How to Measure Neodymium Magnet Strength?

Neodymium magnets, commonly known as NdFeB magnets, benefit from the combination of neodymium, iron, and boron which make them one of the strongest permanent magnets. So how do we measure the strength of a neodymium magnet? This article will guide you through the basics of magnetic field strength, how to interpret magnet strength ratings, and the methods used to measure the strength of neodymium magnets.

What is magnet strength?

The strength of a magnet, often referred to as its “magnetic field strength” or “magnetic flux density,” is a measure of the total force exerted by the magnet on a ferromagnetic material such as iron, cobalt, nickel, or other magnets. This intensity is measured in units of Tesla (T) or Gauss (G), with 1 Tesla equal to 10,000 Gauss. A magnet’s magnetic field strength depends on factors such as its size, shape, and the material it’s made of.

What is magnet strength grade?

The strength of magnets is often expressed using a grading system called “magnetic rating” or “magnet grade.” Neodymium magnets are graded according to their maximum magnetic energy product, expressed as (BH)max, measured in megagauss Oersteds (MGOe). This value represents the density of magnetic energy in the magnet. It provides a measure of magnet strength – the higher the number, the stronger the magnet.

For neodymium magnets, which are widely used due to their superior magnetic strength, the grading system usually consists of a series of alphanumeric characters. The most common format for neodymium magnet grades is “N” followed by a number. For example, “N48” or N52“. Common grades of neodymium magnets range from N35 to N52. A magnet rated N52 will be one of the strongest magnets available.

Here is a brief explanation of what these levels mean:

  • N: Indicates the magnet is made of neodymium.
  • Number: represents the maximum magnetic energy product (BHmax) of the magnet material. This value is a measure of the magnet’s strength. The higher the number, the stronger the magnet. For example, N52 magnets are stronger than N42 magnets.

In addition to the “N” grade, there are other grading systems for magnets, such as “M” for samarium cobalt magnets and “B” for ferrite magnets.

How to measure neodymium magnet strength?

Measuring the strength of a neodymium magnet can be approached in several ways, depending on the level of precision required and the resources available. Here are some common methods:

1. Using a Gaussmeter

A Gaussmeter, equipped with a Hall effect sensor, is one of the most direct tools for measuring the surface field strength of a magnet. This device can provide a reading in Gauss or Tesla and is highly accurate. To use a Gaussmeter:

  • Place the sensor on the surface of the magnet.
  • Zero the device to ensure an accurate reading.
  • Measure at various points to get an average strength if needed.

2. Pull Test

The pull test is a practical method to measure how much weight a magnet can hold when in direct contact with a ferromagnetic material. This test is less about measuring the magnetic field and more about assessing the functional strength of the magnet in real-world applications.

  • Attach a flat ferrous plate to a digital scale.
  • Place the magnet on the plate.
  • Gradually pull the magnet away from the plate until it detaches.
  • Record the peak weight shown on the scale, which indicates the magnet’s pull force.

3. Permeameter

For those requiring highly accurate and scientific measurements, a permeameter, which measures the magnetic flux of a magnet, can be used. This device is typically used in laboratory settings and can provide detailed information about a magnet’s properties.

Measuring the strength of neodymium magnets is crucial for you to select the ideal neodymium magnet and ensure that it meets the needs of your specific application.

If you have any questions about measuring the strength of neodymium magnets, you are welcome to contact Hawell Magnetics and we will be happy to provide you with professional guidance.

At the same time, if you are looking for neodymium magnets of different strengths, Hawell Magnetics also provides you with N35-N52 high-quality neodymium magnets of various strengths.

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