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The history of electric tool-----------CHUANBEN POWER TOOL CO.LED [2014-09-04]

            Do you kown when did the first electric tool be made?Do you understand the development history of electric tool?so, let me tell you.In 1895, Germany overtone to create the world's first direct current drill.The shell made from cast iron, can be in 4 mm steel plate with a hole.Then the three-phase power frequency (50 hz) drill, but the motor speed can't exceed 3000 r/min.In 1914, a single-phase series motor driven power tools, motor speeds above 10000 r/min.In 1927, the power supply frequency is 150 ~ 200 hz frequency electric tool, it not only has the advantage of high single-phase series motor rotation speed, but also has the advantages of simple structure, reliable three-phase power frequency motor, but because of the need medium frequency power supply, current use is restricted.
              In the '60 s, with the development of battery technology, appeared with nickel cadmium battery power battery electric tools without the power cord.But at that time, because of the expensive, development is slow.To the mid and late 70 s, due to price battery, charging time is shortened, the electric tool widely used in Europe and the United States, Japan.After electric tool was originally cast iron shell, use aluminum alloy shell.In the '60 s, thermoplastic engineering plastics used in electric tools, and double insulation and implements the electric tools, guarantee the safety of the use of electric tools.Due to the development of electronic technology, electronic speed electric tools emerged in the 60 s.This kind of electric tools using thyristor components of electronic circuits, such as to switch the depth of the snap button is pressed into the different to adjust speed, so that the power tool when use object can be processed according to the different (such as the material is different, the hole diameter size, etc.), choose a different speed.
          Electric tools with the wide use of people, but also developed more and more kinds, is more and more convenient people's life.

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