Improvements in coupling design address vibration occurrences in servo systems. Other benefits are accurate position repeatability, quiet operation, and more compact component size due to high-torque capability.
Testing was conducted to see the relationship between a coupling's Static Torsional Stiffness and positioning repeatability on an actuator.
2. Testing Equipment:
Testing methodology adheres to JIS B 6192 protocols and the testing equipment used the Anti-vibration type, Disk type and Jaw type couplings where the accuracy of stop position accuracy was measured 7 times.
The gap of Max. and Min. values was calculated and respective values were compared (See Test results).
The origin of position is set at both the center and edge for the max range liner stroke. Max value as testing parameter was written in ± with its half value as below:
4. Testing Conditions:
5. Testing Result:
Static Torsional Stiffness does not gravely impact positioning repeatability on actuators. Sub-micron value variations referenced above are likely due to the precision performance of the actuator.
7. Rubber Durability
Rubber is used as a component to impart damping properties and data on the durability has been accumulated since the advent of anti-vibration couplings in 2007. The graphs below show that even after 100 million drive tests, there is no drop in performance due to rubber deterioration.