ELECTRIC TOOLS DISCONNECTION FROM ELECTRIC MAINS BY MEANS OF SWITCHES Russian patent published in 2016 - IPC H02H7/08 H03K17/82 H02P25/14 

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and can be used in an electric motor for power tools supplied from electric mains. In each main-operated lead (a, b) of the electric motor there is a switch (1, 3). The switches (1, 3) are connected to electronic control unit (4) by control lines (20, 21). The electronic control unit (4) at the respective control stage actuates one of switches (1, 3) into conductive state closing the other switch and registers operating parameter of the electric motor (2) comparing it to the preset value. When the operating parameter deviates from the preset value the electronic control unit (4) detects fault of switches (1, 3).

EFFECT: technical result consists in provision of two-way disconnection of power tools supplied from the mains and in control of operational reliability for switches.

11 cl, 4 dwg