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How Do I Make My PA Actuator Stop at an Exact Position?

Stopping a feedback actuator at a precise mid-stroke position requires a closed-loop control strategy — the controller reads position feedback and cuts motor power when the target is reached. This article shows the most practical approaches.

The Deadband Approach (Simplest)

Rather than trying to stop at an exact single point (which is difficult due to motor coasting), define a small acceptable window around the target — called a deadband. When the actuator enters the deadband, stop the motor.

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Slow-Down Zone for Reduced Overshoot

Full-speed arrival at the target causes overshoot. Add a slow-down zone: when within a larger window of the target, switch to reduced PWM speed. The actuator decelerates before entering the deadband, improving stop accuracy.

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💡  Using the RT-11 remote? The RT-11 smart remote includes 4 programmable memory positions built-in, with automatic stop at saved positions when used with a compatible feedback controller — no custom code needed.