Stepper motors resemble servo motors in that both types are characterized by an ability to rotate a partial turn and then stop for any interval with or without holding torque. In addition, both motor types are externally commutated. However, the difference is the stepper motor operates in an open loop control system while the servo motor works in a closed loop system. Stepper motor basics Also correctly called the step or stepping motor, this type of motor is similar to a brushless DC ...
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