In this paper, a case study for implementation of the micro-step driver optimized for resonance frequencies of the stepper motors is presented. First of all, the motor driver is implemented in Full- and Half-step modes. According to the irregular torque-to-rotation curve in these modes, several optimizations are applied to the driver achieving the micro-step driving circuit. Driver circuit is verified for each modes of motor motion. Considering obtained results, torque-reduction in resonance frequencies (appeared as holes in torque curve at these points) is eliminated with micro-step driving. By this optimization, and in the micro-step driving mode, motor consumes lower power than other modes.
Graduate Student, School of ECE, University of Tehran