A brief history of electric tools

- Sep 12, 2017 -

1895, Germany made the world's first DC electric drill, Shell made of cast iron, can drill on the steel plate 4mm hole, then appeared three-phase power frequency (50HZ) electric drill, but the motor speed failed to break through 3000r/min.
In 1914, a single-phase series of motor driven electric tools, motor speed up to 10000r/min above.
1927, the power supply frequency is 150~200hz medium-frequency electric tool, it not only has the advantages of high rotational speed of single-phase series motor, but also has the advantages of simple structure and reliability of three-phase power-frequency motor, but the use of intermediate frequency current is limited.

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