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Micro linear actuators are widely used in applications requiring precise motion control, from robotics to industrial automation. In this article, we’re going to talk about how precise micro linear actuators are, and what factors influence their ability to achieve consistent positioning. We’ll explore the key elements that determine micro linear actuator precision, including stroke length and actuator types, to help you make the best choice for your application.
Understanding Precision and Accuracy in Micro Linear Actuators
Precision and accuracy are often used interchangeably, but they refer to different aspects of motion control.
- Precision (sometimes called ‘repeatability’) refers to how consistently an actuator can reach the same position when given the same command.
- Accuracy is how close the actuator’s actual position is to the intended target.
Think of a measuring tape: if the markings are misaligned, measurements may not be accurate, even if they are consistently repeatable. Similarly, an actuator with high precision but low accuracy will always move to the same spot, but that spot may not be exactly where it was intended to be.
The Relationship Between Stroke Length and Precision
Stroke length—the distance an actuator can extend and retract—affects precision in several ways:
- Longer stroke actuators may have slight flexing or mechanical play over extended distances, leading to small deviations in positioning.
- Shorter stroke actuators tend to have better precision because they experience fewer cumulative mechanical tolerances.
For actuators that use potentiometer-based feedback, stroke length also impacts the resolution of position feedback. Since the feedback voltage range is mapped across the entire stroke, a given voltage change corresponds to a larger physical movement in longer-stroke actuators compared to shorter ones.
Comparing Brushed DC Actuators vs. Stepper Actuators for Precision
Brushed DC Actuators
- Are controlled by voltage adjustments or relay-based switching.
- Can achieve reasonable precision but may exhibit slight variations in stopping position due to motor inertia and mechanical play.
- Are suitable for applications where absolute accuracy is not critical but repeatability is sufficient.
- Are ideal in applications where performance is prioritized over accuracy.
Stepper Actuators
- Highly repeatable movement with well-defined step increments.
- No drift over time, as each step is controlled by an electrical pulse.
- Excellent for applications that demand fine control over small movements.
However, stepper actuators generally have lower load-bearing capabilities compared to brushed DC actuators, as they rely on incremental movements rather than continuous torque delivery.
Factors Beyond the Actuator That Impact Precision
- Mounting stability – If the actuator is not securely mounted, slight shifts in positioning may occur.
- Power fluctuations – Inconsistent voltage supply can affect motor performance and precision.
- Environmental conditions – Factors like vibration, temperature changes, and wear over time can impact actuator precision.
To maximize precision, it’s essential to consider the full mechanical and electrical system, not just the actuator itself.
Conclusion
The precision of a micro linear actuator depends on multiple factors, including stroke length, gear ratio, and actuator type. Shorter stroke lengths and high-gear-ratio actuators tend to offer better precision, while stepper actuators provide the best repeatability at the cost of load capacity. Additionally, factors such as mounting stability, power consistency, and external forces all contribute to the overall performance of the actuator in real-world applications.
Choosing the right actuator for your application requires balancing these factors based on your specific needs. If you need assistance selecting the best micro linear actuator for your project, contact Actuonix today. Our team can help you find the optimal solution to meet your precision requirements.
Frequently Asked Questions
What type of micro linear actuator offers the highest precision?
Stepper actuators typically provide the highest precision due to their incremental movement and controlled positioning. However, brushed DC actuators can still achieve good repeatability in applications where absolute accuracy is not critical.
Can external factors affect actuator precision?
Yes, environmental conditions such as vibrations, inconsistent power supply, and improper mounting can all impact the precision and repeatability of a micro linear actuator.
How does stroke length affect actuator precision?
Shorter stroke actuators generally offer better precision since they experience fewer mechanical tolerances. Longer stroke actuators may introduce slight positioning deviations due to mechanical play and flexing.
Explore Precision Micro Linear Actuators Today
This article provides an overview of micro linear actuator precision, and the factors that impact precision. To find out more about our products, and explore our full range, visit our actuators by model page. As a leading manufacturer and innovator in the micro motion marketplace, Actuonix services companies big and small in a number of industries including aerospace, medical, robotics, and more. Get in touch with us today to submit an order or to submit an inquiry.