Permanent magnet stepper motor sample
Working principle of permanent magnet stepper motor
What is a permanent magnet stepper motor
The permanent magnet stepper motor is composed of two phases in structure. It consists of two stator shrouds and claw poles around the coil, which forms the front of the motor and the rear has the same structure. The number of electrode pairs of the rotor is the same as that of the stator. The electrodes on the stator shroud are arranged at half the distance of the poles and have two coils, which means that each pole pitch can have four discrete positions. For example, a two-phase motor has 12 pairs of electrodes in each stator/coil segment, so it has 48 steps per revolution or 7.5 degrees per step.
Stepper motors are an electromechanical device that converts electronic pulses into discrete mechanical motions, so they can be operated directly from a pulse train or microprocessor. When an electronic command pulse is sent to the stepper motor in the appropriate sequence, its shaft will rotate in discrete step increments. The rotation of the motor has a number of direct relationships with these transmitted input pulses.
The sequence of transmitted pulses is directly related to the direction of rotation of the shaft of the motor. The speed of the motor shaft is directly related to the frequency of the input pulse, and the rotational distance is directly related to the number of input pulses transmitted. As long as the step accuracy is maintained, the error will not be accumulated.
The stepping angle of a permanent magnet stepper motor is generally 3.6 degrees to 18 degrees (or 100 steps per revolution to 20 steps per revolution).
