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What Is Permanent Magnet

A permanent magnet is a type of magnet that retains its magnetic properties indefinitely, even after removing the external magnetic field. Neodymium magnets or NIB (neodymium-iron-boron magnets) are some of the strongest permanent magnets, even stronger than iron ones. Magnetic poles of magnets cannot be isolated.

Benefits of Permanent Magnet

Permanency
Just like their name suggests, permanent magnets are capable of continually serving you diligently. This is because they do not necessitate electrical energy to preserve their magnetic properties. For instance, if your refrigerator is equipped with a permanent magnet, you can rest assured that all your essentials will be preserved properly and efficiently.

Energy Efficient
One key feature of permanent magnets is their independence or lack of reliance on external electrical supply. They hardly demand electricity to exhibit or retain their magnetization mojo. This translates into lower power bills as well as numerous rewards to the ecosystem.

Compact
To operate in applications that necessitate stronger magnetic properties, one does not necessarily need a relatively large permanent magnet. This is because permanent magnets are capable of generating robust magnetic fields irrespective of size. This property makes them pivotal for applications with limited spaces. For instance, they are broadly employed in medical apparatuses and electronic equipment due to their compactness.

Cost-Effectiveness
Irrespective of the operation, cost is often a major concern for many. However, with a permanent magnet, you do not have to be overly concerned about the overall cost implications. This is because these magnets are specially designed to guarantee operational efficiency, which often translates into overall cost-efficiency in the long run.

High Magnetic Power
Permanent magnets are predominantly engineered to demonstrate robust magnetic capacities. Whether it is attraction or repulsion, you can trust a permanent magnet to do the work competently. This is particularly important for applications that deem strong magnetic properties as an absolute component. For example, generators and motors.

Sustainability
In a bid to fend off the adverse effects of climate change, the world is continually embracing sustainable technologies. Permanent magnets are considerable contributors to sustainability and their application to facilitate sustainability ranges from electric vehicles to electric motors. They help minimize carbon emissions by shrinking fossil fuel dependence.

Zero Electromagnetic Interference
Electromagnets are often susceptible to electromagnetic interference (EMI) unlike permanent magnets. This makes permanent magnets ideal for use in sensitive equipment such as medical equipment.

Versatility
Owing to their zero electromagnetic interference, robust magnetic power, compactness, and sustainability among other benefits, permanent magnets come in handy in multiple areas. Their application range spans from wind turbines to medical devices. Additionally, they are receptive to customization, which makes their application range virtually limitless.

Bonded Magnet
Hair Dryer Nozzle Magnet Bonded magnet
NdFeB Magnetic Assembly
With the advancement of multidisciplinary cross-technology, composite devices of bonded NdFeB and metal parts will further develop in the direction of intelligence and modularization. Stainless steel
Segment Magnets
Segment magnets some time can be called arc magnets.it is a type of permanent magnet made from an alloy of neodymium, iron, and boron (NdFeB).nomally the magnets are with Znic or
NdFeB Bonded Magnet Rotors
NdFeB Bonded Magnet Rotors are magnetic device composed of bonded magnet and shaft. Bonded NdFeB magnet rotors are usually used as the inner rotor of brushless DC motor, they commonly used in power
Water Pump Impeller
An impeller is a rotating iron or steel disc with vanes in a centrifugal pump. Impellers transfer energy from the motor that drives the pump to the fluid being pumped by accelerating the fluid
Plastic Bonded Ferrite
Plastic bonded ferrite is also called injection molded ferrite. It is processed by injection molding from ferrite powder and thermoplastic resin (PA6/PA12/PA66/PPS). Injection molded ferrite is an
Magnet Rotors
Magnet Rotors: the rotating part of the motor. In the motor, Magnet Rotors are mainly used to generate a magnetic field to transmit torque and motion to the outside, thereby realizing the conversion
Water Pump Impeller
A water pump impeller is the rotating part or steel disc with blades in a water pump. It transfers energy from the motor driving the pump to the pumped liquid by accelerating the fluid radially
Plastic Magnet Rotor
Plastic magnet rotor is a composite material made by hot-melt mixing of permanent magnetic powder and resin polymer (PA6, PA12, PPS) and other compounds. It is manufactured into a plastic magnetic
Bonded Neodymium Magnets
Neodymium magnet, also called NdFeB magnet, is a tetragonal crystal composed of neodymium, iron, boron (Nd2Fe14B) and other elements. Neodymium magnets were discovered in 1982 by Masato Sagawa of
Magnet Holder
The so-called magnet holder is to put the magnet into an iron or copper container (concave type, square type, ring type, column type or special shape, etc.) to multiply its adsorption force and apply
Axially Multipole Magnetized Magnet
Axially multipole magnetized magnet is a special axial magnetization method.Axially multipole magnetized magnet is divided into single-sided multipole and double-sided multipole. Axially multipole

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Efficient and convenient
The company has established marketing networks around the world to provide high-quality services to customers in an efficient and convenient manner.

