Electric Linear Actuator

A: Electric actuators require minimal maintenance. Regularly check for wear on mechanical components, ensure proper lubrication (if applicable), and keep the electrical connections clean and secure.

A: Yes, electric actuators are highly energy-efficient, particularly in applications requiring static hold, as they consume no power when maintaining a position.

A: Yes, with proper sealing and materials, electric actuators can operate in outdoor conditions. Look for actuators with an IP rating suitable for your application.

A: Many electric actuators come with built-in limit switches, overload protection, and position sensors to enhance safety and precision.

A: An electric linear actuator is not the same as a DC motor. A DC motor uses electro-magnetic fields to convert direct current (DC) electrical energy into torque at the motor shaft. The magnitude and direction of the torque are proportional to the magnitude and direction of the electrical current.

An electric linear actuator contains a DC electric motor. It converts the motor’s torque into the linear motion of a piston with piston extension or retraction determined by the direction of the motor rotation and the piston’s dynamic force determined by the amount of motor torque and gear train torque ratio.

A: The speed of a linear actuator piston depends on factors such as the attached mass, the variable orientation of linkages, dynamic friction, the force of gravity, and the power delivered to the DC motor. Thus, even if two linear actuators receive the same voltage, they will almost certainly run at different speeds in response to their connected load.

Synchronous motion control requires a control loop that processes position feedback from your linear actuator and automatically varies the drive power to achieve a consistent motion trajectory. Two or more linear actuators operating under position feedback control with matching trajectories will run synchronized regardless of variations in the load.

A: Electric linear actuators perform best when forces are applied along the axis of the piston as the piston extends or retracts. They are equally efficient at pushing or pulling loads attached between the piston and body fasteners.

Designers should use mounting clevises and pins to mount linear actuators and allow the load and actuator to rotate with low friction. Low friction rotation is essential, for instance, when a linear actuator opens a panel that rotates about its hinge. The angles between the linear actuator, panel, and base will change as the panel opens.

Most linear actuators do not support forces applied off-axis of the piston. Also known as side-loading, these forces will cantilever the piston against the outer cylinder. Side loading can lead, for instance, to premature wear of the piston and cylinder interface and degrade any seal required for debris intrusion prevention. It may also deform or wear the piston, lead screw, and drive nut. When designing your system, ensure the linear actuator is supported by an external structure, joint, or rail so that it is not side-loaded.

A: Electric linear actuators are incredibly versatile tools suitable for various industries and applications. As you design and prototype to learn the limits of linear actuators, be aware of these common failure modes.

Over-current will damage DC electric motors and cause an open or short circuit of brushes, commutator, or armature windings. One of the most common causes of overcurrent is the failure to remove the drive voltage after the motor stalls. It may stall upon reaching the extent of the piston or under a load that exceeds the maximum dynamic force.

Overheating an electric linear actuator will damage the electric motor and the gear train. Actuators most commonly overheat when running at a frequency exceeding their rated duty cycle or operating under high load at elevated environmental temperatures.