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

<div>(a) Response curves of the traditional sliding surface. (b) Response curves of the FOPID sliding surface and the proposed NFOPID sliding surface.</div>

Mathematical Problems in Engineering

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Figure 5

Figure 5: 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 

Figure 5 | 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 