N45 Magnets – The Ultimate Guide

An N45 magnet is a neodymium magnet grade that finds wide usage in applications requiring permanent magnets. The designation N45 is symbolic, with “N” referring to neodymium and “45” representing the magnet’s maximum energy product in MegaGauss Oersteds.

N45 Magnets
N45 Magnets

Properties of N45 Neodymium Magnets

When evaluating N45 neo magnets, there are several properties you can consider. These include:

N45 Magnet Pull Force

Pull force is affected by factors like the magnet’s size and shape. N45 magnets, display generally high pull force thanks to their strong magnetic properties. The pull force describes the force required to pull a magnet away from a flat, ferrous surface measured in pounds/kilograms.

Compared to lower NIB grades, N45 magnets have greater pull force. N45 grades can have pull force ranging from a few grams to tens of kilograms. Manufacturers typically provide the pull force value for these magnets. However, you can use specialized equipment to conduct a pull force test.

N45 Magnet Pull Force
N45 Magnet Pull Force

Other factors affecting pull force include the type and thickness of the ferrous material it is tested on. Additionally, the distance of the gap between the magnet and the ferrous surface will influence the pull force.

N45 Magnet Strength

The maximum energy product (BHmax) of an N45 neodymium magnet describes its magnet strength. As neo magnets, N45 magnets have strong magnetic fields making them powerful magnets. Given their designation, N45 neodymium magnets have a maximum energy product value of around 45 MGOe.

N45 Magnet Strength Rating
N45 Magnet Strength Rating

N45 Magnet Max Temperature

N45 neodymium magnets can operate in temperatures of up to 150 oC. Not all magnets of this grade have the same maximum temperature.

Factors like magnet size and shape, as well as constitution, may affect the maximum operation temperature. Beyond the maximum operating temperature, N45 neo magnets can lose magnetic properties.

Maximum Operating Temperature for N45 Magnets
Maximum Operating temperature for N45 Magnets

N45 Coercivity

The ability of an N45 magnet to resist demagnetization when subjected to an external magnetic field refers to its coercivity. When describing coercivity, it equates to the magnetic field intensity capable of reducing the magnet’s magnetization to zero.

The coercive value obtained for NdFeB magnets is usually high. The coercivity value of N45 NIB magnets ranges from 11,000 to 12,100 Oersteds (Oe). Coercivity can also be affected by temperature, with higher temperatures reducing the coercivity of N45 magnets.

N45 Remanence

The strength of an N45 magnet’s permanent magnetic field describes its remanence.  Remanence is the residual magnetic flux density in a magnet after removal of the external magnetic field. N45 NdFeB magnets have a remanence value between 13,200 to 13,800 Gauss.

When you compare permanent magnet types, NIB magnets have the highest remanence. This is due to their outstanding magnetic strength. For N45 magnets, this value is considerable higher than lower grades albeit lower than higher grades like N52.

Shapes of N45 Neo Magnets

N45 neodymium magnets are available in a variety of shapes and sizes to meet diverse application requirements. When considering the shape of an N45 magnet, evaluate the use, available space, orientation, and magnetic field distribution.

Some common shapes you will find in N45 magnets include:

  • Disc N45 Magnets: These are flat and circular in shape, much like a coin, with a highly concentrated and strong magnetic field.
  • Ring N45 Magnets: While similar in shape to disc magnets, ring magnets have a hole in the middle. This is ideal where they are intended to fit around a cylindrical object like a shaft.
  • Block N45 Magnets: These are versatile magnets with a cuboidal or rectangular shape that find wide usage.
  • Sphere N45 Magnets: N45 magnets with this shape resemble a ball and usually have multiple poles.
  • Cylinder N45 Magnets: These have a cylindrical and rod shape and can feature an internal radius, or not, with a defined length.

How N45 Magnets compare to Common Neodymium Magnet Grades

N45 vs N52

The N52 neodymium magnet is one of the most superior neodymium magnet grades with exceptional magnetic properties. With a maximum energy product of about 52 MGOe, it is extremely powerful.

