Why is the application of sintered NdFeB magnets in micro motors so important?
Publish Time: 2025-03-12
The reason why the application of sintered NdFeB magnets in micro motors is so important is mainly attributed to the following key factors:1. High performance magnetic propertiesHigh coercivity: The coercivity of sintered NdFeB ranks among the top among all rare earth permanent magnet materials, and increases linearly with the increase of temperature. This means that even in high temperature environments, the magnets can maintain stable magnetism and are not easy to demagnetize.High saturation magnetic induction intensity: Its saturation magnetic induction intensity can reach more than 1000 Gauss (Gs), and the remanence can also be as high as more than 100 Henry (or Gauss), which provides a strong magnetic driving force for micro motors.High energy density: sintered NdFeB magnets have a high magnetic energy product, which makes the magnetic energy stored in a unit volume large, which is conducive to reducing the size and weight of the motor.2. Excellent physical propertiesGood wear resistance: Due to the lattice structure characteristics of sintered NdFeB, it has good wear resistance and can maintain stable performance in long-term operation.High thermal conductivity: As a new energy-saving material, the thermal conductivity of sintered NdFeB is much higher than that of traditional materials such as nickel-chromium alloy, which helps the motor dissipate heat during efficient operation and prolong its service life.Strong radiation resistance: Within a certain temperature range (such as 300~400°C), sintered NdFeB has high radiation resistance and is suitable for micro-motor applications in some special environments.3. Advantages of miniaturization and lightweightLow volume density: Compared with other permanent magnet materials, sintered NdFeB has a lower volume density, which gives it greater flexibility in designing micro-motors and can achieve a more compact structure.Reduce motor weight: The high energy density makes the motor using sintered NdFeB magnets lighter while maintaining the same output power, which is particularly important for applications that require portability or mobility.4. Economic and environmental protectionCost-effectiveness: Although the unit price of sintered NdFeB magnets may be high, due to their high energy density and excellent magnetic properties, the use of magnets can be reduced in the overall motor design, thereby reducing the overall cost.Environmentally friendly materials: sintered NdFeB magnets are a rare earth permanent magnet material. Compared with traditional electromagnets and other materials, they have less impact on the environment during the production process and are recyclable, which is in line with the current environmental protection trend.5. Application examples and market demandWide application: sintered NdFeB magnets have been widely used in various types of micro motors, such as voice coil motors (VCMs) in hard disk drives (HDDs), optical read head drive motors in optical drives (DVDs), and mobile phone vibration motors.Market demand growth: With the development of science and technology, micro motors are increasingly used in smart devices, wearable devices, medical devices and other fields, and the demand for high-performance permanent magnet materials is also increasing. Sintered NdFeB magnets have broad market prospects in these fields due to their excellent performance.The application of sintered NdFeB magnets in micro motors is important because it provides high-performance magnetic properties, excellent physical properties, miniaturization and lightweight advantages, economic and environmental protection, and wide market demand. These factors have jointly promoted the widespread application and development of sintered NdFeB magnets in the field of micro motors.
