strong neodymium magnet

Do magnets get stronger when combined?

Magnets can be attached or combined together for either increasing or reducing their strength, depending purely on their orientation towards each other. Combining the two equal magnets will not necessarily double their strength, but definitely it will come close.

Combining the N-to-S

If north side of the one magnet combined with south side of other, so the poles get oriented N-S-N-S, then strength will definitely be close to the double thatof the single magnet, on a condition, if they are of the same strength and the shape.

T shape neodymium magnet

T shape neodymium magnet,you can buy it from here

 

Less Than Double

As the magnets don’t take or occupy the same space so the strength will not be doubled. Although the strengths of the field are additive, field strength on top surface of combined magnet is the distance away from other magnet – namely, width of top magnet away—therefore the full effect of bottom magnet does not felt.

Combining the N-N

If two magnets are combined and the same poles are facing each other, then their strength of the magnet will be greatly reduced. Strength will not be fully canceled out, as the argument which is stated above that they does not occupy same space.

Cancellation

Anyone may expect that the combined magnets would cancel, such as the electric charges. But the magnetic fields are additive instead.

The Intuition

The magnetism can be viewed as loosely oriented as created by circles that electrons create in their orbits and if the random orientation of these orbits is occurred they will cancel the each other. But if in the same direction they all are oriented then the strength of the field is additive and their effect is cumulative.

But do magnets get stronger when combined?

Answer of this question is here! When you stack the two identical permanent magnets then you get roughly strength of the one twice the size. A magnet twice or double the size, then it has to spread its energy of magnet over twice the volume, hence the strength of the surface of magnet is significantly rarely increased. The smaller neodymium magnets which have the same rating typically roughly have the same strength of the surface as the larger ones. It is the holding power that increases, as they have the larger surface area.

If you stack or combine the two magnets such that the opposite poles are touching each other then they will behave like the single magnet of same overall height.  But if we see technically then this is not true 100%. When you stack the two magnets, actually you have little less magnetic material, as some of the plating layers you have in the middle which you are not having with single magnet. Still this is great approximation- we see hard to measure difference with pull force gauge.

In the today’s world, many the stacked magnets are being used in many of the applications and it has great usage. Let’s see forward in the future what applications of stacked magnet are more to be discovered.

neodymium magnet factory

The Terms About Magnet ,which you should know

Magnetic terms

In this post, we would like to introduce you some terms about the magnet. And that will not too difficult to understand. Most of the terms, will always be used in our daily business. so pls pay attention at this post.

Curie temperature

When the Curie temperature is reached, the magnetic material loses magnetism.

neodymium magnet factory

Working temperature

The working temperature is the highest temperature that a magnet can be exposed to without permanent magnetic loss. It is an approximate value since there is a dependency on sizing. Factors such as mechanical or chemical stress can further limit the maximum service temperature. It is very important to check the temperature because the high temperature will “kill” the magnet. It will be dead.

Energy product (B × H) max

The maximum energy product from the flux density B and the field strength H is the most important quality value of a magnetic material. The higher the energy product, the greater the magnetic energy. The larger the (B × H) max value of a magnetic material, the smaller the magnet volume required for a particular task can be, given otherwise identical conditions.

Coercive force H c

Coercive field strength is the field strength that must be used to eliminate magnetization. The higher the value, the higher the magnetization resistance. One distinguishes HcB and HcJ.

Remanence (B r )

Remanence refers to the remaining magnetization in a magnet material that has been magnetized to saturation in a closed loop. The remanence is given in Gauss (G), Tesla (T) or Millitesla (mT).

Magnetic material energy product Retention coercivity Temperature coefficient Max. Operating temperature Curie temperature density
(B × H) max kJ / m 3 r mT cB kA / m cJ kA / m per 1 ° C ° C ° C g / cm 3
Barium ferrite isotropic 7.2 – 7.6 210 – 220 130 – 135 220 -0.2% 250 450 4.9
Barium ferrite anisotropic 28.9 – 29.5 390 – 400 145 – 160 150 – 165 -0.2% 250 450 4.9
Strontium ferrite anisotropic 24.5 – 25.5 350 – 370 210-245 220 – 255 -0.2% 250 450 4.9
AINiCo 500 35 – 36 1120 – 1160 47 – 49 47 – 49 -0.02% 400 890 7.3
Samarium Cobalt SmCo5 140 – 150 850-890 620-670 1100 – 120 -0.04% 250 720 8.3
Samarium Cobalt Sm2Co17 190 – 205 1000 – 1050 680 – 750 1195 – 1500 -0.03% 250 800 8.3
Neodymium Iron Boron NdFeB N35 * 260 – 285 1180-1220 860-915 > 955 -0.13% 80 310 7.4
Neodymium Iron Boron NdFeB N48 * 358 – 392 1370 – 1410 859 – 950 > 955 -0.13% 80 310 7.4

