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The working principle of electric drill [2013-12-17]

The drill is the rotor electromagnetic rotary or electromagnetic reciprocating small capacity motor makes the magnetic field cutting work operation, operation device driven by the transmission mechanism, drives the gear to increase bit power, so that the drill bit scraping surface, penetrate the objects better.

The birth of the world electric tool drill products -- from the beginning of 1895, the German Fein company developed the world's first DC electric drill, the drill is the weight of 14 kg, the shell is made of cast iron, drill 4 mm hole in the plate only. There were three phase power frequency (50Hz) electric motor speed, but failed to break through 3000r/min.

In 1914, the single-phase series motor driven electric drill, motor speed is above 10000r/min.
In 1927, the power supply frequency is 150 - 200Hz intermediate frequency electric drill, it not only has the advantages of high speed of single-phase series motor, and has the advantages of simple structure of three-phase power motor, reliable, but because the required if current power supply, the use is restricted.

60 years, there has been no power line battery electric drill with nickel cadmium battery as power supply. To reduce in the late 70's, because of price of batteries, charging time is shortened, the electric drill used widely in Europe and the United States, japan.
Drill initially with cast iron shell, after the switch to aluminum alloy shell. In 60, thermoplastic engineering plastics used in the electric drill, and realize the double insulated electric drill.

60 time also appeared in the electronic speed electric drill. This drill thyristor and other components of electronic circuits using, to regulate the speed to switch button is pressed into different depth, thereby the drill can be processed according to different objects (such as in the use of different materials, hole diameter), choose a different speed.
To make a very large contribution to the invention and application of electric drill for the development of the world civilization!

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