always uses flexible magnetic sheets. As for the third kind, it uses MnZn material of high Bs and low loss.



Tags: ferrite magnets, permanent magnet

Permanent Magnets Become Batteries 20160801

Permanent Magnets Become Batteries 20160801
Magnet Manufacturer China Rare Earth Magnet Limited

Magnets become batteries and the bacteria can produce electricity.

Abstract: it is shocking that the researches have found that bacteria live on the tiny particles of the permanent magnets. They form into a group and can swallow and absorb the electrons. In recent years, this kind of bacteria has become a hot topic. Scientists have found that some bacteria form the deep sea and rivers can get electrons from the tiny metallic particles, through providing the electrons, iron particles become strong source for the effective power. Other kind of bacteria gets electrons through putting extra electrons to the metallic particles.



Nowadays, James Byrne and his colleagues from Tubingen university of Germany find that normal minerals ---tiny magnetite crystals can take the role of both the receiver and the provider of the electrons so as to work as batteries. He grow the bacillus sp. and the pseudomonas sp. bacteria on the permanent magnets and he finds that the bacillus sp is able to give the electrons to the crystals and the pseudomonas sp. Bacteria can get electrons from the crystals.

Tags: Permanent Magnets

T Yoke for Speaker 20160729

T Yoke for Speaker 20160729
Permanent Magnet Manufacturer China Rare Earth Magnet Limited supply T Yokes

As we all know, there is a magnetic circuit in the speaker. And it is consist of concentrating flux plate, magnetic conductor named T yoke and permanent magnets. There are always three kinds of magnets used in the speaker. The most common is the ferrite ring magnets . The magnetic permeability can up to thousand, and the resistivity is 1011times compared with metal, so it is suit for electromagnetic devices of high frequency. The second kind is neodymium magnet which the magnetism is 7 times to ferrite magnet. But it is not stable and easy to demagnetizing. The third kind is strontium. The efficiency of it is high while the size of it is too large, so it only suit for high-pitched speaker.

The concentrating flux plate and T yoke work together to form a steady magnetic gap, which the permanent magnet  produce a static magnetic field with certain magnetic destiny. What’s more, the concentrating flux plate and t yoke will provide a magnetic circuit for the magnetic field.

T Yoke is also referred to as electric iron, which is made of pure iron. Being an important component of sound equipment, the main function of T Yoke is to conduct magnetism when electric power is turned on. But there is no residual magnetism in T yoke. Magnetic field disappears when electric power is off, and the magnetism in T yoke also disappears. Therefore, the iron purity of T yoke directly affects the function and certain important parameters of nonlinear distortion of sound equipment.

T yoke is the base and one of the most important parts of speaker. The quality of speaker depends on the quality of T yoke in it. Carbon content and plasticity are the two key factors that affect the quality of T yoke. Higher carbon content renders poor tone quality.

 

Application of T yoke:
T yoke is mainly applied in sound equipment including home audio loudspeaker, Neodymium Sub-Woofer, Car loudspeaker, Siren alarm, Horn Speaker, Tweeter and so on.

Material of T yoke
T yoke is made of Low carbon content steel which features excellent performance in magnetism conduction

Coating of T yoke
T yoke requires anti corrosion and oxidation surface treatment. Coatings of T yoke include: blue Zinc, Ni, Chromium and so on

Dimension
Diameter of Piece: 28mm up to 150mm
Diameter of Pole : 10mm up to 70mm
Length of Pole : 6mm up to 80mm

Package method
T yokes are conventionally packed in PVC bags, and put into cardboard carton. Since the transportation mode of T yoke is usually sea shipment, wooden pallet with waterproof plastic film will be built before shipment. 

With the current extremely low price of steel material in China, steel products such as T yoke take absolute leading edges in pricing. If you are interested in T yoke, do not hesitate to make inquiry and email us with your engineering drawing.

Tags: T yoke, Permanent Magnet

Permanent Magnets for Self-driving Cars 20160726

Permanent Magnets for Self-driving Cars 20160726
Neodymium Permanent Magnet Manufacturer China Rare Earth Magnet Limited

Volvo has been paying attention to the development of self-driving cars, however, they’ve made new progresses recently, namely ties the cars to the road using permanent magnets . For the self-driving cars, the most important part is if people can drive with them safely on the road.

 

There are two ways: GPS and the camera. The former one is limited by the place and the later one is limited by the visibility. Therefore, Volvo comes up with the idea of laying a track using magnets on the road to help define the road range for the cars.

