Renishaw Introduces True-Absolute Multi-DoF Encoder System for High-Performance Motion Control
Renishaw, a global leader in precision engineering technologies, has unveiled a new multi-degree-of-freedom (multi-DoF) optical encoder system, designed to deliver advanced position measurement in up to six degrees of freedom (6DoF). The system combines one or more RXMA30 1.5D scales with the company’s established RESOLUTE™ absolute encoder readheads, creating a versatile solution for high-performance motion systems where accuracy, speed and repeatability are paramount.
True-Absolute Measurement Without Homing
At the core of the innovation is a true-absolute encoder architecture, eliminating the need for time-consuming homing cycles typically associated with incremental systems. This is particularly beneficial in complex motion environments, where establishing a reference position, especially along secondary axes, can be challenging or impractical.
The RXMA absolute scales are manufactured on a low thermal expansion substrate, ensuring excellent stability across varying operating conditions. This design supports highly repeatable metrology even in demanding thermal and dynamic environments.
Multi-DoF Capability for Advanced Error Compensation
The system’s ability to measure motion across multiple degrees of freedom enables machine builders to identify and compensate for a range of inherent mechanical errors. These include:
- Straightness deviations in linear guideways
- Small translational inaccuracies
- Rotational errors within motion systems
By enabling in-process error compensation, the encoder system enhances process capability and contributes to improved component yield – an essential requirement in precision manufacturing sectors.
Direct X and Y Axis Measurement
A standout feature of the RXMA30 scale is its dual orthogonal scale pattern, allowing direct and independent measurement of motion in both the X and Y axes. This eliminates the need for complex signal processing and provides clear metrology advantages.
For example, Y-axis measurements remain unaffected by thermal expansion in the typically longer X-axis, improving measurement reliability in real-world applications.
Designed for High-Performance Applications
The multi-DoF encoder system is particularly suited to highly dynamic motion platforms, such as XY stages used in semiconductor manufacturing. These applications demand exceptional levels of precision and repeatability to maintain throughput and product quality.
By capturing multiple degrees of freedom along each axis, the system enables real-time monitoring and compensation of motion errors, ensuring consistent performance even under high-speed operating conditions.
Simplified Integration and System Flexibility
Renishaw’s approach also prioritises ease of integration. The system architecture combines distinct measurement axes, simplifying incorporation into existing control loops and ensuring compatibility with a wide range of serial interfaces and motion control platforms.
Machine designers benefit from significant flexibility:
- Readheads can be positioned independently to suit application requirements
- End-exit and side-exit cable configurations simplify routing
- Modular scale and readhead combinations allow tailored system design
Enabling the Next Generation of Precision Motion
With its combination of true-absolute measurement, multi-axis capability, and integration flexibility, Renishaw’s new multi-DoF encoder system represents a significant step forward in precision metrology for motion control.
As industries such as semiconductor manufacturing continue to push the limits of accuracy and productivity, technologies that enable real-time error compensation and robust performance under dynamic conditions will play a critical role in shaping the next generation of advanced manufacturing systems.
For more information: www.renishaw.com
