Three-phase ac asynchronous motor load start and start up with airload start current who small, why?
Motor in no-load and load conditions, start the moment for the operation condition of the motor are the same, the rotor is in stop state, starting current at this time also is same, after the rotor rotation, only the difference between no-load and load startup, reflect on the starting current, is the continuous length of time. There is a difference between direct current and ac motor. For ac asynchronous motor, the no-load and load the biggest starting current is the same, different is only the duration of the starting current and the current normal. No load and load startup, the rotor and the stator rotating magnetic field of the slip is the same, the current will be the same. Light speed is fast, short. The load speed is slow, with the length.
Starting the current size doesn't have anything to do with the belt without load, so the boot current is the same size. You can see the equivalent circuit of the motor.
Load start current is large, and load start consists of idle start current and load current.
