MACHINE TOOL ENERGY-SAVING POWER MONITORING DEVICE

The utility model discloses a machine tool energy-saving power monitoring device. A stator current is used as a detection signal. The current is divided into two working paths after detected by a current transformer. One path is sent to a comparing element for controlling a main circuit. Once a machine tool is in light load state or no load state, the voltage of power supply can be lowered through an autotransformer. Thus, a motor can work with the low voltage. Once the load machine tool is greater than state a certain control value, the electric motor works with the full voltage. The other path of the current is divided into two channels through the amplifying element. One channel is sent to a current display element which can indirectly display the power of the machine tool. The other channel is sent to a power protection circuit. Once the power exceeds a setting power, the circuit of the main power supply can be cut off.