What is Magnetic Pull Force?
Magnetic pull force, also called magnet pull strength is the highest “holding power” of a magnet. That is, the maximum amount of force the magnet uses to pull or attract ferromagnetic materials. It is one of the best ways to gauge a magnet’s strength.
The unit of measurement for the magnet pull strength is pounds or kilograms.
Importance of Magnet Pull Strength
The knowledge of magnet pull strength will help you determine whether a magnet is suitable for a specific application or not.
For instance, through the pull force, you can determine the strength of the magnetic field. That is, a higher pull force will most likely translate to a stronger field strength.
Therefore, you will experience a stronger force of magnetic attraction.
Industries such as automotive, machining, or fabrication depend on the knowledge of pull strength to determine whether a magnet is suitable for a specific application or not. Common applications may include securing or lifting parts.
How to Improve the Pull Force of a Magnet
There are many ways to improve a magnet’s pull force. Some common options include:
- Magnetize magnet – in case the magnet has started losing its magnetic properties, the magnetization will help align the domain. Aligning magnetic domains will boost the magnet pull strength.
- Multiple Pole Magnetization – trying multiple pole magnetization can increase the magnetic field strength.
- Axial magnetization – it is a common technique for rod or cylindrical-shaped magnets. You should magnetize these magnets along their axis. By doing so, you will increase the magnet’s strength and pull force.
- Radial magnetization – this is where magnetization takes place from the magnet’s center to the outside circumference.
Safety Precaution when Dealing with Magnetic Pull Force
Magnet has its unique danger especially if not handled properly. Therefore, you must handle magnets properly to avoid possible interference or harm.
Well, the dangers may vary depending on where you are using the magnet. Let’s quickly look at some precautions and safety measures:
- Magnet handling – when handling magnets with high pull force, always keep them away from body parts or other magnetic materials.
- Keep magnets away from electronics – certain electronics such as storage media, or credit cards may be affected by magnets. Remember, the strong magnetic fields can cause interference or malfunctioning of the device.
- Adopt better storage – always store your magnets safely away from pets or kids. It is one of the best ways to prevent possible accidental injury.
- Use magnet for intended purpose – there are many magnets with varying pull force. Always use magnets specifically for the intended purpose.
Factors Affecting Magnet Pull Strength
Type of Magnet Materials
Neodymium magnets are very powerful and strong magnets. Therefore, you should expect a higher pull force.
Shape and Size of the Magnet
Larger magnets made from the same material will have higher pull force. Also, the magnet shape may affect the magnet pull force. If a magnet has a pointed end, there is a possibility the strength will be higher.
Other factors to consider are:
- Distance between the magnet and the object
- Recharging weak magnets
- Stacking magnets
Measuring magnet pull strength is very critical. It determines the strength of a magnet.
With the advancement in technology, there are many ways to determine the pull force:
- A magnetic pull test kit will help you determine the strength of your magnet
- Force gauge or dynamometer are other accessories you can use to determine the pull force of a magnet
Usually, determining the magnetic pull force technique may vary. For instance, it may involve:
- Exerting a force perpendicularly to the magnet
- Keep exerting the force until the magnet separates from a surface it was attracted to
- You can measure the force using a special instrument such as a dynamometer
As you measure the magnet pull force, certain factors may affect the final results. Certain variables that affect the magnetic pull force are:
- Surface roughness
- Surrounding temperature
- Coatings on the magnet surface
- Air gap
The formula for calculating magnetic pull force is the mass of the object multiplied by the acceleration.
As you measure the pull strength, you will realize it varies depending on the type of magnet. Take for example:
Neodymium Magnet’s Pull Force
They are also called rare-earth magnets. These are some of the strongest magnets in the market. These magnets have the highest pull force. For this reason, they are a perfect choice for applications that require strong magnetic fields.
Pull Force to Ferrite Magnets
Ferrite magnets or ceramic magnets are known for their moderate pull force. These magnets are perfect for applications that do not require very high pull force.
Pull Force for Alnico Magnets
Alnico magnets are known for moderate pull force. However, they are the perfect choice for applications that require temperature stability.
The pull force of a magnet determines whether a magnet is suitable for a specific application or not. Remember, every application requires a unique pull force for the magnet to perform the intended tasks.
Some common applications include:
Magnetic Clamping Systems
Many factories use powerful magnets to secure parts or workpieces during machine operations. With this, they can achieve secure and accurate positioning during the manufacturing process.
Wind turbines and generators use powerful generators to produce power. That is, they convert mechanical energy into electrical energy. These magnets use powerful electric fields to generate enough renewable energy.
Magnetic Resonance Imaging (MRI)
The medical industry has also benefited from the powerful magnets. Powerful magnets generate magnetic fields for better imaging. Remember, the strength of the magnet will determine the quality of the image.
In short, before you assign any magnet for a specific task, it must produce sufficient pull force. Remember, we use magnets for various applications due to their magnetic field or pull and push force of attraction.
This forms the basis for the magnet working principle.