Magnet Applications – Neodymium Rare Earth Magnets World

7 Applications of Neodymium Magnets

Neodymium magnet is one type of rare earth magnets which can be seen in many daily goods including headset, voice coil motor, guitars, speakers, Halbach array, cordless tools and even hybrid vehicles.
1. Magnetic pull bait plate
Fishing is so popular. There are special fishing TV stations introducing different fishing contest, fishing tips and fishing tackle. I am sure it’s one of the best-loved hobbies all over the world. Have you ever heard magnetic pull bait plate? It’s a fishing tool to adsorb fishhook for easy bait.

2. Magnetic scrubber
Permanent magnets are widely used in aquarium cleaner because you don’t have to empty the tank or touch water any more. This also applies to narrow shape vast or glass door/window.
3. Magnetic gun mount
As all guns have something in common – metal, permanent magnets are ideal for building the gun mount. Use cheap big block ceramic magnets to build a gun mount, instead of small super-strong neodymium magnets or you can find free neodymium magnet in an abandoned computer hard drive.

4. Magnetic beer buff opener
Small beer bottle caps are everywhere when you have fun with friends? Easy in assembly, magnetic bottle opener, can hold dozens of or even hundreds of caps a time.
5. Magnetic screen door
When summer comes, how to keep annoying mosquito or bug out is a big problem for many families, especially for those family that has baby. The magnetic mesh hands-free screen door curtains are the perfect solution to this problem; they are environmental protection without the use of pesticides and allow fresh air in.
6. Magnetic jar holders
If you have many small things taking up room in your cabinets and drawers, and don’t have extra space to hold more things, let’s use magnetic jar.

7. Magnetic hanger
If you are a neat freaks and want everything in order, you’ll love this modern magnetic clothes hangers. These hook-free hangers make it easier to organize your closet.

For more information, please visit https://www.stanfordmagnets.com/

What Are Beer Loft Magnets

Neodymium magnet raw magnets are widely used in the industrial field, such as the speaker, louder speaker, sensor, motor, alternator; and also it is popular in ladies bags, purses, shoes, crafts and jewelry.

Small beer bottle caps go everywhere while having a party with our friends. Now an amazing item called magnetic bottle opener solves this problem with the combination of the permanent magnet and traditional bottle opener.

With wall-mounted design, strong neodymium magnets can grip beer bottle caps up to twenty or more depending on how strong the magnet is. Most of the time, sintered neodymium magnet with grade N52 neodymium magnet is the most common option.

Grade N52 is stronger enough and affordable magnet type. Neodymium N52 maximum working temperature is 60 Celsius degree, so keep magnetic bottle opener away from fire or other high-temperature places.

Stanford Magnets is an experienced manufacturer of permanent magnets for woodworking including big disc neodymium magnet and strong block rare earth magnets. We are happy to work with your talent design no matter how big your order is.

To choose the right shape and size of beer loft magnets, Stanford Magnets did some experiments to get the right data. We have advanced R&D center, quality control, and professional machining technicians. So if you want to design your own magnetic bottle opener, you can get a reference from us.

For more information, please visit https://www.stanfordmagnets.com/

Can Permanent Magnet Motors be Used As Generators

The biggest difference between permanent magnet generator and excitation generator is that its excitation magnetic field is generated by the permanent magnet. A permanent magnet is not only a magnetic source, but also a component of the magnetic circuit in the motor.

The magnetic properties of permanent magnets are related to the manufacturing process, the shape and size of permanent magnets, the capacity of magnetizers and the method of magnetization. The specific performance data are very discrete. Moreover, the magnetic flux and magnetic potential provided by permanent magnets in motors also vary with the material properties, dimensions of the remaining parts of the magnetic circuit and the running state of the motor.

Permanent magnet generator has a variety of magnetic circuit structures. The leakage circuit is very complex and the proportion of leakage flux is large. The ferromagnetic material part is easy to be saturated, and the permeance is non-linear. All these increase the complexity of electromagnetic calculation of permanent magnet generator and make the accuracy of calculation lower than that of electric excitation generator.

Like the alternator, the mechanical energy of the prime mover is converted into electric energy output by using the electromagnetic induction principle of the electric potential induced by the magnetic force line cut by the wire. It consists of stator and rotor. The stator is the armature that generates electricity, and the rotor is the magnetic pole. The stator is composed of armature core, uniformly discharged three-phase windings, frame, and end cover.

