L i n e a r
M o t i o n
HIGH-GAIN RESPONSE
LOW-GAIN RESPONSE
TIME (MSEC)
This diagram shows time required for axis stabilization with changes in that value due to gain.
RESULTS AFTER 108 TESTS
ANGLE (RAD)
RESPONSE WITH HIGH-GAIN RUBBER COUPLING AND DISC-TYPE COUPLING DISC TYPE
ACCELERATION (M/SEC2)
HIGH-GAIN RUBBER TYPE
Connect and discuss this and other engineering design issues with thousands of professionals online
ANGLE (RAD)
These are the results of 108 drive tests. In short, rubber has durability ... there’s no degradation of performance due to deterioration in couplings that include the material. Plus rubber in couplings effectively imparts damping properties.
NBK America | nbk1560.com/en-us
WHAT DO YOU THINK?
AFTER
BEFORE TORQUE (N·m)
effectively imparts damping properties. Data on the material’s durability has accumulated since the advent of high-gain couplings in 2007. Plots of torque versus angle show that even after 108 drive tests, there’s no degradation of performance due to rubber deterioration in couplings that include the material. Know that in the future, servomotors will need ever-higher frequency response — along with demand for higher precision and higher speed. So industry will continue demanding coupling technology that melds high torsional rigidity and high-level damping properties to maintain peak servosystem performance. For more information — including actual exported results from coupling tests detailed in this feature — visit couplingtips.com and search on “Kei Yamada” and NBK. Also refer to Atsushi Matsubara’s 2008 piece, “Design and Control of Precision Positioning and Feed Drive Systems” and Nabeya Bi-tech Kaisha technical data in the 2017 NBK General Catalog. DW
COMMANDED POSITION
TORQUE (N·m)
This is the internal structure of high-gain rubber type coupling.
MOTOR SPEED (RPM)
STABILIZATION TIME t₁ (HIGH GAIN) AND t₂ (LOW GAIN)
TIME (SEC)
TIME (SEC)
This is a performance comparison of two leading servocoupling types.
DESIGN WORLD
Linear Motion 10-17_Vs6.LE.LL.indd 65
www.designworldonline.com
October 2017
65
10/3/17 9:32 AM