High-quality China brushless PM motor factory, the main AC motor, DC motor, stepper motor welcome inquiry, to ensure the stability of delivery.The sliding mode variable structure control of brushless permanent magnet motor is a control strategy of variable structure control. The fundamental difference between it and conventional control lies in the discontinuity of control, that is, a switch characteristic that makes the system "structure" change at any time.The main characteristic of the system is to purposefully make the system move along the designed "sliding mode" trajectory according to the deviation and derivative of the modulated quantity.This sliding mode can be designed and is independent of the system parameters and disturbances, so the system has a strong robustness.In addition, the sliding mode variable structure control does not require any on-line identification, so it is easy to implement.In the past 10 years, the application of sliding mode variable structure control to AC drive has been a hot research topic for scholars at home and abroad, and some effective results have been obtained.But the chattering problem exists because of the discontinuous switching characteristic of sliding mode variable structure control.The main reasons are as follows: (1) For the actual sliding mode variable structure system, the control force is always limited, so that the acceleration of the system is limited;(2) the inertia of the system, the time-space lag of the switching switch and the error of state detection, especially for the sampling system of the computer, when the sampling time is long, the "quasi-sliding mode" is formed.Therefore, chattering must exist and cannot be eliminated in the real system, which limits its application.
