Development of Non-contact Type Torque Sensor for Electric Power Steering Using Green Compact Core Component

摘要

In response to the recent requirement of improvement in performance for diversified controls and cost of non-contact type torque sensor for electric power steering, a green compact has been adopted as a new material along with a new processing method for the torque sensor. Consequently, torque sensitivity improved by approx. 30% and cost reduced by approx. 50% due to cutting down on material cost, processes and number of parts as compared to conventional torque sensors. A green compact is obtained by adding resin binder to a complex soft magnetic material made from insulating coating iron powders, carrying out molding, and subsequently heating (curing) the material, thereby melting the resin binder to solidify the material.