The motor manufacturer reminds that, generally speaking, the no-load current of the motor can largely reflect the function of the motor.In each link of variable frequency motor production, testing, sales and utilization, the no-load current of the motor can be used as a qualitative criterion for determining the state of the motor.

　　Because there is a certain elusive connotation relationship between the rated voltage, rated current and no-load current data, once the value exceeds the general rule, the enterprise should be aware of whether the motor is obstructed.

　　When the output shaft of the three-phase asynchronous motor has no load or the torque is zero, it is no-load operation. At this time, the current in the three-phase winding of the stator is mainly the exciting current, usually called no-load current.

　　Based on the above concepts, the smaller the no-load current, the better, so that the power factor of the motor is improved, which has advantages for power supply to the grid.If the no-load current is large, because the wire load area of ​​the stator winding is inevitable, and the current allowed to pass is inevitable, then the active current allowed to flow through the wire can only be reduced, and the load that the motor can start will be reduced. Small, the motor focus is low, and when the load is too large, the winding is prone to fever.

　　Generally, the no-load current of an ordinary motor is about 30% to 70% of the rated current, and the no-load current of a large and medium-sized motor is about 20% to 40% of the rated current.