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Introduction of Neodymium Magnet Grades from Weizhong Magnetics

Time:2024-4-12 Edit:WZ Magnetics

Neodymium magnets, also known as Neodymium-Iron-Boron (NdFeB) magnets, are renowned for their incredible strength and versatility in various applications, from electronics to renewable energy. One crucial aspect that distinguishes neodymium magnets is the most commonly used classification system, denoted by the “N-rating.” In this article, we delve into the classifications of neodymium magnet grades, shedding light on the differences and applications of N52, N42, and N35 magnets.

Introduction of Neodymium Magnet Grades from Weizhong Magnetics

Principal Magnetic Properties

There are four main indicators for measuring the performance of permanent magnets:

1)Remanence (Br):

Remanence, often denoted as Br, refers to the residual magnetic flux density retained by a magnet when the external magnetic field is removed. It indicates the magnet’s ability to maintain magnetization.

2)Coercivity (Hcb):

Coercivity, represented as bHc, is the measure of the magnetic field strength required to reduce the magnetization of a magnet to zero. It reflects the magnet’s resistance to demagnetization.

3)Intrinsic Coercivity (Hcj):

Intrinsic coercivity, sometimes abbreviated as iHc, is similar to coercivity but specifically refers to the resistance of a magnet to demagnetization within its intrinsic structure, without the influence of external factors. The intrinsic coercivity is closely related to the temperature resistance of rare earth permanent magnets, higher intrinsic coercivity higher working temperature.

4)Maximum Magnetic Energy Product (BHmax):

The maximum magnetic energy product, often denoted as (BH)max, is the product of remanence (Br) and coercivity (bHc). It quantifies the maximum amount of magnetic energy that a magnet can store per unit volume, indicating its overall magnetic strength and performance potential.

Introduction of Neodymium Magnet Grades from Weizhong Magnetics

Understanding the N-Rating

The “N-rating” of neodymium magnets refers to the grade or strength of the magnet. It is followed by a number, such as N52, N42, or N35, indicating the maximum energy product (BHmax) of the magnet material in mega-Gauss-oersteds (MGOe). The higher the number, the stronger the magnet. For example, an N52 magnet has a maximum energy product of approximately 52 MGOe, and an N35 magnet has a maximum energy product of approximately 35 MGOe.

Introduction of Neodymium Magnet Grades from Weizhong Magnetics

The “N-rating” of neodymium magnets also refers to the maximum working temperature of the magnet with letter suffix, such as N35M, N35H, N35SH, N35UH, N35EH, N35AH. If no suffix like N35, then it means maximum working temperature 80℃.

Max working temperature80℃100℃120℃150℃180℃200℃250℃
GradeNormalMediumHighSuper HighUltra HighExtremely HighAtmost High
Hcj12 KOe14 KOe17 KOe20 KOe25 KOe30 KOe35 KOe

Different Grades, Different Strengths, Different Temperatures

1. N52 Magnets:

These magnets represent the highest grade commercially available, boasting exceptional magnetic strength. With a maximum energy product of around 52 MGOe, N52 magnets are sought after for applications requiring maximum performance and efficiency. N52 highlights their use in motors, generators, and magnetic couplings, where superior strength is paramount.

2. N42 Magnets:

Falling slightly below N52 in terms of strength, N42 magnets are still considered high-grade magnets with a maximum energy product of approximately 42 MGOe. Despite being slightly less powerful than N52 magnets, they are widely utilized in various industries, including electronics, healthcare, and automotive, etc.

3. N35 Magnets:

While not as powerful as N52 or N42 magnets, N35 magnets are still formidable with a maximum energy product of around 35 MGOe. They find applications in consumer electronics, magnetic therapy products, and magnetic closures, offering a balance between strength and cost-effectiveness.

What should not be neglected is, Either high Remanence Br (high strength) or high Coercivity Hc (high working temperature) is high-grade magnets, for example, both N52 and N35EH (200℃) are high-grade magnets. And the current technology is not possible for a grade like N52EH.

Choosing the Right Grade

Selecting the appropriate neodymium magnet grade depends on the specific requirements of the application. Factors such as required magnetic strength, operating conditions, and budget considerations play a crucial role in determining the ideal grade.

In conclusion, the classification of neodymium magnet grades provides valuable insight into their strength and suitability for different applications. Whether it’s the unparalleled strength of N52 magnets, the versatile performance of N42 magnets, or the cost-effective solution of N35 magnets, understanding these grades empowers engineers and manufacturers to make informed decisions when selecting magnets for their projects.

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This article aims to provide a comprehensive overview of neodymium magnet grades and their applications based on the provided references.

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