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Actuators.ppt

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Actuators.ppt

  1. 1. Actuators are devices used to produce action or motion. Input(mainly electrical signal , air, fluids) Electrical signal can be low power or high power. Actuators output can be position or rate i. e. linear displacement or velocity. Actuation can be from few microns to few meters
  2. 2. A Power amplification & modulation Energy conversion Control signal Actuator Output Unmodulate Energy source
  3. 3. Linear actuator: solenoid, Hydraulic/Pneumatic. Rotary actuator: motor, Hydraulic/Pneumatic.
  4. 4. A solenoid is a coil wound into a tightly packed helix. In physics, the term solenoid refers to a long, thin loop of wire, and wrapped around a metallic core. which produces a magnetic field when an electric current is passed through it.
  5. 5. Pneumatic valve. Car door openers. Hydraulic cylinder Single pressure line
  6. 6. Hydraulic systems are used to control & transmit power. A pump driven by prime mover (electric motor) creates flow of fluid Linear actuator (hydraulic cylinder)- Provides motion in straight line. Linear displacement depends on stroke length. Usually referred to as cylinders, rams (single acting cylinders) or jacks. Rotary actuators (Hydraulic motors)- Produces continuous rotational motion. Pump shaft is rotated to generate flow. A motor shaft is caused to rotate by fluid being forced into the driving chambers.
  7. 7. Semi rotary actuators- Produces non-continuous rotational motion. Limited to less than one revolution (<360°). Used to produce oscillatory motions in mechanisms. Hydraulic jack. Hydraulic brake. Hydraulic ram. Used as sensor. Close loop velocity controlling. Highly precise positioning for heavy loads.
  8. 8. It convert energy formed by compressed air at high pressure into ether linear or rotary motion. Quickly respond in operation. Pneumatic actuatorPneumatic actuator
  9. 9. 10 Hydraulic & pneumatic actuators: cylindersHydraulic & pneumatic actuators: cylinders Single acting: work can be done only in one direction Piston Double acting piston: Piston rod on both sides Plunger Work is done in both directions Telescopic Telescopic Tandem
  10. 10. Non cushioned cylinders are suitable for full stroke working at slow speed. Higher speeds with external cushions.
  11. 11. 12 Rotary hydraulic actuatorsRotary hydraulic actuators Vane rotary actuator:  Limited angle in both directions.  Maximum angle always smaller than 360°  The same torque in both directions. Piston rotary actuator:  With rack and gear coupling.  Here maximum angle may be larger than 360° Limited angle rotary actuator Limited angle rotary actuator Parallel piston rotary actuator
  12. 12. Mechanical linear actuators typically operate by conversion of rotary motion into linear motion. Screw Wheel and axle Cam
  13. 13. Electrically actuated system are very widely used in control system There are three types of motor used in control system D.C. motor A.C. motor Stepper motor Every motor works on the principle that when a current-carrying conductor is placed in a magnetic field, it experiences a mechanical force. Working Principle of motor
  14. 14. A.C. motor Stepper motor Permanent magnet type Variable reluctance type Hybrid type A stepper motor is an electromechanical device which converts electrical pulses into discrete mechanical movements.
  15. 15. Pierre and Jacques Curie discovered the piezoelectric effect in 1880. The application of an electric field to a piezoelectric crystal leads to a physical deformation of the crystal. Piezoelectric materials are: Quartz, Ceramics, PZT(lead zirconate titanade). Advantages short response time. An ability to create high forces. A high efficiency and a high mechanical durability. Disadvantage Have small strains. (0.1-.2%) High supply voltage needed.(60-1000V) Large hysteresis.(actuator doesn’t go back to exactly where it started).
  16. 16.  A piezo ceramic crystal is coated with silver on both sides.  Glued to a brass, nickel alloy, or stainless steel disk. Brass: Commercial & industrial use.(not subjected to environment ) Nickel alloy: Use where it subjected to environment. Stainless steel: Uses where it subjected to solvent, corrosive chemical, Underwater . Medical fields.
  17. 17. Piezoelectric Stack Actuators Produce linear motion.
  18. 18. Heaters - used with temperature sensors And temperature controller to control the temperature in automated moulding Equipment and in soldering operation. Lights - Lights are used on almost all machines to indicate the machine state and provide feedback to the operator. LED LCD’s Gas plasma display CRT Sirens/Horns - Sirens or horns can be useful for unattended or dangerous machines to make conditions well known.

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