The Mercury II encoders’ specifications include the following vacuum models up to 10-8 torr; long-Range Accuracy up to ±1ìm; short-Range Accuracy up to ±20nm; rotary resolutions up to 268M CPR; and linear resolutions from 5 µm to 1.2nm.

The linear encoders offer linear glass with limits and stick-on index (low expansion glass available); cut-to-length PurePrecision laser tape with limits and stick-on index; and rotary scales.

The Mercury II encoders also feature software for encoder data plots and setup, lowest power consumption, robust tolerance to scale contamination, user-programmable resolution, wide setup tolerances and tiny sensors.

Mercury II encoders allow compact system designs with a sensor measuring 8.7mm and tape scale 6mm wide. The models include programmable interpolation of up to x16384. The operator can benefit from analog or digital output from the sensor, particularly a smaller footprint as well as a variety of connector options such as customer-specific connectors.

The Mercury II encoders’ small size, integrated interpolation electronics, excellent operating performance, ease of installation and low power consumption are perfect for metrology and precision motion control applications. Ultra-high speed applications are well supported by faster A-quad-B output, as well as serial word versions of up to 10m/s with 1.2nm resolution.

In addition to the new linear encoders, MicroE Systems develops small-diameter rotary, vacuum-rated models and low-cost PCB mount that are all RoHS compliant.

Motion Control Tips

The TTK70 encoder features a small yet robust read head – which is barely bigger compared to a match box – is very compact and easy to install, and it is best suited for applications with limited space.

The new linear is very flexible with a very wide range of interface options such as DeviceNet, Profibus, CANopen and SSI/SinCos that enables simple integration into PLC-based installations. It is also available with Hiperface interface that enables the encoder to deliver highly dynamic linear motor feedback.

With a high level of resistance to wet, dust and dirt environments – thanks to its IP65 rating and magnetic operating principles – the TTK70 gives high reliability even in the harshest of operating conditions.

This new encoder is best suited for use in cutting, metal forming, handling systems and processing PCB print and assembly, as well as medical scanning equipment and flatbed printers.

The TTK70 can be operated at up to 10m/s to make it a reliable solution for even the most rapid of axes. The new encoder can also measure up to 4m in length by using its absolute coded magnetic tape measuring up to 4m in length and 10mm in width.

Motion Control Tips

The company recently introduced the LIC 4000, a scale encoder with a resolution of 1 nm that is geared towards equipment for the medical markets, general motion, and semiconductor industries. Continued Kaufenberg, “the general rule in the motion industry is that if you want to position to 1 mm, then you should have ten times better the resolution, or 100 nm in that case. Someone could use the LIC 4000 encoder system to position to 10 nm.
Along with the high resolution, the encoder features absolute position measurement. The multi-substrate scale tape linear encoder reads current position immediately upon switch-on, eliminating the need for reference runs. Absolute encoders are well suited for use on direct drives. Together with the current position, the commutation offset is known immediately upon switch-on, so the motor can be provided with power and held in the control loop. Critical operating states, such as switching on a vertical axis with direct drive or retraction after an emergency stop, are controlled safely.

These encoders are insensitive to contamination, including electromagnetic interference. They use the Endat interface, which constantly checks itself for the proper data transmission. If encoders are mounted next to motors, electromagnetic noise can interfere with encoder signals. But with HEIDENHAIN cables and the Endat interface, the cyclic checks prevent miscounts in the encoder interface, which helps ensure safe motion.

The dimensions of the LIC 4000 match those of the company’s LIDA 400 incremental linear encoder for an easy retrofit. Thus, today’s motion control equipment can use absolute measurement technology by exchanging the encoders. Only the subsequent electronics must be adapted correspondingly.

HEIDENHAIN Corp.
www.heidenhain.com

Motion Control Tips