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Electric Actuator

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Pneumatic Three-Piece Vacuum Ball Valve

 

What is an Electric Actuator?

An electric actuator is a mechanical device that converts electrical energy into kinetic energy or mechanical force. This force can cause movement in a machine or appliance.

 

 

How Does an Electric Actuator Work?

An electric motor will create rotary motion as the spindle, or rotor, rotates. The motor spindle is directly coupled to a helical screw, via the drive shaft, which in turn rotates in a ball screw nut.
As the spindle rotates the ball screw nut is driven forwards, or backwards, along the helical screw.
A hollow piston rod is attached to the ball screw nut and this creates the linear motion out of, or into the linear actuator as the motor rotates clockwise or anti-clockwise.
The motor is controlled by an electric drive, which allows the rotation speed to be varied and, hence, the linear speed of the actuator. A feedback mechanism gives positional information and the linear actuator can be programmed to move to a certain position, stop and then move on, or return to its rest position.
The power of the motor will determine the torque that can be generated and hence the force that can be put to useful motion through the actuator.

Double Acting Pneumatic Rotary Cylinder

 

 
The Components of an Electric Actuator

Front/Rear Clevis

This is a metal piece that is u shaped, with holes in each end through which a pin, bolt, or fastening device is run. The actuator is allowed to be mounted to the application by clevis attachments on the front and rear.

Outer Tube

This is also called the cover tube. It's an extruded aluminum tube that protects the linear actuators outside and houses all of the inner components of the actuator.

Inner Tube

This is also called the extension tube, translation tube, piston, or drive tube. The inner tube is usually made from aluminum or stainless steel. The inner tube is where the spindle is located, while retracted. This tube is attached to the drive nut that is threaded and extends and retracts when the nut's motion along the rotating spindle.

Spindle Component

This is also called the rotating screw, lead screw, or lifting screw. It is a long rod that is straight that turns in a tool or machine. This segment of the linear actuator rotates, retracting or extending the inner tube, which generates linear motion. The steel spindle ensures strength and durability. There are different ways of threading the spindle for various speed and load capabilities.

 

 

Pneumatic PTFE Lined Plug Valve

Safety Stop

This is located at the end of the spindle. It serves to prevent the inner tube's overextension.

Multi-turn Electric Actuator Intelligent Type With Profibus/Modbus

Wiper Sealing Component

This is a sealing component that is attached to the end of the outer tube. It prevents contaminants such as dust and liquids from entering the spindle area of the actuator. It also ensures that there is a proper seal between the inner and outer tubes, influencing the IP rating of the actuator.

Electric Rotary Actuator 90 Degrees

Drive Nut

This travels along the spindle and is attached to the inner tube. It is the component that permits retraction or extension of the inner tube. The drive nut can be made from plastic or metal and is keyed sometimes to prevent inner tube rotation.

Double Acting Heavy Duty Scotch Yoke Type Pneumatic Actuator

Limit Switches

These control the position of the fully extended and retracted inner tube by cutting current electrically to the motor. These switches do not allow the actuator to overextend or over retract. To add on top of cutting current, limit switches are also able to be used as signal sending devices.

Heavy Duty Pneumatic Pinch Valve

Gears for Electric Actuators

These are made from plastic or steel and mate with other gears to alter the relationship between a driving mechanism's speed and the driven part's speed. The gear that is connected to a power source like the motor is known as the drive gear.

Pneumatic Plastic Butterfly Valve

Motor Housing

This housing contains the gear motor as well as all internal parts without leaving anything exposed to damage from the external. Motor housing is typically made from high-quality plastic.

Electric Rotary Actuator Small

DC Motor

The direct current motor is where all of the electric actuator's power comes from. DC motors are found in different types. There are the most commonly used motors called brushed motors. The motors consist of the following components:

Electric Rotary Valve Actuator

Motor Stator

This is the stationary outside portion of the motor. It consists of the housing of the motor, motor caps, and two permanent magnets. A stationary magnetic field is generated by the stator and it surrounds the rotor.

 

 

Pneumatic CPVC Ball Valve

Rotor

This is also called the armature. It is the motor's inner part that rotates. It consists of a motor shaft, silicon steel laminate, copper windings, and commutator.

Pneumatic Fluorine - Lined Butterfly Valve

DC Motor Commutator

These are a pair of plates that are attached to the shaft of the motor. They bring two connections for the coil of the electromagnet. The commutator functions to reverse the polarity of the motor and essentially keeps the motor in rotary motion without losing torque.

