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New generation of smart motor sensors ‘double performance’

28 October, 2019

The German sensor-maker Sick has unveiled a second generation of smart motor sensors for servodrives that support its Hiperface DSL single-cable feedback system, with the claim that they represent a “step-change” in resolution and dynamic performance. The EDS 35 single-turn and EDM 35 multi-turn encoders incorporate a newly-developed optical system with dual-channel scanning that achieves 24-bit resolution per single-turn revolution, and a 12-bit mechanical gear design that enables up to 4,096 revolutions for the multi-turn system.

The new encoders have been developed “from ground up” to fit into servomotors with frame sizes from 40mm, offering new opportunities for integration into restricted-space applications where precise speed regulation and control are critical – in printing, packaging or machine tools, for example.

“This brand-new encoder design achieves a factor of two increase in performance capability, compared to our first-generation Hiperface DSL products,” explains Darren Pratt, Sick’s product manager for motion control sensors in the UK. “Capable of collecting, evaluating and transmitting digital data via the single-cable system, these encoders become true smart motor sensors delivering invaluable diagnostic feedback, right from the heart of the machine.”

The encoders are wear- and maintenance-free, and resistant to shocks and vibrations. They offer the option of SIL 2 / PL d certified safety for safe speed monitoring and safe single-turn absolute position. As with other Hiperface DSL encoders, the new devices can record speed, temperature and revolution data, supporting the development of preventative maintenance programmes both for the servodrive and for the machine itself.

Since the Hiperface DSL technology was launched in 2011, it has been adopted by many manufacturers of motors, servo controllers and drive systems including ABB, Beckhoff, SEW Eurodrive, Lenze and B&R.

Sick's EDS 35 single-turn and EDM 35 multi-turn encoders are the second generation to support Hiperface DSL for servodrive applications.

“One of the greatest advantages of Hiperface DSL is in the savings made using a single-cable technology,” says Pratt. In the packaging industry alone, he points out, around 300,000 servodrives are built into new machines every year. With an average motor cable length of around five metres, the technology has the potential to save the industry 1,500km of cable every year. “The saving is not just financial,” he adds, “but also environmental, in the form of reduced use of copper and plastics and also reduced energy consumption as the weight of drag chains is also reduced.”

The EDS/EDM 35 encoders are Sick’s fourth motor feedback sensor family to support Hiperface DSL.

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