Introduction - If you have any usage issues, please Google them yourself
Unlike the monopole stepper motor, the bipolar step motor has only one single winding per phase, without a tap. In order to reverse the magnetic pole, the current in the winding needs to be reversed, which means that the bipolar step motor drive is usually more complex and usually requires a H bridge arrangement. Since there is no public end, each phase has two leads, the typical two phase motor will have four lead. Although bipolar motors are usually driven more complex, they do have their advantages, because the better use of windings and bipolar motors is stronger than the same weight monopolar motors. This is because the unipolar stepper motor has two times of wire quantity in the same space, and it can only use half of it at any time, which means that the single pole motor is only about 50% efficiency.