The magnet rotor is usually hidden pole type, consisting of excitation winding, iron core, and shaft, retaining ring, central ring, etc. The excitation winding of the rotor passes through the DC current and produces a nearly sinusoidal magnetic field (called the rotor magnetic field). Its effective excitation flux interacts with the stationary armature winding. When the rotor rotates, the magnetic field of the rotor rotates along with the same start and every turn. The magnetic wire cuts each phase winding of the stator sequentially, and induces a three-phase alternating current potential in the three-phase stator winding.

When the generator operates with symmetrical load, the three-phase armature current synthesizes to produce a rotating magnetic field with synchronous speed. The interaction between the stator magnetic field and rotor magnetic field will produce braking torque. From the steam turbine/gas turbine, the mechanical torque input overcomes the braking torque coupling and works.

Advantages of Permanent Magnet Generator

I: It has a simple structure and high reliability. Permanent magnet generator eliminates excitation winding, carbon brush and sliding ring structure of excitation generator. The structure of the whole machine is simple. It avoids burning and breaking of excitation winding, carbon brush and sliding ring structure. The structure of the whole machine is simple. It avoids burning and breaking of excitation winding, wearing and tearing of carbon brush and sliding ring of excitation generator. The reliability is greatly improved.

II: Small size, lightweight, and high specific power. The use of permanent magnet rotor structure makes the internal structure design of the generator arranged very compactly, and the volume and weight of the generator are greatly reduced. The simplification of the permanent magnet rotor structure also reduces the inertia of the rotor, increases the practical speed, and achieves a very high specific power.

III: Medium and low-speed power generation performance is good. Under the same power level, the output power of the permanent magnet generator is twice as high as that of the excitation generator at idle speed. That is to say, the actual equivalent power level of the permanent magnet generator is the excitation generator.

For more information, please visit https://www.stanfordmagnets.com/

Elevator Lifting Equipment-Electromagnet

The development of the elevator has brought great convenience to the life of contemporary people. Then the elevator lifting equipment electromagnet, its main part, namely crane, lifting machinery is widely used in lifting, transportation, loading and unloading, installation and personnel transportation of various materials in modern industrial production indispensable equipment. Crane is a kind of mechanical equipment that lifts, drops and moves materials by means of lifting hooks or other lifting devices in intermittent and repetitive working mode.
The limiter of elevation, limit of operation, buffer, an anchoring device, rail clamp or windproof shoe, safety plate, anti-tilt device, lifting weight limiter, moment limiter and anti-collision device, etc.

The Most Important Accessories of Elevator Lifting Equipment Electromagnet
Elevator lifting equipment electromagnet is a new type of magnetic lifting equipment for magnetic conductive materials such as steel plate, ingot, and scrap steel, which has strong practicability. Lifting electromagnet does not need to bind scattered materials and other treatments when lifting and transporting materials, so it is also called bulk lifting electromagnet, which is very suitable for lifting and transporting scattered scrap steel and scrap. Lifting electromagnet is the usual electromagnetic sucker for lifting.

Working Principle of Elevator Lifting Equipment Electromagnet
Elevator lifting equipment electromagnet is based on the principle of electromagnetic conversion, in the state of electrification to produce strong electromagnetic attraction, in order to control the moving or stopping state of the object. The structure of the electromagnet is reasonable and compact. The coil is placed in the soft magnetic material shell and sealed with epoxy. It has the characteristics of small size, large suction, firm, reliable, fully sealed and strong environmental adaptability. The series of electromagnets can be operated remotely with simple and sensitive action and stable and reliable function.

Applicable scope of elevator lifting equipment electromagnet: AC rated working voltage of lifting electromagnet is 220 volts. Normal temperature type lifting electromagnet is suitable for handling ferromagnetic materials whose surface temperature is below 100 C. High-temperature type lifting electromagnet is suitable for handling ferromagnetic materials whose surface temperature is below 600 C.

The function of elevator lifting equipment electromagnet is to produce strong magnetism under the condition of electrification, to absorb metal objects, and then carry them by crane. Without electricity, there is no magnetism, which is different from the permanent magnet. The advantage is that magnetism can be controlled at any time and send and receive freely.

For more information, please visit https://www.stanfordmagnets.com/

Permanent Magnet Materials for Wireless Charger

The main types of the magnetic materials are widely applied in wireless charger at present are NdFeB permanent magnets, NiZn ferrite thin disk, MnZn ferrite thin disk, soft ferrite magnetic stripe.

