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High Performance Rotary Encoders for Machine Tools from Renishaw Oceania

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article image Rotary Encoders

Rotary encoders from Renishaw Oceania provide precise position feedback for high-end machine tools.

RESOLUTE rotary encoders offer the benefits of being a true absolute encoder.

This means the encoders acquire absolute position immediately upon switch-on, so the machine knows the exact orientation of the axis and motor commutation angle without the need for a reference (datum) return.

This is particularly useful in the case of direct-drive rotary motors or while upgrading to direct encoder feedback on gear-driven rotary axes.

RESOLUTE, SiGNUM and TONiC rotary encoders

RESOLUTE, SiGNUM and TONiC rotary encoders help the world’s leading machine tool manufacturers achieve optimum performance:

  • Improve surface finish performance
  • Increase accuracy
  • Increase work output
  • Reduce heat build-up
  • Increase servo loop gains on direct-drive axes
  • Simplify axis design
  • Reduce cost of ownership
These rotary encoders achieve these performance benefits with two major advantages over traditional enclosed encoders.

Being non-contact, the encoders eliminate backlash, shaft wind-up and other mechanical hysteresis errors that plague traditional enclosed encoders.

SiGNUM and TONiC apply dynamic signal conditioning including Auto Gain Control, Auto Offset Control and Auto Balance Control to ensure exceptional signal purity.

Consequently, Sub-Divisional Error (SDE) is controlled to ±30 nm (±0.06 arc seconds on 206 mm Ø RESM).  

RESOLUTE encoders incorporate advanced optics that inherently control SDE to ±40 nm (±0.08 arc seconds on 209 mm Ø RESA). The result is significantly improved velocity ripple for better contouring performance.

Renishaw also offers low noise variants of SiGNUM and TONiC encoders for high-resolution axes demanding the ultimate precision control. The reduced jitter improves positional stability.

RESOLUTE has inherent low noise (jitter) of <10 nm RMS.

RESOLUTE absolute encoders and SiGNUM incremental encoders offer a variety of high-accuracy scale options that enable simple integration and quick, easy installation combined with linear encoder accuracies to ±1 µm and angle encoder accuracies to ±1 arc second.

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