Home > New true-absolute linear and rotary encoders are providing machine builders with more accuracy

New true-absolute linear and rotary encoders are providing machine builders with more accuracy

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article image RESOLUTE encoders

Siemens DRIVE-CLiQ is an innovative and powerful communications interface designed to connect encoder and direct measurement systems with SINUMERIK and SINAMICS drive components.

RESOLUTE true-absolute optical encoder with DRIVE-CLiQ interface allows machine builders to achieve higher performance and greater reliability. With its ability to determine position immediately upon switch-on, the encoder is particularly suitable for use in high-performance lathe spindles as well as DDR torque motors requiring high levels of precision and motion control integrity.

RESOLUTE DRIVE-CLiQ offers excellent motion control performance. RESOLUTE's unique operating principle is analogous to an ultra-high speed digital camera, capturing images of the scale, enabling resolutions up to 1 nm to be achieved even at speeds up to 100 m/s. Advanced optics mean the detection scheme also has intrinsic low Sub-Divisional Error (SDE) and very low noise (jitter), benefitting users with lower velocity ripple and rock-solid positional stability.

In addition to high-fidelity motion control performance, RESOLUTE offers ruggedness and reliability, with sealed readheads and scales constructed from dependable shatter-proof engineering materials. The non-contact format eliminates bearings, seals, couplings and guideways from the encoder design, thereby also eliminating common causes of shock/ vibration-induced encoder failure. Even if the main seals on the axis fail, RESOLUTE readheads are sealed against ingress of oil and coolant, minimising downtime and simplifying servicing/repairs.

The non-contact format also helps improve system metrology. RESOLUTE rotary encoders read a solid stainless steel scale that is locked to the axis shaft so the encoder does not suffer from the mechanical backlash, wind-up and coupling losses affecting traditional enclosed encoders.

Rotary scales include options with accuracy better than ±1 arc second, low-inertia versions and sizes from 52mm to 550mm, with custom sizes also available. The large through-hole allows the encoder to be mounted much closer to the point of interest without complicating the routing of services to payloads.

Linear encoders, with both stainless steel and ZeroMet (low expansion nickel-iron alloy) scales share many of these advantages, mounting direct to the machine's structure or track guided. With precision-graduated unique single-track absolute code, linear scales include options with accuracy better than ±1 micron, or tape scales up to 10 metres long.

The detection scheme is inherently dependable, featuring advanced cross-checking and high levels of redundancy. True-absolute position is determined every time, and safety is also enhanced by RESOLUTE's unique built-in position checking algorithms. By determining position immediately at switch-on, RESOLUTE achieves complete control of the axis without any movement, reference returns or battery back-up.

Thanks to the effectiveness of these safety features, RESOLUTE is being used in a variety of medical, defence and aerospace applications where reliability of position data is of primary and critical importance.

For the machine builder, RESOLUTE offers a quick and simple installation experience. 

Renishaw Oceania represents the Renishaw Group in Australia.

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