Bonded NdFeB Magnets

Bonded NdFeB Magnets

Generally, the bonded NdFeB magnet is produced by molding compression of the compound NdFeB alloy powder with epoxy resin, also it can be made by injection or extrusion from NdFeB alloy powder mixed with plastic. The characteristics are as follows:
1、Higher Magnet Property: the magnet property of bonded NdFeB magnet is between that of sintered NdFeB and ferrite, and with good consistency and stability.
2、Large Freeness of Product Shapes and High Precision of Dimension: the magnet shape and dimension are decided by the tooling, like ring, segment, block, etc., without further sintering and mechanical machining processes. 3、Good Corrosion Resistance: after electrodeposited or through other special treatments, it can be used under normal or unfavorable environment conditions for a long time.
4、Diverse magnetization: Multi-pole magnetization and screw angle magnetization are available, and the field distribution could be square, sinusoid and so on.
5、It has high production efficiency, suitable for mass production. The bonded NdFeB magnet is mainly used for all kinds of micro–miniature motors, such as spindle motor, stepping motor, synchronous motor, DC motor and brushless DC motor. It can replace sintered NdFeB magnet and ferrite, making motor assembling simpler and more reliable, reducing costs and improving efficiency。

Hot Pressed NdFeB Magnets

The hot-pressed NdFeB magnets by Chengdu Galaxy Magnets include two types, hot-pressed isotropic NdFeB magnet (MQ2) & hot-extruded anisotropic NdFeB magnet (Mq3).
The hot-pressed isotropic NdFeB magnet is produced through compression by rapidly quenched NdFeB magnetic powder under high temperature.
The hot-extruded anisotropic NdFeB magnet is mainly anisotropic radially-oriented ring magnet, which is produced through compression and extrusion deformation by rapidly quenched NdFeB magnetic powder under high temperature, with characteristics as the following:
1.High magnetic performance, with the radial maximum magnetic energy product of ring magnet reaching 240～360kJ/m3;
2.The magnet ring is radially-oriented with uniform radial magnetic performance, which can guarantee motor’s silent operation and smooth torque output;
3.High heat-resistance, with working temperature reaching 180℃;
4.The magnetizing poles and pole declination angle of the magnet ring do not have to be reserved, which can be realized through design of changing magnetization coils, with freely using and enough adjustment by customers.
5.The magnetization waves of magnet ring can be customized and magnetized as square wave, sine wave and other special magnetization waves;
6.The magnet ring without assembling can be realized multi-polarization and magnet pole declination, which is convenient for motor assembling;
7.The magnet ring is nanometer crystalline structure with high density and ED coated by epoxy resin with excellent corrosion resistance;
8.The ED coating thickness of epoxy resin can be reached 20~35μm;
The hot-extruded anisotropic radially-oriented ring magnets are mainly applied on EPS motors, servo motors, motors for electric tools and kinds of DC motors.

Bonded NdFeB Magnetic Properties

Bonded NdFeB Surface Treatment

Notes: Some images reference to Magnequench's Bonded Neo Magnetization Gui

Bonded NdFeB Magnets Production Process

Compression Molded Magnet

Injection Molded Magnet

Bonded NdFeB Magnets Dimensions

Magnets could be made in many shapes with below
1.Pressing Bonded Ndfeb Magnet as a shape, size precision better than NdFeB;
2, the working temperature is high, Tw = 150 ℃
3,Thin ring magnet, the thinnest thickness of thin ring magnet 0.5mm.
4,High Thick ring magnet its , a pressing, can do 40-45mm, 40-45mm thickness.
5, Biggest arc magnet, the large diameter ring magnet can do 120-140mm,

Bonded NdFeB Magnets Magnetization

We have nearly 20 years of experience in designing magnetic circuit and in magnetizing coil design and manufacturing. The magnetization wave form could be square, sinusoid and so on. We customize all of our magnetizing coil and magnetic circuit to satisfy customer’s unique needs. With our unique technology and rich experience of processing magnetic materials, we are able to magnetize the magnetic materials to its maximum capacity ,mean while,lower the cost for our customers. And we can provide the customer with all aspects of magnetizing coil and magnetic circuit design solutions. We provide a variety of different magnetization:
1. Outer circle polar magnetization.
2. Inner circle polar magnetization.
3. End surface, single-sided or double-sided magnetization.
4. Skewed angle magnetization
5. Radial magnetization.
6. The combination of the above magnetizaion methods.Exa

Examples of Magnetization ppictures

Axial magnetization

Diametrical magnetization

Outer-diameter multi-polar magnetization

Inner-diameter multi-polar magnetization

Radial magnetization

Surface magnetization

Skewed magnetization

Complex magnetization

Encoder magnetization

Notes: Some images reference to Magnequench's Bonded Neo Magnetization Guide.

Bonded NdFeB Magnets

Through injection, bonding or other methods, the magnet is formed as rotor assembly in connection with shaft, iron core and hub,
High precision of dimension, high-class coaxiality and concentricity and excellent properties of dynamic balance that all ensure HDD spindle motor a reliable and smooth operation at a speed of 7200RPM(even up to 12000RPM when applied to server)with low noise. No dust, no magnetic particles, no organic contaminants and inorganic contaminants strong corrosion resistance that all can guarantee long safety of data in HDD

Plastic –Injection Assembly

Plastic –Injection Assembly