Steering encoder units

SKF steering encoder units (fig. 1, product table) are steering input devices for steer-by-wire systems that combine reliable encoder technology with the simplicity of plug-and-play component packaging.
The detailed design of the units is based on well-proven SKF technologies. The units consist of:
  • a sealed SKF Explorer deep groove ball bearing for long service life and reliable performance
  • bearing encoder technology for precise monitoring
  • a friction torque device, which provides feedback to the operator by providing adequate resistance in the steering wheel
  • a mechanical interface for mounting
  • a shaft to connect the steering wheel
The units reliably fulfill the demands of industrial and off-highway vehicle steer-by-wire systems and:
  • do not require any adjustment
  • do not require relubrication during their expected service life and are virtually maintenance-free
  • are supplied ready-to-mount (connection to a steer-by-wire system is achieved by plugs)
Sensor technology and electrical data
SKF steering encoder units use sensors to track the movement of a steering wheel. They contain two sets to provide redundancy. The sensors:
  • are magnetic
  • are non-contact and incremental
  • do not wear
  • are protected from external influences
  • are designed to provide maximum service life
SKF steering encoder units comply with the safety requirements of safety-related control systems in accordance with ISO 13849.

SKF steering encoder units provide two independent sets of square wave signals (fig. 2) via open collector circuits. They require:

  • a regulated voltage supply, which can range from 5 to 24 V DC
  • pull-up resistors (table 1) that should be placed between the voltage supply and the conductors for the output signals to limit the output current to 20 mA
The application load resistance between the ground line and the conductors for the output signals should be at least 10 times higher than the resistance of the pull-up resistor. This keeps the output signals readable.
Units providing absolute position information
SKF can provide customized steering units for applications where a combination of absolute position information, variable steering feel, and active end stops are required. For additional information, contact SKF.
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