The motor's position can be commanded to move and hold at one of these steps without any position sensor for feedback (an open-loop controller), as long as the motor is correctly sized to the application in respect to torque and speed. When the top electromagnet (1) is again enabled, the rotor will have rotated by one tooth position since there are 25 teeth, it will take 100 steps to make a full rotation in this example.Ī stepper motor, also known as step motor or stepping motor, is a brushless DC electric motor that divides a full rotation into a number of equal steps. This results in a rotation of 3.6° in this example.įrame 3: The bottom electromagnet (3) is energized another 3.6° rotation occurs.įrame 4: The left electromagnet (4) is energized, rotating again by 3.6°. With the teeth aligned to electromagnet 1, they will be slightly offset from right electromagnet (2).įrame 2: The top electromagnet (1) is turned off, and the right electromagnet (2) is energized, pulling the teeth into alignment with it. Animation of a simplified stepper motor turned on, attracting the nearest teeth of the gear-shaped iron rotor.
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