Pneumatic 3 Piece Flange Ball Valve

Carbon Brushes

These make use of sliding friction for the transmission of electrical current from the stator to the motor's rotor.

Electric Three-Way Ball Valve

Motor Shaft

This part serves for the connection of the gear motor to the bottom of the stator on the DC motor.

 

What are Advantages of Electric Actuator?

 

 

Pneumatic Flanged Soft Seal Butterfly Valve

01.Straightforward Design

One of the most important benefits of an electric linear actuator is its simple design. A system consists of a DC or AC motor, a series of gears, and a lead screw with a driving nut that pushes a rod shaft in and out. Meanwhile, hydraulic and pneumatic systems have more complex designs. They always come with more parts, including pumps and hoses.

02.Faster Assembly Time

Putting everything together would be easier since you won't have to deal with pumps and hoses. Installing this only requires simple wiring. The simplified assembly process means faster integration into the entire ecosystem of the facility. This also reduces labor costs due to the amount of time saved.

03.Smaller Footprint

An electric linear actuator is a self-contained unit mounted where the motion is required, which is then connected to the system controller with a small cable. Unlike its counterparts, it doesn't need much space to function efficiently. This gives people more flexibility when incorporating the actuator into the area. On the other hand, a hydraulic actuator system of the same capabilities would usually need more because it comes with more parts. The primary actuator needs to be connected through hoses to a reservoir equipped with a motor. Allotting space for these units would require careful planning, especially for those who have smaller facilities.

04.Easy Integration

Apart from letting you easily install it in a facility with ease, an electric linear actuator can also be integrated with other systems and equipment with no trouble at all. Programming the commands to the controllers that manage the facility's machines is less complicated than doing it with a hydraulic or pneumatic system.

05.Precision and Control

An electric linear actuator provides a higher level of control throughout the entire process. With just a few keystrokes on the controller, the operator fully controls the piston's position and applied force.

06.Safety

If a well-trained operator has complete control, the likelihood of an accident is slim, but it's always best to have safety precautions. This is where electric linear actuators shine. Most of these actuators come with limit switches. They're designed to send a signal to the drive to stop the motion when it reaches full extension and retraction. Limit switches help prevent the machine from stalling after it reaches its limit. If it stalls, the motors will keep going until they break down and burn.

 

Electric Actuator Ball Valve

What are Advantages of Electric Actuator?

Eco-Friendliness

Electric linear actuators only use electricity as a source of energy, nothing else. It's clean and doesn't produce any by-products during use, so the healthcare and medical industries prefer this variant because it can't contaminate anything. Hydraulic systems have high-pressure fluids flowing through hoses, which must be properly maintained. If one part gets damaged, the leak can contaminate products or the facility itself. Meanwhile, pneumatic actuators have compressed air that can blow contaminants into the environment.

Quiet Motor

Noise pollution is also a factor to consider when looking for actuators. Hydraulic systems may bring in more power, but it's also louder because of their high horsepower motors. It's the main reason many refer to them as "bang-bang" devices because of the noise they make when in use.

Low Maintenance

This type of actuator has advanced to the point where it's virtually maintenance-free. Because it has fewer components, it has fewer points of failure. And its parts are easier to troubleshoot and repair or replace since most of them are just wires and gear systems.

Cost-Effectiveness

Since this kind of actuator doesn't have a lot of components, owners don't have to stock up on a lot of spare parts. It lets you cut back on labor costs, too, since it's easier to install, operate, and maintain. Lastly, you won't have to spend much energy as it consumes less power than others. With the advancement of technology, electric linear actuators can now come in different sizes. But all of them are essentially the same device with a motor, gears, and lead screw. All that changes is the size of the motor inside.

 

What Electric Actuator Can Work for?
 

Industrial Automation

Electrical actuators are used in various industrial machines and processes, such as conveyor systems, packaging machines, and assembly lines, to control the movement of components and products.

 

Aerospace and Defense

Electrical actuators are used in aircraft and spacecraft systems, such as landing gear, flaps, and control surfaces, to provide precise and reliable control of motion.

 

Automotive

Electrical actuators are used in various automotive systems, such as power windows, door locks, and seats, to provide comfortable and convenient control of motion.

 

Robotics

Electrical actuators are used in various robotic systems, such as robot arms and grippers, to provide precise and flexible control of motion.

 

Medical Devices

Electrical actuators, such as surgical robots and prosthetic limbs, are used in various medical devices to provide precise and reliable motion control.

