Stepper motor
Electric motor for discrete partial rotations / From Wikipedia, the free encyclopedia
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A stepper motor, also known as step motor or stepping motor,[1] is an electrical motor that rotates in a series of small angular steps, instead of continuously.[2] Stepper motors are a type of digital actuator. Like other electromagnetic actuators, they convert electric energy into mechanical 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.
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Switched reluctance motors are very large stepping motors with a reduced pole count, and generally are closed-loop commutated.