A permanent magnet stepping motor (PM) is a motor in which the magnetic rotor core rotates by interacting with a pulsed electromagnetic field generated by the stator. PM stepper motors are generally two-phase, with smaller torque and size, and a stepping angle of generally 7.5 degrees or 15 degrees. There are two parts in the motor, the rotor and the stator: either the stator is the coil and the rotor is the permanent magnet, or the stator is the permanent magnet and the rotor is the coil.
Application areas: permanent magnet stepper motors are mainly used in computer peripherals, photographic systems, optoelectronic combinations, valve control, nuclear reactors, bank terminals, CNC machine tools, automatic winding machines, electronic clocks and medical equipment.
42l is the size of the motor, followed by the different subcategories of this model, what is the difference lz find out for yourself!!!!