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 under three control strategies for a square wave signal input. (b) Response error curves under three control strategies for a square wave signal input.</div>

Mathematical Problems in Engineering

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Figure 7

Figure 7: 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 7 | 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 