Quality assurance
In terms of quality assurance, the company strictly follows the standards and norms of the industry quality system. Adopt industry-leading testing equipment to ensure product quality and good reputation.

Professional team
We have a team of skilled and experienced professionals who are well-versed in the latest technology and industry standards. Our team is dedicated to ensuring that our customers get the best service and support possible.

Competitive prices
We offer our products at competitive prices, making them affordable for our customers. We believe that high-quality products should not come at a premium, and we strive to make our products accessible to all.

Rich experience
Has a long-standing reputation in the industry, which makes it stand out from its competitors. With over many years of experience, they have developed the skills necessary to meet their clients' needs.

High quality products
We always put customer needs and expectations in the first place, refine on, continuous improvement, to seek every opportunity to do better, to provide customers with their expectations of quality products, to provide customers with the most satisfactory service at anytime.

Types of Permanent Magnet

01/

Ceramic magnets
Ceramic magnets or ferrite magnets are made from iron oxide and barium. They are manufactured by the process of pressing and sintering and are fragile. They are superior in terms of magnetic strength and resistance to demagnetising. Due to this, they are used widely in many instruments. Ceramic magnets have a high coercive force and are resistant to corrosion.

02/

Alnico magnets
Alnico magnets are made of aluminium, nickel, cobalt and other materials that enhance magnetic abilities. They can remain stable at high temperatures and are resistant to corrosion. They are made from casting and sintering. They are stable at high temperatures and can withstand force.

03/

Samarium-Cobalt (SmCo) magnets
These are made from rare earth metal with high oxidation state and magnetic strength. They are used in applications that are used at high temperatures. They have a high resistance to corrosion. SmCo magnets are costly and have low magnetic strength. They have high energy products.

04/

Neodymium Iron Boron magnets
These permanent magnets are made from Neodymium, Iron and Boron. They get oxidised easily and are moderately resistant to temperature. They are costly and used only in selective applications. These magnets are highly coercive. They have high energy products.

05/

Injection-molded magnets
These permanent magnets are used in molding different materials and are quite expensive. They have moderate energy products and coercive force. They can’t withstand high temperatures.

06/

Flexible magnets
They are similar to injection-molded magnets but are produced in flat strips and sheets. They are cheap. They have a moderate coercive force and high corrosion resistance.

What is the Difference Between Permanent Magnets and Temporary Magnets

A permanent magnet is a type of magnet that does not require an external magnetic field to remain fully magnetized, while a temporary magnet is a type of magnet that requires an external magnetic field to remain fully magnetized.
The properties of a permanent magnet do not change, whereas a temporary magnet is a magnet whose magnetic properties are constantly changing. Permanent magnets are made of hard materials, while temporary magnets are made of soft materials.
The magnetic poles of permanent magnets can never be reversed, while the magnetic properties of temporary magnets can be reversed.
The magnetic field strength of a permanent magnet is constant, while the strength of a temporary magnet always changes with conditions.
Permanent magnets don't need electricity to work like magnets, while temporary magnets always need electricity to work like magnets.
Permanent magnets are called bar magnets, while temporary magnets are also called electromagnets.
The magnetic field in the permanent magnet does not disappear with the disappearance of the external magnetic field, while the magnetic field in the temporary magnet disappears when the external magnetic field disappears.
The magnetic domains of permanent magnets, once aligned, can never be easily reversed, while the magnetic domains of temporary magnets, once aligned, are easily reversed.
In physics, permanent magnets are the type of magnets that are made of a hard permanent ferromagnetic material, while temporary magnets are the type of magnets that are made of some ferromagnetic temporary material.

Common Uses of Permanent Magnets in Everyday Life

Permanent magnets have a wide range of applications. Here are 6 of the most common ones.