As the main components of wireless charging technology, a variety of absorbing material disks made of soft magnetic ferrite materials play a role of increasing induced magnetic field and shielding interference of coil. The requirement for performance, size, and reliability of soft magnetic ferrite materials is rather high in wireless charger. Nevertheless, the receiving end has a higher requirement.

Multi-coil free position type charger can work with multi-terminal at the same time. There are a number of coils arranged in its internal covered most area of the charging dock. Thus, the terminal can be freely placed in the charging dock; the charger will automatically select several efficient transmission coils to work. The working frequency is 105 kHz to 113 kHz for this type charge according to QI standard regulation. Absorbing material disk uses high Bs and low loss characteristics of MnZn power materials.

According to the way of receiver placement, wireless charging transmitter is divided into fixed position type, single coil free position type and multi-coil free position type. These transmitting terminals have different requirements for ferrite products.

Fixed position type charger applied NdFeB permanent magnet as positioning, terminal equipment must be placed on the fixed position to charge and maximize the charging efficiency. In this charger design, work frequency is 110 kHz to 205 kHz based on QI standards. The resonance frequency of fixed position type charger is high, generally using low loss, high-frequency magnetic shielding NiZn ferrite chip as a separate disk.

For single coil free position type charging equipment, there is a drive device in the internal coil which allows plane mobile. Through setting position from the automatic detection device, moving the coil to this position, making the position of the coil in line with the position of terminal receive, eventually realize charging and increasing the charging efficiency. With this design, the receiver can be placed at any position on the charging panel. Based on the QI standard, the working frequency is 140 kHz for this charger. Due to movement requirement of the coil, absorbing material disk must be high reliability. It needs to use a flexible magnetic disk produced by the taper-casting process.

Permanent magnet materials applied to the wireless charging system, on the one hand, enhance magnetic flux between transmit and receive coil, improve transmission efficiency; on the other hand, as a positioning device between transmitting and receiving, facilitate fast and exact positioning of the terminal. Small wireless charging equipment mainly uses NdFeB permanent magnet materials; large wireless charging equipment can use ferrite magnets instead of neodymium permanent magnet materials to reduce the cost.

For more information, please visit https://www.stanfordmagnets.com/

NdfeB Magnets for Electrical Fields

With the increasing performance of permanent magnet materials, rare earth permanent magnet materials are widely used in electrical fields.
Using high-performance rare earth permanent magnet materials to make a motor, the structure does not require special electrical excitation system, which helps to improve motor efficiency and power factor, and save energy, to reduce the size of the motor.

Currently in the design of permanent magnet motor, the general assumption that a uniform distribution of the various parts of the magnetic field of the permanent magnet and the magnetic properties of the same batch of neodymium magnets can be the same, while the need to use a permanent magnet demagnetization curve of permanent magnet at room temperature under suppliers, intrinsic connectivity magnetic parameters, residual magnetism, such as density and maximum energy product.

However, since the manufacturing process and the level of the plant and other reasons, there is a temperature in each portion of a permanent magnet hereinafter actual performance differences and the performance of the same group of permanent magnets is different.

The magnetic properties of the permanent magnet
The permanent magnet motor in normal operation can be closely related to the magnetic permanent magnet.
The strong magnet motor can directly determine whether reliable operation.
When the permanent magnet motor is running, sometimes the rotor temperature is high and NdFeB irreversible demagnetization will happen, causing permanent magnet synchronous motor efficiency and power factor and other performance indicators deteriorated.

What Magnet to Use for The World’s Smallest Phone Charger

Today, I will introduce the world’s smallest phone charger – The Nipper.
Comprised of two tiny 17mm x 17mm x 17mm squares, this super handy charger stay together with the use of three strong neodymium block magnets and a small leather strap, weighing only 10g and is as small as key ring accessories.

This Nipper charger is originally designed for emergency use utilizing magnetic force to hold two AA batteries (one of the most common household items) in place between the squares. Meanwhile, it is equipped with a micro USB connector that makes it compatible with Samsung, HTC, LG, and any other devices with this type of port.

Here is a key component – Sintered Neodymium Magnet
The magnets in the Nipper charge are the strongest magnet king- neodymium magnets. These three magnets have two functions of holding the batteries together while at the same time making an electrical connection to the circuit board. This circuit is called a boost converter, it turns the power from the batteries into a 5v power supply, and then it can charge your phone.

The use of powerful neodymium magnet also saves the connected components, come to simplify the structure, manufacturing technique and raw material saving. Hope this product can inspire you to consider other applications of super-strong rare earth neodymium magnet.
You probably already know that permanent strong neodymium magnets have a very strong magnetic force.

