Non-contact torque sensor suits steering systems
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BI Technologies Electronic Components Division product story
Edited by the Engineeringtalk editorial team
Aug 10, 2007
TT electronics has developed a steering sensor based on its Magnetorque technology, designed to track the relative positions of two steering shaft segments that are connected by a torsion bar.
Providing automotive design engineers with an noncontact torque sensor designed for electric power steering systems, TT Electronics' BI Technologies Electronic Components Division has developed a steering sensor based on its Magnetorque technology.
The sensor features dual phased outputs for reliable diagnostic characteristics.
According to Dan Sparks, Vice President of the Automotive Business unit for BI Technologies' Electronic Components Division, the Magnetorque technology is designed to track the relative positions of two steering shaft segments that are connected by a torsion bar.
"Our design is in that it does not require the use of clock springs or slip rings to convey power and signal between rotating and nonrotating portions of the sensor".
"Magnetorque is a true noncontacting sensor technology".
"Because of this feature, mechanical durability is extremely high".
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 Magnetorque sensor has an accuracy of +/-3% (+/-1.5% available) and hysteresis of 1%, with a rotational life of 25 million revolutions.
Operating voltage is 5.0V (+/-10%), with a maximum current consumption of 10mA per output.
Operating temperature range is -40C to +125C.
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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