Ultralocal Model-Free Logarithmic Sliding-Mode Control for PMSM Angle Robust Tracking With Asymmetric Constraints. - Zheng Liu 025; Hanlin Dong; Qianbao Mi; Zhiqiang Ma 001; Zhaoke Ning; Xudong Wang 008 (IEEE Trans. Circuits Syst. I Regul. Pap., 2026)