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Torque Sensor for Automotive Applications

Persson, Oskar LU and Persson, Gustav (2015) In CODEN:LUTEDX/TEIE EIE920 20151
Industrial Electrical Engineering and Automation
Abstract
The use of sensors in the automotive industry is increasing, improving performance and safety of the vehicles. The ambition at BorgWarner TorqTransfer Systems AB is to increase torque accuracy to optimize their powertrain solutions. Different methods to measure torque on a rotating shaft is presented and evaluated.
The method that was selected was the magnetoelastic method. This method utilizes the effect where the magnetic properties changes in a material in response to mechanical stresses. A circularly magnetized ring divided into two oppositely polarized bands was press-fitted onto the main shaft of the coupling together with an isolation ring. When the ring is subjected to torque it generates a magnetic field that is dependent on the... (More)
The use of sensors in the automotive industry is increasing, improving performance and safety of the vehicles. The ambition at BorgWarner TorqTransfer Systems AB is to increase torque accuracy to optimize their powertrain solutions. Different methods to measure torque on a rotating shaft is presented and evaluated.
The method that was selected was the magnetoelastic method. This method utilizes the effect where the magnetic properties changes in a material in response to mechanical stresses. A circularly magnetized ring divided into two oppositely polarized bands was press-fitted onto the main shaft of the coupling together with an isolation ring. When the ring is subjected to torque it generates a magnetic field that is dependent on the torque which is then measured using a agnetometer. Two shafts were fitted with the sensor concept for testing, of which one shaft was weakened to get higher stresses in the sensing element. A series of test were conducted to measure the sensors response and sensitivity. The magnetoelastic material was tested before assembling the sensor, it showed a relatively linear dependency between stresses and magnetic field, within the tested range. The test result from the weakened shaft clearly shows the torque induced variations of the magnetic field. The proposed solution demonstrates the potential of making a compact sensor with few components with possibilities to be integrated in BorgWarner products. (Less)
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author
Persson, Oskar LU and Persson, Gustav
supervisor
organization
course
EIE920 20151
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
Polarized band, Magnetoelastic, Torque sensor
publication/series
CODEN:LUTEDX/TEIE
report number
5352
language
English
id
7368714
date added to LUP
2015-06-23 15:48:33
date last changed
2015-06-23 15:48:33
@misc{7368714,
  abstract     = {The use of sensors in the automotive industry is increasing, improving performance and safety of the vehicles. The ambition at BorgWarner TorqTransfer Systems AB is to increase torque accuracy to optimize their powertrain solutions. Different methods to measure torque on a rotating shaft is presented and evaluated.
The method that was selected was the magnetoelastic method. This method utilizes the effect where the magnetic properties changes in a material in response to mechanical stresses. A circularly magnetized ring divided into two oppositely polarized bands was press-fitted onto the main shaft of the coupling together with an isolation ring. When the ring is subjected to torque it generates a magnetic field that is dependent on the torque which is then measured using a agnetometer. Two shafts were fitted with the sensor concept for testing, of which one shaft was weakened to get higher stresses in the sensing element. A series of test were conducted to measure the sensors response and sensitivity. The magnetoelastic material was tested before assembling the sensor, it showed a relatively linear dependency between stresses and magnetic field, within the tested range. The test result from the weakened shaft clearly shows the torque induced variations of the magnetic field. The proposed solution demonstrates the potential of making a compact sensor with few components with possibilities to be integrated in BorgWarner products.},
  author       = {Persson, Oskar and Persson, Gustav},
  keyword      = {Polarized band,Magnetoelastic,Torque sensor},
  language     = {eng},
  note         = {Student Paper},
  series       = {CODEN:LUTEDX/TEIE},
  title        = {Torque Sensor for Automotive Applications},
  year         = {2015},
}