Magnetic Products: 六月 2019

2019年6月30日星期日

How to Judge Quality of Neodymium Iron Boron Magnet

How to Judge Quality of Neodymium Iron Boron Magnet

Neodymium Iron Boron Magnet Quality – In the past 30 years, with the extensive development of magnet products, NdFeB magnets have been widely used in various industries, especially in magnetic levitation, electronic digital products and other industries. In the past 30 years, there have been many different brands. Consumers are also confused about how to judge the quality of NdFeB magnets. MPCO Magnetic Industry Co., Ltd. tells you to judge the advantages and disadvantages of NdFeB magnets, which should be considered from three aspects: magnet performance, magnet size and magnet coating.

Control of raw material production to ensure the performance of the magnet: First, consider whether the raw materials used by NdFeB manufacturers meet the national standards, and second, consider the advanced production technology of NdFeB magnet manufacturers. At present, advanced technologies include sheet ingot casting technology, hydrogen crushing technology and jet milling technology. Secondly, we should consider whether to adopt the two-part compression molding method, which is also the characteristics of the production of NdFeB magnets in China. Finally, we should monitor quality during the production process. PFM can be used for effective detection. We can select the desired NdFeB magnet model by looking at the various magnet parameters.

How to Judge Neodymium Iron Boron Magnet Quality

Machining ability to ensure the size of the magnet: NdFeB magnets have various shapes, and different shapes of NdFeB magnets have different sizes. It is difficult to form in one production in normal production, and it has to go through cutting and production processes. The size of high-quality magnets also has a large impact, and the size of the magnet depends on the processing capacity of the factory. Because only in this way, we can continue to meet the needs of our customers while saving manpower and resources and making the company more competitive.

The quality of the coating determines the life of the magnet: a magnet without a magnet coating has a life of 20-30 years at 51 ° C in 150 ° C air and needs to be plated on the surface. In the prior art, a layer of insulating material is usually plated on the surface of the magnet to prevent external substances from corroding the magnet. Currently, nickel, copper and other chemical substances are commonly used for isolation, but in some special cases, the phosphating method should be used. The customer should select the plating process according to the product work requirements.

In summary, to judge the quality of NdFeB magnets, it is necessary to understand the production process and fully understand its performance, size, plating and so on.

Plastic Isotropic NdFeB Bonded Magnets

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Isotropic NdFeB Injection Magnets

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Injection Moulded NdFeB Magnets

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Precise Inject Magnet

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2019年6月28日星期五

The Future Development Trend of NdFeB Magnets

The Future Development Trend of NdFeB Magnets

After the effective control of rare earth NdFeB magnets in the past two years, the price tends to be stable, the rational development and utilization of rare earth minerals are effectively controlled, and the production of rare earth magnet raw materials is gradually stable. The raw material prices are stable throughout the market, then, NdFeB is strong. The price of magnet products is relatively stable. Now it is the Internet age. The price of products is very transparent. When the quality of products is the same, the unit price of products is naturally transparent. If you put a product on the Internet, the price advantage is very obvious. Therefore, product competition depends on products, and product competition depends on quality. Development Trend of NdFeB Magnets

Development Trend of NdFeB Magnets In the face of the harsh market competition, the price of NdFeB magnets is also easy to dwarf. The market form of these two years is not good. The development of magnet products has reached a stage of white heat, and each manufacturer faces a harsh production environment. Have to carry out the lowest price war, because these manufacturers have limited production capacity, it is only a simple product processing method, without their own special product advantages, since the survival of a company, the only way is to use price and service to maintain A manufacturer survives and competes for orders.

On the other hand, if these manufacturers can fundamentally solve their own problems, break through their own production technology problems, break through their own problems from the product quality product advantages, anti-passive initiative, when their own products and quality have advantages, the enterprise itself It has obtained the initiative right, and in the face of customers, the company has enough right to speak, not only can avoid price competition on the product, but also firmly grasp the customer’s demand for products and long-term cooperation and development.

