0086-574-86666833
sales@mag-spring.com
Search
Blog
Now we are the lead supplier and factory of magnetic separator, magnetic filters, pot magnets and permanent magnets in China.
Contact Us to Get Started
Home    Blog

Detailed Guide to Permanent Magnets and Electromagnets. 

Updated on 2023-12-29

Magnets have been used for centuries for various purposes, from compasses to refrigerators. They come in two primary types: permanent magnets and electromagnets. In this article, we will discuss the details of both, permanent magnets and electromagnets. 

 

Permanent Magnets: 

A permanent magnet is a type of magnet that retains its magnetic properties even after being removed from the magnetic field. It is composed of ferromagnetic materials such as iron, cobalt, nickel, and their alloys, and can generate a magnetic field that is used for various applications. The magnetic field of a permanent magnet is always present and does not require an exteal current to be activated, hence the term "permanent."

Permanent magnets have two poles, north and south, which are opposite and attract each other. When two permanent magnets are brought together, their magnetic fields interact, and they either attract or repel each other depending on the orientation of their poles.

Permanent Magnets and Electromagnets. 

How Permanent Magnets Are Made?

Permanent magnets are made using various manufacturing processes, each of which has its advantages and disadvantages. Here are some of the most common methods used to make permanent magnets:

Sintering: This method involves mixing the ferromagnetic material with a binder to form a powder, which is then pressed into the desired shape and heated in a fuace. The high temperature causes the particles to fuse, forming a solid block of material with magnetic properties.

Bonded Magnets: In this method, the ferromagnetic material is mixed with a polymer binder and then molded into the desired shape. This method is often used to create small, complex shapes that cannot be easily made using other methods.

Injection Molding: This process involves mixing the ferromagnetic material with a polymer binder and then injecting it into a mold under high pressure. The mold is then cooled, and the magnet is removed from the mold.

Extrusion: This method is similar to injection molding, but instead of injecting the material into a mold, it is extruded through a die to form a specific shape. This method is often used to make long, thin magnets.

Uses of Permanent Magnets:

Permanent magnets are used in a wide variety of applications, ranging from everyday objects to complex industrial equipment. Here are some common uses of permanent magnets:

  • Electric Motors:Permanent magnets are widely used in electric motors to generate the magnetic field that drives the rotor. The strength of the magnetic field determines the motor's torque, and the speed of the motor is controlled by changing the current.
  • Speakers:Permanent magnets are used in speakers to generate the magnetic field that moves the speaker cone. When an electric current passes through the coil attached to the cone, it interacts with the magnetic field, causing the cone to move and generate sound waves.
  • MRI Machines: Permanent magnets are used in MRI machines to create a strong magnetic field that aligns the protons in the body's tissues. When a radio wave is applied, the protons absorb the energy and release it, allowing the MRI machine to create a detailed image of the body's inteal structures.
  • Magnetic Separators:Permanent magnets are used in magnetic separators to remove magnetic materials from a mixture. The mixture is passed through a magnetic field, which attracts the magnetic particles and separates them from the non-magnetic particles.

Electromagnets: 

An electromagnet is a type of magnet that is created by passing an electric current through a coil of wire. The wire is often wound around a core made of a ferromagnetic material, such as iron. The magnetic field produced by the electromagnet can be controlled by changing the amount of current flowing through the wire. Electromagnets are temporary magnets because their magnetic field only exists when current is flowing through the coil. Electromagnets are often used in place of permanent magnets because they can generate stronger magnetic fields. They are also useful because their magnetic field can be tued on and off by controlling the electric current flowing through the wire.

How do Electromagnets work?

To understand how an electromagnet works, it is important to first understand how magnets work. Magnets have two poles, north and south, and are surrounded by a magnetic field. When two magnets are brought near each other, the opposite poles will attract each other, and the like poles will repel each other.

