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PM stepper Motor, also known as permanent magnet stepper motor. The rotor is made of permanent magnet steel. The stator of the PM stepping motor is stamped into claw-shaped tooth poles, and the rotor is made of permanent magnets with radial multi-pole magnetization. This kind of motor has low cost.
The principle of PM stepping motor: the magnetic field generated by the coil current direction and the rotor magnetic field repel each other, so that the motor is reversing.
PM stepper motors are divided into 2 phases and 4 phases, with small torque and volume. The step angle is as follows: 5.625°/7.5°/11.25°/15°. There are two parts in a motor: the rotor and the stator: usually, the stator is a coil and the rotor is a permanent magnet; it can also be that the stator is a permanent magnet and the rotor is a coil.
The stator and rotor of the PM stepper motor are equally divided into two parts in the axial direction. The middle is separated by a magnetic gasket, and the two parts are separated by a step angle. Each is composed of a stator and a rotor to form a toroidal winding. Set on the stator. The pole shoes on the circumference of the inner hole of each stator are symmetrically arranged in a claw shape, and two sets of anti-series toroidal windings are wound on the outside. The two ring magnets of the stator are coaxially connected and radially magnetized in the same direction.
Here is a detailed introduction to the working principle of the PM stepper motor.
Assume that the upper two reverse windings are A phase and A phase, and the lower two reverse windings are B phase and B phase respectively. When the AO and BO two-phase windings are energized, the polarities of the inner-phase lead pieces of the same part are opposite. The rotor is in an equilibrium position at the stator pole shoes. When phase A and phase B are energized into phase AO and phase BO, the polarities of the B stator pole pieces are all opposite. The rotor will move one step to the left. If you continue to change the energized state, the rotor will gradually rotate from AB→AB→AB→AB. If the power-on sequence is changed from AB→AB→AB→AB, the motor will rotate in the reverse direction.
Application areas of PM stepper motors: computer peripherals, photographic systems, view point combination equipment, valve control, CNC machine tools, automatic winding machines, medical equipment, electronic clocks, automatic embroidery machines, office automation, household appliances industry.