Automobile manufacturing
Both hybrid and electric vehicles are manufactured using very powerful permanent magnets. The main principle used here is the ability of the magnets to convert mechanical force into electrical force. These magnets are an essential component of the vehicles and are made of materials with a high composition of rare earth magnets. These kinds of magnetic materials are pricey and limited in supply.

Loudspeakers
Loudspeakers contain a mobile electromagnetic coil, around which the permanent magnet is fixed. This setup uses the same principle in electric cars, where electrical energy is converted into mechanical energy. The electromagnetic material is attached to a diaphragm or cone, amplifying vibrations to emit sound waves. The frequency of the vibration controls the pitch or intensity of the sound produced by the loudspeaker.

Hard disk drive
Another place where permanent magnets find practical application is in disk drives. They play a central role in helping to store information in the drives. Hard disk drives (HDD) usually are made up of 3 permanent magnets. The mechanism involved in reading and writing information on hard disks is quite interesting. A fixed magnet serves as the actuator, moving the read-write arm based on its interaction with an electromagnet. There’s another small permanent magnet at the end of the read-write arm, which is in charge of the reading-writing actions using a platter. The third magnet is a spindle motor, which facilitates the movement (rotation) of the platter at high speed. This way, the HDD can read and store information.

Refrigerators
Did you know that a permanent magnet is used in making refrigerators? You may not have noticed it, but whenever you close the refrigerator, the small magnet embedded in the door is what allows the door to close. If you observe closely, the refrigerator's door usually acts as though the fridge itself is pulling it. That is the magnet at work! Unlike in electric generators and loudspeakers, the magnet, in this case, is not a strong magnet.

Jewelry
Permanent magnets are used in making your jewelry. Earrings, bracelets, necklaces, and beads contain permanent magnets that ensure they clasp together. Neodymium magnets, in particular, can be used to create bipolar magnetic neodymium jewelry.

Magnetic drive pumps
Pumps coupled with magnetic materials are helpful both in home gardens and industrial settings. The setup in magnetic drive centrifugal pump operation is similar to that of a standard centrifugal pump. However, the motor shaft seal is removed, eliminating leaks caused by shaft seal failure. There are many more applications of permanent magnets in everyday life. Permanent magnets are used in headphones, induction cookers, MRI machines, particle accelerators, transformers, electric generators, and even door locks. For more information, please visit our homepage.

How Permanent Magnets Work

Atomic Structure and Electron Spin
At the heart of a permanent magnet lies atoms and subatomic structures consisting of protons, neutrons, and electrons. The protons and neutrons are held in the atom’s nucleus and they are orbited by electrons, which have an angular momentum. This momentum often leads to spinning, which generates a magnetic moment. And since permanent magnets are made of unique materials like cobalt and iron, the alignment of numerous moments leads to comprehensive magnetic moments.

Domain Formation
After the attainment of net magnetic moments within the magnet’s atoms, microscopic regions are formed. These regions are referred to as magnetic domains and they are essentially an assembly of tons of atoms with affiliated magnetic moments. In permanent magnets, these moments are aligned in a harmonious direction.

Generation of a Magnetic Field
With the magnetic domains in place and the magnetic moments aligned, a magnetic field is created. The field covers the area surrounding the permanent magnet and its strength is determined by the magnetic material and the level of domain alignment.

Interaction with Other Objects
Magnets in general, typically interact with other items in two ways; attraction or repulsion. With the magnetic field functional, bringing a ferromagnetic object nearby will result in instant attraction. However, bringing diamagnetic objects within the magnetic field will result in immediate repulsion.

Structure of a Permanent Magnet

A permanent magnet retains its magnetic properties for an extended period. The term ‘magnet’ originated from the magnetite, or lodestone, which is a naturally occurring magnet.

Inside cells, the nucleus and the electrons act like magnets and have their magnetic fields. The magnetic fields are generated by electrons orbiting the nucleus. The magnetic field of a magnet is the sum of the nuclear spins. In ferromagnets such as iron, cobalt, and nickel, all the spins of the electrons line up, creating a magnetic field that affects the objects around it.

Permanent magnets are formed by heating a ferromagnetic material to a specific temperature and cooling it down into a shape we want. They can be magnetised by placing them inside an external magnetic field, and they do not lose their magnetic properties.

