Aiming at the problems of dynamic measurement of mechanical spindle torque in extreme environments

the exchange of electromagnetic induction principle

and a special ring-space array to encapsulate some magnetic balls and a magnetic-electric detector are used to compose a new type of non-contact torque sensor.The structure is designed and the measuring principle of the sensor is analyzed

the mathematical model of dynamic measurement for the sensor is established.By the movement of ring-space array cutting through the magnetic line of force

the magnetic flux is changed periodically.So the inducted signal changes periodically.Conversion from displacement signal to electrical signal is achieved

and the mathematic relationship between the phase difference and the torque of the shaft is established.The simulation experiment verified the correctness and feasibility of the methods.It can realize the dynamic torque measurement of the mechanical shaft.