The sophisticated driver, the DM542, can drive a stepper motor with a waveform called a âmicrosteppingâ waveform and such a waveform closely matches an AC synchronous waveform and as such the stepper motor can be considered an AC synchronous motor. This AC current, in its basic form, consist of rectangular waveforms that represent the fundamental frequency of the AC waveform. Interestingly, the stepper motor can also be considered as belonging to the family of electric motors called alternating current, AC synchronous motors because the stepper motor drivers convert DC electric current into AC current. 4.2, or the more sophisticated DM542 Fully Digital Stepper Drive, Fig. Such motors rely on a DC power supply that supplies current to a sequenced switched current power driver such as the Keyes L298 driver, Fig. Stepper motors fall into the family of electric motors called brushless direct current, DC, electric motors, also known as BLDC electric motors. However, we will only be concerned with the hybrid type here. There are two more types of stepper motor: one is called a âvariable reluctanceâ stepper motor that works only with a soft iron rotor and stator and is without any permanent magnet and the other is called a permanent magnet stepper motor that works with a permanent magnet rotor and a soft iron stator but does not have a soft iron rotor. 4.1, is a hybrid-type stepper motor that works with a permanent magnet and soft iron rotor and stator. The stepper motor, Long's Model 57BYGH7630, Fig. Theory III: The Stepper Motor and Its Controlįrancis Nickols, Yueh-Jaw Lin, in Creating Precision Robots, 2019 4.1 Introduction to the Stepper Motor and Its Power Drivers

Waveform of stepper motor drive