Objective To meet the demands for high-performance drive and high control accuracy in permanent magnet synchronous motors PMSMs and to address their susceptibility to external disturbances in complex environments a fast super-twisting algorithm controller incorporating an adaptive conditional disturbance negation ACDN is designed. This controller aims to enhance the response speed and control accuracy of the motor across various operating conditions. Methods Based on the analysis of the classical super-twisting algorithm in which the discontinuity of the sign function leads to chattering the hyperbolic tangent function was used to replace the sign function and the introduced linear term was replaced with an adaptive function. As a result an improved fast super-twisting algorithm controller was obtained. Secondly a state observer was designed with acceleration as the extended state. Integrated with the improved algorithm this observer enhanced the accuracy and speed of lumped disturbance estimation. The estimated lumped disturbance was then used as the input part of the adaptive conditional disturbance suppression regulator. The purpose of the regulator was to distinguish the existing disturbances suppress the unfavorable ones utilize the favorable ones and finally output the ideal q-axis current component. Results Simulation experimental results showed that under the same working condition the time for the improved controller to reach the steady state was about one-tenth of that of the traditional proportionalintegral control and the traditional sliding mode control and there was no overshoot. When a load of 5 N·m was suddenly applied all three control strategies caused a speed drop. However the improved controller achieved a speed decrease of only 5 r/ min which outperformed the other two strategies. In a comparative experiment with and without the ACDN module under a 10 N·m load the recovery time with ACDN was approximately one-twentieth of that without ACDN. Conclusion Simulation experimental data prove that when there are disturbances the system equipped with an adaptive conditional disturbance suppression regulator is less affected and has more advantages in terms of the time required to restore the steady state. This method effectively improves the response speed and anti-interference ability of the system which reflects the superiority of the fast super-twisting algorithm controller and the adaptive conditional disturbance suppression regulator.