Nonlinearity of Magnetostrictive Torque Sensor under Varying External Magnetic Field Strength

Abstract Correctly torquing bone screws is an important factor in achieving positive patient outcomes during orthopaedic surgery. A torque-limiting smart screwdriver concept has been proposed, and ongoing work being undertaken to model the screwing process allow work. These models require experimental validation, so a test rig was developed. The magnetostrictive torque sensor this affected by magnetic parts of rig, which offset zero-torque point; raised concerns over effects on linearity, were tested here. against non-magnetostrictive reference under varying external conditions. While field torque, there no notable change linearity conditions tested, always within datasheet specifications. Hence, we conclude that context negative although higher loading or stronger conditions, may not hold.