Built-in magnets for power tools are high-performance miniature magnetic components specially used in the internal motors, switches, sensors and transmission structures of various electric tools, hand tools and pneumatic tools. Mainly made of high-grade sintered neodymium iron boron magnetic materials, these magnets have the characteristics of small volume, strong magnetic force, high temperature resistance and strong vibration resistance, and are widely used in electric drills, electric wrenches, electric hammers, angle grinders, cutting machines, screwdrivers and various rechargeable portable power tools. As the core magnetic source of power tool permanent magnet motors and induction systems, built-in magnets directly affect the power performance, operating efficiency, service life and use experience of power tools, and are key basic accessories in the power tool manufacturing industry.

In terms of core performance indicators, power tool built-in magnets mainly adopt N38SH, N40SH, N42SH high-temperature resistant series NdFeB materials, which can withstand the high temperature of 120℃-150℃ generated by long-term high-speed operation and frequent start and stop of power tool motors, without demagnetization and magnetic attenuation. The products have high remanence and high magnetic energy product, which can provide strong and stable magnetic field power for small-volume power tool motors, realize high power output of small motors, and meet the high-power operation requirements of power tools such as drilling, cutting and impact. At the same time, the magnets have excellent vibration resistance and impact resistance, can resist frequent mechanical vibration and impact during tool operation, and maintain stable magnetic performance without cracking and falling off.

In terms of processing technology and structural characteristics, power tool built-in magnets are mostly miniature sheet, block, tile-shaped and special-shaped magnetic steels with small size and high precision. The product adopts high-precision wire cutting and grinding processing technology, with smooth surface, accurate size and no burrs, which is suitable for the compact internal assembly space of power tools. The surface is treated with high-strength nickel plating or environmental friendly epoxy coating, which has good anti-corrosion, anti-wear and anti-oxidation performance, and can resist the erosion of metal dust, lubricating oil and industrial dust generated during tool operation, effectively protecting the magnetic core and prolonging the service life of the tool motor. All products undergo strict magnetic performance testing and high and low temperature aging testing to ensure stable and consistent performance of each batch of products and meet the mass production quality requirements of power tools.

The application scope of power tool built-in magnets covers almost all electric and rechargeable power tools. In motor power components, built-in magnets form a permanent magnet synchronous motor structure, replacing traditional brushed motors, realizing the upgrading of brushless power tools. The brushless motor equipped with NdFeB magnets has the advantages of high efficiency, low heat generation, long service life and low failure rate, which greatly improves the continuous working ability of power tools. In tool sensing and control components, small built-in magnets are matched with Hall sensors to realize intelligent speed regulation, torque control and over-current protection of power tools, realizing intelligent operation of tools, avoiding equipment damage caused by overload operation, and improving the safety and intelligence level of power tools. In partial tool locking and fixing structures, miniature magnets are used for auxiliary fixing of tool bits and accessories, realizing fast replacement and stable locking of tool accessories and improving operation efficiency.

Compared with traditional motor accessories, built-in magnets for power tools bring comprehensive performance upgrades to the power tool industry. First, the power efficiency is higher. The permanent magnet motor has no excitation loss, with higher motor conversion efficiency, more sufficient power output and more energy-saving operation. Second, the service life is longer. The brushless motor structure reduces vulnerable parts, and the magnetic performance is stable and durable, which increases the service life of power tools by more than 3 times. Third, the operation is more stable. The stable magnetic field ensures uniform motor speed and stable torque output, avoiding jitter and power insufficiency during tool operation. Fourth, the product is more lightweight. The small-size and high-magnetic-density magnets reduce the overall volume and weight of the tool motor, making portable power tools more flexible and labor-saving to use. With the rapid development of intelligent, lightweight and long-life power tools, built-in NdFeB magnets for power tools are constantly optimized in high temperature resistance, miniaturization and high efficiency, and have become the core driving force for the technical upgrading of the power tool industry.