Judging the magnetic field performance of permanent magnets need to consider a number of aspects, mainly from the following aspects:

1, Magnetic field strength: magnetic field strength is one of the important parameters to measure the performance of permanent magnets, which indicates the magnetic field strength of permanent magnets in a specific magnetic field. The greater the magnetic field strength, the stronger the magnetic force of the permanent magnet.

2, Magnetic flux: magnetic flux is another important parameter to measure the magnetic effect of permanent magnets in a specific magnetic field. The larger the magnetic flux, the stronger the magnetic effect of permanent magnets in a specific magnetic field.

3, Magnetic permeability: magnetic permeability is a parameter that measures the ability of permanent magnets to magnetize other magnets. The higher the permeability, the stronger the permanent magnet's ability to magnetize other magnets.

4, Remanent magnetism: remanent magnetism is a measure of permanent magnets in a specific magnetic field in the residual magnetism parameter. The higher the remanent magnetism, the stronger the magnetic force left in the specific magnetic field of the permanent magnet.

The picture shown is a galvanized round neodymium magnets.

5, Coercivity: coercivity is a measure of permanent magnets in the reverse magnetic field to maintain the ability to retain the magnetic force. The higher the coercivity, the stronger the ability of permanent magnets to maintain the residual magnetic force under the action of the reverse magnetic field.

6, Temperature stability: temperature stability is a measure of permanent magnets at different temperatures to maintain the original magnetic properties of the ability. The higher the temperature stability, the stronger the ability of permanent magnets to maintain the original magnetic properties at different temperatures.

7, Corrosion resistance: corrosion resistance is a measure of permanent magnets in a corrosive environment to maintain the original magnetic properties of the ability. The higher the corrosion resistance, the stronger the ability of permanent magnets to maintain the original magnetic properties in a corrosive environment.

8, Reliability: reliability is a measure of permanent magnets in long-term use to maintain stability and reliability of the ability. The higher the reliability, the stronger the ability of permanent magnets to maintain stability and reliability in long-term use.

These metrics are often used to evaluate the performance of permanent magnet materials, and different applications require permanent magnet materials with different characteristics. For example, for motor applications, high magnetic energy product and good temperature stability are required, while for sensors, coercivity and residual magnetic induction may be of greater concern. Therefore, when selecting and evaluating the magnetic field performance of permanent magnets, these index parameters need to be considered comprehensively according to the specific application requirements.

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