Linear Scales for Machine Tools and Production Machines

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AMO AMOSIN - Inductive Length & Angle Measuring Systems

Dynamic and accuracy without any hysteresis - Machine construction places the highest demand on the precision and reliability of measuring systems. Machine precision, in the range of micrometers, is hard to achieve in the very dirty environment found in machine tool operation. In particular, our guided, encapsulated inductive length measuring systems satisfy exactly these demands, even when the length to be measured is extremely long.

The AMOSIN measuring systems are supplied in 2 principal versions: an open, non-contacting system, or as a guided, encapsulated system. Operating entirely on an inductive basis, the AMOSIN systems achieve high precisions of up to +/- 5 µm/m, but are nevertheless very well able to resist environmental influences and extremely high resistance to shock and vibration

The high precision is mainly due to the procedure used to manufacture the rigid steel measuring tape, and to the exceptionally high quality sensor signal, with deviations in the sine wave down to < 0.1 % harmonic content, as a measure of the achievable interpolation precision within the grating pitch.

Reference marks are integrated on the measuring tape, and can be supplied with a single, multiple, or distance coded patterns. The purely inductive scanning allows for the high protection class IP67 where the operation of the systems is not affected by contamination and pollutants in the form of dust, smoke, or liquids. Optical encoders require a complicated mechanical encapsulating enclosure, and also commonly incorporate air purging to protect the optical scale – neither which are necessary with the AMOSIN encoders.

Particularly noteworthy is the insensitivity from magnetic interference as there are no magnetic components in the purely inductive scanning and a completely different technology than magnetic encoders. As a result it is not at all sensitive to electromagnetic interference of any kind and has no measurement hysteresis (machine backlash error).

Miniature encoder heads with narrow 10mm width measuring tape make integration in space-limited applications easy. AMOSIN offers large scanning head clearance and tolerance. As a result it also features very low dependency of the precision of the system on the operating temperature and has a standard working temperature range of 0-70 °C.

The evaluation electronics provides an incremental output either as a sinusoidal or as a square wave signal (RS-422). The 1Vpp sinusoidal signal is available with period length down to 20 µm. Alternatively a TTL square wave output with resolution down to 0.125 µm can be used. In addition to the periodic quadrature signals (A, B and their inverted) a reference signal is output for the determination of absolute position.