Abstract
The gear ratio's influence on the performance of electromechanical servo systems is analyzed. Even though a gear primarily is used to reduce the actuator size and weight it is important to understand how the gear ratio affects the dynamics of the system. A good choice of gear ratio may improve the control performance while reducing the physical size of the system. It is concluded that for low gear ratios the plant bandwidth is increased with gear ratio. The torque margin of the motor is also shown to increase with gear ratio. Thus, from a control perspective, high gear ratios appear to be better than low.
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