Influence on the Torque Characteristics of a Non-Contact Electromagnetic Impact Device under High Rotation Speed and its Performance Improvement

Abstract

　We have proposed a non-contact electromagnetic impact-torque device (EMI device) using induced currents, and its characteristics have been verified using 3-D finite element method (FEM) analysis and carrying out measurements on a prototype. Our previous EMI device could not generate sufficient torques under high rotation speed due to the impedance of the coil. In order to solve this problem, the electric circuit in the EMI device has been improved by using an electrical resonant phenomenon. This paper describes the influence of the electrical resonant phenomenon on the impact torque characterstics.