![]() ![]() Not easy to operate at extremely high speeds.Due to the presents of the permanent magnet, the rotor has greater inertia.Construction is complex compared to other stepper motors.The shaft is held at a position even after the supply is disconnected. ![]() The excitation required to achieve given torque is less compared to other stepper motors.Small rotor steps can be achieved (angles up to 1.8°).The poles to be energized will depend upon the direction of rotation to be done by the rotor. Suppose, if phase B is excited the rotor will make a step by one-quarter of a tooth pitch. This makes rotor pole N align with stator pole S (i.e., 3 and 7) and rotor pole S with stator pole N (i.e., 1 and 5). When phase A is excited, the poles 1 and 5 are energized with the pole N and the poles 3 and 7 with the pole S. When the current in a phase is reversed, the axis of the poles gets changed from the north pole to the south pole or vice-versa. Poles 1, 3, 5, and 7 forms phase A and poles 2, 4, 6, and 8 form phase B.Įach phase is wound so that the poles 180° apart are with the same polarity, while the poles 90° apart are with opposite polarity. The winding coils are placed at 90° from one another, making up each phase. The stator has a two-phase construction (Phase-A and Phase-B).
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