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Home> Company News> How to Select a Suitable Linear Motion Module for the Machine?

How to Select a Suitable Linear Motion Module for the Machine?

2025,06,11
Linear motion modules are widely used in the automated industrial field. When selecting a linear motion module, various factors need to be comprehensively considered.?
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1. Vibration resistance and stability: Stability refers to the performance of not having self-excited vibration under given operating conditions; while vibration resistance means the ability of the linear module pair to withstand forced vibration and impact.
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2. Stiffness: The deformation of a linear motion module includes the deformation of the guide rail itself and the contact deformation of the guide rail pair, as well as the ability of the guide rail to resist forced deformation. Deformation will affect the relative position between components and the guiding accuracy.?
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3. Sensitivity and positioning accuracy: The sensitivity of a linear motion module refers to the minimum stroke that a moving component can achieve; positioning accuracy refers to the ability of a moving component to stop at the target position as required. The sensitivity and positioning accuracy of a servo electric cylinder are related to factors such as the guide rail type, friction characteristics, motion speed, transmission stiffness, and mass of the moving component, and are applicable to various linear motion modules.
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4. Accuracy retention: It refers to the ability to maintain the original geometric accuracy during the working process. The accuracy retention of a linear module assembly mainly depends on the wear resistance and dimensional stability of the guide rail. The wear resistance is related to factors such as the material matching of the guide rail pair, force, processing accuracy, lubrication method, and the performance of the protection device.?
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5. Guiding accuracy refers to the precision of a moving component’s trajectory along the guide rail surface. For linear motion modules, key factors influencing guiding accuracy include: geometric accuracy of the guide rail structural design, contact precision of the rail pair, surface roughness, stiffness of the rail and supports, and oil film thickness/stiffness in lubricated systems. Geometric accuracy is typically measured by full-length error or unit-length error, directly impacting the guiding performance of linear stages in precision applications.
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6. Smoothness: The smoothness of a linear motion module refers to the performance of no crawling phenomenon when the guide rail moves at a low speed or moves slightly. The smoothness is related to factors such as the structure and materials of the guide rail pair, lubrication conditions, lubricant? nature, and the stiffness of the transmission system, ensuring the smooth operation of the linear motion module.
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7. Motor: Motor selection should be tailored to specific application requirements: for single-axis arms with minimal demands, stepping motors are adequate; closed-loop stepping motors are suitable for speed-oriented applications; servo motors are recommended when both high speed and precision are needed; and integrated drive-motor servos are ideal for space-constrained environments.?
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