Magnetoelastic torque transducer nondestructive to the measured shaft

This paper describes a magnetoelastic torque transducer nondestructive to the measured shaft. A sensing sleeve added to the measured shaft can not only measure the torque of the rotating shaft, but also be nondestructive to the shaft. Moreover, the grid areas are cut on the sleeve, which enables the common coil structure to replace the classic multipolar structure, so that the dynamic error reduces by a factor of 10. Our prototype has been sued to detect the torque of oil rig.