Electric tool made by Garden Tool Ac Motor
In 1895, German overtones produced the world's first DC electric drill. The outer casing is made of cast iron and can be drilled with 4mm holes in the steel plate. Then there was a three-phase power frequency (50Hz) electric drill, but the Garden Tool Ac Motor speed did not exceed 3000r/min. In 1914, a single-phase series-excited motor-driven power tool appeared, with a motor speed of more than 10,000 r/min. In 1927, there appeared an intermediate frequency power tool with a power supply frequency of 150~200Hz. It has the advantages of high speed of single-phase series-excited motor and simple and reliable three-phase power frequency motor, but it needs to be powered by medium frequency current. , use is limited.
In the 1960s, with the development of battery manufacturing technology, there was a battery-type power tool without a power cord using a nickel-cadmium battery as a power source. But at that time, due to the high price, the development was slow. In the mid-to-late 70s, due to lower battery prices and shorter charging times, this power tool was widely used in Europe, America and Japan. The power tool was originally made of cast iron as the outer casing, and then changed to aluminum alloy as the outer casing. In the 1960s, thermoplastic engineering plastics were used in power tools and double insulation of power tools to ensure the safety of power tools. Due to the development of electronic technology, electronic speed control power tools also appeared in the 1960s. The power tool uses an element such as a thyristor to form an electronic circuit, and the rotation speed is adjusted by the depth at which the switch knob is inserted, so that the power tool can be used according to the object to be processed (such as different materials, diameter of the drilled hole, etc.). ), choose a different speed.
According to the "China Power Tools Industry Production and Demand Forecast and Transformation and Upgrade Analysis Report", power tools are mainly divided into metal cutting power tools, grinding power tools, assembly power tools and railway power tools. Common power tools for various types of power tools include electric drills, electric grinders, electric wrenches and electric screwdrivers, electric hammers and impact drills, concrete vibrators, and electric planers.
Garden Tool Ac Motor have important low positions in the future development.
