The torque ancd rotational speed of a motor are the most important two parameters

their measurement must be accurate.According to the requirements to the measurement aviation motor by the user

this paper analyzes the measurement principles of torque and rotational speed

and points out that the measuring apparatus composed of optoelectric sensors is more suitable for measuring heavy torque and high rotational speed. Through analysis the reasons influencing measuring stability have been found out

which are the flexure strain and structure resonance produced by the transmission axle under the function of the gearing-in force of the reduction gear.This paper

through accurate calculation

takes account of the effects of the mechanical structure on the measuring stability and gives the basic principles and method of choosing the torque sensor and rotational speed sensor.Besides

the measuring accuracy of the apparatus has been considerably increased

the size made smaller

and weight lost

so that they are fit for a viation use.