Development of a Non-Contact Torque Transducer for Electric Power Steering Systems 920707
Need for non-contact torque transducers in modern power steering systems is identified. Inherent size and complexity of existing transducer designs is shown to discourage their use in this application. A new magnetoelastic type of transducer of unusually small and simple construction is described. The transducing function is fulfilled by just two elements: a circumferentially magnetized ring affixed at a convenient location on any shaft in the torque path between the steering wheel and the steering box, and a magnetic field sensor mounted in proximity to the ring. Stresses in the ring, associated with the torque transmitted along the shaft, cause the ring magnetization to develop an axial component. The resulting magnetic field in the space around the ring has a polarity and intensity correlated with the sense and magnitude of the torque. The typically solid state, e.g., Hall effect, field sensor generates an analogous electrical signal which is electronically amplified and offset to desired level and format. Future development includes combining all sensing/signal conditioning into a single, monolithic, integrated circuit.
Citation: Garshelis, I., Whitney, K., and May, L., "Development of a Non-Contact Torque Transducer for Electric Power Steering Systems," SAE Technical Paper 920707, 1992, https://doi.org/10.4271/920707. Download Citation
Author(s):
Ivan J. Garshelis, Kristin Whitney, Lutz May
Affiliated:
Analog Devices, Inc.
Pages: 12
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Sensors and Actuators 1992-SP-0903, SAE 1992 Transactions: Journal of Passenger Cars-V101-6
Related Topics:
Power steering
Steering systems
Electric power
Wheels
Magnetic materials
Sensors and actuators
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »