Stepper Motor

How does a Stepper Motor Rotate?

Figure 1 shows a simplified schematic of the operation for a two-phase permanent magnet stepper motor and Figure 2 the corresponding energizing sequence of the coils (clockwise rotation). For a counterclockwise rotation, the sequence must be reversed. As one coil is energized, a magnetic field is created and attracts the North or South pole of …

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Difference between Unipolar and Bipolar Stepper Motor

Bipolar motors have a single winding per phase. The current in the winding needs to be reversed in order to reverse a magnetic pole. Therefore, the driving circuit is more complicated and typically utilizes an H-bridge arrangement. Because windings are better utilized, they are more powerful than a unipolar motor of the same size. A …

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Types of Stepper Motors

There are a wide variety of stepper motor types, some of which require very specialized drivers. For this purposes, we will focus on stepper motors that can be driven with commonly available drivers. There are three types of stepper motors: Permanent magnet stepper motor Magnetic rotor Variable reluctance stepper motor Non-magnetic, geared rotor Hybrid stepper …

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