Research on voltage-reduce energy saving strategy for three-phase induction motor

In electricity net, three-phase induction motor is the main load, actually, the running motors are mostly working under light-load or zero-load condition. The paper analyzes the changes of the loss and stator current of the motor during voltage-reduce and theoretically proves that stator current of motor is basically of the minimum value when the loss of motor is least, therefore, it is possible to achieve the purpose of energy saving by getting a minimum of stator current. The paper also verifies the ability of over load of motor when stator current is least. At the end, it is proved the validity of the proposed strategy by experiment.