App note: Linear speed control of stepper motor

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An app note (PDF!) from Atmel on Linear speed control of stepper motor:

This application note describes how to implement an exact linear speed controller for stepper motors. The stepper motor is an electromagnetic device that converts digital pulses into mechanical shaft rotation. Many advantages are achieved using
this kind of motors, such as higher simplicity, since no brushes or contacts are present, low cost, high reliability, high torque at low speeds, and high accuracy of motion. Many systems with stepper motors need to control the acceleration/deceleration when changing the speed. This application note presents a driver with a demo application, capable of controlling acceleration as well as position and speed.

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