Abstract: In this paper, the principle of current feedback raising frequency raising voltage drive systems of 5 phase hybrid stepping motors is analyzed. Three kinds of operation modes of the systems, which are the ring connection and 4 5 excitation, the star connection and 4 5 excitation, and the star connection and 2 3 excitation, are analyzed and compared in detail by theories and experiments.

Key words: stepping motor, power dr ive, curr ent feedback, r aising frequency-r aising voltage