Speed control of brushless DC motor based on super twisting sliding mode observer

DOI:	10.11809/bqzbgcxb2023.12.033
Keywords:	power supply respiratory protective device; brushless dc without position sensor; super twisting synovial membrane observer; magnetic field oriented control; double closed loop control
Abstract:	The brushless DC motor without position sensor is used as the power source of the powered air supply respiratory protection equipment, and the dynamic performance index of the powered air supply system with it as the core determines the safety and comfort of users. A Super Twisting based second order sliding mode observer is designed to suppress the jitter caused by the discontinuous phase in the first order sliding mode plane, as well as the phase lag and amplitude decay caused by the low pass filter. To improve the switching function of the sliding mode observer,the switching function of the observer is improved. The results show that the Super Twisting Sliding Mode Observer based control system effectively suppresses the system jitter, reduces the phase lag in rotor position estimation, and improves the accuracy of rotor position estimation. The dynamic performance indexes are better than those of the conventional sliding mode observer, which improves the system control performance and achieves the expected control effect of the air supply respiratory protection device.
Issue:	Vol. 44 No. 12 (2023)
Published:	2023-12-28
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