Values determined at 20 ° C temperature. * Versions up to 220 ° C operating temperature available.

neodymium magnet and board

Magnetic board and Neodymium magnet

Magnetic boards and neodymium magnets in a simple design
It’s been a long time since people had to rely on thumbtacks in the office. The good old pinboard has long been obsolete, today is multifunctional and clearly worked with magnetic boards. It does not matter if only one sheet, eight or fifteen should adhere at once – at least if you have the right magnet at hand like the neodymium bar magnet.

An aesthetic and durable alternative
A professional working atmosphere is indispensable if productivity is to sprout up and fun in the trade should remain. While pinboards with their chaotic plug-in system are more likely to distribute information according to where the cork is not yet used, magnetic boards are an aesthetic and durable alternative.

neodymium magnet and board

Metal magnetic boards are inexpensive and powerful
With their customizable size, magnetic boards are not only suitable for meter-long walls, but also for small-scale offices or SOHO rooms. In order to increase the magnetic adhesion and counteract the Scherkarft, magnetic boards made of metal are particularly recommended. Here is the price-performance ratio, because metal magnetic boards are inexpensive to purchase and very easy to install.

Simple design instead of dangerous tacks
Although you can not deny a certain charm pinboard, after all, they are almost a symbol of the offices and youth rooms of the 80s. But the simple design in combination with the suitable and handy magnets, for example, the neodymium bar magnet, does not distract in any way from the presented content. In addition, there is no danger of hurting yourself unnecessarily and painfully with thumbtacks.

Worth knowing: Shear forces
Scissors is a lateral displacement movement. That means, if you have two buttered slices of toast lying on top of each other and you pull on the side of the top, while holding the lower one, then you’ll miss the whole thing. In this case, mainly the butter layer. The required force is just the shear force. In technology, something like that is used to test the strength of things. In addition, there is still the traction. In this case, you would pull up the top toast.

Neodymium magnets, which are easy to grasp, are particularly suitable magnets for a pin board. We therefore recommend to use bar magnets of size 7x14mm, 9x9mm or 11x11mm, as they are strong enough to hold several pieces of paper at once and are very easy to grip due to their length.

neodymium magnet

7 Factors should know if you in neodymium magnet business

Just like other business, there some knowledge have to know. Here we would like to share with you some useful knowledge about neodymium magnet. That can help you know neodymium magnet in 3 minutes.

 

Basics of neodymium magnets:

NdFeB is the most widely used magnetic material due to the highest specific energy density and low cost of production. This rare earth material is composed of the elements neodymium, iron, and boron. Magnets of NdFeB are colloquially called neodymium magnets. They are very versatile because of their properties. NdFeB magnets are permanent magnets with a given direction of magnetization (anisotropic) and behave extremely stable against demagnetizing fields.

 

Purpose of Neodymium Magnets:

  • Magnet adhesive systems
  • Generators and electric motors
  • Hall sensors (as encoder magnets)
  • filter systems
  • Pinnwände

neodymium magnet

Limitations of Neodymium Magnets:

  • The operating temperature of magnets made of neodymium is, depending on the grade, a maximum of 200 ° C, in most cases even only 80 ° C.
  • Due to the high iron content of the neodymium magnets, these tend to corrosion.
  • High sensitivity to impact or pressure load

Coatings of Neodymium Magnets:

The neodymium magnets are delivered with the following two coatings:

  • NiCuNi nickel coating (shiny metallic)
  • Zn Coating
  • Black/Grey epoxy coating

Usage notes of neodymium magnets:

Please read the warnings before using magnets. Neodymium magnets can be attached by gluing or snapping. If the neodymium magnet is attached to a magnetic object, you should make a previous test with a magnet between the magnet and the object, for example, fabric or polystyrene.

Neodymium magnets in different shapes and sizes

Neodymium magnets can be found in the form of discs, cuboids, cubes, rods , rings or balls and in different sizes. So you get the Neodymium magnets in cubic form, for example, in sizes between 1mm and 20mm.But lots of manufacturers do not like to produce the magnet smaller than 1mm, because that is hard to produce. Even the China magnet manufacturer. If you ask them, you would find that the 1mm magnet’s price is higher than the 2mm. And most of the time , they will increase the MOQ.