Similarly the phase C is energized, and the phase B is disconnected, and the rotor moves again in 90 degrees to align itself with the axis of the phaseThus, as the Phases are excited in the order as A, B, C, D, A, the rotor moves 90 degrees at each transition step in the clockwise direction. The rotor moves 90 degrees in the clockwise direction to align with the resultant air gap field which lies along the axis of phase B. The rotor is stable in this position and cannot move until phase A is de-energized.Now, the phase B is excited and phase A is disconnected. The rotor aligns itself with the axis of phase A as the winding A is energized. The phase windings of the stator are energized in the sequence A, B, C, D, A. Here, (4/2 pole) means that the stator has four poles and the rotor has two poles.The four phases A, B, C and D are connected to the DC source with the help of a semiconductor, switches S A, S B, S C and S D respectively as shown in the above figure. Working of a Variable Reluctance Stepper MotorA four phase or (4/2 pole), single stack variable reluctance stepper motor is shown below.
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