Humanoid Robot - Actuators


Actuators are the motors responsible for motion in the robot.

Humanoid robots are constructed in such a way that they mimic the human body, so they use actuators that perform like muscles and joints, though with a different structure. To achieve the same effect as human motion, humanoid robots use mainly rotary actuators. They can be either electric, pneumatic, hydraulic, piezoelectric or ultrasonic.

Hydraulic and electric actuators have a very rigid behavior and can only be made to act in a compliant manner through the use of relatively complex feedback control strategies . While electric coreless motor actuators are better suited for high speed and low load applications, hydraulic ones operate well at low speed and high load applications.

Piezoelectric actuators generate a small movement with a high force capability when voltage is applied. They can be used for ultra-precise positioning and for generating and handling high forces or pressures in static or dynamic situations.

Ultrasonic actuators are designed to produce movements in a micrometer order at ultrasonic frequencies (over 20 kHz). They are useful for controlling vibration, positioning applications and quick switching.

Pneumatic actuators operate on the basis of gas compressibility. As they are inflated, they expand along the axis, and as they deflate, they contract. If one end is fixed, the other will move in a linear trajectory. These actuators are intended for low speed and low/medium load applications. Between pneumatic actuators there are: cylinders, bellows, pneumatic engines, pneumatic stepper motors and pneumatic artificial muscles.

Read more about this topic:  Humanoid Robot

Other articles related to "actuator, actuators":

High-redundancy Actuation - Technical Realisation - Available Technology
... of high-redundancy actuation is technology agnostic it should be applicable to a wide range of actuator technology, including different kinds of linear ... However, initial experiments are performed with electric actuators, especially with electromechanical and electromagnetic technology ... Compared to pneumatic actuators, the electrical drive allow a much finer control of position and force ...
Attitude Control System
... vehicle attitude requires sensors to measure vehicle attitude, actuators to apply the torques needed to re-orient the vehicle to a desired attitude, and algorithms to command the actuators based on (1) sensor ... The integrated field that studies the combination of sensors, actuators and algorithms is called "Guidance, Navigation and Control" (GNC) ...
Battlefield Extraction-Assist Robot - Features and Technology - Actuators
... The BEAR is powered through a hydraulic actuator which gives the robot the ability to lift 520 pounds ... The hydraulic actuator is controlled by solenoids that turn the hydraulic valves on and off to make the robot move ...
Electroactive Polymers - Applications of EAP
... into microelectromechanical systems (MEMS) to produce smart actuators ... This concept is based on using an EAP actuator configured in an array form ... The most likely configuration for a pump based on actuators would be a dual diaphragm device ...