Patent ID: 6966232
Filing Date: 2005-11-22
Classification: G01L

Abstract:
1. A torque sensor, comprising: a magnetic metal film with magnetic anisotropy attached to a torque transmission shaft; an exciting coil and a detector coil each installed near the magnetic metal film; an excitation power supply source that generates an excitation power having a voltage (Vcc); an ac excitation signal generator ( a reference voltage generator that is connected to the excitation power supply source to input the excitation power having the voltage (Vcc) and generates a reference voltage (Vref), indicating a midpoint of the ac excitation signal (Vsin), that is set to a voltage corresponding to a 50% duty ratio of the excitation power having the voltage (Vcc); and a torque detector that is connected to the detector coil and detects a torque applied to the torque transmission shaft based on an output of the detector coil when the torque is applied.