Hot - pressed NdFeB magnets stand out in the magnet market with a unique set of performance characteristics that make them suitable for specific high - end applications.

High Magnetic Performance

One of the most remarkable features is their high magnetic performance. For example, the radial maximum magnetic energy product of hot - pressed NdFeB magnet rings can reach 240 - 360 kJ/m³. This high magnetic energy product allows for the generation of strong magnetic fields, which is crucial in applications such as electric motors. In servo motors and EPS motors, the strong magnetic fields produced by these magnets enable efficient conversion of electrical energy into mechanical energy. The high magnetic strength also contributes to the compact design of motors, as a smaller magnet can achieve the same or better performance compared to other types of magnets, reducing the overall size and weight of the motor.

Anisotropic and Uniform Magnetic Properties

These magnets are typically radially - oriented, and the radial magnetic performance is highly uniform. In motors, this uniformity ensures silent operation and smooth torque output. When the magnetic field distribution is even, there are no sudden fluctuations in the magnetic forces acting on the motor's rotor, resulting in a more stable and vibration - free rotation. This is especially important in applications where noise and vibration need to be minimized, such as in high - precision servo systems used in robotics and aerospace equipment.

Good Heat Resistance

Hot - pressed NdFeB magnets exhibit excellent heat resistance, with a working temperature that can reach up to 180 °C or even 200 °C in some cases. This property makes them suitable for use in environments where elevated temperatures are present, such as in automotive engines or industrial machinery. In automotive applications, the engine compartment can get extremely hot, and the magnets in the EPS motors or other engine - related components need to maintain their magnetic properties under these high - temperature conditions. The heat resistance of hot - pressed NdFeB magnets ensures that they do not demagnetize easily, providing reliable performance over a wide temperature range.

Corrosion Resistance

The manufacturing process of hot - pressed NdFeB magnets, which often involves a nanometer - crystalline structure, contributes to their good corrosion resistance. Additionally, they are often coated with materials like epoxy resin. The epoxy resin coating, with a thickness typically in the range of 20 - 35 μm, acts as a protective barrier against environmental factors such as moisture and chemicals. This corrosion resistance is vital for ensuring the long - term durability of the magnets, especially in applications where they are exposed to harsh operating conditions.