The researchers say that the advantage of the permanent magnet track is that it is relatively cheaper and will not cause great effect on the current infrastructure, besides, magnets work in any bad weathers and this kind of stability is what the self-driving cars need.

It is said that Sweden is interested in the magnet road plan and the officials in the traffic administrative department say that the large-scale spread of the magnet road will be one of the top technology of Sweden.

Custom Permanent Magnets 20160721

Custom Permanent Magnets 20160721
N35SH NdFeB Neodymium Arc and Ring Magnets


Inquire N35SH Permanent Magnet:

We are looking for magnets for our new system. Please see below the specification.

Could you please send me your best price?

Nd-Fe-B (Grade: N35SH): Br=12kGs, Hc=13kOe, Hz=10.55kOe; T=150˚C

Neodymium Magnet Manufacturer China Rare Earth Magnet Limited:
Could you please advice the detailed dimensions you need of the N35SH magnets?
Upon the receipt of your reply, we will send you prices as soon as possible.

Inquire Arc & Ring Magnets:
I'm sending you the specification with pictures and sketches of our system and magnets.
Could you please send me you best quote for NdFeB permanent magnets?
Small question: What thickness of coating will be provided?
Another question: Could you please let me know if you can assemble this system and what does it cost?

Magnets Pictures:
There are no pictures and sketches attached to your email.
Could you please send them again?
---Sorry, please see attached in jpg




Custom Magnets Manufacturer China Rare Earth Magnet Limited:
Thank you very much for your documents.
They are very clear.
Could you please also specify the quantity you need for both the ring2 and ring 1/3?
Our price will be based on quantity.

Quantity:
Please send me the separately 2 quote for:
The first sample for magnet system (3 rings with magnets) for ***pcs
The magnets for ***pcs

Permanent Magnets Manufacturer China Rare Earth Magnet Limited:
Please check the following quotation:
N35SH neodymium magnets, Sizes as per drawings, NiCuNi, Magnetized, as per Drawing
Ex works Shenzhen USD***/pc
The technician team suggests that you purchase magnets only and assemble them into the plastic housing after receiving them, because magnets might fall apart during transportation process is we supplied assembled systems to you.

permanent magnet: AlNiCo Magnets 20160705

permanent magnet: AlNiCo Magnets 20160705: AlNiCo Magnets 20160705 Cast or Sintered AlNiCo Permanent Magnets China Rare Earth Magnet Limited supplies all kinds of alnico permanent m...

AlNiCo Magnets 20160705

AlNiCo Magnets 20160705
Cast or Sintered AlNiCo Permanent Magnets

China Rare Earth Magnet Limited supplies all kinds of alnico permanent magnets

We'd like to introduce the main features of alnico magnet.

The change of the magnetism of alnico magnet with the temperature change is very small.

They are still widely used in instruments and meters, electrical machinery products and permanent magnet devices which have requirements of high temperature stability, particularly suitable for torpedoes, missiles, aircraft and other weapons and equipments used in spacecraft and satellites, etc. The residual magnetic flux density of this material is relatively higher, up to 1.35 T, but their intrinsic coercive force is very low, typically less than 160 kA/m, its demagnetization curve is nonlinear variation, and the recoil line of alnico is misalignment with the demagnetization curve, so during the magnetic circuit design and manufacture of the device, we should pay special attention to its particularity, the treatment of the magnetism stability of permanent magnet must be proceeded in advance. According to the low coercive force characteristics of alnico, it is strictly prohibited in contact with any of the ferromagnetic material in use, so as not to cause irreversible demagnetization of local or distortion of the distribution of magnetic flux density. In addition, in order to strengthen its ability of resistance to demagnetization, the magnetic pole faces of Alnico rare earth magnets are often designed in shape of cylinder or long bar.

Moreover, alnico magnets are low in mechanical strength, high in hardness, brittle in material and poor in machinability, therefore they cannot be used as structure design, a bit of grinding or electro sparking are allowed in processing, and the forging and other machining cannot be adopted.

 Alnico permanent magnet is one of the first widely used magnetic materials, the preparation technology and manufacturing technology is comparative mature.

The following table shows the commonly used grade and the main magnetic properties of domestic produced alnico material.

The outstanding features of alnico magnetic material are listed as follows:
(1) temperature coefficient is small, the remanent magnetization reversible temperature coefficient alpha Br was only about 0.02% / ℃ or so, coercive force reversible temperature coefficient is about + 0.015% / ℃;
(2) Superior corrosion resistance ability;
(3) The Curie temperature as high as 860 ℃, and the applicable temperature is up to 550 ℃.