Published 08/09/2021 at 460 × 162 in Analysis of high speed induction motor for spindle made by copper die casting process Fig. 2 Rotor model (bearing stiffness, left: 1e8N/m, right: 8e7N/m) Fig. 2 Rotor model (bearing stiffness, left: 1e8N/m, right: 8e7N/m)