Stepper motors convert digital information into proportional mechanical movement. The stepper motor can also hold their position and resist rotation. The rotor moves by applying power to different coils in a predetermined sequence. The difference between stepper and DC motors is the way the shaft moves. Stepper motors are formed by coils and magnets and incorporate a shaft that moves when power is applied. Stepper motors may be used for locomotion, movement, positioning, and many other functions where we need precise control of the position of a shaft, lever or other moving part of a mechatronic device. The shaft or spindle of a stepper motor rotates in discrete step increments when electrical command pulses are applied to it in the proper sequence, and the motor's position can be controlled precisely without any feedback mechanism (an open-loop controller), as long as the motor is carefully sized to the application. A stepper motor (or step motor) is a brushless DC electric motor that can divide a full rotation into a large number of steps.
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