Magnetic sensors for steer-by-wire

  • 06-Jul-2009 12:46 EDT
MR TFD Section.jpg

Noncontact magnetic TFD sensors from Lord produce a continuously variable resistive steering torque, delivering high-fidelity tactile feedback and maximum control to the operator in steer-by-wire applications. The TFD device, available in 5 and 12 N·m (8.9 lb·ft) configurations, contains multiple rotational sensors that translate operator movement of the steering wheel into electrical signals for controlling vehicle direction. System redundancy is customizable to vehicle type or use; typically, a minimum of two sensors are used for industrial trucks and up to three or four for higher-speed vehicles that are used in public areas such as agricultural tractors and marine vehicles. A typical TFD device includes an input shaft to which the steering wheel is attached, a housing in which two bearings locate and support the shaft, a first sealed chamber containing a magnetically responsive rotary brake, and a second chamber containing the sensor and other electronics. The sensor circuit board is attached to the housing and located above the magnet. When the steering wheel is rotated by the operator, the magnet also rotates and the moving magnetic field generates signals inside the sensor chip which are then processed for communication to the rest of the steering system.

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