LM13 linear magnetic encoder system

LM13 linear magnetic encoder system

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The LM13 is a contactless high-speed linear magnetic system designed for use in harsh environments.

 

The system consists of a compact readhead and a self-adhesive magnetic scale.

 

Simple to install, the LM13 features an integral set-up LED on the readhead, wide installation tolerances and an applicator tool for the adhesive-backed magnetic scale. A bidirectional reference is provided that can be either actuated by a preset mark integrated within the scale or by adding a reference sticker on top of the scale with the help of a self aligning installation tool.

 

The encoder comes in digital output variants and offers a range of customer selectable resolutions 1 µm, 2 µm, 4 µm, 5 µm, 10 µm, 20 µm, 25 µm, 50 µm, 125 µm and 250 µm. The LM13 is capable of velocities up to 25 m/s; even at 1 µm it is capable of 4 m/s.

 

Due to it's compact size and internal build, the LM13 is also suitable for partial arc applications. The self adhesive magnetic scale can be installed on surfaces with a minimum radius of 60 mm.

 

Engineered for extreme service, the solid-state LM13 linear encoder operates from -10 °C to +80 °C, has water-proof sealing to IP68 and is highly resistant to shock, vibrations and pressure. The robust magnetic scale is also resistant to a range of chemicals commonly found in industry. The non-contact, frictionless design eliminates wear while reducing hysteresis giving precision at high speeds and accelerations.

 

The LM13 linear encoder system brings reliable solutions to tough, hard-working applications including woodworking, stone-cutting, sawing, metalworking, textiles, packaging, plastics processing, automation and assembly systems, laser/flame/water-jet cutting, electronic assembly equipment etc.

 

For applications which demand that the MS scale can be removed easily please consider TRS track system.

All output types (IC and AV)
Maximum measuring length of MS scale 50 m (100 m special order)
Pole length 2 mm
Available resolutions 1 μm, 2 μm, 4 μm, 5 μm, 10 μm, 20 μm, 25 μm, 50 μm, 125 μm and 250 μm
Maximum speed

 

For analogue voltage output: 25 m/s

For digital output signals:

Resolution

(µm)

Interpolation factor

Maximum speed

(m/s)

1

2000

4.16

1.04

0.52

0.26

0.13

2

1000

8.32

2.08

1.04

0.52

0.25

4

500

16.64

4.16

2.08

0.99

0.51

5

400

20.80

5.20

2.59

1.30

0.63

10

200

25.00

10.40

5.20

2.59

1.27

20

100

25.00

10.40

5.20

2.59

1.27

25

80

25.00

6.50

3.25

1.62

0.79

50

40

25.00

6.50

3.25

1.62

0.79

125

16

N/A

25.00

25.00

25.00

15.14

250

8

N/A

25.00

25.00

25.00

25.00

Edge separation (μs)

0.12

0.50

1

2

4

Count frequency (kHz)

8333

2000

1000

500

250

Precision class ±20 µm/m and ±40 µm/m
Linear expansion coefficient of MS scale ~ 17 × 10-6/K
Repeatability Better than unit of resolution
Hysteresis < 3 µm up to 0.5 mm ride height
Sub divisional error ±3.5 µm for < 0.7 mm ride height
±7.5 µm for 1 mm ride height
LM13IC – Digital output signals
Output signals 3 square-wave signals A, B, Z and their inverted signals A-, B-, Z-
Reference signal 1 or more square-wave pulse Z and its inverted pulse Z-
Signal level Differential line driver to EIA standard RS422:
UH ≥ 2.5 V at -IH = 20 mA
UL ≤ 0.5 V at IL = 20 mA
Permissible load Z0 ≥ 100 Ω between associated outputs
IL ≤ 20 mA max. load per output
Capacitive load ≤ 1000 pF
Outputs are protected against short circuit to 0 V and to +5 V
Alarm High impedance on output lines A, B, A-, B-
Switching time (10 to 90 %) t+, t- < 30 ns (with 1 m cable and recommended input circuit)
Cable length max. 100 m (please consider voltage drop over cable)
LM13AV – Analogue output signals (1 Vpp)
Output signals V1, V2, V0
Sine / cosine signals
Amplitude (with 120 Ω termination) 0.6 Vpp to 1.2 Vpp
Phase shift 90° ± 0.5°
Reference signal
Amplitude (with 120 Ω termination) 0.8 Vpp to 1.2 Vpp
Position 45°
Width 22.5°
Termination Z0 = 120 Ω between associated outputs
Cable length max. 50 m (please consider voltage drop over cable)
LM13IC – Digital output signals
Power supply 4.7 V to 7 V – voltage on readhead
Reverse polarity protection
Power supply rise time < 1 ms (for PRG option only)
Power consumption < 35 mA
LM13AV – Analogue output signals (1 Vpp)
Power supply 4.7 V to 7 V – voltage on readhead
Reverse polarity protection
Power consumption < 50 mA
All output types (IC and AV)
Mass Readhead (1 m cable, no connector) 80 g, Cable (1 m) 34 g
Magnetic scale (1 m) 60 g, Cover foil (1 m) 3.5 g
Voltage drop over cable ~ 13 mV/m – without load
~ 54 mV/m – with 120 Ω load
Cable Ø4.2±0.2 mm, PUR high flexible cable, drag-chain compatible, double-shielded
8 × 0.05 mm2; durability: 20 million cycles at 20 mm bend radius
All output types (IC and AV)
Temperature

Operating   -10 °C to +80 °C

                     (cable under non-dynamic conditions: -20 °C to +85 °C)
Storage       -40 °C to +85 °C

Environmental sealing IP68 (according to IEC 60529)
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 magnet fields: IEC 61000-4-8;
Pulse magnetic fields: IEC 61000-4-9)
EMC Interference IEC 61000-6-4 (for industrial, scientific and medical equipment: IEC 55011)
Vibrations (55 Hz to 2000 Hz) 300 m/s2 (IEC 60068-2-6)
Shocks (11 ms) 300 m/s2 (IEC 60068-2-27)

Features

  • Compact readhead
  • Resolutions from 250 µm to 1 µm
  • Stick-on reference mark
  • High speed operation
  • Excellent dirt immunity
  • Integral set-up LED
  • High reliability from proven non-contact sensing technology
  • Industry standard digital output options
  • Repeatability inside resolution
  • Suitable for partial arc applications
  • TRS track system compatible
  • Distance coded reference mark compatible

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