Non-contacting torque sensor
31 October 2007
Passive Components
Providing automotive design engineers with a non-contacting torque sensor designed for electric power steering systems, BI Technologies has developed a steering sensor based on its Magnetorque technology.
The sensor features dual phased outputs for reliable diagnostic characteristics. The Magnetorque technology is designed to track the relative positions of two steering shaft segments that are connected by a torsion bar, making it unique in that it does not require the use of clock springs or slip rings to convey power and signal between rotating and non-rotating portions of the sensor.
Magnetorque sensors are programmable for gain and offset. At the time of assembly, customers can program the gain and offset values, allowing for adjustments to the mechanical tolerances in their system. This allows customers to use looser system mechanical tolerance, resulting in cost savings and a more accurate system. The sensor has an accuracy of ±3% (with ±1,5% options also available) and hysteresis of 1%, with a rotational life of 25 million revolutions. Operating voltage is 5,0 V, with a maximum current consumption of 10 mA per output. Operating temperature range is -40°C to +125°C.
The Magnetorque sensor can be integrated into a single package with BI Technologies' digital angular position sensor (DAPS) technology. This provides a torque and position signal in one convenient space saving package. Integrated connector and lead wire options are also available.
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