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Technical Questions

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Technical Questions

Technical Questions

Q

Is it difficult to re-magnetize?

A

Depending on the cause of the demagnetization and the duration of the condition, it is possible to repurpose the magnetic material and restore the lost magnetism. One method for restoring the permanent magnet is to use a solenoid. When current is activated through the coiled wire of the solenoid, it may be sufficient to restore the magnetic field of the magnet. The demagnetization can adversely affect the function of the magnet and the use of the magnet as a component. Therefore, it is very important to identify and design magnetic components to avoid physical conditions that may demagnetize.

Q

How is the magnetism of permanent magnet materials produced?

A

Permanent magnetic materials, that is, materials that can maintain magnetism for a long time, are also called hard magnetic materials. It is characterized by high coercivity, large remanence and large area of hysteresis loop. Permanent magnet materials are divided into ferrite permanent magnet materials and alloy permanent magnet materials. The most common type of ferrite permanent magnetic material is the magnet (Fe3O4) that is directly available in nature. Alloy permanent magnet materials include the first to mass-produced permanent magnet quenched martensitic steel and rare earth permanent magnet materials. The three generations of rare earth permanent magnet materials are SmCo5, Sm2Co17 and Nd2Fe14B respectively.

Q

What are the factors that affect the magnetic force of NdFeB magnets?

A

The ambient temperature of the NdFeB magnet, because the sintered NdFeB magnet is extremely sensitive to the working temperature, the instantaneous maximum temperature and continuous maximum temperature of the environment may produce different degrees of demagnetization of the magnet, including reversible and irreversible, recoverable and non-recoverable

Q

The reason of affecting the magnetic force of NdFeB

A

The existence of alternating magnetic field of NdFeB magnet, people who have a certain understanding of the magnet know that the magnet is divided into N,S pole or multi pole. If there is another magnetic field influence around the NdFeB magnet, it will cancel part of the magnetic force of the magnet. This is also said in the use of temperature range will also be demagnetization.

Q

What is the effect of mechanical vibration of NdFeB magnets

A

The mechanical vibration of the NdFeB magnet is related to the assembly to a certain extent. The magnet rubs against the product during the assembly process. Because the material characteristic of the NdFeB magnet is fragile, the body wears and the size becomes smaller. Thus the magnet will slowly weaken.

Q

Causes of magnet demagnetization

A

Magnetization or degaussing after magnet injection molding, the minimum temperature resistance of NdFeB N series is 80 ℃, and sometimes injection molding is basically above 120 ℃, so short injection molding of 2 seconds to 3 seconds may cause partial demagnetization imagination.

Q

The magnet material contains too many impurities, resulting in weak magnetic

A

This is the common result of most greedy buyers. Because the quotation is more than three, pick the manufacturer with the lower quotation. Clearly, the customer's request is to use the N35 brand, the results of the low price of the bad manufacturers on the use of N28, N33 materials, customers do not expect to be able to detect, if the amount of 30K, do you use a magnetic flux meter to slowly measure it? (short 6 months to appear demagnetization, fast two months to appear demagnetization), a reliable and stable supplier is really important. Without that price, how can you make it with N35 materials?

Q

Resultive demagnetization of magnet due to impact

A

Strong magnets in the use of the process will often encounter magnetic weakening or disappearance of the situation is often occurred, such as high frequency impact, in the process of transport to be particularly careful.

Q

How to degaussing

A

High temperatures can demagnetize the magnet.

Q

Causes of degaussing

A

After hot pressing magnet degaussing, often using glass fiber plate hot pressing, temperature above 150 DEG C.
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SAF Coolest v1.2 设置面板IGJSX-AVRP-VSAAE-ZFZ

图片ALT信息： Dongguan Yong Magnetic Magnetoelectric Co., Ltd.

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