Throughout the development process of various enterprises, it is not the technology to promote products, the products to occupy the market, the market to drive the development of enterprises, so when a company begins to carry out price wars, rather than breaking through product technology as the development direction, Then, the development of this enterprise will not see hope, because the market is cruel, the competition is realistic, and the low-end products will not be able to adapt to the needs of market development and will be eliminated.

Enterprises must develop, products must be updated, and technology must be constantly Breakthrough, meet market development needs, and meet customer product needs, magnet companies must break through the technology to break through existing production models.

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Injection Molded Ferrite Magnets

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Ferrite Bonded Injection Magnets

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2019年6月26日星期三

Permanent Magnet used in Medicine

Permanent Magnet used in Medicine

Today we are talking about magnets. With the development of the times, magnets have gradually entered every corner of our lives. But do you know? Magnets not only have good value in industry, but also magical effects on magnets in medical applications. Let’s take a look at them together! Analgesia: Magnetic therapy using magnets can improve blood tissue nutrition, overcome pain caused by iron deficiency, hypoxia, inflammatory exudation, swelling and compression of nerve endings and painful substances; magnetic field can increase pain-causing substance hydrolase

The activity causes the pain-causing substance to hydrolyze or transform to achieve the purpose of relieving pain; the magnetic field can stimulate the acupuncture points, dredge the meridians, reconcile the blood, and reduce the excitability of the peripheral nerves through the nerve reflex under the acupoints, thereby achieving the analgesic effect. Anti-inflammatory swelling: Biological inflammation is caused by bacteria, viruses, parasites; abiotic inflammation is caused by low temperature, high temperature, various toxicity, mechanical trauma and so on.

Magnet used in Medicine Magnet used in Medicine Antihypertensive and lipid-lowering: The magnetic field can strengthen the inhibition process of the cerebral cortex, regulate the autonomic nerves, strengthen the microcirculation function of the body, and lower the blood pressure; the magnetic field can make the long carbon chain of cholesterol into a short chain and become polycrystalline. The center, together with the rotation of red blood cells, makes the cholesterol easy to settle on the blood vessel wall, and is easy to discharge, so it has a blood lipid lowering effect.

Sedation: Magnetic therapy has certain regulation effects on meridians, nerves and body fluids. It can not only improve sleep, promote sleep and prolong sleep time, but also relieve muscles and relieve itching. Inhibition of tumors: excessive tumors, such as fibroids, lipomas, etc., can be reduced or disappeared; for malignant tumors, such as digestive tract tumors, etc., can also improve symptoms, inhibit growth or reduce the mass.

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Anisotropic Bonded NdFeB Radiantion Ring

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Anisotropic Plastic Bonded Magnets

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2019年6月24日星期一

What are the difficulties when cutting ferrite magnets

What are the difficulties when cutting ferrite magnets?

A ferrite magnet is a metal oxide having ferromagnetism. In terms of electrical characteristics, ferrite magnets have much higher electrical resistivity than metal and alloy magnetic materials, and also have higher dielectric functions. The magnetic function of the ferrite magnet also exhibits a high magnetic permeability at high frequencies. Therefore, ferrite magnets have become a non-metallic magnetic material commonly used in high frequency and low voltage applications. Due to the low magnetic energy and low saturation magnetization (usually only 1/3 to 1/5 of pure iron) stored in a unit volume of a ferrite magnet, ferrite magnets require low frequency, high power and high power at higher magnetic energy density. The use of borders is limited. cutting ferrite magnets cutting ferrite magnets

Classification of ferrite magnets The ferrite magnet is sintered from iron oxide and other components. Generally, it can be classified into a permanent ferrite magnet, a soft ferrite magnet, and a rotating ferrite magnet. The ferrite magnet is also called ferrite magnet magnet, which is a small black magnet we see every day. Iron oxide, barium carbonate or barium carbonate is the main raw material.

