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New SiGNUM™ RESM optical angle encoders from Renishaw make an ideal fit for direct drive rotary (DDR) motors, eliminating position error and backlash while delivering speeds to over 3,600 rev/min, accuracy to ± 0.5 arc second, plus resolution and repeatability to 0.02 arc second. The RESM encoder features a large diameter, low-profile stainless steel ring that mounts directly to the machine shaft, avoiding coupling losses, oscillation, shaft torsion and other hysteresis errors inherent with sealed encoders. The direct-mount, low-inertia ring design eliminates transmission components and encoder couplings, improving stiffness and dynamic response. Available in industry standard ring diameters from 52 mm to 413 mm, the RESM encoders feature 20 µm scale marked directly on the ring periphery and an embedded IN-TRAC™ auto-phase optical reference mark which is repeatable in both directions.

The SiGNUM™ range was engineered to support advanced machinery requirements for higher speeds, dynamic response and accuracy, while delivering Renishaw's proven ruggedness and reliability in difficult industrial applications. The RESM features unique filtering optics which provide excellent immunity to dirt, dust and scratches. Proprietary SiGNUM™ intelligent signal processing ensures excellent reliability and ultra-low cyclic error (± 40 nm), while comprehensive SiGNUM™ software enables optimum set-up and real-time system diagnostics via a PC's USB port.

The RESM encoders bring advanced performance capabilities and application versatility to a wide range of angular position feedback requirements across industry. Low-profile rings offer a compact, easy-to-install format. Unique taper-mount design optimizes installation ease and accuracy adjustment. The taper mechanism corrects for eccentricity of the mounting shaft, while providing excellent stability against shock and vibration. Easy screw adjustments reduce run-out to ?µm, optimizing control over form error. Large internal diameter simplifies the routing of cables and other supplies through the machine. The Si interfaces can be mounted remotely and a small rugged connector on the readhead cable allows easy feed-through where access is restricted.

As with all Renishaw products, the SiGNUM™ encoder range is fully supported by a worldwide network offering responsive global application advice.