The step motor allows the group to be electrically locked.
Three alternating current (ac) in a certain direction in turn give three coil electricity, the magnetic pole of the stator coil will rotate, so as to drive the rotor rotation, when ventilation with single phase dc, because only gives a coil electricity, magnetic pole is fixed, so the rotor has been fixed. The same phenomenon occurs when the asynchronous motor is connected to a single phase of direct current.
The rotor of the step motor has several different poles (N S), corresponding to the magnetic pole generated by the stator coils, and if it is a three-phase alternating current,
Not only sending back to keep the original bearing motor winding, only after the analog signal to the motor, the motor will rotate, rotating ring according to the signal number, to complete in an axial movement, pure to electricity, will lock the motor position, because the signal source is 4 ma.
