A Design of Automatic Speed Adjustable System for Five-Phase Hybrid Step Motor Driver

Hybrid step motor is one of the primary candidates for direct drive motor due to its high torque and low speed, but the vibration it produces is a major drawback to use it in applications. Micro-step is one method to reduce the vibration and to obtain high resolution motor steps, which divides a single step into many micro-steps. However, the efficiency of micro-step for reducing vibration is proportional to the number of division for each single full-step. It means the vibration exists while using small divisions in micro-step. This paper presents the development of automatic speed adjustable FPGA based driver for controlling five-phase hybrid step motor. The application circuit we developed is aimed for use in a low cost system. Simulations were done, and circuit analysis tests were carried out to verify our design, using prototype circuit boards. Low vibration and high resolution steps are achieved by using our adjustable micro-step control method.