Encoder Technology - AksIM™

October 15, 2020


AksIM technology is patented and features an ASIC for multiple encoder sizes. It was developed as a complete solution, i.e. the chip is specialized for this application and was developed together with firmware (FW), other electronic components and magnetization technology. The magnetization of the AksIM technology uses the patented single track magnetization principle with combined incremental and absolute code (pseudo-random code).


AksIM-2™ Off-Axis Rotary Absolute Magnetic Encoder Module

Basic Specification:

  • Available output signals: BiSS C, UART, SSI, PWM, SPI
  • Resolution: from 16 bit to 20 bit
  • Power supply: typ. 5 V
  • Size: between 22 mm and 80 mm

Main Characteristics:

  • True absolute system
  • Customized magnetic sensor ASIC
  • Self-calibration after installation to eliminate eccentricity-related errors
  • No hysteresis
  • High repeatability
  • Resolutions up to 20 bit
  • Multiturn counter option
  • High-speed operation
  • Low profile, non-contact
  • Built-in self-monitoring function
  • Integrated status LED
  • Plug and Play (no calibration required)
  • Resolutions up to 20 bits (one million counts per revolution)

Why AksIM-2?

One of the key advantages of AksIM technology is that no calibration is required after installation. AksIM offers optional self-calibration, which is integrated in the encoder and can be triggered via the controller or PC. The self-calibration process takes a maximum of 10 seconds, requiring neither constant rotation speed nor 360° rotation, but at least 180° rotation, and improves the accuracy of the system by up to 5 times. If there is a mechanical change in the assembly within the installation tolerances and the position between the readhead and the magnetic ring of the encoder changes, the encoders with AksIM technology work without problems and give an accurate absolute position. For this reason, encoders with AksIM technology are very robust.

AksIM AksIM-2
Arc length Short Slightly longer (+line driver, connector)
Connector FFC 6-pin (1.9 mm height) FCI (3.4 mm height)
Connector orientation Tangential Radial & tangential
Signal termination Single-ended RS422 line driver
Power supply 4 V to 6 V 4.5 V to 5.5 V
Temperature range -30 °C to +85 °C -40 °C to +105 °C
External magnetic field ±3 mT ±20 mT
Update rate 200 μs 55 μs
Bandwidth 2.5 kHz 9 kHz
Shaft turn counter Reset to zero at power off Remembers shaft turns and compensates for +/-90° rotation during power-off
Mounting surface Grounded holes Bigger, electrically isolated surface
Additional functions None Zero preset, self-calibration, bidirectional BiSS,etc.

Comparison table between AksIM and AksIM-2

Why AksIM-4?

AksIM-4™ is a non-contact, high performance off-axis absolute rotary encoder designed for integration into applications with limited space and systems with larger diameters. A hollow ring, absolute functionality, and high accuracy make this encoder suitable for many applications.

The AksIM-4™ encoder system consists of an axially magnetised ring and a readhead. The encoders are equipped with BiSS communication interface and offer binary resolutions up to 21 bits per revolution and high accuracy.

AksIM-2 AksIM-4
Resolution From 17 bit to 20 bit and 16 bit multiturn counter option 20 bit and 21 bit
Maximum Speed 10,000 RPM MRA115: 3,150 RPM,
MRA150: 2,400 RPM
System Accuracy ±0.004° to ±0.014° / 14 to 50 arcsec
after self-calibration,
±0.004° to ±0.08° / 14 to 288 arcsec
without self-calibration
Up to ±0.004° / ±14 arcsec
after self-calibration,
Up to ±0.015° / ±54 arcsec
without self-calibration
Current Consumption Typ. 130 mA, max. 150 mA (without load on the outputs) Typ. 125 mA, max. 160 mA (without load on the outputs)
Operating and Storage Temperature –40 °C to +105 °C (standard),
Readhead MB022: –40 °C to +85 °C
–40 °C to +105 °C
Available Ring Sizes (Inner Diameter) 8 mm, 10 mm, 12.7 mm, 20 mm, 25 mm, 30 mm, 34 mm, 40 mm, 55 mm, 64 mm, 68 mm 90 mm, 125 mm

Comparison table between AksIM-2 and AksIM-4

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Posted in: RLS technology