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Studies Review for TorqueMeasurement on Electric Actuator JianfangMao*,Qunli Shang*, Shanen Yu *Institute of Information & Control, Hangzhou Dianzi University, Hangzhou 更多：https://www.bmcx.com/ , China E-mail: mjfmayhappy@126.com Keywords: electric actuator; output torque; direct measurement; indirect measurement; torque sensor Abstract The necessity and importance of torque measurement on electric actuator is introduced in this paper. From the view of torque protection, the paper emphasizes on several methods for output torque measurement on electric actuator, and then analyzes the advantages and disadvantages of these methods. Through the description of these various of measurement methods, we can understand the importance of torque measurement on electric actuator deeply, and find that it is significant for us to research more advanced and valid torque measurement methods on electric actuator in future.