Abstract: Torque detection is an important part of the electric actuator. There is a certain corresponding relationship between the electric actuator output torque and the motor current, and therefore, this paper puts forward an engineering method of indirectly measuring the output torque, namely indirectly measuring the output torque by measuring the effective value of the electric actuator output current. Computing the current effective value by fast Fourier transform, compared with the current effective value measured by the current detector, experimental results show that the calculation of current effective value of the electric actuator by fast Fourier transform can be used as an effective method of indirectly measuring the output torque.

Key words: electric actuator, torque measurement, current effective value, fast Fourier transform