A brief introduction to PM stepper motors
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.
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