As we all know, Nema 24 stepper motor has a 60 x 60 mm faceplate, just slightly larger than the Nema 23 stepper motor. Why do we choose it? That’s because Nema 24 stepper motor is more powerful than Nema 23 stepper motor and it is also unnecessary to spend more money buying a higher torque stepper motor in practical application. So, the one that suits you is the best.
Unipolar stepper motors consist of a single winding with a center tap. Depending on the direction of the desired magnetic field, each part of the winding is switched on, because in this way the poles can be reversed without switching the direction of the current. Center taps are more common, and while on a 2 phase unipolar stepper motor there are usually 6 leads (3 per phase), the two commons can be connected together internally, which means there are only five leads.
Unlike unipolar stepper motors, bipolar stepper motors have only one single winding per phase and no taps. In order to reverse the magnetic poles, the current in the windings needs to be reversed, which means that bipolar stepper motor drives are generally more complex and often require an H-bridge arrangement. Since there is no common, there are two leads per phase, and a typical two-phase motor will have four leads. Although bipolar motors are generally more complex to drive, they do have their advantages. Because of better used windings, bipolar motors are more powerful than unipolar motors of the same weight. This is because a unipolar stepper motor has twice the amount of wires in the same space and can only use half of it at any one time, which means a unipolar motor is only about 50% efficient.