But do you know other properties of the magnet, like conductivity?

Yes, we all know, the magnet is conductive!
Strong permanent magnet contains many metallic elements, such as nickel, cobalt, and iron. All these are electrically conductive. So all strong magnets are conductive, only the degree of electrical conductivity is different.

For more information, please visit https://www.stanfordmagnets.com/

What is Halbach Array Linear Motor

Traditional motors such as DC motor, synchronous motor, induction motor, and variable reluctance motor can be used as electromagnetic actuators, but using rotating motor as actuator has advantages and disadvantages. DC motor control is simple, but the existence of brush makes DC motor need to be maintained regularly and not suitable for vacuum working environment; induction motor control is more difficult; variable magnetism motor. The cogging force caused by the cogging of the resistance motor will bring the difficulty to precision positioning.

Synchronous motors are more suitable for lithographic operation. In order to avoid magnetic resistance and cogging force, they can adopt the structure without iron, cogging and winding surface mounting.

The traditional planar positioning system transforms the rotating motion of rotating motor into linear motion by gear, ball screw, and other transmission mechanisms. Because of the problems of backlash, friction and uncertain ball motion, it is difficult to carry out high precision positioning. As a result, technicians are forced to relocate on the workbench. A precise worktable is set up for micro-displacement correction. This kind of multi-action substructure positioning platform has a huge system and slow response.

In high precision plane motor control, compared with rotary motor drive, the direct drive of permanent magnet linear motor has the advantages of no mechanical noise and additional transmission error; no additional mass, such as lead screw, can obtain greater acceleration and faster response; linear motor can not only produce unilateral force but also can produce. The vertical force can be used as a two degree of freedom actuator. Ordinary permanent magnet linear motor only uses the single-layer primary magnet. The harmonic component of the magnetic field along the space is large and the amplitude of fundamental component is small, so it can not produce large electromagnetic force. Ordinary permanent magnet linear motor adopts three-phase control. The winding arrangement is complex, the winding end effect is large, and the cooling condition is poor, which affects the operation of the linear motor.

The magnetic field of Halbach permanent magnet array shows obvious unilateral characteristics. The magnetic field on one side is significantly enhanced, and on the other side is significantly weakened. The magnetic field on the strong side has good sinusoidal distribution characteristics, and the high-order harmonics are small. The linear motor with Halbach permanent magnet arrays can improve some shortcomings of ordinary permanent magnet linear motor.

The Neodymium Halbach Arrays are specialized magnetic assembly consisting of Neodymium Iron Boron (NdFeB, NIB, Neo) permanent magnets assembled in such a way as to provide a controlled (uniform and homogenous) and high magnetic field strength without the use of ferromagnetic materials.

This Halbach Array is a cylinder / ring-shape with a dipole (2 poles) pattern in the central air gap. The magnetic field within the ring is uniform (parallel field lines which are homogenous) across the entire central hole and of high strength (above 10000 Gauss or 1 Tesla), both being features of this style of Halbach Arrays.

The Neodymium Halbach Array ring magnet is made from 8 magnets (45-degree arc segments, each with a specific direction of magnetization). Each arc part has the direction of magnetization such that the magnetic field traverses the central air gap and is then ‘guided’ through and around the magnet material itself.

What Should We Know About Magnets?

Magnets are composed of iron, cobalt, nickel and other atoms, the internal structure of the atom is relatively special, it has a magnetic moment. Magnets can produce magnetic fields and attract the properties of ferromagnetic materials such as iron, nickel and cobalt.

Different types of magnets have different uses.

Classification of magnets:

Shape magnets: square magnet, arc magnet, special-shaped magnet, cylinder magnet, ring magnet, disc magnet, bar magnet, magnetic frame magnet.

Attribute magnets: SmCo magnets, NdFeB magnets (powerful magnets), ferrite magnets, AlNiCo magnets, Fe-Cr-Co magnets;
Industry magnets: magnetic components, motor magnets, rubber magnets, plastic magnets and so on.

Magnets are divided into permanent magnets and soft magnets. Permanent magnets are added with strong magnets, so that the spin of magnetic materials and the angular momentum of electrons are arranged in a fixed direction. Soft magnets are added with electricity. It is also a way of adding a magnetic force. If the current is removed, the soft iron will slowly lose magnetism.

The use of different types of magnets:

1. Neodymium iron boron permanent magnet is a modern permanent magnet with strong magnetism, and its application is also extensive.

