Advantages and disadvantages of stepper motors Open Loop Stepping Motor Driver kit

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Advantages and disadvantages of stepper motors Open Loop Stepping Motor Driver kit

The reason for using a stepper motor is to achieve precise control: you can make it move through a defined angle. But there are drawbacks too. Stepper motors can sometimes be quite jerky, because they start and stop each step with a sudden impulse, which isn't always what you want if you're trying to build a precision machine. An alternative to using a stepper motor is to use a servo motor: a motor with a built-in feedback mechanism. Typically, a servo motor has what's called an optical encoder attached to its rotor. In plain English, that's a black-and-white patterned disc that moves in front of something like a photoelectric cell. As the disc turns, the cell detects the black and white pattern and an electronic circuit figures out from this exactly how much the disc has rotated. Using this feedback, the motor can be controlled more smoothly (and typically much more precisely) than a simple stepper motor. Servo motors are much more sophisticated in design than stepper motors and tend to be more expensive, which is why steppers are often used instead.

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