Design refinements and experimental test of hybrid excitation motor for main spindle drive in machine tools

This paper reports design refinements to make a trial manufacturing of hybrid excitation motor (HEM) for high speed spindle drive in machine tools. The proposed HEM is intentionally designed using 3D-FEA for the target application taking into account of practical design constraints. In accordance with the redesigned specifications, a test machine with 4-pole HEM is manufactured and tested. Some experimental results using test machine are demonstrated that the proposed machine achieves field strengthening and weakening control according to its working principle.