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AksIM™ off-axis rotary absolute encoder


AksIM™ off-axis rotary absolute encoder

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The AksIM™ is a non-contact high performance off-axis absolute rotary encoder designed for applications with limited installation space. The compact, low profile readhead detects and evaluates the magnetic field of a thin, axially magnetized ring.


The 49 mm ring offers 524,288 positions per revolution at a resolution of 19 bits while the larger, 80 mm ring, provides 1,048,576 positions at a resolution of 20 bits. The accuracy of the AksIM™ magnetic encoder system is better than ±0.1° and the maximum permissible speed is over 10,000 revolutions per minute.


The low overall system height together with its true absolute functionality and high speed operation make the new single-track absolute encoder suitable for a wide range of applications including video-surveillance systems measuring the angle of camera rotation, robotic arm joints and motors for detecting position.

All output types (SF, PW, SC, DC, SP, and US)
Reading type Axial reading
Resolution From 16 to 20 bit
Maximum speed > 10,000 rpm
Encoder accuracy ±0.05° (before installation - errors caused by mounting inaccuracy of the readhead, ring and drive shaft are not included)
Final system accuracy Typ. ±0.1°
Hysteresis Less than unit of resolution
Repeatability Better than unit of resolution
All output types (SF, PW, SC, DC, SP, and US)
Supply voltage 4 V to 6 V – voltage on readhead
Set-up time 10 ms (first data ready after switch-on)
Current consumption Typ. 115 mA, max. 150 mA
Output load
PWM, SPI Max. ±20 mA
RS422 120 mA short term, 60 mA limited
ESD protection HBM, Class 2, max. ±2 kV (as per Mil-Std 883 Method 3015.7)
Available communication interfaces Asynchronous serial, PWM, SSI, BiSS and SPI
All output types (SF, PW, SC, DC, SP, and US)
Available ring sizes (outer diameter) 49 mm (ring MRA7)
80 mm (ring MRA8)
Material type (ring) EN 1.4005 / AISI416 or EN 1.4104 / AISI430F
with glued NBR rubber filled with ferrite particles
Mass Readhead (with 1 m cable, no connector) 45 g
Ring MRA7 32 g
Ring MRA8 64 g
Inertia Ring MRA7 13.1 kg×mm2
Ring MRA8 79.1 kg×mm2
Cable Ø4.2 ± 0.2 mm, PUR highly flexible cable, drag-chain compatible, double-shielded
All output types (SF, PW, SC, DC, SP, and US)
Operating -30 °C to +85 °C with static cable
-10 °C to +80 °C with cable under dynamic conditions
Storage -40 °C to +85 °C
Humidity 0 to 100% (condensation permitted)
Environmental protection IP64 (protected against dust and splashing water)
Vibrations 300 m/s2 55-2000 Hz (IEC 60068-2-6)
Shock 300 m/s2 (IEC 60068-2-27), 11 ms, half sine
External magnetic field Max ±3 mT (DC or AC) on top side of readhead


  • True absolute
  • Single track
  • Resolution to 20 bits
  • No hysteresis
  • Non contact
  • High speed
  • Low profile
  • Custom ASIC based magnetic sensor
  • Built-in self-monitoring
  • Integrated status LED
  • BiSS, SSI, PWM, USB, SPI and serial RS422
  • Corrosion resistant magnetic ring

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Lead time up to: 10 working days