Analysis of magnetic-coupling effect on the performances of 2DoF direct-drive induction motors

摘要

The coupling between the rotary and linear magnetic fields is a special feature of two-degrees-of-freedom (2DoF) motors. The magnetic-coupling effect on the performances of 2DoF direct-drive induction motors (2DoF-DDIMs) is exposed and investigated based on 3D finite-element analysis and experiments on a prototyped motor. The performances of the 2DoF-DDIM are analysed under the conditions of with and without coupling. Further, the speed coupling coefficient is introduced and calculated to consider the effect of the magnetic-coupling effect on speed. The magnetic-coupling effect of 2DoF-DDIM, which leads to induced voltages and currents under rotary or linear motion and lower speed and higher fluctuations under helical motion, enhances with an increase in the source frequency and rotary speed. This research on the magnetic-coupling effect of 2DoF-DDIM will provide a significant reference for characteristic research and precise control of 2DoF-DDIM.