The magnetic strength and the polarity of permanent magnets cannot be changed. They have high permeability for easy magnetisation and high coercivity and retentivity. Magnetic bistability is achieved due to constant magnetic fields. As opposed to a temporary magnet, the field can’t be turned off and on when required.

The structure of permanent magnets can be explained using the B-H curve. This curve tells us about the strength of a magnetic field when a demagnetising field is applied. Permanent magnets are widely used in speakers, headphones, generators, fridge magnets and so on.

The Different Materials Permanent Magnet and Which One Is Right for You

Permanent magnets are manufactured with four main types of materials: ceramic, alnico, samarium cobalt, and neodymium iron boron. Below we’ll discuss the advantages and disadvantages of each material and help you decide which is best for your needs.

Ceramic
In most cases, you’re probably going to use a ceramic magnet, as it’s the most common material used to manufacture permanent magnets. Ceramic, or sometimes referred to as ferrite, magnets are made with several elements, such as sintered iron oxide and barium. These magnets are great for several reasons: first their magnetism is strong, so it’s difficult to demagnetize over time. Another benefit of ceramic is that it won’t rust, making maintenance rather simple. Alternatively, ceramic magnets can be extremely hard, making them fragile especially when dropped.

Alnico (AlNiCo)
For those who require a stronger magnetism, alnico magnets are excellent. Manufacturers primarily use aluminum, nickel, and cobalt to build alnico magnets. If your company handles materials at different temperatures, alnico magnets are probably the best option available for you. The reason is because they’re stable at a wide variety of temperatures while maintaining strength. There are two common types of alnico magnets: cast and sintered. Cast alinco are the most common because there are several different grades, including options that are capable of maintaining most of their strength in temperatures over 1000 degrees Fahrenheit. Alternatively, sintered alnico magnets are typically weaker in terms of their magnetism, but they’re better for mechanical uses.

Samarium Cobalt (SmCo)
Manufacturers build these magnets using samarium and cobalt and a sintering method. These are often found in what’s called a rare earth grade, the strongest magnets available. Samarium cobalt magnets are extremely resistant to different temperatures and maintain their strengths. Many companies have samarium cobalt magnets for magnetic separation in several industries, such as pharmaceuticals, automotive, aerospace, manufacturing, and more. In other words, samarium cobalt magnets are one of the strongest and most versatile industrial magnets available on the market today.

Neodymium Iron Boron (NdFeB)
Like samarium cobalt, neodymium iron boron magnets are made with a rare earth material as well. The overwhelming advantage of neodymium iron boron magnets is that they’re extremely strong. Additionally, they serve several applications which is why they’re often found in places like magnetic separation setups, wind turbines, motors, and so on. However, there are two factors to keep in mind when considering neodymium iron boron magnets: temperature and corrosion resistance. These magnets don’t have as high of a temperature threshold for them to operate in efficiently. In addition, neodymium iron boron magnets are more susceptible to corrosion than other magnet alternatives.

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Our Factory

Highmag Technology (ShenZhen) Ltd is the subsidiaries of AT&M (Stock Code:000969), which is powerful in new material area and completed IPO in Shenzhen Stock Exchange. We are a professional manufacturer of NdFeB magnet, MIM (metal injection moulding) and SMC (Soft Magnetic Composite). We started magnet manufacturing in Taiwan from 1989 and founded ShenZhen factory in 2001. In 2003, the asset restructuring has become a holding subsidiary. During these years, Highmag has performed excellently and received praise from customers for the technology, manufacturing, service, quality, lead time and cost control. Highmag keeps developing new products and new methods and making full use of geographic advantages--Shenzhen, in order to satisfy the wide requirements of customers in various fields.

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FAQ

Q: What is a permanent magnet easy definition?

A: A permanent magnet is a type of magnet that retains its magnetic properties indefinitely, even after removing the external magnetic field. Neodymium magnets or NIB (neodymium-iron-boron magnets) are some of the strongest permanent magnets, even stronger than iron ones. Magnetic poles of magnets cannot be isolated.

Q: Why are permanent magnets?

A: A permanent magnet is called a permanent magnet because its magnetism is 'always on', it generates its own persistent magnetic field unlike an electromagnet which is made from a coil of wire wrapped around a steel core and requires an electric current to generate a magnetic field.

Q: What are two permanent magnets?

A: The five types of permanent magnets are alnico, samarium cobalt, ferrite, flexible rubber, and the strongest permanent magnets, neodymium magnets.

