Encoders feature tiny code disc

A SICK (UK) product story
Edited by the Engineeringtalk editorial team Apr 24, 2007

Sick's SKS/M36 stand-alone enables absolute synchronisation in a compact, robust and cost-effective package.

The SKS/SKM36 stand-alone encoder, from Sick, is the first member of a new generation of optical encoders within the company's SinCos product range.

The most notable feature of this new generation of Sick Stegmann encoders is the company's MiniDisc (MiDi) technology - the subject of three year's of development and a Eur 1.9 million investment.

This significant research programme has resulted in the creation of a very small code disc, with a tiny 2mm code track radius.

The whole disc is scanned constantly, enabling any eccentricity errors in the ball bearing and shaft to be compensated for, errors inherent in more conventional systems.

The smaller radius also removes many of the issues related to high angular speeds.

Shock and vibration often cause problems for optical encoders, but the construction of a MiniDisc encoder ensures a very high resistance to both.

Unlike conventional encoders, where a small area at the centre of the disc is glued to the encoder shaft, the disc of a MiniDisc encoder is fitted inside the shaft and securely held around its circumference.

Together with its small size, this makes it virtually impossible to break the disc or shake it loose.

This small disc radius offers other important technical features.

The physical encoder size is now essentially determined by the mechanical and electrical interfaces.

"Chip on board" technology is used to reduce the size and number of the electrical components, maintaining the small size and ensuring the highest reliability.

The small size of the SinCos SKS/SKM36 stand-alone will also enable the use of the encoder in applications with restricted space.

Designed for use as a master encoder with servo drives equipped with the Hiperface interface, the SKS/M36 stand-alone enables absolute synchronisation in a compact, robust and cost-effective package.

Such master/slave installations are commonplace in packaging, printing, textile and woodworking machinery.

Available in single and multi-turn variants (SKS and SKM respectively), the IP65-rated encoders offer: industry-standard M12 connectivity; absolute position with a resolution of 4,096 steps per revolution (single-turn); measurement of 4,096 steps per revolution over 4,096 revolutions (multi-turn); an electronic type label so that the drive can automatically recognise the resolution of encoder connected; and a wide operating temperature range of -20 to 100C.

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