In order to implement the highefficiency velocity control of AC permanent magnet synchronous motors

a fractionalorder PD controller satisfying the system stability and robustness is proposed. Then

for the purpose of evaluating the performance of the controller

a comparison between the designed controller and the conventional optimal integerorder PI controller is made via simulations and prototype experiments. The results show that the designed fractionalorder PD controller outperforms the optimal integerorder PI controller in response speed and tracking performance

and energysaving efficiency.