What is the function of an electric actuator?
An electric actuator is a device that uses an electric motor to generate the necessary force to move the load or perform an action, such as clamping.
How does an electric actuator work?
Rotation of the spindle or rotor of an electric motor will create rotary motion. Using a helical screw as a drive shaft, which rotates in a ball screw nut, the motor spindle is directly couple to the motor.
Along the helical screw, the ball screw nut is driven forward or backward as the spindle rotates.
As the motor rotates clockwise or anticlockwise, a hollow piston rod is attach to the ball screw nut, creating linear motion out of or into the linear actuator.
A motor is driven by an electric drive, which allows the rotation speed and, consequently, the linear speed to be varie. Feedback mechanisms provide positional information, and a linear actuator can program to move to a certain position, stop, then move on, or return to rest.
Motor power determines the torque that can generate and, therefore, the force that can apply by the actuator.
How do I select an electric actuator?
An actuator will be required for a force-requiring application. The force is created by pressure acting on the piston surface area of a pneumatic linear actuator. With electric actuators, the force is generated by the torque capability of the motor. In addition to the load to be moved, frictional forces on the surface and the angle of elevation of the load will all be critical parameters to consider.
Pneumatic actuators require a load to move a certain distance, which determines the stroke. There are some subtle differences between an electric actuator and a mechanical actuator. To prevent over-run, the ‘usable’ stroke is the maximum stroke less than four times the pitch of the helical screw. It is possible for an electric actuator to be used for a number of positions, so the stroke will need to take into account the total movement. In many applications, different screw pitches are available based on the bore, allowing component combinations to meet the needs of the application.
In addition, it is helpful to consider when an electric actuator is preferable to a pneumatic actuator. Electricity is the only alternative if compressed air is not available (if hydraulic solutions are also unavailable).
Electric linear actuators have the advantage of being able to be used in multiple positions in an application. It also has higher axial force, high accuracy, low noise, flexibility through its control characteristics, load stiffness, and lower operating costs.
Types of electric actuator
Rod-style and rodless electric actuators are available with or without motors and drives. In four positions, motors can be mounted axially behind the actuator body or parallel to the actuator.
Typical applications of electric actuators
A wide range of industrial applications uses electric actuators.
For driverless transport vehicles, dispensing and jointing methods – gluing, welding, and riveting – are used.
PET bottles, filling and labeling systems, and robotic applications. Such as milking robots, are all used in the food and beverage industry.
They are widely used in the packaging sector for operations like servo presses and clamping.
As a result of their accuracy, flexibility, and low operating costs. They are used in robotics, electronics, electronic assembly, machine tools, and many other industrial sectors.
Can electric actuators be made to work with anything else?
The equipment must have a suitable electrical supply and associated cabling. There will a need for power and control cables between the motor and drive. To identify the position, actuators may need to mount and switches can use.
Cair is a core Manufacturer, Supplier & Exporter of Electrical Actuators also known as Electric Motorised Actuators in India.