After magnetization, the strength of the residual magnetic field is very high and can be maintained for a long time. Usually used as a permanent magnet material. For example: speaker magnet. Soft ferrite magnets are prepared by sintering iron oxide and one or more other metal oxides. It is called soft magnetic because the residual magnetic field is very small or almost absent when the magnetizing magnetic field is dissipated. It is commonly used as a choke coil or core for intermediate frequency transformers. The spin magnetic ferrite magnet refers to a ferrite magnet raw material having spin magnetism.

The rotating magnetic property of the magnetic material refers to the phenomenon that the plane-polarized electromagnetic wave continuously rotates around the propagation target during the propagation of the electromagnetic wave within the raw material according to the determined target under the action of two perpendicular DC magnetic fields and electromagnetic wave magnetic fields. Spin ferrite magnets are widely used in microwave communication.

Difficulties in die cutting of ferrite magnets: The raw material is basically in the form of a sheet, which is thin, high in quality, and brittle, and is cracked by gently lifting it with a finger. Under normal stress conditions, the split does not split with the stressed target.

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Multipolar Anisotropic NdFeB Ring Magnets

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Anisotropic Plastic Bonded Neodymium Magnets

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2019年6月22日星期六

how magnets are produced

how magnets are produced

Due to the wide variety of magnets, the usual manufacturing method is to sinter rare earth permanent magnets. For raw materials such as samarium cobalt and neodymium iron boron, sintering is carried out under vacuum or a protective atmosphere, post-treatment and mechanical processing, and the processing components are pure metals or alloys. In addition, ferrite permanent magnets can also be used as processing materials.

Of course, the use of AlNiCo as a raw material is also a good choice. No matter what kind of raw materials are processed, they need to be manufactured better, so that the quality can be better determined and the reliability can be improved. how magnets are produced how magnets are produced As for how magnets are made, choosing well-known manufacturers to process them will play a better role in quality and thus produce better results in terms of quality. Therefore, scientific choice will be the basis for seeking better quality.

When choosing a product, we should evaluate the quality of the product in order to achieve better results in terms of reliability, which is naturally the basis for seeking better service. Of course, in the process of magnet sintering, we can use more advanced technology and suitable raw materials to produce various types of magnets for consumers.

Of course, when we make choices, we still need to make better decisions in order to play a better role in the use. After all, a better service organization is more worthwhile, so reliability is more satisfying. Using more advanced technology to process magnets and find well-known manufacturers to handle them will play a greater role in quality. Only when we have better quality can we be accepted by more consumers.

Of course, this is also the basis for seeking better service. Therefore, we still need to choose better so that we can perform better in quality.

Anisotropic Compression Moulding Bonded Magnets

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Bonded NdFeB Anisotropic Radial Ring Magnet

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NdFeB Compression Bonded Anisotropic Magnets

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2019年6月20日星期四

Determine Strong Magnet Quality

Determine Strong Magnet Quality

NdFeB magnets are popular word products in the market. At present, the demand in China’s market is getting bigger and bigger, and the bidding is getting bigger and bigger. Many magnet manufacturers have better competitive advantages in the market. Will reduce the cost by using inferior raw materials. Therefore, when buying a powerful magnet, you must know how to distinguish the quality of the powerful magnet, so that we can buy a better quality powerful magnet.

Strong Magnet Quality Strong Magnet Quality Identification method: Judging the quality of a powerful magnet is mainly analyzed from two angles: magnet performance, magnet appearance Strong magnet performance: The standard for the performance of strong magnets is that there is no uniform standard. When distinguishing, it is only necessary to investigate the relevant parameters of the powerful magnet, such as magnetic energy product, coercive force and residual magnetism. It is impossible to distinguish the magnetic energy product of a powerful magnet with a Gauss meter or a flux meter in a powerful magnet of different specifications. Only the static magnetic characteristic tester can be used at this time. NdFeB magnet appearance: The inspection of the appearance of strong magnets mainly includes five categories:

