Linear Actuator Backdriving

Backdriving is the result of the load pushing axially on the screw or nut to create rotary motion. Generally, a nut with an efficiency greater than 50% will have a tendency to backdrive. Selecting a lead screw with an efficiency below 35% may prevent backdriving or occur at a somewhat controlled rate. The smaller the lead, the less chance for backdriving or free wheeling. Vertical application are more prone to backdriving due to the force of gravity.

Is it possible to backdrive an actuator?

Backdriving an actuator typically means the ability to manually move the actuator position without power to the motor. The short answer is YES.

In a given application, there are reasons why you may want the ability to backdrive an actuator:

Machine Setup - This allows the mechanism to moved manually for relative positioning to another part of the machine.

Maintenance - Backdriving can provide clearance for a technician to make adjustments or maintenance as needed.

Reset a Homing Position - Backdriving can allow for relative start position to be changed to begin a new cycle.

Safety - If there is a jam in a mechanism, this would allow the actuator to be moved manually.

Utilizing a spring mechanism in the system can allow for an automatic repositioning of the linear actuator without the use of motor power. For example, in a security locking door mechanism. Backdriving can be designed into the system for good use or it can be managed in a way to eliminate it depending on the application.

For more information about linear actuator backdriving, stepper motor linear actuators, or to discuss your needs for your specific application, please contact our team.