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Industrial Circuits Application Note Stepper Motor Basics

1A Stepper Motor is an electromechanicaldevice which converts electrical pulses intodiscrete mechanical movements. The shaftor spindle of a Stepper Motor rotates indiscrete step increments when electricalcommand pulses are applied to it in theproper sequence. The motors rotation hasseveral direct relationships to these appliedinput pulses. The sequence of the appliedpulses is directly related to the direction ofmotor shafts rotation. The speed of themotor shafts rotation is directly related tothe frequency of the input pulses and thelength of rotation is directly related to thenumber of input pulses Motor Advantagesand DisadvantagesAdvantages1. The rotation angle of the Motor isproportional to the input The Motor has full torque at stand-still (if the windings are energized)3.

3 Figure 5. Magnetic flux path through a two-pole stepper motor with a lag between the rotor and stator. Figure 6. Unipolar and bipolar wound stepper motors.

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