Linear motion modules are widely used in the industrial automation fields. So, how to select a high-performance linear module for the machine?
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.
2. Stiffness:
The deformation of a linear motion module includes the deformation of the guide rail itself and the contact deformation of the linear guide system, as well as the ability of the guide rail to resist forced deformation.
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.
4. Accuracy Retention
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, force, processing accuracy, lubrication method of the guide rail pair, and the performance of the protection device.
5. Guidance Precision
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.
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.
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.
