Missing step detection in a high speed micro stepping motor using current feedback

In this work, new approach of missing step detection without using costly encoder in a micro stepping motor is proposed. For a steeping motor driver, a MOSFET driven H-bridge driver was adopted, and sinusoidal type of current is controlled to implement the micro stepping. Also, in order to investigate the missing step the current flowing the coil which is generated from the operational amplifier was given feedback and the feedback data was analyzed to detect the missing step. As a sequence, the missing step was compensated as much as the amount of the missing steps, yielding the control of the desired micro stepping angle.