3. Actuators
Actuators for humanoid robots must meet the following criteria: a high power-to-mass ratio, the ability to produce high torques at low speeds, and a small footprint. This section describes the various technologies developed for humanoid robots.
Large humanoid robots such as HRP-2, Johnnie or HUBO-2 use actuators based on DC motors and speed reducers to transform speed into torque. Motors and reduction ratios can be sized using the method described in
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Actuators