In this paper, we will present an innovative torque sensor design which could be preferably used in Electric Power Assisted Steering (EPAS) application. This torque sensor is a non-contact Hall effect design. The specificity of this structure is its ability to measure the shift angle between two rotating shafts linked by a torsion bar. This measurement is done with stationary electronic components. This unique structure generates enough magnetic flux variation to measure angular shifts from +/-1° to +/-8° with low-cost standard Hall ASICs available from various suppliers. This torque sensor has convinced automotive industry due to its good performances, its compact dimension and a price compatible with the market expectation for this application.This paper will explain the basic magnetic principle of this torque sensor, the improvements which have lead to a structure compatible with automotive industry requirements, some measurement results and possible sensor integration in the application.
Development of a Contactless Hall Effect Torque Sensor for Electric Power Steering
Sae Technical Papers
SAE 2006 World Congress & Exhibition ; 2006
2006-04-03
Conference paper
English
Development of a contactless Hall effect torque sensor for electric power steering
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