Comparison of stepper motor with DC servo motor : sr . No. Stepper motors DC servo motor 1. Control winding is not present. Control wingding is present 2. Stepping rate is governed by frequency of switching and not by supply voltage. Does not rotate in steps. 3. Number of steps can be precisely controlled by controlling the number of pulses. DC servo motor gives continuous rotation. 4. Brushes are absent. Brushes are present 5. Maintenance is low High maintenance 6. Due to load/no load conditions no change in running current. Due to load/no load conditions sufficient change in running current. Comparison between AC and DC servo systems Comparison of stepper motor with DC servo motor