[Objective] In practical applications

the speed of permanent magnet synchronous motor (PMSM) is susceptible to multi-source coupled disturbances

rendering traditional motor control inadequate for meeting the control requirements of PMSM in certain high-precision applications. Therefore

it is of great significance to study anti-disturbance control strategies for PMSM against periodic and aperiodic disturbances to suppress speed fluctuations and enhance the control accuracy of the motor system. [Methods] Addressing the speed fluctuation issue of permanent magnet synchronous motors under the influence of periodic and non-periodic disturbances

a speed fluctuation suppression strategy for PMSM based on active disturbance rejection repetitive controller was proposed to achieve speed fluctuation suppression. Firstly

the error-based active disturbance rejection controller (EBADRC) was improved by replacing the integrator in the extended state observer (ESO) with a low-pass filter to enhance its anti-disturbance capability. Secondly

a repetitive controller was used to improve the control law of EBADRC

thereby achieving suppression of periodic fluctuations caused by various disturbance frequencies. Finally

experimental comparisons were conducted on a prototype test platform between the control strategy proposed in this paper

EBADRC

improved EBADRC

and PI control. [Results] Under the conditions of sudden 50% and 100% load increases

the proposed control strategy was able to better suppress periodic and aperiodic disturbances. Under the condition of a sudden 100% load increase at rated speed of 2 000 r/min

the speed drop when using the proposed control method was reduced by 65

78

and 85 r/min compared to when using a PI controller

EBADRC

and improved EBADRC

respectively. The periodic speed fluctuations were reduced by 7

12

and 26 r/min

respectively. The steady-state speed test of the proposed method under b0 mismatch conditions showed that the PMSM still operated stably when the parameter b0 was doubled or halved

thus demonstrating the good parameter robustness of the proposed method. [Conclusion] The speed fluctuation suppression strategy for PMSM based on active disturbance rejection repetitive controller proposed in this paper can effectively suppress both periodic and aperiodic disturbances and exhibits good robustness.