With the shortage of resources, countries are looking for energy-efficient way to tap the energy-saving potential of the motor, saving way to find effective is an effective way. There are a variety of motor energy saving methods, such as improving the efficiency of the motor, improve the power factor of the motor speed control and energy saving, VVVF control. Now to discuss the motor power factor energy saving.

     Asynchronous motor power factor varies with the load, rated load power factor, low power factor at light loads, generally in the range of 0.2 to 0.85. Asynchronous motor during operation in the power grid to draw a lot of emotional reactive power, the deterioration of the grid power factor, system efficiency decline. Reactive power compensation can be taken to be adjusted. Induction motor reactive power compensation, compensation under the premise of ensuring the proper working of the motor to improve the power factor of the electricity lines, while reducing the loss of power lines and transformers.

     Reactive power compensation methods are: (1) parallel capacitor. Usually in the outlet side of the motor and junction capacitors. Capacitance compensation, the line current lags the voltage electrical angle, compensate the line current lags the voltage angle relative reduction. Thus improving the power factor of the line. (2) Installation complement static power factor, the apparatus can be stepless adjusted continuously the inductive reactive device, can be the slow run mainly by the the AC filter device and capacity. Grid power factor improvement, under the premise of the active power constant is guaranteed, so that the view of the system in the current decreases, reducing the loss of the power supply system in order to effectively achieve energy.