Clarify force
A. Khamitov, N. P. Petersen and E. L. Severson, "Combined Windings for Bearingless Motors—An Overview," 2023 IEEE Energy Conversion Congress and Exposition (ECCE), Nashville, TN, USA, 2023, pp. 4628-4635, doi: 10.1109/ECCE53617.2023.10362696.