 

Consumer Products

Electrical actuators are used in various consumer products, such as home appliances, toys, and electronics, to provide convenient and user-friendly motion control.

 

Our Certificate

 

 

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CE EX for valve actuator

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Ultimate Guide for Electric Actuator

Q: Do you need to apply steady power to an electric actuator?

A: Either pins 1 and 2 or pins 1 and 3 will always have power. Limit switches cut power to the motor when the actuator has achieved the necessary position, be that closed or open.

Q: Do you really need a start capacitor and a brake on an electric actuator?

A: On an AC voltage electric actuator, you will always need a motor start capacitor to give the motor enough power to start. In the closed position, the energized brake holds the motor in place. Without a mounted brake, especially on butterfly valves and damper, there’s a risk that the force of the media within the pipes will push the valve, slightly opening it. The actuator detects the open valve and ensures it rotates back to the completely closed position. This action repeats over and over as the media continuously pushes the valve open. Eventually, this oscillation will damage the motor and actuator.

Q: What is an example of an electrical actuator?

A: Common examples of actuators include electric motors, stepper motors, jack screws, electric muscular stimulators in robots, etc.

Q: What is the function of the actuator?

A: An actuator is a device that produces a motion by converting energy and signals going into the system. The motion it produces can be either rotary or linear. Electric linear actuators, as the name implies, produce linear motion.

Q: How strong are electric actuators?

A: Most heavy-duty linear actuators deliver dynamic forces in the thousands of pound-force. While most common models provide between 1,000 and 15,000 lbf of force, it is possible to find extremely powerful heavy-duty electric linear actuators delivering up to 100,000 lbf of dynamic force.

Q: What are the three main types of actuators?

A: Hydraulic, pneumatic and electric actuators aren't the only types of actuators that are available. Some other types of actuators include thermal and magnetic, mechanical and supercoiled.

Q: Are electric actuators reliable?

A: Electrical actuators can be more safe and predictable in an emergency stop application since they don't depend on trapped air to hold the cylinder in place. The load can be held more reliably also since there is no air leakage between the cylinder and valve.

Q: What are electrical powered actuators most found on?

A: Electric actuators are utilized in materials handling for operations like servo presses and clamping and most commonly used in the packaging sector. Electric actuators are used in electronics and electronic assembly, robotics, machine tools and multiple industrial sectors.

Q: What is the difference between electric actuators and hydraulic actuators?

A: Electric actuator systems typically operate in the 75-80% efficiency range for the work they complete; hydraulic actuator systems typically operate in the 40-55% efficiency range. An additional factor in the electric utility cost equation is that electric actuators only demand current to the motor when it is required.

Q: What is the difference between electric motor and actuator?

A: Think of actuators as devices that help produce linear motion and motors as devices that help produce rotational movement. Hence, some consider actuators as a type of motor. But a motor is not a type of actuator. Both are critical to powering industrial applications and have a purpose in the right setting.

Q: Where are electric actuators used?

A: They are used in materials handling for operations such as servo presses and clamping and widely used in the packaging sector. Their benefits in accuracy, flexibility and low operating costs lead to use in robotics, electronics and electronic assembly, machine tools and many other industrial sectors.

Q: What voltage are electrical actuators?

A: The main voltages of electric actuators are 220V and 380V. 200V voltage generally has low power, and 380V voltage generally has high power. The speed of the 380V motor is relatively slow, but the torque of the 380V motor is large, and the output force is larger.

Q: Why is electric actuator a better control system?

A: Electric valve actuators, particularly those with brushless servo motors, can handle complex motion profiles, deliver high force and high speeds, and offer great accuracy and repeatability. These advantages make electric actuators especially well-suited to process control applications.

Q: Which is better electrical hydraulic actuator or pneumatic actuator?

A: Hydraulic power performance is also superior to electrically operated actuators. Pneumatic actuators: Compressed air won't produce the power that hydraulic actuators generate, but they will be stronger than electrically energized actuators. Pneumatic systems tend to work faster than hydraulic and electric actuators.

Q: What is the difference between pneumatic actuator and electric actuator?

A: An electric actuator is the one which makes use of electrical energy to produce mechanical energy. While, a pneumatic actuator, is an air operated actuator, which converts air pressure into mechanical force to operate the valve. Read on to find the basic points of difference between an electric and pneumatic actuator.

Q: How is an AC two-position electric actuator wired?

A: The terminal strip connects the wires with several pins. Pin 1 is almost always the neutral line. Pins 2 and 3 are the hot line for the closed and open positions. A relay, such as a control switch, splits the hot line.

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