The Most Popular Motor Magnets-Neo Arc Magnet

Arc segment motor magnet has advantages of easy manufacture and low cost compared with radial ring magnets. It’s still the most common motor magnet shape, especially for PM DC motor and magnet rotor.

As we all know, permanent Magnet is the core of PM motor.
In order to ensure the steadily electrical performance and long-term safe and reliable operation of electric vehicles, it requires the magnetic property of permanent magnet material remains stable. Considering magnetic performance influenced by the work environment, temperature and time, the reliability of permanent motor magnets can be divided into thermal stability, time stability, chemical stability, and magnetic stability.

rare earth magnet

1. Temperature stability can be shown by Curie temperature and the maximum operating temperature. As the temperature rises, the magnetic properties gradually reduce. When raises to a certain temperature, the magnetization disappears. This certain temperature is the Curie temperature of the permanent magnet materials, also known as the Curie point. The deficiency of NdFeB permanent magnet is relatively low Curie temperature, but higher temperature coefficient. Therefore neodymium magnets will be lost much magnetic force if work under high temperature. Due to the high-temperature coefficient of NdFeB permanent magnet, the magnetic properties are poor. To this end, it must pay more attention to Max. working temp.of sintered NeFeB magnet when you select a magnet grade. The test method of magnet temperature stability is the aging test

2. Chemical stability refers to the anti-oxidation and corrosion-resistant of permanent magnet material. Compared with the traditional ferrite or samarium cobalt (Smco) or alnico magnets, the chemical stability of sintered NdFeB magnet is the worst. Currently, the primarily solution is adding some alloy elements such as Co, Ni, Al and Cr, etc., while in the sintering process, increasing the density and reducing the porosity of magnetic material. Another approach is made certain magnet surface treatment such as electroplating. This can obtain a practical corrosion resistance for the magnet.

3. Time stability is putting the permanent magnet at a certain temperature for a long time, observing the change of its magnetic properties over time. These NdFeB permanent magnets added Co + Dy + Nb will obtain better time stability.

4. Magnetic stability is based on the magnetic material, and also affected by temperature, time, external magnetic field, chemical corrosion, radiation, mechanical vibration or shock and other factors.

Compared with electro-magnetic, we can list more advantages of segment arc motor magnet:
1. Simplify the structure of the motor
2. Easy maintenance
3. Light weight
4. Small volume
5. Operational reliability
6. low energy consumption

How to choose motor segment material?
For traditional AC motor, ferrite and AlNiCo segment magnets are most applied. With the higher request on motor power, more and more motor manufacturers use ndfeb and smco magnet which have super high magnetic energy product. However, they are more expensive because neodymium magnet and samarium cobalt magnet segments belong to rare earth magnet.

How to join neodymium arc magnets, which are diameter magnetized, to create a cylindrical ring that is radially magnetized?
The general approach is to make a sleeve or frame to put neo arc magnets in that will keep them in order and don’t jump around. The sleeve here has to be made of something sturdy and nonmagnetic, such as aluminum, copper or Q235 low carbon steel. Due to a strong repelling force, it’s better to operate by those experienced workers. If you are the first time to assemble segment magnets, just be careful. Halbach array magnets also utilize a frame or other tools to overcome the strong magnetic repulsive force between the same pole sides of two magnets and keep them fixing together.

What are the Different Shapes of Magnets?

There are probably few limits to the shapes that magnets can be formed into. The factor that determines the shape that a magnet is formed into is the desired shape of the magnetic field that comes from the magnetic poles.

Uses of Different Shaped Magnets and Strengths:
Each magnet is designed and manufactured for its use and purpose to fit in for its use and the real strength of the magnet comes from the magnetic material, each shape of the magnet have the effect on the strength of the magnet and shape of the magnet is very important and significant.

magnet shape

The most common shapes you will see are rectangular prisms, cylinders, spheres, and rings, however, there are few limits to what shapes you can have with a magnet. You can buy neodymium arc magnets, neodymium bar magnets, neodymium block magnets, neodymium cylinder magnets, neodymium disc magnets, neodymium ring magnets, square pyramid magnets, conical magnets, triangular prism magnets, heart-shaped magnets, etc.

Now, let’s see what are different shapes of magnets now in detail about shapes of magnets:
Blocks and Bars:
These blocks and bars magnets have fully with the flat surface and in shape of perpendicular to each other.
Threaded Tiny Magnets:
Threaded magnets are partial with the use of their threaded shaped through magnetic rings and wooden plates and these include countersunk holes design and threaded shape which helps in holes to perfectly fit in with the threaded shape.
Rubber Coated:
Rubber coated magnets which are used for magnet keepers and used for protection purposes, these are tiny and generate and contact with large fields and these plastic coated magnets are used against the rust without irritations.
Bar Magnets :
Bar magnets are one of the weakest magnets of all shaped magnets.
Horseshoe Magnets :
Uses of horseshoe magnets and Horseshoe magnets are just barred magnets bent in u shaped and the U shaped magnet makes stronger by bending them in U shape just pointing the poles in the same direction which makes them stronger. As it is named horseshoe it can be used to collect pins, industrial materials etc.
Disc Magnets :
Disc magnets are mainly used for holding applications where the drilled hole plays an important role and it is recessed into the hole. There are lot of things we can do with disc magnets. The use of Disc Magnets is shaped in thin flat circular magnets and its thickness does not exceed the diameter.
Cylinder Magnets:
Cylindrically shaped magnets are used as rods and used in medical treatment as well sometimes for multiple surgeries, using this shape of the magnet in human spine bone and etc. Cylindrically shaped magnets posses the high level of magnetism from relatively small surface pole area rod shape with a ball end shape.
Ring Magnets:
Ring magnets are widely used in science experiments and they are used in various daily use products like the vacuum cleaner, motors, generators etc.
Pyramid Magnets:
Pyramid magnets with its shape in pyramid help to produce and designed in a way to fabricate or generate with huge flux density with it.
Sphere Magnets :
The main use of sphere magnets is for toys, and novelty products as it is shape and structure in the sphere and the magnetic flow in shape of sphere flows from north pole on the sphere to south pole on the sphere.