At present, the quality of the user requirements for electric tools is more and more high, especially pay much attention to the product efficiency, weight, life index. For example, in the construction industry, the quality problem of domestic electric tools exposed mainly include: Drill Bits for Hammer easily fever, continuous working time is short, small impact force, vibration hammer, the operator should be forced to drill deep; easy to wear, easy to break.
Power in China electric tool manufacturing technology level and there is still a large gap, mainly products monotonous appearance, quality is not stable, high-frequency screams, unit weight, low output, does not meet the requirements of electromagnetic compatibility. For example, the output in unit weight, the current domestic and foreign famous brand electric drill low 30 to 50 watts / kilogram; impact drill is lower about 30 to 80 W / kg.
At the same time, the domestic electric tools, most of the products do not meet environmental requirements. In accordance with the provisions, electric tools shall be in accordance with the new standard of radio interference (known as EMC) requirements. To improve the technical level of the EMC, we must use new materials, new technology to reduce noise, such as the use of rare earth permanent magnetic material.
Electric tool can not only improve the efficiency, but also can reduce the noise, no radio interference, but also improved product properties.
At present, our country is still in the development stage in permanent magnet electric tool. In addition, the domestic electric tools electric drill, electric hammer, impact drill, a few varieties of electronic speed control function, mostly single speed products, can not meet the requirements of users.