Renishaw To Show Resolute Absolute Encoder At MTEC

Renishaw will display its latest range of optical incremental encoders at MTEC, which will take place at the NEC, Birmingham from 27-28 April. Demonstrations will include a 1nm resolution version of Renishaw's Tonic incremental encoder, a magnetic chip encoder and an absolute optical encoder capable of 10 atoms resolution at 220mph and suitable for rotary and linear applications. Renishaw's Resolute absolute optical encoder system gives a 1nm resolution at 100 metres per second for both linear encoder and angle-encoder applications, yet still offers excellent dirt immunity.

Absolute position is acquired immediately at system switch-on, so the exact orientation of axis and motor commutation angle are known without the need for a reference (datum) return. Large set-up tolerances also enable easy installation and high reliability, while low jitter and SDE (sub-divisional error) meet the demands of high-precision stages. The Tonic range of incremental optical linear and rotary encoders now offers 1 and 2nm resolutions, a dual-output encoder interface and is also available with Renishaw's Dual Signal Interface (DSI).

The higher-resolution options comprise a standard Tonic readhead and new interfaces that apply high interpolation rates to achieve fine resolution and low jitter levels of just 0.51nm RMS. For applications requiring one or more operations to be synchronised with a motion axis, the new dual-output interface simultaneously provides analogue and digital signals. For high-accuracy angle encoding, the new Tonic DSI allows two readheads to be used to improve the accuracy and repeatability of a motion system by eliminating eccentricity, bearing wander and all 'odd' error harmonics.

Renishaw's AM4096 magnetic encoder IC offers 12-bit resolution (4096 steps per turn) and is capable of high-speed operation to 30,000rpm. It provides UVW outputs with 16 poles (eight-pole pairs), incremental, absolute, linear (potentiometer), tacho generator and sinusoidal outputs. Typical applications include commutation and high-speed motor control, position and velocity control, potentiometer replacement and optical-encoder replacement.


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