Types, Strengths, And Weaknesses Of The Thermal Actuator System
The thermal actuator system is an actuator control system that aims to strengthen the control signal from the controller so that it becomes a new signal with power that is adjusted to the needs. Actuators function to control mechanical equipment or systems that are activated by mechanical arms. This can be in the form of an electric motor with an automatic controller that has been programmed in the microcontroller. Actuators change electromagnetic devices to produce kinetic energy. Increased mechanical power in the actuator can be installed in the transmission system.
Actors can carry out several types of movement operations when receiving commands made from the controller. An increase in mechanical power in this actuator can be done by installing a gearbox system. Actuators have several advantages, namely, there are hydraulic fluids that function as lubricants or coolants. Actuators can also produce large enough torque with low leakage rates. The design in the actuator is also very flexible. Also, the actuator has a fairly high reaction speed.
Types Of Actuators
Thermal actuator systems have various types with different components. Some types of actuators are as follows:
- Pneumatic Piston Actuators
Pneumatic piston actuators convert the energy produced by compressed air into mechanical motion when air is applied the motion will adapt to its type, which is linear or rotating. There is a piston that produces motive force from the air so that it keeps the air in a high position to be able to force the diaphragm to turn the valve stem. The advantage of pneumatic piston actuators, the first is its simple but high capacity construction and low torque. The next advantage is that it can be operated at high temperatures with very fast beats. This type of actuator also has several drawbacks, namely requiring additional springs and accessories for the system in the event of component damage during engine operation. The next drawback is the positioners which incur high costs because the process requires slowing.
- Electro-Hydraulic Actuators
The actuator principle uses Pascal’s law which implies an increase in pressure on certain portions of the fluid restriction. The increase in certain parts will also cause the same increase in pressure in a container. This explains the whole system of work when Pascal’s law was applied. The advantage of this electro-hydraulic actuator is that it has high rigidity. Furthermore, the deceleration is good. Meanwhile, the loss of this actuator is quite complicated maintenance and requires additional accessories for system safety.
- Electric Motor Actuators
An actuator that uses an electric motor to get mechanical torque. The energy source is electricity for the transfer operation. The advantage of an electric motor actuator is that it has a dense design with very high rigidity, so it does not require the installation of pipes for pressure supply. The disadvantage of electric motor actuators is that they are quite expensive and do not have a security system when the component is damaged. The other drawback is having a limited stroke speed.
- Diaphragm And Spring Actuators
The actuator can also act as a direct-acting to push the actuator rod to the lower area with air contained in the diaphragm container. The result of this process is air compression which occurs when the pressure supply is reduced so that it can push the driveshaft back. The advantage of this actuator is its cost is quite low. Also, even in the absence of a positioner can still do the slowing process. Meanwhile, the weakness of diaphragm and spring actuators is having a large size with a fairly heavyweight.
Thermal actuators are a type of non-electric motor made of pistons and thermal sensitive materials that are capable of producing linear motion. The form of the movement is a response to changes in temperature. Thermal actuators do not require external resources to move. Temperature changes in the thermal actuator system can be used to perform predetermined tasks. Examples of these tasks include; release the latch, operate the switch, and can also be applied to open or close the valve. This actuator device is very sensitive and can be used for applications that require very small changes in temperature. This thermal actuator system can be used for aerospace, automotive, agriculture, solar power, and various other applications.