An electromagnet works by using an electric current to create a magnetic field. When an electric current flows through a wire, it creates a magnetic field around the wire. The strength of the magnetic field depends on the amount of current flowing through the wire. The magnetic field created by a single wire is weak, but when the wire is wound into a coil, the magnetic fields from each loop of wire add together to create a much stronger magnetic field. This is why electromagnets are made by wrapping a wire around a ferromagnetic core. The core amplifies the magnetic field generated by the wire, making it much stronger. The strength of the magnetic field generated by an electromagnet can be controlled by adjusting the amount of current flowing through the wire. When the current is increased, the magnetic field becomes stronger, and when the current is decreased, the magnetic field becomes weaker.

Benefits of Electromagnets: 

Some of the benefits of electromagnets include:

  1. Control and Precision: 

Electromagnets can be switched on and off by controlling the flow of electricity, allowing for precise control of the magnetic field strength and direction. This makes them useful in applications such as magnetic levitation and magnetic separators.

  1. Efficiency: 

Electromagnets can be made to produce a strong magnetic field using relatively small amounts of electrical power. This makes them more efficient than permanent magnets in many applications.

  1. Versatility: 

Electromagnets can be designed to produce magnetic fields of varying strengths and sizes, making them suitable for a wide range of applications.

  1. Safety: 

Electromagnets are safe to handle as they do not retain a magnetic field when the current is tued off, unlike permanent magnets.

  1. Flexibility: 

Electromagnets can be designed and configured to fit a variety of different shapes and sizes, making them adaptable to a range of applications.

Conclusion: 

Permanent magnets and electromagnets are both essential components of mode technology and have a wide range of applications. The importance of permanent magnets and electromagnets can be seen in their widespread use in many different industries, including manufacturing, transportation, telecommunications, and medicine. Without these technologies, many mode conveniences and advances would not be possible. Mag Spring is a reputable permanent magnets and electromagnets supplier. We can provide you with the high-quality items that you require.

Contact Us Now
Enter your inquiry details, We will reply you in 24 hours.
Name can't be empty
Email error!
Company can't be empty
Message can't be empty
Send Message
Hot Article
2023-12-29
What is a rotary grate magnet separator?
Rotary grate magnet separators are used in a variety of industries to remove ferrous contaminants from product flow and they can be used in a variety of sizes and configurations.
2023-12-29
How magnetic assembly helps in magnets?
Magnetic assembly can help you create a powerful, efficient, and reliable product. Mag Spring has high magnetic assembly products.
2023-12-29
An overview of neodymium permanent magnets
The Neodymium permanent magnet is a rare-earth magnet.Magnetic springs are great places to buy these magnets as our magnets are made of first class materials. 
2023-12-29
Decorative magnetic hooks for refrigerator 2022
Decorative magnetic hooks for refrigerator are a significant, unique, and decorative element or a handy solution for hanging tools
2023-12-29
Why Permanents magnets strength will be decreased or disappeared in high temperature?
Why Permanents magnets strength will be decreased or disappeared in high temperature? Permanent magnets has magnetic strength because ferromagnetic
2023-12-29
DC motor magnet Types – Role – Examples
Do you want to know about DC motor magnet Types – Role – Examples then continue to read it. This Article covers up all the detail.
2023-12-29
Why BLDC motor magnets are important?
Bldc motor magnets are a must for any application that requires a significant amount of power because of their high level of efficiency. It is highly recommended that you purchase bldc motor magnets from Mag Spring.
2023-12-29
Understanding Overband Magnetic Separators
Overband magnetic separators offer a range of benefits in any facility. They are used to remove ferrous materials from free-flowing materials, making them a valuable tool in a variety of industries.
Set A Consultation Today
Name can't be empty
Email error!
Message can't be empty
*We respect your confidentiality and all information are protected.
Send
Let’s Work on Your Next Permanent Magnet Project
Companies All Around The World Trust MAG SPRING® for awesome project creations
Contact Us to Get Started
sales@mag-spring.com 0086-574-86666833
No. 99 Lipu Road Xiepu Zhenhai Ningbo
Contact Details
sales@mag-spring.com 0086-574-86666833
No. 99 Lipu Road Xiepu Zhenhai Ningbo
Contact Us Now
Name can't be empty
Email error!
Company can't be empty
Message can't be empty