Introduction: In 1914, electric tools driven by single-phase series excited motors appeared, with motor speeds exceeding 10000r/min. In 1927, a medium frequency electric tool with a power supply frequency of 150-200Hz appeared. It has the advantages of high speed of single-phase series excited motors and simple and reliable structure of three-phase power frequency motors. However, its use is limited due to the need for medium frequency current power supply.


Application scope: hair dryer, electric toothbrush, drone, vacuum cleaner, sweeper, etc


Application case:

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Application circuit:

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