1. There are scratches on the magnet (including scratches, line marks, knife marks, etc.)
2. There are pitting on the magnet (including pitting, pockmarks, bubbles, scars, slag layer, partial over-thickness, electroplating)
3. There are cracks on the magnet (including cracks, cracks, etc.)
4. There are edges on the magnet (including edge, chipping, material residue)
5. Blisters (including sand holes, pores, pinholes, particles, etc.) to see if there is a missing corner, whether the plating is intact, whether the size meets the design requirements;

NdFeB generally has a plating layer to protect it from corrosion, Rusty. In general, magnets of the same specification are placed on a flat surface that can be adsorbed to distinguish the magnitude of the magnetic force. If you really have a magnet, please come to our MPCO Magnetics Co., Ltd. or call our hotline. We are a collection of samarium-cobalt magnets and neodymium-iron-boron magnets, as well as ferrite and rubber magnets. Manufacturers, we can help you to customize the right price according to your actual requirements and affordable, absolutely will not appear on the Internet to reduce the size of the material to do the bad behavior, our word of mouth is not said to be through the vast customer base Set up. If you are eager to use or want to find the spot directly, you can place an order directly on our network sales platform www.mpcomagnetics.com In order to facilitate the needs of all kinds of customers, our company’s various regular sizes are available in stock, under Single delivery is quick and easy.

Multipole Ring Bonded NdFeB

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Bonded NdFeB Multipole Magnetic Sensor Ring

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Permanent Bonded NdFeB Magnet Rotor

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2019年6月18日星期二

Modeling Eddy Current Losses in Permanent Magnet Motor

Modeling Eddy Current Losses in Permanent Magnet Motor

Let’s begin with our model geometry. In this example, we have a 3D model of an 18-pole PM motor. To reduce computational efforts and capture the full 3D behavior of the motor, we use sector symmetry and axial mirror symmetry. You can see an animation of the full motor design below. This includes the rotor and stator iron (gray), stator winding (copper), and permanent magnets (blue or red depending on radial magnetization). To model the conducting part of the rotor, we use MPCO. For the nonconducting parts of the rotor and stator, we use a magnetic flux conservation for the scalar magnetic potential.

The construction of Modeling Eddy Current Losses in Permanent Magnet Motor Using a built-in physics interface for rotating machinery, it is easy to model the rotation of the motor. We model the center of the geometry, which houses the rotor along with a section of the air gap, as rotating in relation to the stator’s coordinate system. Note that an assembly is required in this case, as the rotor and stator are constructed as two separate geometric entities.

To calculate and store the eddy current loss density within the magnets over time, we use an additional variable. While not included in this model, the variable can also be used in a later heat transfer analysis as a time-averaged distributed heat source. Because the thermal time scale is often significantly larger than the time variance for the eddy current losses, it is usually necessary to separate the electromechanical and thermal analyses for computational efficiency. Permanent magnet motors are useful in various high-end applications, but they come with design limitations.

One example is their sensitivity to high temperatures, which can result from heat losses generated by currents — specifically, eddy currents. includes functionality to capture eddy current losses in the permanent magnets of such motors. Engineers can use these results to better understand the full behavior of permanent magnet motors and identify ways to optimize their performance. While PM motors are valued for the energy savings that they provide, there are some design limitations to address. For example, permanent magnets are sensitive to high temperatures. Such temperatures can occur when currents, particularly eddy currents, generate heat losses.

Although laminating the steel/iron section of the rotors helps to reduce eddy currents in these areas, manufacturing limitations make this challenging. As such, the heating that permanent magnets experience can be rather substantial. Permanent Magnet Motors Power High-End Applications Saving energy is a common goal shared by industries across the world. Take the transportation sector, for instance. Just last year, China introduced a new high-speed subway system that offers significant energy savings. Meanwhile, the oldest operating ferry in Finland traded in its diesel fuel engines for an electric design. And on the streets of London, a well-known luxury brand debuted its first all-electric vehicle.