N52 Magnets
N52 Magnets

A comparison between the N45 and N52 neodymium magnet grades is summarized below:

  • Magnetic Strength: With over 50 MGOe, N52 neo magnets are considered exceptionally strong magnetically. This makes them significantly stronger than N45 magnets whose BHmax value is around 45 MGOe.
  • Operating Temperature: Both N45 and N52 magnets share similar temperature limitations as standard neodymium magnet grades. These magnets can efficiently operate at temperatures between 80-150°C.
  • Cost: The cost of neodymium magnets is pegged on their magnetic performance. Thus, the higher the magnetic strength, the costlier the magnet. As such, N52 magnets generally cost more than N45 magnets.
  • Applications: The magnetic performance of N52 magnets is superior to that of N45 magnet grade. Where higher magnetic strength display is desired, the N52 NIB grade will be selected over the N45.

N35 vs N45 Magnets.

The N35 neo magnet is a low strength grade with a 35 MGOe maximum energy product. A comparison of this grade with N45 can be summarized thus:

  • Magnetic Strength: N45 neodymium magnets grades are evidently stronger than N35 Neo magnets when you compare their magnetic strengths. At about 45 MGOe, this grade can be applied in application requiring magnetic strength exceeding 35 MGOe.
  • Operating Temperature: Both N45 and N35 neodymium magnet grades make up standard grades whose difference is entirely strength based. Consequently, the operating temperature limits of these magnets is similar typically between 80-150°C.
  • Cost: Since standard neodymium magnet grades are classified based on strength, stronger magnets typically cost more. As such, you find N45 magnets being stronger than N35 magnets cost more.
  • Applications: Where the application requirement hinges on greater magnetic strength, given N35 and N45 magnet, the latter takes the cake. Nonetheless, where you can use both, while N35 will be cost effective, N45 will offer you greater magnetic performance.

Machining N45 Magnet

Neodymium magnets are brittle and prone to chipping and cracking when not handled properly.

For this reason, the machining process of N45 neodymium magnets can be challenging requiring lots of caution. It calls for the use of appropriate tools and techniques to reduce the risk of damage.

Some of the machining processes you can undertake on N45 neodymium magnets include:

  • Cutting Neo 45 Magnets: This can be executed by utilizing specialized diamond tools, like saws and grinding wheels, across the magnetization direction. It is essential to carry out the process slowly and steadily to minimize stress that could cause cracking.
  • Drilling Neo 45 Magnets: Diamond-tipped drills can be used on N45 magnets keeping the RPM low and applying light pressure to avoid overheating and cracking. It is advisable to start with a pilot hole to ensure the drilling process is smooth.
  • Grinding Neo 45 Magnets: Where a certain finish is desired or there’s need to achieve specific dimensions, grinding comes in handy. You can utilize diamond abrasives.
  • Milling Neo 45 Magnets: The milling process for N45 neodymium magnets requires caution to prevent damage through cracking and chipping. Carbide and diamond-coated tools can be used at low speeds to prevent build-up of thermal stress.

Applications of N45 Magnets

The robust magnet properties of N45 neodymium magnets allow for their implementation in several magnetic systems. Some of the areas you will find these magnets are listed below:

  • Industrial Equipment: N45 magnets find use in equipment and machinery requiring strong magnetic fields like motors and generators.
  • Audio Devices: Microphones, speakers and headphones utilize N45 neo magnets in generation of high-quality sound.
  • Magnetic Sensors: The magnetic field generated by N45 can be used in sensor devices to detect presence or movement of objects.
  • Magnetic Separation: Equipment used in separating ferrous materials in mining, food processing and recycling can utilize N45 NIB magnet grade.
  • Magnetic Couplings: These magnets can be used to transmit torque devoid of physical contact between a pair of rotating shafts.

Conclusion

N45 neodymium magnets offer strong magnetic properties useful in different applications as mentioned above. Nonetheless, consider other factors like temperature limitations and specific performance requirements when making the choice of these magnets.

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