LMA10 linear absolute magnetic system

LMA10 linear absolute magnetic system

More Views

The LMA10 is an absolute magnetic linear encoder system which has been designed for motor control applications as a position and velocity control loop feedback element.

The information carrier is a magnetic scale which consists of a stainless steel substrate with an elasto-ferrite layer. The elasto-ferrite layer is magnetised with two tracks. The incremental track is magnetised with 2 mm long (south or north) poles and the absolute track is magnetised by a pseudo random binary sequence (PRBS) absolute code with 13 bit length. The elasto-ferrite layer is immune to chemical damage.

The readhead includes Hall sensor arrays for PRBS track reading, an AMR sensor for incremental track rading, interpolation electronics and custom logic circuitry. The algorithms of the logic circuitry receive the data from the interpolator and Hall arrays, re-calculate and combine them into absolute position data.

The encoder design provides extremely short response and recovery times, which consequently makes it ideal for applications with high dynamic control loops.

The encoder outputs warning and alarm status information through serial communication channel and status LED. The alarm bit informs the sub-system that the output position data is not valid. The warning bit informs the sub-system that the position data is valid, but that some of the parameters are close to the processing limits.

Setting of zero position is possible by zeroing input on the output cable.

LMA10 communication protocol – BiSS-C unidirectional
Incremental pole length 2 mm
Maximum scale measuring length 16.3 m
System accuracy ±40 μm/m
Short range accuracy < ±10 μm/10 mm
Hysteresis < 2 μm at 0.1 mm ride height
Repeatability Unit of resolution
Available resolutions

0.244 µm

0.488 µm

0.976 µm

1.953 µm

3.906 µm

7.812 µm

1.75 m/s

3.5 m/s

7 m/s

10 m/s

10 m/s

10 m/s

Maximum traverse velocity
Maximum velocity during
power on
0.5 m/s
Signal level RS422
Maximum MA frequency 5 MHz
Length of position data 26 bit          LSB= (2000 μm)/2^13 ≈ 0.244 μm
Length of status data 2 bit
Length of CRC 6 bit (inverted bit output – polynomial 0×43)
Position data encoding Pure binary
Latency time 0.8 μs at 5 MHz MA frequency; otherwise 4 MA clock periods
Recovery time ≥5 μs
LMA10 communication protocol – BiSS-C unidirectional
Power supply 5 V ± 5 % (voltage on readhead)
Consider voltage drop over cable
Set-up time after switch-on < 250 ms
Power consumption (without load) < 150 mA
Voltage drop on the cable 55 mV/m; 35 mV/m (sense lines parallel to power supply)
LMA10 communication protocol – BiSS-C unidirectional
Mass Readhead (with 1 m cable, no connector) 41 g, magnetic scale 60 g/m
Cable PUR high flexible cable, drag-chain compatible, double-shielded 7 × 0.05 mm2 (AWG 30);
1 × 0.14 mm2 (AWG 26) durability: 20 million cycles at 20 mm bend radius at whole temperature range
LMA10 communication protocol – BiSS-C unidirectional
Temperature
Operating 0 °C to +55 °C
Storage -20 °C to +70 °C
Vibrations (55 Hz to 2000 Hz) 300 m/s2 (IEC 60068-2-6)
Shocks (11 ms) 300 m/s2 (IEC 60068-2-27)
Humidity 100 % (condensation permitted)
EMC Immunity IEC 61000-6-2 (particularly: ESD: IEC 61000-4-2; EM fields: IEC 61000-4-3;
Burst: IEC 61000-4-4; Surge: IEC 61000-4-5; Conducted disturbances: IEC 61000-4-6;
Power frequency magnetic fields: IEC 61000-4-8; Pulse magnetic fields: IEC 61000-4-9)
EMC Emission IEC 61000-6-4 (for industrial, scientific and medical equipment: IEC 55011)
Environmental sealing IP68 (according to IEC 60529)

Features

  • True absolute system
  • Suitable for highly dynamic control loops
  • Small footprint
  • High accuracy
  • Resolutions up to 0.244 µm
  • Axis lengths of up to 16.3 m
  • Speeds up to 7 m/s at 0.977 µm resolution
  • Integral status LED
  • BiSS-C unidirectional communication protocol
  • Simple and fast installation
  • Robust measuring principle
  • Excellent dirt immunity to IP68

Buy products by choosing the specifications

Loading configurator...
Delivery time up to: 21 days

Total price:

$13.67

Availability: In stock

More than 10 pcs or need technical assistance? Contact for quote.