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Rotary Actuator
- 2. Definitions ▪ A rotary actuator is an actuator that produces a rotary motion or torque. ▪ An actuator that directs force in a circular motion. Rotary actuators are sometimes called motors. ▪ A rotary actuator is the most compact device available for producing torque from hydraulic or pneumatic pressure.
- 3. Actuator power sources ▪ Stepper motors a form of electric motor that has the ability to move in discrete steps of a fixed size. ▪ Servomotors a packaged combination of several components motor | gear train | position encoder ▪ Fluid power actuators drived as an actuator, internally constructed both hydraulic and pneumatic power. ▪ Vacuum actuators vacuum powered rotary actuators, without pneumatic power.
- 5. Applications General Industry camming indexing clamping braking tensioning positioning tilting safety closure systems Marine opening and closing hatches swinging cargo handing gear opening and closing fire and collision bulkhead doors valve operation positioning hydrofoils steering control Robotics rotation and positioning Materials Handling switching conveyors turning and positioning container clamps on lift trucks tensioning and guiding operating valves braking lifting Metals Processing upending coils turnstiles walking beams immersion/agitation mechanisms
- 6. Servomechanism as a Rotary Actuator Small R/C servo mechanism 1. electric motor 2. position feedback potentiometer 3. reduction gear 4. actuator arm
- 7. Rotary encoder A rotary encoder, also called a shaft encoder, is an electro-mechanical device that converts the angular position or motion of a shaft or axle to an analog or digital code.
Editor's Notes
- The simplest actuator is purely mechanical, where linear motion in one direction gives rise to rotation. The most common actuators though are electrically powered. Other actuators may be powered by pneumatic or hydraulic power, or may use energy stored internally through springs.
- Stepper motors are a form of electric motor that has the ability to move in discrete steps of a fixed size. A servomotor is a packaged combination of several components: a motor (usually electric, although fluid power motors may also be used), a gear train to reduce the many rotations of the motor to a higher torque rotation, a position encoder that identifies the position of the output shaft and an inbuilt control system. Both hydraulic and pneumatic power may be used to drive an actuator, usually the larger and more powerful types. As their internal construction is generally similar , they are often considered together as fluid poweractuators Where a supply of vacuum is available, but not pneumatic power, rotary actuators have even been made to work from vacuum power. The only common instance of these was for early automatic windscreen wipers on cars
- A rotary actuator consists of a short cylindrical chamber, enclosing a vein affixed to a central shaft and a shoe which partitions the chamber into compartments on either side of the vein. The chamber is born by a body boarder closed at each and buy ahead which supports the shop to some believe in an anti-friction bearing specially compounded seals help prevent leakage past issue in vain. A fluid pressure differential between the chamber compartment acts upon the vein to car shop rotation through in park . the majority a rotary actuators are constructed with one or two veins but they are available with three or more veins for special applications. the rotary actuator simple and efficient.
- Rotary actuators are used in a vast range of applications. These require actuators of all sizes, power and operating speed. These can range from zero power actuators that are only used as display devices, such as air core gauges. Others include valve actuators that operate pipeline and process valves in the petrochemical industry, through to actuators for large civil engineering projects such as sluice gates and dams.
- servo, is an automatic device that uses error-sensing negative feedback to correct the performance of a mechanism and is defined by its function. It usually includes an in-built encoder.
- A simple 3 pin-rotary encoder above, and wtih a hand drawn schematic short circuit with the theoretical output pulses on the right. R1 and R2 are the pull up resistors. Pin A will be first shorted to GrouND and then pin B in the Right wise . Same way, Pin B will be first shorted to GrounND and the pin A int he Left wise. Turning of the knob will causing a noise in wave, so decoupling capacitors are placed. There are two main types of rotary encoder as absolute and incremental, and this 3pin rotary encoder is an example of incremental encoder