Abstract
A small sized servo actuator with high output torque at low rotation speed has been developed for applications to servo driving of micro-machine such as micro-robots. It consists of a Brushless motor and planetary gear drive. In this report, each element technology, output characteristics of the actuators are described. The planetary reduction gear drive has six micro-gear and planet carrier with 3K-type mechanical paradox. A prototype actuator is 13.5mm in diameter and 40mm in length, the planetary reduction gear drive is high reduction ratio of 1/243.