It is mainly used in electroacoustics, permanent magnet rotor, communications, automotive electronics, magnetic machinery, aerospace, computer, household appliances, medical equipment, office automation, toys, packaging boxes, leather products, magnetic accessories and other fields.

2. Permanent magnet ferrites are used as permanent magnets in electric meters, generators, telephone sets, loudspeakers, television sets and microwave devices. They are also used in recorders, pickups, loudspeakers, and magnetic cores of various instruments. They are used in radar, communications, navigation, telemetry and other electronic devices.

3. SmCo magnets can operate at temperatures up to 300 degrees, and have corrosion resistance and oxidation resistance. They have been widely used in detectors, generators, radar, instrumentation, and other precision science and technology fields.

4. Al-Ni-Co magnets are high temperature resistant and corrosion resistant. They are mainly used in motors, sensors, medical instruments, manual tools, loudspeakers and various instruments.

5. Rubber coated magnets have the same and different characteristics, the same suction is weak, mainly used for publicity (refrigerator stickers, car stickers, etc.), decorative gifts, refrigerator stickers, toys, teaching materials and other areas.

New Discoveries of Magnets in Battery Applications

Application of magnet in the battery field

In recent years, power generation bacteria have become a hot topic. Scientists have discovered that bacteria found on the global seabed and river bed can harvest electrons from tiny metal particles. By donating electrons to bacteria, iron particles become an effective source of energy for cells. Other types of bacteria make new discoveries in the field of batteries by “dropping” excess electrons onto metal particles to effectively breathe electrons.

James Byrne and colleagues from the University of Tibingen in Germany have discovered that a common magnetic mineral, the tiny, powerful magnetite grains, can act as both an electron acceptor and an electron donor, thus working as efficiently as a battery. He allowed a community of Enterobacteria and Rhodopseudomonas bacteria to grow on magnets, and then discovered that Enterobacteria could “drop” electrons onto crystals from which Rhodopseudomonas obtained electrons.

For bacterial communities, magnetite crystals act like natural rechargeable batteries: charged by terrestrial bacteria, and consumed by Rhodopseudomonas. Depending on the needs of bacteria, powerful magnets can be used as conductors or as “storage tanks” and sources of electrons.

New magnets can be used to develop the new generation of sensors and actuators.

Researchers at Temple University and the University of Maryland have discovered a new type of magnet that expands in size when placed in a magnetic field and wastes negligible amounts of heat during energy collection. This new discovery has tremendous application potential and is expected to not only replace existing technologies, but also create new applications.

Hash Depp Chopra, chairman of the Department of Mechanical Engineering at Temple University and director of the Laboratory of Materials Genomics and Quantum Devices, and Manfred Utig, professor of materials science and engineering at the University of Maryland, published their findings in the 21st issue of Nature. “Our findings fundamentally changed our understanding of a particular type of magnet that we have known since 1841,” Chopra said.

In the 1940s, British physicist James Joule discovered that when placed in a magnetic field, ferromagnetic materials changed their shape, but their volume remained unchanged. This phenomenon is called “Joule magnetostriction” and has been shown in all magnets for 175 years since its discovery.

“We have discovered a new class of magnets, which we call non-Joule magnetostrictive magnets. In the magnetic field, their volume has changed greatly. Moreover, these non-joule magnets have the extraordinary ability to collect or convert energy with minimal heat loss,” Chapla said.

Chopra and Utig heated a specific iron-based alloy in a furnace to about 760 degrees Celsius for 30 minutes, then cooled it to room temperature quickly, which was when the material exhibited non-joule magnetostrictive behavior.

They found that the heat-treated materials contained tiny honeycomb-like structures that had never been seen before, which was the key to their non-Joule magnetostriction in magnetic fields. “Knowing this unique structure will enable researchers to develop new materials with the same properties,” Utig added.

The researchers pointed out that the conventional rare earth magnet could only be used as an actuator to exert force in one direction due to the Joule magnetostriction. Even if actuated in only two directions, a large number of bulky magnets are required, which increases volume and decreases efficiency. Non-joule magnets can expand in all directions at the same time, so making compact omnidirectional actuators will be easy to achieve.

Because these new magnets also have energy-saving characteristics, they can be used to create a new generation of sensors and actuators with very low heat loss, and can be used in aerospace, automotive, biomedical, national defense, space exploration, and robotics and other fields.

Researchers also say the new magnet contains no rare earth elements, so it can replace the existing expensive but low mechanical properties of rare earth-based magnetostrictive materials.