These examples showcase the evolution of transportation toward a greener future. But what they also highlight is the use of a particular device to achieve this: permanent magnet (PM) motors. These types of motors, which use magnets instead of windings in the rotor, help power a range of high-end applications. The most notable of these uses is in electric and hybrid vehicles.

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2019年6月16日星期日

Ferrite Magnets Overview

Ferrite Magnets Overview

Ceramic magnets are permanent magnets made up of a composite of iron oxide and barium/strontium carbonate. Through pressing and sintering ceramic magnets are made. These magnets are also made in different grades. They are widely used magnets with good magnetic strength and resistance to demagnetization. The color of ceramic magnet is charcoal gray and they normally appear in the forms of discs, rings, blocks etc.

Ferrite Magnets Features Since the ceramic refrigerator magnets are hard and brittle in nature therefore for their finishing they require diamond cutting or cutting wheel. They can acquire only simple shapes. These magnets have excellent intrinsic coercive force. As compare to other rare earth and alnico magnets they are less expensive. They are available in different grades like 1, 5, 8 of which grade 8 is the strongest. Ceramic magnets have low service temperature as compared to rare earth magnets. Ferrite Magnets Applications Ceramic Refrigerator Magnets DC permanent magnet motors DC brushless motors Speaker magnets Magnetic resonance imaging Separators that is it separates ferrous material from non-ferrous materials In magnetic assemblies meant for lifting, holding, retrieving, and separating Food processing industries

Magnetic Properties

Grade	Remanence(Br)		Coercivity Force(Hcb)		Intrinsic Coercive Force(Hcj)		Max. Energy Product(BHmax)		Maximum Operating Temp.
Grade	mT	kGs	kA/m	kOe	kA/m	kOe	kJ/m3	MGOe	Maximum Operating Temp.
Y10T	≥200	≥2000	≥125	≥1600	≥210	≥2600	≥6.5	≥0.8	250 ℃
Y20	≥360	≥3600	≥135	≥1700	≥140	≥1760	≥20.0	≥2.5	250 ℃
Y25	≥380	≥3800	≥144	≥1800	≥150	≥1880	≥24.0	≥3.0	250 ℃
Y30	≥390	≥3900	≥184	≥2300	≥188	≥2350	≥27.6	≥3.4	250 ℃
Y30BH	≥390	≥3900	≥240	≥3000	≥256	≥3200	≥27.6	≥3.4	250 ℃
Y35	≥410	≥4100	≥208	≥2600	≥212	≥2660	≥30.4	≥3.8	250 ℃

For magnetization of ceramic ferrite magnets, moderate magnetizing field is necessary. Normally it is desirable to magnetize the magnet with a mild steel element such as a motor housing or backing-plate. The anisotropic ceramic magnets results in a single direction of magnetization.

Ferrite Magnets Machining The ceramic ferrite magnets are brittle hence it is necessary that special care and attention must be taken while machining. Normally diamond tools and some abrasive are used for the fabrication of this magnet. Once the magnet is fabricated, it is magnetized.

Sintered Ferrite magnets are used in many fields, and is manufactured by powder metallurgy. Properties include isotropy and anisotropy with Ba and Sr. This permanent magnet has difficult demagnetization, is rust resistant, and can work at 250℃. Ferrite is rigid and crisp, which can be cut and machined using diamond, dies are made with steel alloy. The sintered hard ferrite magnets are available in isotropic magnet and anisotropic magnet. The sintered ferrite magnet has high hardness. It means that can only used diamond tools cutting, grinding techniques can be used to manufacture these products. Attention is required during production & transportation due to their brittle nature.

Anisotropic Injected Bonded Magnets

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Anisotropic Compression Moulding Bonded Magnets

Bonded NdFeB Anisotropic Radial Ring Magnet

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