Permanent Magnets Types, Pros & Cons

At present, commonly used permanent magnets are ferrite magnets, neodymium magnets, SmCo magnets, AlNiCo magnets, rubber magnets, and so on. Each type of the above magnets has its properties, and their pros & cons are also different. So in this article, let's take a deeper look at the permanent magnet types, pros & cons.

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Permanent Magnets Types, Pros & Cons

1. Ferrite Magnet

Ferrite magnets are a non-metallic magnetic material, also known as magnetic ceramics. They have a wide range of applications. Ferrite magnets do not have high magnetic properties. Typically, the magnetic energy product (one of the parameters to measure the performance of magnets) can only be slightly higher than 4MGOe.

Pros of Ferrite Magnets

The biggest advantage of this kind of magnet is its low price. At present, they are still widely used in many fields. For example, the horn magnet in the traditional radio is made of ferrite magnets. Besides, since ferrite magnets are made of ceramic material, there are few corrosion problems. The finished products do not need surface treatment such as electroplating or coating.

Cons of Ferrite Magnets

Ferrite magnets are generally formed by molds and then sintered. Therefore, it is difficult to machine ferrite magnets. So most ferrite products have simple shapes and large dimensional tolerances.

2. Rubber Magnet

Rubber magnet is one of the series of ferrite magnetic materials. It is a flexible, elastic, and twistable magnet made by bonding ferrite magnetic powder and synthetic rubber and extruding, calendering, injection molding, and other processes. Generally, its magnetic energy product is 0.60&#;1.50 MGOe. Rubber magnets can be processed into strips, rolls, sheets, blocks, rings, and other various complex shapes.

Applications of Rubber Magnets

Rubber magnets are mainly used in refrigerators, teaching instruments, switches, sensor magnets, micro motors, disinfection cabinets, kitchen cabinets, toys, stationery, advertising, and other industries.

3. SmCo Magnet

The main components of SmCo magnets are samarium and cobalt. Since the above two materials are expensive, SmCo magnets are one of the most expensive magnets available on the market today. 

Pros of SmCo Magnets

The magnetic energy product of SmCo magnets can reach 30MGOe, or even higher. In addition, the SmCo magnet has a high coercive force and high-temperature resistance and can be applied to a high temperature of 350 degrees Celsius, so it cannot be replaced in many applications. Besides, since SmCo magnets have electrical conductivity, they can be processed by wire cutting. Moreover, SmCo magnets have good corrosion resistance and generally do not require anti-corrosion plating or painting.

Cons of SmCo Magnets

The SmCo magnet is very brittle, so it is difficult to process small-sized or thin-walled products.

4. Neodymium Magnet

Due to their excellent magnetic properties and ease of processing, relatively low price, neodymium magnets, or NdFeB magnets are currently widely used and rapidly-developing magnet products.

Pros of Neodymium Magnets

The magnetic energy product of NdFeB magnets can reach 50MGOe, which is 10 times that of ferrite magnets. Due to the excellent magnetic properties of neodymium magnets, on many occasions, they are used to replace other magnetic materials to reduce product volume. In addition, just like SmCo magnets, NdFeB magnets also have good processing performance. Therefore, the dimensional tolerance of NdFeB products is much better than that of the ferrite products. Generally, the dimensional tolerance of general NdFeB products can be (+/-) 0.05mm.

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Cons of Neodymium Magnets

The maximum operating temperature of NdFeB magnets is around 180 degrees Celsius. If in a harsh environment, it is generally recommended that the maximum operating temperature of NdFeB magnets does not exceed 140 degrees Celsius. In addition, neodymium magnets are easily corroded. Therefore, most NdFeB products need to be plated or painted. Commonly used surface treatments include nickel plating (nickel-copper nickel), zinc plating, aluminum plating, electrophoresis, etc.  If they work in a closed environment, phosphating can also be used.

5. AlNiCo Magnet

AlNiCo magnet is an alloy composed of metals aluminum, nickel, cobalt, iron, and other trace metal elements, and its magnetic energy product can reach 9MGOe. AlNiCo magnets are widely used in the field of sensors.

Pros of AlNiCo Magnets

The biggest pro of AlNiCo magnets is their high-temperature resistance, and their working temperature can reach 550 degrees Celsius.

Cons of AlNiCo Magnets

AlNiCo magnets are very easy to demagnetize under the reverse magnetic field. If you force the same pole direction (two N or two S) of two Alnico magnets together, the magnetic field of one of the magnets will be reversed or reversed. Therefore, they are not suitable to work under the reverse magnetic field (such as a motor).

Conclusion 

Thank you for reading our article and we hope it can help you to have a better understanding of the permanent magnet types, pros & cons. If you want to know more about permanent magnets, we would like to recommend you visit Stanford Magnets for more information. Stanford Magnets is a leading magnet supplier across the world, that has been involved in R&D, manufacturing, and sales of strong magnets and ferrite magnets since the s. It provides customers with high-quality rare earth permanent magnetic products such as neodymium magnets, SmCo magnets, AlNiCo magnets, and other non-rare earth permanent magnets at a very competitive price.

What is a PMDC Motor?

You will find permanent magnet motors in any number of appliances in your daily life, from toothbrushes to mobility solutions; but what exactly are they and what are their advantages? In this article, we will focus on PMDC motors, which are the most common type of permanent magnet motor. As trusted manufacturers of motors for 75 years, Parvalux PMDC motors are specified by manufacturers in a huge range of industries.

Like an AC motor, a permanent magnet motor uses electromagnetism to generate torque. PMDC motors have permanent magnets in the stator that provide the magnetic field needed to make it function. This is an alternative to traditional brushed or brushless DC motor, where the magnetic field is created in the stator windings..

As the magnets are fixed in a permanent magnet motor, you cannot control the magnetic field strength externally. This means that you are likely to find PMDC motors in applications where the speed doesn&#;t need to be controlled. This being said, control can be achieved by controlling armature voltage, so they are not necessarily excluded from use in industries where speed and torque need to vary.

They are an excellent choice for products in the leisure and healthcare industries because PMDC motors offer an impressive output and are high performance, despite being generally smaller than other motors.

Advantages of PMDC Motors

• Smaller in size &#; As mentioned above, PMDC motors are generally smaller than other motors, but this doesn&#;t mean they are less useful. In fact, they are perfect for small applications such as windshield wipers, air conditioning units and even electric toothbrushes. This also helps with portability, making them easy to transport globally.
• Use in multiple applications &#; Permanent magnet motors can be used in a variety of industries because they can be designed to meet a number of needs, such as size and power. You are just as likely to find a PMDC motor in a computer drive, as you are in a child&#;s toy.
• High starting torque &#; Like other DC motors, PM motors have a high start-up power, making them perfect for a variety of industries. Despite a lower speed, these motors are still very reliable and when combined with one of our gearboxes they create the ultimate geared motor solution.
• Cost-Effective &#; Due to their smaller size and lack of field windings, permanent magnet motors are a reliable and cheaper option for your application. At Parvalux, we can create a custom solution for your application, ensuring you have a long-lasting motor that works to your precise specification.

Depending on whether you are using it as a motor-only or in combination with a gearbox, any Parvalux permanent magnet DC motor can be built to fit your power requirements.

Learn more about Parvalux electric motors by getting in touch here: Your local contact &#; Parvalux

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