Method for manufacturing magnetostrictive torque sensor device, and electric power steering apparatus

摘要

A method for manufacturing a magnetostrictive torque sensor device includes the steps of: providing a steering shaft (12b) or another such rotating shaft with two magnetostrictive parts (20u, 20d) endowed with magnetic anisotropy; disposing detection coils (20r, 20r', 20s, 20s') around the magnetostrictive parts to detect changes in magnetostrictive characteristics of the magnetostrictive parts; providing a detection circuit (20x) for bringing out detection signals from signals outputted from the detection coils; and adjusting a gain of a gain adjuster included in the detection circuit.