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How to consider the specifications and types of magnets

When choosing NdFeB magnets, customers should choose the magnet trademark suitable for them according to their working temperature. If the working temperature is higher than the...

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The world's neodymium iron boron industry is shifting towards China

Neodymium iron boron, as the third generation rare earth permanent magnet material, has a high performance price ratio and is widely used in industries such as energy, transportation, machinery, medical, IT, home appliances, etc. Especially with the development of knowledge economy represented by information technology, it continuously brings new uses to functional materials such as rare earth permanent magnet neodymium iron boron industry, which brings broader market prospects for the neodymium iron boron industry.At present, China has become the world's center for manufacturing neodymium iron boron permanent magnets. China has currently formed its own neodymium iron boron industry system, relying on resource and cost advantages, and the industry is developing rapidly. In 2003, the production accounted for over 50% of the world's production, and the world's neodymium iron boron industry is shifting to China.In addition, the global manufacturing industry is currently shifti

07

2023-08

Three magnetization methods

1. The first type of magnetization belongs to open circuit magnetization. Due to the absence of an external magnetic field circuit during magnetization and the absence of a closed circuit, the magnetization of the magnetic tile is not easy to saturate, which has an impact on the magnetic flux density of the tile. Generally, it is lower than closed circuit magnetization;2. The second type of magnetization is the most commonly used, which belongs to closed circuit magnetization. The magnetic flux density after magnetization is also the highest, and the waveform of the air gap magnetic density can be adjusted by the shape of the magnetization head to meet the requirements of different motor performance. However, during motor assembly, special tools need to be used for assembly, otherwise the rotor may be damaged or the magnetic tile may be broken due to magnetic attraction;3. The third magnetization method also belongs to closed circuit magnetization (because the rotor lamination is a goo

03

2023-08

Three commonly used magnetization methods for magnetic tiles

1. Magnetize the magnetic tile separately, then install it into the casing, and then assemble it as a whole;2. Install the magnetic tile into the casing (stick it), then magnetize it, and then assemble it as a whole;3. Install the magnetic tile into the casing (glued), then assemble the finished product, and finally magnetize the entire body.The impact of different methods on magnetic tile magnetization:1. The first magnetization method is about 10% lower than the second and third magnetization methods in terms of surface remanence, and generally speaking, using the second magnetization method is more reasonable;2. The first method of magnetization is very convenient. Some factories use solenoid tunnel magnetization, which has high production efficiency;3. The second method of magnetization is that some factories use external flushing, while others use internal flushing. The magnetic tiles or rings need to be glued and dried first, which is also very convenient in production;4. The thi

03

2023-08

Magnetic tile usage

Magnetic pads are mainly used in permanent magnet DC motors, unlike electromagnetic motors that generate a magnetic potential source through excitation coils. Permanent magnet motors use permanent magnet materials to generate a constant magnetic potential source. Permanent magnet pads instead of electric excitation have many advantages, such as simple motor structure, convenient maintenance, light weight, small volume, reliable use, low copper consumption, low energy consumption, etc.The Effect of Magnetic Pad Performance on Electric Motors(1) High residual Magnetic flux density Br. Because under the same magnetic pole surface area and air gap, high Br can generate large output torque and power. Electric motors only have high efficiency.(2) High Hcb. Because the Hcb is high, it is necessary to ensure the required electromotive force for the motor output, so that the motor's working point is close to the maximum magnetic energy product, fully utilizing the ability of the magnet.(3)

03

2023-08

High-temperature superconductivity coil

The High-temperature superconductivity coil can not only be used as the winding of the device, but also can directly form a magnet, and can also be used as an inductor. Superconducting magnets generally refer to superconducting coils wound with superconducting wires that can generate strong magnetic fields. As devices, they also include low-temperature constant temperature containers necessary for their operation. Superconducting magnets have significant advantages over ordinary permanent magnets and conventional wire electromagnets. The magnetic field near the poles of a general permanent magnet is within a few thousand Gauss, and it is very difficult to increase its magnetic field strength. An electromagnet is a magnet made by wrapping insulated copper or aluminum wire around an iron core. When generating a strong magnetic field, it generates high temperature and emits huge heat due to the need to apply a large amount of current to the coil. Due to the resistance of magnets and magne

02

2023-08

Superconducting magnet energy storage

The application of superconducting magnet energy storage in power systems was first proposed by Ferrier in 1969. The initial idea was to meet the needs of regulating load changes in the French power system. In the 1970s, making a superconducting coil was easier than making a power electronic device. In 1974, Los Alamos National Laboratory developed the first operational superconducting magnet energy storage system with three-phase inverter. The principle of superconducting magnet energy storage is to use the magnetic field generated by the DC current of the superconducting coil to store energy. In order to reduce energy loss, the energy storage coil needs to be made of superconducting material and immersed in liquid nitrogen or helium. The key technology of superconducting coils is their manufacturing and cooling.Because there is no need for energy conversion, superconducting magnet energy storage has good dynamic characteristics compared to mechanical energy storage devices, with a re

02

2023-08
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