Q: How to identify a permanent magnet?

A: Bar magnets and horseshoe magnets are two of the most common shapes of magnet. One of the most important features of a permanent magnet, whatever shape it is, is that it has two different ends. These ends are called poles. Poles can be north or south..

Q: Can we make a permanent magnet?

A: Take two magnets put one North pole and one South pole on the middle of the iron. Draw them towards its ends, repeating the process several times. Take a steel bar, hold it vertically, and strike the end several times with a hammer, and it will become a permanent magnet.

Q: What is a permanent magnet called?

A: Magnets made of Neodymium Magnets (NdFeB), Samarium Cobalt (SmCo), AlNiCo, and Ferrite are generally referred to as permanent magnets, whereas electromagnets are commonly classed as non-permanent magnets.

Q: Is permanent magnet strong?

A: Obviously by definition, permanent magnets retain their magnetic strength perpetually. With very few exceptions, including exceeding maximum operating temperature, permanent magnets remain magnetized constantly.

Q: Can permanent magnet attract?

A: The electron orbitals in an adjacent piece of material will be pushed by coulomb force of the charged particles with parallel electron orbitals to follow the electron orbital directions of the magnet. Therefore, A permanent magnet attracts only magnetic substances.

Q: Is a permanent magnet AC or DC?

A: Permanent magnet AC motors have a simplified rotor that enables higher efficiency with small torque loads, and high-speed capabilities. Aside from electric vehicles, AC motors are used in pumps, fans, blowers, grinders, mixers, and conveyors.

Q: What is the formula of permanent magnet?

A: And here the second key feature enters; the magnetic field of permanent magnets can be calculated from the equivalent surface current density I = dI/ds = Br/µ0 that is proportional to the remanent magnetic field Br of the permanent magnet material. Here µ0 = 4π × 10−7 A/Tm is the permeability of free space.

Q: What causes permanent magnets?

A: Modern theories of magnetism maintain that a magnetic field is produced by an electric charge in motion, and thus it is theorized that the magnetic field of a so-called “permanent” magnets such as lodestone is the result of electrons within the atoms of iron spinning uniformly in the same direction.

Q: What is the test for a permanent magnet?

A: Test Methods and Procedures for Permanent Magnet Materials. The surface flux density, or the flux density at a certain distance from the magnet can be obtained using a Gaussmeter and an Axial or Transverse probe. The probes contain a Hall Effect device whose output voltage is proportional to the flux density.

Q: What is the principle of permanent magnet?

A: A permanent magnet alternator (also called PMA, permanent magnet generator, PMG or magneto) relies on the magnetic field generated by a permanent magnet to convert mechanical energy into electrical power. It can generate AC current, with which it can power the whole engine and charge the battery.

Q: What powers a permanent magnet?

A: Their spin is just a kind of intrinsic angular momentum that they possess. So permanent magnets don't need any power source. A ferromagnetic material can lose its macroscopic magnetism if its spins become non-aligned, but an electron can never lose its tiny magnetic moment.

Q: What are three properties of permanent magnets?

A: They are Attractive Property – Magnet attracts ferromagnetic materials like iron, cobalt, and nickel. Repulsive Properties – Like magnetic poles repel each other and unlike magnetic poles attract each other. Directive Property – A freely suspended magnet always points in a north-south direction.

Q: What is the concept of a permanent magnet?

Q: Are permanent magnets strong?

A: The strongest permanent magnets in the world are neodymium (Nd) magnets, they are made from magnetic material made from an alloy of neodymium, iron and boron to form the Nd2Fe14B structure.

Q: Do permanent magnets decay?

A: Yes, permanent magnets do lose magnetic field strength over time if they are at any non-zero temperature. The process can be very slow for certain kinds of permanent magnets if they are maintained at optimal operating temperature.

Q: What is the benefit of permanent magnet?

A: Permanent magnets have the main benefit of operating without a power supply, making them energy efficient. They are easily portable to a variety of locations. Furthermore, their availability in very small dimensions make them ideal for size-limited applications.

Q: What are four uses of permanent magnets?

A: Permanent magnets are used in audio equipment like headphones, loudspeakers, etc. Permanent magnets are used in MRI Scanners. Permanent magnets are used in Hard Disc Drives in computers. Permanent magnet is found in closing the door of a refrigerator.

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