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Different types of Actuators | Basics of Actuator types

This article covers different types of Actuators and mentions functional basics of these Actuator types. It describes different types of Actuators viz. Hydraulic actuator, Pneumatic actuator, Electrical actuator, Mechanical actuator, Thermal or Magnetic actuator, Soft actuator etc.

What is Actuator?

Introduction:
• The component of a system (or machine) which moves or controls mechanism or the system is called actuator.
• An actuator requires control signal and source of energy.
• Upon receiving control signal, actuator responds by converting energy into mechanical motion.
• The control system can be simple (fixed mechanical or electric system), software based (e.g. a printer driver, robot control system), a human or any other input.

Actuator

Let us understand major functions or applications of different types of actuators.

Actuator Types | Types of Actuators with their functions

Let us understand different types of Actuators with their functions or applications.

Hydraulic actuator

• This actuator converts mechanical motion into linear, rotary or oscillatory motion.
• The hydraulic actuator consists of cylinder or fluid motor which uses hydraulic power to help mechanical operation.
• Liquids are nearly impossible to compress, hydraulic actuator maintains considerable force. Limited acceleration of actuator restricts its usage.
• Example: Hydraulic brake in vehicle

Pneumatic actuator

• This actuator converts energy formed by vacuum or compressed air at high pressure into linear or rotary motion.
• They are responsible to convert pressure into force.
• Advantages: 1. Pneumatic energy responds quickly to start and stop signals. 2. It does require power source to be stored in reserve for its operation. 3. Pneumatic actuators produce large forces from relatively small pressure changes.
• Examples:
➤Rack and Pinion actuators used for valve controls of pipes
➤Pneumatic brakes are very responsive to small pressure changes applied by the driver.

Electrical actuator

• It is powered by motor which converts electrical energy into mechanical torque.
• Electrical energy is used to actuate equipments (e.g. solenoid valves) which control water flow in pipes with response to electrical signals.
• Advantages: cheap, clean, speedy type of actuator.
• Examples: Solenoid based electric bell ringing mechanism

Mechanical actuator

• It converts rotary motion into linear motion.
• It consists of gears, pulleys, rails, chains and other devices for its operation.
• Examples: Rack and pinion mechanism and Crank shaft

Thermal or Magnetic actuator

• This actuator can be actuated by application of thermal or magnetic energy.
• This actuator uses shape memory materials e.g. shape memory alloys
• Advantages: Compact, light in weight, economical, offers high power density
• Examples: Thermal actuator is thermostat, magnetic actuator is electro magnet

Soft actuator

• It is polymer based and are designed to handle fragile objects like fruit harvesting in agriculture or manipulating the internal organs in biomedicine.
• Examples: Shape Memory polymers, Photo polymers
• Shape memory polymer is functions similar to our muscles. It also provides response to range of stimuli e.g. light, electrical, heat, magnetic, pH, moisture changes etc. The advantages of such polymers are low density, high strain recovery, bio-compatibility, bio-degradability etc.
• Photo polymers are known as light activated polymers. They are special type of shape memory polymers which are activated by light stimuli.

Other Actuator Types

Following are the other types of Actuators.
• Comb drive
• Electric motor
• Digital micromirror device
• Electroactive polymer
• Piezoelectric actuator
• Screw Jack
• Hydraulic Cylinder



Sensor basics and Different types of Sensors

Proximity Sensor   Occupancy Sensor vs Motion Sensor   LVDT and RVDT sensor   Position, displacement and level sensor   force sensor and strain sensor   temperature sensor   pressure sensor   Humidity sensor   MEMS sensor   Touch sensor   Haptic sensor   Wireless sensor



Advantages and Disadvantages of different types of sensors

Capacitive    Inductive    Photoelectric    Ultrasonic    Infrared    Motion    Biometric    Force    Humidity    Temperature    Light    Barometer    Sound    pH    Soil Moisture   

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