Page 38 - Keubler Motion Sensors

Basics

Linear measuring systems Technology

Magnetic measuring system Limes The LA series are absolute length measuring Overview of features:
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(absolute) systems. Sensor and translator and interpolation unit • No reference necessary.
are together in one housing. The magnetic tape of
up to 8 m measuring lenght, up to 0.001 mm resolution the BA series is paste up to a plain area. The sensor • Direct contact free measurement.
up to 20 m measuring lenght, up to 0.01 mm resolution can be mounted with a max. of 0.2 / 1.5 mm distance • Distance between sensor and magnetic tape can
to the magnetic tape with reduced measuring be between 0.1... 0.2 / 1.5 mm
accuracy. –> Distance not OK = LED glow red.
Different interfaces are available (SSI, CANopen • Up to 8 / 20 m measuring length.
(DS406)). • High resolution 1 / 10 µm.
Typical applications are handling systems, conveyor • Repeat accuracy +/- 1 µm.
and storage technology, hydraulic presses, stamping • Inured against dirt.
machines, casting machines, linear slides, linear
drives and pick and place systems.

Functional principle Figure 1
A hall sensor and a magneto-resistive impedance Shows two magnetic traces, with north pole and
measuring bridge are guided over a two-track south pole magnetization.
magnetic tape with a fine-interpolation trace and an The fine interpolation trace encloses alternately
absolute trace. north and south pole traces with a distance of
Together with the sensor line the absolute track 1 / 5 mm, these are scanned with resistance bridges
provides an absolute value and the fine-interpolation and provide a resolution of 0.001 / 0.01 mm. The
trace provides together with the interpolation absolute value provides the sensor line with 16 single
electronic the measuring systems high resolution. Hall sensors, these sensors are scanning the code
sections of the north and south poles. The absolute
value on the magnetic tape recurs every 8 / 20 m.

Fig. 1: Coding

Interpolation trace
Not magnetised area
Absolute trace

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