# A Sliding Mode Control with Nonlinear Fractional Order PID Sliding Surface for the Speed Operation of Surface‐Mounted PMSM Drives Based on an Extended State Observer

> Research article (Mathematical Problems in Engineering, 2019) · cited 27× · AI/ML

**Wikidata**: [openalex:W2973600919](https://www.wikidata.org/wiki/openalex:W2973600919)  
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