T7 series torque sensor is a typical structure of non-contact torque sensor, the output signal of non contact mode, the high frequency part of the signal is filtered by the detection circuit, only the torque signal is amplified. Non contact torque sensor due to the use of the non contact work, and long service life, high reliability, less susceptible to wear, less delay, deflection and axial offset axis impact smaller, now has been widely used in cars and light vehicles, is the mainstream product of EPS sensor.