Which motor type rotates a predefined angle with each electrical impulse?

A stepper motor is designed to turn a specific angle with each electrical impulse, making it ideal for applications requiring precise positioning and control. This precision arises from its construction, where the motor is divided into distinct steps or increments. Each electrical pulse sent to the motor corresponds to a specific movement about its shaft, allowing for accurate rotation in predetermined increments.

This feature is particularly useful in various automation and robotics applications, where controlling the exact position of a component is crucial. For example, in 3D printers and CNC machines, stepper motors provide the ability to move in fine, controlled steps, enabling detailed and intricate movements that are essential for producing high-quality products.

In contrast, servo motors are more focused on providing high speed and torque while maintaining accurate position through feedback systems, rather than rotating in fixed steps. AC motors typically rotate continuously when in operation and are not inherently designed for stepwise control. Variable speed motors offer adjustable speeds but lack the precise angular control that a stepper motor provides. Therefore, the defining characteristic of a stepper motor is its ability to rotate by a predefined angle with each electrical impulse.